JPS63503017A - Magnetically controlled scanning magnetic head tracking control system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention generally provides that a signal conversion area defined by a transducer is attached to a magnetic recording medium. magnetic field controlled to accurately track a selected path along The present invention relates to magnetic recording and reproduction using a magnetic signal converter.

More particularly, the present invention provides a selectable transducer gap defined by a magnetic transducer. The functional segment forms a transducing area for transferring information signals with respect to the magnetic recording medium. of the selected segment for the selected path along the magnetic recording medium. Relates to magnetic recording and reproduction in which the position is now magnetically controlled.

Transferring information signals through recording or playback operations performed in conjunction with magnetic recording media This is done by using the interaction between the magnetic transducer and the recording medium during relative motion between them. Ru.

In order to achieve optimal transfer of information signals during such operations, faithful recording of the signals and and regeneration is required. This is along the recording medium on which the information signal is recorded or reproduced. It is very important to maintain proper alignment between the track and the transducer.

Many factors can lead to loss of proper matching. Generally, such alignment The loss may be caused by recording media movement/positional instability, magnetic transducer movement and/or positional instability. mechanical-to-mechanical physical changes made to magnetic recording media by different recording devices. Due to some instabilities that affect the performance of recording/playback equipment, arises from Loss of proper alignment between the magnetic transducer and the magnetic recording medium may cause the transducer to incomplete tracking of the desired path along the medium (mistracking) due to It appears. During playback operations, mistracking occurs either in amplitude or in time. or both, causing considerable deterioration in the quality of the reproduced signal. Furthermore, regarding recording media, The higher the frequency of the information signals to be transmitted in succession, the more likely the signal will deteriorate. The extent of this is large, and therefore the need to avoid the above-mentioned instability is even more important. .

Instabilities that result in false tracking can take various forms of imperfection. For example, information Imperfections in the recording medium movement or position relative to the transducer of the track direction of the issue This causes signal time axis errors. Similarly, the time base error is the track error of the information signal. Arising from imperfections in the motion or position of the magnetic transducer in direction. Recording medium and rotation Variations in converter speed are an example of imperfections that result in signal timebase errors. Furthermore, information signals Relative transducer vs. recording medium movement or position imperfections across the track being transferred causes signal amplitude errors and even signal loss. Inappropriate tape recording media information and Tape and tape slip errors are examples of imperfections that result in signal amplitude errors.

In rotary segmented scan magnetic tape recording and/or playback equipment, this It has the least instability.

In such devices, a rotating magnetic transducer moves the magnetic tape at an angle to the length of the tape. recording and reproducing information signals on parallel tracks extending laterally to the loop. Ru. Rotary scanning devices that are most susceptible to instabilities that cause false tracking are rotary scanning devices. is a linearly scanned tape device, and any imperfections in the tape or rotating transducer speed are directly accounted for. Then move on to time axis error. Furthermore, in early helical scan tape machines, , an attempt to reproduce information signals recorded at different tape speeds versus normal relative converters. This was achieved by comprehensive error tracking by transducers in the form of track crossings.

In helical scan tape equipment for television signals, this cross-track King is the appearance of visually disturbing noise bars in the displayed video image. Ru.

Such helical scan tape devices operate at normal relative transducer-to-tape speeds. Error tracking can cause disruptive degradation of the information signal even when Usually occurs. Such devices rely on relatively long tracks over which information signals are transferred. It can be characterized as. This includes transducers and tracks along the entire tape track. Even slight machine-to-machine physical changes that prevented proper alignment between the A chiru helical scanning tape device records records made on magnetic tape by different devices. A mechanism that can cause disruptive error tracking when used for playback. This results in large variations in the characteristic transducer tracking trajectory from machine to machine.

magnetically so that the information signal is optimally transferred with respect to one track along the recording medium Various techniques have been developed to maintain proper alignment between the magnetic transducer and the magnetic recording medium. has been done. In these technologies, (1) many magnetic transducers are one transducer; (2) a movable recording medium guide; the id is positionally adjusted to move the magnetic recording medium relative to the magnetic transducer; 3) In a rotating segmented coprototic tape device, a movable rotating plate supporting a rotating transducer is used. The tape guide portion is axially oriented to control the position of the transducer with respect to the tape recording medium. (4) In a rotating helical scanning chip device, the transducer is It is attached to a rotatable member for movement relative to the recording medium.

According to one such technique, a tracking reference signal is applied to a tape recording medium. given along the tape to identify the start of each laterally extending track. available. These signals are sent to a power mechanism to compensate for erroneous ranking conditions. For use by the transducer to identify the start of each scan of the cytrac be sensed.

This compensation is used to adjust the magnetic tape position with respect to the tracking transducer. This is achieved by controlling the capstan drive motor. This kind of method It is possible to position the transducer correctly relative to the track at the beginning of the track scan. Wear. However, if the track is not perfectly straight or there is a foreseeable If it does not follow the path, the transducer will find its optimal translating position as it scans the tape. I will be left behind. As a result, such a scheme provides optimal variation across the scan. The tracking compensation is performed to compensate for the maintenance of the track position. For applications such as rotating helical scanning tape systems, where It's not appropriate to be there.

In some of these recording media transport control systems, the media remote from the information signal is Control track information signals recorded along the track maintain proper tracking by the transducer. It is reproduced to obtain a control signal for adjusting the tension of the recording medium so as to maintain the tension of the recording medium. this In other recording medium feed control methods, information signals reproduced from the recording medium are The number of recording media feed adjustments is made to maintain proper tracking by the transducer. and is monitored to provide control signals.

If you change the feeding speed of the recording medium, you can play from the recorded track in the feeding direction of the recording medium. Undesirable tensions arise that change the time axis of the generated information signal. Furthermore, the converter Techniques that rely on controlling the advance of the recording medium to maintain proper tracking by The technique is such that large excursions in transducer/recording medium position maintain proper tracking by the transducer. changes to the path along the recording medium, especially required at high speeds to maintain This is not preferred for accurate control of the exchanger position.

to optimally position the magnetic transducer with respect to one track along the recording medium. In one method based on moving it to the The transducer is positioned over the track before reproducing the recorded signal. This is that A transducer structure consisting of two magnetic elements, each formed by a separate magnetic body part. Achieved through construction. This multi-element converter has equal signals on each of the converters. is moved until it is reproduced by the element. With the occurrence of this condition, the converter Properly positioned and this transducer positioner allows normal playback of the recorded signal. control is withdrawn so that it can function properly. Using control track and playback head vibration, etc. method is used for tracking purposes. However, until recently , none of these moving transducer positioning methods is particularly effective over long track lengths. However, it is not possible to maintain sufficient alignment between the tracks and transducers along the recording medium. I couldn't come. 4! ! FIC, such a system is a system in which track segments are recorded on tape. A magnetic tape is transmitting a continuous signal in terms of a series of discrete track segments along a loop. It is not suitable for.

Recently, advances have been made to allow movement of rotary transducers across the width dimension of the recording track. Modified to maintain proper alignment between the transducer and recording tracks when transmitting information signals. A rotating segment using a rotating magnetic transducer attached to a rotating member by a replaceable member. Digitally scanned magnetic tape recording and/or playback equipment is used. The most common structure composition is the transfer of information signals on recording tracks that run diagonally along the length of the tape. A rotating cylindrical tape guides the magnetic tape along its length along a helical path. A piezoelectric member is supported in a cantilevered manner by the guide. The magnetic transducer is piezoelectric Supported at the free end opposite the cantilevered end of the member, the piezoelectric member is positioned at the transducer. is perpendicular to the plane of rotation (the direction is also along the length of the recording track) mounted on a rotating guide so that it can be moved in a direction (also perpendicular to can be attached. a tracking control signal is provided to the cantilevered piezoelectric member; by modifying it and moving a magnetic transducer supported by it so that it becomes an information signal. is maintained in alignment with the recording track being transferred. tracking error A servo mechanism is used to detect the For use in applications such as Conversion even when the tape is being fed in the opposite direction to the normal tape feed direction This makes it possible to maintain device-to-recording track alignment.

Such devices were a poor choice for early attempts to control transducer-to-recording track alignment. However, the device still shows some improvement, especially under certain operating conditions. It is characterized by transducer-to-recording track instability.

For example, deflectable parts supporting transducers used in such devices The material is a mechanical device and is therefore subject to dynamic parameters that are inherently non-linear. %marked. Furthermore, as transducer support devices, they can withstand large external forces. Easy to accept. Some of them essentially receive it. Significant errors from the non-linear nature of the deflectable member and the external forces experienced Complex servomechanisms and deflectable member construction to minimize tracking is usually used.

Even with these precautions, significant tracking errors are often observed, especially in cantilevered structures. This occurs in devices that use a piezoelectric member that is simple cantilever A supported deflectable member whose free end traces a pure segment of a circle deflect or bend so that For this reason, the transducer is rigidly mounted on the free end. traces a considerable path and its position (distance) with respect to the surface of the magnetic recording medium and the facing angle).

This false tracking occurs when the cantilevered deflectable member This is particularly problematic when deflected by the maximum amount from the deflected position. its maximum odor However, due to the large spacing between the transducer and the recording medium, a signal called Zenith error occurs. This will result in a large loss in transmission. During playback, such spacing errors or space errors may occur. - Shining loss gives a reduction in the amplitude of the reproduced signal. This playback interval loss effect is caused by the signal wave Depends on length. In other words, at short signal wavelengths, the reduction in the amplitude of the reproduced signal becomes more pronounced. Ru.

As is clear from the above, all conventional magnetic transducers versus magnetic recording media King control techniques introduce mechanical biases that may reduce error tracking to some extent. It depends in some way on the use and control of the direction. However, traditional tracking systems Even the best of your art does not reduce racking (all errors). Broadcaster For commercial television signals, such tracking errors may be minimal. is also the most serious cause of interference with the displayed television signal. Become. In other fields, some loss of information signals is not particularly harmful and is therefore Inaccurate tracking is acceptable, but it can't be ignored. However, the information signal Full recovery of It is useful in any application involving the transfer of information signals between magnetic recording media and magnetic recording media. subordinate Therefore, information signals can be transferred between a magnetic transducer and a magnetic recording medium without relying on mechanical deflection. Tracking of the magnetic transducer regarding the magnetic recording medium can be controlled during transfer. preferable.

According to the invention, such control is related to (1) tracks along the recording medium; The conversion area (i.e. (2) one magnetic transducer with a larger gap size; A controller that enables selected segments to carry out the transfer of information signals. This is achieved by a combination of This controller is used to perform information signal transfer. In response to a control signal that determines the segment within the selected expanded gap dimension, the selected Activation of selected segments is based on the selected segment and recording medium. is moved within the enlarged gap dimension to maintain alignment between the Ru. The clarification and selection of this activated segment takes into account the transformation area segment. magnetically unsaturated to enable the transfer of information signals on the recording medium. selectively and magnetically areas of the body of the transducer's magnetic material, leaving behind areas where This is achieved by saturation. To achieve this a magnetic transducer like this A preferred form of is described in the inventor's pending patent application. but However, for the purposes of the present invention, relative transducer-to-recording medium tracking is controlled. such a suitable magnetic transducer so that optimum transfer occurs with respect to the recording medium when must be arranged with respect to the magnetic recording medium in a specific manner. In more detail , the length dimension of the gap is traced along the recording medium by the selected segment. The transducer is oriented generally in a direction corresponding to the direction of the path through which the recording medium is Supported in relation to the body. This generally corresponds to the width of the path being traced The width dimension of the gap is positioned in an orientation state that is a direction. This orientation of the gap state, the selected segment has an enlarged gap dimension (this is useful for applications such as is the width of the gap). It has the advantage of not introducing instability in the time axis to the information signal. Ru.

of selected segments for tracks, especially continuously and during the transfer of information signals To control the position of the segment within the enlarged gap dimension when a variation is sensed. by the relative positioning of magnetically saturated and unsaturated regions within the magnetic transducer. Controls the placement of selected segments within the expanded gap dimensions that are determined. It is only necessary that the controller be configured to This control is for recording media. Control of mechanical changes in magnetic transducers to control the placement of selected segments need not be related to. Modification of the path traced in relation to the recording medium Movement of the selected segment within the enlarged gap that causes The relative deviation of magnetically saturated and unsaturated regions within a magnetic transducer with respect to the recording medium or requires only movement. For this reason, the transducer-to-recording medium tracking according to the present invention control is achieved without having to rely on mechanical changes. As a result, the present invention Tracking control is conventionally used in magnetic recording and/or reproducing devices. tracks along the recording medium without the negative effects that characterize conventional tracking control technologies. This allows for proper matching between the rack and transducer to be maintained.

Other features and advantages of the invention can be found in conjunction with the accompanying drawings, which illustrate preferred embodiments of the invention and the patent claims. This will become clearer if we consider the scope of the request.

FIG. 1 is a schematic block diagram of a magnetic recording and/or reproducing apparatus according to the present invention.

Figure 2 shows one implementation of a magnetic transducer with a magnetically movable transducer area within the transducer. It is a schematic perspective view of an example.

FIG. 3 shows a magnetic transducer having a transducer area movable within the transducer according to the invention. FIG. 2 is a schematic perspective view showing the operating principle of the embodiment.

FIG. 4 is a front view of the converter of FIG. 3.

FIG. 5 shows the electromagnetic in the transducer according to the operating principle illustrated by the embodiment of FIG. 1 is a simplified perspective view of a magnetic transducer with a transducing area that is movable; FIG.

FIG. 6 is a more detailed diagram of the transducer shown in FIG.

FIG. 7 is an enlarged perspective view of the saturable wedge portion of the transducer of FIG. It is a diagram.

FIG. 8 is an example of magnetic flux density versus magnetic permeability characteristics of known magnetic materials.

Figure 9 shows the saturable transducer of Figure 6 rotated by 90° and oriented in the opposite direction. FIG. 3 is a front view of the wedge-shaped portion.

FIG. 10 shows each of FIG. 8 corresponding to one saturable wedge-shaped portion of FIG. 9. Figure 2 shows two superimposed magnetic flux density versus permeability characteristics.

Figure 11 is used to control the width and position of the transducer area of the transducer of Figure 6. FIG. 3 is a diagram of a saturation control circuit.

FIG. 12 shows the control voltage vs. control current characteristics obtained by the circuit of FIG. 11.

Figure 13 shows an omega-wound rotating helical scan tape recording diagram simplified for clarity. A perspective view of the tape guide drum and transducer assembly portion of the playback and/or playback device. Ru.

Figure 14 shows the tape guide drum of Figure 1 partially removed and partially shown in cross section. and a side view of the transducer assembly.

Figure 15 is an enlarged segment of a magnetic tape showing tracks of recorded information signals. It is

Figure 16 shows tracking control for a rotating helical scan tape recording and playback device. FIG. 2 is a block diagram showing a circuit.

Figure 17 shows tracking control for a rotating helical scan tape recording and playback device. FIG. 3 is a block diagram showing another example of the circuit.

Figures 18A, 18B and 180 show that within a transducer structure in accordance with a preferred embodiment of the present invention. Various perspective views of a magnetic transducer structure with a plurality of transducer zones that are electromagnetically movable It is a diagram.

FIG. 19 shows the tracking diagram of FIG. 17 which corrects for tracking geometric or physical errors. 1 is a block diagram illustrating a partial embodiment of a locking control circuit.

Figure 20 shows the control applied to the magnetic transducer to cause electromagnetic movement of the transducer zone. FIG. 3 is an illustration of various tracking geometric waveforms of current;

Figure 21 shows a modification that allows information signals to be transferred between a transducer and a magnetic recording medium. a transducer having an associated magnetically permeable or permeable body in which an exchange area is created; A simplified example of another embodiment of a magnetic transducer having a transducing area that is electromagnetically movable within the It is an enlarged perspective view.

FIG. 22 is a simplified enlargement of another embodiment of a magnetic transducer of the type shown in FIG. FIG.

Figures 23A, 25B, 23C and 23D are tracks of the transducer embodiment of Figure 22. Indicates profile characteristics.

FIG. 24 is a simplified perspective view of another embodiment of a magnetic transducer of the type shown in FIG. It is a diagram.

FIG. 25 is a front view of the magnetic transducer shown in FIG. 24.

In the following description of embodiments of the invention, similar elements are designated by similar reference numerals. and similar elements and circuit portions will be described in subsequent sections in conjunction with various embodiments of the invention. (Not repeated for examples.

Broadly speaking, the present invention describes a segment of a transducing gap defined by a magnetic transducer. is selectively activated and deflectable along the gap so that the information signal is selected. The selected path along the recording medium as it is transferred by the transducer magnetic recording medium such that alignment is maintained between the path and selected activated segments. TECHNICAL FIELD The present invention relates to a method and apparatus for transmitting information signals in connection with the invention. This method and apparatus depending on the desired selected path or trajectory of the recording track on the recording medium. It can take the form of The recording track trajectory (i.e. format) can be divided into four types. Divided into general classifications. They are: (1) the main dimension usually measured by the length of the recording medium; (2) usually a track extending lengthwise along a recording medium, typically a plate a track extending along a circular path of a spiral or a set of concentric circles, which are sides ( 3) along an arcuate path across the principal dimension, which is usually the medium dimension of the recording medium; an elongated track (4) transverse to its principal dimension, which is usually the length of the recording medium; A track segment that extends along a substantially straight path. This truck four The mat contains the necessary transducer pairs where the information signal is transferred between the transducer and the recording medium. Determine the media geometric interface. Then, this geometric interface The face determines the characteristics of the required relative motion between the transducer and the recording medium, and thus Determine the characteristics of the recording medium handling device and the transducer handling device. The method of the present invention and and equipment for transmitting information signals in relation to any track format. While providing the above advantages, in particular the fourth article of the track format mentioned above When the conditions are met, many of the recording and reproducing defects or characteristics of the rotating magnetic transducer are corrected. It has the advantage of

Generally and with respect to FIG. 1, information relating to magnetic recording medium 42 according to the present invention A scheme 100 for transmitting information signals includes a location 106 at which the transmission of information signals takes place. The magnetic transducer 20 includes a magnetic transducer 20 arranged for magnetic coupling with a recording medium 42 . conversion Relative movement between the device 20 and the recording medium 42 is controlled by preferred means 108, typically Setting by the recording medium feed controller 110 and the converter controller 112 cooperating therewith. be done. The characteristics of each of these controls determine the desired recording track format. Depends on. Converter for things like segmented track formats 20 and the recording medium 42, while the longitudinal trackform For formats such as mats, movement of only the recording medium 42 is usually required. Ru.

An apparatus in which both the transducer 20 and the recording medium 42 are moved during normal signal transfer. For each controller, the respective controllers are configured to monitor the mobile object at the information signal transfer location 106. A drive signal to an operatively associated feed mechanism 114 or 116 that sets the desired movement. is configured to give. For example, rotating segmented scanning magnetic tape recording and and/or in a playback device, the advance mechanism 114 may include a pair of tape storage reels 118. and 120, between which the tape recording medium 42 is controlled by the transport controller 110. The tape is moved under the control of a tape feed motion signal provided by the tape controller. This drive signal The information signal is transferred between tape 42 and information signal processor 122 by converter 20. determine the speed and direction at which it is moved through the transfer location 106 as it is transferred; . More commonly, such devices include a rotatable transducer 9 housing 116, which This supports the transducer 20 at high speed with respect to the tape 42 being fed. A conversion area 56 defined by the length of the tape is provided at the signal transfer location 106. The desired path 126 is traced transversely to the direction. (Tea 42, the conversion zone 56, and the desired laterally extending passageway 126. For ease of reference, conversion area 56 and passageway 126 are shown in dotted lines on the tape media. ). In the case of feeding the tape 42, the rotatable transducer 9 housing 116 is a transducer. Determining the rotation speed and direction of rotation of 20 and thus the movement of the conversion area 56 relative to the tape. is driven under the control of a drive signal provided by a rotary transducer controller 112 that Ru.

Typically, the relative movement between the recording medium 42 and the conversion area 56 is controlled by the movement within the signal transfer location 106. adjusted against dynamic disturbances.

This adjustment is made to maintain the desired relative motion within the transfer or transformation location. This is realized by a servo mechanism that follows more than one command signal. Often this adjustment is done in a closed loop. This is achieved by the transfer area 56 and recording medium 42 at the transfer location 106. The actual state of the controlled variable, which is a relative motion, is measured and the corresponding signal is commanded That is, it is fed back for comparison with a desired state (condition). This comparison is used to produce a signal proportional to the difference between the commanded and commanded conditions, which to the motion generating means 108 in such a manner as to correct deviations of the actual motion conditions from the conditions. Used to change the relative motion that determines the drive applied.

In devices of the type generally described in connection with FIG. Mutual (bidirectional) communication is provided between controllers 110 and 112 via links 128 and 130. This is accomplished by providing a command drive signal to the recording medium transport mechanism 1. 14 and the conversion consignment 9 habitat 116 and the measured state or condition of relative motion. A feedback signal representative of the condition is thereby returned to controllers 110 and 112. . These controllers are connected to the system controller via a system control bidirectional communication link 134. In response to received feedback signals and command signals provided by IS 2 to compensate for the deviation of the actual relative motion state from the commanded state represented by the command signal. Correct.

In a rotary segmented scan magnetic tape recording and/or playback device, the tape Maintaining accurate alignment between the desired path 126 along 42 and the transducer 56 Accurate synchronous control of relative position and motion measures is also required. Such controls are usually , feedback control signal information provided from recording along recording medium 42 and from a tachometer operatively associated with recording medium 42 and rotational transducer 20. This is accomplished through the use of position and velocity feedback information. For details, please refer to the Tracks 136 of control information are typically tracks or channels extending laterally along the tape. a tape recording medium that identifies the position of the track 126 and passes through the signal transfer location 106; is recorded along the tape 42 to provide measurements of the speed and direction of the feed.

This information is transferred to the tape by suitable means as determined by the control criteria. Begin tracing the passage laterally along the tape at the appropriate location along , the 200 rotations of the transducer and the advance of the tape 42 associated with the transfer location 106 are the same. is reproduced by control track converter 138 for the purpose of faster tape Speed and tape direction feedback information is provided to the tape passing through the signal transfer location 106. A tape tachometer 14 engages the tape 42 in response to the speed and direction of movement. given by 0. The rotational position of rotational transducer 20 is determined by a tacho coupled to the rotational transducer. The conversion zone along the rotation path determined from the meter 142 and relative to the transfer location 106 A signal representing 56 angular positions is provided. Ordinary used with rotary transducer The tachometer is configured such that the transducer section 56 is located at a known, predetermined angle of its rotational path. Provides a one-turn tachometer signal to identify when passing a degree position.

Furthermore, these tachometers give a feedback signal, which then determines the rotational speed of the transducer. degree is determined. Synchronization of the tape position and the conversion area position at conversion location 106 is Movement feedback information and control input 1 provided on feed links 128 and 130 44 to the system controller 152 in response to operator control inputs provided at 44. This is achieved by comparison logic contained within the motion generating means 108 that receives commanded position information. will be accomplished.

Control of the relative feed rates of tape 42 and rotary transducer 20 is provided by a tachometer. The system operates according to the speed information provided by the user and the operator control input provided by the control human power 144. This is accomplished by comparison with the speed command received from stem controller 132. general Generally, the rotational speed of transducer 20 is determined by a tachometer provided by tachometer 142. Tachometer speed information from the signal and transducer circuits provided to system controller 132 This is done by comparing with the rotation speed command. Appropriate ratios included in converter controller 112 The comparison logic applies rotational drive to the converting transport 9 housing 116 according to these inputs to obtain the desired order. The rotational speed of the converter 20 is maintained at the command speed. Similarly, the feed controller 110 includes The comparison logic is based on the tape feed rate command input provided by system controller 132. to compare the force with the tachometer speed signal provided by tape tachometer 140. act to maintain the transport speed of tape 42 at the desired commanded speed determined by Ku. The deviation in the feed speed of the tape 42 is adjusted so that the tape feed speed matches the commanded speed. A feed controller 1 that adjusts the drive given to the tape feeder @ 114 in order to Corrected by 10.

In the embodiments described above, the relative movement between the transducer 20 and the recording medium 42 is the desired distance along the recording medium as the signal is transferred between the recording medium 42 and the transducer 20; is controlled to maintain alignment between the passageway 126 and the conversion zone 56. for example, During a recording operation, an information signal provided from an external signal source 146 is sent to the information signal processor 1. 22 to obtain the appropriate channel code, and then the recording medium 42 by communication link 129 to converter 20 for recording. reproduction In operation, the recorded information signal is reproduced from the recording medium by the converter and converted into an external signal. A communications link is provided to process the channel codes required by the using device 146. 129 to the information signal processor 122. The faithful transmission of information signals is , the feed mechanism 114 and and relative motion instability that exceeds the capabilities of the position and velocity servomechanisms associated with and 116. The arrangement described above does not result in a loss of alignment of the conversion area to the desired path as a result of the occurrence of This will be done depending on the location. However, such a servo mechanism Mechanical deviations of recording medium 42 and/or rotational transducer 20 may be used to effect such corrections. depending on the use and control of the position. As generally mentioned above, such tracking It is not possible to reduce all interference error tracking using tracking control techniques.

According to one particular feature of the invention, transducer-to-recording medium tracking control is achieved. Reliance on the control of mechanical changes such that the desired path 1 along the recording medium 42 magnetic transducer 20 allowing magnetic control of the positioning of the transducing area 56 relative to 26; Avoided by using . More specifically, with reference to FIG. The tangent that determines the conversion gap 26 of the selected width W dimension while obtaining the specified length. Magnetically permeable material comprising magnetic core portions 21 and 22 with magnetic poles 27, 28 It is equipped with a material body 202. The width W is larger than the desired width W3 of the conversion area 56. along the gap 26 for controlled transducer-to-recording tracking tracking. A magnetically controlled movement of the transducing area is possible. More details below As shown, this controlled movement affects selected segments or areas 5 of the gap. 6 can transfer information signals between the recording medium 42 and the conversion signal winding 25. Selective magnetic saturation of one region within body 202 of magnetically permeable material to It is done in harmony. The conversion winding window 24 accommodates the winding 25); This allows the information signal to intersect with a supportable magnetic flux, thereby converting the information signal into an electrical signal as well. is provided within the body portion 202 so that it is converted to its inverse.

A transducer gap 26 is formed between the abutting surfaces of the magnetic poles 27 and 28 in a manner known in the art. of a non-magnetic material such as silicon dioxide or glass Defined by spacers. An electrical signal representing the desired information is e.g. 129 (FIG. 1) to the converter winding 25 from the signal source applied to the winding. When recording such information on a magnetic storage medium such as tape 42, one magnetic field is Formed within the transducer body are represented by magnetic flux lines 16 containing information. child is activated within the transducer gap 26 in the form of an emitted magnetic flux that engages the tape 42. It is emitted from the face of the core portion proximate to the conversion zone 561. tape is second Shown as transparent in the figure, representing the portion 41 of the transducer 20 that abuts the tape. This part will be referred to as the surface 41 below. This side of the transducer body is typical in close enough proximity with the medium 42 to magnetically interact with the medium 42 under operating conditions; Most of the interaction is in the direction of relative motion between transducer 20 and recording medium 42. occurs at the edge of the core portion adjacent to the gap 26 on the downstream side of the gap. Ru. In this example, this surface is rectangular in shape, but other shapes may be the same or different. Effective under certain conditions. Additionally, the boundary of surface 41 is aligned with the physical transducer edge. However, the “face” of the transducer that magnetically interacts with the recording medium is in direct contact with the medium. h is different in shape and dimension from the transducer surface(s) to which it indirectly abuts. May be different. The emitted magnetic flux taps the magnetic pattern corresponding to the signal of the winding 25. 42. For example, the magnetic tape 42 is inserted into the conversion gap 26 in the direction of the arrow 43. By advancing the tape, a changing magnetic signal pattern is recorded along the tape. Ru.

Transducer 20 is used to reproduce signals previously recorded on tape 42. When the tape 42 is moving, the magnetic flux emanating from the tape 42 engages the gap 26. , detected by the activated conversion section 56 and coupled to the conversion signal winding 25. . A converter 20 converts the magnetic flux 16 in the converting winding 25 into an electrical signal proportional to the recording magnetic flux. do.

According to the present invention, the selected segment or conversion area 56 is defined by the conversion gap 26. one selected segment of the recording medium 42 through the unsaturated portion in the core. A section within the magnetic cores 21 and 22 that allows the conversion signal winding 25 to be electrically coupled. obtained by controlled saturation of minutes.

In order to enable such control, the magnetic transducer 20 has a width dimension W of the transducer gap. A magnetic circuit having a reluctance gradient extending in the direction of is connected to the signal winding 25 and the conversion gear. It is formed so as to extend between the tops 26. This reluctance gradient is the width of the conversion gap. Characteristics of the transducer in the direction of W (saturation magnetic flux density of the core material, cross-section through which the control flux flows) area, length of the path through which the controlled magnetic flux flows). successfully achieved. Each of the last two properties in parentheses is the magnetic permeability of the core material. Determine. Varying each of these properties to obtain the desired reluctance gradient An example of a magnetic transducer 2o using a magnetic transducer 2o is described below. However, how Regardless of how the desired reluctance gradient is set, the magnetic transducer 2o The portion selected to magnetically couple the signal winding 25 and the recording medium 42 is unsaturated to activate one selected segment or area 56 of the gap. The signal winding 25 and the conversion gap saturate some parts of the magnetic circuit while converter control for setting the selected control flux of one VC in the magnetic circuit between the It is connected to saturation control means contained within controller 112 (FIG. 1). saturation control means Embodiments include magnetic transducers 2o with respect to the desired path to maintain tracking alignment. will be described in detail below in connection with controlling the placement of the conversion zone 56. however , selectively coupling magnetic flux to a magnetic circuit extending between the signal winding 25 and the conversion gap 26 and to cause movement of the conversion area 56 along the gap 26. Any saturation control means capable of varying this coupled flux in a can be used.

In the embodiment of magnetic transducer 20 shown in FIG. 2, the desired reluctance slope is by varying the width dimension along the length of each of the magnetic cores 21,22. determined. This change is in the direction corresponding to the width W of the gap 26, and the slope is Due to the varying width dimensions of the two magnetic cores 21 and 22 extending in opposite directions in the core. It is determined that

These varying width dimensions are determined by inserting the nonmagnetic conductive layer 201 between adjacent magnetic laminated bodies. A plurality of magnetically transparent flat surfaces stacked on top of each other in planar juxtaposed alignment with This is obtained by constructing the magnetic transducer 20 from the laminated body 200.

The stacked magnetic laminate 200 and nonmagnetic conductive layer 201 are, for example, integrated. are joined together by known joining techniques to form a body or structure 202. Ru. These stacked magnetic laminates 200 and non-magnetic conductive layers 201 have a conversion gap 26 and the signal winding 25, a plurality of magnetically insulated Define a magnetic circuit containing a magnetic flux path. Magnetic isolation occurs between adjacent magnetic stacks. Non-magnetic conductive layer 201 inserted between the magnetic stacks defining a large reluctance path given for the existence of Being electrically conductive, layer 201 is also an eddy-carene layer. It also works to reduce eddy current effects.

Each magnetic stack 200 is connected to the back core portion 206 at one of its edges. It has two side core portions 203 and 204 that are joined together, and a circumference of a back core portion 206. A signal winding 25 is wound around it. Both ends of the side core portion are provided with a conversion gap 26 It is joined to the front core portions 207 and 208 separated by M, respectively. On the other hand, Each magnetic insulating layer 201 is preferably separated by adjacent magnetic stacks 200. transform gap 2 without interruption to maintain magnetic isolation between the magnetic flux paths defined by Extends through 6. However, each layer 201 consists of adjacent magnetic stacks. It has a configuration corresponding to that of As is clear from Figure 2, multiple magnetic stacks The body provides separation for the magnetic circuit defined by each magnetic fR layer body 200. their front cores along the width W of the gap 26 so as to form a converted area. The separated portions at 207 and 208 are stacked side by side.

The desired reluctance gradient is in a complementary manner in the direction corresponding to the width W of the gap 26. Varying the widths of the two side core portions 203 and 204 of the magnetic laminate 200 with This can be obtained with the configuration of the embodiment shown in FIG. In detail, one of the gaps 26 The width dimension of the lateral core portion 203 at the side is chosen in one direction through the core portion 21. 204 on the other side of the gap. The width dimension varies gradually over the range in opposite directions through the core portion 22. Second In the illustrated embodiment, the side core portions 205 of the magnetic stack range from a minimum width to a maximum width. a portion 21 and an associated lateral core portion 204 of the magnetic stack; decreases bi-dimensionally across the core portion 22 from its maximum width to its minimum width. This aspect , the side core portions 203 and 204 of the stacked magnetic laminate 200 are Reluctance gradients extending in opposite directions through the two core parts 21 and 22 respectively Establish. The magnetic saturation of a body of magnetic material is an inverse function of its reluctance. follow and extends across its two core parts 21 and 22 in the direction of the width W of the gap 26. By configuring the magnetic transducer 20 to have a reluctance gradient that The width dimension of the magnetic transducer can be adjusted by appropriately applying the control magnetic flux to the sections 21 and 22. selective saturation along the line becomes possible. Additionally, the level of applied control flux can be varied. By this, the number of adjacent side core portions 205 and 204 that are saturated is selective. The side core part of the smaller width is given control. It saturates at lower levels of m flux. For example, saturate the side core part of the smallest width. Gradually increasing the control flux from a certain level will gradually increase the width of the side core. producing a gradual saturation of minutes. 2 ctance gradient is the two core parts 21 and 22 Injects a gradually changing level of controlled magnetic flux into the core section to extend in opposite directions through the In particular, the magnetic saturation of the stacked side core parts 203 and 204 is Proceeds in opposite directions through the two core parts in the direction of the width W of the gap 26 and changes The direction of the control flux level determines the progression of saturation through the core section.

a selected transducing area 56 for coupling magnetic transducer 20 to magnetic recording medium 42; In order to determine the magnetic saturation of one core part, the magnetic saturation of each of core parts 21 and 22 is Only the side core portions 203 and 204 within the selected width segment are saturated. Core parts on other sides outside of the selected width segment of the parentheses are not saturated controlled as follows. The saturated side core portions can conduct additional magnetic flux. Therefore, the magnetic saturation of the side core portion of the magnetic laminate 200 is determined by the laminate. increases the reluctance of the magnetic circuit that is Therefore, the core part 2 which is saturated All stacks 200 within each selected width segment of 1 and 22 are filled. The conversion gap formed between the front core portions 207 and 208 of the combined laminate 200 This prevents magnetic flux coupling between the width segment of the top 26 and the signal winding 25.

However, the control of magnetic saturation is limited to at least one of the magnetic stacks 200. both lateral core portions 203 and 204 remain unsaturated. , and also, for example, the segment 56 of the gap 26 and the signal shown in FIG. A low reluctance magnetic circuit path is defined between the windings 25. As a result, the conversion A specific width segment of the cap 26 is used to transfer information between the magnetic recording medium 42 and the signal winding 25. It is activated to form a conversion area 56 for transferring signals. Furthermore, Activation of specific middle segments of the transduction gap 26, as described in detail below. causes a movement of the activated width segment along the width W of the translation gap 26. transducing zone 56 and selected path 126 along magnetic recording medium 42 (Figure 41). proper control of the magnetic saturation of the two core sections 21 and 22 to maintain alignment between the two core sections 21 and 22; can be controlled by handling.

In the magnetic transducer embodiment of FIG. 2, core portions 21 and 220 have controlled saturation. are stacked side core portions 203 and 32 through their respective winding holes 31 and 32. Control currents 1 and 2 are applied to a pair of control windings 58 and 59 entering the control windings 58 and 204. This is achieved electromagnetically by Varying width of side core portions 203 and 204 For this purpose, the side core portions of each core portion 21 and 22 are connected to control windings 38 and 22. By giving control currents 1 and 2 to 39 and 39, the Preventing a correspondingly varying reluctance gradient that defines the area.

Each of control windings 38 and 59 were included within converter controller 112 (FIG. 1). It is connected to current source type saturation control means. When a current is applied to the controller m38 or 59, , a control magnetic flux is induced in each side core portion 203 or 204 through the winding. It will be done. The magnitude of the applied control current is determined by the control magnetism induced in each side core part. Determine the amount of bundle and set the limit for stacking side core sections of a given range of width. The range of magnitude of the control current is related to the same control windings 38 and 39 that carry the control current. selected to effect selective saturation of the stack of side core portions 203 or 204. It will be done.

This range indicates which side core portion of the stack the smallest control current within this range is. is chosen so as not to cause any magnetic saturation, whereas the maximum magnitude control current is Create magnetic saturation of all side core sections within the stack.

Conversion for transferring information signals between the signal winding 25 and the magnetic recording medium 42 Selective activation of a particular width segment of the gap 26 results in a first This is achieved by applying a control current 1 to one of the control windings 38 or 59. . This size is determined by the selected width segment of the core section 21 or 22 with which this winding is associated. Selected to cause magnetic saturation of the side core portions 203 or 204 within the be done. A second control current 2 is applied to the other of the control windings, and this other winding is Magnetic saturation of the side core sections within the selected width segment of the other of the connected core sections. It has a size selected to allow it to do so. These two control gland currents The size of 1 and 2 corresponds to at least one side of the stacked magnetic laminate 200. The core portions 205 and 204 are selected to remain magnetically unsaturated. magnetic each magnetic field having side core portions 203 and 204 that are The laminate, or the entire laminate 200, includes a front core portion of each such laminate. Width segment of gap 26 formed between minutes 207 and 208 and signal winding 2 5 to define a low lactance outlet circuit through the unsaturated side core section. this is magnetic A magnetic circuit and a magnetic circuit capable of coupling information signals between the recording medium 42 and the signal winding 25 and conversion area 56 is set.

To move the width segment or conversion area 56 in the direction of the width W of the gap 26, The saturation control means changes the magnitudes of the two control currents 11 and 2 in opposite directions. two This opposite change in the magnitude of the control currents 1 and I2 causes the core portion 2 The number of saturated side core portions 203 and 204 of 1 and 22 respectively, thus The width of the saturated segments within these core portions varies. In addition, 1 large control current The saturated segments within the core portions 21 and 22 are The width of the tip is varied in the opposite direction in the direction of the width W of the gap 26. conversion In order to keep the width W3 of the area 56 constant, the sizes of the two control currents 1 and I2 are The sum of the magnitudes remains constant even if their individual magnitudes are changed.

Varying the magnitude of the control currents 1 and I2 as detailed below. That is, in accordance with the present invention, the deviation of the area from the selected path 126 (FIG. 1) Accordingly, the conversion zone 56 is moved to thereby maintain alignment between the zones and the selected path. It is executed in such a way that it lasts. Furthermore, according to one feature of the present invention, the control current This change in magnitude causes the sensed change in the transformation area 56 associated with the selected passageway 126 to Controlled according to deviation. One sensing means 150 is selected to perform this control. The transducer 2o is operatively configured to detect deviations of the transducer zone 56 from the passageway 126. be combined. The detected deviation is applied to saturation control means included in converter controller 112. available. In response, the saturation control means are applied to the control windings 38 and 39 of the converter 20. In order to correct the detected deviation by changing the magnitude of the control currents 1 and I2 that are obtained, to move the conversion area 56 in the direction along the width W of the conversion gap 26, It thereby maintains alignment between conversion area 56 and selected passageway 126.

As is clear from the description in connection with FIGS. 1 and 2, one suitable transducer versus recording medium The maintenance of tracking alignment is movable along the transducer gap 26 by means of magnetic control. Correcting deviations in the transducer 20 and tracking alignment to define a transducer zone 56 that is By cooperating with a transducer controller to control such movement, the present invention achieved according to the following. Furthermore, this cooperation may depend on mechanical changes in the control mechanism. Achieve maintenance of proper tracking alignment without any problems. As a result, magnetic recording and/or is due to the adverse effects of the characteristics of the tracking control technology previously used in recycled lids. Avoided.

The method and apparatus of the present invention selects and controls the position of transducer 20 and transducer zone 56. Other embodiments of the transducer 20 and controller described above in connection with specific embodiments of electromagnetic technology Examples may be used. For example, electromagnetic saturation control means can replace magnetic saturation control means. May be used for In the magnetic saturation control means, the control magnetic flux is to saturate selected areas such as side core portions 203 and 204 (FIG. 2). The transducer 20 is coupled to the transducer 20 by a magnet that provides a controlled magnetic flux that can be directed in the same direction.

Similarly, the preferred reluctance gradient of the body of magnetically permeable material of transducer 20 The arrangement includes a transducer gap in addition to the side core parts as in the transducer embodiment of Figure 2. 26 and the signal winding 25, and at other locations within the body of the transducer of FIG. In addition to the magnetic flux passage cross-sectional area as in the case of the example, changes in other magnetic properties of the body can be set. As discussed below in connection with other embodiments of transducer 20 , the preferred reluctance gradient of the magnetically permeable material forming the transducer 20 is It is set by changes in the saturation magnetic flux density of the body or by changes in the length of the magnetic flux path in the body. can be done.

Furthermore, the transducer embodiment of FIG. so as to enable selected saturation of areas or portions at the face 41 (FIG. 2) of the converter. Configuring the magnetic transducer 20 as well as the saturation control means is similar to the embodiment of the transducer shown in FIG. It has the advantage of avoiding significant losstalk effects in the process. Lost like this The unsaturated side of the laminate 200 has saturated side core portions 203 and 204. 41 may occur in the transducer embodiment of FIG. For example, During recording operations, these surface portions form selected unsaturated side core portions 205 and 204. It is easy to combine with the stray magnetic flux generated in the part of the surface 41 associated with the laminate 200 having This stray magnetic flux is coupled to the recording medium 42 at a location other than the selected path 126. are combined and recorded. Of course, such recording of stray magnetic flux does not produce noise. Alternatively, information signals recorded at other locations may be deteriorated. Also, such aspects portion of the information signal being reproduced by the selected conversion area 56. Put it away. Such deterioration is caused by the location on either side of the selected conversion area 56. A position of the recording medium 42 other than the passage 126 where the unsaturated surface portion is selected at a position other than This occurs because the selected conversion area that occurs in the radiated magnetic flux is coupled with the emitted magnetic flux. 6 The laminated structure of the embodiment of transducer 20 shown in FIG. Provides additional restrictions when used for alignment control. That is, the magnetic laminate 20 0 and the thickness of the inserted non-magnetic conductive layer 201. If the conversion area 56 is moved stepwise depending on the width WK of the cap 26, That is true.

As described in more detail below, the transducer 20 is not subject to deleterious or losstalk effects. In other embodiments, the conversion area 56 may be moved anywhere along the width W of the conversion gap 26. a non-laminated continuous series of magnetically permeable materials that can be Enables use of body parts. This feature combines the conversion zone 56 along the recording medium 42 and the has the advantage of allowing maintenance of precise alignment between selected passageways 126 (FIG. 1). . This advantage is particularly important for high frequency broadband information associated with narrow tracks along the recording medium. This is important in applications involving recording and reproducing information signals.

To avoid disturbing crosstalk, the conversion area 56 is located along the width WK of the conversion gap 26. An embodiment of the transducer 2o that allows it to be positioned and moved anywhere is shown in the third embodiment. 7 is described next in connection with FIG. In more detail, the converter shown in Figures 3-7 The configuration of the embodiment is such that the transducer surface 41 is in the saturation region hatched in FIGS. 3 and 4. 57. Selected close to and on either side of the conversion gap 26 as shown by 58 be saturated. The saturated regions 57 and 58 are located on both sides of the conversion gap 26. 40.46 defining adjacent large transparent unsaturated portions or regions 40.46 on each side. .

At least a portion of each of portions 40.46 has a width extending across gap 26. of the gap to define a large transmissive conversion area or segment 56 of W3. Opposite each other in position. As is clear from Figure 3, the overall conversion gap 26 The width W, ie, W1+W2+W5, is constant.

It is preferred to have regions 40 and 46 unsaturated and regions 57.58 saturated. This is accomplished by controlling several independent factors. These factors The configuration (material, form, etc.) of the transducer body 202 and the selection of the core material and body 202 It includes means for coupling the control flux to effect selective saturation. this The coupling means are indicated schematically by dotted lines 8 and 9, each of which is described in more detail below. The control fluxes are each coupled to one core part 21, 22 in a similar manner. selective satiation In embodiments using electromagnetism to perform the summation, the coupling means It is in the form of current support windings 8 and 9 coupled to 21 and 22. These windings 8 , 9 induces a controlled magnetic flux 47.11 in its respective core portion 21.22. The control current (1) is supported so that the control current (2) is maintained. Winding positioning and control current 11. I2 is such that the magnetic flux induced thereby leaves regions 40 and 46 unsaturated. As shown by the hatched areas in Figures 3 and 4 and as described above, each It is chosen to saturate the region 57,58 in the core half. Preferably, The control current is controlled so that the control flux does not intersect the transducer gap 26 or one core. selected to prevent flow from one section to another core section.

Increase the magnitude of control current ■1 proportionally while decreasing the magnitude of control current ■2 By this, each width W1. W2 is made to vary proportionally and the conversion segment The point or area 56 is selectively moved along the width W of the transducer gap 26. . For example, in order to move the conversion segment 56 along the conversion path W at high speed, By changing the magnitude of the two currents 11°I2 in the opposite direction, the saturated portion 57.5 8 width W1. A saturation control circuit is used to vary W2. Width during such movements To keep W3 constant, the sum of the varying control currents is kept constant, i.e. 1 1 + work 2 is assumed to be a constant value.

As is clear from FIG. 3, the conversion magnetic flux path 16 extends around the circumference of the winding window 24 and It intersects with the converter winding 25. Preferably, the control flux is not magnetically coupled to the converter winding. No. If the control flux lines 47, 413 are related to the conversion flux 16 as shown, and extend in generally parallel planes, the magnitude of each of the control currents is the result The control magnetic flux 47.48 generated as It is selected so that it is not coupled to the conversion winding 25. Width W1. W2 proper Depending on the control, various modes of operation can be achieved. For example, the location of the conversion area 56 is at locations along the magnetic medium 42 to maintain alignment between the conversion zone 56 and the desired path. At a desired height at a predetermined isolated location with respect to the desired passage 126 (FIG. 1). Can be repositioned with precision.

As is clear from the above description, one area of the surface of the transducer 20 is located in the transducer gap. saturated adjacent to the conversion gap 26 while keeping other adjacent regions unsaturated; It will be done.

This results in crosstalk or stray magnetic flux due to the transducer 200 surface 41 on that surface. Ease of detection is essentially reduced.

Embodiments of the transducer 20 of the type shown in Figures 3-7 provide high quality performance. well-defined boundaries between adjacent saturated and unsaturated portions of the core 21.22. is desired. This includes suitable materials for transducer body 202 as described below. material and the maximum permeability between adjacent cross-sectional areas of each transducer core section. The contact magnetic core part and the control such that the rate of change can be obtained over W during the conversion talk. This is obtained by arranging and configuring the control windings. This means that each core A selected area in the plane of the part is saturated by a control current to produce a magnetic flux of does not allow it to pass through, but immediately adjacent contiguous parts transmit the information signal. remain sufficiently transparent. As a result, the performance of the converter 20 is Magnetic permeability versus controlled magnetic flux density gradient between adjacent saturated and unsaturated regions within the core region of depends on the sharpness of the

As an example, FIG. The known magnetic permeability m vs. magnetic flux density of preferred magnetic core body materials such as PS52B The characteristics of B are shown. As is clear from Figure 8B, 400 is also relatively large. The magnetic permeability m is obtained at a magnetic flux density B of 131.4000 Gauss or less, and this magnetic permeability The value of is sufficient for the desired conversion operation. The saturation magnetic flux density of that material is shown in Figure 8. As shown, approximately B2 = 6000 Gauss, corresponding to a permeability of less than 100.

At such low permeability or high reluctance levels, essentially Talk or stray magnetic flux cannot be detected depending on the material.

This results in a large permeability region within the transducer core, i.e. an unsaturated region and an adjacent saturated region. To obtain the desired rapid transfer between regions, the permeability is adjusted as shown in Figure 8. Electromagnetic A preferred embodiment of the magnetic transducer as controlled is described in detail in connection with FIG. . The magnetic transducer 20 is smoothly wrapped to define a transducer gear plane 25. and two corresponding magnetic poles 27, 28 with abutting magnetic poles in contact with the polished surface. It has core parts 21 and 22. 1 so that the winding window 24 accommodates the conversion winding 25. or the other core portions 2j, 22. A preferred non-magnetic spacer material is Pole surface 2 is formed to obtain transducer gap 26 using known transducer gap formation techniques. Given between 7.28. For example, a magnetic recording medium such as tape 42 (Fig. 1) The facing conversion surface 41 extends in a plane substantially perpendicular to the gear tooth plane 23. The transducer is using known techniques to obtain the desired contour and conversion gap depth, respectively. Accordingly, the outer shape may be set as shown by dotted line 18.

According to an important feature of the embodiment of FIG. set at minute 21.22. These holes extend over the entire width W of the transducer 20. extends to both the converter gear plane 23 and the converter face 41 at the selected angle. . The control winding 58.39 is passed through a hole in the core part 21.22, through which the multi-control winding Portion 51.52 passes through the core portion at an angle defined by control winding hole 31.32. It grows.

In the preferred embodiment of FIG. 5, the core portion 21.22 is a ferrite PS52B or is two from a single block of magnetic 7-elite material such as crystalline ferrite. manufactured as identical core halves. Holes 31 and 32 are the width of each core half. across, i.e. from the upper lateral surface 53.54 to the opposite lower surface 36.37''! Obtained by Yamond drill operation. Each core half 2 defines a gap plane 25 1.22 surfaces are lapped and polished smooth. like glass New non-magnetic conversion gap-forming spacer materials can be produced by sputtering, e.g. in vacuum. A table of one or both core parts coincident with the gap plane 23 using a technique such as given to the surface. The core halves 21, 22 prepared in this way are Rotate one core half with respect to the other by 180° so that the surfaces of This results in assembled and abutted core parts. In that state, the core part oppositely symmetrical configurations of the control winding path through the gaps and The winding holes 31.32 are provided with respect to the planes 23 and 41 of the transducer plane. follow In the assembled converter 20, the control winding hole 31.33 and therefore the control winding themselves are oriented in opposite directions with respect to both the transducer gap plane 23 and the transducer face surface 41. Extends in a oriented angular relationship. These are assembled using well-known bonding techniques. The core halves are glassed together at the transducer gap plane 23 to obtain a transducer gap 26. connected to each other.

In another embodiment, the abutment core portions 21.22 are of a common solid block of magnetic material. may be given by In this case, the desired conversion gap length corresponding to For example, a slot with a width of It is provided inwardly with respect to the surface 41 by the construction. This slot is well prescribed (limited) ) Preferred non-magnetic gap spacer material to form a transducer gap 26 filled with fees. The winding window 24 and the control winding holes 31, 32 are drilled using known drilling techniques. by drilling across the width of the transducer.

The control winding SR, 59 is associated with FIGS. 5 and 4, as described in more detail below. As described above, the unsatisfied portion extending along one segment of the conversion gap 26 the transducer to obtain a highly permeable transducer area 56 and a magnetically saturated surface area. Selected portions of each core portion 21, 22 are saturated differently at surface 41. It works to support the control currents II and I2. In a preferred embodiment, the control current 11. I2 is a conversion area or segment of a constant width W3 along the width WiC of the conversion gap 26. It is differentially changed to cause movement of the segment 56. In this manner , between the conversion zone 56 and the selected path 126 along the recording medium 42 (FIG. 1). Alignment is maintained when an information signal is recorded or played back relative to a selected path. It will be done.

FIG. 6 shows a more detailed configuration of the embodiment of converter 20 described above in connection with FIGS. 3-5. show. Two pairs of imaginary planes 44°45 and 59.60 respectively correspond to the winding holes 31.32. Each is shown as overlapping the longitudinal axis.

The planes 44, 45 are parallel and each along a line parallel to the transformation gap plane 23. It intersects the upper and lower lateral surfaces 33.34 and 36.57. Plane 59.60 intersects these lateral surfaces along lines perpendicular to the transform gap plane 23.

As shown in FIG. , 36, 57, the plane defined by the gap plane 23 and the transducer plane 41 is The exchange gap 260 has two oppositely oriented wedges on either side. ) form part 49.50. These wedge-shaped portions are connected to the control current 11. By I2 the magnets to be differentially and selectively saturated to define the desired conversion zone 56. It represents the part of air core 21.22.

FIG. 7 is an enlarged perspective view of one wedge-shaped section 50. oriented in two opposite directions The wedge-shaped sections shown below are related because they are substantially the same. The following description is likewise given for the wedge-shaped portion 49. As shown in Figure 6 7, the edge 30 of the wedge-shaped portion 50 in FIG. determined.

For a given width W of the conversion gap 26, the wedge-shaped portion 50 has a parallel cross section. It is assumed that it is divided into the product L1-Ln. These are face 41 of transducer 20 and Extends and changes perpendicularly to the two planes defined by the transformation gap plane 23. The exchange gap 26 has a generally increasing surface area along the width WK. converter 200 Oppositely oriented wedge-shaped portions 49 (not shown separately) It is to be understood that they have corresponding cross-sectional areas that gradually increase in opposite directions.

In FIGS. 6 and 7, when the control circuit I2 is applied to the control winding 39, It is represented by magnetic flux lines 48 extending in the core portion 22 and around the circumference of the winding portion 52. inducing a corresponding control flux. The transparent core parts 21 and 22 are the conversion gears. Due to the low reluctance with respect to cap 26, control flux lines 48 It is likely to be trapped in the body forming the A part, and to be combined with the conversion winding 25. It does not extend across the conversion gap 26. This is due to the control flux and the variation within the transducer 20. Minimize interference between exchange signal fluxes.

in the opposite direction to ensure proper movement of the transducing area 56 along the width of the transducer 20. The control current changes to 11. The value of I2 is the control magnetic flux induced by it, 47.4 8 are oriented in opposite directions within each magnetic core half 21,22. The continuously changing cross-sectional areas L1-Ln of the wedge-shaped portion 49.50 are saturated in order. sea urchins are selected. For example, if a gradually increasing control current ■2 is applied to the control winding 39, When the cross-sectional area L1-Ln shown in FIG. Gradually saturates from the smallest area to the largest area in direct proportion to the size. You will be able to do it. Increase the control current in one control winding and increase the control current in the other control winding. Wedge-shaped portions 49 oriented in opposite directions by reducing the flow by a corresponding amount ．． Each of the 50 different parts is made to be differentially saturated and unsaturated. Yes, this results in a movement of the conversion area 56 along the gap 26. Recording medium 42 ( 9) Lace by conversion area 56 with respect to selected path 126 along FIG. By varying the control current according to the deviation in the path being is moved across the width of the conversion gap 26 to compensate for this deviation. This maintains alignment of the transducer section 56 with the selected passageway.

In the preferred embodiment of FIG. 6, the differentially varying current Ig(11+I2) is As mentioned above, a constant value is set to obtain a constant width W3 of the conversion area 56 on the converter surface 41. will be maintained.

From the above, the magnetic permeability of the saturated region is approximately equal to the magnetic permeability of air, and therefore The unsaturated part with high reluctance and the other type is an information signal about the recording medium. has a relatively high magnetic permeability, which is desired for the transfer of

Figure 10 shows an example of two superimposed magnetic flux density vs. permeability characteristics 53.53a, Each of these has a wedge shape oriented in opposite directions, corresponding to the characteristics shown in Figure 8. Associated with one of the sections 49 and 50 (FIG. 6). Figure 9 shows wedge-shaped part 49.5 0 (FIG. 6) rotated by 90'; FIG. Hatched part 5 7.58 is a saturated region, i.e. a core with a permeability less than 100 represents the core portion with a large reluctance. Other cores in Figure 9 The part is unsaturated with a permeability above 400 and therefore the desired low reluctance. Represents a large transparent area 40.46. A conversion gap is formed to define a conversion area 56. by an overlapping unsaturated highly permeable region 40.46 extending across the top 26. The magnetically permeable area formed corresponds to the nine overlapping portions of the overlapping feature 55.55a. Accordingly, this part represents a change in permeability between 100 and 400. 9th and 1st As is clear from Figure 0, a well-defined conversion area 56 preferably allows only has a sharp permeability versus magnetic flux density gradient. This is a conversion coefficient with a sharp characteristic curve. A material is selected and the large magnetic flux density change is the entire width of the conversion gap 26 WK. Designing wedge-shaped sections to be achievable between adjacent cross-sectional areas along This can be achieved by Preferably used to further increase the permeability gradient. The magnetic core material has magnetic anisotropy and its axis of easy magnetization is perpendicular to the transducing gap plane. Directly oriented. Such a material is suitable between the transducer gap 26 and the signal winding 25. A reluctance difference is then formed that facilitates the formation of a desirable magnetic circuit path. Give through the body.

To facilitate the formation of a well-defined and defined conversion area 56, a substantially rectangular The cross-sectional area Ll-Ln of the shape spans the wedge-shaped portions 49 and 50 (Figs. 6 and 7). so that the holes 31.32 in the core half 21.22 are configured so as to obtain It is preferable. This means that the wedge-shaped portion containing the surface 41 of the transducer 20 is removed from the surface area. Ensures saturation without saturating remote core parts. Moreover, this is boring. Minimize the control current value required to obtain the sum.

To further increase the magnetic flux density gradient between two adjacent cross-sectional areas, a wedge The shape of the shaped part is approximated to the shape of the negative slope part of the magnetic permeability vs. magnetic flux density characteristic shown in Figure 8. That is, the cross-sectional area L1-Ln of the wedge-shaped portion 49.50 is calculated logarithmically. It is preferable that the amount increases to . This connects holes 31°32 to core 2 along the logarithmic function path. This can be achieved by stretching through 1.22.

FIG. 11 shows controlling the position of the conversion area 56 on the width WKG arm surface 41 of the converter 20, Thereby, the conversion area 5 with respect to the selected passage 126 of the recording medium 42 (FIG. 1) converter 200 control winding 6 to compensate for deviations in the path traced by Circuit diagram of one embodiment of the saturation control means 54 used to drive the 8.59 It is. The saturation control means of FIG. This is an electric circuit using a pressure source 61. The voltage Vc is determined by the circuit shown in Figure 11 as follows. Control current that changes differentially in this manner 11. Converted to I2. By voltage source 61 The adjustable output voltage Vc provided by Given to transfer input. This amplifier 65 has a feedback resistor 64 and a voltage It is composed of 7 oroa. The output of amplifier 63 has a feedback resistor 67 It is connected to the inverting input of a second operational amplifier 66 via a resistor 65. Amplifier 66 inverts the output of amplifier 63. The output of the first multiplier 63 is also a feedback connected to the inverting input of a third operational amplifier 69 having a resistor 70 via a resistor 68. It will be done. The output of the second amplifier 66 is connected to a fourth amplifier having a feedback resistor 73. It is connected to the inverting input of 72 via a resistor 71. The adjustable potentiometer 74 is The control current is connected between the negative DC voltage source and ground so that the offset is zero. . The output of potentiometer 74 is passed through resistor 75 to the inverting input of third amplifier 690. and connected to the inverting input of the fourth amplifier 72 via a resistor 76, respectively. It will be done.

The output of the third amplifier 69 is connected to the above-mentioned first control winding 38 of the converter 20. , which is then connected to the inverting input of amplifier 69 via feedback resistor 70. It will be done.

Similarly, the output of the fourth amplifier 72 is connected to the second control winding 39 of the converter 20. , whose second terminal is connected to the inverting input of the amplifier 72 via a feedback resistor 73. Continued. The connection between control winding 38 and resistor 70 is provided to ground via resistor 77. It will be done. Similarly, the connection between control winding 39 and resistor 73 is connected to ground via resistor 78. Given.

The non-inverting inputs of all four operational amplifiers 65, 66, 69 and 72 are grounded. be done. Amplifier 69.72 and respective resistors 70.77 and 75.78 are 1 and 2 represent first and second current sources, respectively.

In operation, the output voltage Vc provided by voltage source 61 is applied to voltage follower 65. ．． 64 to a first current source 69°70.77. This current source A control winding 38 is provided with a control directly proportional to the output voltage Vc provided by the voltage source 61. Supply electric current worker 1. Obtained from the output of the amplifier 63 and sent to the inverters 66 and 67 The voltage thus inverted is further applied to the second current sources 72, 73, 78. this The second current source supplies the second control winding 39 with a voltage Vc provided by the voltage source 61. Give a control current ■2 that is inversely proportional to .

A potentiometer 74 connected to the negative (7) DC [pressure] ) Io, which in the example is half of the minimum and maximum control current values, i.e. Io = (Imax + lm1n)/2.

As is clear from the above description, the output voltage Vc provided by the voltage source 61 The magnitude varies within the range of Vcmin and Vcmax as shown in Figure 12. When the circuit 54 changes the control voltage to the first and second voltages, respectively. Correspondingly varied control currents obtained at the respective outputs of the current sources 11. I Convert to 2. In the embodiment of the saturation control circuit shown in FIG. , I2 vary linearly. Therefore, the control current 11. I2 are differential, i.e. opposite to each other. direction and substantially linearly proportional to voltage Vc as shown in FIG. and is determined by the following formula:

I1 = KVc + Io --- (1) I2 = -KVc + Io... ・・・・・・・・・(2) Here, K and 0 depend on the parameters of the circuit in Figure 11. is a constant, and can be derived from it.

Further related to the above-described preferred embodiment of transducer 20 shown in FIG. 6, current 11. I2 induces a magnetic flux in the magnetic core portion surrounding the control winding portions 51,52. control Current 11. I2 is the selection of the magnetic core portions 21, 22 including the respective surface portions 41. The area saturated in accordance with the present invention (FIG. 9) is (such as regions 57 and 58 shown in FIG. (such as area 56 shown in FIG. 9).

As shown in the characteristics in Figure 12, the control voltage is changed from -Vcmin to +Vcmax. Due to the change, the control current value (1) changes from lm1n to Imax. child Here, Imax is selected to be less than or equal to the saturation current level Isat. 6th, 7th and In Figure 12, l5at is the entire cross-sectional area L1-Ln excluding the unsaturated portion. i.e. enough current to saturate the entire wedge-shaped portion 49 or 50 (FIGS. 6 and 7). Corresponds to the flow value. The unsaturated portion is maintained to obtain a conversion zone 56 (FIG. 6). Since it is necessary to make the maximum control current Imax equal to the saturation current level l Selected to be 5at or less.

1 and 11, the voltage source 61 is applied along the width of the transducer gap 26. Allows controlled movement of the conversion area 56 and thereby traced by the conversion area 56 When there is instability that is to be caused by deviation between the selected path and the selected path maintaining alignment between the conversion zone 56 and the selected path 126 along the recording medium 42 to It can be controlled to More specifically, the voltage source 61 has Vc max and Vc Set a voltage equal to the sum of minO values, that is, lVcmax l + lvcminl. It includes a voltage supply 220 that can be used. This voltage supply source 220 is connected to the center tap 2 Referenced to ground potential at 21. This is the negative voltage -Vcmin and the positive voltage The voltage Vc within the range defined by +Vcmax (centered around the voltage of 0) to the saturation control circuit of the a control current 11 that determines the position of the conversion zone 56 along the width of the top 26; Occurrence of I2 is possible.

The voltage Vc applied to this saturation control circuit is controlled by a voltage supply source 220 to this circuit. Select the desired voltage within the available range from -Vcmin to +VCmax. is determined by the means 222 for giving a specific value. In the embodiment of FIG. This means 222 includes a variable resistor or potentiometer, which also has a resistive element 2 23, both ends of which are electrically connected to opposite polarity of voltage supply 220. The resistive element is adapted to pull the voltage supply. potentiometer 2 22 further includes a contact 224, which connects a resistive element as indicated by arrow 226. 223 and is determined by the position of the movable contact along the resistive element. According to the present invention, the position of this movable contact 224 is Control current 11 applied to converter 20. I2 is provided by the conversion section 56 of the converter 20. and the selected path 126 along the magnetic recording medium 42. is controlled to compensate for deviations in This control controls the path being traced and the selection producing movement of contact 224 according to a command function representing the expected deviation between the paths This allows it to be performed in an open-loop predictive manner. open loop circuit The control mechanism provides this type of control and is traced by the conversion area 56, for example. associated with a selected passage 126 whose passage does not correspond to a normal traced passage; must be adjusted from the normal path being traced to maintain alignment Effective in application. In such applications, the flexible The position of the dynamic contact 224 is determined by a tracking controller 22 included in the transducer controller 112. 7. A tracking controller 227 is operatively coupled to the movable contact. and is provided by system controller 132 (FIG. 1) on input line 134. The contact point is caused to move along the resistance element 223 in response to the tracking command. child tracking instructions are provided to the system controller at control input 144 by the operator. Selective control is provided by system controller 132 in response to human control. chosen Predetermined prediction of the normal path traced by conversion area 56 from path 126 For deviations that occur, the control input provided to system controller 132 is of movable contacts 224 along resistive element 223 to compensate for the observed deviations. The tracking controller 227 receives tracking commands to adjust the position from its input line. selected by the operator to be received at button 134. If, for example, the desired What is the normal angle of the path at which path 126 is traced over the media by conversion zone 56? extending laterally along the magnetic recording medium 42 at angles relative to different media length dimensions. If so, the tracking controller 227 controls the control voltage V given to the saturation control circuit. c changes in the direction and by the amount required to provide the desired compensation. The contact point 224 is caused to move along the resistance element 125 in this manner. to conversion area 56 Thus, the normal path to be traced and the desired path 126 along the magnetic recording medium 42 If the angular deviation between the The contact 224 is caused to move over the resistive element 223 at a linear speed, and saturates. A linearly varying control voltage Vc for the control circuit is generated.

In either case, the saturation control circuit uses a movable contact 224 to control the stain pressure follower. In response to the changing control voltage Vc applied to the input of 63, the control changes correspondingly. A current of 11°l2=i is generated. These changing control currents are converted control winding 58.59 of converter 20, and saturation region 57.58 (first 6 and 9) and thereby the position received by the tracking controller 227. According to the tracking command sent to the conversion area #, the width W of the 56i conversion gap 26 move along. In this manner, the conversion area 56 is connected to a controller of the system controller 132. By tracking commands with operator-selected control inputs applied to force 144 The determined preview path can be traced along the magnetic recording medium 42. Ru. The magnetic recording medium causes the conversion zone 56 to trace this path. The conversion zone 56 is maintained along the body 42 in alignment with the selected passageway 126.

Most preferably, the transformation for the selected path 126 along the magnetic recording medium 42 Control of the position of zone 56 is achieved by a closed loop control scheme. This kind of control method In the construction of the equation, the actual conversion area 56 along the width W of the conversion gap 126 is The position is measured or sensed and a corresponding position signal is provided to the tracking controller 227. controls necessary to maintain the conversion zone in alignment with the selected passageway 126. The pressure Vc is generated. For details, please refer to Figures 1 and 11. In this regard, sensing means 150 is operatively coupled to transducer 20 to detect the selected passageway 12. detects the deviation of conversion area 56 from 6 and outputs it to converter controller 112 accordingly. A signal representative of the detected positional deviation is provided to a communication link 130 that is transmitted. This signal is to the input line 229 of the tracking controller 227 included in the transducer controller 112. They are coupled by a communication link 130. In contrast to the closed loose control method, the tracking The switching controller 227 inputs the position error signal on its input line 229 to the selected path 1. 26 represents the desired state of tracking alignment of the tracking area 56 in relation to 26. It is compared with a reference tracking command signal on its input line 134. This comparison is a tracking position representing the degree of deviation of the conversion area 56 from the selected path 126; This causes the tracking controller 227 to operate as a saturation control circuit. The movable contact 2 along the resistive element 223 so as to change the control voltage Vc applied to the Adjust the position of 24.

Adjustment of the position of the movable contact 224 and thus the control voltage Vc translates into the selected path 126. Translation gap 2 that corrects for sensed positional deviations rather than keeping areas 56 in alignment. These are the directions and methods for adjusting the position of the conversion area 56 along the width W of 6.

This closed-loop control scheme operates on selected paths 126 and conversion zones along the recording medium 42. This provides the advantage of greater certainty in maintaining alignment between regions 56. This means that the converter 20 Previously recorded on the magnetic recording medium 42 along a track that coincides with the selected path 126 This is particularly important in applications where the It is essential. In such applications, faithful reproduction of recorded information signals requires depends on the ability to maintain continuous alignment of the conversion area 56 to the track of do. Often, if there is even a slight deviation in the position of the converted area from the recording track, playback will occur. The transmitted information signal undergoes significant degradation. The closed loop control scheme includes conversion zones 56 and Even if there is a foreseeable instability in the relative motion of the magnetic recording medium 42, the recording medium It may be configured to maintain precise alignment of conversion area 56 on the body.

On the other hand, such accurate control is often required when recording information signals on the magnetic recording medium 42. is unnecessary. Such control is used when reproducing recorded information signals. A converter and a recording medium advance control system often change to the recording medium when recording an information signal. Relative transducer caused by inaccurate control of the path traced by the transducer This is unnecessary since small deviations in position relative to the recording medium can be compensated for.

In such a case, the open-loop control scheme may vary depending on the width W of the conversion gap 26 of the converter 20. can be used during recording operations to control the position of the conversion zone 56 along the Therefore, it is foreseen that along the recording medium 42 coincident with the selected path 126. Traffic routes can be traced. Saturation control means 54 and other implementations of converter 20 As will become clear from the following description of the embodiments, various sensing means 150 can be used for magnetic recording media. to detect deviations of the conversion zone 56 with respect to the selected path 126 along the body; can be used. In one embodiment, conversion area 56 is configured such that the information signal is When reproducing from the magnetic recording medium 42 due to the conversion area, the circumferential position of the nominal heavy position is not included. It is intentionally caused to vibrate along the width W of the conversion gap 26 by a short distance. this The vibrations cause an amplitude modulation of the envelope of the reproduced information signal at the vibration frequency, which The nominal position of the conversion area 56 with respect to the recording medium 42 can be detected. child The regenerated amplitude modulated information signal is processed by a transducer controller 112 to determine the transducer area position. A deviation signal is given. This signal is transmitted to the conversion zone 56 from the selected path 126. for use in the manner described above, i.e. the conversion gear of the converter 20 A control voltage is provided to effect a corrective adjustment of the position of the conversion zone 56 along the width W of the cap 26. applied to the input line 229 of the tracking controller 127 to adjust the pressure Vc. Ru.

In other embodiments, converter 20 is configured to define a plurality of conversion zones; At least one of them acts as a tracking conversion area and transfers information to the magnetic recording medium 42. used to reproduce the previously recorded signal along and the other in the conversion area is a magnetic to transfer information signals on the recording medium 42, that is, to perform either recording or reproduction. It is made to operate. Deviation of tracking conversion area from selected path 126 represents the change in amplitude of the reproduced signal. Multiple conversion zones can be formed into the same converter structure. To be performed, the deviation of the conversion area 56 relative to the selected path 126 is previously recorded. It is the same as the deviation of the tracking conversion area with respect to the track of the signal.

Therefore, the signal regenerated by the tracking transducer section is transmitted to the transducer controller 112. is processed to correct the deviation of the conversion area 56 from the selected path 126. Tracking area position error signal used by tracking controller 227 number is obtained.

The particular embodiment of the saturation control means 154 shown in FIG. FIGS. 5 and 9] Thus, in order to achieve the desired movement of the conversion area 56 of the transducer 20, A voltage supply 220 and a variable resistor are used to provide control of the current. deer However, as described below, other embodiments of the saturation control means are suitable for certain embodiments of the invention. preferred for use. Additionally, various embodiments of saturation control means are discussed below. achieves the selected saturation region of the core portion 21.22 (FIG. 2) of the transducer 20. alignment of the transducing area 56 and at the selected path 126 along the recording medium 42. suitable for controlling the controlled magnetic flux source to achieve a shift in the saturation region to maintain It is possible to use it.

One embodiment of the present invention is directed to a specific rotary head segmented scanning magnetic tape recording and / or as described below as configured for use in a playback device. . Rotary head segmented scanning magnetic tape recording and/or playback equipment mainly uses two There are two types of reeds, each producing a different recording format on magnetic tape. make you feel the same

The first one is a helical track format device and the second one is a lateral (transverse) It is a track formatting device. Rotating head segmentation scanning device Devices are typically used for recording and reproducing broadband information signals. because , they can faithfully record and reproduce such signals at relatively moderate tape transmission speeds. can achieve the high relative transducer-to-tape recording media speeds required to I'm here to help. This high relative transducer-to-tape speed is primarily due to the rotatable member. achieved. This member is inserted repeatedly and continuously across the width of the tape by the transducer at high speed. These transducers are supported in such a way that they can be swept in a horizontal manner. The number of rotatable members is 1 It is in the form of a cylindrical member mounted on a shaft that rotates around two axes. The circumferential surface is located where the transfer of information signals takes place in relation to the tape recording medium. positioned in close proximity.

In rotary-head transverse-scan tape recording and playback equipment, the transducer is typically They are placed at 90° intervals around the circumference of the tape, and they are placed at 90° intervals around the circumference of the When the information is sent in the longitudinal direction, it is passed through the information signal transfer area in a spliced manner.

As a result of these relative movements of the transducer and tape, the transducer moves during information signal transfer. horizontally across the width of the tape at an angle close to 90° to the length of the tape. You will have to trace the extending passage. This traced with respect to the length of the tape The reason why the angle of the passageway slightly deviates from 90° is because the transducer passes through the width of the tape. This is due to the small length of tape required to advance through the transfer location. . Typically, the information signal is transmitted in several separate parallel tracks of relatively short length (usually less than 5 minutes). recorded and played back along the track. As a result, I wonder if this is a continuous signal pattern. segmentation. For example, in applications to television signals, or 16, which segment records one field of television information. required for Such segmentation is generally used for faithful recording of information signals. Although permissible from the standpoint of playback and playback, rotating tank scanning tape recording and/or playback equipment may not be installed. The complexity of the meter results in a high price. Rotating helical scanning tape recording and/or Or the reproduction device eliminates complexity, especially for television signal applications. strange This is possible because the number of transducers is small (for example, one), and the track along the tape is (configured for broadcast television applications) For many of today's recording and/or playback devices, it is possible to Ru. Longer tracks avoid segmentation of television field records. This can simplify the design of the device. Furthermore, segmentation Information signal transfer locations over a relatively wide range of relative transducer-to-tape speeds It is useful for faithfully recording and reproducing information signals in both directions of the tape's advance through the tape. be.

In conjunction with other rotary scan tape recording and playback devices, helical scan devices are It has a small and simple information signal processing electronic circuit with a loop feed drive and controller Il. The amount of tape required to record a given amount of program using Make effective use of resources. In the following description, preferred embodiments of the invention are as configured for a helical scan tape recording and/or playback device; be written.

Two typical helical scanning devices are the “alpha” and “omega” winding devices and the being called. In the alpha winding device, the tape is passed through a cylindrical tape guide driver. The helical guide drum around its guide drum is scanned by a rotating transducer from one side of the drum. the tape is introduced into the drum passageway and wrapped completely around the drum so that the tape exits on the other side. It will be done. The helical tape path is seen from above the drum in a direction along the drum axis. It is called an alpha winding device, which roughly corresponds to the Greek letter α (alpha). It will be done. In an Omega winder, the tape is placed approximately radially relative to the drum. The inlet is introduced into a helical passage extending towards the surface of the drum and directs the tape onto the surface of the drum. It passes all the way around the guide, extends around the drum circumference in a helical shape, and extends around the exit guide. 3 and 4, and leave the drum in a generally radial direction relative to the drum. on the drum shaft Approximately corresponds to the shape of the Greek letter Ω (omega) when viewed in the direction along which the tape stretches. It is called by this name because of this. In both of these helical devices, the tape The difference is that it is axially offset along the drum surface relative to the inlet position. Wrap the tape around the guide drum on a helical so that it exits the drum surface at the It will be destroyed. The information signal runs diagonally along the tape at an angle to the length of the tape. are recorded on separate parallel tracks extending over the entire width of the city, which greatly exceeds the width of the city. Tracks can be formed. For a given helical scanning device configuration, , the angular orientation of the recording track, the rotational speed of the rotational transducer as well as the tape guide drum. is a function of the tape transport speed around . This angle is determined by the rotation converter and tape feed. It changes depending on the relative speed of both. In most helical scanning devices, The transducer is supported by a tape guide drum, which consists of two axially spaced circles. formed by cylindrical parts, one of which (usually the top one) rotates and the other part is stationary.

The present invention is configured to transfer television information signals with respect to a magnetic tape recording medium. Particularly noted in connection with the omega-wound rotating helical scan tape recording and playback apparatus developed by The principle is that the alpha-wound helical tape device or other helical It is equally applicable to non-helical magnetic recording media devices. Furthermore, books In the invention, the tape has a circumference of 5t around the guide drum and has a helical path (tape) of almost 360°. (The mechanical design of the inlet and outlet of the loop does not allow for a complete 560° winding.) Although it is described as applying to the Omega winding device that follows the The invention relates to one or more rotating magnetic fields for transferring information signals in connection with a tape recording medium. Using less than 360° of tape winding, such as a 180° tape winding device with a transducer. It is similarly applicable to helical scanning tape devices used in the present invention. The present invention provides that the converter Can be rotated in either direction, with the tape either above or below the exit point. The tape is introduced into the circumferential helical passage of the rotating transducer in either direction and It is also applicable to a configuration in which the circumference bt of this helical passage is fed. converter's The relationship between rotation, tape feeding direction, and tape guide mode with respect to the helical path is determined by seeding. represent different morphological relationships, only one of which is specifically described herein.

The following description of a preferred embodiment of the invention will be described without disturbing the quality of the reproduced signal. It relates to an arrangement of the invention for the purpose of reproducing previously recorded information signals.

However, as mentioned above, the present invention allows for the desired position relative to the recording medium during recording. The transducer may be configured to maintain the Shinshu transducer in place.

In a helical scan tape device, a magnetic transducer generates a trace while scanning the tape. The paths being scanned tend to change scan-to-scan, and during playback operations, Therefore, the tracks do not exactly match the tracks of the recorded information signal. In Figures 13-15, A helical scan converter and cylindrical tape guide drum assembly is commonly used in the 250 It is shown.

FIG. 14 shows this partially cut away. The transducer-drum assembly 250 rotates shown as comprising a possible upper drum portion 252 and a fixed lower drum portion 254. and the upper drum portion 252 is rotated on a bearing 258 mounted on the lower drum 254. It is secured to a removably supported shaft 256, which shaft 256 is of a known type. is driven by a motor (not shown) operatively connected thereto in the manner of. strange Transducer-drum assembly 250 includes a transducer supported by a rotating drum section 252. 20 and is shown rigidly attached to the upper rotating drum section.

As best shown in FIG. 13, the transducer-drum assembly 250 is A magnetic tape traveling downwardly toward drum 254 in the direction of arrow 258 such that One of the rotating helical scanning omega-wound tape recording and/or reproducing apparatuses having 42 Department. In detail, the tape is introduced onto the drum surface from the bottom right and this fixation of the guide post 240 that contacts the tape with the outer surface of the lower drum portion 254. Supplied around. the tape until it passes around the second guide post 242. The circumference pt of the cylindrical tape guide drum runs almost completely. This second guide The strike 242 changes the direction of the tape as it exits the transducer-drum assembly 250. become

The tape passage configuration, as best shown in Figures 13 and 15, is a cylindrical tape Related to the helical passage around the guide drum 250 and necessary for the next tape entry and exit The necessary air gaps or gaps guide the tape 42 through a complete 360° rotation. Avoid contact with the drum surface. This gap is preferably about 1 Do not exceed a drum angle of 6° or more. Otherwise set the information dropout period to This is because they make it. In the case of recording television signal information, the converter The rotation of 20 and the advance of the tape 42 are performed by the droplets in relation to the information signal being recorded. Defects in the information signal are synchronized so that a drop-out occurs; does not occur during the video information portion and the start of scanning of the track by the transducer 20 occurs during the video information portion. It can be properly field synchronized to the revision signal.

According to the invention, the magnetic transducer 20 is placed along the tape as shown in FIGS. 1-6. It has a long width conversion gap with respect to the track width of the recorded information signal. strange The converter 20 allows the tape 42 to run in a helical path around the tape guide drum 250. is positioned for transmitting information signals relative to the tape 42 during operation. Rotatably mounted upper cylindrical drum of the cylindrical tape guide drum 250 It is rigidly attached to section 252 at its periphery. Generally described above and in detail Transducer 20 is included in transducer controller 112 (FIG. 1), as described below. in conjunction with a saturation control means provided to the converter, which generates a control signal applied to the converter and Magnetically saturate selected areas of the magnetically permeable body of the device to activating and communicating at least one selected width segment of a large conversion gap; The signal winding and magnetics of transducer 20 connected to transducer controller 112 by link 130. Information signals are transferred between tape recording media 42. This control method is Causes the movement of selected width segments along large translation gaps and The transducer 20 is rotated by an upper cylindrical drum portion 252 rotatably mounted thereon. When the conversion is determined by the selected width segment for tape 42. The control signal is varied to move the path traced by the area. this is Rotation of rotatable drum portion 252 defined by rotatable shaft 256 is effective for moving the transducer 20 and associated transducer area in a plane parallel to the axis of rotation. . Furthermore, this is achieved by the saturation control means included in the converter controller 112. can be controlled according to an electrical signal supplied to the transducer 20 via 30 .

If, for example, the relative transducer-to-tape speed is changed, the length of tape 42 The angle of the path traced by the gap in the transducer 20 with respect to the It will be done. The selected width segment and therefore the conversion area of the transducer 2o is the gap of the transducer. If the tape 42 is movable in either direction along the width of the tape, 2,500 revolutions of the tape guide drum in both directions at low speed! can be sent, Meanwhile, the position of the conversion area is such that it stretches at the selected angle with respect to the tape's length dimension. the selected path 126 along the spreading tape 42. It moves me. As discussed above, such alignment control is achieved along the tape 20. Open-loop control without information representing the actual location of the conversion zone with respect to the desired path It can be effective in this manner. Such control is based on the relative transducer versus tape speed, i.e. A tracker that commands the selected movement of the transformation area as predicted by the relative movement speed and direction. by providing a king command signal to conversion controller 112 via communication link 134. can be achieved. This form of control usually means that the conversion area closely follows the selected path. Such as during recording operations, it is only necessary to follow the tape 42. The alignment between the selected path 126 and the conversion zone along the path needs to be controlled with high precision. It is effective in situations where there is no. However, the conversion area and the selected When precise control of alignment between aisles is required, converting zones from selected aisles control signal representing the deviation of the area (this senses the position of the conversion area with respect to the selected path) by moving the transformation area according to Control is preferably performed in this manner.

FIG. 15 shows that the tape is mounted on the cylindrical tape guide drum 250 shown in FIG. A number of tracks A-G as recorded by the transducer 20 as the cycle is sent A segment of magnetic tape 42 with i is shown. The top shown in Figure 15 In rack format, each track is separated by a guard band. No information signals are recorded on these guard bands, and each track separate trucks from nearby trucks. Segments of tape wrap around the drum. Arrows 258 indicate the direction of movement of the tape and the direction of rotation and movement of the transducer with respect to the tape. 260. Therefore, the upper drum portion 252 When rotating in the direction of mark 160 (FIG. 13), transducer 20 rotates as shown in FIG. along the tape 42 in the direction of arrow 160. tape 42 at a constant speed With the drum portion 252 rotating at a constant angular velocity, the tape The path traced by the transducer section 56 (FIG. 1) with respect to the track Matches A-G. These tracks are substantially straight and reeded along the length of the tape 42. parallel to each other at an angle θ (e.g. approximately 3°) with respect to the direction shown in the drawing. Each rightward track continues during successive scans of the tape by transducer 20. Continuation continues.

If the conditions are ideal and no transducer-to-recording-medium motion or positional instability occurs, If the conversion area 56 is Continuous movement that coincides with the next track A-G in close proximity without the need for adjustment of the lateral position of the conversion area. Simply trace the passage. In other words, the conversion area 56 is Track the path along track B that continues after tracking the road automatically positioned to start.

If the feed speed of the tape 42 changes during playback relative to the speed during recording. If instability occurs, such as when the track is played back, the conversion area 56 Must be moved to maintain accurate transducer-to-record track alignment. At the end of the scan of the track being played, the conversion area is If so, the next adjacent downstream track, that is, track Bi, is positioned to start playing. be positioned. This occurs even when the tape is stopped or recorded. This can be achieved even when the signals are sent at a different speed and direction than at the time of recording.

In rotating helical scan tape recording and/or playback equipment, such ideal This condition is often caused by relative transducer-to-recording media movement or positional instability. Interrupted frequently. During recording and playback operations in such a device, the tape 42 , the recording is pulled and guided so that it occurs under a known value of longitudinal tension. . This gives the tape some stretch. If the tension fluctuation is a failure of the tension imparting mechanism. due to or unavoidable mechanisms of different tape recording and/or playback equipment. oblique direction with respect to the plane of rotation of the transformation area 56 if it occurs due to mechanical changes; The length, straightness and slope of the tracks will vary.

Under these circumstances, the conversion area 56 will be able to track a defined track on the tape 42. This is due to fluctuations in the amplitude of the envelope of the playback signal during the playback operation. This results in an undesirable change in the strength of the reproduced signal. a Under such circumstances, a complete signal failure occurs that makes it unusable. Correct tension is maintained The same thing happens if the tape 42 is or undergo expansion and contraction due to changes in storage conditions. Also, irregular tape edges and unevenly curved tracks or scans due to differences in the edge guidance of the machine pair. I feel like it. To this end, when tracing the path along the tape 42 a rotational transformation is required. The path taken by area 56 often coincides exactly with the selected path 126. I don't do it anymore. In practice, the path of the recording track on the tape 42 and the rotation conversion area Even deviations of as little as aooooi inch between the path traced by area 56 will cause playback. This results in a significant deterioration of the quality of the information signal.

In accordance with the present invention, unintentional or unintentional variations in relative transducer-to-tape position can be achieved. graphically induced variations are possible and the conversion area is aligned with the selected path. The alignment is maintained without mechanical deflection of the transducer associated with the magnetic tape recording medium. Furthermore , such alignment is achieved by prior art automatic heads with mechanically deflectable transducers. Dynamic mechanical system parameters characterizing position tracking servomechanisms It is maintained by a simple servo mechanism that does not require compensating the data. Figure 16 shows the conversion along the path traced by the conversion area 56 of the device and the magnetic tape recording medium 42. is applied to the transducer 20 to compensate for deviations between the selected path 126 and the selected path 126. Control current 11. A controller that electronically controls the saturation control circuit 54 to vary I21. 2 shows an example of a circuit forming the locking controller 227; Tracking in Figure 16 The control circuit 227 reproduces previously recorded television information signals from the tape 42. When recording a rotary scan tape recording of the type generally described above in connection with Figures 13-15. The transducer area 56 is located along the width of the transducer gap 26 of the transducer 20 of the recording and playback device. configured to control the location. This tracking control circuit 227 0 is rotated to scan tape 42 at signal transfer location 106. In addition, unintentional and intentionally generated variations in the relative conversion area versus the selected path location configured to compensate for the induced fluctuations. The tracking control circuit 227 Although not shown in FIG. 16 for ease of construction and operation, transducer 20 13 for a tape directed along a helical path around a rotational transducer. and the upper rotating drum portion 252 shown in FIG. It is mounted to rotate.

In the embodiment shown in FIG. 16, selected paths 126 along tape 42 The information representing the location of the conversion area 56 for the selected passage indicates the location of the conversion area 56 for the selected path. relative to the conversion area 56 in the direction of the width of the conversion gap 26 so as to move it laterally. Apply small vibrations and monitor the effect on the signal reproduced by the transducer 20. It can be obtained by In detail, the vibration generator 301 has a constant frequency. Generates a sine waveform oscillation signal of fd and expands it to one input of the adder circuit 303. 302. In the adder circuit 303, this signal is In addition to the tracking position error correction signal present on line 304 extending to the other input of available. Avoiding jamming signal interference with the information signal reproduced by the converter 20 In order to It is operated to provide a sinusoidal oscillation signal.

The output of the adder circuit 306 is ticked by the tracking control signal, which indicates that the selected path 1 26. Determine the location of conversion area 56 relative to 26. This signal is transmitted by line 306. A control current 1 coupled to the saturation controller 570 input and corresponding to the tracking control signal. Make complementary changes in steps 1 and 2. These changing controls are is applied to the control windings 38 and 39 of the converter 20, and according to changes in these control currents, such that the position of the conversion area 56 is moved along the width of the conversion gap 26. do. The oscillating signal components of these changing control currents cause the transducer 20 to 126, when scanning the tape 42 to reproduce the recorded signal, there is an intersection between the limits. small peak-to-peak oscillations or oscillations transversely to the mutually selected passages 126; selected to impart motion to the conversion area 56. This oscillating motion of the conversion zone 56 is , slightly to ensure that it remains substantially within the boundaries of the selected passageway 126. limited to a certain amount. One embodiment of the present invention may be configured to operate. In a logical scan videotape recording device, a recorded television information signal is The width of the truck is CL145mm separated by @076mm guard band. belongs to.

In this application, the oscillating component of the control current signal is transmitted to the next path when the conversion zone 56 is selected. With respect to the center line of the path traced by the conversion area 56 when following 126 vibrate the conversion area 56 laterally with respect to the selected passage 126 by ±α010 mm. selected to do so.

This oscillating or oscillatory motion imparted to the transducer section 56 causes an amplitude modulation of the reproduced signal. This means that when recording television or other such high frequency signals, It is in the form of an RF envelope formed by a frequency modulated carrier signal. Ru. If the conversion area 56 is centered in the selected passageway 126, the Only even harmonic components of the dynamic signal are produced in the reproduced signal as a result of the oscillatory motion of the conversion zone 56. Jiru. Its average position is in the center of the selected passage caused by disturbance and vibration. This is because the envelope change caused by the change in the envelope is symmetrical with respect to its average. tape 42 The amplitude of the RF envelope reproduced from the path 12 in which the conversion zone 56 is selected is It reaches its maximum when aligned above the center of 6. Conversion area 56 on either side of its center When moving to only decreases. In addition, the fundamental components of the vibration signal are balanced and the regenerated RF envelope It does not occur as a component of Therefore, the lateral vibration with respect to the selected passageway 126 By applying dynamic motion to the conversion area 56, the conversion area 56 is When aligned at the center of 6, the amplitude deviation is twice the vibration frequency fd. into the envelope.

On the other hand, if the conversion area 56 is located on either side of the selected passageway 126, The regenerated RF envelope amplitude if offset and matched by Change is no longer symmetrical. Conversion zone to one side of selected passageway 126 The transition in the RF envelope amplitude causes a different RF envelope amplitude reduction, and this This is because it is caused by the transition to . Therefore, the maximum versus minimum envelope amplitude The width change occurs once for each cycle of the oscillating signal, ie at frequency fd, in the conversion section. Maximum and minimum depending on the side of the center of the selected passageway that area 56 is offset. Occurs in the order of occurrence of points. The fundamental oscillating signal frequency is no longer in equilibrium and cannot be regenerated. The selected RP envelope will be offset to the other side of the center of the selected passage. of the center of the selected passageway 126 180° out of phase with respect to The basis of the oscillation signal frequency with the phase of the fundamental component for the offset to one side. It exhibits a main wave component.

Detection of the order of occurrence of the maximum and minimum points, and therefore the phase of the envelope amplitude change, is information about the direction in which the exchange area 56 is offset from the center of the selected passageway 126; Detection of envelope amplitude changes provides information on the amount of offset. This feeling The information determines the tracking position error amount.

The modulated R regenerated by the converter 20 to obtain this tracking position information The F-envelope signal is commonly seen in videotape recording and/or playback systems. The signal is output to the detection circuit by the signal winding 25 via the video playback preamplifier 311. Given. Frequency of carrier with television signal for recording on magnetic recording medium The commonly used process of modulating the output by a preamplifier 311 is This causes a sharp amplitude modulation component to be generated in the envelope of the reproduced signal. these Spurious envelope modulation line transform area 56 along the width of the transform gap 26 addition to that resulting from the intended oscillation of the position. These sugeria components are mainly This results from the non-uniform frequency response of the recording/playback system, resulting in large fluctuations in the envelope of the playback signal. It will affect you. Such spurious components can detect tracking position errors. and if present in the signal processed to correct this error) racking This appears as a position error. To avoid such false tracking position errors The input of the envelope detector 312 is a flat equalizer 610 (which is a color RF autogain commonly found in video recording/playback systems for revision signals television information signal regeneration system at the circuit point between the outputs of the given to. This flat equalizer 310 is preferably a flat equalizer 31 The undesirable amplitude fluctuation of the RF multiplied signal due to the non-uniform frequency response of the part preceding 0 is of the form of a filter with a frequency response complementary to that of this scheme to compensate. It is something.

The tracking position error that changes the amplitude of the reproduced RF envelope is the basis of a vibration oscillator. occurs as a double sideband suppressed carrier (DSB/8C) modulation of the frequency.

Therefore, in order to recover this tracking position signal, a preamplifier 311 is used. The reproduced signal output from the It will be done. The first detector 312 is a simple amplitude modulated RF envelope detector; This is configured to fully recover the fundamental wave of the amplitude signal and its sidebands. en The output signal from the envelope detector 312 is simply a rectified reproduction signal. , includes fundamental and sideband components of the oscillation signal frequency fd.

This output signal is applied to a high-pass filter 316, during which the fundamental components of the oscillation signal are minute and its sidebands, thus passing through the main trucking jig position signal spectrum. It's enough to make it happen. The purpose of filter 316 is to filter the tracking position signal spectrum. undesirable low frequency spurious signals and noise that may be present in the The goal is to attenuate the noise. The output of high pass filter 316 is connected to line 617. It is given to the signal input of the detector 313 of No. 2. This is a synchronous amplitude modulation detector It is a vessel.

A synchronous detector 513 converts the amplitude and polarity of an unknown input signal into a known reference signal of the same frequency. of the type of known design which operates on the principle of coherent detection in relation to the phase of the signal. It is something. Such a detector can handle the amplitude of an unknown input signal and It is positive when the signals are in phase and 7'C is positive when the two signals are out of phase by 180°. gives a rectified output with an amplitude that is negative. Tracking position error signal and by the vibration oscillator 301 to compensate for the appropriate frequency relationship with the reference signal. The oscillating signal provided by It will be done. The signal present on line 317 extending to the signal input of synchronous detector 313 is an error signal. occurs at the location of the conversion zone 56 with respect to the selected path 126. The synchronous detector 313 is connected to the line 318 because it has a component of the signal frequency fd. represents the position error of the conversion area 56 with respect to the selected path 126. Provides a tracking position error signal.

The amplitude of this error signal indicates whether the transducer area 56 is aligned with the center of the selected path 126. It is proportional to the amount of deviation from the The polarity of the tracking position error signal is determined by its deviation from the center. represents the direction of the position.

The output of the synchronous detector 313 is connected to the input of the servo loop auxiliary device 321 via line 318. This auxiliary device 321 is connected to a vibration oscillator servo for optimal loop stability. Gain and phase shift the tracking position error signal to compensate for loop response give. The output provided by the auxiliary device 321 is a tracking position error correction signal. , which, when applied to the saturation controller 54, along the conversion gap 126 causing the movement of the conversion area 56 and the path and selection traced by the conversion area 56. and the selected path 126.

This compensated tracking position error correction signal is sent to the variable speed reproduction servo 324. a summing circuit 32 to be combined with the generated tracking mechanical error correction signal; 3 by line 322. Preferred embodiment of servo 324 will be described in detail below, but generally it is assumed that the speed of tape 42 is, for example, slow motion and other special effects on the reproduction of recorded television information signals; The conversion area 56 and operative to generate a correction signal to compensate for mismatches between selected paths 126; . The output of summing circuit 323 is coupled to summing circuit 303 by line 304; Here, it is added to the oscillation signal provided by oscillator 301. Complex beliefs resulting from this The signal is provided by line 36 from the output of adder circuit 303 to saturation controller 54. . Saturation controller 54 receives a composite control signal applied to control windings 38 and 39 of modulator 20. No. 1 and ■2 are generated. The tracking position signal component of the composite signal is detected by a synchronous detector. The width of the gap 26 according to the tracking position error signal detected by 313 , thereby adjusting the position of nine transformation zones 56 along the selected path 126. transducing area 56 laterally to maintain alignment.

Information representing the location of the conversion zone 56 with respect to the selected path 126 along the tape from which a tracking position error correction signal is generated and provided to the saturation controller 54. The circuit is one of several configurations preferred for such purposes. example For example, by intentionally moving the conversion area 56 in the direction of the width of the conversion gap 26, examine the effect of its movement on the amplitude of the information signal and vary it according to the result of the examination. Trial and error techniques involving varying or continuous movement of the exchange area may be used. can be used. These steps allow movement of the transducer area 56 in any direction by the transducer 20. repeated until it has the effect of reducing the amplitude of the information signal reproduced by . Other technologies that obtain such position information and generate tracking position error correction signals makes use of a tracking signal previously recorded along the recording medium 42. be In applications, these tracking signals are used to identify tracks on which information signals are to be recorded. is pre-recorded along a special dedicated track in close proximity to the following. of the signal information converter 20 one or more auxiliary trucks coupled to move with conversion area 56; The tracking transducer is positioned to detect the prerecorded tracking signal. It will be done. This detected tracking signal follows the position of the auxiliary tracking transducer. is processed to determine an information signal conversion area 56 for the recording medium. Other responses In applications, the prerecorded tracking signal is placed along the same track as the information signal. is prerecorded at a frequency outside (usually below) the frequency band of the information signal. Supplementary The auxiliary tracking transducer generates a prerecorded track along the same track as the information signal. It is not necessary to detect the king signal. Instead, a signal information converter 20 #'i Next used to reproduce both the information signal and the tracking signal, the frequency A selection filter is provided to separate these two signals.

represents the location of the conversion zone 56 relative to the selected path 126 along the recording medium 42; A corresponding tracking position error correction signal is sent to the saturation controller 54. Other techniques that generate the issue from it are previously recorded hole information with an auxiliary tracking transducer. Based on detecting signals. This auxiliary tracking detector is by conversion area Tracing the passage along the recording medium 42 corresponding to the center line of the passage to be traced is linked to move with the conversion section 56 of the signal information converter 20 so as to . As will become clearer from the description below, in order to detect previously recorded information signals, The use of two auxiliary tracking transducers to detect and address tracking position errors This facilitates the generation of error correction signals. Determining the location of the information signal conversion area 56 Any auxiliary tracking transducer configuration capable of an auxiliary tracking transducer having a movable transducer area similar to that of transducer 20; The use equates the movement of these auxiliary tracking transducers with the movement of the information signal conversion area 56. Make it easy to meet your expectations. The path to be traced by the conversion area 56 and selected converting section 56 of information signal converter 20 in compensating for deviations between Auxiliary tracking converter conversion area to be used for moving The same tracking position error correction signal may be used to cause the movement of synchronization is easily realized. Furthermore, Sections 18A, 18B and 1 As described below in connection with 8C, the information signal converter and the auxiliary tracking converter are A preferred embodiment of the one-piece transducer structure 420 defines a selected path along the recording medium. The conversion area position is determined from the information signal recorded on the recording medium 42 at a position close to the path 126. Particularly preferred for use with circuits for obtaining information.

Determine and saturate the tracking position error signal by using an auxiliary tracking transducer. A circuit for generating a corresponding tracking position error correction signal to be applied to the sum controller 54. A preferred embodiment of the channel is shown in FIG. Regarding Figures 18A, 18B and 18C As will be described in conjunction with this circuit, this circuit is used in the conversion section 56 of the information signal converter 20. A pair of left offset and right offset auxiliary tracking transducers located on each side 150a and 150b. These auxiliary trackers The conversion transducer continuously monitors the lateral track position of the conversion area 56 and used to provide information used to control the lateral position of the area. child In the embodiment, one of the auxiliary tracking transducers 150a and 150b is selected the respective left and right offsets along the tape 42 associated with the path 126 positioned on each side of the conversion area 56 to trace the offset path. . The auxiliary tracking transducer is positioned relative to the information signal transducer 20 and transmits information. The conversion area 56 of the signal converter is connected to the selected path 126 (from which the information signal is regenerated). of the auxiliary tracking transducer when centered with respect to The conversion area is located at either the edge of the selected passageway 120 or the selected passageway 126. Gartband on the side (if present) or adjacent to the selected passageway 126 according to any of the tracks of the recorded information signal. Conversion area 56 is selected during recording operation. Auxiliary tracking variables are used to maintain the desired position with respect to the selected passageway 126. The converter preferably allows the information signal converter 20 to be renewed along the selected path 126. When a new information signal is recorded, a conversion area is used to play back the previously recorded information signal. By positioning two auxiliary tracking transducers on one side of the The signal converter reproduces previously recorded information signals on adjacent tracks. It is configured. Preferably, the auxiliary tracking transducer is such that the transducing area 56 contains information. along the tape 42 that coincides with the centerline of the selected path 126 that is transmitting the signal. reproduced by the auxiliary tracking transducer while properly tracing the path must be positioned with respect to the conversion area 56 such that the amplitudes of the signals transmitted are equal. Must be.

Auxiliary tracking transducers 150a and 150b determine the amplitude of the signal envelope. They are information signal converters because all that is needed is to give a signal that can be It does not need to be of the same performance or type as device 20. However, auxiliary tracking converters 150a and 150b are used to obtain the most accurate position information. , it is desired to have good performance.

Embodiment of 7'CI piece transducer structure 420 shown in FIGS. 18A, 18B and 180 , traced by auxiliary tracking transducers 150a and 150b. as the passageway is laterally deflected to maintain alignment with the selected passageway 126. always with the edges of the path traced by the conversion section 56 of the information signal converter 20. Overlap. The path traced by the conversion area 56 is along the selected path 126. auxiliary tracking converter 1. 50a and 150b as they move with the conversion section 56 of the information signal converter 20. The information signal is regenerated from the edge that overlaps the selected passageway 126. As another aspect , the conversion areas of auxiliary tracking transducers 150a and 150b are connected to conversion area 56. thus having only a small overlap for the selected path 126 being traced. The width of the conversion area 56 of the information signal converter 20 should be adjusted so that the entire body does not overlap. The width may also be narrow. However, the auxiliary tracking transducer 15 The conversion zones 0a and 150b are preferably conversion zones 5 of the information signal converter 20. 6 is correctly aligned with the selected path 126, the track of the recorded information signal is does not extend laterally beyond the dimensions of the guard bands on the common sides of the rack. follow The tracking is performed by the auxiliary tracking transducers 150a and 150bij transducer section 56. Information signals are typically received from recording tracks proximate to the selected path 126 being raced. will not be played. In either case, an auxiliary and information signal converter 150a.

150b and 20 are, for example, transducer-drum assembly 250 (FIGS. 13 and 14). ), which are supported by an upper rotating drum section 252, which Do not extend beyond the perimeter of the drum assembly 250 to ensure a clean interface. Crab protrudes.

In the circuit of FIG. 17, the information signal converter 20 is configured as shown in FIG. Operates to reproduce information signals from a tape with 7 ohms + t- The conversion area of the two auxiliary tracking transducers 150a and 150b when is the selected path on which the information signal is being regenerated by the conversion section 56 of the converter 20. 126 from both edges 125 and 135, respectively. each The signals reproduced by tracking transducers 150a and 150b are connected to tape 42. is given from the information signal recorded on the by any tracking transducer The instantaneous amplitude of the reproduced signal is the track and track of the recorded information signal at a given moment. Depends on how close they are. If the tracking transducer is in close proximity to the recorded information signal, If the guard bands between the tracks are completely overlapped, the signal amplitude will be extremely small. However, if it overlaps with a considerable part of the track of the recorded information signal, , the signal amplitude is relatively large.

Each of the tracking converters 150a and 1sob has its signal winding 25a, 25b is connected to preamplifiers 452 and 454 and reproduced by each The desired level of the signal required for processing by the tracking control circuit 227 is It is widened to the bell. provided by each of the preamplifiers 452, 454 The amplitude level of the reproduced signal is detected by rectifiers 456 and 458. truckin' The signals reproduced by the converters 150a and 150b are transferred to the recording medium as a television Changes in the carrier due to the information signal that would normally occur when recording the information signal It may contain some kind of shaking liquid i based on the key. Tracking position with error The determination of is the result of such modulation. To avoid such errors, it The output of each rectifier 456, 458 is connected to sample/hold circuits 464, 466. Given. Each circuit has an associated hold coupled between its output and ground. It has capacitors 472 and 474i. Sample/hold circuits 464 and 466 operation, the effect of modulating the carrier can introduce errors into the tracking position determination. The signals received from preamplifiers 452 and 454 are periodically Controlled to sample. In television information signals, this It may also be during the period of a horizontal synchronization pulse that occurs in such an information signal. period like this The information signal converter 20 applied to the signal winding 25c in order to determine the occurrence of The output is provided to a preamplifier 476.

This output is then provided to a demodulation and synchronization signal separator 478. Separator 4 74 is designed to completely separate the horizontal synchronization pulse from the reproduced television information signal. Revision signal operates at horizontal line speed. This separator 478 outputs The horizontal sync pulse is sent to the sample/hold circuit via signal lines 463 and 465. 464 and 466 so that they are commutated during the horizontal sync pulse period. 456 and 458. this is, Tracking transducers 150a and 150b form the transducing section 56 of the information signal transducer 20. edges 125 and 135 of the selected passageway 126 traced by tracking transducers 150a and 150b during the entire tracing period. is the result of the output given by being sampled periodically at the horizontal line rate.

This mode of sampling introduces amplitude modulation interference to tracking position error determination. reduce the possibility of Frequency modulation for recording television information signals is based on water. This is because it does not affect the flat synchronization pulse.

Samples stored by holding capacitors 472 and 474 The pulling signal amplitude level determines the tracking position error of the transducer zone 56 of the transducer 20. and are applied to separate inputs of differential amplifier 460. These capacitors The sampling signal amplitude level recorded by the differential amplifier 460 is 2 produced by tracking transducers 150a and 150b. An error voltage proportional to the tracking position error represented by the two signals is generated. I can't stand it. This voltage is provided by tracking transducers 150a and 150b. It is in the form of an output difference signal with an amplitude proportional to the difference in average amplitude of the signals , whose direction represents which average amplitude is the largest. Conversion of information signal converter 20 Tracking occurs when area 56 is aligned in the center of selected passageway 126. The average amplitudes of the signals produced by transducers 150a and 150b are equal. stomach. Therefore, the output signal provided by differential amplifier 460 is either zero or or the desired location of the conversion area 56 with respect to the selected passageway 126.

However, if the conversion area 56 is, for example, left offset tracking converter 150a When the transducer is deflected from the center of the selected passageway 126 in the direction of The average amplitude of the signal produced by The average amplitude of the signal produced by racking transducer 150b increases proportionally. make it big Translation area 56 is selected in the direction of right offset tracking transducer 150b The opposite occurs when the passageway 126 is deflected from the center. That is, The average amplitude of the signal produced by racking transducer 150a increases proportionally. on the other hand, the average amplitude of the signal produced by tracking transducer 150b is correspondingly reduced. Therefore, the tracking control circuit 227 A 1-difference signal is generated in response to a proportionally changing signal, and its amplitude is determined by tracking conversion. track the amplitude difference of the signals reproduced by the receivers 150a and 150b, and The direction depends on which of the signals is the largest. This difference signal is sent to the information signal converter 20. 16 represents the tracking position error of the conversion area 56 and the tracking position error of the embodiment of FIG. Conversion area 56 and selected passageway 126, as described above in connection with the switching control circuit. tracking provided to saturation controller 227 to compensate for misalignment between Inverted to form a position error correction signal.

Composite information signal converter 20 and two edge-assisted tracking converters 150a and 1 A preferred embodiment of the one-piece transducer structure 420 defined by 50b'i is shown in FIGS. 18A and 18B. is shown.

One half of the composite transducer structure 420 is shown in FIG. 18A, with the front core 4 00 and a back core of 400. These are designed to reduce air gear lag, for example. The abutment surfaces 402 and 403 are integrally connected to each other by epoxy bonding.

This frontal core is preferably made of a single crystal magnetic 7-elite material such as PS52B. made from blocks. The groove 404 has a width dimension W of the front core so as to obtain a conversion winding window. The rear of the front core 401 inwardly with respect to the transformation gap plane 406 extending in the direction of formed on surface 403. The back core 401 has a thickness of, for example, 0.0001 inch. A plurality of U-shaped magnetically permeable thin laminates 407 are individually stacked, Boundary length dimension that varies with respect to the position of surface 408 in contact with tape 42 (FIG. 17) have a relationship. If a thinner laminate 407 is desired, e.g. Further material deposition such as vapor deposition (sputtering is a preferred example), plating, etc. The collars are used to form a laminate, each several microinches thick. I can do it. Additionally, the laminated structure is magnetically permeable from a single block of material. If the surface core 401 is configured as described below, between three transducers in close proximity, If magnetic isolation is desired, it may be constructed from three integral blocks of such materials. 7401) by aligning this block to form the back surface; can be completely replaced. How the back core 401 was formed Regardless of whether the U-shaped structure of the back core is An open winding window 409i is preferably defined that extends circularly relative to surface 402. Details below As will be described in detail, the window 409 and the three windows forming the tl composite transducer structure 420 Control signal winding g of converters 20, 150a and 150b 38a, 38b, 38 C, 39a, 39b and 59Gf are provided to pass through the back core 401.

The combined front and back cores 400 and 401 form a composite transducer structure 420 One of the two half-cores 414, 416 (FIG. 18B) is full-bottomed. 1st Each half-core 414°4 of the composite transducer structure embodiment of FIGS. 8A and 18B Each of the 16 laminates has a control panel extending in the laminate plane as shown in Figure 1aB. It has a substantially constant width 411 in a direction perpendicular to the magnetic flux path 412 . adjacent halves Laminated body 407 of cores 414 and 416 ij in the direction indicated by arrow 413 The length of the half core 414 increases in the direction of the half core 416. It increases in the opposite direction with respect to the width dimension W of the conversion gap 26. This is a compound variable. In each half core 414, 416 in the direction of the width dimension W of the transducer structure 420, The length of the controlled flux path increases in the opposite direction, thus increasing the relaxation form a tans gradient.

This increase is preferably related to other embodiments of transducers implemented in the present invention. is logarithmic to maximize the permeability versus flux density gradient as described above. .

Separate information signal converter 20 and two edge-assisted tracking converters 150a and 150b of non-magnetic material such as copper to provide greater magnetic isolation between A pair of insulating spacer stacks 417 are placed on the front core 400 and back core 401 . The insulating spacer stack 417 extends the length of the composite transducer structure 420 and is elongated. A one-piece transducer structure of dimension W is attached to the information signal transducer 20 and two edge auxiliary trucks. Three equal width magnetically insulated blocks forming the locking transducers 150a and 150b placed within the core so as to divide it into divided parts. This insulating spacer laminate 41 7, they are shown in a dotted pattern in FIG. 18A. Non Magnetic spacer stack 417 forms integral front and back core structures 400 and 401 By forming a magnetically permeable laminate, e.g. 4D7 and a corresponding portion of the front core 400. magnetically permeable product As discussed above in connection with laminate 407, spacer laminate 417 is machine formed and its The magnetically permeable laminate is post-processed to form a composite transducer structure 420. assembled with body 407 and a portion of magnetically permeable frontal core 400; It can be configured as follows. However, the spacer laminate 417 is treated with anti-adhesion treatment. The magnetically permeable laminate 407 and the front core 400 are formed in close proximity to each other. It can also be done.

The two half-core structures 414 and 416 have a control flux path 412 therein. gradually increases in the opposite direction across the width dimension W2 of the composite transducer structure 420. They are assembled together so that they fit together. These gradually increasing and oppositely directed magnetic fluxes The length of the passage has a corresponding reluctance gradient extending in opposite directions across the width dimension W. Set. The half cores 414 and 416 assembled in this way are made of epoxy. are connected to each other at the gap plane 406 and thus create the fc composite transformation The vessel core structure 420 has a desired surface outline and a desired depth relative to the conversion gap 26. The surface 408 is contoured to obtain a transducer structure. After that, the control signal winding 5Ba, 38b, 5Bc, 39a, 59b and 59c and conversion signal winding Lines 25a, 25b and 25c are arranged around half cores 414,416. strange Each one of the converter signal windings 25a, 25b and 25c connects the three converters 20. Magnetically effectable stack 407 to form one of 150a and 150b wrapped around 9 in one stack. These windings are close to the gap plane 406 each winding is formed on the rear surface 403 of the front core 400. groove 404 and a shock formed along the width dimension of the stacked nine-sided core 401. 418 (FIG. 18A). More specifically, the signal winding 25a is The signal winding 25b is wound around the auxiliary tracking converter 150a. The signal converter 25c is wrapped around the information signal converter 150b and the signal converter 25c is the information signal converter 20 wrapped around 0. Easy to wrap signal windings around each of the three converters In order to 5C from the side of the aft surface 403 of the transducer structure 420 to the rear section of this structure. The gap is flat in the winding hole 419 so that it can pass through to the side of the winding hole 418. A slot is formed along the length of the spacer stack to form surface 406 .

Three transducers 20, 150a and 150b transducer area position and information signal transducer Compensation for deviations from the selected passages 126 of the 20 conversion zones 56 (FIGS. 16 and 17) Separate control signal windings 38 provide synchronous control of movement of the conversion zone for compensation. a, 38b, 38c, 59a, 39b and 59c are 18A and 18B This is required in the embodiment of transducer structure 420 shown in the figure. For details, , the two half core parts forming the auxiliary tracking transducer 15Ga f are It has control signal windings 38a and 39ai respectively wrapped around it. Similarly, The two half-core portions forming the auxiliary tracking transducer 150b are control signal windings 3Bb and 39b respectively wound on the signal converter 20; have control signal windings 38c and sqc wound respectively around them. Ru. In order to be able to wrap the control signal winding around the half core part, Non-magnetic spacer laminate 417 is slotted in the direction of dimension 411 and has a laminate configuration. A winding hole 421 (FIG. 18A) is formed on the surface of the back core 401.

Each of the six transducers 20, 150a and 150b of composite transducer structure 420 individually determines the desired oppositely oriented reluctance gradients in the pair of core halves. , but the slopes associated with these three transducers have different ranges of extends over. Therefore, different magnitudes of the control current are applied to the converters 20, 150a and and 150b and the desired selective selection of the three transducer areas. Saturation and displacement of the saturated region for a given distance in the direction of the width dimension W of the conversion gap 26 movement is carried out. 18A and 18B as a composite transducer structure. The 420 embodiment provides separate controlled current sources and therefore saturation for each of the three converters. A sum controller 54 (FIG. 17) is required. A separate saturation controller is required, but The same tracking position provided by the tracking control circuit 227 of FIG. The three transducers 20, 15 are provided with a position error correction signal for each of them. 0a and 150b conversion area position control and synchronized movement You can make it so that However, as will be discussed later in connection with Figure 18C. , separate saturation for each of the three converters 20.150a and 150b. The controller 54 requires that each section have the same and oppositely oriented reluctance. Suitably configuring the three parts of the two half-cores 414 and 416 to exhibit a slope. This can be avoided by doing so.

In each of the three transducers 20, 150a and 150b, a substantially A constant cross-sectional area is maintained in the direction perpendicular to the control flux path 412 and the control flux path The length of increases differentially or gradually in opposite directions in the opposing core halves. So The face 408 of each transducer saturates before the back core 401 portion of the stacked configuration. In order to provide a The defined width 422 (FIG. 18A) of the front core 400 preferably defines the width of the magnetic flux path 41 The width 411 of the laminate 407 forming the back core 401 that defines the stop of 2. Crabs are made small. Control flux path 42 across each transducer face 408 For a constant cross-sectional area of the frontal core 400 perpendicular to the direction of 4 (FIG. 18B), Each area of the front core 400 that is consistent with the laminated configuration of the back core 401 has an associated The control signal current of the control winding corresponds to the saturation magnetic flux density for the front core 400. When setting the magnetic flux level in the magnetic flux path of the matched stack structure, the range is determined by surface 408. uniformly saturated throughout the area. Transducer structure 42 shown in Figures 18A and tsB 0 embodiment, each of the laminates of the back core 401 has magnetic contact with the next laminate in its proximity. However, the joint between these laminates magnetically connects the back core of the laminate structure. It has the additional advantage of being anisotropic and having the easy axis of magnetization in the lamination plane. this is The saturation and unsaturation along the conversion gap that can be obtained in the non-laminated part of the corresponding structure It makes it possible to achieve better discrimination between saturated parts, ie sharper boundaries or transitions.

FIG. 18C shows the information signal converter 20 and two auxiliary trackers of the composite converter structure. control the position and synchronized movement of the conversion zones of converters 150a and 150b. of the composite converter structure 420 that allows the use of the signal saturation controller 227 to Figure 1 shows one half of the example. Transducer structure 42 shown in Figures 18A and 18B In the case of 0 embodiments, two auxiliary tracking transducers 150a and 150 b are assembled on each side of the information signal converter 20. however, This embodiment of a composite transducer structure 420 is shown in FIGS. 18A and 18B, and the fc implementation This is very different from the example. In the case of the embodiments of Figures 18A and 18B, it Two cores from the minimum length on one side of each half core to the maximum length on the opposite side. Instead of varying the length of each half, in the embodiment of FIG. 3 of each of the half-cores defining one of the two transducers 20.150a and 150b The lengths of each of the two parts are made to vary from the same minimum length to the same maximum length. Ru.

In more detail with respect to FIG. 18C, half core 416 has three sections 42 6.427 and 428, which are connected to three converters 150a, 20 and 428. and 150b't--other not shown half-cores (18th (corresponding to half-core 414 in Figure B). converter 150a, 20 and 150b (7) each of the portions 426, 427 and 428 that define one This ranges, for example, from the minimum length on one side 429 of the half core portion 426 to the opposite side. It has a length that can be varied in the direction of arrow 413 up to a maximum length at 431 .

The length of each of sections 426, 427 and 42B is preferably the same reluctor set therein in the direction of the width dimension W of the composite transducer structure 420. It can also be varied to have a gradient. Forming the transducer structure 420 The length of the two half cores joined so as to be related to the width W of the conversion gap 26. increases in the opposite direction.

This corresponds to each of the two half-cores in the direction of the width dimension W of the composite transducer structure 420. The controlled magnetic flux path length increases in opposite directions at forming a ctance gradient. Embodiment of transducer structure 420 of FIGS. 18A and 1sB In this case, this increase is preferably such as to maximize the permeability versus flux density gradient. It is a logarithmic function.

The three parts 426, 427 and 428 of each of the two half-cores are The applied control current forms a transducer structure 420 with a full tangent gradient. The level and its variations set the same flux conditions in each of these parts . Therefore, there is only one set of composite control currents 1 and I2 (Fig. 17), and therefore saturation control The device 54 includes the five transducers 20, 150a and 150 of the composite transducer structure 420. b Required to control the position and movement of the teno conversion area.

In this embodiment, the conversion gears of all three converters 20, 150a and □150b The position and movement of the conversion zone along the width dimension W of the cap 26 is automatically synchronized. It will be done.

The conversion zones of all three converters can be controlled by a set of control currents. so that each half-core of composite transducer structure 420 has only one control signal winding. Requires a line. As shown in FIG. 18C, one control winding 39 has a half-core Open winding window 409 extending through all three sections 426, 427 and 428 of 416 wrapped around the entire structure 4200 through the 150a and 150b. Composite converter structure 4 The other half-core not shown forming 20 has a single control winding 38 (FIG. 17). ) is similarly wound. In operation, these two windings have a single saturation control three transducers 2 coupled to the output of the transducer 54 and along the width dimension W of the transducer gap 26; 0.150a and 150b of the combined control current that determines the position and movement of the conversion zone. receive.

Otherwise, the embodiment of composite transducer structure 420 shown in FIG. 18C is similar to that shown in FIG. 18A. and 18B. Each core half is monolithic. That is, it consists of a single crystal front core 400 and a back core 401, and these cores are made of epoxy resin. They are joined pairwise to each other by a bond. In the embodiment shown in Figure 18C , each half core portion 426.427.428 ij of the back core 401, Constructed from a single block of magnetically permeable material, these three parts are rigid They are joined together, for example by epoxy bonding, to form a rigid structure. death However, each of these half-core sections consists of an overlapping layer of magnetically permeable laminates. It should be understood that it can be formed as Composite converter structure in Figure 18C Embodiments of structure 420 include magnetic fields between adjacent half-core portions 426, 427, and 428. (Such a layer may be provided if necessary) D This result As a result, the frontal core 400 is constructed from an integral body of magnetically permeable monolithic material. configured. Not shown in Figure 18C, but shown in Figures 18A and 18B corresponds to the signal windings 25a, 25b and 25C of the embodiment of the composite converter structure 420. The separate signal windings for the three transformations are shown in dotted lines 435 and 434 in FIG. They are provided for each of the containers 150a, 150b, and 20, respectively. 1st Similar to the composite transducer structure 420 of Figures 8A and 18B, the signal winding is connected to the transducer gap. Around the frontal part of the half core parts 426, 427 and 428 in close proximity to the plane of 26 (appropriate winding holes are provided in the half core part for this purpose) and the front core In the groove 404 at the rear of the rear core 400 and in the shoulder 418 formed in the back core 401. Given.

Front and back cores 40 of the embodiment of composite transducer structure 420 shown in FIG. 18C The mechanical dimensions of 0 and 401 are those of the embodiment shown in Figures 18A and 18B. The same is true. In more detail, half core portions 426, 427 and 428, respectively. has a substantially constant cross-sectional area in a direction perpendicular to the control flux path 412. Change The width 422 of the front core 400 preferably accommodates three transducers 150a, 150 The surface 408 associated with each of b. In order to make it more saturated, the back core 401i forms a half core portion 426.4. The width 411 of 27 and 428 is made slightly smaller.

A composite transducer structure 240 constructed according to the embodiment of FIG. 18C has a single saturation limit. The control signal winding 54 (FIG. 17) and the set of control signal windings 38 and 39 are included in the structure 2400. Control of the positioning and movement of the transducer areas of all transducers 20.150a and 150b However, in some applications, the transducer 20.1 Provides separate control of position and movement of each conversion zone for 5Da and 150b It is desired that Such separate control can e.g. allows individual phase and gain compensation of the associated control signal path. each To provide such separate control of the location and movement of the transformation area, the discriminant pair constraints are A control signal winding is provided for each of the five converters. Control signals for these pairs The windings are related to the embodiment of composite transducer structure 420 shown in FIGS. 18A and iaB. Three portions 426.42 of composite transducer structure 420 in the same manner as described above. 7 and 428 are distributed and wound around the circumference of the back core. 3 converters Separate phase and gain compensation of the control signal path associated with each of the saturating controllers 5 4 (see Figure 17) with a suitable compensation circuit in the control signal winding extending from the This is achieved by placing a path.

That of the embodiment of composite transducer structure 420 shown in Figures 1aA, 1sB and 18C. In each case, the material of the monolithic front core 400 is different from that of the back core 401 having a laminated structure. It has the additional advantage that it can be made of any other materials. For example, frontal core material is in the plane of the transducer gap 26 such that the easy axis of magnetization further improves the confinement of the transducer area. 18A, 18B and 180 of the vertically oriented transducers of the embodiments of FIGS. As is clear from comparing the converters of the embodiments shown in Figures 5 and 6, the Oppositely oriented abutment core halves (18th A) with increasing controlled flux path lengths , 18B and 18C) the gradual saturation of the wedge shapes oriented in opposite directions This is analogous to saturating a portion (the embodiment of FIGS. 5 and 6). For this reason, the tth The operation of the converter of the embodiments of Figures aA, tsB and 1aC and Figures 5 and 6 is as follows: The surfaces are differentially saturated on both sides of the transducer gap 260 and along the transducer medium dimension WK, It is similar in that it forms a large permeable conversion area that can be moved. . However, the transducer embodiments of Figures 18A, f8B and 1aC are If the surface 408 of the section is not only a part of it, as in the transducer embodiment of FIGS. It differs in that it is not saturated along its entire length.

As discussed above in connection with FIG. 16, the preferred tracking control circuit 227 of the present invention In a preferred embodiment, the information signals are transferred to a tape recording medium at different relative transducers versus tape transport speeds. 42 and the location of conversion area 56 so that information signals can be transferred with respect to It has an operation mode that controls movement. This mode of operation is typically If the playback speed and feed direction are different from the normal recording and/or playback speed, from the television T+V signal that is played from tape 42 when being sent at a low speed. and used to create other anomalous motion effects. During this mode of operation, the The position and movement of switching area 56 is controlled by variable speed playback servo 324 at various tape advances. It is controlled with 9-speed concealment in mind. Once the tape 42 feed rate and direction are selected and servo 324 cooperates with other circuitry of tracking controller 227 to control transducer 20. automatically controls the position of the transducing area 56 along the transducing gap 26. This control transform area 56 when tracing the selected path from its beginning to its end. is maintained consistent with the selected path 126 of recorded information and the selected path At the end of the tracing of the path, the location of the conversion area is determined by the recorded information signal to be subsequently played back. is executed as adjusted at the beginning of the appropriate track of the issue.

Servo 324 controls the translation of transducer 20 as selected path 126 is traced. Gradual transverse movement of conversion zone 56 along gap 26 and selected passage 126 Selective transverse reset of the transformation zone in the opposite direction to the gradual movement direction at the end of the trace automatic motion. This reset movement is a reset movement of the conversion area 56. recording information separate from the track along the tape as next traced in the absence of The conversion area 5 at a location along the conversion gap 26 corresponding to the start of the track of the signal. Km functions to position 6. Along the width of the transducer gap 26 of the transducer 20 The decision to adjust the position of the conversion area 56 depends on the operating mode of the recording and playback device and is within predetermined limits that can be achieved by transducer 20. Depends on whether. If the conversion area 56 is the width of the conversion gap 26 of the converter 20, If it is at one of the ends, it cannot be moved any further in that direction. Conversion area The overall travel range of area 56 is determined by the width of transducer gap 26 of transducer 20. selected to be within practical limits.

A preferred embodiment of a variable speed regeneration servo 324 is shown below with reference to FIGS. 16, 19 and 20. It is explained as follows. This allows converter 20 to transfer signal transfer location 106 at various speeds and When reproducing recorded television information signals from tape 42 fed in different directions The position and movement of the conversion area 56 is controlled by the controller. Recording and playback equipment When the tape 42 is in the stop motion playback mode, The process will be stopped. When the tape feed is stopped, the tape 42 The angle of the path traced by the conversion area 56 with respect to The angle of the track is different. Therefore, the conversion area 56 is from one track to In the process of reproducing the information signal, keeping it aligned with the track and each reproduction then move it to reposition it for another trace of the same track. must be In this stationary motion mode, the conversion zone 56 typically is the scene represented by the television signal information in which the conversion area is repeatedly played. Repeat the same track as many times as required for the desired duration of display. at the end of each trace of the track being played. It is moved along the translation gap 26 to reset its position. subordinate Therefore, the information signal recorded on this track is the result of a stationary tape. It will be played many times. Repeated reproduction of each recorded television signal information During the conversion zone 56, the tape is transported in the opposite direction to that for normal recording and playback operations. It is gradually moved along the conversion gap 26 in a direction corresponding to the vertical direction. child The total movement in the opposite direction is the track center-to-track center spacing of one of the recording tracks. d (Fig. 15). Therefore, the conversion area 56 replays the same track. Each trace of the track to be precisely positioned to trace shall be reset by the distance corresponding to the opposite direction, i.e. the forward direction. Therefore, as transducer section 56 rotates with transducer 20, it moved along the width of the translation gap 26 to maintain track alignment; one track to be positioned to start retracing the same track. The track spacing distance d is reset at the end of that trace of the track.

In Figure 20, conversion area tracking geometric reset deviation control current waveform diagram 701 is shown for a stop motion mode of operation, along a selected path 126. A single field of recorded television information allows for the display of still images. It is played repeatedly as follows. This waveform includes a ramp along with a reset portion 706. portion 704 and generally includes a reflection of the television information signal from the selected path. To maintain conversion area 56 in alignment with one selected path 126 during replay. represents the waveform required for the purpose. Ramp portion 704 extends along conversion gap 26 into a conversion area. The recorded information as it is traced to move through the area 56 and thereby reproduce the signal. Provided to keep the conversion area aligned with the track of the signal. Reset part 706 is a converting gear in the opposite direction to that produced by ramp portion 704. move the conversion area 56 along the map 26 and retrain the same track again. of each trace of the track to position the conversion area to will be given at the end. Repetitive tracing of one track, thus A controlled current wave is used to repeatedly reproduce the television information signal recorded on the Shape 701 represents one of the repeatedly played tracks of a recorded television information signal. a period having a period defined by a reset portion 706 corresponding to the period of regeneration; It is generated as a ramp signal that occurs automatically.

The tape 42 is fed forward at a speed that is, for example, seven times the normal recording and playback speed. Conversion area reset excursion control current waveform for slow motion operating modes such as is similar to waveform 701 for the stop motion operation mode. However, the control voltage The duration of the flow ramp portion 704 is different. Topping of tape 42 by conversion area 56 Instead of the reset portion 7060 occurring at the end of each race, the conversion area 56 causes . Between successive resets of the conversion area 56 along the conversion gap 26, the conversion area , the angle that would otherwise be traced along the tape 42 and the recorded information signal on the tape. Transform the gap according to a ramp function to account for the difference between the track angle and be moved along. This occurs between consecutive reset portions 706. The conversion area 56 continues to trace two adjacent tracks during rotation. is possible. The conversion area 56 is continuously moved along the conversion gap in this manner. By doing so, the recorded television field sequence will be recorded twice over the same field. The tape 42 is played back in the same manner as the playback.

On the display, this sequence is the same as the one represented by the recorded television information signal. Creates a slow-motion effect that corresponds to normal motion.

Other slow motion effects can be created as well, and the speed of this motion effect is How many times a recording field is played repeatedly and how many times each field is played repeatedly. It depends on how you are born. In any slow motion mode of operation, That is, at any tape forward speed between the normal speed and the stop speed, the conversion area The set deflection control current waveform is similar to waveform 701. The only difference is that The duration of the controlled current ramp portion 704 is defined by the set portion 706 .

This period is inversely proportional to the feed rate of tape 42.

In the 2x normal fast motion mode of operation, the tape 42 is used for normal recording and playback. forward through the signal transfer location 106 (FIG. 16) at twice the speed . For this reason, a wide range of information signal tracks are provided by the conversion area 56 during this mode. When tracing, the recorded track being traced will separate adjacent trunk centers. The signal is transferred by the forward chive feeder by a distance corresponding to the distance d (Fig. 15). You can proceed beyond the sending location. Therefore, alignment is achieved between the conversion area 56 and its tracks. In order to maintain, the translation area is moved forward by a corresponding distance during the trace of that track. It must be moved along the conversion gap 26 in the direction corresponding to the directional tape feed. Must be. Twice as fast motion records the normal feel of a television signal television formatted at standard speed i.e. according to NT8C525 standards. For the signal, this is achieved by reproducing every other recorded track at 60H2. be done. Each tip of a track is moved by a distance corresponding to the spacing between adjacent tracks. A change along the conversion gap 26 in a direction corresponding to the reverse tape feed direction at the end of the race. By resetting the position of conversion area 56, conversion area 56 is Close downstream tracks that would otherwise be traced (this is the (including the next field in the John field recording sequence).

Instead, the conversion area 56 contains two traces from the track that just finished tracing. The recorded track is arranged to trace the track being positioned.

This track to be traced contains the second next field of the sequence.

By continuously moving the conversion area 56 along the conversion gap 26 in this manner, So every other recorded television field sequence is on tape 42. This is played back from the broadcast, which is represented by the recorded television information signal on the display. Creates a high-speed movement effect that corresponds to twice the normal movement.

This doubles the conversion area reset excursion control current wave for normal high speed motion operation mode Shape 707 is shown in FIG. As is clear from this figure, the waveform 707 The slope of ramp portion 708 is for stationary and slow motion modes of operation. is the opposite. This is maintained consistent with the track being traced as described above. movement and movement required for stop and slow motion modes of operation to maintain unless the conversion area 56 is moved along the conversion gap 26 in the opposite direction. It happens because it doesn't happen.

For the same reason, the reset portion 709 for waveform 707 provides stop and slow motion. The direction is opposite to that for the on mode of operation.

The tape 42 is advanced at a speed between the normal recording and playback speed and twice this speed. In any fast motion operating mode, such as when the tape is being fed in the directional tape feed direction, the conversion The area reset excursion control current waveform is similar to shaping 707. The only difference is continuity During the control current up/down portion 708 determined by the reset portion 709 be. This period is inversely proportional to the feed rate of tape 42. Such high-speed movement movements In mode, the speed of the fast motion effect created on the display of the reproduction television information signal by resetting the position of the conversion area 56 along the conversion gap 26. Depends on how many recorded tracks are skipped. Skip many tracks For example, the shorter the period between resetting the position of the conversion area 56, the more The speed of the fast motion effect becomes faster.

Figure 20 also shows the conversion zone reset excursion control for the 3x high speed motion mode of operation. A current waveform 711 is shown. In this mode, tape 42 is used for normal recording and playback. The signal conversion location 106 (Fig. 16) is caused by forward tape feeding at a speed that is three times the speed. sent through. One track is tracked by the conversion area 56 during this mode. When racing, the recorded track being traced is 2 of the distance d (Figure 15). The tape is advanced by a distance in the forward tape feeding direction corresponding to twice the distance. Therefore, the conversion To maintain alignment between area 56 and its tracks, one conversion area The conversion gear is moved in the direction corresponding to the forward tape feed by a distance corresponding to between the traces of the It must be moved gradually along the cap 26. 3 times faster movement 3 daily recording tracks at normal field speed for television information signals This is achieved by playing.

The end of each trace by a distance corresponding to twice the track spacing d. a transducer zone 5 along transducer gap 26 in a direction corresponding to the tape advance direction opposite to By resetting the position of 6, the conversion area 56 will be Skip the next two adjacent downstream tracks that you would normally trace . These two downstream tracks are the next in the recording sequence of the television field. Contains two fields. The location of the conversion area 56 along the conversion gap 26 As a result of the reset, it records to the track that just finished tracing positioned to play the field.

By continuously moving the conversion area along the conversion gap 26 in this manner, Every third sequence of recorded television fields is played back from tape 42. , which is the normal motion determined by the recorded television information signal on the display. Create high-speed motion corresponding to 5 times.

Conversion area reset excursion control current waveform 71 for this triple high speed motion operation mode 1 is shown in FIG.

As is clear from this figure, the slope of rung portion 712 of waveform 711 is twice as fast. Similar to that for the motion mode of operation, but the tape 42 feed rate is faster Therefore, the only difference is that the waveform is sharper. Because of waveform 711 The reset portion 713 for waveform 707 is in the same direction as the reset portion 709 for waveform 707. corresponds to a distance twice the track spacing d.

The tape 42 is twice the normal recording and playback speed and three times the normal recording and playback speed. Any high-speed movement that is being fed in the forward tape feed direction at a speed within the range of In the operating mode, the conversion area reset excursion control current waveforms are waveform 707 and waveform 71. 1 composite waveform. At tape feed speeds within this range, the track spacing distance d is Both the reset corresponding to 1 times the track spacing distance d and the reset corresponding to twice the track spacing distance d. A reset sequence in the form of a pattern occurs. Certain of such resets The pattern is passed through tape 42. through signal transfer location 106 (FIG. 16). send a specific Depends on speed. Generally speaking, at high tape transport speeds within this range, the reset The sequence pattern includes a number of resets corresponding to twice the track spacing distance d. I'm reading.

In such high-speed motion operating modes, on the display of the reproduced television information signal The speed of the high-speed motion effect created depends on how far a single recording track is skipped. dependently, the two recorded tracks are in the conversion area 56 along the conversion gap 26. Skipped by resetting the position. track is two tracks The more times the number of times the item is skipped once compared to the number of times it is skipped, the more The speed of fast motion effects is slowed down. Of course, the high-speed motion effect of faster display is due to two factors. Tracks will be skipped more often. Toratsukifugu control circuit 227 The preferred embodiment of the variable speed regeneration servo 324 (FIGS. 16 and 19) also has a conversion gap. control the position and movement of the conversion area 56 along the width of the tape 26 and perform normal recording and playback operations. Playback from the tape occurs when the tape 42 is fed in a direction opposite to that of the raw operating mode. producing an inversion motion effect on the display for the display of the television information signal that is It is possible.

Figure 20 shows typical field rates for recorded television information signals. Conversion area reset excursion control current waveform 7 for reversing motion operating mode at corresponding speed 14 is shown. In this mode, the tape 42 is at one times the normal recording and playback speed. is sent through signal transfer location 106 (FIG. 16) in the opposite tape feed direction at a speed of Ru. When one track is traced by the conversion area 56 during this mode , the recorded track being traced corresponds to a distance 1 times the distance d (Fig. 15). The tape can be advanced by a distance in the opposite direction to normal tape transport. However, this In the rolling mode of operation, the tracks of the recorded television information signal are Must be played in reverse order with respect to the order in which they were recorded. For this reason, the tiger At the end of tracing the conversion area 56, the conversion area 56 moves to the next area to be traced. 2 of the track spacing d from the location along the translation gap that would align with the track. It is located along the transducer gap 26 which is deflected by twice the distance. two toss One deviation in rank spacing is the direction in which the tape 42 is sent through the signal transfer location 106. resulting from gradual movement of the conversion area 56 along the conversion gap 26 in a direction corresponding to Ru. The deviation of the second one of the two track intervals is the next track to be traced. This track based on the position of is faster than the track where the trace was just completed. Recorded in a sequence of recording tracks. Therefore, it is the conversion area 56 is aligned at the end of tracing the track by a distance equal to twice the track spacing d. The tape 42 is positioned downstream from the position of the tape 42 where it is applied.

Thus, alignment is maintained between the conversion zone 56 and the tracks in the reversal motion mode of operation. In order to along the transducing gap 26 in a direction corresponding to the opposite tape feed direction by a corresponding distance. should be moved gradually.

Is the 1x inversion motion effect at normal field speeds for television information signals? Play all recorded tracks in the reverse order to the sequence in which they were recorded. This is achieved by It is the distance corresponding to twice the track spacing distance d. The opposite direction corresponds to the opposite tape advance direction at the end of each track's trace. by resetting the position of the conversion area 56 along the conversion gap 26 in the direction of Thus, the conversion area 56 is adjacent to and below the track that has just completed tracing. Positioned to reproduce early recorded fields in tracks positioned in the flow It is decided. Continuously moving the conversion area 56 along the conversion gap 26 in this manner The sequence in which the continuous television field recorded The tape 42 is played back in the reverse sequence. record television field On the display of this inversion sequence of , an inversion motion effect is created.

The conversion zone reset excursion control current waveform 714 for this inversion motion mode of operation is This is shown in Figure 20. As is clear from FIG. 20, the ramp portion 71 of the waveform 714 6 is similar to that in the stop motion mode of operation, but the tape 42 is fed in the opposite direction. The difference is that it is sharper because it is in the opposite direction. Reset portion for waveform 714 717 is the same direction as the reset portion 706 for the waveform 701, and Corresponds to a distance twice the separation ratio id.

The tape 42 is reversed at a speed within the range between one times the normal recording and playback speed and zero speed. In any reversal motion mode of operation, such as when the tape is being fed in the tape feed direction, the conversion zone The area reset deviation control current waveform is a composite waveform of waveform 714 and waveform 701. child For tape feed speeds in the range of , the reset corresponding to 1 times the track spacing ratio id and a reset pattern corresponding to twice the track spacing ratio fid. A sequence of resets occurs. The specific pattern of such resets is A feature such that loop 42 is routed in the opposite direction through signal transfer location 106 (FIG. 16). Depends on constant speed. Typically 1 at higher reverse tape transport speeds within this range. , the pattern of the reset sequence corresponds to twice the track spacing distance d. Including many resets.

FIG. 19 shows a diagram for controlling the conversion zone 56 according to the waveforms described above in connection with FIG. Preferred Embodiment Circuit for Variable Speed Regeneration Servo 324 to Perform the Required Operations shows.

The particular mode of operation of the servo 324, i.e. the associated recording and playback device, is determined by mode selection. by system controller 132 (FIG. 1) to line 134 extending to line 331. Determined by the operator control mode selection command provided. Select this mode The command is sent to the two state switches 332 (FIG. 16) of the tracking control circuit 227. Control the state. The recording and playback device is placed in normal recording and playback operation mode. When configured, the operator should provide mode selection commands to the and switch 332 is set to its open state. This is variable speed playback servo 3 24 is disconnected from the adder circuit 323. As mentioned above, the truck In this mode, the king control circuit 227 determines whether the conversion area is to be traced. along the width W of the transducer gap 26 so as to remain aligned with the selected passageway 126. and serves to control the position and movement of the converted conversion area 56.

However, if the recording and playback device is put into special motion effect operation mode , the operator provides a mode selection command on line 551, which causes the system to A state in which the switch 332 connects the output 2 in 333 to the input of the adder circuit 323 Set. This allows the track generated by the variable speed regeneration servo 324 to The King mechanical error correction signal connects line 522 to the other input of summing circuit 323. The tracking position error correction signal output by the synchronization detector 313 via will be combined. As mentioned above, this applied to the output of adder circuit 325 The combined signal is further processed in the tracking control circuit 227. this The combined signals are then applied to the converter 20 according to the combined signals. Control electric current machine 1 and machine 2 to follow the commanded special motion effect. along the width W of the conversion gap 26 to reproduce the recorded television information signal. A saturation controller 54 is provided to control the position and movement of the conversion zone 56.

The reset operation performed by the variable speed regeneration servo 524 generates a reset signal. 732. Recording and playback device operating modes and tape forwarding Depending on the speed and direction, the reset signal generator generates the appropriate reset signal and These signals are provided to a resettable ramp generator 733. resettable lamp Generator 733 starts the next track of the recorded television information signal to be played. At the end of the trace of passage 126 selected to locate the transformation area Resetting the position of conversion zone 56 (FIG. 16) along conversion gap 26. Succession During the time interval between successive reset signals, ramp generator 753 generates a ramp signal of output line 553 to gradually move the conversion area 56 along the conversion gap. , thereby causing the conversion area to convert as it traces a path along the recording medium 42. The area is maintained in alignment with the selected passageway 126.

As is clear from the above, the reset signal generator 752 and the ramp generator 7 35 is a channel for the tape 42 to transport television information signals in connection therewith. Signal transfer location 1 at a speed and/or direction different from the normal speed and/or direction 06, according to the waveform pattern described above in connection with FIG. A track for controlling the position and movement of the conversion area 56 along the conversion gap 26. The kings cooperate to cause generation of mechanical error correction signals.

A ramp generator 73 is used to effect generation of a tracking mechanical error correction signal. 3 is the tracking error from the synchronization detector 313 (FIG. 16) via line 518. receives the correction signal and represents the speed at which tape 42 is sent through signal transfer location 106; It receives a signal applied to line 731.

In the preferred embodiment, ramp generator 735 is determined by the feed rate of tape 42. determined by the slope determined and the tracking position error signal present at line 518. The speed indication on line 731 is to generate a ramp signal having an average value, etc. It takes the form of an integrator that responds to the signal. Therefore, the tracking position error is When the range tracking position error changes, the average level of the ramp signal is modulated.

The tape speed indication signal on line 751 is output to tape speed and direction detector 541 (first (Figure 6), which is derived from the detected tape speed signal given by 342 to one input of summing circuit 754. Adder circuit 757 The other input is for being combined with the detected tape speed indication signal on line 751. A negative x1 tape speed offset reference signal is received on line 736. This offset A single signal based on tape is a tape speed indication signal given to a ramp generator, which is normally used for tape feeding. Normalized to ×1 recording and playback speed. Preferred implementation of tracking control circuit 227 In the example, the detected tape speed signal is conveniently applied to the tape 42 being fed. from an operatively coupled tachometer 140 (FIG. 1). However, faith The rate of advance of tape 42 through number transfer location 106 may be detected by other methods if desired. It can be done. The timing signal recorded along the length of the tape 42 indicates the tape speed. Contains information that can be detected. For helical scanning recording and playback equipment The frequency of the horizontal synchronization signal included in the reproduced television information signal is The track on which the revision information signal is recorded extends substantially in the tape transport direction. The feeding speed of the tape 42 changes accordingly. Therefore, the tape advance speed is The horizontal synchronization pulses are separated from the received television information signal and their frequencies are measured. can be detected by determining Recorded control track signal is information by which the speed of transport of tape 42 through signal transfer location 106 can be detected. are other types of signals that include.

When a tape tachometer is used to detect the feed rate of tape 42, A conventional capstan or idler tachometer is typically used. child A device such as Regardless of the source of the tape speed related signal, the signal is routed to the tape via line 344. is applied to the input of speed and direction detector 541, and detector 341 detects accordingly. A tape speed signal is generated and applied to line 342 and adder circuit 734.

Ramp generator 735 responds to the tape speed indication signal provided on line 731 to Extend a ramp signal on line 335 with a slope proportional to the commanded tape speed. Occurs on the output. However, as generally discussed above in connection with FIG. The variable speed playback servo 524 causes the tape 42 to rotate in the opposite direction and in the normal forward direction. the position and movement of transducer zone 56 along transducer 26 as it is being fed in the feed direction; can be controlled. Distinguishes the tape's transport in both directions through the signal transfer location 106. To differentiate, ramp generator 733 outputs tape speed and direction via line 543. It is connected to the output of detector 341 (FIG. 16). The tape feed direction signal is detected by detector 3. 41 to this line. This is the tape tacho received on line 344. The tape feeding direction is detected from the meter pulse in a known manner.

In a preferred embodiment of variable speed regeneration servo 324, level detectors 741, 742 ．． 745 and 744 transform the selected path 126 into a gap at the end of tracing. A reset signal is generated to cause the conversion area 56 along the width W of 26 to be reset. used by generator 732 to determine whether a reset signal should be provided. It will be done. In this regard, a cylindrical tape guide as shown in FIGS. When the tape 42 is being fed to the helical path around the circumference of the drum 250, the tape 42 one converter 2o for recording and reproducing television information signals along In the helical scan recording and playback equipment used, each time the transducer rotates, a droplet is generated. A time interval of drop-outs occurs in the reproduced television information signal. This drop The occurrence of the pull-out time interval is synchronous with the rotation of the transducer 20, and the transducer is occurs on each rotation across the spacing between the loop guide posts 240 and 242. That's it The timing of this reset signal is preferably set in a preferred embodiment of the present invention. , occurs during the dropout period, and is reset in the deflection control current waveform of FIG. of the conversion area 56 indicated by set portions 706.709.713 and 717. The amplitude of the reset signal for resetting depends on the feeding speed and direction of the tape 42. producing a lateral movement of the conversion area 56 equal to one or two track spacing distances d; It is shown as Resetting the conversion area 56 during the dropout period It is preferable to use the start and time method. Video image portion of recorded television information signal along the conversion gap 26 before being positioned to be regenerated into the conversion area. the television information to allow sufficient time to properly reposition the conversion area 56. Because a dropout period typically occurs during the vertical blanking period of the signal It is. However, a reset of conversion area 56 occurs during the dropout period. It is not a requirement of the invention that it must be timed so as to be accurate. example For example, recording formats with no dropout period or vertical blanking A record characterized by a king period that does not align with the end of the recorded track. data in recording and playback equipment or for signals other than television information signals. In a data recording device, resetting the location of the conversion area 56 means that the segment of information associated with tape 42 by other transducers tracing portions of adjacent tracks. selected to occur during the middle part of the track being traced while being transferred. may be selected. In such embodiments, the transducer areas 56 may be located in close proximity to each other, for example. Reset between intermediate parts of adjacent tracks to retrace parts of the track. to be However, in embodiments of the invention, resetting the conversion area 56 synchronization as done during the dropout period that occurs at the end of the trace I am forced to do it. In this regard, the reset signal is extended to 2amp generation g;, 733. One drum rotation tachometer that activates the gate circuit 746 connected to the opening line 747. generated in response to a data signal. This processed one-rotation tachometer signal is transferred to the converter - Operation with rotating upper drum portion 252 of drum assembly 240 (FIGS. 15 and 14) from the pulses generated by the associated tachometer 142 (FIG. 1). , one pulse is generated for each rotation of rotating drum section 252 and thus converting section 56. is given for the rotation of The known tachometer processing circuit is a tracking control circuit. 227 to line 351 with a pulse of desired system time and selected width. give. It will become clearer if we consider the following description of the reset signal generator 732. For this reason, the processed single revolution tachometer signal is gated through delay circuit 748. is applied to circuit 746. One revolution tachometer signal delayed by gate circuit 746 When activated, a current predetermined pulse occurs on line 747; rung generator 733 for the purpose of resetting the signal level to the output on line 555; is given to the integrator. Activation of gate circuit 746 occurs during rotation of transducer 20. Place at desired location along transformation gap to trace next selected passage Convert at the end of tracing the selected path 126 by the distance required to Appropriate oscillation pressure is required to move the conversion area 56 along the gap 26. by a ramp generator 733 of a predetermined value such as corresponds to the set step. causes a reset step in the output given by

The amplitude of the current pulse provided by gate circuit 746 depends on the tape advance speed and one of two values depending on the direction and one of the two directions becomes.

The various amplitudes and directions of the current pulses are determined by the excursion control current waveform shown in FIG. Examples are given below. The particular current pulse provided by gate circuit 746 Determined by Bell detectors 741, 742, 745 and 744. in more detail In this case, the output of the ramp generator 733 is sent to four level detectors 741, 742, 745 and and 744 along line 555, respectively. This level detector effectively monitors and converts the instantaneous amplitude value of the signal on line 335. Determining the location of the conversion zone 56 along the gap 26 ~ thereby determining the reset pulse Determines whether a command should be generated to reset the location of the transform area.

Respective level detectors 741, 742, 745 and 744 are connected to line 7, respectively. 51.752.75! l and the other input connected to one of 754, which is , the duplication of the conversion area 56 along the conversion gap 26 such that the conversion area is reset. A threshold signal value corresponding to one of the number positions is provided.

In the embodiment of variable speed regeneration servo 324 of FIG. , the conversion area 56 provides forward tape transport for normal recording and playback modes of operation. along the transformation gap 26 beyond its nominal unexplained position in a direction opposite to the A threshold signal value corresponding to being positioned by the controllable cuff 51 is receive. Therefore, if the instantaneous level of the 2amp signal on line 335 is exceeds the value of the threshold signal of If the level detector is deflected beyond its nominal position in a direction opposite to 741 produces an output signal, which is applied to activate gate circuit 746. Ru. If this condition occurs upon the occurrence of the one revolution tachometer signal on line 551 Then, the output signal provided by the level detector 741 passes through the gate circuit 746. Activate and move forward translation gap 2 by a distance corresponding to one track spacing d. A reset step signal is generated which causes a displacement of the conversion area 56 along 6.

Tracking mechanical or deflection waveform 701 in FIG. 20 illustrates this condition. The following notes In this paper, forward and reverse directions refer to the forward and reverse directions of tape movement. The forward direction refers to the direction in which the tape 42 is fed during recording and playback operation modes. means.

Level detector 742 indicates the distance that conversion area 56 corresponds to one track spacing d. Translation gap 2 across a position offset in the opposite direction from the nominal unexcluded position of the keel 6 such that it receives a threshold signal value corresponding to being positioned along It has a controlled cuff 52. If the instantaneous voltage level of the ramp signal on line 353 exceeds the level of the threshold signal on line 752, i.e., in conversion region 56. exceeds its nominal position in the opposite direction by a distance greater than one track spacing d. level detector 742 has an output that activates gate circuit 746. give a force signal. If this condition occurs the one revolution tachometer signal on line 351 occurs at the time, the two level detectors 741 and 742 provide an output signal. Ru. This activates gate circuit 746 to correspond to twice the tracking interval d. a distance that causes a displacement of the conversion area 56 along the conversion gap 26 in the forward direction; Generates a set step signal. Tracking mechanical or deflection waveform 7 of FIG. 14 indicates this state.

The level detector 743 detects its nominal non-zero distance by a distance corresponding to one track spacing d. The conversion area 56 extends into the conversion gap 26 beyond the position offset forward from the offset position. a controlled expression receiving a threshold signal level corresponding to being positioned along the It has a cuff 53. If the instantaneous level of the ramp signal on line 333 is 3, i.e. the conversion area 56 is lower than the value of the threshold signal at If it is caused to deviate beyond its nominal position in the feed direction, the level detector 7 43 provides an output signal that activates gate circuit 746. If this condition is the line 351, the level detector 7 The output signal provided by 41 activates gate circuit 746 to A conversion area 56 along the conversion gap 26 in the opposite direction by a distance corresponding to the gap spacing d. Generates a reset step signal that causes the deviation of . This tracking machine The target or deflection waveform 707 (FIG. 20) illustrates this condition.

A fourth level detector 744 nominally measures a distance corresponding to one track spacing d. The conversion area 56 is moved beyond the forwardly displaced position from the undeflected position to the conversion gear. receives a threshold signal value corresponding to being positioned along the cap 26; It has a controlled cuff 54. If the instantaneous level of the ramp signal on line 533 is 2 less than the threshold signal value at input 754, i.e., conversion area 56 is one the nominal position in the forward chive feed direction by a distance greater than the track spacing d. If the Lunar is deflected beyond the Provides an activating output signal. If this condition is a 1-turn tachometer with a 2-in 351 The two level detectors 743 and 744 output give a force signal. This activates the gate circuit 746 and increases the track spacing by twice the track spacing d. performing a deflection of the conversion area 56 along the conversion gap 26 in the opposite direction by a corresponding distance; A reset step signal is generated so that the Tracking machine in Figure 20 Mechanical or excursion waveform 711 illustrates this condition.

If the level detectors 741, 742, 743 and 744 Given the signal value, the average position of the conversion area 56 along the conversion gap 26 is , according to a tracking mechanical waveform generated by variable speed regeneration servo 524. with respect to its nominal undisplaced position along the transformation gap when moved by Not always centered. Nominal non-excursion along transformation gap 46 Mechanical tracking that centers the conversion area 56 with respect to its position and does not maintain it on average. To avoid waveforms, the threshold signal value is adjusted to the feed rate of the tape 42. Therefore, it is changed and applied to the level detector. More specifically, the level detector 741 ．． 742.745 and 744 control input cuff 51° 752.755 and 754 are la to receive the normalized tape speed indication signal present at input 731, respectively. Connected. If the relationship between the various circuits included in the variable speed playback servo 524 If necessary, the normalized tape speed indication signal present on line 731 may also be Processed, level detector 741.742.745 and 7°44 control large sword When the tracking mechanical waveform is centered on the desired centering of the conversion area to occur.

The various tracking mechanical waveforms necessary to generate the various tracking mechanical waveforms described above are To account for the threshold signal value, the normalized tape speed indication signal is Bell detector control input lines 751, 752, 753 and 754. biased to a selected voltage level.

These voltage levels are selected to correspond to the reset activation values discussed above. Re Bell detector 741 detects when conversion zone 56 exceeds its nominal non-excursion position to meet the conversion gap. When positioned along the step 26, a reset step signal is generated. A bias of zero is selected for the detector 741 to be activated as . Therefore, the normalized tape speed instruction signal is applied to the direct control line 751. can be obtained.

However, level detectors 742, 743 and 744 have non-zero bias. I need. To give the proper bias to the normalized tape speed indication signal, add One input to each of circuits 762, 763 and 764 connects line 731 and controller and force lines 752, 753 and 754, respectively. Addition circuit 76 2 is the transformation beyond the nominal unbiased position in the opposite direction by a distance of one track spacing d. A bias corresponding to the deflection of area 56 is applied to the other inlet cuff 66 .

Summing circuit 765 offsets its nominal non-excursion forward by a distance of one track spacing d. The person's cuff 67 receives a bias corresponding to the displacement of the translation zone 56 beyond its position. . The summing circuit 764 converts the conversion area 560 two tracks beyond the nominal non-excursion position. The person receives a bias at the cuff 68 corresponding to the deviation of the distance d. each addition time The control input line combines these biases with the received normalized tape speed indication signal. Tape speed dependent threshold signal levels applied to pins 752, 755 and 754. Generates a bell. These control input lines are connected to level detectors 742, 745 and 74. Each extends to 40 control inputs. Tape speed dependent threads generated in this way Upon receiving the threshold signal level, the reset generator 732 outputs the level detector 74. 1.742.745 and 744, the variable speed playback servo 324 As the conversion area 56 is moved along the conversion gap 26, its nominal a tracking mechanical waveform that centers and maintains the transducer area 56 with respect to the deflection position; the tape when rotated to trace the path along the tape. Alignment with the track is maintained along the loop 42.

Level detectors 741, 742, 745 and 7 are used to generate a reset pulse. 44 to the D inputs of latches 781, 782, 783 and 784, respectively. It has respective output lines 771, 772, 775 and 774 connected thereto. So The Q output of each latch is applied via lines 791.792.793 and 794. It is connected to the calculation circuit 7960 input. Inverters 786 and 787 are each The level detector 743 is placed between the bits 781 and 782 and the adder circuit and 744 as opposed to level detectors 741 and 74. 2 different reset directions to be executed by the conversion area 56 depending on the output of is taken into account. Adder circuit 796 resides on lines 791.792.793 and 7?4. The existing reset step signals are combined to create the conversion zone excursion waveform shown in FIG. It works to form a reset part. This result formed by adder circuit 796 The combined reset step signal is applied to the signal input of gate circuit 746 on its output line. 797. This is typically a delayed one-time request, as described above. Ramp the level of the signal present at the signal input at the time of occurrence of the rotary tachometer signal. Generator 733 reset step signal is generated and applied to the ramp generator 733. The line 351 that receives the processed single revolution tachometer signal is latched to Clock (CK) input of 781, 782, 783 and 784 and delay circuit 748 given to. Delay circuit 748 has an output signal coupled to a control input of gate circuit 746. It has 750 ins. The processed one-turn tachometer signal is sent to latches 781 and 782. , 783 and 784 to clock the level detectors 741, 742, 743 and and 744 outputs. This latch The gate circuit 746 is reset by the delayed tachometer signal. conversion section 5 before being activated to couple the step signal to ramp generator 735. A decision is made whether a six step reset is necessary.

Following a preferred time interval after this latching of the output of the level detector, the delay The extended tachometer signal is connected to line 750 which extends to the control input of gate circuit 746. and the gate circuit 746 receives the reset step formed by the adder circuit 79B. is activated to provide a ramp signal to ramp generator 733.

In operation, if the occurrence of the processed single revolution tachometer signal on line 351 When the instantaneous level of the ramp signal on line 335 is detected by level detectors 741 and 742 , 743 and 744. If the signal level exceeds a certain value, the threshold signal level is exceeded. The output line associated with each output of the level detector is activated and its state is The clocking action of the processed single revolution tachometer signal at input 351 It is latched to the connected latch. One delayed processed revolution in line 750 Upon occurrence of the tachometer signal, gate circuit 746 is activated and summing circuit 79 The contents of the latch holding the activated state coupled by the ramp generator 753 It is provided as a reset step signal on line 747 extending to the reset input.

This signal causes a reset of the level of the haramp signal. For convenience, delay circuit 7 48 delays the processed one-turn tachometer signal so that it becomes the one-turn tachometer signal. The time interval after generating the unprocessed tachometer signal corresponding to the period of 750. This is 2 times in subsequent dropout time intervals. The occurrence of the delayed tachometer signal at in 750 is timed. For this, The one revolution tachometer signal is Line 351 extends to the clock input of latches 781, 782, 783 and 784 It is processed as if it were placed in

As a result of the above-described operation of reset generator 732 and ramp generator 733, The variable speed reproduction servo 324 is an adder circuit 323 (Fig. 16), which performs composite tracking. Tracking provided by servo compensator 321 to form an error signal A tracking mechanical error correction signal is generated which is combined with the position error signal. mentioned above As described above, this composite signal maintains the conversion area aligned with the selected path 126. saturation to adjust the position of the transducing area 56 overflowing the transducing gap 26. is applied to a sum controller 54.

A variable speed regeneration servo 524 controls the position of the transducer zone 56 along the transducer gap 26 and Various forms can be taken to provide the desired control of movement. For example, suitable Examples include: to determine when the location of the transformation area must be reset. A lamp is emitted so as to detect the position of the conversion area 56 located within the width W of the conversion gap 26. The level of the ramp signal present at output 2 in 335 of generator 733 is monitored. death However, other techniques for detecting the location of conversion area 56 may be used as well. Wear. The vertical synchronization signal included in the reproduced television information signal is conveniently This can be done by separating the can be used for any purpose. The occurrence of the vertical synchronization signal is based on the tape 42 feed schedule. Vary with respect to stable criteria with speed and direction. If this technique is used If so, there is no need to provide information about the tracking position error to the ramp generator 733. do not have. The vertical synchronization signal included in the reproduced television information signal is also passed through the gate circuit 74. 6 and latches 741, 742, 743 and 744. can also be used. In such embodiments, the separated vertical sync signal is It can be used in the same manner as a single revolution tachometer signal. resettable Embodiments of ramp generator 753 also provide tracking provided by synchronization detector 313. may be configured to generate a ramp from the tracking position error signal 318. Fruit like this In embodiments, ramp generator 733 is configured to control normal recording and playback speeds and feed directions. conversion zone 56 and selected path 126 at different tape transport speeds and directions. It is possible to generate an appropriate slope ramp signal to compensate for mismatch between It depends on the effect of the servo looseness on the circumference of the dynamic conversion area 56.

The above-described embodiments of the present invention provide a conversion section for transferring information signals in conjunction with a magnetic recording medium. The same magnetically permeable body as the transducer gap 26, in which the region 56 defines the transducer zone. The device is configured to use a magnetic signal transducer such as that in the device. Figures 21-24 includes a magnetic recording medium (not shown in FIGS. 21-24) and a transducer core 500. a magnetically permeable material with the same properties as the keeper provided as an intermediate between a magnetically permeable material defining an associated body 228 of the material and a transducing gap 26; 2 shows an example of a magnetic signal transducer 20 having a core 500 of FIG. Other embodiments of the converter When magnetically saturating transducer core 500 in the manner described above in connection with The image of the conversion gap 26 is set in the keeper body 228. converter core 50 A control flux that sets a saturated region of zero emanates from the physical transducer gap 26; branched by keeper 228 to form an image of the transformation gap therein. Ru. The keeper 228 is connected to the information signal being transferred between the transducer 20 and the magnetic recording medium. Therefore, the conversion gap is physically set so that it is not saturated by the magnetic flux set to it. The control magnetic flux is selected to have a thickness in the direction of the depth dimension of the tap 26. The magnetic flux recorded on the recording medium has been erased, or it may have other undesirable effects. It doesn't have a strong flavor. Generally, the thickness of the keeper 228 is the thickness of the transducer core. determined by the same conditions that determine the depth of the physical transducer gap 26 of 500 Ru.

The position of keeper 228 relative to core 500 and the desired control field to effect saturation. Level must be considered as well. Furthermore, the keeper 228 controls the magnetic flux. The provided reluctance is determined by the desired reluctance of the information signal between the transducer 20 and the magnetic recording medium. selected in relation to the reluctance in the transducer core 500 to ensure the transfer of Ru. Relative reluctance depends on the thickness of the keeper, the material of the keeper, the area of the transducer magnetic pole face, and the saturation. The width of the summed keeper area separates the converter 20 and the magnetic recording medium during signal transfer. Air gap thickness and relative reluctance of keeper 228 and transducer core 500 This is achieved by selecting an appropriate combination of other parameters that determine the

FIG. 21 shows that the keeper 228 is connected to the transducer core 500 and the magnetic recording medium 42 (the first and (See Figure 16). However, the first In FIG. 21, keeper 228 appears to be in physical contact with transducer core 500. , it is in physical contact with the magnetic recording medium 42 that the transducer core 500 from both the magnetic recording medium and the transducer core. May be separated. The keeper 228 is connected to the transducer core 500 by a magnetic recording medium. May be physically separated. In either case, transducer core 500. Key The flow of magnetic flux between the pad 228 and the recording medium 42 is the same. Magnetic recording medium and core 5 This placement of the keeper 228 between 00 and 00 is desired to prevent head wear. In situations where it is desirable to physically separate the recording medium and the core, It is preferable.

The foregoing description has been further elaborated with reference to the same specific configurations as the embodiments of the invention described below. It will be well understood.

In FIG. 21, the transducer 20 is made of a magnetic material, such as ferrite. It has two opposing halves 1511 and 512. Each back core 511 ．． 512 are front cores 514 . which abut at opposing surfaces 522 and 524 , respectively. 515 and back cores 516 and 517. The front cores 514 and 515 are conversion gears. the shape of the wedge-shaped portions oriented in opposite directions in a plane defined by the cap 26; Made with. oriented in opposite directions of each opposing half-core 511, 512. The wedge-shaped portion has a cross-sectional area that gradually increases in opposite directions over the width W of the transducer 2. Ru.

The facing face cores 514, 515 preferably have facing magnetic pole faces 518, 519. It is lapped and polished smoothly on the plane of the conversion gap 26 to obtain.

A winding window (not shown in FIG. 21) houses the conversion signal winding 25 in a known manner. one or both front cores 514, 51 across the width W of the transducer 20 to accommodate 5. - By way of example, the winding 25 is a single turn winding in the form of a conductive rod. It is shown as. However, known multi-turn windings are used instead. Good too. The preferred non-magnetic material is a transducer gap formed using known transducer gap forming techniques. The front core 514 and the 515. For example, a layer of silicon dioxide or glass may be placed on the front core. 514 and 515, which surfaces may then be provided in a known manner. may be combined with each other. Gap 26 is a keeper as described in detail below. 228 magnetically created “virtual” gaps to be distinguished from “physical” gaps. It is referred to as a cap.

In the embodiment shown in FIG. 21, each groove 582 4 are provided on the back cores 516 and 517 facing inward. The grooves 582 are each The back cores 516 and 517 respectively serve to house the control windings 58 and 59 of the .

By placing the control windings 58,59 in the recess provided by the groove 582 , 522 and 524, respectively, are in intimate contact with the opposing lateral surfaces of the front and back cores. The air gap between the front and back cores is thereby virtually eliminated and these The desired tight, low-lactance magnetic coupling between the cores is obtained.

In another aspect, as described, for example, in U.S. patent application Ser. Other back core designs different from that shown in Figure 21 as shown may be given.

A keeper 228 of thin magnetic material is mounted on the front surface 557 of the front cores 514, 515. is placed in direct contact with the physical gap 26 and bridges the physical gap 26. Keeper 228 is preferably a substantially rectangular hysteresis loop, i.e. Low coercivity and large materials such as Cefdust, ferrite or amorphous metals Made of soft magnetic material with a magnetic permeability value. Keeper 528 preferably , α00025 and the pole in the depth direction of the conversion gap 26 between 0.002 inches It has a very small thickness t.

In the embodiment of FIG. 21, the overall dimensions of the flat surface of keeper 228 are It matches the dimensions of the surface 557 of the underlying layer. In another aspect, the dimensions of the keeper are different. Also, it is the physical transformation gap provided between the front core 14 and 150 facing surfaces. 26.

In this embodiment, the back cores 516, 517 are also the same as the front cores 514, 515. Formed as wedge-shaped sections oriented in similar opposite directions. Chirui is on the back A is suitable for providing controlled magnetic flux to selectively saturate the front core 514,515. It may be of a suitable rectangular shape or of any other shape. The control windings 58 and 59 are each back core at right angles to the direction in which the switching signal winding 21 passes through the front core. It is wound around 51/, 517. This configuration of the signal and control windings The respective signal (conversion) magnetic flux 540 and control magnetic flux 541, 542 are connected to the converter core. It is induced by a. The control magnetic fluxes 541 and 542 are substantially perpendicular to the signal magnetic flux 540. extending in the normal direction, they flow substantially parallel to the width W of the gap 26, thereby causing Substantially reduces the effect on signal flux.

Preferably, the keeper 228 secures the front cores 514, 5 using well-known material anti-stick techniques. 15 surface 557 by direct vacuum sputter linking or plating. It will be done.

Respective front cores 514, 51 in a plane perpendicular to control flux paths 541, 542 The combined cross-sectional area of 5 and keeper 228 is controlled by the controlled magnetic flux. To avoid saturation, the corresponding cross-sectional area of the back cores 516, 517 is selected to be small. Also, the material of the back core is the back core before the front core. has a greater saturation density than the frontal core material to prevent it from becoming saturated It may be selected as follows.

In FIG. 21, each control current II generated by the saturation controller 54 , I2 are applied to control windings 58,59. The controlled magnetic flux is controlled by the magnetic flux lines 541, 542 in the direction perpendicular to the direction of the control current, respectively. are guided to the back cores 516, 517 of the. Control magnet from back core 516.517 The bundles are respectively connected to and overlapping closely spaced front cores 514 and 515. The keeper 228 is coupled to the keeper 228. Two control magnetic fluxes 541 and 542 are shown in FIG. Similarly, the control current is adjusted so that it extends in the same direction as shown in Figure 21. 11. The interference between these control fluxes across the transducer gap 26 when orienting I2 is greatly reduced.

In the embodiment of FIG. 21, the size of the control current wire 1 is from the back core 516 The control magnetic flux 541 induced in the core 514 has a portion 544 and a weight having a width W1. The keeper layer 228 is selected to saturate the portion 554 of the keeper layer 228 that has become saturated. Furthermore, the 21st As shown in the figure, the size of the control current wire 2 saturates the portion 545 having the width W2. From the back core 517 to the front core 515 and the overlapping keeper layer 228, selected to induce magnetic flux 542. Each saturated part has a hatch This is indicated by the part that has been engraved.

In this particular transducer embodiment, the top and bottom portions of the frontal core is saturated in areas where the front and back cores are in close contact with each other. There is no. This results in an enlarged cross-sectional area in these parts and therefore control flux path 54. Due to the low magnetic flux density perpendicular to 1,542.

Therefore, only the area within the reduced width W' is saturated.

Because the cross-sectional area in the direction perpendicular to the magnetic flux paths 541 and 542 is very small, the physical The entire portion of the keeper 228 bridging the target gap 26 is the hatched portion 5. 29, the control magnetic fluxes 541, 542 saturate along the width W'. be harmonized. Therefore, the saturated portion 529 is keyed from the physical gap 26. A virtual translation gap 529 is projected onto the screen 228 . saturated core Portions 544 and 545 are adjacent large permeabilities that overlap across the virtual gap 529. Define the unsaturated portion or region of. made physical by virtual gap 529 The overlapping transparent part is converted into a large transparent part with a width W3 in the keeper 228. Define area 56. More specifically, the upper edge of the conversion zone 56 is a saturated zone 544 and its lower edge is saturated by a saturated area 545. It is determined by

As is clear from Fig. 21, the overall gear width W' = W1 + W2 + W3 is constant ab, a part of which has width W5 is the control current 11. When I2 is given becomes effective as the conversion area 56.

For example, decrease the magnitude of control current I2 and increase the magnitude of control current 1 proportionally. The width of each W1. W2 changes proportionally and the conversion area 56 changes proportionally. can be selectively moved along the width W' of the physical conversion gap 26. for example, When it is desired to move the conversion area 56 along the width W' at high speed, the control winding 38 and 39 are connected to a saturation controller 54 (FIG. 16), which in turn The magnitude of the two currents ■1°I2 is controlled by the switching controller 227 in opposite directions. The width W1 of the saturated portions 544 and 545 varies periodically and linearly. , W2 is changed in the opposite direction. The effect of this control is 11.16.19 and and 20 tracking control circuit 227 in the manner described above in connection with the virtual translation gap. This results in a movement of the conversion area 56 along the width W' of the tap 529. changes during such control. In order to maintain the width W3 of the switching area 56 constant, the sum of the varying control currents, that is, 11 + It is necessary to keep I2 constant and equal.

The front cores 514, 515 and the keeper 228 are selectively saturated as described above. The saturation control circuit 54 shown in FIG. 38.39 to control the respective control currents 11. used to supply I2. may be used.

In order to obtain very high quality performance with this embodiment of the transducer 20, the front core 51 is 4,515 and between adjacent saturated and unsaturated areas of the superimposed keeper 228. Well-defined boundaries are desired. This is the adjacent cross-sectional area of each core. facing surfaces such that the maximum rate of change of magnetic permeability between them is obtained over the conversion amount W obtained in a preferred embodiment by selecting the shape of the core. Let's do this, so Selected portions of each front core are saturated by the control current and a large magnetic flux is applied to them. The contiguous parts that do not pass through the Make sure it remains transparent enough so that it remains transparent. As a result, the performance of converter 20 is Magnetic permeability versus magnetic field between each adjacent saturated and unsaturated region in each frontal core It depends on the sharpness of the flux density gradient.

Sharp permeability versus magnetic flux density desired to form a well-defined conversion zone 56 The transducer core 500 and keeper 228 have a sharp permeability versus flux density gradient. and between adjacent cross-sectional sections at W′ in the transducer. obtained by designing the wedge-shaped part to have a large magnetic flux density change at It will be done. The ferrite material PS52B manufactured by Ampex is the core 500 and keeper 228. Permeability of this material The characteristic of the ratio m versus magnetic flux density B is shown in FIG. Wedge-shaped front and back air Portions 514, 515 and 516 and 517 are oriented in desired opposite directions along the width dimension. The width of the transducer 20 is set so that the width WKi of the transducer 20 is They are arranged so as to increase in the direction. The effect of arranging the wedge shadow forming parts like this are the same as described above in connection with FIGS. 9 and 10. Keeper 228 is the 21st By overlapping the front cores 514 and 515 as shown in the figure, the Control behavior remains virtually unchanged. Does further increase in permeability gradient have magnetic anisotropy? Achieved through the use of a transducer core material with two easy magnetization axes perpendicular to the transducer gap plane. can be done.

magnetic flux density between two adjacent cross-sectional sections to obtain the desired maximum permeability versus magnetic flux density gradient. To further increase the flux density gradient, the wedge-shaped section can be moved logarithmically in the direction of W in the transducer. formed to obtain numerically increasing cross-sections of wedge-shaped front cores 514, 515. Ru. This is a logarithmic function of the front cores 514 and 515 as shown by the dotted line in FIG. can be obtained by providing increasing side surfaces 548, 549 to .

As is clear from the above description of the operation of the transducer of FIG. Control magnetic flux 541 or 542 generated in 6 or 517 is coupled to other back core It must be. Therefore, the conversion gear given between the front cores 514 and 515 A gap 550 of a considerably large length relative to the length of the cap 26 is formed between these rear cores. It is preferable to give between 516 and 517. Preferably, this ratio is 10:1 or is selected more than that.

The transducer front surface 43 of the transducer-to-media interface portion is generally shown in FIG. is shown flat, but can be arbitrarily contoured using well-known contouring techniques if desired. can be formed. In that case, if the keeper 228 also takes this external shape, I want you to understand what I mean.

The thus obtained transducer structure is held in a non-magnetic holder (not shown) and Connect each transducer core element to each other using a bonding technique such as epoxy. It is preferable that the However, the retainer and bonding material are details of the transducer 20. They are not shown in the drawings to show them more clearly.

As discussed above in connection with the embodiment of transducer 20 shown in FIG. The control magnetic fluxes 541 and 542 are arranged in a path substantially perpendicular to the direction of the conversion signal magnetic flux 540. elongation, and interference between these magnetic fluxes is reduced. However, the conversion according to the invention This is not a necessary condition for proper operation of the device. saturable keeper 228 Due to the presence, the emanating magnetic flux outside the effective conversion area 56 is focused within the keeper, Therefore, on top of prior art converters commonly associated with crosstalk and signal cancellation. Reduces the drawbacks mentioned above.

In the embodiment of the transducer 20 of FIG. 21, the control of each control winding 38,59 Current J1. I2 are in the same direction, so that the control flux paths 541, 542 are in the front direction. It extends in the same direction through cores 514, 515 and keeper 228. two front faces The magnetic poles at the adjacent ends of A 514, 515 are similar and above the transducer gap 26. The lower end is designated as the south pole S, and the lower end is designated as the north pole N. that Overlapping portion 544 of each front core 514, 515 and keeper 228. By selectively saturating 545, the front core 514. virtual translation gap portion 5 of the thin keeper 228 bridging the translation gap 26 29 is made to be saturated as described above, it forms a virtual translation gap 56. to be accomplished. These saturated areas 544, 545 and 529 are shown in FIG. It is shown as the part that has been edited. Close to front core 5j4, 515 and saturated part The portions of the keeper 228 that have been A conversion area 59 is formed across a virtual conversion gap 529.

Similar magnetization at the adjacent ends of the front cores 514, 515 across the transducer gap 26 In the particular embodiment of transducer 20 shown in FIG. 24 in relation to the poles, the The control magnetic flux lines 541 and 542 are substantially straight lines between the magnetic poles S and N on both sides of the keeper 228. It extends through the saturated portion 529.

The width W3 and the position of the converter 56 control the magnitude of the control currents 11 and I2 as described above. is positioned and moved along the width W' of the transducer 20 by controlling obtain.

In the embodiment of converter 20 shown in FIG. 22, control current 11. I2 is control They are shown flowing in opposite directions through windings 58,59. For this reason, the front In the cores 514 and 515, oppositely oriented magnetic poles S and N form the transducer gap. 26 are formed at adjacent ends of wedge-shaped portions oriented in opposite directions. child In this case, the portions 544, 545 of the front core and the portion 529 of the keeper 228 are are saturated by the respective control magnetic fluxes 541 and 542 flowing in opposite directions. Ru. When these oppositely oriented control fluxes approach each other, they are repelled, From region 529 to the respective core halves 514, 515 and keys shown in FIG. The adjacent portions of the path 226 are separated into different magnetic flux paths. Each separate magnetic flux The path returns to the opposite magnetic pole formed in the same core from which it was generated. Minute of magnetic flux path Due to the difference, the portion 560 is between the respective saturated regions 56a and 56b. It has a much lower magnetic flux density than the saturation density of the keeper 228. ing. Therefore, there is little magnetic flux in this portion 560 and it does not saturate. . This region or area 560 is subject to opposing magnetic flux bucking effects. Because of this formation, it is called a ``backing region'' or ``backing area.'' Ru.

However, it overlaps with the large unsaturated transparent part of core 514.5f5. The portions 56a and 56b of the saturated portion 529 that separate the keeper 228 from the virtual conversion form an area.

Those portions of saturated keeper portion 529 adjacent to saturated regions 544, 545 are Do not form virtual gaps.

Therefore, in the embodiment of FIG. 22, each conversion area 56a, 56b is 1 Defined by saturated portions 544, 545 on one side and buckled on the other side. 560. Each area 56a, 56b is magnetic It may be used to record or reproduce signals in relation to a medium. mentioned above As shown, there is no virtual gap in the backing region 560 and therefore no signal transfer occurs. Transfer cannot be granted thereby.

As is clear from comparing the converter 20 of FIG. 22 and the converter of FIG. In place of one conversion area 56 in the embodiment of FIG. Two such areas 56a, 56b separated by It will be given at a later date.

The area thus obtained, as described in connection with Figures 11A-11D 56a, 56b, 560 are controlled as described above with respect to other embodiments of transducer 20. Current flow 11. By controlling the magnitude of I2, the position along the width W of the p converter 20 can be determined and moved together. Furthermore, two conversion areas 56a, 56 b in the keeper 228, this embodiment allows for the tracking along the recording medium. transducer without the need to intentionally vibrate the transducer area with respect to the selected path being Tracking position error between 20 and a selected path along magnetic recording medium 42 can be used to conveniently detect. For example, this embodiment of transducer 20 Pre-recorded tracking along the recording medium in close proximity to the location where the signal is recorded It can be used to detect signals. In the opposite direction to the transducer 20 of FIG. The tracking signal phase-coordinated to the information signal to be transferred in relation to the recording medium. recorded along the recording medium at a frequency outside the signal frequency band. recorded on recording medium During playback of the tracked signal, this tracking signal is filtered through an appropriate frequency band filter. is separated from the information signal. The separated tracking signal is sent to the recording medium. A preferred amplitude and phase comparator circuit for measurement of transducer tracking position error. available. The amplitude of the tracking signal represents the magnitude of the tracking position error, The various phases of such signals allow determination of the direction of the tracking position error. .

25A-23D show a transducer 20 constructed in accordance with the embodiment of FIG. 22 described above. Each track profile obtained by measuring the playback signal output of Show characteristics. For example, a track 633 with a width of α006 inches is a magnetic tape. The tape is pre-recorded longitudinally on tape 42, and the tape is in contact with surface 543 of keeper 228. It is placed as The length of the track 633 is perpendicular to the width W of the physical conversion gap 26. By selectively saturating the transducer front cores 514, 515 and the keeper 228. Thus, each conversion area 56a, 56b is as described above in connection with FIG. They are separated from each other by a backing area 560. graph 635 measures the output signal from the signal winding 25 for each changed position. Then step the tape 42 in the direction of arrow 637 corresponding to the direction W in the transducer. This is a plot obtained by moving the track 635 recorded in .

In this example, the track is moved in steps of 1005 inches. No. As is clear from Figure 25D, the characteristic 635 has two peaks, and each peak The mark is one conversion area 56a shown in FIG. 23B.

56b. As is also evident from the shape of feature 635, areas 56a and and 560 and between zones 560 and 56b. The transition between the forces is also extremely similar to the transition on the other side of areas 56a and 56b, which is not a sharp transition. Very sharp. This provides a backing area 560 in close proximity to the conversion area 56. Thus, it corresponds to the above-mentioned features that improve the "disambiguation" of the tracks.

A plot of the second characteristic 636 is shown in diagram 123D by a dotted line. This program Lot changes the value of the control currents II, I2 coupled to the control signal windings 38 and 39. and thereby transform areas 56a, 5 in the direction of arrow 558 shown in FIG. 23B. 6b and backing area 560 in FIG. 23C as 56a', 56b' and 6 obtained by shifting to a new position as indicated by 0'. 23rd C As is clear from the figure, the width of each of these areas in direction W does not vary substantially. I can't stop.

The measurements described above are repeated for the shifted area and the measurements are taken as characteristic 636. is plotted.

Properties 655 and 656 are similar, each with N, R; P for property 635. , 8 and for the characteristic 636 are denoted N', R', P', S'. Each has a high output peak portion. These parts are converted respectively Area 56a.

56b, 56a', and 56b'. Furthermore, the characteristics of each backing Area! Corresponding to MO, 660', for characteristic 635 a lower output, i.e. each part R , P and the characteristic 636 has R', P'.

24 and 25 illustrate another embodiment of a transducer 20 for use in accordance with the present invention. show. The transducer 20 of FIG. 24 has front cores 594, 595 and having back cores 596, 597 and the points where they abut at opposing planes 598 and 600; and two abutting cores 591 similar to the cores 511, 512 of the embodiment of FIG. ,592. However, the cores 591 and 592 are not wedge-shaped. It is rectangular.

Each back core 596, 597 houses a respective control winding 606-609. Between them two grooves are used as control winding windows 602-605 to It has three legs that form. In this embodiment, the keeper 228 is shown in FIG. It consists of a thin, soft magnetic material with similar properties as described above in connection.

Each control winding 606-609 is connected to saturation controller 54 ( Figure 16). Preferably, for convenience, they are arranged diagonally on opposite sides. The two control windings are interconnected as shown in FIG.

The operation of converter 20 of FIG. 24 will now be described in connection with FIG. 25. Figure 25 is a front view of keeper 22B of FIG. 24 taken in the direction of arrow 623; Rear Ko It extends between the front cores 596 and 597 and the keeper 228 via the front cores 594 and 595. To facilitate illustration of control flux paths 624-627, the rear core is a keeper. by 90° to have their lateral surfaces 628.629 extending in the plane of 228 It is shown rotated. The control windings 606-609 are The outer legs of each back core constitute magnetic poles of the same polarity and the inner legs have different polarities. It is connected to the saturation controller 54 (FIG. 16) so as to have polarity. At the same time, each The rear cores 596, 597 have respective outer and inner surfaces as shown in FIG. It has oppositely oriented magnetic poles formed by side legs. The result of such an opposite orientation is , directed in the opposite direction extending into the virtual conversion gap portion 529 of the keeper The magnetic flux lines 624-627 are obtained.

Back core 59 due to oppositely oriented magnetic poles spanning transducing gap 529 The respective control flux paths generated at 6,597 are as shown in FIG. Portion 56a of keeper 228 that bridges physical conversion gap 26 (FIG. 24) to , 56b and 56c, the control fluxes oriented in opposite directions approach each other, saturating only 56b and 56c. In such locations, separate magnetic flux paths 624-62 are provided as shown in FIG. Repulsed by 7 and branched out. Each thus branched magnetic flux path When this happens, it returns to the same rear core. As a result of the magnetic flux bifurcation mentioned above, Each backing region 56a, 56b has an adjacent saturated region 56a-56c. Formed to separate. These banking areas are similar to converting regions 560, but where they are formed along the width of transducing gap 529. The manner in which the inner virtual conversion area 56b is moved is different. ing. The two outer sections 56a and 56C are connected to passages 624, 625, 626 and and 6270 control signal windings 606, 607, 608 . by the same amount in response to differential changes in the control currents II and I2 applied to Q and 609. Their ends proximate to backing regions 560a and 560b (FIG. 24) The length changes in the opposite direction at . This opposing change in the opposing control flux is the length A virtual conversion area along the width of the conversion gap 26 in the direction of the outer area that shortens the area. The area 56b is moved.

As discussed above in connection with FIG. 22, the magnetic flux density of the backing regions 56a, 56b is also much lower than the saturation density of keeper 228. Because of this, the physical conversion gap The portion of the keeper 228 between the areas 56a and 56b that bridges the keeper 26 is a backing area. It does not saturate in the range.

As is clear from the above description, the converter 20 shown in FIGS. 24 and 25 has a magnetic flux are separated from each other by a region where there is little or no backing area 56a, 56b. Three saturation gap regions or areas 56a-56 are provided in the keeper 228. It has c. Keeper 228 and lower front core 59 surrounding the saturated gap region The saturated portion 56 remains unsaturated and highly transparent. a-56c Respective transformations similar to those described above in connection with Figures 21-23 Areas 56a-56c are provided.

If desired, the outer conversion zones 56a and 56c convert the front cores 594, 595. This can be omitted by measuring the interval at a certain distance from the keeper 228 at both ends of the exchanger W. You may be Cores 594 and 595 are between back core 596 and 597 and keeper 228 while still providing the necessary magnetic flux path at 56a and 56c. In order to increase the reluctance of the magnetic flux path. In another aspect, the reduced width magnetic A magnetic recording medium, such as magnetic tape 42 (FIG. 1), is used as a transducer between lines 651 and 652. The conversion areas 56a and 56C cover only a portion of the tape 42. may be used to prevent information signals from being transferred.

As is clear from FIG. The control windings arranged in the directions are connected together so that they receive the same control current. this Therefore, the conversion areas 56a, 56b and 56c are placed over the width of the conversion gap 529. To move in the vertical direction, the control current of one polarity (e.g. 11', I2'') increases The control currents II', I2' of opposite polarity are related to Fig. 21-13. are reduced in the same manner as described above.

As can be seen from the above description of various embodiments, the present invention provides tracking control. Tracking of a magnetic transducer with respect to a magnetic recording medium without relying on mechanical deflection of the device Allows precise control of the king. Furthermore, such control requires that the information signals are The conversion area of the transducer and the recording medium are transferred at relative transducer-to-recording medium speeds. This can be done to maintain alignment between the bodies. The tape feed speed and direction are different. The preferred embodiment is modified to achieve a relative transducer-to-recording medium speed of Although described, the method and apparatus of the present invention can be used to achieve any different relative velocities. The system may be configured to perform such control regardless of the situation. For example, data It is common practice to vary the rotational speed of a rotary transducer to achieve compression and expansion. It is. The method and apparatus of the present invention may be used in such applications to records and plays back tracks along the tape in a predetermined format Apply oil to the tape so that it changes with respect to the selected path extending in the predicted direction. exchangers can be maintained in alignment.

The present invention also provides a method for generating a special motion effect from a television information signal. configured to transfer information signals on a magnetic tape using a rotatable transducer; However, two or two can also be configured to control more than one rotatable transducer. this In applications such as The reset method used to determine when to request a reset will change. Such a method of the present invention The configuration gives more time to perform the reset, so the reset is more gradual. become secondary. Furthermore, the present invention provides that the length of the path through which the control magnetic flux flows and the control magnetic flux are The variation of the flowing cross-sectional area is dependent on achieving the desired reluctance gradient. has been described in connection with a preferred embodiment as described above. However, generally the above so that the saturation flux density in the core body of the transducer achieves the desired reluctance gradient. can be changed for. This variation corresponds to the magnetic permeability of different saturation flux densities. This can be achieved by constructing the core body of a permeable material. In doing this , so that materials with different saturation flux densities cannot have widely varying permeability properties. It is preferable to select a material with a suitable coercive force.

For example, the embodiments of transducer 20 shown by Figures f8A, 18B and 180 Each of the five transducer sections 150a, 150b and 150C has a different saturation. Constructed from a magnetically permeable material with a magnetic flux density of K and each transformation The width of the conversion gap 26 varies depending on the application of the same level of control magnetic flux. can be made to travel different distances along.

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Claims (1)

[Claims] (1) By means of a transducer for transmitting an information signal with respect to a magnetic recording medium and controlled such that the information signal traces a selected path along the recording medium during said transfer. (a) a magnetic transducer arranged to transfer information signals with respect to a magnetic recording medium; a body of a gas permeable material and a winding disposed in electromagnetic coupling to the magnetic flux path, the body forming a conversion gear for magnetically coupling the magnetic flux path to the magnetic recording medium. (b) coupled to the magnetic transducer and responsive to a control signal, selected segments of the gap enable transfer of information signals between the magnetic recording medium and the winding; (c) saturation control means for magnetically saturating selected regions of said body portion such that said selected segments are magnetically saturated; The above selection of the gears causes the relative motion to trace a path along the recording medium. (d) providing a generator for generating said control signal and applying it to said saturation control means; said control signal, when coupled to said saturation control means, directs a transducer gear oriented such that said activated selected segment follows said selected path; and being adapted to vary according to the deviation of the selected segment of the gear wheel from the selected path so as to cause a corresponding movement of the activated selected segment along the gear wheel. The above method. (2) In the method recited in claim 1, an upward Sensing hand for sensing deviation of activated selected segment of gear and the generator is responsive to the sensing means to detect the activated selection. said defined segment such that the segment follows the selected path along said recording medium. The method is characterized in that the control signal is varied in accordance with the sensed deviation such that the control signal is caused to move along the detected deviation. (3) The method of claim 2, wherein the magnetic recording medium includes: the information signal from which the position of the selected segment of the conversion gear relative to the selected path can be determined; A signal is recorded thereon prior to transfer by the magnetic transducer, and the sensing means detects the activated selected signal from the selected path in response to the signal previously recorded on the magnetic recording medium. said generator is adapted to give an indication of the deviation in the position of the segment, said generator being adapted to give an indication of the deviation in position of said segment; In response to an indication of the deviation that is given, the control signal is changed according to this indicated deviation. The above-mentioned method is characterized in that (4) The system of claim 3, wherein the transducer is controlled to reproduce information signals previously recorded on the magnetic recording medium along at least one track defining the selected path. said sensing means responsive to said recorded information signal for providing an indication of the deviation of the position of said activated selected segment of said conversion gear from one track during playback of a recorded information signal; Said generator selects said activated selection in response to an indication of deviation provided by said sensing means. varying said control signal in accordance with said indicated deviation such that said segment is moved along said defined conversion gear so as to follow said track; The above-mentioned method is characterized in that (5) In the method described in claim 4, each of the recorded information signals This track is driven by the selected segment of the conversion gear defined above. The path to be traced has a length dimension in the direction along the magnetic recording medium and a width dimension in the transverse direction to this length dimension. having selected length and width dimensions, the magnetic transducer is capable of transducing recorded information. The converter gear is arranged to reproduce an information signal with the length and width of the conversion gear defined above, extending in the respective directions of the length and width of the gear, and generates an instantaneously changing control signal, which is controlled by the saturation control described above. Width of the above-determined conversion gear coupled to the means cyclically moving said activated selected segment of said gear along said width dimension with a corresponding periodic variation of the selected region of magnetic saturation in the direction of the magnetic field, thereby recording. oscillating means for producing a corresponding periodic change in the amplitude or magnitude of the reproduction of the information signal reproduced by the magnetic transducer; The activation and selection of the conversion gear along the width dimension of the track reproducing the information signal is performed in response to changes in the size of the target. The method described above is characterized in that an indication of the deviation of the position of the selected segment is given. (6) In the method described in claim 4, each of the recorded information signals This track is traced by the selected segment of the defined conversion gear. The conversion gear defined above has a length dimension in the direction along the magnetic recording medium and a width dimension in the lateral direction with respect to this length dimension, and the conversion gear defined above has the selected length and width dimension. and the magnetic transducer has the length and width dimensions of the track of recorded information. The conversion gear is arranged to record an information signal with the determined length and width dimensions of the conversion gear extending in each direction, and the sensing means is arranged to record an information signal recorded on the magnetic recording medium. and the detecting means detects the change specified above. The activated selection of the gear knob is moved by a distance along the width dimension of the exchange gear knob. at least one segment offset from the position for reproducing the information signal by the segment arranged to detect an information signal recorded on a magnetic recording medium at a position, said detection means moving with said activated selected width segment to maintain said deflection distance constant. and this deflection distance transmits an information signal when the activated selected gear segment follows the selected path. said detecting means is selected to detect an information signal at the edge of the track on which said signal is recorded, said sensing means detecting a recorded information signal detected by said detecting means; a signal processor for providing an indication of the deviation of the position of the activated selected segment of the conversion gear from the selected path in response to a signal; The above method is a sign. (7) In the system as claimed in claim 6, the body of magnetically permeable material extends respectively into one of the at least two separate width portions of the conversion gear. defining separate magnetic flux paths extending across the width of the magnetic transducer; having separate windings associated with separate magnetic flux paths, one said separate width portion being and the saturation control means includes separate saturation controllers respectively associated with the separate width portion forming the detection means and the other separate width portion of the conversion gear; The transducer is coupled to the magnetic transducer and receives control signals. magnetically saturating one selected discrete region of said body part in accordance with a selected width segment of said associated discrete width portion to reproduce an information signal recorded on said magnetic recording medium; And this is connected to the magnetic flux passing through the above-mentioned related separated width parts. said magnetic transducer forming said detection means. The detecting means is arranged to reproduce an information signal in the separated width portion of the the activated selected width segment of the other of the separated width portions becomes the edge of one recorded track of the information signal when following the selected path; and each saturation controller is coupled to receive said control signal generated by said generator to control said activated selected width segment of said discrete width portion. so that they move together as the signal changes. associated with the magnetic flux path extending through the separate width portion forming the detection means. The above system, wherein the winding is coupled to the signal processor. (8) In the system of claim 7, the body of magnetically permeable material defines separate magnetic flux paths extending respectively into at least three separate width portions of the conversion gear; Two of the separated width parts form the above detection means. and the magnetic transducer transmits information in the two separate width portions forming the detection means. the detecting means is arranged to reproduce a signal indicating that each activated selected width segment of the other of the separated width portions follows the selected path; and a respective saturation controller is positioned at a different edge of the recorded track of the information signal when following the activated selected width set of the discrete width portion. said two components forming said detection means are coupled to receive said control signal generated by said generator such that said component moves together in response to variations in said control signal; The above method, characterized in that the winding associated with the magnetic flux path extending in a separate width portion of the signal processor is coupled to the signal processor. (9) In the method set forth in claim 8, two separate width portions of the conversion gear forming the detection means are located at both ends of the width dimension of the conversion gear determined as described above, and the above-mentioned A third separate width portion of the conversion gear is provided and said activated selection of said two separate width portions at both ends of said conversion gear; The selected width segment is the activated selected width segment of the third separate width portion. The above method is characterized in that the segments are respectively positioned at the edges of the track on which the information signal is recorded when following the selected path. (20) The system according to claim 6, wherein the body of magnetically permeable material each extends into one of the at least two separate width portions of the conversion gear. the magnetic transducer has separate windings associated with the separate magnetic flux paths in the separate width portions, one of the separate width portions forming the sensing means; The saturation control means includes separate saturation controllers respectively associated with the separate width portion forming the detection means and the other separate width portion of the conversion gear, each saturation controller coupled with the magnetic transducer. and the associated fraction in response to a control signal to magnetically saturate selected discrete regions of said body part. one selected width segment of the separated width portions reproduces an information signal recorded on the magnetic recording medium and couples it to a winding associated with a magnetic flux path extending through the associated separated width portion; said magnetic transducer forming said sensing means; and the other of said separate width portions is arranged to reproduce an information signal from an offset position on the magnetic recording medium, the respective activated selected width segments being arranged to reproduce an information signal on the magnetic recording medium. each saturation controller is arranged such that each saturation controller receives a control signal generated by said generator such that activated selected width segments of said separate width portions move together in response to variations in said control signal. tie to receive associated with a magnetic flux path extending through said separate width portions that are combined and form said detection means. The above system, wherein the winding is coupled to the signal processor. (11) In the system according to claim 1, the generator is configured to generate a first control signal. a signal generator and a second control signal generator, the first control signal generator being selected. the saturable control means generates a first control signal having a magnitude of selection of the body portion as determined by the magnitude of the first control signal in response to a control signal; activating the selected segment of the gear wheel, and the second control signal generator generates a second control signal of a magnitude that varies according to the deviation of the selected segment of the gear wheel from the selected path. The saturation control means responds to the second control signal. altering the selected region of the body that is saturated according to a change in magnitude of the second control signal, thereby increasing the activated selected region along the gear; The method described above is characterized in that the corresponding movement of the segment is performed. (12) In the method described in any of claims 1 to 11, the body of the magnetic transducer has a surface, the body defines the transducer gear on that surface for magnetically coupling the magnetic transducer to the magnetic recording medium; The saturation control means is coupled to the magnetic transducer to selectively increase the magnetic transducer over a region of its surface. magnetically saturating the recording portion and defining a magnetically unsaturated region of the surface on either side of the selected segment of the gear; segment is used to carry out the transfer of information signals related to the recording medium. The method described above is characterized in that the magnetic transducer can be magnetically coupled to a magnetic recording medium. (13) The magnetic tape and the rotary transducer are positioned close to each other and the information The transducer follows a track along the tape when transmitting the signal. information regarding a plurality of separate tracks positioned to extend along the tape transverse to its length dimension when controlled to trace a single path; A system for transmitting an information signal, comprising: (a) a magnetic transducer arranged for transmitting an information signal with respect to said magnetic tape, said magnetic transducer having one magnetic flux conductor; a body of magnetically permeable material for defining a magnetic flux path and a winding disposed in electromagnetic coupling relation to the magnetic flux path, the body for magnetically coupling the magnetic flux path to the tape; (b) defining a transducer gear of selected length and width dimensions; (b) said gear coupled to said magnetic transducer and adapted to transfer information signals to and from said tape and said winding in response to a control signal; saturation control means for magnetically saturating one selected area of said body part to activate one selected width segment of said body part; (c) providing a rotatable member for rotating the magnetic transducer with respect to the tape during transfer of information signals regarding the tape, mounting the magnetic transducer on the rotatable member, and length dimension of the gear; extends in the direction of rotation of the magnetic transducer such that a selected width segment of the gear engages the tip during rotation of the magnetic transducer. Trace the path along the tape in the direction of the track extending along the tape. (d) generating said control signal and coupling it to said saturation control means; a generator for controlling the saturation control means, the control signal varying according to the deviation of the selected width segment of the gear from the track followed along the tape; The activated selected width segment is The method is characterized in that it causes a corresponding movement of the activated selected width segment along the defined conversion gear in the direction of the width segment to follow the rack. (14) In the method recited in claim 13, the The activated selected segment of the gear from the track being The generator is equipped with a sensing means for sensing the deviation of the sensor. Depending on the stage, the activated selected segment should follow the track. The method is characterized in that the control signal is varied in accordance with the sensed deviation such that the control signal is caused to move along the defined conversion gear. (15) In the method described in claim 14, a signal is recorded on the magnetic tape by the magnetic transducer prior to the transfer of the information signal, and from the signal, a track being followed is recorded. The position of the selected segment of the conversion gear may be determined, and the sensing means may detect the previously recorded signal on the tape. The above activated selected segment from the track being followed according to the issue said generator provides an indication of the deviation in the position of The method described above is characterized in that, in response to an instruction for the deviation, the control signal is changed in accordance with the specified deviation. (16) The system as claimed in claim 15, wherein the transducer is controlled to reproduce an information signal previously recorded along the track being followed, and the sensing means is controlled to reproduce an information signal previously recorded along the track being followed. the position of the activated selected segment of the conversion gear from the track during playback of the recorded information signal in response to the information signal; and the generator is adapted to vary the control signal in accordance with the indicated deviation in response to an indication of the deviation given by the sensing means. The above method is characterized by: (17) In the method recited in claim 16, the recorded information signal is Each track is driven by a selected segment of the conversion gear defined above. The length dimension of the path to be traced in the direction along the magnetic recording medium and this length dimension. the selected transducer gear has a selected length and width dimension, and the magnetic transducer is arranged to reproduce the information signal. The length and width dimensions of the conversion gear obtained are extended in the respective directions of the length and width dimensions of the track of recorded information, and a control signal that changes periodically is generated and coupled to the saturation control means to perform the above-described control signal. Magnetic saturation in the direction of the width dimension of the conversion gear along the above width dimension with a corresponding periodic variation of the selected area of the sum. cyclically moves the activated selected segment of the gear to make a corresponding periodic change in the amplitude of the reproduction of the recorded information signal. The sensing means is further provided with an oscillating means for causing the magnetic transducer to A truck that reproduces an information signal according to the above-mentioned periodic amplitude fluctuation of the information signal that is reproduced. Said activated selected segment of said conversion gear tooth along the width dimension of the tooth. The method described above is characterized in that it gives an indication of the deviation of the position of the point. (18) In the method recited in claim 16, the recorded information signal is Each track is driven by a selected segment of the conversion gear defined above. The path to be traced has a length dimension in a direction along the recording medium and a width dimension in a lateral direction with respect to this length dimension, and the determined conversion gear has a selected length and width dimension. information on which the length and width dimensions of the conversion gear defined above are recorded. The above-mentioned magnet is stretched in the direction of the length and width of the above-mentioned track of the information. a magnetic transducer is arranged to reproduce the information signal, and the sensing means is arranged to reproduce the information signal, and the sensing means a detecting means for detecting an information signal recorded in the body, said detecting means detecting said activation of said gear for a distance along said width dimension of said conversion gear The selected segments deviate from the position of reproducing the information signal. is also arranged to detect the information signal recorded on the magnetic recording medium at one position. and said sensing means is arranged to move with said activated selected width segment to maintain said deflection distance constant, said deflection distance being equal to said gear. said detection means detect an information signal at the edge of the track on which the information signal is recorded when said activated selected segment of the block follows a track; and said sensing means provides an indication of the deviation of the position of said activated selected segment of said conversion gear from a track being followed in response to a recorded information signal detected by said sensing means. The above method is characterized in that it includes a signal processor for providing the signal. (19) In the system according to claim 13, the magnetic tape is a length dimension of said tape to effect a net velocity relative movement between said selected width segment of said gear of said transducer and said tape as a function of the feed rate of said transducer and the rotational speed of said transducer; is sent through the above rotating magnetic transducer in the direction of and wherein said track is at a selected angle with respect to the length of the tape at a first net velocity, said first net velocity being different from said first net velocity during transfer of information signals to said tape. Means are further provided for adjusting to a different second net speed, the generator configured to adjust the speed along the width dimension of the gear so as to follow a track during the transfer of an information signal associated with that track. the width dimension of the gear to cause the movement of the activated selected width segment and, following said transfer, to position it so that it begins to follow the track from which the subsequent transfer of the information signal occurs. said method characterized in that said control signal is varied to cause said activated selected width segment to move along said width segment; (20) In the system according to claim 19, the generator has one track. a first control signal for generating a first control signal that varies to move the activated selected width segment along the width dimension of the gear so as to follow the track during the transfer of an information signal associated with the gear; 1, and a first variable width segment adapted to move the activated selected width segment along the width dimension of the gear to position it to begin following the track on which the subsequent transfer of the information signal is to occur. and second means for selectively generating two control signals. (21) The method according to claim 19 or 20, wherein the control signal is changed in accordance with the speed difference. (22) In the system of claim 19, sensing means for sensing a deviation of said activated selected width segment of said gear from a track being followed along said tape. is further provided, and the above generator is in response to sensing means for causing said activated selected segment to move in a direction along said defined translation gear against said deviation; The control signal is changed according to the detected deviation. Notation method. (23) In the system according to claim 22, the generator includes a first control signal generator and a second control signal generator, and the first control signal generator includes a first control signal generator and a second control signal generator. 1 control signal, which is responsive to the sensed means, in accordance with the sensed deviation of the activated selected width segment of the gear from the track being followed along the tape. and the second control signal generator changes the first control signal in response to the transfer of an information signal associated with one track. The activated selected width segment is moved so as to follow the , and following the above transfer, a subsequent transfer of information signals occurs. generating a second control signal that varies to cause movement of said activated selected width segment to position it to begin following a track; said saturation control means responsive to said control signal; The upper limit is saturated as the control signal changes above. The method described above is characterized in that the selected area of the writing section is changed. (24) In the method recited in claim 23, the magnetic tape includes a position of the selected segment of the conversion gear with respect to a track being followed. A signal whose position can be determined is transmitted by the magnetic transducer to the magnetic transducer. recorded prior to transmission of a signal, said sensing means giving an indication of the deviation of the position of said activated selected segment from the track being followed in response to a signal previously recorded on tape; The first control signal generator is applied to the sensing means. The method described above is characterized in that the first control signal is changed in accordance with an instruction of a deviation given. (25) In the system as set forth in claim 24, the transducer is controlled to reproduce previously recorded information signals along a track being followed, and the sensing means is configured to record information signals. When playing back the recorded information signal according to the information signal being The activated selected segment of the conversion gear from the track to said method, characterized in that said generator changes said control signal in accordance with the indicated deviation in response to an indication of deviation given by said sensing means. (26) In the system according to claim 25, the magnetic transducer is The control signal is arranged to reproduce the information signal in such a manner that the length and width dimensions of the conversion gear set are extended in the respective directions of the length and width dimensions of the recorded information track, and the control signal changes periodically. is generated and coupled to the saturation control means to control the above-mentioned The corresponding circumference of the selected region of magnetic saturation in the direction of the width dimension of the conversion gear cyclically moving said activated selected segment of said gear along said width dimension with a periodic change, thereby producing a corresponding periodic change in the amplitude of reproduction of the recorded information signal; The sensor further includes an oscillation means for generating The stage converts the information signal into the activation of the conversion gear along the width dimension of the reproduction track in response to the periodic amplitude change of the information signal reproduced by the magnetic transducer. The method described above is characterized in that an indication of the deviation of the position of the selected segment is given. (27) In the method recited in any of claims 13 to 20 or 22 to 26, the body of the magnetic transducer has one surface, and the body has one surface. the transducer gear is defined on a surface for magnetically coupling the magnetic transducer to a recording medium; the saturation control means is coupled to the magnetic transducer to magnetically couple the body over a region of the surface; The above-mentioned gears on both sides selectively cause saturation. Define the magnetically saturated region of the above surface in close proximity to the selected segment of the bush. The selected segment carries out the transfer of information signals in relation to the recording medium. The method described above is characterized in that the magnetic transducer is magnetically coupled to the magnetic recording medium. (28) capable of reproducing and transmitting information signals recorded along parallel tracks extending transversely to the magnetic tape at an angle to the length dimension of the magnetic tape to and through the conversion location; A rotating segmented scanning magnetic tape in which the information signal is reproduced by a rotating transducer arranged in translation relationship with respect to the magnetic tape. (b) a body of magnetically permeable material defining a magnetic flux path and an electromagnetic coupling relationship with the magnetic flux path; a magnetic transducer comprising windings arranged in a magnetic field, said body comprising a transducer gear of selected length and width dimensions for reproducing information signals from the tape; (c) coupled to the magnetic transducer and responsive to a control signal; magnetically saturating selected areas of said body and coupling said windings such that selected width segments of said tape can reproduce information signals from said tape; (d) providing saturation control means for controlling the information signal on the tape; a rotatable part for rotating the magnetic transducer relative to the tape at the transducing station; The magnetic transducer has a length dimension of the gear that corresponds to the direction of rotation of the magnetic transducer. The selected width segment of the gear is connected to the magnetic variable along said tape in the direction of the track that extends along said tape when the converter rotates. (e) generating the control signal and controlling the saturation control signal; a generator for coupling to the saturation control means, the control signal being varied in accordance with the deviation of the selected width segment of the gear from the track being followed along the tape; Upon binding, the activated selection up in the direction of the above width dimension so that the selected width segment follows the above track. a rotating segmented scanning magnet adapted to cause a corresponding movement of said activated selected width segment along a defined translation gear; air tape device. (29) The apparatus according to claim 28, wherein the activated selected set of the gear from a track being followed along the tape. The generator further comprises sensing means for sensing deviations in the component. in response to the sensing means for causing said activated selected segment to follow said track and move along said defined translation gear; The apparatus is characterized in that the control signal is varied in accordance with the sensed deviation. (30) The apparatus of claim 29, wherein said sensing means detects a deviation in position of said activated selected segment of said conversion gear from said track in response to said recorded information signal. The above-mentioned device is characterized in that it gives instructions. (31) In the device according to claim 30, a control signal that changes periodically. generates a signal and connects it to the saturation control means when reproducing the information signal from the tape. In addition, the selected region of magnetic saturation in the direction of the width dimension of the conversion gear defined above. The activation of the gear tooth along the width dimension causes a corresponding periodic change in the area. cyclically moving the selected segment that has been modified, thereby reproducing the information signal. further comprising oscillating means for producing a corresponding periodic change in the raw amplitude, said sensing means for reproducing the information signal in response to the periodic amplitude change in said reproduced information signal. said activated selected section of said conversion gear along the width dimension of said track. The above device is characterized in that it gives an indication of the deviation of the position of the component. (32) In the device according to claim 28, the magnetic tape is effecting a net velocity relative movement between the tape and the selected width segment of the gear of the transducer depending on the feed rate of the tape and the rotational speed of the transducer; the track being at a selected angle relative to the length of the tape at a first net velocity and transmitting information signals; further comprising means for adjusting the first net speed to a second different net speed when playing a track, the generator adjusting the first net speed to a different second net speed when playing an information signal associated with a track; the activated selected width segment is changed to cause movement of the activated selected width segment along the width dimension of the gear so as to follow, and following this playback, subsequent playback of the information signal follows the track in which it is to occur; Let's start said upper apparatus generating said control signal that varies to effect movement of said activated selected width segment along said width dimension of said gear tooth to position said gear. (33) In the device according to claim 32, the generator includes one truck. The activated selected width segment is changed to move the activated selected width segment along the width dimension of the gear block to follow the track when playing an information signal regarding the gear block. a first means for generating a first control signal for generating an information signal; and a first means for generating a first control signal along a width dimension of the gear for positioning the signal to begin following the track from which the subsequent reproduction of the information signal occurs. and second means for selectively generating a second control signal for moving the selected width segment. The above device. (34) The device according to claim 32 or 33, wherein the control signal is changed in accordance with the speed difference. (35) The apparatus of claim 32, wherein sensing means for sensing a deviation of said activated selected width segment of said gear from a track being followed along said tape. further comprising: the generator being responsive to the sensing means to determine whether the activated selected segment corresponds to the deviation; The apparatus is characterized in that the control signal is varied in accordance with the sensed deviation so as to cause movement in a direction along the defined translation gear. (36) The device according to claim 35, wherein the generator includes a first control signal generator and a second control signal generator, and the first control signal generator includes a first control signal generator and a second control signal generator. 1 control signal and follow along said tape in response to said sensing means. The activated selected width set of the gear from the closed track. the first control signal is varied in accordance with the sensed deviation of the track component, and the second control signal generator is activated to follow a track during reproduction of an information signal relating to the track. Causes the selected width segment to be moved. The information signal changes and its regeneration is followed by the subsequent regeneration of the information signal. generating a second control signal that varies to cause movement of the activated selected width segment to position it to begin following the saturation segment; Apparatus as described above, characterized in that the sum control means varies, in response to the control signal, the selected region of the body part that is saturated in accordance with variations in the control signal. (37) The apparatus of claim 36, wherein said sensing means detects a deviation in position of said activated selected segment of said conversion gear from said track in response to said recorded information signal. The above-mentioned device is characterized in that it gives instructions. (38) In the device according to claim 37, a control signal that changes periodically. This signal is combined with the above saturation control signal when reproducing the information signal from the tape. Corresponding to the selected region of magnetic saturation in the direction of the specified conversion gear width dimension. cyclically moving said activated selected segment of said gear along said width dimension to effect a corresponding periodic change in the amplitude of reproduction of the information signal; further comprising oscillating means for detecting the activation of the conversion gear along the width dimension of the track for reproducing the information signal in response to periodic amplitude changes of the reproduced information signal. Selected segment position The above device is characterized in that it gives an indication of deviation in position. 39. The apparatus of claim 38, wherein said net speed adjusting means adjusts the speed at which tape is fed through said converting location to select said width segment of said gap between said tape and said magnetic transducer. A device as described above, characterized in that it produces a second net velocity of relative movement between. (40) Claims 32, 33 or 35-37 In the described apparatus, the net speed adjusting means adjusts the speed at which the tape is fed through the converting station to adjust the second width of the relative movement between the tape and the selected width segment of the gear of the transducer. The above-mentioned device is characterized in that it produces a net velocity of. (41) In the device according to any one of claims 28-33 or 35-39, the body of the magnetic transducer has one surface, and the body of the magnetic transducer has one surface. defines the transducer gear on its surface for magnetically coupling the magnetic transducer to a magnetic tape, and the saturation control means is coupled to the magnetic transducer and extends over a region of the surface of the body. selectively causing magnetic saturation to define magnetically unsaturated areas of said surface proximate selected segments of said gear on each side; A device as described above, characterized in that selected segments of the magnetic transducer are capable of magnetically coupling the magnetic transducer to a magnetic tape for reproduction of information. (42) Stretching a magnetic tape diagonally across it at an angle to its length. In a helical-scan tape apparatus for transmitting information signals on parallel tracks extending along the magnetic tape, the magnetic tape comprises: (a) a cylindrical surface; along a helical path around a surface at a given helix angle with respect to the associated axis. (b) a feeding mechanism for feeding the magnetic tape in the direction of its length along a path extending through the helical path; (c) a magnetic tape guide for defining a magnetic flux path; at least one magnetic transducer including a body of material permeable to the tape and a winding disposed in electromagnetically coupled relationship with the magnetic flux path, the body magnetically coupling the magnetic flux path to the tape. Variation of selected length and width dimensions for (d) magnetically saturating selected areas of said body such that selected width segments of said gear are capable of transferring information signals between said tape and said windings; coupled to the above magnetic transducer in order to (e) saturation control means are provided for controlling said helicopter in which the transfer of information signals occurs with respect to the tape; The magnetic field about the tape around the axis of rotation through the conversion location along the cull path. a rotatable member for rotating a magnetic transducer, the magnetic transducer being mounted to the rotatable member such that the magnetic transducer is in a transducing relationship to the tape as the transducer passes through the transducing location; The transducer has a selected width segment of the gear that is connected to the magnetic field. The passage along the tape in the direction of the track that extends along the tape as the air transducer rotates. (f) generating the control signal and transmitting it to the saturation control means; A generator is provided for coupling, and the control signal is the selected width set of the gear from the track being made to follow along the the selection which is activated upon coupling of said saturation control means. Pairing of the activated selected width segments along the defined translation gear in the direction of the width dimension such that the selected width segments follow the track. The above-mentioned helical scanning tape device is characterized in that the helical scanning tape device is configured to perform a corresponding movement. Place. (43) In the device according to claim 42, the device is configured to follow the tape along the tape. said activated selected set of said gear from said track being The generator further comprises sensing means for sensing deviations in the responsive to the sensing means, the activated selected segment is sensed to be moved along the defined translation gear to follow the track; The device as described above, characterized in that the control signal is changed in accordance with the known deviation. (44) In the device according to claim 43, the magnetic tape can be tracked. The position of the above selected segment of the conversion gear relative to the track being A signal whose position can be determined precedes the transfer of an information signal by said magnetic transducer. and wherein said sensing means provides an indication of the deviation of the position of said activated selected segment from the track being tracked in response to said signal previously recorded on tape; Apparatus as described above, characterized in that the generator is responsive to an indication of the deviation given by the sensing means and varies the control signal in accordance with this indicated deviation. (45) The apparatus of claim 44, wherein the transducer is controlled to reproduce an information signal previously recorded along the track being followed, and the sensing means is arranged to reproduce an information signal previously recorded along the track being followed. When playing back an information signal recorded in response to a recorded information signal. The activated selected segment of the conversion gear from the track to said generator provides an indication of the deviation of the position of said object; The device as described above, characterized in that in response to an indication of a difference, the control signal is varied in accordance with the indicated deviation. (46) In the device according to claim 45, a control signal that changes periodically. generating a signal and coupling this control signal to the saturation control means during reproduction of the information signal from the tape to produce a corresponding synchronous control signal in the selected region of magnetic saturation in the direction of the width dimension of the transducer gear defined above; Make the change and place it on the gear lug along the width dimension above. cyclically moves the activated selected segment and thereby transmits information. further comprising oscillating means for causing a corresponding periodic change in the amplitude of the reproduction of the information signal; The invention is characterized in that an indication of the deviation of the position of the activated selected segment of the conversion gear is given along the width dimension of the track. The above device. (47) In the device according to claim 42, the magnetic tape is moved above the gear of the converter depending on the feeding speed of the tape and the rotational speed of the converter. the helical path to effect a relative movement in net velocity between the selected width segment and the tape, the track having a length dimension of the tape at a first net velocity; The selected angle is further comprising means for adjusting the net speed to a second net speed different from the first net speed during the transmission of information signals regarding the gear; causing movement of the activated selected width segment along the dimension to follow the track during the transfer of the information signal with respect to a track; and following the above transfer, the above activity along the width dimension of the gear tooth changes. The subsequent transfer of the information signal is performed by moving selected width segments that have been differentiated. A device as defined above, characterized in that it generates said control signal which varies in such a way as to cause the positioning to begin following the track on which the feed has to occur. (48) In the device according to claim 47, the generator includes one truck. and moving the activated selected width segment along the width dimension of the gear so as to follow the track during the transfer of information signals associated with the gear. a first means for generating a first control signal for transmitting an information signal; Move the activated selected width segment along the width dimension of the gear and second means for selectively generating a second control signal that varies so as to change. (49) In the device according to claim 48, the second means includes the magnetic The device is characterized in that it generates the second control signal for a predetermined time during rotation of the gas transducer. (50) In the device according to claim 49, the first control signal is movement of the activated selected width segment in a first direction parallel to the axis of rotation; the activated selected width in a second direction parallel to the axis of rotation in the first direction; The above-mentioned device is characterized in that it changes to cause movement of the segment. (51) In the device according to claim 50, the rotation of the rotary magnetic transducer further comprising a tachometer operatively coupled to the rotatable member for generating a tachometer signal indicative of position displacement, the second means being responsive to and determined by the tachometer signal. The second control signal is generated at a time of The above-mentioned device, characterized in that it initiates life. (52) In the device according to claim 51, the second control signal is generated. Raw time is when the above activated selected width segment is outside the above transform location. The above-mentioned device is characterized in that it corresponds to the time of the day. (53) The device according to claim 52, wherein the control signal is changed in accordance with the speed difference. (54) In the device according to claim 47, the device is configured to follow the tape along the tape. The activated selected width segment of the gear from the track being further comprising sensing means for sensing a deviation in the actuator, the generator being responsive to the sensing means to cause the activated selected width segment to counteract the deviation; The device is characterized in that the control signal is varied in accordance with the sensed deviation to cause movement along the defined conversion gear. (55) In the device according to claim 54, the generator includes a first control signal generator and a second control signal generator, and the first control signal generator includes a first control signal generator and a second control signal generator. said first control signal in accordance with a sensed deviation of said activated selected width segment of said gear from a track being followed along a tape in response to said sensing means; change the signal and generate the second control signal. The generator changes only when an information signal relating to a track is transferred, causing the activated selected width segment to move to follow that track. The above transfer must be followed by a subsequent transfer of the information signal. Selected width set activated above to position the track to begin tracking. said saturating control means is responsive to said control signal to cause said selected region of said body part to be saturated in accordance with a change in said control signal; The above-mentioned device is characterized in that it changes. (56) In the device according to claim 55, the magnetic tape is A signal by which the position of the selected segment of said converting gear with respect to the track being sought can be detected is recorded by said magnetic transducer prior to the transfer of the information signal, said sensing means being connected to said tape beforehand. Follow according to the recorded signal the first control signal generator provides an indication of the deviation of the position of the activated selected width segment from the track being tracked; The device as described above, characterized in that the first control signal is changed in response to an indication of a difference. (57) The apparatus of claim 56, wherein the transducer is controlled to reproduce a previously recorded information signal along the track being followed, and the sensing means is configured to reproduce a previously recorded information signal along the track being followed. When playing back the information signal recorded according to the information signal providing an indication of the deviation of the position of the activated selected width segment of the conversion gear from the track; The above device, characterized in that the control signal is changed according to. (58) In the device according to claim 57, the first control signal generator activates the signal along the width of the gear so as to follow one track when reproducing the information signal. a first step for generating a first component of the first control signal that varies to move the selected width segment; moving the activated selected width segment along the width dimension of the gear so that it is positioned to begin following a track containing a step and in which subsequent reproduction of the information signal is to occur; Apparatus as described above, characterized in that it includes second means for selectively generating a second component of said first control signal that varies. (59) The apparatus according to claim 58, wherein the second means generates the second component for a predetermined time during rotation of the magnetic transducer. The above device characterized by: (60) In the device according to claim 59, when the first control signal is said first component varies monotonically at a first velocity to effect movement of said activated selected width segment in a first direction parallel to said rotational axis; The second component of the signal is varied to cause movement of the activated selected width segment in a second direction parallel to the axis of rotation in the first direction. The above device characterized by: (61) The device according to claim 60, wherein the rotation of the rotary magnetic transducer is further comprising a tachometer operatively coupled to said rotatable member for generating a tachometer signal indicative of position displacement, said second means generating said tachometer signal; The apparatus is characterized in that it starts generating the second component of the first control signal at a time determined by the tachometer signal in response to a signal. (62) In the device according to claim 61, when the first control signal is The time of occurrence of the second component is such that the activated selected width segment is A device as described above, characterized in that it corresponds to times outside the exchange area. (63) The apparatus of claim 62, wherein the net velocity adjusting means produces a second net velocity relative movement between the tape and the selected width segment of the gear of the magnetic transducer. the second means includes a ramp generator and a reset generator, the ramp generator adjusting the speed at which the tape is fed through the converting station so as to adjust the speed at which the tape is fed through the converting station; There is a generating the first component of the first control signal such that the reset generator has a magnitude that varies at a predetermined time determined by an adjusted tape advance rate; generating the second component of the first control signal; The above device as a sign. (64) The device according to claim 63, wherein the tape covers the conversion area. The speed sent through the ramp is a constant speed different from the normal speed, and the above ramp the first component of the first control signal generated by the generator varies linearly in magnitude and has a period proportional to the difference between the constant speed and the normal speed; The apparatus characterized in that the second component of the first control signal generated by the reset generator has a frequency proportional to the difference between the constant speed and the normal speed. (65) The above normal speed corresponds to the speed at which the tape was sent to record the information signal. The above device characterized in that: (66) In the device according to claim 64, a control signal that changes periodically. generates a signal and couples it to the saturation control means during reproduction of the information signal from the tape. A pair of the above selected regions of magnetic saturation in the direction of the width dimension of the conversion gear specified. The activation of the gear along the width dimension is performed by making corresponding periodic changes. further comprising oscillating means for periodically moving selected segments of the information signal thereby causing a corresponding periodic change in the amplitude of the reproduction of the information signal, the sensing means being configured to detect the reproduction of the information signal; an information signal is regenerated in response to the periodic amplitude variation of the activated selected width set of the conversion gear along the width dimension of the track; The above device is characterized in that it gives an indication of the deviation of the position of the component. (67) The device according to any of claims 42 to 66, wherein the body of the magnetic transducer has one surface, and the body connects the magnetic transducer to a magnetic tape. The conversion gear is defined in the above plane for magnetic coupling, and the saturation control means is set in the above plane. coupled to a magnetic transducer for selectively magnetically saturating the body over the slope of the surface and magnetically unsaturated regions of the surface proximate selected segments of the gear on each side; said magnetic transducer is capable of being magnetically coupled to a magnetic tape in order to determine and cause said selected segment to effect reproduction of an information signal. (68) Magnetically movable sensor for transferring information signals with respect to a magnetic recording medium a body of magnetically permeable material defining a transducer gear having a transducer having a transducer for controlling the path traced along the magnetic recording medium by the magnetic transducer; said magnetic transducer when an information signal is transferred in relation to a track along said magnetic recording medium followed by said magnetically movable segment of said transducer gear. and relatively moving a magnetic recording medium, sensing a deviation of said magnetically movable segment with respect to said track being followed, and moving said magnetically movable segment up along said translation gear in response to said sensed deviation. said method comprising moving said movable segment of said conversion gear; (69) Magnetically movable segment for transferring information signals with respect to magnetic recording media A method for providing control of a path traced along a magnetic recording medium by a magnetic transducer having a body of magnetically permeable material defining a transducer gear having a magnetic recording medium. for transferring information signals on a track along said magnetic recording medium followed by said magnetically movable segment of said conversion gear; moving the movable segment of the transducer gear along the transducer gear so as to follow the track along which the information signal is transferred; Method. (70) In the method set forth in claim 69, the trouble to be followed is sensing a deviation of the magnetically movable segment with respect to the transducer gear; The invention further comprises further moving the movable segment of the exchange gear. The above method as a sign. (71) so that the information signal traces a selected path along the recording medium as it is transferred; a method for transmitting information signals on a magnetic recording medium, such as by a transducer controlled to: (a) form a transducing zone for magnetically coupling said transducer and the recording medium; Conversion gear that can be controlled to have segments a magnetic core defined by a pair of core portions; (b) coupled to the magnetic transducer and in response to a control signal selected segments of the gear the top so that the above conversion area for magnetically coupling the recording medium can be formed; (c) saturation control means for magnetically saturating selected areas of the core portion; (d) means for generating the control signal between a generator for generating a signal and coupling the same to said saturation control means, said control signal varying in accordance with the deviation of said conversion zone from said selected path; and causing a corresponding movement of the activated selected segment along the defined conversion gear in a direction such that the conversion section follows the selected path upon coupling to the control means. The above method is characterized by: (72) The method according to claim 71, wherein a body of magnetic material bridges the conversion gear in a magnetic coupling relationship, and a body of magnetic material that is associated with the magnetic core and forms the conversion zone in the body. A control to magnetically saturate one area of the body. The method described above is characterized in that it further comprises a control means. (73) In the system according to claim 71, the saturation control means saturates a part of the body bridging the conversion gear and defines the conversion zone. It is specially designed to provide a controlled magnetic flux that maintains a portion of the recording body unsaturated and highly permeable. The above method is a sign. (74) The method according to any of claims 71-73, wherein the transducer comprises at least one torpedo defining the selected path in a magnetic recording medium. is controlled to play back previously recorded information signals along the The above changes are made from one track when reproducing the recorded information signal according to the recorded information signal. further comprising sensing means for providing an indication of a deviation in the position of the conversion zone, the generator configured to cause the conversion zone to move into the trouble in response to an indication of the deviation provided by the sensing means. said control according to the deviation indicated above so that it is moved to follow the track. The above method is characterized in that the control signal is changed.