JPH10143953A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a good reproduced picture without causing cross talk and a noise in a magnetic tape in which a bending track is recorded and formed by constituting a device so that a height of a rotation locus plane of a magnetic head can be adjusted. SOLUTION: This device has first and second tilt means, the first tilt means tilts a central axis of a magnetic head by an angle in which rotation locus planes of magnetic heads H1 , H2 are coincident for a recorded locus of a magnetic tape. The second tilt means makes a position regulation plane of the magnetic tape coincide with a reference periphery position of the magnetic tape in a state in which relative relation of positions between the a recorded locus of the magnetic tape and rotation locus planes of magnetic heads H1 , H2 is held. And preceding to the first tilt means, a bending track is compensated by varying heights of rotation locus planes in a start end side and a terminal of a winding range of the magnetic tape for a drum DA by compound operation of operation varied in the reverse direction each other and operation varied in the same direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating magnetic head, an upper and a lower drum having a sliding surface for a magnetic tape wound around a part of a peripheral surface, and a recording formed on the magnetic tape. First inclination driving means for inclining the center axis of the rotary magnetic head by a predetermined angle when the rotational trajectory plane of the rotary magnetic head coincides with the trace, and a recording mark formed on the magnetic tape A magnetic tape position regulating surface is provided so that the position regulation surface of the magnetic tape coincides with the reference edge position of the magnetic tape while maintaining a relative positional relationship between the magnetic tape and the rotation locus surface of the rotating magnetic head. In a magnetic recording / reproducing apparatus configured to include a second tilt driving unit for tilting a member, there are various causes for generating a non-linear recording trace during a reproducing operation other than a so-called self-recording / reproducing operation. Inside The recording operation is performed using a magnetic recording / reproducing apparatus having one or more structural defects which cause a non-linear recording mark (curved track) on a recorded magnetic tape. The present invention relates to a magnetic recording / reproducing apparatus capable of obtaining a good reproduced image without generating crosstalk or noise even when an operation is performed.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of the peripheral surface of a drum composed of an upper drum and a lower drum is run at a predetermined running speed, and recording and reproducing operations are performed using a rotating magnetic head. A typical example of the so-called helical scan type magnetic recording / reproducing apparatus is a video tape
Recorder (VTR) [or video cassette recorder
(VCR)]. And the VT
In using the R and VCR, in addition to normal reproduction (normal reproduction) in which recorded information is reproduced at the same magnetic tape traveling speed as during recording, the traveling speed and traveling direction of the magnetic tape during recording are defined as follows. Trick play in which a reproducing operation is performed by running (including stopping) a magnetic tape at different running speeds and running directions is also widely performed.

Incidentally, the pattern of the recording trace formed on the magnetic tape by the rotation locus of the rotary magnetic head of the helical scan type magnetic recording / reproducing apparatus described above includes (1) the diameter of the drum, the number of rotations of the rotary magnetic head, Because it changes depending on various conditions such as the rotation direction of the rotating magnetic head, the traveling speed of the magnetic tape, the traveling direction of the magnetic tape, the track angle, the head track width, and the recording area width of the magnetic tape, for example,
Operation modes of the magnetic recording / reproducing apparatus (normal reproduction mode,
When the conditions such as the running direction and running speed of the magnetic tape change due to the change of various trick play operation modes), the pattern of the rotation locus of the rotating magnetic head drawn on the magnetic tape by the rotating magnetic head may change. become,
Therefore, the pattern of the recording trace formed on the magnetic tape changes.

Further, the pattern of the recording trace formed on the magnetic tape according to the rotation trajectory of the rotary magnetic head of the helical scan type magnetic recording / reproducing apparatus has the following problems. The height adjustment of the guide roller described later is not good), the running magnetic tape is swinging up and down, the rotation locus of the rotating magnetic head is eccentric, the position regulating surface of the magnetic tape is If the linearity of the position regulating surface of the magnetic tape on a member (e.g., a lower drum or a lead ring described later) having a (lead surface) is poor, the magnetic tape is rotated. A phenomenon in which the recording trace drawn in correspondence with the rotation locus of the magnetic head is bent not linearly (this phenomenon is called “track bending” and is caused by the phenomenon described above. A curved recording trace is sometimes referred to as a "non-linear recording trace (curved track)". Therefore, the pattern of the recording trace formed on the magnetic tape is indicated by the non-linear recording trace. .

First, in the case of the above (1), that is, when the conditions such as the running direction and the running speed of the magnetic tape change, the pattern of the rotation locus of the rotary magnetic head drawn on the magnetic tape changes. The following is a description with an example. For example, a helical scan type magnetic recording / reproducing device (VCR) based on the VHS (registered trademark) system
When operating in the P mode, the rotating magnetic head attached to the upper drum having a diameter of 62 mm rotates at 1800 rpm, and the magnetic tape wound around a part of the outer circumference of the upper and lower drums is The recording / reproducing operation is performed as a state of being transported in the forward direction at a feed rate of 33.35 mm per second. In this state, the rotation locus of the rotating magnetic head drawn on the magnetic tape during traveling by the rotating magnetic head is based on the reference of the magnetic tape. An angle of 5 ° 58'9.9 ”to the edge.

For example, in the VHS (registered trademark) VCR, a rotary magnetic head mounted on a rotary drum having a diameter of 62 mm is rotated at 1800 revolutions per minute and wound around a part of the outer periphery of the drum. When the recording / reproducing operation (double speed reproduction in the forward direction) is performed with the magnetic tape being transported in the forward direction at a feed rate of 66.7 mm per second, the rotating magnetic head draws the magnetic tape during traveling. The rotation trajectory of the rotating magnetic head has an angle of 6 ° 2′19.2 ″ with respect to the reference edge of the magnetic tape.

Further, for example, in a VCR according to the VHS (registered trademark) system, a rotary magnetic head mounted on a rotary drum having a diameter of 62 mm is rotated at 1800 revolutions per minute and wound around a part of the outer periphery of the drum. When the recording / reproducing operation (double speed reproduction in the reverse direction) is performed with the magnetic tape being transported in the reverse direction at a feed rate of 66.7 mm per second, the rotating magnetic head draws the magnetic tape during traveling. The rotation locus of the rotating magnetic head is at an angle of 5 ° 54'6.2 ”with respect to the reference edge of the magnetic tape, and is mounted on a rotating drum having a diameter of 62 mm in the above-described VHS (registered trademark) VCR. The rotating magnetic head is rotated 1800 revolutions per minute, and the magnetic tape wound around a part of the outer periphery of the drum is stopped. Rotational locus of the rotary magnetic head depicted in-loop is, 5 ° 5 with respect to the reference edge of the magnetic tape
The angle is 6'7.4 ".

Therefore, during normal recording / reproducing (normal recording / reproducing), the rotating locus of the rotating magnetic head drawn on the magnetic tape by the rotating magnetic head and the rotating magnetic track drawn on the magnetic tape by the rotating magnetic head during trick play. The rotation locus of the head intersects. Therefore, the signal level of the frequency modulated wave signal of the reproduced signal reproduced at the time of trick play changes greatly every time the rotating magnetic head crosses the recording trace, and the frequency modulated wave of the reproduced signal in one vertical scanning period is changed. Looking at the signal envelope, large undulations occur during one vertical scanning period. Therefore, as a reproduced image at the time of trick play, only a reproduced image of poor quality having noise bars in the image can be obtained. . In particular, in a consumer digital VTR,
Since the data amount of the video signal is compressed and recorded by the high-efficiency encoding method, the rotating magnetic head performs the reproducing operation across the recording track of the magnetic tape, such as during fast forward playback or rewind playback. In this case, an image may not be reproduced at all depending on the arrangement state of the blocks of data arranged in a mosaic pattern.

Next, a magnetic recording / reproducing apparatus (adjustment) which has one or more of the various causes for generating the non-linear recording traces described above in (2) has a structural defect. The recording operation is performed using a defective magnetic recording / reproducing apparatus), whereby the recorded magnetic tape on which the non-linear recording trace (curved track) is recorded is formed by the recorded magnetic tape. When the reproducing operation is performed by the magnetic recording / reproducing apparatus used for producing the tape, that is, in the case of so-called self-recording / reproducing, the rotational trajectory of the rotating magnetic head at the time of the recording operation and at the time of the reproducing operation is corresponded. Since the patterns drawn on the magnetic tape are the same, the reproduced image does not become defective, crosstalk and noise do not occur, and no particular problem occurs.

However, the recorded magnetic tape on which the non-linear recording marks (curved tracks) are recorded by the recording operation performed using the poorly adjusted magnetic recording / reproducing apparatus as described above (2). (2) When reproduction is performed using a magnetic recording / reproducing apparatus (sometimes described as an adjusted magnetic recording / reproducing apparatus) that does not have a structural defect that causes the non-linear recording trace described above. There is a problem that the reproduced image is defective because the rotation trajectory of the rotary magnetic head in the magnetic recording / reproducing apparatus used for the reproducing operation does not track the non-linear recording trace recorded on the recorded magnetic tape. Noise, crosstalk, and noise. Therefore, the fact that the recording operation of the improperly adjusted magnetic recording / reproducing apparatus creates a recorded magnetic tape on which non-linear recording traces (curved tracks) are recorded and formed means that the recording / reproducing operation is performed according to the same recording / reproducing method. This is a major problem in terms of so-called compatible reproduction, which is required between magnetic recording / reproducing devices, but the above-described problem in compatible reproduction is particularly important when high-density recording is performed by a recording trace having a small recording trace width. It becomes a serious problem.

In order to solve the above-mentioned various problems in (1) and (2), so-called tracking means is used so that the rotation trace of the rotating magnetic head and the recording trace of the magnetic tape are made to coincide with each other. Can solve the problem. Then, a rotating magnetic head is mounted on an electro-mechanical conversion element conventionally used as an actuator in an open-loop control circuit or a closed-loop control circuit, and the rotating magnetic head is displaced by the electro-mechanical conversion element, thereby rotating the rotating magnetic head. Tracks can be traced to recording marks on a magnetic tape.
As disclosed in Japanese Patent Application Laid-Open No. 1-158633, the rotating drum on which the rotating magnetic head is mounted and the lower drum are integrally inclined so that the rotating magnetic head can track the recording trace of the magnetic tape. For example, JP-A-6-309
In order to limit the height in the width direction of the magnetic tape provided on the side where the magnetic tape enters the drum and on the side where the magnetic tape separates from the drum, as in the magnetic recording / reproducing apparatus disclosed in Japanese Patent No. 745. Various solutions have been proposed, such as changing the height of the guide roller so that the rotating magnetic head can track a non-linear recording mark (curved track) recorded on the magnetic tape. ing.

However, in the VTR in which the rotation locus of the rotary magnetic head is controlled by using the electromechanical conversion element used as the actuator as described above, an electric motor for controlling the rotation locus of the rotary magnetic head is used. -Since the mechanical conversion element must be provided in a narrow space inside the rotating drum, a small-sized electro-mechanical conversion element is required. It is difficult to apply a large displacement to the rotating magnetic head, and the structure is such that the state of the head touching the magnetic tape does not deteriorate even when the rotating magnetic head displaced by the electro-mechanical transducer is displaced. VT that performs good recording / reproducing operation using a small actuator exhibiting good operating characteristics And it is difficult to make a rotating magnetic head track a recording track with a small width on a magnetic recording medium on which high-density recording is performed. is there.

In the magnetic recording / reproducing apparatus in which the rotating drum and the lower drum are tilted integrally so that the rotating magnetic head can follow the recording trace of the magnetic tape, Japanese Utility Model Publication No. 63-34126 discloses the same. In the magnetic recording / reproducing apparatus disclosed in the above, since the guide portion of the reference edge of the magnetic tape only comes into contact with the reference edge of the magnetic tape in a state close to point contact, so to speak, When the reference edge position of the tape is greatly displaced and the magnetic tape is recorded at a low recording density, that is, when the recording mark width is large, normal reproduction is barely good. However, during trick play, the magnetic tape is running in a state where the reference edge of the magnetic tape is not correctly guided by the guide section, so fast forward In either case the playback returns Birth and winding, it can not be performed satisfactorily remove the noise bars becomes a problem.

Further, in the magnetic recording / reproducing apparatus in which the rotating drum and the lower drum are integrally inclined so that the rotating magnetic head can track the recording trace of the magnetic tape, the magnetic recording / reproducing apparatus is disclosed in JP-A-61-158633. In the magnetic recording / reproducing apparatus disclosed in Japanese Patent Application Laid-Open Publication No. H10-209, a member (guide section) capable of guiding a portion of a predetermined length at a reference edge of a magnetic tape formed separately from the lower drum is fixed to a fixing section of the apparatus. Therefore, the change in the position of the reference edge of the magnetic tape, which has occurred in the magnetic recording and reproducing apparatus disclosed in Japanese Utility Model Publication No. 63-34126, can be prevented from occurring at least at the time of normal reproduction operation. If the rotating drum on which the magnetic head is mounted and the lower drum are integrally tilted to perform a fast-forward playback operation or a rewind playback operation, The magnetic tape running while being in sliding contact with the sliding surfaces of the upper and lower drums having the contact surfaces is inclined together with the upper and lower drums while being in sliding contact with the sliding surfaces of the upper and lower drums. With the inclination of the upper and lower drums, the reference edge of the magnetic tape may be displaced away from a member (guide portion) for guiding the reference edge of the magnetic tape. When the rotating drum on which the magnetic head is mounted and the lower drum are integrally tilted in order to perform a fast-forward playback operation or a rewind playback operation, the inclination of the upper and lower drums is increased. There is a portion where the reference edge of the magnetic tape is not guided by the above-described member (guide portion) for guiding the reference edge of the magnetic tape, and the position of the reference edge of the magnetic tape in that portion fluctuates, causing noise bars. There be generated.

Japanese Patent Laid-Open No. 6-3097
In the magnetic recording / reproducing apparatus described in Japanese Patent Publication No. 45-45, a guide roller for limiting the height in the width direction of the magnetic tape provided on the side where the magnetic tape enters the drum and the side where the magnetic tape separates from the drum is provided. Is a tape loading function that pulls out the magnetic tape from the cassette and winds it around a part of the peripheral surface of the upper and lower drums, and stores the magnetic tape wound around a part of the peripheral surface of the upper and lower drums in the cassette Since it is a movable member that is also used as a part of a member for achieving a tape unloading function to be performed, a mechanism for individually and precisely changing the height of the guide roller includes: The problem is that the configuration becomes complicated.

Therefore, the present applicant company has
As a device free from the drawbacks of the conventional example described above, a rotary magnetic head, an upper and lower drum having a sliding contact surface with a magnetic tape wound around a part of a peripheral surface, and formed on a magnetic tape. First tilt drive means for tilting the central axis of the rotary magnetic head by a predetermined angle when the rotational trajectory plane of the rotary magnetic head coincides with the recording trace formed, and formed on the magnetic tape. The position of the magnetic tape is regulated so that the position regulation surface of the magnetic tape is aligned with the reference edge position of the magnetic tape while maintaining the relative positional relationship between the recording trace and the rotational locus surface of the rotating magnetic head. The magnetic recording / reproducing apparatus can be expressed as a magnetic recording / reproducing apparatus including a second tilt driving means for tilting a member having a surface (for example, a lower drum or a lead ring). Although a recording / reproducing apparatus has been proposed, in particular, an upper drum having a sliding contact surface with a magnetic tape wound around a part of the peripheral surface of the upper and lower drums, a rotating magnetic head, and a magnetic head in the upper drum With a magnetic tape sliding contact surface located on the extended surface of the tape sliding contact surface,
A lower drum provided coaxially with the upper drum, and the upper and lower drums at a predetermined angle when the rotational trajectory surface of the rotary magnetic head coincides with a recording trace formed on the magnetic tape. First tilt drive means for tilting the central axis of the rotating magnetic head and the upper and lower drums, and the outer peripheral surface of a small diameter portion formed below the lower drum. A guide member (lead ring) for regulating the running position of a magnetic tape, which is provided in a state of being close to the guide portion (position regulating surface) of a reference edge of the magnetic tape.
And a second tilt drive means for tilting the guide member for regulating the running position of the magnetic tape so that the position regulating surface of the magnetic tape coincides with the reference edge position of the magnetic tape. Has achieved good results through its implementation. In addition, the present applicant has proposed a magnetic recording / reproducing apparatus as disclosed in Japanese Patent Application Laid-Open No. 8-180530 as an apparatus having no disadvantages of the conventional example described above.

FIGS. 11 and 12 are diagrams showing the schematic structure of a magnetic recording / reproducing apparatus already proposed by the present applicant. FIG. 11 shows the upper drum Du and the upper drum Du.
A lower drum Dd (see FIG. 12) provided in pairs with a guide member Lr (hereinafter, referred to as a reference of the magnetic tape T) for restricting the position of the reference edge Te of the magnetic tape T. A VTR mechanism unit including a drum assembly DA including a guide member for regulating a running position of a magnetic tape that regulates the position of the edge Te, which may be described as a lead ring Lr); FIG. 1 is a perspective view showing a schematic configuration of an example of a traveling system, and FIG.
Reference numeral 2 denotes a configuration example of a mechanism for controlling the rotation trajectory drawn on the magnetic tape T by the rotary magnetic heads H1 and H2 so as to be at a predetermined angle with respect to the reference edge Te of the magnetic tape T. . In FIG. 11, reference numeral 1 denotes a supply reel table, 2 denotes a take-up reel table, and a cassette case 3 wound around a supply reel 4 and a take-up reel 19 provided in a cassette case 3 and storing a magnetic tape T therein. Is mounted on the VTR, the supply reel 4 in the cassette case 3 is connected to the supply reel base 1 provided on the machine base 20, and the take-up reel 19 in the cassette case 3 is provided on the machine base 20. It is connected to the take-up reel base 2.

When the magnetic tape T is pulled out of the cassette case 3 by the loading poles (vertical guide rollers) 9 and 14 provided in the parallel loading type loading mechanism, the magnetic tape T is put on the tension pole 5 and the guide. The upper drum Du, which is driven and rotated at a predetermined rotation speed via a pole 6, a full width erasing head 7, an impedance roller 8, a loading pole (vertical guide roller) 9, an inclined guide (slant pole) 10, etc., and a stationary state After being wound around a part of the peripheral surface of the lower drum Dd while the reference edge Te of the magnetic tape is being guided, the inclined guide (slant pole) 13 and the loading pole
(Vertical Guide Roller) 14, audio control head 15, guide pole 16, capstan 18, pinch roller 17 and the like. 22 in the figure
s is a supply pole base and 22t is a take-up pole base.

In a state where the rotary magnetic head provided on the upper drum Du is driven and rotated at a predetermined rotation speed,
Control information is given from the main control unit according to the running direction and running speed of the magnetic tape T set in the main control unit provided in the VTR in accordance with various operation modes. The tilt controller (not shown) is configured to control the center line 21 of the drum structure DA including the upper drum Du, the lower drum Dd (see FIG. 12), and the lead ring Lr in the drum structure DA.
Is tilted by a predetermined amount in the direction of arrow 21a (or 21b) in FIG. 12, and the lead ring Lr is also tilted by a predetermined amount in a predetermined direction under the control of the tilt control unit. Is done. Thereby, the pattern of the rotation trajectory drawn on the magnetic tape T by the rotation trajectory of the rotary magnetic head is made to match the recording trace of the magnetic tape, and the lead ring guides the movement trajectory of the reference edge Te of the magnetic tape. The part G (position regulation surface) is brought into a state where they match.

After the loading operation by the loading mechanism is performed as described above, the magnetic tape T traveling on the magnetic tape traveling path set between the supply reel 4 and the take-up reel 19 is moved to the tension pole 5 → It travels in a horizontal state on a traveling path in the section of guide pole 6 → full width erasing head 7 → impedance roller 8 → loading pole (vertical guide roller) 9, and then inclined guide
When the running direction of the magnetic tape T is changed by the (slant pole) 10, the magnetic tape T is driven and rotated at a predetermined rotational speed by the upper drum Du and the lower drum D.
It is wound around the guide portion G provided on the lead ring Lr over a range of a center angle slightly more than 180 degrees with respect to both of d and d.

As described above, the upper drum Du and the lower drum D
The magnetic tape T wound around a range of slightly more than 180 degrees at the center angle with respect to the d, after the running direction of the magnetic tape T is returned to the horizontal running direction again by the inclined guide (slant pole) 13, , Loading pole
(Vertical guide roller) 14 → audio control head 15 → guide pole 16 → wound on a take-up reel 19 while traveling on a magnetic tape traveling path in a section such as a capstan 18 and a pinch roller 17. The arrow a in FIG. 11 indicates the rotation direction of the upper drum Du, and the arrow b indicates the transport direction of the magnetic tape T in the forward direction.
It goes without saying that the transfer direction of the magnetic tape T in the reverse direction is the direction opposite to the direction of the arrow b in FIG. Although a drum motor for driving and rotating the upper drum Du at a predetermined number of rotations is omitted in FIGS. 11 and 12 for simplification of the drawings, the drum motor is, for example, 14 and 15, a motor having a structure in which a rotor is fixed to the upper drum Du may be used. When the drum motor having the above-described configuration is used, the upper drum Du is supported by a bearing so as to be rotatable with respect to the center axis of the drum structure DA.

Next, the operation of the mechanism for controlling the rotation trajectory drawn on the magnetic tape T by the rotary magnetic head so as to be at an arbitrary predetermined angle with respect to the reference edge Te of the magnetic tape T. FIG. 12 showing the principle will be described. In FIG. 12, DB is a drum base, and a drum structure DA including an upper drum Du, a lower drum Dd, and a lead ring Lr is supported by the drum base DB. The upper drum Du is rotatably supported with respect to the center axis of the drum structure DA by a bearing (not shown) attached to the center axis (49 in FIGS. 14 and 15) of the drum structure DA. The lower drum Dd is fixed to the center axis of the drum structure DA. The lead ring Lr functioning as a guide for the reference edge Te of the magnetic tape T is formed separately from the lower drum Dd, close to the outer peripheral portion below the lower drum Dd, and A knife edge 23 provided on the inner periphery is coaxially fitted with the lower projection of the lower drum Dd.

During the recording operation, the lower drum Dd has four rotation fulcrums whose bottom surface protrudes from the drum base DB (two of the four rotation fulcrums in the figure). Only the pivot points 25 and 26 are shown, and two pivot points (not shown) correspond to the pivot points 2 shown in the figure.
Each of them is provided on a line perpendicular to the plane of the drawing at positions 5 and 26, and is supported by reference numerals 35 and 36 in FIG. 13). Lr indicates only four rotation fulcrums (two of the four rotation fulcrums 27 and 28) projected from the lead ring Lr.
The two pivots not shown are provided one by one on a line perpendicular to the plane of the drawing at the positions of the pivots 27 and 28 shown in the figure, and are shown in FIG. Although indicated by reference numerals 37 and 38, the lower drum Dd
Is pressed against the bottom of the drum. Springs (springs 44, 45, springs 46, 4 in FIGS. 13 to 15) are provided between the lead ring Lr and the drum base DB and between the lower drum Dd and the drum base DB, respectively.
7) is attached, and the above-mentioned parts are connected to each other in a predetermined connection state. [For a specific configuration example, the mutual connection state of each part when a recording operation is performed is shown in FIG. Is exemplified in the above).

When fast-forward playback (FF) is performed in the same running direction as the running direction of the magnetic tape during the recording operation, the screw 29 is driven so as to push up the bottom surface of the lower drum Dd. 30 is driven in a direction away from the bottom surface of the lower drum Dd, and two of the four rotation fulcrums (the rotation fulcrum 25 shown in FIG. One rotation fulcrum provided on a line perpendicular to the plane of the drawing at the position of the rotation fulcrum 25 is in contact with the bottom surface of the lower drum Dd.
The upper drum Du is defined by using the above-mentioned two pivot points as pivot points.
The center axis of the lower drum Dd is rotated in the direction of the arrow 21a in FIG. 12 (and FIG. 15). FIG. 15 shows an example of how the components are connected to each other. In the figure, 49 is a central axis, and 21 is a center line].

In the case where fast reverse reproduction (REW) is performed in a running direction opposite to the running direction of the magnetic tape during the recording operation, the screw 30 is driven so as to push up the bottom surface of the lower drum Dd. At the same time, the screw 29 is driven in a direction away from the bottom surface of the lower drum Dd, and two of the four pivots protruding from the drum base DB (the pivots 26 and Rotating fulcrum 26 shown in the figure
13, one rotation fulcrum provided on a line perpendicular to the paper surface in FIG. 13) is in contact with the bottom surface of the lower drum Dd, and the two rotation fulcrums are used as the rotation fulcrum. The center axis of the upper drum Du and the lower drum Dd is indicated by an arrow 2 in FIG.
1b. Screw 2
The above-described driving operations for the units 9 and 30 are performed by the operation of a driving mechanism operating under the control of a tilt control unit (not shown). The driving mechanism is a motor 4 serving as a power source as shown in an exploded perspective view of FIG.
0, reduction mechanism 41 composed of a plurality of gears, position detector 4
2. It comprises a rotary encoder 43 and the like.

The running direction and the running speed of the magnetic tape T are controlled by the main control unit provided in the VTR in accordance with various operation modes. The tilt control unit to which the information is given moves the center axis of the drum structure DA including the upper drum Du, the lower drum Dd (see FIG. 12), and the lead ring Lr in the drum structure DA to the arrow 21a (or 21b) in FIG. The drive mechanism is controlled so that the screws 29 and 30 are advanced and retracted in such a manner as to incline by a predetermined amount in the direction of (2).
When fast-forward playback (FF) is performed in the same running direction as the running direction of the magnetic tape during the recording operation, two of the four rotating fulcrums projecting from the lead ring Lr are used. (The rotation fulcrum 27 and one rotation fulcrum provided on a line perpendicular to the paper surface at the position of the rotation fulcrum 27 shown in the drawing... 37 in FIG. 13) The center axis of the lead ring Lr is rotated by a predetermined amount in the direction of the arrow 21a in FIG. 12 (and FIG. 15) by contacting the bottom surface of the lower drum Dd and using the two rotation fulcrums as the rotation fulcrum. The two screws 31 and 32, which are screwed into the lead ring Lr and are provided in a state where the tips abut on the bottom surface of the lower drum Dd, respectively, are rotated in opposite directions so as to be in a specific state. For the configuration example, fast forward playback in the forward direction Mutual bonding state of each component in the case of rope is illustrated in Figure 15.

Further, when rewind reproduction (REW) is performed in the running direction opposite to the running direction of the magnetic tape during the recording operation, four rotating fulcrums projecting from the lead ring Lr. Of the two rotation fulcrums (the rotation fulcrum 28)
And one rotation fulcrum provided on a line perpendicular to the paper surface at the position of the rotation fulcrum 28 shown in FIG.
38) in contact with the bottom surface of the lower drum Dd.
The lead ring Lr is screwed into the lead ring Lr such that the center axis of the lead ring Lr is turned by a predetermined amount in the direction of arrow 21b in FIG. , Two screws 31 and 3 provided in a state where the tip portions abut against the bottom surface of the lower drum Dd, respectively.
2 are rotated in opposite directions.

The above-described driving operation for the screws 31 and 32 is also performed by the operation of the above-described driving mechanism operating under the control of the tilt control unit (not shown). In response to the direction and the traveling speed being set in the main control unit provided in the VTR in accordance with various operation modes, the inclination control unit to which the control information is given from the main control unit includes: The drive mechanism is controlled to incline the lead ring Lr in the direction of the arrow 21a (or 21b) in FIG. 12 by a predetermined amount, and the screws 31 and 32 are advanced and retracted. In the above description, in order to facilitate understanding of the operation, in order to facilitate the understanding of the operation, the tilting operation of the center axis of the drum assembly by the forward and backward operations of the screws 29 and 30 and the tilting operation of the central axis of the lead ring Lr by the forward and backward operations of the screws 31 and 32 are described. But,
The explanation was made as if they were performed independently. However, as shown in FIG. 15, the screws 29 to 32 are simultaneously driven and rotated by the common power transmission mechanism, and
0 and the screw 32 are simultaneously driven and rotated by a common power transmission mechanism.
A tilting operation of the center axis of the drum structure by the forward / backward movement of 0;
The tilting operation of the center axis of the lead ring Lr by the forward and backward movements of the screws 31 and 32 is performed simultaneously.

FIG. 14 shows a specific configuration of the magnetic recording / reproducing apparatus already proposed. FIG. 14 is a vertical sectional view in the direction of 90 ° -180 °, and FIG. It is a longitudinal cross-sectional view. The expression of angles such as the 90-180 direction, the 0-180 direction, etc.
The middle position of the area where the magnetic tape T is wound around the sliding surface of u, Dd is set to a direction of 90 degrees, and a straight line connecting the position of 90 degrees and the center line of the center axis of the upper and lower drums. And the direction of a straight line passing through the center line of the center axis of the upper and lower drums is assumed to be 0 ° -180 °, and
From the intermediate position of the area where the magnetic tape T is wound around the sliding contact surfaces of the lower drums Du and Dd, in the counterclockwise direction, 9
The angle is defined as 0 ° → 180 ° → 270 ° → 0 ° → 90 °.

FIG. 14 shows the state of the magnetic recording / reproducing apparatus at the time of recording operation. FIG. 15 shows the state of the magnetic recording / reproducing apparatus at the time of fast-forward reproduction, that is, the center line 21 of the drum assembly DA is shown in FIG. It shows a state where it is inclined in the direction of arrow 21a. In FIG. 13 showing a partial exploded perspective view, the illustration of the upper drum Du and the drum motor 50 is omitted. 14 and 15, 4
Reference numeral 9 denotes a center shaft fixed to the lower drum Dd, and bearings 51 and 52 are fitted into the center shaft 49. Also,
The upper drum Du is rotatably supported by the bearings 51 and 52 with respect to the central shaft 49 described above. H1,
H2 is a rotary magnetic head provided on the upper drum Du. The upper drum Du has a drum drive motor 5
The zero rotor 50r is fixed. The stator 50s of the drum drive motor 50 is fixed to the central shaft 49 described above. Reference numeral 48 denotes a rotary transformer mounted on the lower drum Dd, and reference numeral 53 denotes a rotary transformer mounted on the upper drum Du.

In the magnetic recording / reproducing apparatus proposed by the present applicant and described with reference to FIGS. 11 to 15, the rotation trace surface of the rotary magnetic head coincides with the recording trace formed on the magnetic tape. The first tilt driving means for tilting the central axes of the upper and lower drums and the rotary magnetic head by a predetermined angle when the state is reached, and the upper and lower drums are separate from each other, and Position of the magnetic tape provided with a regulating surface G at the position of the reference edge of the magnetic tape, which is disposed close to the outer peripheral surface of the small-diameter portion 39 (see FIGS. 13 to 15) formed below the lower drum. The upper and lower drums are controlled by a regulating guide member (lead ring) Lr and a second inclination driving means for inclining the position regulating guide member of the magnetic tape so as to match the reference edge position of the magnetic tape. Magnetic tape A lead ring Lr which is provided with a position regulating surface G of the reference edge of, in response to various operation modes,
By inclining them as required, the rotation trajectory of the rotary magnetic head coincides with the recording trace formed on the magnetic tape, and the position of the magnetic tape T is adjusted by the position regulating surface G of the lead ring Lr. Of the reference edge Te can be satisfactorily guided.

In the magnetic recording / reproducing apparatus described above with reference to FIGS. 11 to 15, the member driven by the second inclination driving means has a regulating surface G at the position of the reference edge of the magnetic tape. In the above example, the guide member (lead ring) Lr for regulating the position of the tape is used. However, in the magnetic recording / reproducing apparatus described above, the member driven by the first tilt driving means is provided with a rotating magnetic head. And the member driven by the second inclined drive means may be the lower drum Dd having the regulating surface G at the position of the reference edge of the magnetic tape, as described above. When the member driven by the second tilt driving means is the lower drum Dd, the lower drum Dd is, for example, 90 degrees-270 while being rotatably engaged with the center axis. 2 pieces arranged in degrees The straight line connecting the rotation fulcrum is being configured to be driven by the second inclined drive means as a pivot axis.

Now, referring to FIGS. 11 to 15, the magnetic recording / reproducing apparatus described above, that is, the case where the reproducing operation is performed at a traveling speed different from the traveling speed of the magnetic tape during the recording operation However, the magnetic recording / reproducing apparatus configured to include the first and second tilt driving units proposed so as to be able to reproduce the reproduced image in a state in which the noise bar does not occur, the magnetic tape during the recording operation. When the reproducing operation is performed in a state where the magnetic tape is running at the same running speed as the running speed, the above-described first and second tilt driving means are set to a non-operating state and the reproducing operation is performed. Will be. Now, in the magnetic recording / reproducing apparatus configured to include the above-described first and second tilt driving means, which has been adjusted to the state of the adjusted magnetic recording / reproducing apparatus, the already-recorded magnetic recording / reproducing apparatus If the magnetic tape was created by a recording operation using a misaligned magnetic recording / reproducing apparatus, the recorded traces recorded on the recorded magnetic tape may have non-linear recording traces (curved lines) as described above. Therefore, if the data is reproduced as it is, a crosstalk, track-crossing noise, or the like occurs, and a reproduced signal that can display a good reproduced image cannot be obtained.

The magnetic recording / reproducing apparatus having the above-mentioned first and second tilt driving means, which has been adjusted to the state of the adjusted magnetic recording / reproducing apparatus, is provided with a poorly adjusted magnetic recording / reproducing apparatus. When the recorded magnetic tape created by the recording operation of the apparatus is to be reproduced in a good condition, for example, as described in Japanese Patent Laid-Open No.
As disclosed in Japanese Unexamined Patent Publication No. 530, a rotation fulcrum provided on a straight line connecting an intermediate position in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums and the center axis of the drum, By rotating the upper and lower drums by a required angle by a rotation fulcrum provided on a straight line intersecting with the upper and lower drums, the rotation magnetic field at the start end side in the winding range of the magnetic tape around the peripheral surfaces of the upper and lower drums is reduced. An operation in which the height of the rotation locus surface of the head and the height of the rotation locus surface of the rotary magnetic head on the end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums are changed in opposite directions; The height of the rotation trajectory surface of the rotary magnetic head on the start end side in the winding range of the magnetic tape with respect to the circumferential surface of the lower drum, and the height of the magnetic tape winding range with respect to the circumferential surface of the upper and lower drums The height of the rotational trajectory surface of the rotary magnetic head at the end side is adjusted to the adjusted magnetic recording / reproducing apparatus in such a manner that a combined operation with an operation of changing in the same direction is performed. The running state of the magnetic tape in the magnetic recording / reproducing apparatus configured with the first and second inclined driving means proposed above is changed to the improperly adjusted magnetic recording / reproducing apparatus used for recording the recorded magnetic tape. It is conceivable that the reproducing operation is performed by changing the state so as to be substantially the same as the running state of the magnetic tape in the above.

[0035]

However, in the magnetic recording / reproducing apparatus which is provided with the above-mentioned first and second tilt driving means, as described above, the first and second tilt driving means are used. Since the operation of the driving means is configured to be started at the same time, the magnetic recording / reproducing apparatus configured to include the first and second inclined driving means proposed in the related art can operate the magnetic tape during recording operation. With the magnetic tape running at the same running speed as the running speed, the upper and lower drum peripheral surfaces are moved so that the recorded magnetic tape created by the recording operation of the improperly adjusted magnetic recording / reproducing device can be reproduced well. A rotation fulcrum provided on a straight line connecting the intermediate position in the winding range of the magnetic tape and the center axis of the drum, and a rotation fulcrum provided on a straight line intersecting the straight line,
By inclining the lower drum by a required angle, the height of the rotation trajectory surface of the rotary magnetic head at the starting end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums and the peripheral surfaces of the upper and lower drums An operation in which the height of the rotation trajectory surface of the rotary magnetic head on the end side in the winding range of the magnetic tape is changed in the opposite direction, and the rotation on the starting end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums. The height of the rotation track surface of the magnetic head,
The height of the rotation track surface of the rotary magnetic head on the end side of the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums is combined with an operation of changing the height in the same direction to perform a combined operation. In the case where the correction is to be performed, in the state where the magnetic tape is run at the same running speed as the running speed of the magnetic tape at the time of the recording operation, the existing proposal which should have been originally made inoperative does not operate. Since the first tilt driving means in the magnetic recording / reproducing apparatus having the first and second tilt driving means is set to the operating state and performs the reproducing operation,
The rotation locus of the rotating magnetic head intersects with the recording trace of the recorded magnetic tape, and a satisfactory reproducing operation is not performed.

[0036]

SUMMARY OF THE INVENTION The present invention comprises a rotating magnetic head, an upper and a lower drum having a sliding surface for a magnetic tape wound around a part of the peripheral surface, and a magnetic tape. First tilt drive means for tilting the central axis of the rotary magnetic head by a predetermined angle when the rotational trajectory plane of the rotary magnetic head coincides with the recording trace, and recording formed on the magnetic tape. Equipped with a magnetic tape position regulating surface so that the magnetic tape position regulating surface coincides with the reference edge position of the magnetic tape while maintaining the relative positional relationship between the trace and the rotational track surface of the rotating magnetic head. And second inclination driving means for inclining the member. The inclination driving by the second inclination driving means is performed prior to the inclination driving operation by the first inclination driving means. Driving Configured, and as is performed,
The height of the rotation trajectory surface of the rotary magnetic head on the starting end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums, and the rotating magnetic head on the end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums And the height of the rotating track surface of the rotating magnetic head at the start end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums; The height of the rotation trajectory surface of the rotating magnetic head on the end side in the winding range of the magnetic tape with respect to the peripheral surface of the drum,
A magnetic recording / reproducing apparatus provided with means for performing a combined operation with an operation changed in the same direction, and a magnetic tape wound around a part of the peripheral surface of the upper and lower drums And a rotary magnetic head, and a magnetic tape sliding contact surface located on an extended surface of the magnetic tape sliding contact surface of the upper drum, and coaxial with the upper drum. And the lower drum and the rotating magnetic head are arranged at a predetermined angle when the rotational trajectory plane of the rotating magnetic head coincides with the recording trace formed on the magnetic tape. A first tilt drive means for tilting the central axis of the lower drum, and the upper and lower drums are separately formed, and are brought close to the outer peripheral surface of the small diameter portion formed at the lower portion of the lower drum. Is located on top Relative position relationship between the guide member for regulating the running position of the magnetic tape, which has a position regulating surface for the reference edge of the magnetic tape in the portion, and the recording trace formed on the magnetic tape and the rotational trajectory surface of the rotating magnetic head And a second inclination driving means for inclining the guide member for regulating the running position of the magnetic tape so that the position regulating surface of the magnetic tape coincides with the reference edge position of the magnetic tape while the state is maintained. The tilt drive by the second tilt drive is performed prior to the tilt drive by the first tilt drive, and the tilt drive by the second tilt drive is performed on the peripheral surfaces of the upper and lower drums. The height of the rotation trajectory surface of the rotary magnetic head on the start end side in the winding range of the magnetic tape;
An operation in which the height of the rotation locus surface of the rotary magnetic head on the end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums is changed in opposite directions; The height of the rotation track surface of the rotary magnetic head on the start end side in the winding range and the height of the rotation track surface of the rotary magnetic head on the end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums are the same. There is provided a magnetic recording / reproducing apparatus characterized by comprising means for performing a composite operation with an operation changed in a direction.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific contents of a magnetic recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an essential part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 5 is an exploded perspective view of a part of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 1 described above, and FIGS. FIG. 2 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 2; FIG. 2 is a side sectional view in a 90-270 degree direction; FIGS. FIG. FIG. 8 is a side sectional view of a main part of another embodiment of the magnetic recording / reproducing apparatus according to the present invention in the direction of 90-180 degrees. FIG. 9 is an exploded perspective view, and FIG. 9 is a side sectional view for explaining the operation of the magnetic recording and reproducing apparatus of the present invention shown in FIG. It is sectional drawing. 5 and 10 showing partial exploded perspective views, the illustration of the upper drum Du and the drum motor 50 is omitted.

FIGS. 1 to 5 showing the configuration of an embodiment of the magnetic recording / reproducing apparatus of the present invention, and FIGS. 8 to 10 showing the configuration of another embodiment of the magnetic recording / reproducing apparatus of the present invention. , DB is a drum base, SB is a sub-base, Lr is a lead ring (a guide member for regulating the running position of a magnetic tape having a position regulating surface of a reference edge of a magnetic tape), DA is a drum structure, Dd is a lower drum, Du is an upper drum, and a drum structure DA including an upper drum Du and a lower drum Dd and a lead ring Lr are supported by the drum base DB and the sub-base SB. The upper drum Du is rotatably supported with respect to the center axis of the drum structure DA by a bearing mounted on the center shaft 49 of the drum structure DA.
Is fixed to the center axis of the drum structure DA. Further, the lead ring Lr functioning as a guide for the reference edge Te of the magnetic tape T is formed separately from the lower drum Dd, and comes close to the outer peripheral portion 39 below the lower drum Dd. Are coaxially fitted with the lower protruding portion of the lower drum Dd by a knife edge 23 provided on the inner periphery of the lower drum Dd.

First, in the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 to 5, a projection 70 and two rotation fulcrums 71, 72 protrude from the upper surface of the drum base DB. . The protrusion 70 is provided in a direction of 90 degrees on the upper surface of the drum base DB.
Numeral 1 is provided in the direction of 0 degree on the upper surface of the drum base DB.
In the direction of 180 degrees on the upper surface of the. When the magnetic recording / reproducing apparatus performs a recording operation, the drum base D
All of the projection 70 and the two pivots 71 and 72 provided on the upper surface of the sub-base SB are brought into contact with the bottom surface of the sub-base SB, and the magnetic recording / reproducing apparatus of the present invention. When reproducing a recorded magnetic tape recorded by a magnetic recording / reproducing apparatus having an improper adjustment, the drum base D
B, the sub-base SB is separated from the protrusion 70, and the two rotation fulcrums 71, 72 provided on the upper surface of the drum base DB are connected to the sub-base S.
B is brought into contact with the bottom surface.

The above-mentioned drum bass DB and sub bass SB
A hole 78 provided in a 90-degree direction in the drum base, the portion of the coupling pin 63 and the coupling pin 64 implanted in the sub-base SB projecting from the lower surface side of the sub-base SB; The holes 79 provided in the 270-degree direction are loosely fitted to each other to be joined. In addition, portions of the coupling pins 63 and 64 protruding from the upper surface side of the sub-base SB are holes 80 formed in the lead ring Lr in a 90-degree direction.
And a hole 81 provided in the direction of 270 degrees. Therefore, the aforementioned drum base D
The relative positional relationship between B, sub-base SB, and lead ring Lr is such that coupling pins 63, 64 implanted in sub-base SB are holes 78, 79 drilled in drum base DB. And the holes 80 and 81 formed in the lead ring Lr.

Two rotation fulcrums 61 and 62 are provided in the 90-degree direction on the sub-base SB, and two rotation fulcrums 59 and 60 are provided in the 270-degree direction on the sub-base SB. Is provided. The pivot 5
9 and 60 loosely fit through holes 82 and 83 formed in the 270 degree direction of the lead ring Lr,
The upper end portion of the lead ring 60 can be brought into contact with the bottom surface of the lower drum Dd, and the rotation fulcrums 61 and 62 are formed in a through hole (shown in the figure) formed in the lead ring Lr at a 90-degree direction. (Not shown), so that the upper ends of the pivot points 61 and 62 can contact the bottom surface of the lower drum Dd. When the magnetic recording / reproducing device performs a recording operation, all of the four rotation fulcrums 59 to 62 are brought into contact with the bottom surface of the lower drum Dd. When performing the variable speed reproduction operation, two rotation fulcrums 5 out of the four rotation fulcrums 59 to 62 are used.
9, 61 (or two rotation fulcrums 60, 62) abut on the bottom surface of the drum Dd and are used as rotation fulcrums.

That is, the lower drum D during the recording operation
d indicates that the bottom surface thereof is projected from the sub-base SB.
Are supported by the four rotation fulcrums 59 to 62, and four rotation fulcrums 27, 28, 3 projecting from the lead ring Lr are provided on the bottom surface of the lower drum Dd during the recording operation.
7, 38 are pressed. The respective parts such as the lower drum Dd, the lead ring Lr, the sub-base SB, and the drum base DB are connected to each other by the springs 44 to 47, 65, and 68 mounted between the respective parts. Is set to a predetermined connection state.

FIG. 1 is a cross-sectional view of the magnetic recording / reproducing apparatus of the present invention in the direction of 90 ° -180 ° in a state where a recording operation is being performed. A cross-sectional view in the direction of 90 ° to 180 ° in a state where a so-called self-recording / reproducing operation is performed at the same running speed as the running speed of the tape is also shown. FIG.
In the magnetic recording / reproducing apparatus of the present invention shown in FIG.
In order to provide a bending correction function not provided in the magnetic recording / reproducing apparatus already proposed with reference to FIG. 15, a sub-base SB is provided between the drum base DB and the lead ring Lr, and a drum is provided. Rotation fulcrums 71 and 72 are provided so that the sub-base SB can be rotated in the direction of 90 degrees to 270 degrees in the base DB. When the so-called self-recording / reproducing operation is being performed at the same traveling speed as the speed, the screw 67 provided for performing the bending correction operation is separated from the sub-base SB. In the magnetic recording / reproducing apparatus of the present invention, all of the projection 70 provided on the upper surface of the drum base DB and the two rotation fulcrums 71 and 72 correspond to the sub base S. When the magnetic recording / reproducing device shown in FIG. 14 performs a reproducing operation at the same traveling speed as the traveling speed of the magnetic tape at the time of recording operation. It becomes substantially the same as the state.

FIG. 2 shows that the magnetic recording / reproducing apparatus of the present invention reproduces a recorded magnetic tape recorded by a poorly adjusted magnetic recording / reproducing apparatus at the same traveling speed as that of the magnetic tape during the recording operation. 90 degrees-27 while performing
FIG. 2 is a cross-sectional view of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 2 in which the screw 67 is driven and rotated by a driving mechanism (not shown) so that the tip of the screw 67 has a 90-degree angle in the sub-base SB. The bottom of the sub-base SB is separated from the protrusion 70 protruding above the drum base DB by raising the position of the sub-base SB, and two sub-projections SB protruding in the 0-degree direction and the 180-degree direction in the drum base DB are raised. Fulcrum 7
Only the bases 1 and 72 abut on the bottom surface of the sub-base SB and function as pivots, and the sub-base SB pivots clockwise in FIG. 2 by the two pivots 71 and 72 described above. , The sub-base SB is shown in FIG.
It will be in a state of inclining to the state of rising to the left.

Due to the inclination of the sub-base SB, the four pivots 59 to 6 provided on the sub-base SB are provided.
The lower drum Dd which is in contact with the tip of No. 2 is also inclined. Further, since the upper drum Du is attached to the center shaft 49 fixed to the lower drum Dd via bearings 51 and 52, the above-described sub-base SB is protruded from the drum base DB. Of the sub-base SB in the 90-degree direction.
The portion is tilted to the left in FIG. Thereby, the drum structure DA including the upper drum Du and the lower drum Dd also has
The tilting operation in two directions required for the bending correction operation together with the tilting of the sub-base SB (the tilting operation in the 90-270 degree direction as illustrated in FIG. 2 and the tilting operation in FIG. 3) One of two directions (a tilt operation in two directions and a tilt operation in a certain 0-180 degree direction) (90-270)
(Degree direction), for example, a tilting operation as illustrated in FIG. 2 is performed.

FIG. 2 is a side sectional view of the magnetic recording / reproducing apparatus of the present invention illustrated in FIG. 2 in the direction of 90 ° -270 °, which shows a recorded magnetic field to be reproduced by the magnetic recording / reproducing apparatus of the present invention. The state of the maladjustment in the maladjusted magnetic recording / reproducing apparatus used for recording the tape is caused by the guide rollers 9 and 1 provided in the running path of the magnetic tape.
4 (see FIGS. 11 and 12), the regulation of the height direction of the running path of the magnetic tape, which should be performed by the guide rollers 9 and 14, is compared with the regular height position of the running path of the magnetic tape. In the magnetic recording / reproducing apparatus of the present invention, a bending correction operation suitable for reproducing a recorded magnetic tape recorded in a case where the magnetic tape has been adjusted to a state in which the magnetic tape is run by an equivalent amount higher is performed. This is for explaining the state of the inclination of the central axis 49 of the drum structure DA in the direction of 90 degrees to 270 degrees in the case of performing the operation.

FIG. 3 is a side sectional view of the magnetic recording / reproducing apparatus of the present invention illustrated in FIG.
The state of the improper adjustment in the improperly adjusted magnetic recording / reproducing apparatus used to record the recorded magnetic tape that is to be reproduced by the magnetic recording / reproducing apparatus of the present invention is provided in the running path of the magnetic tape. Guide rollers 9, 14
(See FIGS. 11 and 12) The restriction of the height direction of the running path of the magnetic tape to be performed by the guide roller 9 is lower than the regular height, and the height of the guide roller 14 is lower than the regular height. A bending correction operation suitable for reproducing a recorded magnetic tape recorded when the magnetic tape is adjusted to a state where the magnetic tape is run higher than the regular height, in the magnetic recording and reproducing apparatus of the present invention. This figure illustrates the state of the inclination of the central axis 49 of the drum structure DA in the 0 ° -180 ° direction when performing the operation.

The magnetic recording / reproducing apparatus of the present invention performs a bend correcting operation for a bent track generated on the basis of the above-described cause in the magnetic recording / reproducing apparatus having an improper adjustment, in the case of FIG. The tilt driving operation of the drum structure DA with respect to the central axis 49 in the degree direction is performed by controlling the screw 29 screwed to the sub-base SB under the control of a control unit (not shown) by a driving mechanism (not shown). (A power transmission mechanism using a motor and gears) to drive the bottom of the lower drum Dd in the 0-degree direction by the tip of the screw 29;
The screw 30 screwed to the sub-base SB is rotationally driven by a drive mechanism (power transmission mechanism using a drive motor and gears) not shown under the control of a control unit not shown, and This operation is performed by separating the tip of the screw 30 from the bottom surface of the lower drum Dd in the 180-degree direction. The central axis of the drum structure DA is shifted by 0 ° -180 ° by the angle required for the bending correction operation for the curved track by the tilt driving operation with respect to the central axis 49 of the drum structure DA in the 0 ° -180 ° direction. 3 is tilted in the direction of the arrow in FIG.

By the way, the center axis 49 of the drum structure DA of the magnetic recording / reproducing apparatus of the present invention is inclined as shown in FIG. Thus, the bendable track can be corrected by the magnetic recording / reproducing apparatus of the present invention. The state is, as described above, the guide rollers 9 provided on the running path of the magnetic tape,
When the height of the guide roller 9 at 14 is lower than the regular height and the height of the guide roller 14 is adjusted to run the magnetic tape at a higher level than the regular height, , A curved track recorded on a recorded magnetic tape.

Therefore, the state of the improper adjustment in the improperly adjusted magnetic recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus of the present invention is as follows. Conversely, the height of the guide rollers 9 in the guide rollers 9 and 14 provided in the running path of the magnetic tape is higher than the regular height, and the height of the guide rollers 14 is the regular height. When the magnetic tape is adjusted to run the magnetic tape in a lower state, the recorded magnetic tape recorded by the magnetic recording / reproducing apparatus having the poor adjustment is recorded by the magnetic recording / reproducing apparatus of the present invention. When performing a reproducing operation while performing a bending correction operation on a bent track of the tape, the screw 30 screwed to the sub base SB is controlled by a control unit (not shown). An operation of driving a rotary mechanism by a drive mechanism (a power transmission mechanism using a drive motor and a gear) (not shown) to push up the bottom surface of the lower drum Dd in the 180-degree direction by the tip end of the screw 30; The screw 29 screwed to the base SB is rotationally driven by a drive mechanism (not shown) (a power transmission mechanism using a drive motor and gears) under the control of a control unit (not shown). 29 is moved away from the bottom surface of the lower drum Dd in the 0-degree direction. Then, by the above-described tilt driving operation with respect to the center axis 49 of the drum structure DA in the 0-180 degree direction,
The center axis of the drum structure DA is inclined in the direction opposite to the arrow in FIG. 3 in the direction of 0 to 180 degrees by an angle required for the bending correction operation for the bent track.

The amount of inclination of the center axis of the drum structure DA in the direction of 0 to 180 degrees in the bending correction operation for the bending track is determined by the magnetic recording / reproducing apparatus described above with reference to FIGS. This is very small compared to the amount of inclination of the center axis of the drum structure DA in the 0 ° -180 ° direction when performing the operation. That is, a state in which the magnetic recording / reproducing apparatus of the present invention performs a reproducing operation on a recorded magnetic tape recorded by a magnetic recording / reproducing apparatus having an improper adjustment at the same traveling speed as that of the magnetic tape during the recording operation. , The inclination angle θ of the lower drum Dd relative to the drum base DB and the lead ring Lr
The relative angle change between the inclination angle θ2 and the inclination angle θ2 is in the state illustrated in FIG. The above state corresponds to the manner in which the screws 29 to 32 move forward and backward when the magnetic recording / reproducing apparatus described above with reference to FIGS. DB
6 is different from the inclination angle θ2 of the lead ring Lr with respect to the drum base DB, as shown in FIG.

As described above, the magnetic recording / reproducing apparatus of the present invention reproduces the recorded magnetic tape recorded by the poorly adjusted magnetic recording / reproducing apparatus at the same traveling speed as that of the magnetic tape during the recording operation. When the bending correction operation is being performed in the state in which the lower drum Dd is engaged with the lead ring Lr,
The lower drum Dd and the lead ring Lr perform the tilting operation in an integrated state. Therefore, the tilt angle of the lower drum Dd with respect to the drum base DB and the drum base The inclination angle of the lead ring Lr with respect to DB is the same angle θ as in each region indicated by Fa and Fb in FIG. A region Fc in FIG. 7 is a region (dead zone) where the above-mentioned inclination angle does not change.

The section of FF shown on the horizontal axis in FIGS. 6 and 7 is a section of high-speed reproduction (FF) in which the running direction of the magnetic tape is forward, and the section of REW is
High-speed playback (REW) with the running direction of the magnetic tape reversed.
The section F between the FF section and the REW section indicates a section in which the running speed of the magnetic tape during the reproducing operation is the same as the running speed during the recording operation.
In the section FF, the right side in the figure is said to have an increased double speed number, and in the section REW, the left side in the figure is to have an increased double speed number. .

As is apparent from the above description, the improper adjustment of the magnetic recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus of the present invention. The state shown in FIG. 1 corresponds to the guide rollers 9 and 14 (see FIG.
1, refer to FIG. 12).
In both cases, the recorded magnetic field recorded when the magnetic tape was adjusted to run in such a manner that the magnetic tape was run by an equal amount higher than the regular height position of the running path of the magnetic tape. The bending correction operation suitable for reproducing the tape is performed by tilting the central axis 49 of the drum structure DA in the clockwise direction in the direction of 90 degrees to 270 degrees as shown in FIG. The amount of inclination at the guides 9 and 14 is determined from the regular height described above.
Is determined on the basis of the amount of deviation in height.

In addition, the state of the improper adjustment in the improperly adjusted magnetic recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus of the present invention corresponds to the running of the magnetic tape. The restriction in the height direction of the running path of the magnetic tape to be performed by the guide rollers 9 and 14 provided in the road is such that the height of the guide roller 9 is lower (or higher) than the regular height. Also, when the height of the guide roller 14 is adjusted to a state where the magnetic tape is run higher (or lower) than the regular height, the bending suitable for reproducing the recorded magnetic tape recorded thereon is performed. The correction operation is performed by inclining the center axis 49 of the drum structure DA in the direction of 0 to 180 degrees, and the amount of inclination in the above-mentioned direction is determined from the above-mentioned regular height by the guides 9 and 1. It is determined based on the shift amount of height.

In the magnetic recording / reproducing apparatus of the present invention described above with reference to FIGS. 1 to 5, the improperly adjusted magnetic recording used for recording the recorded magnetic tape to be reproduced. The center axis 49 of the drum structure DA is set according to the state of the adjustment error in the playback device.
A predetermined amount is inclined in the clockwise direction in the direction of 90 degrees to 270 degrees, or the center axis 49 of the drum structure DA is shifted in the clockwise direction in the direction of 0 degrees to 180 degrees or the predetermined amount in the counterclockwise direction. Incline or set the center axis 49 of the drum structure DA to 90 degrees-270.
In the clockwise direction by a predetermined amount in the degree direction, and the center axis 49 of the drum structure DA is set to 0 degree-1.
By inclining by a predetermined amount in the clockwise direction or the counterclockwise direction in the 80-degree direction, the curved track in the state where the recorded magnetic tape runs at the same running speed as the running speed of the magnetic tape during the recording operation. The bending correction operation can be performed favorably.

Next, FIG. 4 shows that the magnetic recording / reproducing apparatus according to the present invention performs high-speed reproduction (F / F) in a region on the right side of the region Fa in FIG.
It is a figure which illustrates and illustrates the example of operation | movement in the case of operating in the area of F). In FIG. 4, the screws 30 and 32 are driven and rotated so as to be separated from the bottom surface of the lower drum Dd, and the screws 29 and 31 are driven and rotated so as to push up the bottom surface of the lower drum Dd. The state of the apparatus during fast-forward playback, that is, the center line of the drum structure DA is inclined in the direction of the arrow in the figure. The magnetic recording / reproducing apparatus of the present invention can perform the bending correction even during the high-speed reproducing operation as shown in FIG.
In addition, the high-speed reproduction operation can be performed in a noiseless state, similarly to the magnetic recording / reproducing device already proposed with reference to FIGS. Although not shown, the magnetic recording / reproducing apparatus of the present invention is used for high-speed reproduction (REW) in a region on the left side of the region Fb in FIG. Even when the operation is performed in the section, the high-speed reproduction operation is performed in a state in which the bending correction is performed, and in a noiseless state as in the case of the magnetic recording / reproducing apparatus already proposed with reference to FIGS. It goes without saying that it can be obtained.

Correspondingly, the drum base D of the lower drum Dd
The relative angle change between the inclination angle θ with respect to B and the inclination angle θ2 of the lead ring Lr with respect to the drum base DB is in the state illustrated in FIG.
This is the same as the case of the magnetic recording / reproducing apparatus described above with reference to FIG. That is, also in the magnetic recording / reproducing apparatus of the present invention, the rotating magnetic heads H1 and H2 provided on the upper drum Du are driven and rotated at a predetermined rotation speed.
According to the running direction and running speed of the magnetic tape T set in the main control unit (not shown) provided in the VTR in accordance with various rotation operation modes, The tilt control unit (not shown) to which the control information is given,
The center axis 4 of the drum structure DA including the upper drum Du, the lower drum Dd, and the lead ring Lr in the drum structure DA.
9 is indicated by the arrow 21a in FIG.
A control operation is performed such that the lead ring Lr is inclined by a predetermined amount in the direction of (or 21b), and the lead ring Lr is also inclined by a predetermined amount in a predetermined direction under the control of the inclination control unit.
Thus, the pattern of the rotation trajectory drawn on the magnetic tape T by the rotation trajectory of the rotary magnetic head is made to match the recording trace of the magnetic tape, and the guide portion of the lead ring is moved along the movement trajectory of the reference edge Te of the magnetic tape. High-speed reproduction is performed in a state where G (position regulation surface) is in agreement.

When fast-forward playback (FF) is performed in the same running direction as the magnetic tape during the recording operation, the screw 29 is driven so as to push up the bottom surface of the lower drum Dd. 30 is driven in a direction away from the bottom surface of the lower drum Dd, and two of the four rotation supports 59 and 62 projecting from the sub-base SB are moved to the lower drum Dd. In contact with the bottom of
The center shaft 49 of the upper drum Du and the lower drum Dd is rotated clockwise in the drawing with the rotation fulcrums 59 and 61 as pivots. In addition, lead ring L
r is screwed into the lead ring Lr so that the center axis of the r is rotated by a predetermined amount in the clockwise direction, and the leading end is provided so as to be in contact with the bottom surface of the lower drum Dd. The two screws 31 and 32 are rotated in opposite directions.

In the case where fast reverse reproduction (REW) is performed in the running direction opposite to the running direction of the magnetic tape during the recording operation, the screw 30 is driven so as to push up the bottom surface of the lower drum Dd. The screw 29 is driven in a direction away from the bottom surface of the lower drum Dd,
Two rotation fulcrums 60 and 62 out of the four rotation fulcrums 59 to 62 projecting from B contact the bottom surface of the lower drum Dd, and the two rotation fulcrums 60 and 62. , The center axis 49 of the upper drum Du and the lower drum Dd is rotated counterclockwise in the drawing. Also,
The lead ring Lr is set so that the center axis of the lead ring Lr is turned by a predetermined amount in the counterclockwise direction.
, And two screws 31, 32 provided with their leading ends abutting on the bottom surface of the lower drum Dd, respectively, are rotated in opposite directions.

The above-described driving operation on the screws 29 to 32 and the driving operation on the screw 67 are performed by the turning operation of a driving mechanism operated under the control of a tilt control unit (not shown). . The drive mechanism includes a motor 40 as a power source as shown in the exploded perspective view of FIG. 5, a speed reduction mechanism 41 including a plurality of gears, a position detector 42, a rotary encoder 43, and the like. Have been. In FIG. 5, a drive mechanism (a motor, a gear, or the like) for the screw 67 is not shown.

The magnetic recording / reproducing apparatus of the present invention described above with reference to FIGS.
A sub-base SB is provided between B and the lead ring Lr, and rotation fulcrums 71 and 72 are provided so that the sub-base SB can be rotated in the direction of 90-270 degrees in the drum base DB. When the magnetic recording / reproducing apparatus of the present invention reproduces a recorded magnetic tape recorded by a magnetic recording / reproducing apparatus having an improper adjustment at the same traveling speed as the traveling speed of the magnetic tape during the recording operation, the screw 67 is set. Driving and rotating by a driving mechanism (not shown), the tip of the screw 67 pushes up a position in the 90-degree direction on the sub base SB, and the bottom surface of the sub base SB is
B, two rotation fulcrums 71, 72 projecting in the 0-degree direction and the 180-degree direction in the drum base DB are brought into contact with the bottom surface of the sub-base SB. The sub-base S
B is rotated clockwise in FIG. 2 by the above-described two rotation fulcrums 71 and 72, and the sub-base SB is tilted to the upper left in FIG. 2 with respect to the drum base DB. In the magnetic recording / reproducing apparatus of the present invention, the state of the maladjustment in the improperly adjusted magnetic recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus is caused during the traveling path of the magnetic tape. The regulation of the height direction of the running path of the magnetic tape to be performed by the provided guide rollers 9 and 14 (see FIGS. 11 and 12) is performed for both the guide rollers 9 and 14 described above. Bending correction suitable for playing back recorded magnetic tape when the magnetic tape is adjusted to run the magnetic tape by an equal amount compared to the regular height position of It was related embodiment of the magnetic recording and reproducing apparatus is configured to include a configuration such that it can perform work.

However, the state of the improper adjustment in the improperly adjusted magnetic recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus of the present invention is as described above. The regulation of the height direction of the running path of the magnetic tape to be performed by the guide rollers 9 and 14 (see FIGS. 11 and 12) provided in the running path of the magnetic tape depends on both the guide rollers 9 and 14 described above. As for the case where the magnetic tape is adjusted to run in such a way that the magnetic tape is elevated by an equal amount compared to the regular height position of the magnetic tape traveling path, the majority of the adjustment errors are occupied. Survey results (JP-A-8-180
530), there are other failure modes other than the above-described failure modes, and therefore, as described above with reference to FIGS. 1 to 5 described above. It may be considered that the magnetic recording / reproducing device of the configuration has an insufficient bending correction capability.

In the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10, as described above, two rotation fulcrums 73 and 75 are provided in the 0-degree direction on the drum base DB, and the drum base DB is provided. The two rotation fulcrums 74 and 76 are provided in the 180-degree direction above, and the four rotation fulcrums 7 described above are provided.
From among 3 to 76, two rotation fulcrums are selected, and the selected two rotation fulcrums (for example, two rotation fulcrums of a rotation fulcrum 73 and a rotation fulcrum 74, or for example, Rotating fulcrum 7
5 and two pivots, or for example, two pivots 73 and 76,
Or, for example, using two rotation fulcrums of a rotation fulcrum 75 and a rotation fulcrum 74, a screw 67 acting on a 90-degree direction part of the sub-base SB, and a 270-degree direction of the sub-base SB By controlling the selection of the screw 77 acting on the portion and the amount of advance and retreat of the screw 67, 77, the magnetic recording / reproducing apparatus is used to record a recorded magnetic tape to be reproduced. Regardless of the mode of the poorly adjusted magnetic recording / reproducing apparatus, the bending correction can be performed satisfactorily.

In the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10, four rotating fulcrums 73 to 76 are protruded from the upper surface of the drum base DB. Two rotation fulcrums 7 among the four rotation fulcrums 73 to 76
Reference numerals 3 and 75 are provided in the direction of 0 degrees on the upper surface of the drum base DB.
Two rotation fulcrums 74 and 76 out of 76 are provided in the direction of 180 degrees on the upper surface of the drum base DB.
When the magnetic recording / reproducing apparatus performs a recording operation, all of the four rotation fulcrums 73 to 76 provided on the upper surface of the drum base DB correspond to the lower surface of the sub base SB. When the magnetic recording / reproducing apparatus of the present invention reproduces a recorded magnetic tape recorded by a poorly adjusted magnetic recording / reproducing apparatus, the magnetic recording / reproducing apparatus of the present invention is provided on the upper surface of the drum base DB. Rotating fulcrum 73
-76 are selected as sub-base SBs
And is used as a rotation fulcrum.

The above-mentioned drum bass DB and sub bass S
B is a connecting pin 63 implanted in the sub-base SB.
The portions of the drum base and the coupling pins 64 protruding from the lower surface side of the sub base SB are respectively provided in a hole 78 provided in a 90-degree direction and a hole 79 provided in a 270-degree direction in the drum base. They are joined by loose fitting. The portions of the coupling pins 63 and 64 protruding from the upper surface side of the sub-base SB are holes 8 provided in the lead ring Lr at 90 degrees.
0 and the holes 81 provided in the directions of 270 degrees are loosely fitted respectively. Accordingly, the relative positional relationship between the drum base DB, the sub-base SB, and the lead ring Lr is such that the coupling pins 63 and 64 implanted in the sub-base SB are formed in the drum base DB. The holes 78 and 79 are loosely fitted into the holes 80 and 81 formed in the lead ring Lr, respectively.

Two turning fulcrums 61 and 62 are provided in the 90-degree direction on the sub-base SB.
Further, two rotation fulcrums 59 and 60 are provided in the direction of 270 degrees in the sub-base SB. The pivots 59 and 60 loosely fit through holes 82 and 83 formed in the lead ring Lr in the direction of 270 degrees, and
The upper end portions of the lower drum 9 and the lower drum Dd can be brought into contact with the bottom surface of the lower drum Dd.
The through holes (not shown) formed in the lead ring Lr in the 90-degree direction are loosely fitted, and the pivot points 61 and 62 are rotated.
The upper end of the lower drum Dd can be brought into contact with the bottom surface of the lower drum Dd. When the magnetic recording / reproducing apparatus performs a recording operation, all of the four rotation fulcrums 59 to 62 are brought into contact with the bottom surface of the lower drum Dd. When performing the variable speed reproduction operation, two rotation fulcrums 59 and 61 (or two rotation fulcrums 60 and 6) of the four rotation fulcrums 59 to 62 are used.
2) contacts the bottom surface of the drum Dd and is used as a pivot point.

That is, the lower drum D during the recording operation
d indicates that the bottom surface thereof is projected from the sub-base SB.
Are supported by the four rotation fulcrums 59 to 62, and four rotation fulcrums 27, 28, 3 projecting from the lead ring Lr are provided on the bottom surface of the lower drum Dd during the recording operation.
7, 38 are pressed. The respective parts such as the lower drum Dd, the lead ring Lr, the sub-base SB, and the drum base DB are connected to each other by the springs 44 to 47, 65, and 68 mounted between the respective parts. Is set to a predetermined connection state.

The magnetic recording / reproducing apparatus of the present invention described with reference to FIGS. 8 to 10 performs a so-called self-recording / reproducing operation at the same traveling speed as that of the magnetic tape during the recording operation. In this state, the screws 67 and 77 (FIG. 10) provided for performing the bending correction operation are separated from the sub-base SB. All of the four pivots 73 to 76 provided on the upper surface of the base DB are in contact with the bottom surface of the sub-base SB, and the magnetic recording / reproducing of the present invention shown in FIG. The operation state is substantially the same as when the apparatus and the already-proposed magnetic recording / reproducing apparatus shown in FIG. 14 perform the reproducing operation at the same traveling speed as the traveling speed of the magnetic tape during the recording operation. .

FIG. 9 shows that the magnetic recording / reproducing apparatus of the present invention reproduces a recorded magnetic tape recorded by a poorly adjusted magnetic recording / reproducing apparatus at the same traveling speed as that of the magnetic tape during the recording operation. 90 degrees-27 while performing
FIG. 9 is a cross-sectional view in the 0-degree direction. The magnetic recording / reproducing apparatus of the present invention shown in FIG.
7, 77 (however, the screw 77 shown in FIG. 10)
9 is not shown in FIG. 9), and the tip of the screw 67 is used to rotate 9 in the sub-base SB.
A cross-sectional view in a state where the position near the 0-degree direction is pushed up and the screw 77 is retracted from the bottom surface of the sub-base SB is shown.

As described above, when the position near the 90-degree direction on the sub-base SB is pushed up by the tip of the screw 67, the 0-degree direction on the drum base DB becomes 180 degrees.
A total of four rotation fulcrums 73 to 76 protruding in the degree direction
Only two rotation fulcrums 75 and 76 of FIG. 10 are in contact with the bottom surface of the sub-base SB to function as rotation fulcrums,
The sub-base SB is rotated clockwise in FIG. 9 by the two pivots 75 and 76 described above, whereby the sub-base SB is raised leftward in FIG. 9 with respect to the drum base DB. It will be in an inclined state.

Due to the inclination of the sub-base SB, the four pivots 59 to 6 provided on the sub-base SB are provided.
The lower drum Dd which is in contact with the tip of No. 2 is also inclined. Further, since the upper drum Du is attached to the center shaft 49 fixed to the lower drum Dd via bearings 51 and 52, the above-described sub-base SB is protruded from the drum base DB. Are rotated by the two rotation fulcrums 75 and 76 of FIG.
The portion is inclined leftward in FIG. 9 with respect to the drum base DB from the portion in the 70-degree direction. Thereby, the drum structure DA including the upper drum Du and the lower drum Dd also has
The tilting operation in two directions required for the bending correction operation together with the tilting of the sub-base SB (the tilting operation in the direction near the 90-270 degree direction as illustrated in FIG. One of the directions (a direction near the 90-270 degree direction) of the two directions of the tilt operation in the 0-degree and 180-degree directions as illustrated in FIG. A tilting operation as illustrated in the figure will be performed.

As described above, the sub-base SB is rotated by the two rotation fulcrums 75 and 76 projecting from the drum base DB so that the 90-degree portion of the sub-base SB is rotated. The bending correction operation performed as a state in which the drum base DB is tilted to the upper left in FIG. 9 from the portion in the 270-degree direction is performed by the guide rollers 9 and 14 provided in the traveling path of the magnetic tape.
(Refer to FIG. 11 and FIG. 12) The restriction in the height direction of the running path of the magnetic tape to be performed by both the guide rollers 9 and 14 is compared with the regular height position of the running path of the magnetic tape. This is a bending correction operation suitable for reproducing a recorded magnetic tape recorded in a case where the magnetic tape has been adjusted to run in a state where the magnetic tape is elevated by an equal amount.

In the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10, the screws 67, 77 (however, the screw 77 shown in FIG. 9 (not shown in FIG. 9), the tip of the screw 77 pushes up a position near the 270 degree direction in the sub-base SB, and the screw 67 is retracted from the bottom surface of the sub-base SB. In this case, the tip of the screw 77 pushes up a position near the 270-degree direction in the sub-base SB, so that a total of four turns projecting in the 0-degree direction and the 180-degree direction in the drum base DB. Only two rotation fulcrums 73 and 74 of the fulcrum 73 to 76 (FIG. 10) are used for the sub-base SB.
Abuts on the bottom surface of the sub base S to function as a pivot point.
B is rotated in the counterclockwise direction in FIG. 9 by the two rotation fulcrums 73 and 74 described above, whereby the sub-base SB is tilted to the upper right in FIG. 9 with respect to the drum base DB. It will be in a state of having done.

Due to the inclination of the sub-base SB, the four pivots 59 to 6 provided on the sub-base SB are provided.
The lower drum Dd abutting on the tip of No. 2 is also inclined, and
Since the upper drum Du is attached to the center shaft 49 fixed to the lower drum Dd via bearings 51 and 52, the above-described sub-base SB is projected from the drum base DB. The sub-base SB is rotated by the rotation fulcrums 73 and 74, and the portion in the
The inclination in the right direction in FIG. 9 with respect to the drum base DB is more inclined than the part in the degree direction. Thereby,
Drum structure DA composed of upper drum Du and lower drum Dd
In addition, together with the tilting of the sub-base SB, the tilting operation in one direction (direction near the 90-270 degree direction) of the tilting operations in two directions required for the bending correction operation is performed. .

As described above, the sub-base SB is rotated by the two rotation fulcrums 73 and 74 projecting from the drum base DB, so that the portion of the sub-base SB in the 270-degree direction is rotated. The bending correction operation performed with the drum base DB tilted to the right in FIG. 9 rather than the 90-degree direction portion is performed by the guide rollers 9 and 14 provided in the traveling path of the magnetic tape.
(Refer to FIG. 11 and FIG. 12) The restriction in the height direction of the running path of the magnetic tape to be performed by both the guide rollers 9 and 14 is compared with the regular height position of the running path of the magnetic tape. This is a bending correction operation suitable for reproducing a recorded magnetic tape recorded when the magnetic tape is adjusted to run the magnetic tape in a state where the magnetic tape is lowered by an equal amount.

Also in the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10, in order to perform a bending correction operation on a bending track generated based on various causes, the magnetic recording / reproducing apparatus in the 0 ° -180 ° direction is used. Drum structure DA
The tilting operation with respect to the central axis 49 is performed. The screw 29 screwed to the sub-base SB is driven by a driving mechanism (not shown) under control of a control unit (not shown). The lower end of the lower drum Dd pushes up the bottom surface of the lower drum Dd in the 0-degree direction by the rotational drive by the power transmission mechanism using gears, and the drum is rotated by an angle required for the bending correction operation for the bending track. The center axis of the structure DA is 0 degrees-180
It is performed so as to be inclined in the degree direction.

That is, adjustment in a poorly adjusted magnetic recording / reproducing apparatus used for recording a recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus of the present invention shown in FIGS. In the defective state, the height of the guide rollers 9 in the guide rollers 9 and 14 provided in the traveling path of the magnetic tape is lower than the regular height,
If the height of the guide roller 14 has been adjusted so that the magnetic tape is run higher than the regular height, the misaligned magnetic recording which is a curved track recorded on the recorded magnetic tape is performed. The bend correcting operation for the bend track generated on the basis of the above-described cause in the reproducing apparatus is performed by the tilt drive operation with respect to the center axis 49 of the drum structure DA in the direction of 0 to 180 degrees.

The bending correction operation is performed by controlling the screw 29 screwed to the sub-base SB under the control of a control unit (not shown) by a drive mechanism (not shown) using a drive motor and a gear. (A power transmission mechanism) to drive up the bottom surface of the lower drum Dd in the 0-degree direction by the tip of the screw 29;
The screw 30 screwed into the screw 30 is driven to rotate by a drive mechanism (not shown) (a power transmission mechanism using a driving motor and gears) under the control of a control unit (not shown). The leading end is separated from the bottom surface of the lower drum Dd in the direction of 180 degrees by the operation of tilting the center axis 49 of the drum structure DA in the direction of 0-180 degrees, thereby bending the curved track. The central axis of the drum structure DA is inclined clockwise in the direction of 0 to 180 degrees by an angle required for the correction operation.

An incorrectly adjusted magnetic recording / reproducing apparatus used to record a recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10 Is opposite to the above case, the height of the guide rollers 9 in the guide rollers 9 and 14 provided in the running path of the magnetic tape is higher than the regular height, and If the height has been adjusted to run the magnetic tape in a state that is lower than the regular height, the recorded magnetic tape recorded by the magnetic recording / reproducing device having the adjustment failure is the present invention. In the case where the magnetic recording / reproducing apparatus performs the reproducing operation while performing the bending correction operation on the curved track of the recorded magnetic tape, the screw 30 screwed to the sub base SB is illustrated. Under the control of the control unit, the drive unit (not shown) is driven to rotate by a drive mechanism (a power transmission mechanism using a drive motor and a gear), and the bottom of the lower drum Dd in the 180-degree direction is driven by the tip of the screw 30. Pushing up operation and the screw 29 screwed to the sub-base SB
Under the control of a control unit (not shown), is driven to rotate by a drive mechanism (a power transmission mechanism using a drive motor and a gear) (not shown), and the tip of the screw 29 is
The lower drum Dd is separated from the bottom surface in the 0-degree direction. And, 0 degrees-18 mentioned above
By the tilt driving operation with respect to the center axis 49 of the drum structure DA in the 0-degree direction, the center axis of the drum structure DA is rotated counterclockwise in the direction of 0-180 degrees by the angle required for the bending correction operation for the bent track. It is inclined to.

The amount of inclination of the center axis of the drum structure DA in the 0 ° -180 ° direction in the bending correction operation for the bent track is determined by the center axis of the drum structure DA when the magnetic recording / reproducing apparatus performs the variable speed reproduction operation. 0 degrees-1
This is very small compared to the amount of tilt in the 80-degree direction. That is, a state in which the magnetic recording / reproducing apparatus of the present invention performs a reproducing operation on a recorded magnetic tape recorded by a magnetic recording / reproducing apparatus having an improper adjustment at the same traveling speed as that of the magnetic tape during the recording operation. In the screw 29
FIG. 7 illustrates a relative angle change between the inclination angle θ of the lower drum Dd with respect to the drum base DB and the inclination angle θ2 of the lead ring Lr with respect to the drum base DB, corresponding to the forward / backward movements of ~ 32. This state is the same as the case of the magnetic recording / reproducing apparatus described above with reference to FIGS.

As described above, the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10 uses the magnetic recording / reproducing apparatus having an improperly adjusted magnetic recording / reproducing apparatus to reduce the running speed of the magnetic tape during the recording operation. Even when the bending correction operation is being performed while the reproducing operation is being performed at the same traveling speed, the tip of the screw 31 screwed to the lead ring Lr is in contact with the bottom surface of the lower drum Dd. The lower drum Dd and the lead ring Lr perform the tilting operation in an integrated state because of the absence of the lower drum Dd, and therefore, the tilt angle of the lower drum Dd with respect to the drum base DB and the tilt angle of the lead ring Lr with respect to the drum base DB. The inclination angle is the same angle θ as in each area indicated by Fa and Fb in FIG. A region Fc in FIG. 7 is a region (dead zone) where the above-mentioned inclination angle does not change.

As is clear from the above description, FIG.
In the magnetic recording / reproducing apparatus of the present invention shown in FIG. 10 to FIG. 10, the state of the poorly adjusted magnetic recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced is the running of the magnetic tape. The regulation of the height direction of the running path of the magnetic tape to be performed by the guide rollers 9 and 14 (see FIGS. 11 and 12) provided in the path is performed by the magnetic tape for both the guide rollers 9 and 14 described above. Bending correction suitable for playback of recorded magnetic tape when the magnetic tape has been adjusted to run the magnetic tape by an equal amount higher than the normal height position of the running path of the recorded magnetic tape The operation is performed by inclining the central axis 49 of the drum structure DA in a clockwise direction in a 90-270 degree direction shown as a horizontal direction in FIG. , It tilts in the direction of the is determined on the basis of the shift amount of the height of the guide 9, 14 from the height of the above-described normal.

In addition, in the case of the improperly adjusted magnetic recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus of the present invention shown in FIGS. The state is determined by the guide rollers 9 and 14 (FIGS. 11 and 1) provided in the running path of the magnetic tape.
2), the regulation of the height direction of the running path of the magnetic tape must be performed for both the guide rollers 9 and 14 as compared with the regular height position of the running path of the magnetic tape. When the magnetic tape is adjusted to run in a state in which the magnetic tape is moved by a small amount, the bending correction operation suitable for reproducing the recorded magnetic tape is performed by adjusting the center axis 49 of the drum structure DA to the left and right in FIG. It is performed by tilting in the counterclockwise direction in the direction of 90 degrees to 270 degrees, which is shown as the direction, and the amount of tilt in the above direction is calculated from the above-mentioned regular height to the height of the guides 9 and 14. It is determined based on the shift amount.

Further, in the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10, the defective recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced is used. The state in which the height of the guide path of the magnetic tape is regulated by the guide rollers 9 and 14 provided in the path of travel of the magnetic tape depends on the height of the guide roller 9 described above. Recorded when the magnetic tape is adjusted to run lower (or higher) and the height of the guide roller 14 is higher (or lower) than the regular height. The bending correction operation suitable for reproducing the magnetic tape is performed by moving the center axis 49 of the drum assembly DA in the direction of 0 to 180 degrees.
Is inclined, and the amount of inclination in the above-mentioned direction is determined based on the amount of deviation of the height of the guides 9 and 14 from the above-mentioned regular height.

Thus, in the magnetic recording / reproducing apparatus of the present invention described above with reference to FIGS. 8 to 10, the magnetic recording of the improperly adjusted magnetic recording used for recording the recorded magnetic tape to be reproduced. The center axis 49 of the drum structure DA depends on the state of the adjustment error in the reproducing apparatus.
Is shown as the left-right direction in FIG.
Incline clockwise in the 0 degree direction or a predetermined amount in the counterclockwise direction, or use the drum structure D
The central axis 49 of A is inclined clockwise in the 0-180 direction or a predetermined amount in the counterclockwise direction, or the central axis 49 of the drum structure DA is shown as a horizontal direction in FIG. 9 in a clockwise direction in the 90 ° -270 ° direction, or a predetermined amount in a counterclockwise direction in the 90 ° -270 ° direction shown as the horizontal direction in FIG. By inclining the central axis 49 by a predetermined amount in the clockwise direction or the counterclockwise direction in the 0 ° -180 ° direction, the recorded magnetic tape can be read at the same running speed as the running speed of the magnetic tape during the recording operation. The bend correcting operation of the bend track in a running state can be performed favorably.

An example of the operation of the magnetic recording and reproducing apparatus of the present invention shown in FIGS. 8 to 10 in the section of high-speed reproduction (FF) in which the running direction of the magnetic tape is the forward direction is shown in FIG. The operation at that time is performed in such a manner that the screws 30 and 32 are driven and rotated so as to be separated from the bottom surface of the lower drum Dd, and the screws 29 and 31 are moved to the lower drum Dd. Of the magnetic recording / reproducing apparatus is brought into a state at the time of fast-forward reproduction. Since the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10 can perform the high-speed reproduction operation in a noiseless state even when the bending correction is performed even during the high-speed reproduction operation. is there. Also,
The magnetic recording / reproducing apparatus according to the present invention is applied to the area Fb in FIG.
Even when the magnetic tape is operated in the area on the left side, that is, in the section of high-speed reproduction (REW) in which the running direction of the magnetic tape is in the reverse direction, the high-speed reproduction operation is performed in a noiseless state with the bending correction performed. It goes without saying that it can be obtained.

That is, also in the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 8 to 10, the rotating magnetic heads H1 and H2 provided on the upper drum Du are driven and rotated at a predetermined rotation speed. In the state, the running direction and running speed of the magnetic tape T are set to V in accordance with various rotation operation modes.
In response to the setting of the main control unit (not shown) provided in the TR, the inclination control unit (not shown) to which the control information is given from the main control unit is used for the upper part of the drum structure DA. The center line (21) of the center axis 49 of the drum structure DA including the drum Du, the lower drum Dd, and the lead ring Lr is
A control operation for inclining by a predetermined amount in the direction of the arrow 21a (or 21b) in FIG. 12 described above is performed, and the lead ring Lr is also moved by a predetermined amount in a predetermined direction under the control of the inclination control unit. Inclined. Thus, the pattern of the rotation trajectory drawn on the magnetic tape T by the rotation trajectory of the rotary magnetic head is made to match the recording trace of the magnetic tape, and the guide portion of the lead ring is moved along the movement trajectory of the reference edge Te of the magnetic tape. High-speed reproduction is performed in a state where G (position regulation surface) is in agreement.

When fast-forward playback (FF) is performed in the same running direction as that of the magnetic tape during the recording operation, the screw 29 is driven so as to push up the bottom surface of the lower drum Dd, and 30 is driven in a direction away from the bottom surface of the lower drum Dd, and two of the four rotation supports 59 and 62 projecting from the sub-base SB are moved to the lower drum Dd. In contact with the bottom of
With the pivot points 59 and 61 as pivot points, the center axis 49 of the upper drum Du and the lower drum Dd is rotated clockwise in the direction of 0-180 degrees. Also,
The lead ring Lr is screwed into the lead ring Lr so that the center axis of the lead ring Lr is rotated by a predetermined amount in the clockwise direction, and the leading end of the lead ring Lr contacts the bottom surface of the lower drum Dd. The two provided screws 31, 32 are rotated in opposite directions.

In the case where the fast reverse reproduction (REW) is performed in the running direction opposite to the running direction of the magnetic tape during the recording operation, the screw 30 is driven so as to push up the bottom surface of the lower drum Dd. The screw 29 is driven in a direction away from the bottom surface of the lower drum Dd,
Two rotation fulcrums 60 and 62 out of the four rotation fulcrums 59 to 62 projecting from B contact the bottom surface of the lower drum Dd, and the two rotation fulcrums 60 and 62. , The center axis 49 of the upper drum Du and the lower drum Dd is rotated counterclockwise in the direction of 0-180 degrees. The lead ring Lr is screwed into the lead ring Lr so that the center axis of the lead ring Lr is turned by a predetermined amount in the counterclockwise direction, and the leading end of the lead ring Lr contacts the bottom surface of the lower drum Dd. The two screws 31 and 32 provided in contact with each other are rotated in opposite directions.

By the way, depending on the state of the poorly adjusted magnetic recording / reproducing apparatus used for recording the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus, The state of track bending in a recorded magnetic tape is different. Then, according to the recorded magnetic tape to be reproduced, the recording track of the track bend in which state is recorded, the bend to be performed during the reproduction operation of the magnetic recording / reproducing apparatus. It is necessary to adaptively change the operation mode of the correction operation.

The reproducing operation of the magnetic recording / reproducing apparatus depends on the recorded magnetic tape to be reproduced by the magnetic recording / reproducing apparatus, in which state the recording trace of the track bend is recorded. In order to automatically and adaptively change the operation mode of the bend correction operation to be performed at the time, for example, the magnetic recording / reproducing apparatus is set to be a reproduction target before a full-scale reproduction operation is started. While performing the reproducing operation by running the recorded magnetic tape, the screws 67, which are known in advance to be used in the correction operation for each track bend in various track bend patterns.
According to the combination mode of 77, 29 to 32, various bending correction operations performed by combining the screws selected from the screws 67, 77, 29 to 32 described above are performed in a time-division manner for each bending correction mode. It is only necessary to determine the mode of the bend correction operation in which the envelope of the reproduced FM wave signal can be flattened so that the reproduction operation is performed according to the determined bend correction operation mode. , E.g., a microprocessor, random access memory, R as a look-up table
It can be easily configured using an OM table, a comparator, and the like.

[0093]

As is apparent from the above description, the magnetic recording / reproducing apparatus of the present invention has a rotating magnetic head and a sliding surface for a magnetic tape wound around a part of the peripheral surface. When the rotational trajectory plane of the rotary magnetic head coincides with the upper and lower drums and the recording trace formed on the magnetic tape, the central axis of the rotary magnetic head is inclined by a predetermined angle. The tilt drive means, and the position regulating surface of the magnetic tape is moved to the reference edge position of the magnetic tape while the relative positional relationship between the recording trace formed on the magnetic tape and the rotational locus surface of the rotary magnetic head is maintained. And a second inclination driving means for inclining a member (for example, a lower drum or a lead ring) provided with a position regulating surface of the magnetic tape so as to coincide with the above. The tilt driving by the second tilt driving means is performed prior to the tilt driving by the tilt driving means, and winding of the magnetic tape around the peripheral surfaces of the upper and lower drums. The height of the rotating locus surface of the rotating magnetic head on the starting end side in the range and the height of the rotating locus surface of the rotating magnetic head on the end side in the winding range of the magnetic tape around the upper and lower drum peripheral surfaces change in opposite directions. Operation, the height of the rotation trajectory surface of the rotary magnetic head on the start end side of the magnetic tape winding range around the upper and lower drum peripheral surfaces, and the end of the magnetic tape winding range on the upper and lower drum peripheral surfaces. Means for performing a combined operation with an operation in which the height of the rotational trajectory surface of the rotating magnetic head on the side is changed in the same direction as the recording operation. Correction of a curved track in a state where the reproducing operation is performed in a state where the magnetic tape is running at the same running speed as the running speed of the magnetic tape in the above can also be accurately performed. Solvable.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention in a direction of 90 degrees to 180 degrees.

FIG. 2 is a side sectional view in a 90-270 degree direction for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG.

FIG. 3 is a side sectional view in the 0 ° -180 ° direction for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 1;

FIG. 4 is a side sectional view in the 0 ° -180 ° direction for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 1;

FIG. 5 is an exploded perspective view of a part of the magnetic recording / reproducing apparatus of the present invention shown in FIG.

FIG. 6 is a diagram exemplifying an inclination correction curve in a conventional device.

FIG. 7 is a diagram illustrating a tilt correction curve in the magnetic recording / reproducing apparatus of the present invention.

FIG. 8 is a side sectional view of a main part of one embodiment of the magnetic recording / reproducing apparatus of the present invention, taken along a direction of 90 ° -180 °.

FIG. 9 is a side sectional view in a 90-270 degree direction for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 8;

FIG. 10 is an exploded perspective view of a part of the magnetic recording / reproducing apparatus of the present invention shown in FIG.

FIG. 11 is a perspective view showing a traveling path of the magnetic recording / reproducing apparatus.

FIG. 12 is a view showing the operation principle of the magnetic recording / reproducing apparatus.

FIG. 13 is an exploded perspective view of a part of the conventional magnetic recording / reproducing apparatus shown in FIG.

FIG. 14 is a view showing a main part of a conventional magnetic recording / reproducing apparatus, that is, 0 degree-18.
It is a side sectional view about a 0-degree direction.

FIG. 15 is a view showing a main part of a conventional magnetic recording / reproducing apparatus, ie, 0 degree-18.
It is a side sectional view about a 0-degree direction.

[Explanation of symbols]

DB: drum base, SB: sub-base, D: lower drum, Du: upper drum, DA: drum assembly, T: magnetic tape, Te: reference edge of magnetic tape T, Lr: lead ring, G: lead ring Lr Guide portions provided (position regulation surfaces of the reference edge of the magnetic tape formed on the guide member for regulating the position of the magnetic tape) 1 ... Supply reel stand, 2 ... Take-up reel stand, 3 ... Cassette case, 4 ... Supply reel,
5 ... tension pole, 6, 16 ... guide pole, 7 ...
Full width erasing head, 8 ... impedance roller, 9, 14
... Loading pole (vertical guide roller), 10, 13
... Slope guide (slant pole), 15 ... Control head, 17 ... Pinch roller, 18 ... Capstan, 1
9: take-up reel, 20: machine stand, 21, 49: central axis,
23 ... knife edge, 25-28, 35-38, 59-
62, 71 to 76: rotation fulcrum, 29 to 32, 40: motor, 41: reduction mechanism composed of a plurality of gears, 42: position detector, 43: rotary encoder, 63, 64: coupling pins, 67, 77 ... Screw, 70 ... projection,

Claims (2)

[Claims] 1. A rotating magnetic head, an upper and lower drum having a sliding contact surface for a magnetic tape wound around a part of a peripheral surface, and a rotating magnetic head for recording marks formed on the magnetic tape. First tilt drive means for tilting the central axis of the rotary magnetic head by a predetermined angle when the rotational trajectory surfaces of the heads coincide with each other; and a recording mark formed on the magnetic tape and rotation of the rotary magnetic head. The member provided with the position regulating surface of the magnetic tape is inclined so that the position regulating surface of the magnetic tape coincides with the reference edge position of the magnetic tape while the relative positional relationship with the track surface is maintained. And the second tilt driving means is preceded by the first tilt driving means. Configured And the height of the rotation trajectory surface of the rotary magnetic head at the start end in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums and the end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums In which the height of the rotation locus surface of the rotary magnetic head is changed in the opposite direction, and the height of the rotation locus surface of the rotary magnetic head on the starting end side in the winding range of the magnetic tape around the upper and lower drums. Means for performing a combined operation with an operation in which the height of the rotational trajectory surface of the rotary magnetic head on the end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums is changed in the same direction. A magnetic recording / reproducing apparatus comprising: 2. An upper drum having a sliding surface for a magnetic tape wound around a part of a peripheral surface of an upper and lower drum, a rotary magnetic head, and extension of a sliding surface of the magnetic tape on the upper drum. A lower drum provided coaxially with the upper drum, and a rotational locus surface of a rotary magnetic head with respect to a recording mark formed on the magnetic tape. The first inclination driving means for inclining the central axes of the upper and lower drums and the rotary magnetic head by a predetermined angle when the states coincide with each other, and the upper and lower drums are configured separately. The magnetic tape is provided in a position close to the outer peripheral surface of the small diameter portion formed at the lower portion of the lower drum, and has a position regulating surface of a reference edge of the magnetic tape at an upper end portion. Shaped on guide member and magnetic tape While maintaining the relative positional relationship between the recording traces formed and the rotational trajectory surface of the rotating magnetic head, the position of the magnetic tape is regulated so that the position regulating surface of the magnetic tape coincides with the reference edge position of the magnetic tape. A second inclination driving means for inclining the traveling position regulating guide member, and prior to the inclination driving operation by the first inclination driving means, the inclination by the second inclination driving means. The height of the rotation trajectory surface of the rotary magnetic head at the start end in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums, and
An operation in which the height of the rotation locus surface of the rotary magnetic head on the end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums is changed in opposite directions; The height of the rotation locus surface of the rotary magnetic head on the start end side in the winding range and the height of the rotation locus surface of the rotary magnetic head on the end side in the winding range of the magnetic tape with respect to the peripheral surfaces of the upper and lower drums are the same. A magnetic recording / reproducing apparatus comprising means for performing a combined operation with an operation that is changed in a direction.