JP3033409B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a magnetic recording / reproducing apparatus, and more particularly, to a rotation locus surface of a rotary magnetic head and a magnetic tape according to a change in a running speed of a magnetic tape running while sliding on a part of a peripheral surface of a drum. The present invention relates to a magnetic recording / reproducing apparatus which enables a rotary magnetic head to trace a recording trace on a magnetic tape satisfactorily by changing a relative spatial positional relationship of the magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art A rotating magnetic head (hereinafter simply referred to as "magnetic head") is run at a predetermined running speed with a magnetic tape wound around a part of the peripheral surface of a drum pair consisting of an upper drum and a lower drum. A video tape recorder (hereinafter, referred to as "VTR") can be given as a typical example of a magnetic recording / reproducing apparatus that performs a recording / reproducing operation by performing a helical scan by using a helical scan. In this type of VTR, in addition to normal reproduction (hereinafter referred to as "normal reproduction") in which recorded information is reproduced at the same magnetic tape traveling speed as during recording, the magnetic tape traveling speed and traveling direction during recording are determined. The so-called variable speed playback (hereinafter, referred to as "trick play") function of performing a playback operation by running a magnetic tape at different running speeds (including stopping) and running directions is widely adopted. Further, like a time lapse or a so-called frame shooting, a magnetic tape can be intermittently run to record an event over a long period of time, and the recorded magnetic tape can be reproduced at a standard speed, for example. Such a VTR is also provided.

FIG. 51 shows a general example of a magnetic tape running system near a drum pair of a VTR. In the figure, a magnetic tape T is supplied from a supply reel (not shown), and is transported along a known traveling system. Then, a supply-side guide roller SGR, a supply-side inclined pole 26, a take-up-side inclined pole 27, and a take-up-side inclined pole 27 are taken. The upper and lower drums Du and Dd are driven by the up-side guide rollers TGR.
And travels obliquely over a predetermined angle range over a drum pair DA consisting of: and then wound up on a take-up reel (not shown) via a known traveling system. At this time, a recording trace pattern (hereinafter referred to as a “tape pattern” or a “track pattern”) as shown in FIG. 53 is formed on the magnetic tape T by the rotary magnetic heads Ha and Hb.

In FIG. 1, a straight line connecting a point labeled "starting point" on the lower edge of the magnetic tape T, a point labeled +1 on the upper edge of the magnetic tape T, and a number of lines parallel to the straight line Indicate the center of each track pattern. When the magnetic tape T on which such a track pattern is formed is reproduced while being transported at the same speed in the same direction as during recording, the rotating magnetic heads Ha and Hb trace each of these tracks, and the normal operation is performed. Reproduction will be performed. However, if the traveling speed or direction of the magnetic tape T during reproduction is different from that during recording, the relative linear velocity between the magnetic tape T and the rotating magnetic heads Ha, Hb changes, so that the rotating magnetic heads Ha, Hb cannot be used. The track pattern drawn on T is, for example, F
F, STILL, and FB.

In FIG. 53, each line drawn when connecting the positions of points indicated as +2, +3... (Indicated by a + sign), the magnetic tape T at the time of recording
When the reproducing operation is performed with the magnetic tape T running at twice, three to seven times the running speed of the magnetic tape T (hereinafter referred to as “F”).
F playback ". 4) shows the rotation trajectories of the rotating magnetic heads Ha and Hb drawn on the magnetic tape T.

Similarly, each straight line drawn when connecting the position of each point shown as -2, -3... -7 and the starting point is opposite to the running direction of the magnetic tape T during recording. In the direction (indicated by a minus sign), the traveling speed of the magnetic tape T is twice, three times... Seven times the traveling speed of the magnetic tape T during recording.
Shows the rotation trajectories of the rotating magnetic heads Ha and Hb drawn on the magnetic tape T when the playback operation is performed by driving the magnetic tape T (hereinafter referred to as “FB playback”). Note that a straight line connecting the starting point and a point indicated as 0 on the upper edge of the magnetic tape T is obtained when the reproducing operation is performed with the magnetic tape T stopped (hereinafter, referred to as “still reproduction”). 2 shows the rotation trajectories of the rotating magnetic heads Ha and Hb drawn on the magnetic tape T.

As a specific example of the track pattern, a VHS (registered trademark) VTR, which is one of the typical VTR systems, is as follows.
In other words, in the most common VHS system VTR, 18
The magnetic tape T runs around a rotary drum having a diameter of 62 mm, which rotates at 00 rotations, in a state of being spirally wound over approximately 180 °. In the recording in the standard mode (hereinafter referred to as “SP mode”), the magnetic tape is set to 33.3 per second.
The recording mark transferred on the magnetic tape T by the rotary magnetic head having a track width of 58 μm, which is transported by 5 mm, forms a video track angle of 5 ° 58′9.9 ″ with respect to the reference edge Te of the magnetic tape T. VH
In addition to the SP mode, the S system VTR has a triple mode (hereinafter referred to as "EP mode") in which a magnetic tape is transported at 11.12 mm per second and recorded by a rotating magnetic head having a track width of 19 μm. In this EP mode, the running speed and track width of the magnetic tape T are reduced to one third of that in the SP mode.
By doing so, it is possible to record three times as long on magnetic tapes of the same length. However, as will be described later, since the track width recorded on the magnetic tape is narrow, in the trick play, in order to allow the rotating magnetic heads Ha and Hb to accurately trace each track, the SP mode is used. It is more difficult than it is.

When the magnetic tape T is stopped, the rotation locus of the rotary magnetic head drawn on the magnetic tape T is 5 ° 56 ′ with respect to the reference edge Te of the magnetic tape T.
For example, the magnetic tape T indicated by the display of +7 in the SP mode in FIG.
A straight line connecting the position of the upper edge of the magnetic head T and the starting point indicates an angle of 6 ° 10′54 ″ with respect to the reference edge Te of the magnetic head T. The straight line connecting the position of the upper edge of the indicated magnetic tape T and the starting point is 5 ° with respect to the reference edge Te of the magnetic head T.
42'25.7 ".

Referring to the track pattern illustrated in FIG. 53, the track pattern recorded on the magnetic tape T in the SP mode and the magnetic tape by the rotary magnetic heads Ha and Hb during trick play. The rotation locus of the rotary magnetic head drawn on T crosses over. Therefore, as shown in FIG. 52 (b), the signal level of the FM signal reproduced at the time of trick play greatly changes every time the rotating magnetic heads Ha and Hb cross the recording trace, and the FM signal during one vertical scanning period Looking at the envelope, a large undulation occurs during one vertical scanning period. For this reason, as a reproduced image at the time of trick play, only a reproduced image of poor quality having a noise bar in the image can be obtained.

Recently, three recording marks having a recording mark width of 19 μm are simultaneously recorded in parallel on a magnetic tape T, and a recording mark pattern as shown in FIG. A new type of VTR has been proposed in which a VTR is formed to enable recording and reproduction of so-called high-vision image information. In this new type of VTR, two adjacent recording marks among the three recording marks formed in parallel on the magnetic tape T are simultaneously formed by two rotating magnetic heads having azimuth angles opposite to each other. It is used for recording and reproduction of a video signal, and the remaining one recording trace is used for recording and reproduction of an acoustic signal by another rotating magnetic head.

When the recorded magnetic tape T recorded by such a new type of VTR is run at a speed higher than that at the time of recording and FF reproduction or FB reproduction is attempted,
The movement locus of the rotary magnetic head is, for example, from the point indicated as “start point” in FIG.
Is indicated by a straight line connecting the position of the upper edge of the magnetic tape T indicated by the numeral +7 or -7 described above the upper edge. Therefore, two rotating magnetic heads for video having different azimuth angles perform a reproducing operation across three recording traces formed on the magnetic tape T, so that the reproduced image is reproduced. Is full of noise bars.

Further, although not described in detail, most recently proposed consumer digital VTRs compress and record the video signal data amount using a high-efficiency encoding method, so that it can be used during FF reproduction. When the rotating magnetic head performs a reproducing operation across the recording trace of the magnetic tape T as in the case of FB reproduction, an image cannot be reproduced at all depending on the arrangement state of the blocks of data arranged in a mosaic pattern. Occur.

In order to solve such a problem, it is only necessary to make the rotation locus of the rotary magnetic head coincide with the recording trace of the magnetic tape T, and the following methods have been conventionally proposed. A rotating magnetic head is mounted on an electro-mechanical transducer as an actuator, and the electro-mechanical transducer is controlled by an open loop control circuit or a closed loop control circuit so that the rotating magnetic head is moved in a direction crossing a recording mark of the magnetic tape T. A method of displacing the rotating magnetic head along the recording trace of the magnetic tape T. For example, as disclosed in Japanese Utility Model Publication No. 63-34126, Japanese Utility Model Application Publication No. Sho 61-158633, and the like, a rotating drum on which a rotating magnetic head is mounted and a lower drum are integrally inclined to make the rotating head magnetic. A method of making the tape T follow the recording trace. For example, as disclosed in JP-B-61-22376, 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. The height of the guide is changed so that the rotary head follows the recording mark of the magnetic tape T.

[0014]

However, as described above, in a VTR in which the rotation locus of a rotary magnetic head is controlled using an electro-mechanical transducer as an actuator, the electro-mechanical transducer is driven by a rotating drum. Since it must be provided in a narrow space inside, the electromechanical transducer used must have a small shape and size, but the electromechanical transducer having a small shape and size will cause a large displacement to the rotating magnetic head. Difficult to give. In addition, even when the rotating magnetic head is largely displaced by the electro-mechanical transducer, the state of the head touching the magnetic tape must be maintained satisfactorily, but a good head can be obtained by using a small actuator having good operation characteristics. Maintaining touch at all times is difficult. Furthermore, in the actuator, due to the limitation of the amplitude frequency characteristic,
For example, in the SP mode, the noiseless search up to about ± 3 times speed is at most feasible, and is ± 5 times speed or ± 5 times speed.
There is a drawback that high-speed search at 7 × speed or higher cannot be handled.

Further, the above-mentioned Japanese Utility Model Publication No. 63-34126
In the magnetic recording / reproducing apparatus disclosed in Japanese Patent Application Laid-Open Publication No. H10-157, an arc-shaped guide portion for guiding the reference edge Te of the magnetic tape T comes into contact with the reference edge Te of the magnetic tape T in a state close to a point contact. Therefore, the reference edge Te of the magnetic tape T at a portion not in contact with the arc-shaped guide portion must be in an extremely unstable state. When the magnetic tape T is recorded at a relatively low recording density, that is, when the width of the recording trace is relatively large, normal reproduction is barely possible.
There is a problem that noise bars cannot be removed satisfactorily in both F playback and FB playback. The problem is that the magnetic tape T is
When the recording is performed at a relatively high recording density as in the EP mode in the S-system VTR, that is, when the recording trace width is relatively small, the problem is more serious.

Also, the aforementioned Japanese Utility Model Application Laid-Open No. 61-15863.
In the magnetic recording / reproducing apparatus disclosed in Japanese Patent Publication No. 3 (1993) -1995, a member (guide section) for guiding the reference edge Te of the magnetic tape T over a predetermined length is separated from the lower drum and provided on a fixed section of the apparatus. Therefore, the fluctuation of the position of the reference edge Te of the magnetic tape T, which has occurred in the magnetic recording / reproducing apparatus disclosed in Japanese Utility Model Publication No. 63-34126, should be prevented from occurring at least during normal reproduction operation. It is possible. However, if the rotating drum on which the magnetic head is mounted and the lower drum are integrally inclined to perform the FF reproducing operation or the FB reproducing operation or the like, the tape is in sliding contact with the tape sliding surfaces of the upper and lower drums. The running magnetic tape T is
The reference edge Te is inclined with the upper and lower drums and has a tendency to be displaced in a direction away from the guide portion. For this reason, at the time of FF reproduction operation or FB reproduction operation,
With the inclination of the upper and lower drums, the reference edge Te of the magnetic tape T tends to be separated from the guide portion, and the position of the reference edge Te of the magnetic tape T in that portion fluctuates to generate a noise bar. There is.

That is, this method is applied to the VHS system V described above.
When applied to the TR, in the SP mode, the track width of the recording trace on the magnetic tape T is relatively large at 58 μm.
Even if the rotating drum to which the magnetic head is attached and the lower drum are integrally inclined to perform the FF reproduction operation or the FB reproduction operation, a noise bar hardly occurs in the reproduced image. This is because a part of the reference edge Te of the magnetic tape T is separated from a member (guide portion) for guiding the reference edge Te of the magnetic tape T due to the integral inclination of the rotating drum and the lower drum. This is because even if the position of the reference edge Te of the magnetic tape T in the separated portion fluctuates, the amount has little effect on the track width of 58 μm. However, in the EP mode, since the track width is 19 μm, which is one third of the track width in the SP mode, the distance cannot be ignored, and it is apparent that a noise bar may be generated in a reproduced image. Became.

The above problem is caused by simultaneously recording three recording marks having a recording mark width of 19 μm on the magnetic tape T in parallel.
Needless to say, the same applies to the above-described VTR of the new form in which the recording trace pattern as shown in FIG. 54A is formed on the magnetic tape T.
The present invention has been made in order to solve these problems, and has been made in the case where a magnetic tape is run at a speed different from the speed at the time of recording and reproduced, or the magnetic tape is run in a direction opposite to the direction at the time of recording and reproduced. It is an object of the present invention to provide a magnetic recording / reproducing apparatus in which a noise bar does not occur even when the operation is performed.

Further, an object of the present invention is to set the lead angle of the lower drum to 5 ゜ 5 with respect to the reference edge Te of the magnetic tape T.
Recording is performed in a state where the inclination angle is set to 8'9.9 ", that is, so-called frame recording is performed in units of a field or frame signal of a television signal, and the frame-recorded pattern satisfies the VHS standard. It is an object of the present invention to provide a magnetic recording / reproducing apparatus that obtains a continuous moving image such as a CG image when the continuous normal reproduction is performed.

[0020]

Means for Solving the Problems The present invention has been made in view of the above problems, and the invention according to claim 1 is:
"A drum pair comprising an upper drum and a lower drum having at least a lead for guiding a reference edge of the magnetic tape and a sliding surface of the magnetic tape is provided, and a rotating magnetic head is used to form one of the peripheral surfaces of the drum pair. A magnetic recording / reproducing apparatus for recording / reproducing a signal by forming an inclined track on a magnetic tape in a state wound around a portion, in or near the rotation locus plane of the rotary magnetic head and the center of the lower drum A support fulcrum for the rotation locus surface provided on a straight line perpendicular to the axis; a rotation locus surface rotating means for rotating the rotation locus surface of the rotary magnetic head around the straight line over a predetermined angle; An intermediate member having a rotating magnetic head and a bearing for supporting a rotating shaft of the rotating magnetic head; and a suspending means for coaxially suspending the intermediate member with respect to the lower drum. Between the member and the rotating gauge Magnetic recording and reproducing apparatus is characterized by providing the support fulcrum of the surface. "Is intended to provide a,

According to a second aspect of the present invention, there is provided the magnetic recording / reproducing apparatus according to the first aspect, wherein the straight line passes through a substantially central position of a winding range of the magnetic tape around the peripheral surface of the pair of drums. Magnetic recording and reproducing device. "

According to a third aspect of the present invention, in the magnetic recording / reproducing apparatus according to the first or second aspect, the suspension means intersects the support fulcrum perpendicular to the center axis of the lower drum with respect to the rotation locus plane. A first edge formed on the outer diameter of the intermediate member to loosely fit with the inner diameter of the lower drum in the vicinity of a plane including the lower drum, and a support for resiliently supporting the intermediate member on a base of the device; And a magnetic recording and reproducing apparatus.
To provide

According to a fourth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to any one of the first to third aspects, wherein the supporting fulcrum of the rotation locus surface projects inward of the lower drum. A pair of holes provided in one of the formed second edge portion and the surface of the intermediate member opposed to the second edge portion; And a pair of pins provided on the other of the surface of the intermediate member facing the second edge and the second edge. "

According to a fifth aspect of the invention, there is provided a magnetic recording / reproducing apparatus according to the first or second aspect, wherein the suspension means is arranged so that the support fulcrum perpendicular to the center axis of the lower drum is provided on the rotation locus plane. A first edge formed on the inner diameter of the lower drum for loosely fitting with the outer diameter of the intermediate member in the vicinity of a plane including the support, and a support for resiliently supporting the intermediate member on a base of the apparatus. And a magnetic recording and reproducing apparatus.
To provide

According to a sixth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to any one of the first, second, and fifth aspects, wherein the supporting fulcrum of the rotation locus surface is located outside the intermediate member. A pair of holes provided in one of a second edge formed so as to protrude toward the lower edge and a surface of the lower drum opposed to the second edge, and each of the pair of holes is loosely fitted to the pair of holes. And a pair of pins provided on the other of the second edge and the surface of the lower drum facing the second edge. " And

According to a seventh aspect of the present invention, in the magnetic recording / reproducing apparatus according to the sixth aspect, the second edge formed so as to protrude outward from the intermediate member has an outer diameter equal to the lower drum. A magnetic recording / reproducing apparatus, wherein the outer diameter of the magnetic tape sliding contact surface is the same as that of the magnetic recording / reproducing apparatus.

According to an eighth aspect of the present invention, there is provided a drum pair comprising: an upper drum; and a lower drum having at least a lead for guiding a reference edge of the magnetic tape and a sliding surface of the magnetic tape. In a magnetic recording / reproducing apparatus for recording / reproducing a signal by forming an inclined track on a magnetic tape wound around a part of a peripheral surface of the pair of drums by a magnetic head, the rotary magnetic head and the rotary magnetic head An intermediate member having a bearing for supporting the rotating shaft of the rotary magnetic head, and the intermediate member and the lower drum on a straight line orthogonal to the center axis of the lower drum in or near the rotation locus plane of the rotary magnetic head. And a rotation path rotating means for rotating the rotation path surface of the rotary magnetic head around the straight line over a predetermined angle, the flexible member comprising: Is
A large-diameter ring whose outer diameter is fitted to the inner diameter portion of the lower drum; a small-diameter ring whose inner diameter is fitted to the outer diameter portion of the intermediate member and provided concentrically with the large-diameter ring; A connecting member for connecting the large-diameter ring and the small-diameter ring at two locations, wherein the large-diameter ring is fixed to the lower drum and the small-diameter ring is fixed to the intermediate member. Recording and playback device. "

According to a ninth aspect of the present invention, in the magnetic recording / reproducing apparatus according to the eighth aspect, the straight line passes through a substantially central position of a winding range of the magnetic tape around the peripheral surface of the drum pair. Magnetic recording and reproducing device. "

According to a tenth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to any one of the first to ninth aspects.
The rotation locus plane rotating means is a cam member that presses the intermediate member in a direction perpendicular to the straight line and parallel to the central axis of the lower drum in a plane including the central axis of the lower drum. Magnetic recording and reproducing apparatus. "

An eleventh aspect of the present invention provides a magnetic recording / reproducing apparatus according to any one of the first to ninth aspects.
The rotation locus plane rotating means is a cam member that presses the intermediate member in a direction orthogonal to the center axis of the lower drum and not including the support fulcrum of the rotation locus plane and orthogonal to the straight line. A magnetic recording / reproducing apparatus characterized by the above-mentioned. "

According to a twelfth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to any one of the first to eleventh aspects, wherein the magnetic recording / reproducing apparatus is provided at an entrance side of the pair of drums in a traveling path of the magnetic tape. A first guide roller that regulates the traveling height of the magnetic tape, and a second guide roller that is provided on the exit side of the pair of drums and regulates the traveling height of the magnetic tape in a traveling path of the magnetic tape. A first displacement driving means for changing the height of the first guide roller in the width direction of the magnetic tape; and a second displacement driving means for changing the height of the second guide roller in the width direction of the magnetic tape. And a displacement drive unit. "

The invention according to claim 13 is characterized in that "the upper drum,
A drum pair comprising at least a lead for guiding a reference edge of the magnetic tape and a sliding surface of the magnetic tape, the drum pair being wound around a part of the peripheral surface of the drum pair by a rotating magnetic head; A magnetic recording / reproducing apparatus for recording / reproducing a signal by forming an inclined track on a magnetic tape in a state where the lower drum is supported on a first straight line orthogonal to a center axis of the lower drum; A support fulcrum of the rotation locus plane provided on or near a rotation locus plane of the rotary magnetic head and on a second straight line parallel to the first straight line; A lower drum rotating means for rotating the rotating locus surface around the second straight line for a predetermined angle; and a rotating locus surface rotating means for rotating the rotating locus surface around the second straight line for a predetermined angle. Characteristic magnetic recording / reproducing device. "

According to a fourteenth aspect of the present invention, in the magnetic recording / reproducing apparatus according to the thirteenth aspect, the first straight line passes through a substantially central position of a winding range of the magnetic tape around the peripheral surface of the pair of drums. A magnetic recording and reproducing apparatus. "

According to a fifteenth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus according to the thirteenth or fourteenth aspect, wherein the intermediate member comprising the rotary magnetic head and a bearing for supporting a rotary shaft of the rotary magnetic head is provided. A first suspension means for coaxially suspending the intermediate member with respect to the lower drum; and a second suspension means for suspending the lower drum with respect to a base of the apparatus. A magnetic recording / reproducing apparatus, wherein the support fulcrum of the rotation locus plane is provided between the intermediate member and the support fulcrum of the lower drum is provided between the base and the lower drum. " To provide

According to a sixteenth aspect of the present invention, there is provided a magnetic tape having a pair of drums including an upper drum and a lower drum, which is wound around a part of the peripheral surface of the pair of drums by a rotating magnetic head. In a magnetic recording / reproducing apparatus which performs a recording / reproducing operation of a signal by forming a track, a step formed in a lower portion of the lower drum and having a diameter smaller than that of the lower drum in contact with a magnetic tape, and a play in the step. A lead portion which fits to form an edge portion of the lower drum having a larger diameter than the sliding surface of the magnetic tape and guides a reference edge of the magnetic tape; and a first straight line orthogonal to the central axis of the lower drum. First rotating means for integrally rotating the drum pair and the rotating magnetic head around a predetermined angle around;
A magnetic recording / reproducing apparatus comprising: a second rotating means for rotating the lead portion around a second straight line parallel to the first straight line at a predetermined angle. ”.

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

[0047]

In the case where the upper drum Du is not rotated, a known member such as an intermediate drum or a head bar, which is mounted with a magnetic head and rotates, is placed in the gap between the upper drum Du and the lower drum Dd. Needless to say, the configuration should be provided.

In FIGS. 1 and 18, Ha denotes a rotating magnetic head mounted on the upper drum Du. S in the figure
A rotary magnetic head Ha in which a P-mode magnetic head (hereinafter, referred to as “SP head”) and an EP-mode head (hereinafter, referred to as “EP head”) are disposed adjacent to each other is shown. The upper drum (rotary drum) D
A rotating magnetic head Hb (for example, see FIG. 4) is attached to u at a position symmetrical with respect to the magnetic head Ha by 180 degrees. It goes without saying that the magnetic head to be mounted on the upper drum Du is not limited to these rotary magnetic heads Ha and Hb.

As described above, the lower drum Dd fixed to the drum base DB functioning as a part of the fixed portion of the magnetic recording / reproducing apparatus has the reference edge Te (see FIG. 53) is provided. Then, regardless of the reproduction mode of the magnetic recording / reproducing apparatus, the magnetic tape T wound around a part of the peripheral surface of the upper drum Du and the lower drum Dd is placed on the outer peripheral surface of the lower drum Dd. The guide portion G is provided so as to run or stop on the peripheral surface of the drum while the reference edge Te is reliably guided.

FIG. 2 shows that the magnetic tape T
FIG. 6 is a plan view of the drum pair DA showing a state in which is wound. In the figure, reference numerals 26 and 27 denote inclined poles used as a part of a mechanism for loading the magnetic tape T on the outer peripheral surface of the drum pair DA. The magnetic tape T is at a center angle of the drum of 18 with respect to the outer peripheral surface of the drum pair DA.
It is wound in a range corresponding to an angle slightly larger than 0 degrees.

In the figure, O indicates the position of the center axis of the lower drum Dd in the drum pair DA. In the figure, the position indicated by 90 degrees is the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum. is there. The straight line L1 is a straight line connecting the center position of the winding range of the magnetic tape to the peripheral surface of the drum and the position O of the center axis of the lower drum Dd, and the straight line L2 is the position of the center axis of the lower drum Dd. It is a straight line passing through O and orthogonal to the straight line L1. In the magnetic recording / reproducing apparatus of the present invention, since the lower drum Dd is fixed to the drum base DB functioning as a part of the fixing portion of the apparatus as described above, the position of the center axis of the lower drum Dd is , Are always held in a fixed position, shown as a straight line YY in FIG.

In FIG. 1, the upper drum Du to which the magnetic heads Ha and Hb are attached is attached to the intermediate member SA (see FIGS. 4 and 5) via bearings 5 and 6 of the rotating shaft 1 of the drum motor Md. ing. And, this intermediate member SA
Is suspended between the lower drum Dd and the drum base DB in the inner space 29a of the lower drum Dd, and is provided between the intermediate member SA and the drum base DB for tilt adjustment. It is configured to be inclined by being pressed by an annular cam member CA (hereinafter, simply referred to as “annular cam member CA”) (see FIGS. 4 and 5). Due to the inclination of the intermediate member SA, the direction of the center axis of the upper drum Du is set, for example, at a point Oc between a direction indicated by a dashed line (FB reproduction) and a direction indicated by a dotted line (FF reproduction) in FIG. Change to the center.

In FIG. 18, the magnetic head H
The upper drum Du to which a and Hb are attached has a rotor 92 (see FIG. 19) of the drum motor Md fixed thereto, and the upper drum Du has a fixed shaft 99 fixed through bearings 93 and 94. It is attached to the intermediate member SA (see FIGS. 19 and 20). The intermediate member SA is suspended between the lower drum Dd and the drum base DB in the inner space 29a of the lower drum Dd, as described with reference to FIG. , Annular cam member CA
(Fig. 1)
9, see FIG. 20).

The intermediate member SA fits with the inner diameter of the lower drum Dd on a plane orthogonal to the center axis of the lower drum Dd in the vicinity of the rotation locus plane of the rotary magnetic heads Ha and Hb. In the plane of the lower drum Dd
Are rotatably supported by two pivots formed on a straight line L3 which is orthogonal to the central axis and is parallel to the straight line L1. Therefore, by rotating the intermediate member SA about the straight line L3 as the center of rotation, a plane including a straight line L4 (parallel to the straight line L2) orthogonal to the straight line L3 and passing through the center axis of the lower drum and the center axis of the lower drum. When the rotary shaft 1 is tilted within the rotary drum, the rotary magnetic heads Ha, H attached to the upper drum Du are rotated.
Since the inclination of the rotation locus plane b changes, it becomes possible to enable the rotating magnetic heads Ha and Hb to track the recording trace of the magnetic tape T well.

First, a first embodiment of the magnetic recording / reproducing apparatus according to the present invention will be described with reference to FIGS. FIG.
FIG. 2A is a cross-sectional view of a configuration around a pair of drums according to the first type described above with reference to FIG. 1, and shows a cross section at a 90-270 degree line position in FIG. 2. Similarly, FIG.
(B) shows a cross section at a 0-180 degree line position in FIG. FIG. 5 is an exploded perspective view of a main part around the drum pair shown in FIG. 4, and FIGS.
(G) shows the lower drum Dd, the intermediate member SA, the annular cam member CA, and the drum base DB as viewed from the same direction. FIGS. 6B and 6D are views of the lower drum Dd and the intermediate member SA shown in FIGS. FIG. 6F is a side view of the annular cam member CA shown in FIG. 5E, and FIG. 6H is a rotation fulcrum member 30, 31 shown in FIG.
FIG. 4 is an enlarged perspective view of FIG.

The lower drum Dd having a guide portion G for the reference edge of the magnetic tape formed on the outer peripheral surface is fixed to the drum base DB by a plurality of screws 32. The intermediate member SA provided in the inner space portion 29a formed inside the lower drum Dd is provided with an edge portion 28 protruding from the upper end of the outer peripheral surface thereof. The lower drum Dd is fitted to the inner peripheral surface with a predetermined slight clearance. That is, the edge 28 of the intermediate member SA is
The outer diameter is configured to have a diameter slightly smaller than the inner diameter of the inner space 29a of the lower drum Dd.
In addition, it is desirable to provide an R-shape around the point Oc in FIG. Thereby, the fitting clearance can be made sufficiently small after providing the edge portion 28 with a structurally sufficient thickness.
That is, when the intermediate member SA rotates around the point Oc (the straight line L3), the tip of the edge portion 28 can smoothly rotate without biting the inner diameter of the lower drum Dd, and can rotate the intermediate member SA. The moving center is accurately maintained on the point Oc.

Further, the intermediate member SA is moved with respect to the lower drum Dd by the rotation fulcrum members 30 and 31 provided at two positions on the straight line L3 located near the rotation locus plane of the rotary magnetic heads Ha and Hb. It is rotatably supported. That is, the pin-shaped turning fulcrum members 30, 3 implanted at the upper end 28a of the intermediate member SA at the position on the straight line L3.
The two rotation support points are formed by loosely fitting 1 with two through holes 29b provided in the edge portion 29 of the lower drum Dd. As shown in FIG. 5 (h), the rotation fulcrum members 30, 31 have a predetermined diameter between the small diameter portion 30a to be loosely fitted in the through hole 29b of the lower drum Dd and the lower drum Dd and the intermediate member SA. Large-diameter spacer part 3 for maintaining the interval
0b and a small diameter portion 30c to be implanted in the intermediate member SA.

Here, the two members formed between the lower drum Dd and the intermediate member SA by the rotation fulcrum members 30, 31.
The surface including the rotation fulcrum and the surface where the edge 28 of the intermediate member SA is fitted to the inner wall surface of the lower drum Dd are configured to be very close to each other. Further, the surfaces including the two rotation fulcrums formed between the lower drum Dd and the intermediate member SA by the rotation fulcrum members 30 and 31 form rotating magnetic heads Ha and H.
b is close to the rotation locus plane. With such a configuration, the intermediate member SA is rotated with the straight line L3 connecting the two rotation fulcrums as the center axis of rotation, and the rotation shaft is rotated in a plane including the straight line L4 and the center axis of the lower drum. Even if the rotation trajectories of the rotary magnetic heads Ha and Hb are changed by inclining 1, the rotation trajectories of the rotary magnetic heads Ha and Hb do not greatly deviate from the position of the extension surface of the outer peripheral surface of the lower drum Dd. Therefore, a good reproduced image is always obtained without deteriorating the contact state between the magnetic gaps of the rotating magnetic heads Ha and Hb and the magnetic tape T.

Next, acting on the intermediate member SA, the intermediate member S
A mechanism for rotating A will be described. Drum base D
One specific configuration example of the annular cam member CA provided between B and the intermediate member SA is shown in FIG. In the drum base DB, as shown in FIG.
A guide groove 33 into which the annular portion 34 of the annular cam member CA is fitted is provided, and the annular portion 34 of the annular cam member CA is rotatably fitted into the guide groove 33. Is positioned. In the annular portion 34 of the annular cam member CA, cam contours 34a and 34b having predetermined shapes are provided.
Are formed.

The annular portion 34 is provided with a gear 22 via a connecting portion 35. The intermediate member SA and the annular cam member CA are elastically connected to and supported by the drum base DB by the urging of the springs 38 to 41. As shown in FIG. 4A, the springs 38, 39 are provided with holes 44, 4 provided in the drum base DB.
5 and holes 46 and 47 provided in the intermediate member SA, and the springs 40 and 41 are connected to holes 48 and 49 provided in the drum base DB and the drum motor as shown in FIG. It is inserted into holes 50 and 51 provided in the mounting board 7.

The gear 22 of the annular cam member CA has
As shown in (1), the rotational force of the motor Mg is transmitted through the speed reducer 19, the output shaft 20, and the pinion 21. Then, in response to the forward / reverse rotation of the motor Mg, the annular cam member CA has an annular portion 34 whose drum base DB
And is guided by the guide groove 33. At this time, the driven members 36, 37 provided on the intermediate member SA engage with the cam contours 34a, 34b of a predetermined shape formed on the annular portion 34 of the annular cam member CA, whereby the intermediate member SA Rotates about a straight line L3 connecting the two rotation fulcrums formed by the rotation fulcrum members 30 and 31. As a result, the rotating shaft 1 of the drum motor Md, which is the rotating shaft of the upper drum Du, is inclined and the rotating magnetic heads Ha, H
The position of the rotation locus plane b changes.

The rotating shaft 1 of the drum motor Md for rotatingly driving the upper drum Du is rotatably supported by bearings 5 and 6 provided on the intermediate member SA. The drum motor Md shown in FIG. 4 is of a so-called outer rotor type. An annular permanent magnet 14 is fixed to the support plate 8, and the support plate 8 is attached to the shaft fixing member 11 by screws 9 and 10. This shaft fixing member 1
1 is fixed to the rotating shaft 1 by a set screw after the rotating shaft 1 is fitted in the center hole. Coil 15-1
The mounting member of the stator 105 provided with 8 is mounted on the drum motor mounting substrate 7 and the intermediate member SA by screws 12 and 13. Further, the drum motor mounting board 7 is also mounted on the intermediate member SA by screws 42 and 43 as shown in FIG.

On the other hand, the rotating shaft 1 rotatably supported by bearings 5 and 6 provided on the intermediate member SA
It is fitted and fixed to the upper drum fixing member 2. The upper drum Du is fixed to the upper drum fixing member 2 by screws 3 and 4, and the drum motor Md rotates the upper drum Du by the rotation shaft 1. Reference numeral 23 denotes a rotary transformer on the upper drum Du side, and reference numeral 24 denotes a rotary transformer on the intermediate member SA side. Rotary transformer 23, 2
Since the gap between the four signals is kept constant, the level of the transmitted signal does not fluctuate.

The motor Mg is a motor of a power source of a driving mechanism used when changing the amount of rotation of the intermediate member SA, that is, the amount of inclination of the rotating shaft 1, and is controlled by a drive control circuit (not shown). The rotational force is reduced by the speed reducer 19 and the output shaft 2
0 is transmitted to the annular cam member CA via the pinion 21 and the gear 22. Reference numeral 25 denotes a position detecting device (for example, a photo interrupter) for detecting the rotational position of the annular cam member CA, which is attached to the drum base DB (see FIG. 1). The position detection device 25 generates a position detection signal in cooperation with position detection through holes 52 to 54 (see FIG. 5) provided at specific positions of the gear 22 of the annular cam member CA. .

The position detection signal is supplied to the above-described drive control circuit (not shown). The position detecting device 25 is provided with, for example, a structure including a ball which is urged by a spring and abuts against the annular cam member CA, while the gear 22 of the annular cam member CA has a through hole 55. 5 to 57 (see FIG. 5E), and these constitute a stopper mechanism. That is, a selected one of the stopper through holes 55 to 57 provided at a specific position of the gear 22 of the annular cam member CA.
The rotational position of the annular cam member CA, that is, the inclination of the rotating shaft 1 can be set by engaging the ball with the individual members.

FIG. 7 shows a cam profile 34a, 34b formed in the circumferential direction of the annular portion 34 when the annular cam member CA is rotated, and a cam follower of the intermediate member SA abutting against these. FIG. 7 is a diagram showing a relationship between the rotation magnetic heads and the rotation magnetic heads, and a change in a position of a rotation locus plane of the rotating magnetic heads at that time. FIGS. 7 (a), (d), and (g) correspond to FIG.
As in the vertical sectional view shown in FIG.
FIG. 3 is a cross-sectional view of the drum pair DA at an A-line position (a 0-180 ° line position in FIG. 2).

The YY line in the sectional view near the drum pair DA shown in each of FIGS. 7A, 7D, and 7G corresponds to the direction of the center axis of the lower drum Dd (FIG. 3). (Same in the direction of the straight line Y-Y in the drawing). FIG. 7A is a cross-sectional view of the vicinity of the drum pair DA when normal reproduction is performed, and shows a state in which the rotating shaft 1 coincides with the center axis of the lower drum Dd. FIG. 6B shows the annular cam member CA at this time.
It is a top view which shows the state of rotation adjustment of. Note that the straight lines L1 and L2 in the figure correspond to the straight lines L1 and L2 shown in FIG. FIG. 7C is a side view of the annular cam member CA during normal reproduction.

FIG. 7D is a cross-sectional view of the vicinity of the drum pair DA when performing FF reproduction, and shows a state where the rotating shaft 1 is inclined rightward with respect to the center axis of the lower drum Dd. I have. FIG. 7E is a plan view showing the state of rotation adjustment of the annular cam member CA at this time. Also, FIG.
It is a side view of the annular cam member CA at the time of FF reproduction. FIG. 7G is a cross-sectional view of the vicinity of the drum pair DA when performing FB reproduction, and shows a state where the rotating shaft 1 is inclined leftward with respect to the center axis of the lower drum Dd. . FIG. 7H is a plan view showing the state of rotation adjustment of the annular cam member CA at this time. Also, FIG.
It is a side view of the annular cam member CA at the time of FB reproduction | regeneration.

The setting of the reproducing operation mode in the magnetic recording / reproducing apparatus of the present invention is performed by the operator inputting the information on the operation mode to an operation unit (not shown) of the magnetic recording / reproducing apparatus. When the reproduction operation mode is changed to the normal reproduction mode, the FF reproduction mode, and the FB reproduction mode, in response to these reproduction mode changes,
It is necessary that the annular cam member CA is accurately rotated to a predetermined rotation position selected on the drum base DB and is fixed at that position. Hereinafter, the operation of the magnetic recording / reproducing apparatus when each reproducing operation mode is designated will be described.

When the normal reproduction mode is designated, a control device (not shown) is provided on the annular cam member CA via the motor Mg, the speed reducer 19, the output shaft 20, and the pinion 21 (see FIG. 1). The power of the motor is transmitted to the gear 22 to rotate the annular cam member CA.
As a result, the cam contours 34a and 34b formed in the circumferential direction of the annular cam member CA act on the cam followers 36 and 37 formed on the intermediate member SA, and the intermediate member about the straight line L3 as the rotation center. Rotate SA. Thus, the rotating shaft 1 supported on the intermediate member SA via the bearings 5 and 6
Is aligned with the center axis of the lower drum Dd (FIG. 7).
(State (a)), the gear 2 of the annular cam member CA
The normal reproduction mode through-hole 53 provided in 2 reaches the position detection device 25, and the position detection device 25 generates a position detection signal. The operation of the drive control circuit is controlled by the position detection signal, the rotation of the motor Mg is stopped, and the ball urged by the spring in the stopper mechanism provided in the position detection device 25 moves the annular cam. The annular cam member CA is engaged with the stopper through hole 56 provided in the member CA to fix the annular cam member CA at a rotation position determined corresponding to normal reproduction.

Next, the operation when the FF reproduction mode is designated will be described. When the FF playback mode is specified, the control device (not shown) includes the motor Mg,
9, via output shaft 20, pinion 21 (see FIG. 1),
The power of the motor is transmitted to the gear 22 provided on the annular cam member CA to rotate the annular cam member CA. As a result, the cam contours 34a and 34b formed in the circumferential direction of the annular cam member CA act on the cam followers 36 and 37 formed on the intermediate member SA, and the intermediate member about the straight line L3 as the rotation center. Rotate SA. As a result, when the rotating shaft 1 supported by the intermediate member SA via the bearings 5 and 6 is inclined rightward with respect to the center axis of the lower drum Dd (the state shown in FIG. 7D). The through hole 54 for the FF reproduction mode provided in the gear 22 of the annular cam member CA reaches the position detection device 25, and the position detection device 25 generates a position detection signal. The operation of the drive control circuit is controlled by the position detection signal to stop the rotation of the motor Mg. The annular cam member CA is engaged with the stopper through hole 57 provided in the
It is fixed at a rotation position determined corresponding to reproduction.

Next, the operation when the FB playback mode is designated will be described. When the FB reproduction mode is designated, the control device (not shown) controls the motor Mg and the speed reducer 1
9, via output shaft 20, pinion 21 (see FIG. 1),
The power of the motor is transmitted to the gear 22 provided on the annular cam member CA to rotate the annular cam member CA. As a result, the cam contours 34a and 34b formed in the circumferential direction of the annular cam member CA act on the cam followers 36 and 37 formed on the intermediate member SA, and the intermediate member about the straight line L3 as the rotation center. Rotate SA. As a result, when the rotating shaft 1 supported by the intermediate member SA via the bearings 5 and 6 is inclined leftward with respect to the center axis of the lower drum Dd (the state shown in FIG. 7G). The through hole 52 for the FB reproduction mode provided in the gear 22 of the annular cam member CA reaches the position detection device 25, and the position detection device 25 generates a position detection signal. The operation of the drive control circuit is controlled by the position detection signal to stop the rotation of the motor Mg. The annular cam member CA is engaged with the stopper through hole 55 provided in
It is fixed at a rotation position determined corresponding to reproduction.

FIG. 8 is a view showing another example of the configuration of the annular cam member CA. FIG. 8A is a perspective view of a part of the annular cam member CA, and O in the figure indicates a center point of the annular portion 34 in the annular cam member CA. The annular portion 34 includes straight lines Lf2, Lf1, Ln, Ln2 passing through the center point O at both sides of the 90-270 ° line shown in the figure.
A pair of different cam profiles 60 to 69 are respectively formed corresponding to the positions on Lb1 and Lb2. FIG. 8B
FIG. 9 is a side view of the annular portion 34 showing a configuration of cam profiles 61, 63, 65, 67, and 69 formed on a part of the annular portion 34 of the annular cam member CA. In the display of -11, -5, 0, +5, +11 shown in the figure,
0 indicates a cam profile for normal reproduction, and -5
And -11 indicate that they are cam contours for -5 times and -11 times speed FB reproduction, respectively, and +5 and +11 codes respectively indicate +5 times and +11 times FF reproduction FFs. Each of them indicates a cam contour.

FIG. 8C shows the cam followers 36 and 37 of the intermediate member SA on the cam contours 60 to 69 of the annular cam member CA.
Are pressed against each other to rotate the intermediate member SA about a straight line L3 connecting the two rotation fulcrums constituted by the two rotation fulcrum members 30 and 31 to the rotation magnetic heads Ha and Hb. FIG. 6 is a diagram showing a state in which the inclination of the rotation locus plane changes. The annular cam member CA shown in FIG.
It is apparent to those skilled in the art that the present invention can be applied to the first embodiment shown in FIG. 4 as it is, instead of the annular cam member CA described with reference to FIG. 5 or FIG. 7, and a detailed description thereof will be omitted.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment has been described above in the manner of fitting the intermediate member SA and the lower drum Dd in the drum pair DA, and in the manner of supporting the intermediate member SA to be rotatable with respect to the lower drum Dd. This is different from the first embodiment. Therefore, these differences will be described, and description of the other points will be omitted. FIG. 6 (a)
FIG. 3 is a cross-sectional view of a component portion including a lower drum Dd portion, an intermediate member SA portion, and a drum base DB portion in the drum pair DA at a position corresponding to a 90-270 degree line position in FIG. is there. Also, FIG.
FIG. 3 is a cross-sectional view at a position corresponding to a 0-180 degree line position in FIG. 2.

The lower drum Dd having the guide portion G of the reference edge of the magnetic tape formed on the outer peripheral surface is fixed to the drum base DB by a plurality of screws 32. An inwardly projecting edge 58 is provided at the upper end of the lower drum Dd. It is fitted on the outer peripheral surface of the member SA with a predetermined slight clearance.
That is, the edge portion 58 of the lower drum Dd is configured such that the inner diameter thereof is slightly larger than the diameter of the outer peripheral surface of the intermediate member SA.

Further, the intermediate member SA is moved with respect to the lower drum Dd by the rotation fulcrum members 30 and 31 provided at two positions on the straight line L3 located near the rotation trajectory plane of the rotary magnetic heads Ha and Hb. It is rotatably supported. That is, the pin-shaped rotating fulcrum members 30, 31 implanted at the upper end of the lower drum Dd at the position on the straight line L3 are:
A rotation fulcrum is formed by loosely fitting each of the two holes provided in the protruding portion 70 of the intermediate member SA. The rotation fulcrum members 30 and 31 used here are substantially the same as those described above with reference to FIG. 5 (h), but in this embodiment, the small diameter portion of 30a is an intermediate portion. Member S
A is loosely fitted in the hole of the protruding portion 70 of A, and differs in that the small diameter portion of 30c is implanted at the upper end of the lower drum Dd.

Here, the two members formed between the lower drum Dd and the intermediate member SA by the rotation fulcrum members 30, 31.
The surface including the rotation fulcrum and the surface where the edge portion 58 of the lower drum Dd fits with the outer peripheral surface of the intermediate member SA are formed very close to each other. Further, the surfaces including the two rotation fulcrums formed between the lower drum Dd and the intermediate member SA by the rotation fulcrum members 30 and 31 form rotating magnetic heads Ha and H.
The outer peripheral surface 70a of the protruding portion 70 of the intermediate member SA is separated from the rotation locus surface b by a slight length in the generatrix direction. The intermediate member SA and the annular cam member CA are elastically connected to and supported by the drum base DB functioning as a fixing portion of the apparatus by the bias of the springs 38 to 41.

Since the present embodiment has such a configuration,
Even when the intermediate member SA rotates around the straight line L3, the upper drum Du (not shown) and the upper end 70b of the intermediate member SA
(Or the distance between the upper end portion 70b of the intermediate member SA and the rotation trajectory surfaces of the rotating magnetic heads Ha, Hb fixed to the upper drum) is kept constant without change. You. Similarly, the protrusion 7 formed on the outer peripheral surface of the upper drum Du (not shown) and the intermediate member SA.
Since the two surfaces of the outer member 70 and the outer surface 70a are kept in a state where they are included in the surface extending from the other surface, the intermediate member S
Even if A is rotated to change the rotation trajectories of the rotary magnetic heads Ha and Hb, the contact state between the magnetic gaps of the rotary magnetic heads Ha and Hb and the magnetic tape T does not change, and a good reproduced image is always obtained. Obtainable.

Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the point that the hollow cylindrical rotary transformers 73 and 74 are used for signal transmission and the rotation fulcrum of the intermediate member SA with respect to the lower drum Dd are located at positions near the rotary shaft 1. This is different from the above-described first or second embodiment in that the fitting of the lower drum Dd and the intermediate member SA is performed at a position close to the rotary shaft 1. Therefore, these differences will be described, and description of the other points will be omitted. FIG. 9 (a)
FIG. 2 is a cross-sectional view of a configuration around a pair of drums according to the first type described above with reference to FIG.
The cross section at the 0 degree line position is shown. Similarly, FIG.
2 shows a cross section at a 0-180 degree line position in FIG. 2 omitting an upper drum Du portion and a drum motor Md portion.

The lower drum Dd having the guide portion G of the reference edge of the magnetic tape formed on the outer peripheral surface is fixed to the drum base DB by a plurality of screws 32. An inwardly protruding edge portion 75 is provided at an inner upper end portion of the lower drum Dd, and a tip of the edge portion 75 is disposed in an inner space formed inside the lower drum Dd. Intermediate member SA
Are fitted with a small clearance. That is, the edge portion 75 of the lower drum Dd is configured such that the inner diameter thereof is slightly larger than the diameter of the outer peripheral surface of the intermediate member SA.

Further, the intermediate member SA is moved with respect to the lower drum Dd by the rotation fulcrum members 30 and 31 provided at two positions on the straight line L3 located near the rotation locus plane of the rotary magnetic heads Ha and Hb. It is rotatably supported. That is, the pin-shaped rotation fulcrum member 30, which is planted at the upper end on the inner peripheral side of the lower drum Dd at the position on the straight line L3,
The rotation fulcrum is formed by loosely fitting the two holes 31 into the two holes of the connecting portion 76 provided in the intermediate member SA. In addition, the members 30 and 3 for rotation fulcrum used here.
1 is substantially the same as that described above with reference to FIG. 5H, but in the present embodiment, the small diameter portion 30a is loosely fitted into the hole of the connecting portion 76 provided in the intermediate member SA. The difference is that the small-diameter portion 30c is implanted at the upper end of the lower drum Dd.

On the other hand, the rotating shaft 1 rotatably supported by bearings 5 and 6 provided on the intermediate member SA is
It is fitted and fixed to the upper drum fixing member 2. The upper drum Du is fixed to the upper drum fixing member 2 by screws 3 and 4, and the drum motor Md rotates the upper drum Du by the rotation shaft 1. Reference numeral 73 denotes a hollow cylindrical rotary transformer on the upper drum Du side, and reference numeral 74 denotes a hollow cylindrical rotary transformer on the intermediate member SA side, which are attached to the upper drum fixing member 2 and the connecting member 76, respectively. Therefore, even if the intermediate member SA rotates and the rotary shaft 1 tilts, the two rotary transformers 23 and 24 rotate integrally, so that the gap between them is maintained in a constant state and transmitted. There is no fluctuation in the level of the signal to be output.

Since the present embodiment has such a configuration,
The rotation fulcrum can completely coincide with the rotation trajectory planes of the rotary magnetic heads Ha and Hb. Can be brought into exactly the same contact state.

Next, a fourth embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the third embodiment described above.
As compared with the embodiment, the aspect in which the annular cam member CA rotates the intermediate member SA is different. Therefore, these differences will be described, and description of the other points will be omitted. FIG. 10A is a cross-sectional view of a component portion including the lower drum Dd portion and the intermediate member SA portion in the drum pair DA at a position corresponding to the 90-270 degree line position in FIG. FIG. 10 (b)
2 is a cross-sectional view of a component portion including the lower drum Dd portion and the intermediate member SA portion in the drum pair DA at a position corresponding to a 0-180 degree line position in FIG.

Holes 80, 83, 8 provided in drum base DB
6, 89, and holes 82,
As shown in FIGS. 10 (a) and 10 (b), individual springs 81, 84, 87 and 90 are respectively mounted on the holes 85, 88 and 91 corresponding to each other. Thus, the intermediate member SA and the upper drum Du are connected to the lower drum Dd.
And the lower drum Dd is resiliently connected to the lower drum Dd via two rotating fulcrum members 30 and 31 provided between the lower drum Dd and the intermediate member SA. . The annular cam member CA used in each of the embodiments described so far is provided with a guide provided on the drum base DB as illustrated in, for example, FIGS. Cam profile 34 whose height from the bottom of groove 33 changes
a, 34b or 60-69,
In this embodiment, as the annular cam member CA for adjusting the inclination of the rotating shaft, a hollow cylindrical body 77 having a plan sectional shape shown in FIGS. 11B, 11D and 11F is used. You.

When the power of the motor is transmitted to the gear 22, similarly to the case of the annular cam member CA described above with reference to FIGS. It is guided and rotated in a state where the outer peripheral surface 77a is fitted to the wall surface 33a of the guide groove 33 formed in the drum base DB. And the inner peripheral surface 77b of the hollow cylindrical body 77 forms a cam profile eccentric with respect to the outer peripheral surface 77a,
Hemispherical cam followers 78, 7 provided on intermediate member SA
9 acts in the horizontal direction in FIG. 10 (b).

FIGS. 11 (a), 11 (c) and 11 (e) are similar to the longitudinal sectional view shown in FIG. 10 (b), respectively.
FIG. 3 is a cross-sectional view of the drum pair DA at an AA line position in FIG. 2 (0-180 degree line position in FIG. 2). FIG. 11 (a),
The YY line in the cross-sectional view near the drum pair DA shown in each of FIGS. 3C and 3E is the direction of the center axis of the lower drum Dd fixed to the drum base DB (FIG. 3). Inside straight line Y-
(Same as the position of Y). FIG. 11A is a cross-sectional view of the vicinity of the drum pair DA when normal reproduction is performed, and shows a state in which the rotating shaft 1 coincides with the center axis of the lower drum Dd. FIG. 7B is a plan view showing the relationship between the state of rotation adjustment of the annular cam member CA and the intermediate member SA at this time. FIG. 11C is a cross-sectional view of the vicinity of the drum pair DA in the case where FB reproduction is performed.
Indicates a state in which it is inclined leftward with respect to the center axis of the lower drum Dd. FIG. 4D shows the annular cam member C at this time.
It is a top view which shows the relationship between the rotation adjustment state of A and intermediate member SA. FIG. 11E is a cross-sectional view of the vicinity of the drum pair DA when performing FF reproduction, and shows a state where the rotating shaft 1 is inclined rightward with respect to the center axis of the lower drum Dd. . FIG. 7F shows the annular cam member CA at this time.
FIG. 9 is a plan view showing the relationship between the state of rotation adjustment and the intermediate member SA.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. Note that the present embodiment and the sixth to seventh embodiments described below in the following order are different from the first to fourth embodiments in that one of the bearings for supporting the rotating shaft 1 is provided on the lower drum Dd. It is different from the example. That is, in the first to fourth embodiments, the bearings 5 and 6 that rotatably support the rotating shaft 1 are provided on the intermediate member SA, and the rotation center (the straight line L3,
Alternatively, in order to uniquely determine the point Oc), the lower drum Dd and the intermediate member SA are connected by the rotation fulcrum members 30 and 31, and the fitting relationship between the lower drum Dd and the intermediate member SA is established. Was used.

On the other hand, in this embodiment to the seventh embodiment, a so-called self-centering type bearing or the like is provided on the lower drum Dd instead of using this fitting relationship, so that the rotation of the intermediate member SA is performed. The moving center (straight line L3 or point Oc) is uniquely determined. Hereinafter, these differences will be mainly described. FIG. 12A is a cross-sectional view of the configuration around the pair of drums according to the first type described above with reference to FIG. 1, and shows a cross section at a 90-270 degree line position in FIG. 2. Similarly, FIG. 12B shows 0 degree-180 in FIG.
3 shows a cross section at a parallel line position. Also, FIG.
13 is an exploded perspective view of a main part around the drum pair shown in FIG.
(A), (c), (e), and (g) show the lower drum Dd, the intermediate member SA, the annular cam member CA, and the drum base DB as viewed from the same direction. In addition, FIG.
FIG. 4D is a view of the lower drum Dd and the intermediate member SA shown in FIGS. FIG. 11F shows the annular cam member C shown in FIG.
FIG. 2A is a side view, and FIG. 2H is an enlarged perspective view of the rotation fulcrum members 30 and 31 shown in FIG.

The lower drum Dd having the guide portion G of the reference edge of the magnetic tape formed on the outer peripheral surface is fixed to the drum base DB by a plurality of screws 32. The intermediate member SA provided in the inner space 29a formed inside the lower drum Dd has a mounting portion 28b of the rotary transformer 24 and members 30 and 3 for rotating fulcrum on the surface of the edge 28c.
1 is provided. The rotary transformer 24 is mounted on the surface of the mounting portion 28b while penetrating the through hole 29c of the lower drum Dd. The members 30 and 31 for rotation fulcrum have small diameter portions 30c and 31c (FIG. 1).
3 (f) is implanted in the edge 28c of the intermediate member SA, and the small-diameter portions 30a, 31a (see FIG. 13 (f)) have two transparent portions provided on the edge 29 of the lower drum Dd. Each of the holes 29b is loosely fitted to form two pivot points.

A bearing 6-1 is provided below the intermediate member SA, while a straight line L connecting the above-described two pivot points is provided.
In the vicinity of 3, a bearing 5-1 is provided on the lower drum Dd to support the rotating shaft 1. And this bearing 6-1 is
For example, a bearing that does not allow the inclination of the rotating shaft 1 such as a double-row deep groove ball bearing is used, while the bearing 5-1 allows a slight inclination of the rotating shaft 1 such as a single-row deep groove ball bearing. Bearings are used. The intermediate member SA and the annular cam member CA are elastically connected to and supported by the drum base DB by the urging of the springs 38 to 41.

In this embodiment, the lower drum Dd
The bearing 5-1 is provided on the lower drum Dd, and the rotating shaft 1 is connected to two rotating fulcrums in order to uniquely determine the center of rotation of the rotating magnetic heads Ha and Hb near the rotation locus plane. L
3 and the bearing 6-1 is connected to the intermediate member SA.
And the rotary shaft 1 is supported, so that there is no need to use a fitting relationship between the lower drum Dd and the intermediate member SA, and the rotation of the intermediate member SA can be performed more smoothly. It is.

Next, a modification of this embodiment will be briefly described with reference to FIG. This modification is similar to the third embodiment described above with reference to FIG. 9 and is a magnetic recording / reproducing apparatus using hollow cylindrical rotary transformers 73 and 74. Like the row deep groove ball bearing, a bearing that allows a slight inclination to the rotating shaft 1 is provided, and the intermediate member SA has, for example, a double row deep groove ball bearing,
It is configured by providing a bearing that does not allow the inclination of the rotating shaft 1. The configuration, operation, and the like of each unit of the present modified example will be apparent from FIG. 14 with reference to FIGS. FIG. 14A is a sectional view of the configuration around the drum pair according to the first type described above with reference to FIG.
The cross section at the 0-270 degree line position is shown. Similarly, FIG. 14B shows a cross section at a 0-180 degree line position in FIG.

Next, a sixth embodiment of the present invention will be described with reference to FIG. In this embodiment, the intermediate member SA
The fifth embodiment is different from the fifth embodiment in that two bearings, such as a single-row deep groove ball bearing, which can slightly tilt the rotating shaft 1 are provided. Therefore, this difference will be described, and the description of the other points will be omitted. FIG. 15A is a cross-sectional view of a configuration around a drum pair according to the first type described above with reference to FIG.
FIG. 3 shows a cross section at a 90-270 degree line position in FIG. 2.
Similarly, FIG. 15B shows a cross section at a 0-180 degree line position in FIG. For the lower drum Dd, similarly to the fifth embodiment, for example, a bearing 5-1 that allows a slight inclination of the rotating shaft 1 such as a single-row deep groove ball bearing is used, while the intermediate member SA has the same configuration. The rotary shaft 1 is supported using the simple bearings 6-2 and 6-3. By adopting such a configuration, each bearing can be constituted by an inexpensive single-row deep-groove ball bearing having a simple structure, and expensive double-row deep-groove ball bearings, roller bearings, etc. as in the fifth embodiment. There is no need to use it.

Next, a modification of this embodiment will be briefly described with reference to FIG. This modification is similar to the third embodiment described above with reference to FIG. 9 and is a magnetic recording / reproducing apparatus using hollow cylindrical rotary transformers 73 and 74. The rotary shaft 1 is provided with a bearing allowing a slight inclination like a row deep groove ball bearing, and the intermediate member SA is provided with, for example, two single row deep groove ball bearings. The configuration, operation, and the like of each unit of the present modification are apparent from FIG. 16 with reference to FIGS. FIG. 16A is a cross-sectional view of the configuration around the pair of drums according to the first type described above with reference to FIG. 1. FIG. 16A is a cross-sectional view taken along a line 90 ° -270 ° in FIG. Show. Similarly, FIG. 16B shows a cross section at a 0-180 degree line position in FIG.

Next, a seventh embodiment of the present invention will be described with reference to FIG. This embodiment is different from the above-described sixth embodiment in that the lower drum Dd and the intermediate member S
A is different from that of FIG. Therefore, this difference is explained,
Description of other points is omitted. FIG. 17 (a)
FIG. 2 is a cross-sectional view of a configuration around a pair of drums according to the first type described above with reference to FIG.
The cross section at the 0 degree line position is shown. Similarly, FIG.
Shows a cross section taken along the line 0-180 in FIG. FIGS. 3C to 3G are diagrams for explaining the configuration of the rotation fulcrum members 30 and 31 provided between the intermediate member SA and the lower drum Dd.

In FIG. 17, pins 30a and 31a are press-fitted into holes provided in the edge 28c of the intermediate member SA (see FIG. 17D). 30b, 31b are grooves 30c, 31 for guiding the tips of these pins 30a, 31a.
c is a substantially semi-cylindrical position regulating member (see FIG. 3E). Also, the position regulating member 30b,
31b is a lower drum Dd at a position corresponding to the pins 30a and 31a press-fitted into the edge 28c of the intermediate member SA with its R surface facing the edge 28c of the intermediate member SA.
Is press-fitted into the hole. Then, the pins 30a, 31a provided on the edge 28c of the intermediate member SA engage with the grooves 30c, 31c of the position regulating members 30b, 31b, whereby the lower member Dd of the intermediate member SA with respect to the lower drum Dd is shown in FIG. The movement in the plane of the paper is regulated. On the other hand, the intermediate member SA is urged upward by the springs 38 and 39, and when the intermediate member SA is rotated around the straight line L3, the edge 28c of the intermediate member SA becomes the R of the position regulating members 30b and 31b.
It will be guided in a state of contact with the surface. Here, the center of curvature of the R surface formed on the position regulating members 30b, 31b is configured to be located on the straight line L3 that is to be the center of rotation of the intermediate member SA.

By forming the rotation fulcrum members 30 and 31 as in the present embodiment, the lower drum Dd and the intermediate member SA are formed.
Can be set at positions apart from the straight line L3 which is the center axis of rotation of the intermediate member SA. That is, this increases the degree of freedom in designing the lower drum Dd and the structure around it. It is needless to say that the configuration of the rotation fulcrum members 30 and 31 described in this embodiment can be applied to some embodiments including the fifth embodiment described above. is there.

In the first to seventh embodiments described above, the magnetic recording / reproducing apparatus of the first type described above with reference to FIG. 1, that is, the drum motor Md is provided below the lower drum Dd. Then, the rotary shaft 1 itself rotates and the upper drum Du attached thereto is driven to rotate. Hereinafter, with reference to FIG.
Magnetic recording / reproducing apparatus of the form
A case where the present invention is applied to a magnetic recording / reproducing apparatus having a configuration in which the rotor d is directly attached to the upper drum Du to rotate and drive the upper drum Du and the shaft itself does not rotate will be described in order of an eighth embodiment and a ninth embodiment. . Since the configuration other than the mounting mode of the drum motor Md is the same as that of the corresponding embodiment described above, only the drawings are shown, and the detailed description is omitted.

First, an eighth embodiment of the magnetic recording / reproducing apparatus according to the present invention will be described with reference to FIGS.
FIG. 19A is a cross-sectional view of the configuration around the pair of drums according to the second type described above with reference to FIG. 18, and shows a cross section at a 90-270 degree line position in FIG. 2. Similarly, FIG. 19B shows a cross section at a 0-180 degree line position in FIG. FIG. 20 is an exploded perspective view of a main part around the drum pair shown in FIG.
(C), (e), and (g) show the lower drum Dd, the intermediate member SA, the annular cam member CA, and the drum base DB, respectively, as viewed from the same direction. The figures (b) and (d) are
It is the figure which looked at lower drum Dd and intermediate member SA shown in the same figure (a) and (c) from the back side, respectively. FIG. 6F is a side view of the annular cam member CA shown in FIG. 6E, and FIG. 6H is a side view of the rotation fulcrum members 30 and 31 shown in FIG. It is an expansion perspective view.

The lower drum Dd having a guide portion G for the reference edge of the magnetic tape formed on the outer peripheral surface is fixed to the drum base DB by a plurality of screws 32. The intermediate member SA provided in the inner space portion 29a formed inside the lower drum Dd is provided with an edge portion 28 protruding from the upper end of the outer peripheral surface thereof. The lower drum Dd is fitted to the inner peripheral surface with a predetermined slight clearance. That is, the edge 28 of the intermediate member SA is
The outer diameter is configured to have a diameter slightly smaller than the inner diameter of the inner space 29a of the lower drum Dd.
It should be noted that it is desirable to provide an R-shape centered on the point Oc in FIG.
This is the same as the case of the first embodiment described above with reference to FIG.

As shown in FIG. 19, the rotor 92 of the drum motor Md is fixed to the upper drum Du by screws 103 and 104. The upper drum Du has bearings 93 and 94.
Is fitted on a fixed shaft 99 fixed to the intermediate member SA. The mounting member 106 fitted and fixed to the fixed shaft 99 includes a drum motor mounting substrate 95.
Are fixed by screws 96 and 97, and the stator 105 of the drum motor Md is integrally mounted on the drum motor mounting board 95. Also, the upper drum Du
A rotary transformer 23 is fixed to the lower end of the rotary transformer.
The upper drum Du has bearings 93, 94 fixed thereto.
Are fitted on a fixed shaft 99 fixed to the intermediate member SA, and the upper drum Du and the intermediate member SA are fixed to the fixed shaft 9.
9 is used as a common center axis, the rotary transformer 23 on the upper drum Du and the rotary transformer 24 on the intermediate member SA, which rotate integrally with the rotor 92, are located between the two even if the fixed shaft 99 is inclined. The gap will be kept constant.

The intermediate member S which is always coaxially held by the fixed shaft 99 fixed to the intermediate member SA.
A and the upper drum Du are connected to the lower drum D by rotating fulcrum members 30 and 31 provided at two positions on a straight line L3 located near the rotation locus plane of the rotating magnetic heads Ha and Hb.
d is rotatably supported. That is, the pin-shaped pivot support members 30, 31 implanted at the upper end 28a of the intermediate member SA at the position on the straight line L3 are connected to the two through holes 29b provided in the edge 29 of the lower drum Dd. Two pivots are formed by loose fitting. The intermediate member SA and the annular cam member CA are
The urging by the springs 38 to 41 elastically connects and supports the drum base DB. The springs 38 and 39 are inserted into holes 44 and 45 provided in the drum base DB and holes 46 and 47 provided in the intermediate member SA, as shown in FIG.
0, 41, as shown in FIG.
B are inserted into holes 48 and 49 provided in B and holes 101 and 102 provided in the restraining plate 100 attached to the intermediate member SA by screws 107 and 108.

Next, a ninth embodiment of the present invention will be described with reference to FIG. In this embodiment, the intermediate member S
In order to unambiguously determine the rotation center of A (the straight line L3 or the point Oc), the same rotation fulcrum members 30, 31 as used in the fifth embodiment are used, and the lower drum Dd is used. The present embodiment differs from the above-described eighth embodiment in that a fixed shaft 99 is rotatably supported by a formed bearing portion 98. Therefore, the difference will be described below, and the description of the other points will be omitted. FIG.
(A) is a cross-sectional view of the configuration around the drum pair according to the second type described above with reference to FIG.
2 shows a cross section at a position of a -270 degree line. Similarly, FIG.
1 (b) shows a cross section at a 0-180 degree line position in FIG. The lower drum Dd having a guide portion G of the reference edge of the magnetic tape formed on the outer peripheral surface is fixed to the drum base DB by a plurality of screws 32. A fixed shaft 99 that supports the upper drum is fitted and fixed to an intermediate member SA provided in an inner space formed inside the lower drum Dd.

As shown in FIG. 21, the rotor 92 of the drum motor Md is fixed to the upper drum Du by screws 103 and 104. The upper drum Du has bearings 93 and 94.
And is fitted to the fixed shaft 99 via the. Further, a tip 98a of the bearing portion 98 formed on the lower drum Dd is a bearing 94.
The fixed shaft 99 is rotatably supported by abutting the fixed shaft 99 below the fixed shaft 99. The mounting member 106 fitted and fixed to the fixed shaft 99 includes a drum motor mounting substrate 95.
Are fixed by screws 96 and 97, and the stator 105 of the drum motor Md is integrally mounted on the drum motor mounting board 95. Also, the upper drum Du
A rotary transformer 23 is fixed to the lower end of the rotary transformer.
The upper drum Du has bearings 93, 94 fixed thereto.
Are fitted on a fixed shaft 99 fixed to the intermediate member SA, and the upper drum Du and the intermediate member SA are fixed to the fixed shaft 9.
9 is used as a common center axis, the rotary transformer 23 on the upper drum Du and the rotary transformer 24 on the intermediate member SA, which rotate integrally with the rotor 92, are located between the two even if the fixed shaft 99 is inclined. The gap will be kept constant.

Further, the intermediate member SA and the upper drum Du, which are always held coaxially by the fixed shaft 99, are connected to a straight line L located near the rotation locus plane of the rotating magnetic heads Ha, Hb.
3. Rotating fulcrum members 30, 3 provided at two positions above
1 supports the lower drum Dd rotatably. That is, the pin-shaped pivoting fulcrum members 30, 31 implanted at the edge 28c of the intermediate member SA at the position on the straight line L3 are connected to two through holes 29b provided in the edge 29 of the lower drum Dd. Two pivots are formed by loose fitting. Further, the pins 429 and 430 implanted in the intermediate member SA are loosely fitted into the through holes 434 and 435 formed in the lower drum Dd, respectively, and the front ends thereof contact the spacer 436 to support it. I have.
Here, the spacer 436 has a function of adjusting an interval between the rotary transformer 23 attached to the upper drum Du and the rotary transformer 24 attached to the intermediate member SA, and is provided to the bearings 93 and 94. The preload is received on the lower side. And the intermediate member SA
The annular cam member CA is elastically connected to and supported by the drum base DB by the bias of the springs 38 to 41. The springs 38 and 39 are as shown in FIG.
As shown in the figure, holes 4 provided in the drum base DB
4, 45 and the holes 46, 47 provided in the intermediate member SA, and the springs 40, 41 are provided with holes 48, 47 provided in the drum base DB, as shown in FIG.
49 and holes 101 and 102 provided in the restraining plate 100 attached to the intermediate member SA by screws 107 and 108.

Now, the first to ninth embodiments of the magnetic recording / reproducing apparatus according to the present invention described above will
The lower drum Dd on which the guide portion G for guiding the reference edge Te is formed is fixed to the drum base DB, and the upper drum that rotates with the magnetic heads Ha and Hb mounted on the fixed lower drum Dd. By rotating the rotation shaft 1 or the fixed shaft 99 of Du about a predetermined rotation fulcrum, the rotation trajectory surfaces of the rotating magnetic heads Ha and Hb are inclined to rotate with respect to the reference edge Te of the magnetic tape T. Magnetic heads Ha, Hb
3 shows various aspects of a configuration for scanning at a desired angle. In other words, in these embodiments, the magnetic tape T has its reference edge Te always lower drum D
It is assumed that the vehicle travels stably along a certain traveling route along the guide portion G of d.
By performing correction by tilting the rotation trajectory surfaces of the rotary magnetic heads Ha and Hb (hereinafter, sometimes referred to as “track correction”), trick play without noise bars is realized. This premise is sufficiently satisfied when the track width recorded on the magnetic tape T is relatively large, for example, in the SP mode in the above-described VHS system VTR.

However, for example, the aforementioned VHS system VTR
When the track width recorded on the magnetic tape is relatively small, such as 19 μm, as in the EP mode in FIG. May occur, and a sufficient effect may not always be obtained. In order to clarify this phenomenon, the inventors of the present invention have observed the running state of the magnetic tape T around the drum pair DA in detail using an endoscope camera or the like. It has been found that there is a phenomenon that the magnetic tape slightly rises from the guide portion G or is pressed against the guide portion G due to the rotation of the upper drum Du. Therefore, this phenomenon will be described first with reference to FIGS.

FIG. 49A is a diagram showing the running state of the magnetic tape T during normal reproduction. In this state, the center axes of the upper drum Du and the lower drum Dd coincide with each other, the reference edge Te of the magnetic tape T runs along the guide portion G of the lower drum Dd, and the magnetic tape T No phenomenon of floating from the section G or being pressed against the guide section G has occurred. On the other hand, in the running state of the magnetic tape T during the FF reproduction shown in FIG. 3B, as described above, the rotation axis of the upper drum Du is, as shown by the dashed line, the lower drum Dd.
Is rotated clockwise with respect to the center axis Y-Y of the first direction. For this reason, the magnetic tape T is located at the entrance side (supply side guide roller SGR side) with respect to the drum pair DA.
The reference edge Te is pulled by the upper drum Du and tends to be separated from the guide portion G of the lower drum Dd. On the other hand, on the exit side (take-up side guide roller TGR side) with respect to the drum pair DA, the upper drum Du tends to press the magnetic tape T against the guide portion G of the lower drum Dd. Is inclined at a slight angle (θ2) with respect to the guide portion G of the lower drum Dd. Therefore, even if track correction is performed by inclining the upper drum Du with respect to the lower drum Dd by an angle (θ1) corresponding to FF reproduction at a predetermined speed, the rotating magnetic heads Ha,
The rotation locus plane of Hb cannot accurately trace the track pattern of the magnetic tape T.

As a method for solving this problem, a method of two corrections (hereinafter, these may be referred to as “read correction” in some cases) shown in FIGS. That is, in the method shown in FIG. 9C, the entire drum pair DA is further inclined by (θ2) while the relative angle (θ1) between the upper drum Du and the lower drum Dd is kept constant, and the magnetic tape T Is a method of making the guide portion G of the lower drum Dd along the reference edge Te. As will be described later in detail in a fourteenth embodiment, this method may be modified in such a manner that a guide portion for guiding the reference edge Te of the magnetic tape is formed separately from the lower drum Dd. is there.

On the other hand, in the method shown in FIG. 11D, the supply side guide roller SGR and the take-up side guide roller TGR are each configured to be displaceable in the width direction of the magnetic tape T. During FF reproduction, the supply-side guide roller is displaced downward as shown in the figure,
This is a method in which the take-up side guide roller TGR is displaced upward to correct the traveling path of the magnetic tape so as to follow the guide portion G of the lower drum Dd. Note that the above description is based on the case where the magnetic tape T
The same applies to FIG. 50 except that the direction of the tilt that occurs in, and the direction in which the related member should be operated for lead correction are reversed.

Next, the relationship between the read correction and the track correction described with reference to FIG. 49C or FIG. 50C and the principle thereof will be described in more detail with reference to FIG. FIGS. 22A and 22B are schematic diagrams each illustrating a side surface of the drum pair DA viewed from the direction of 90 degrees in FIG.
FIG. 7A is a diagram for explaining the state of track correction and the state of read correction during FB reproduction, and FIG. Here, the straight line YY is a straight line corresponding to the straight line YY in FIG. 3, FIG. 49, FIG. 50, and the like. It shows the direction of.

In the FF reproduction, as shown in FIG. 15A, the upper drum Du is in relation to the lower drum Dd by a straight line L3 passing through the point Oc and perpendicular to the paper surface (the drum pair in the first to ninth embodiments). (See each sectional view of DA), the track correction is performed by rotating clockwise by an angle θ1. Furthermore, the upper drum Du and the lower drum Dd are integrated,
The lead is corrected by being rotated by an angle θ2 around a straight line (parallel to the straight line L3) passing through the point Oc ′ and perpendicular to the paper surface. That is, by the track correction and the read correction, the final inclination angle θ of the center axis of the upper drum Du with respect to the straight line YY has a relation of θ = θ1 + θ2. Here, the position of the point Oc is determined by the rotating magnetic head H
As described above, it is necessary to provide the magnetic tapes in the vicinity of the rotation trajectory surfaces of the rotary magnetic heads Ha and Hb in order to maintain a good contact state between the magnetic tapes a and Hb.
Such is not always necessary for the position of c '.
It should be noted that, in the case of FB reproduction, since the operation principle is clear with reference to FIG.

Hereinafter, a specific configuration of a magnetic recording / reproducing apparatus employing the above-described track correction and read correction will be described with reference to tenth to fifteenth embodiments. First, a tenth embodiment of the present invention will be described with reference to FIGS. FIG. 23A is a cross-sectional view showing a configuration around a pair of drums, and FIG. The cross section at the -180 degree line position is shown. FIG. 24 shows a cross section at another angle different from FIGS. 23 (a) and 23 (b). FIG. 27 is a side cross-sectional view for explaining the operation of the present embodiment, and shows a cross section at a 0-180 degree line position in FIG.

The upper drum Du is fixed to the upper drum fixing member 2 fixed to the rotating shaft 1 of the drum motor Md by screws 3 and 4. So, the drum motor Md
Are rotated at a predetermined rotation speed, the rotating magnetic heads Ha and Hb fixed to the upper drum Du are integrated with the rotating shaft 1 rotatably supported by bearings 5 and 6 attached to the intermediate member SA. Rotate. 23 is a rotary transformer fixed to the upper drum fixing member 2, and 24 is a rotary transformer attached to the intermediate member SA. The intermediate member SA includes a stator 10 of the drum motor Md.
5 is fixed by screws 12 and 13, and the rotor 92 is fixed to the shaft fixing member 11 fixed to the rotating shaft 1 by screws 9 and 10. The drum motor Md shown in the figure has a coil 105 on its stator 105 and a permanent magnet 14 on its rotor 92.

The intermediate member SA is provided in such a manner that the upper portion thereof is located in the inner space of the lower drum Dd, but the upper end 28a of the intermediate member SA and the fixed drum Dd are provided.
90 degrees -27 of drum pair DA with edge 29 of
In the direction of 0 degrees, the same members 30 and 31 for rotation fulcrum as described with reference to FIG. 5 or FIG. 20 are provided. Further, the intermediate member SA is provided with an edge portion 28 protruding from the upper end of the outer peripheral surface, and the tip of the edge portion 28 is fitted to the inner peripheral surface of the lower drum Dd with a predetermined slight clearance. That is, the edge 28 of the intermediate member SA is
The outer diameter is configured to have a diameter slightly smaller than the inner diameter of the inner space of the lower drum Dd. Also,
The upper surface of the base plate BP fixed to the lower end of the lower drum Dd by screws 32 (FIG. 24) and the intermediate member S
A springs 38 and 39 are mounted between the lower surface side of the base plate A and the drum motor Md integrally connected and fixed to the lower surface side of the base plate BP and the intermediate member SA.
Between the drum motor mounting board 7 and the spring 4
0, 41 are mounted. FIG. 26 is a perspective view of the base plate BP when viewed from the back side, and FIG. 25 is a perspective view of the base plate BP viewed from the front side.

As shown in FIG. 24, the leaf spring 24 is fixed to the base plate BP by screws 240 and 241.
25 (the entire shape of the leaf spring 242 is shown in FIG. 25), and the base plate BP is formed by pressing the distal end of the leaf spring 242 against the lower surface of the drum base DB. It is in a state where it can be slightly displaced up and down with respect to the base DB. Further, the positioning of the base plate BP with respect to the drum base DB is performed by loosely fitting positioning pins 243 and 244 provided on the drum base DB with respect to the drum pair DA in the 0 ° -180 ° direction into holes provided in the base plate BP. (See FIG. 23B).

The upper surface of the base plate BP and the intermediate member S
An annular cam member CA for adjusting the inclination of the rotary shaft 1 is provided between the lower drum A and the lower surface of the drum base DB. An annular cam member CRA (hereinafter, simply referred to as "annular cam member CRA") for adjusting the inclination, which functions as an inclination adjusting means for the central axis of Dd, is provided. The positioning of the annular cam member CRA with respect to the drum base DB is as follows.
Positioning pins 245 and 246 (see FIGS. 23A and 25) provided on the drum base DB in the directions of 90 degrees and 270 degrees in the drum pair DA are connected to the annular cam member CRA.
This is done by contacting the inner peripheral edge of the.

The cam followers 36 and 37 projecting from the intermediate member SA are configured to abut against the cam profiles 258 to 263 formed on the upper surface of the annular cam member CA. That is, when the annular cam member CA is rotated by applying a driving force from a driving source (not shown),
A component portion composed of the upper drum Du, the intermediate member SA, and the drum motor Md supported via the rotary shaft 1 uses a straight line L3 connecting the rotation fulcrum members 30 and 31 as a center axis of rotation. 23B, it is inclined in the left-right direction about the point Oc in the plane of FIG.

The annular cam member CRA provided between the lower surface of the base plate BP and the upper surface of the drum base DB has a cam profile 2 formed on the upper surface thereof.
The cam followers 247 and 248 projecting from the base plate BP are configured to abut against 51 to 256. Further, fulcrum plane portions 238 and 239 are formed on the annular cam member CRA, and the fulcrum plane portions 238 and 239 abut against fulcrum projections 249 and 250 projecting from the rear surface of the base plate BP. It is configured to touch. That is, when the annular cam member CRA is rotated by applying a driving force from a driving source (not shown), the lower drum Dd fixed to the base plate BP is connected to a straight line connecting the fulcrum projections 249 and 250. With L5 as the center axis of rotation, the drum base DB
On the other hand, it tilts in the left-right direction about the point Oc ′ in the plane of FIG.

FIG. 25 is an exploded perspective view showing a drum base DB, an annular cam member CRA, a base plate BP, and an annular cam member CA, which are disassembled in the order in which they are stacked. The annular cam member CRA has its bottom surface rotatably mounted on the upper surface of the drum base DB.
On its upper surface, cam profiles 251 to 256 engaging with cam followers 247 and 248 provided on the back side of the base plate BP, and fulcrum projections 249 projecting from the back side of the base plate BP. , 250 and fulcrum plane portions 238 and 239 are formed.
The fulcrum flat portions 238 and 239 are provided on the drum base D on which the annular cam member CRA is mounted in a state where the annular cam member CRA is mounted on the drum base DB.
It is configured so that the height from the plane B is the same. Further, the annular cam member CA is rotatably guided by fitting into a guide groove 257 formed on the upper surface side of the base plate BP. Reference numeral 264 denotes a connecting portion, and a gear 265 is provided at a distal end portion.

Power is supplied to the gear 265 from a drive source (not shown) via a pinion (not shown), and the annular cam member CA is rotated in the guide groove 57 on the upper surface side of the base plate BP. Then, the cam followers 36 and 37 protruding from the intermediate member SA are sequentially different from the cam profiles 258 to 2 formed on the annular cam member CA.
The rotary shaft 1 rotatably supported by bearings 5 and 6 attached to the intermediate member SA so as to abut on the shaft 63.
Can be inclined, so that the upper drum Du, the intermediate member SA, and the drum motor Md are integrally formed at a predetermined angle with respect to the center axis of the lower drum Dd by 0 ° -180 degrees with respect to the center axis of the lower drum Dd. It can be made to incline in the direction of degrees (the left-right direction on the paper surface in FIG. 23B).

Guide groove 25 on the upper surface side of base plate BP
7 is provided with a notch 257a and through holes 257b, 257c, and these notch 257a, through holes 257b,
Pins 266 to 268 for connecting the annular cam member CRA and the annular cam member CA can pass through the portion 257c. And these pins 26
6 to 268 are press-fitted into holes 269 to 271 formed in the annular cam member CA at one end thereof. These pins 266 to 268 pass through the notch 257a and the through holes 257b and 257c provided in the guide groove 257 on the upper surface side of the base plate BP, respectively, and are provided on the annular cam member CRA. Hole 272
274 are press-fitted at the other end. Note that FIG.
The holes 275 and 276 provided in the base plate BP shown in FIG. 5 and the holes 277 and 278 provided in the base plate BP shown in FIG.
The spring 3 shown in FIGS. 23 (a) and 23 (b)
8, 39, 40, and 41 are holes to be mounted respectively.

The arc-shaped members indicated by 279 to 281 in FIG. 26 have outer peripheral wall surfaces 279a and 280, respectively.
The position of the inner peripheral wall surface 282 in the annular cam member CRA is regulated by a and 281a. As mentioned above,
An annular cam member CA provided on the upper surface side of the base plate BP and used for adjusting the inclination of the rotating shaft 1, and an annular cam member CA provided on the lower surface side of the base plate BP for adjusting the inclination of the central axis of the lower drum Dd. Are connected to each other by pins 266 to 268. Thus, power is supplied from a driving source (not shown) to the gear 265 provided on the annular cam member CA, and the annular cam member CA is rotated in the guide groove 257 on the upper surface side of the base plate BP. When it is moved, the annular cam member CRA is simultaneously placed on the upper surface of the drum base DB,
Since the rotation is guided by the outer peripheral surfaces of the arc-shaped members 279 to 281, it is possible to drive both the annular cam member CA and the annular cam member CRA in conjunction with the power from one drive source. Therefore, the configuration of the drive mechanism can be simplified. The annular cam member CA used for adjusting the inclination of the rotary shaft 1 and the annular cam member C used for adjusting the inclination of the center axis of the lower drum Dd.
It is needless to say that the RA and the RA may be separately driven by individual driving sources.

Next, the states of the annular cam member CA and the annular cam member CRA when the magnetic recording / reproducing apparatus according to the present embodiment is operating in each reproduction mode will be described. When operating in the normal reproduction mode, the cam follower 36 and the cam follower 37 projecting from the intermediate member SA come into contact with the cam contour 262 and the cam contour 259 of the annular cam member CA, respectively. I have. On the other hand, the cam follower 247 and the cam follower 248 projecting from the base plate BP form the cam profile 255 of the annular cam member CRA.
And the cam contour 252. The cam profiles 259 and 262 of the annular cam member CA are configured to have the same height, and the cam profiles 255 and 252 of the annular cam member CRA have the same height as the fulcrum plane portions 238 and 239. When the magnetic recording / reproducing apparatus is operating in the normal reproduction mode,
The center axes of the upper drum Du and the lower drum Dd are aligned. Therefore, in this operation state, the magnetic tape T has its reference edge Te correctly abutting over the entire area of the guide portion G formed on the outer peripheral portion of the lower drum Dd,
The vehicle travels at a predetermined traveling speed while being stably held at the normal position, and a reproduction signal indicating an envelope in a good state is obtained as illustrated in, for example, FIG.

Next, when operating in the FF reproduction mode, the cam follower 36 and the cam follower 37 projecting from the intermediate member SA form the cam profile 26 of the annular cam member CA.
1 and the cam profile 258, respectively. The cam profile 261 of the annular cam member CA is the cam profile 2
58, the center axis (rotation axis 1) of the upper drum Du and the intermediate member SA is
As shown in FIG. 27A, the track correction is performed with the lower drum Dd inclined rightward.

At this time, the annular cam member CA and the pin 2
Annular cam members C connected by 66-268
The cam contour 254 and the cam contour 251 in RA include:
A cam follower 247 and a cam follower 248 projecting from a base plate BP fixed to the lower drum Dd are in contact with each other.

The cam profile 254 of the annular cam member CRA is configured to be higher than the cam profile 251 and the fulcrum plane portion 23 of the annular cam member CRA is formed.
Since the fulcrum projections 249 and 250 protruding from the base plate BP are in contact with the lower and upper drums 8 and 239, the lower drum Dd to which the base plate BP is fixed is fixed to the fulcrum projections 249 and 250. Is inclined by an angle corresponding to the difference between the heights of the two cam profiles 254 and 251 with the straight line L5 connecting the two as the central axis of rotation. As a result, the central axis of the lower drum Dd is inclined by a predetermined slight angle in the direction of inclination of the central axes of the upper drum Du and the intermediate member SA to perform lead correction, and the magnetic tape T has its reference edge Te. This makes it possible to travel at a predetermined traveling speed in a state in which it is correctly contacted over the entire area of the guide portion G formed on the outer peripheral portion of the lower drum Dd, and is stably held at a regular position.

Next, when operating in the FB reproduction mode, the cam follower 36 and the cam follower 37 projecting from the intermediate member SA form the cam profile 26 of the annular cam member CA.
3 and the cam contour 260 respectively. The cam profile 263 of the annular cam member CA is the cam profile 2
60, the center axis (rotation axis 1) of the upper drum Du and the intermediate member SA is
As shown in FIG. 27B, the track correction is performed with the lower drum Dd inclined leftward.

At this time, the annular cam member CA and the pin 2
Annular cam members C connected by 66-268
The cam contour 256 and the cam contour 253 in RA include:
A cam follower 247 and a cam follower 248 projecting from a base plate BP fixed to the lower drum Dd are in contact with each other.

The cam profile 256 of the annular cam member CRA is configured to be lower than the cam profile 253,
And the fulcrum plane portion 238, 2 of the annular cam member CRA.
39, the lower drum Dd to which the base plate BP is fixed because the fulcrum projections 249 and 250 projecting from the base plate BP are in contact with each other.
Is inclined by an angle corresponding to the height difference between the two cam profiles 256 and 253 with the straight line L5 connecting the fulcrum projections 249 and 250 as the center axis of rotation. As a result, the central axis of the lower drum Dd is inclined by a predetermined slight angle in the direction of inclination of the central axes of the upper drum Du and the intermediate member SA to perform lead correction, and the magnetic tape T has its reference edge Te. This makes it possible to travel at a predetermined traveling speed in a state in which it is correctly contacted over the entire area of the guide portion G formed on the outer peripheral portion of the lower drum Dd, and is stably held at a regular position.

Next, an eleventh embodiment of the present invention will be described with reference to FIGS. In this embodiment,
In the method of suspending the intermediate member SA with respect to the lower drum Dd and in the form of an annular cam member used to rotate the intermediate member SA and the lower drum Dd, the tenth aspect described above is used.
This is different from the embodiment, and the other points are substantially the same. Therefore, these differences will be described below. FIG. 28A is a cross-sectional view showing the configuration around the pair of drums, and FIG. 28B is a cross-sectional view taken along a line 90 ° -270 ° in FIG. -180
The cross section at the parallel line position is shown. FIG. 29 shows a cross section at another angle different from FIGS. 28 (a) and 28 (b). FIG. 30 is an exploded perspective view of a main part around the drum pair. FIG. 31 is a side cross-sectional view for explaining the operation of the present embodiment, and shows a cross section at a 0-180 degree line position in FIG.

The upper drum Du is fixed to the rotating shaft 1 of the drum motor Md via an upper drum fixing member 2, and the rotating shaft 1 is rotatably provided on the intermediate member SA via bearings 5 and 6. Are the same as those described in the first embodiment and the first embodiment.
This is the same as in the zeroth embodiment. In this embodiment, the intermediate member SA
Is suspended by a ring-shaped leaf spring 300 with respect to the lower drum Dd. This ring-shaped leaf spring 300 is shown in FIG.
As shown in FIG. 0, the inner ring portion 300a and the outer ring portion 300b are concentric with each other, and both have a shape connected by connecting portions 304a and 304b at two points on the diameter. Also, the connecting portions 304a, 30
4b are holes 301a, 301b and holes 302a, 302b.
Are provided respectively, and positioning holes 303a, 303b are further provided in the inner ring portion 300a and the outer ring portion 300b.
Is provided.

On the other hand, on the upper end surface 305 of the intermediate member SA,
Screw holes 305a and 305b are provided at positions corresponding to the holes 302a and 302b of the ring-shaped leaf spring 300, and at positions corresponding to the positioning holes 303a,
A positioning pin 305c is implanted. Further, a ring-shaped leaf spring 30 is provided on the upper end surface 305 of the intermediate member SA.
A rib 305d that fits with the inner periphery of the 0 inner ring portion 300a is provided. On the other hand, in the step portion 306 of the lower drum Dd,
Screw holes 306a and 306b are provided at positions corresponding to the holes 301a and 301b of the ring-shaped leaf spring 300, and positioning pins 306c are implanted at positions corresponding to the positioning holes 303b. Further, a wall surface 307 is formed on the step portion 306 of the lower drum Dd so as to fit with the outer periphery of the outer ring portion 300b of the ring-shaped leaf spring 300.

Therefore, the intermediate member S with respect to the lower drum Dd
A is mounted as follows. First, with the positioning hole 303a of the ring-shaped leaf spring 300 aligned with the positioning pin 305c of the intermediate member SA, the inner ring portion 300a is fitted to the rib 305d of the intermediate member SA, and the ring-shaped leaf spring 300 is inserted into the intermediate member SA. Are fastened with screws 308a and 308b. Next, the positioning hole 3 of the ring-shaped leaf spring 300
03b is aligned with the positioning pin 306c of the lower drum Dd, and the outer diameter of the outer ring portion 300b is adjusted to the wall surface 3 of the lower drum Dd.
07, and the ring-shaped leaf spring 300 is attached to the lower drum Dd.
Then, it is fastened and fixed with screws 309a and 309b. In addition, the connection part 304a, 3 of the inner ring part 300a and the outer ring part 300b.
Numeral 04b is arranged on the straight line L3 in FIG. 28 (a), and the intermediate member SA with respect to the lower drum Dd.
Constitute a pivot point for the rotation.

As described above, in this embodiment, the intermediate member SA is suspended from the lower drum Dd by using the ring-shaped leaf spring 300.
d, there is no direct fitting relationship with contact (for example, see the first embodiment, the tenth embodiment, etc.), so that the intermediate member SA
It is possible to drive smoothly without causing uneven load due to friction at the time of turning. Further, in the first embodiment, the tenth embodiment, and the like described above, in order to form the rotation fulcrum of the intermediate member SA with respect to the lower drum Dd, each small diameter portion 30a of the rotation fulcrum members 30, 31 is formed. , 31
a was loosely fitted into each of the two through holes 29b of the lower drum Dd. In such a configuration, each of the small diameter portions 30a, 31
a and clearance between the lower drum Dd and the intermediate member SA are inevitably required.
This had to tolerate some backlash between them, which contributed to the increase in jitter. However, according to the configuration of the present embodiment, it is apparent that essentially no such play is caused.

Next, the form and operation of the annular cam member used to rotate the intermediate member SA and the lower drum Dd around the straight line L3 (point Oc) and the straight line L5 (point Oc ') will be described. I do. The annular cam member CA has a ring shape, a gear 311 is formed on an outer peripheral surface thereof, and a cam profile 312 which is an inclined surface is formed on the surface thereof.
a, 312c, 313a, 313c and planar cam profiles 312b, 313b are formed. The annular cam member CA has an inner diameter of the drum base DB.
And is rotatably driven by a motor (not shown) while being fitted to the outer diameter of the annular convex portion 314 formed on the surface of the.

On the other hand, on the surface of the annular convex portion 314 provided on the drum base DB, colored pins 315a and 315b are implanted on a straight line L5 (see FIG. 28A). Holes 316a, 316 formed in drum Dd
b and loosely fit together to form a rotation fulcrum of the lower drum Dd. Further, a compression spring 319 is provided between the lower drum Dd and the mounting board 7 of the drum motor Md.
A clockwise couple is applied to the middle and lower drums Dd by the intermediate member SA.
Are provided with counterclockwise couples, respectively. on the other hand,
A leaf spring 242 is provided on the bottom surface of the lower drum Dd, and elastically supports the lower drum Dd with respect to the drum base DB.

The annular cam member CA has its cam contours 313a, 313b, 313c abutting on a cam follower 317 provided on the bottom surface of the lower drum Dd, while the cam contours 312a, 312b, 312c are in contact with the lower drum Dd. It contacts the cam follower 318 provided on the bottom surface of the intermediate member SA through the opening 310 provided on the bottom surface of Dd. Here, the cam follower 318 of the intermediate member SA and the cam follower 317 of the lower drum Dd are provided at positions 180 degrees apart in the rotational direction of the annular cam member CA, as shown in FIG. And are configured to abut against the cam contours 312a, 312b, 312c and the cam contours 313a, 313b, 313c, respectively. That is, when the magnetic recording / reproducing apparatus of the present embodiment is in the normal reproduction mode, the cam follower 318 of the intermediate member SA comes into contact with the planar cam contour 312b, and the cam follower 317 of the lower drum Dd.
Is in contact with the planar cam profile 313b. Here, since the cam profile 312b and the cam profile 313b are configured at the same height, both the intermediate member SA and the lower drum Dd are supported in parallel with the drum base DB.

The magnetic recording / reproducing apparatus of this embodiment is
When in the F regeneration mode, the cam follower 3 of the intermediate member SA
18 is in contact with the cam profile 312a of the sloped shape, and the cam follower 317 of the lower drum Dd is the cam profile 31 of the sloped shape.
3a. Here, the intermediate member SA is
Since the cam follower 318 is pressed by the cam profile 312a which forms a higher surface than the cam profile 312b,
By the action of the compression spring 319 and the leaf spring 242,
By rotating clockwise as shown in FIG. 31A, track correction is performed. On the other hand, in the lower drum Dd, the cam follower 317 abuts against the cam profile 313a forming a lower surface than the cam profile 313b.
By rotating clockwise as shown in FIG. 7A, lead correction is performed.

Further, when the magnetic recording / reproducing apparatus of the present embodiment is in the FB reproducing mode, the cam follower 318 of the intermediate member SA comes into contact with the cam profile 312c having the inclined shape,
The cam follower 317 of the lower drum Dd comes into contact with the inclined cam profile 313c. Here, the intermediate member S
A is pressed counterclockwise by the action of the compression spring 319 and the leaf spring 242 because the cam follower 318 is pressed by the cam profile 312c which is lower than the cam profile 312b, as shown in FIG. Turn to
Track correction will be performed. On the other hand, lower drum D
31D, the cam follower 317 abuts on a cam profile 313c that forms a surface higher than the cam profile 313b, and therefore, in the counterclockwise direction as shown in FIG. 31B by the action of the compression spring 319 and the leaf spring 242. By rotating, lead correction is performed.

In this embodiment, a ring-shaped leaf spring 300 is used to suspend the intermediate member SA with respect to the lower drum Dd.
However, this leaf spring does not necessarily have to be ring-shaped. For example, as shown in FIG. 32, a pair of leaf springs 321 and 322 having a shape like a cutout of a ring-shaped leaf spring 300 may be used. That is, the intermediate member SA and the lower drum Dd are coaxially supported by any method such as using a jig, and the hole 321a of the leaf spring 321 is inserted into the screw hole 323a of the intermediate member SA, and the hole 32 of the leaf spring 322 is inserted.
2a is screwed into the screw hole 324a of the intermediate member SA, and the hole 321b of the leaf spring 321 is screwed into the screw hole 323a of the lower drum Dd, and the hole 322b of the leaf spring 322.
May be screwed and fixed to the screw holes 326b of the lower drum Dd.

Next, a twelfth embodiment of the present invention will be described with reference to FIGS. In this embodiment,
The eleventh embodiment is applied to a magnetic recording / reproducing apparatus (see the eighth and ninth embodiments) in which the rotor of the drum motor Md is directly attached to the upper drum Du to rotate and drive the upper drum Du and the shaft itself does not rotate. This is an example in which the suspension method using a leaf spring adopted in the example is applied, and the lower drum Dd also rotates to perform lead correction.

FIG. 33 (a) is a cross-sectional view showing the configuration around the drum pair. FIG. 33 (b) is a cross-sectional view taken along the line of 90 ° -270 ° in FIG. 0 degrees of
The cross section at the 180-degree line position is shown. FIG.
FIG. 3 is an exploded perspective view of a main part around a pair of drums. FIG. 35 is a side sectional view for explaining the operation of this embodiment.
FIG. 3 shows a cross section at a 0-180 degree line position in FIG. 2. In this embodiment, the intermediate member SA is suspended by the ring-shaped leaf spring 400 near the fixed shaft 99 with respect to the lower drum Dd. This ring-shaped leaf spring 400 is
Leaf spring 30 described in one embodiment with reference to FIG.
Although it is smaller than 0, its shape is almost similar. Accordingly, corresponding parts are denoted by reference numerals with the hundreds digit changed from 3 to 4, and detailed description thereof is omitted.

The hole 402 of the ring-shaped leaf spring 400 is provided on the upper end surface 405 of the intermediate member SA into which the fixed shaft 99 is press-fitted.
screw holes 405a, 405 at positions corresponding to
b are provided, and positioning pins 405c are implanted at positions corresponding to the positioning holes 403a. On the other hand, the stepped portion 406 of the lower drum Dd is provided with screw holes 406a and 406b at positions corresponding to the holes 401a and 401b of the ring-shaped leaf spring 400, and is provided with a positioning at a position corresponding to the positioning hole 403b. A pin 406c is implanted. Further, a wall surface 407 is formed on the step portion 406 of the lower drum Dd so as to fit with the outer periphery of the outer ring portion 400b of the ring-shaped leaf spring 400.

Therefore, the intermediate member S with respect to the lower drum Dd
A is mounted as follows. First, the outer periphery of the outer ring portion 400b is fitted to the wall surface 407 of the lower drum Dd with the positioning holes 403a of the ring-shaped leaf spring 400 aligned with the positioning pins 406c of the lower drum Dd.
A ring-shaped leaf spring 400 with screws 409a and 409b.
To conclude. Next, the intermediate member S into which the fixed shaft 99 is press-fitted.
A is inserted from below the lower drum Dd by fitting the ring-shaped leaf spring 400 to the inner diameter of the inner ring portion 400a, and aligning the positioning hole 403a of the ring-shaped leaf spring 400 with the positioning pin 405c of the intermediate member SA. Then, the ring-shaped leaf spring 400 is fastened and fixed to the intermediate member SA with the screws 408a and 408b. In this state, the rotary transformer mounting portions 416a and 416b provided on the intermediate member SA
d protrudes from the through holes 410a and 410b provided in the bottom surface of the lower drum Dd, where the rotary transformer 24 is mounted. The connecting portions 404a and 404b between the inner ring portion 400a and the outer ring portion 400b are shown in FIG.
In (a), it is arranged on the straight line L3, and constitutes a rotation fulcrum of the intermediate member SA with respect to the lower drum Dd, as in the case of the eleventh embodiment described above.

As described above, in this embodiment, the intermediate member SA is suspended from the lower drum Dd by using the ring-shaped leaf spring 400.
There is no direct mating relationship (for example, see the first embodiment, the tenth embodiment, etc.) with contact between the intermediate member SA and the intermediate member SA. It becomes possible to drive.

Next, the form and operation of the annular cam member used to rotate the intermediate member SA and the lower drum Dd around the straight line L3 (point Oc) and the straight line L5 (point Oc ') will be described. I do. The annular cam member CA has a ring shape, a gear 411 is formed on a part of the inner peripheral surface thereof, and a cam profile 4 having an inclined surface is formed on the surface thereof.
12a, 412c, 413a, 413c and planar cam profiles 412b, 413b are formed. The outer diameter of the annular cam member CA is fitted to the inner diameter of an annular recess 419 formed on the surface of the drum base DB, and the cam member CA is rotated by a motor (not shown).

On the other hand, on the surface of the annular convex portion 414 provided on the drum base DB, colored pins 415a and 415b are implanted on the straight line L5 (see FIG. 33 (a)). Holes 420a, 420 formed in drum Dd
b and loosely fit together to form a rotation fulcrum of the lower drum Dd. A compression spring 421 is provided between the lower drum Dd and the drum base DB. The compression spring 421 is connected to the lower drum D in FIG.
A counterclockwise couple is applied to d. Furthermore, a compression spring 422 is provided between the restraining plate 100 provided on the bottom surface of the intermediate member SA and the drum base DB, and this compression spring 422 is connected to the intermediate member SA in FIG. A counterclockwise couple is applied. On the other hand,
Bosses 417a projecting from the bottom surface of the lower drum Dd and projecting downward from the through holes 418a and 418b of the intermediate member SA,
417b is provided with leaf springs 423a and 423b, respectively, and elastically supports the lower drum Dd with respect to the drum base DB. Note that 450a and 450b are height determining pins that are planted on the bottom surface of the lower drum Dd and maintain a constant interval between the intermediate member SA and the lower drum Dd in a 90-270 degree cross section. Height determining pin 450a,
The tip 450b has an arc shape having a center of curvature on the straight line L3, and slides on the surface 451 of the intermediate member SA when the upper drum Du and the intermediate member SA rotate to perform track correction. And keep the distance between them constant.

The annular cam member CA has its cam profiles 413a, 413b, 413c abutting on a cam follower 424 provided on the bottom surface of the lower drum Dd, while the cam profiles 412a, 412b, 412c are formed by intermediate members. It comes into contact with a cam follower 425 provided on the bottom surface of the SA. here,
As shown in FIG. 33B, the cam follower 425 of the intermediate member SA and the cam follower 424 of the lower drum Dd are provided at positions 180 degrees apart in the rotation direction of the annular cam member CA. And the cam contours 412a, 412b, 412c and the cam contours 413a, 413b, 413c, respectively. That is, when the magnetic recording and reproducing apparatus of the present embodiment is in the normal reproducing mode,
The cam follower 425 of the intermediate member SA comes into contact with the planar cam profile 412b, and the cam follower 424 of the lower drum Dd.
Is in contact with the planar cam profile 413b. As a result, both the intermediate member SA and the lower drum Dd are supported in parallel with the drum base DB.

The magnetic recording / reproducing apparatus of this embodiment is
When in the F regeneration mode, the cam follower 4 of the intermediate member SA
25 abuts against the cam profile 412a having a sloped shape, and the cam follower 424 of the lower drum Dd has a cam profile 41 having a sloped shape.
3a. Here, the intermediate member SA is
Since the cam follower 425 is pressed by the cam profile 412a which is higher than the cam profile 412b,
By the action of the compression spring 422 and the leaf springs 423a and 423b, the track is rotated clockwise as shown in FIG. Further, the lower drum Dd also has the compression follower 424 and the leaf springs 423a, 423 because the cam follower 424 abuts against the cam contour 413a constituting a surface higher than the cam contour 413b.
By the action of b, the lead is rotated clockwise as shown in FIG. 35A, and the lead correction is performed.

Further, when the magnetic recording / reproducing apparatus of the present embodiment is in the FB reproducing mode, the cam follower 425 of the intermediate member SA comes into contact with the cam profile 412c having the inclined surface,
The cam follower 424 of the lower drum Dd comes into contact with the cam profile 413c having a slope. Here, the intermediate member S
The compression spring 422 and the leaf springs 423a, 42A are pressed by the cam follower 425, which is pressed by the cam profile 412c that forms a lower surface than the cam profile 412b.
By the action of 3b, the track is rotated counterclockwise as shown in FIG. 35 (b), and the track is corrected. The lower drum Dd also has a compression spring 421 and a leaf spring 423 because the cam follower 424 abuts against a cam profile 413c that forms a lower surface than the cam profile 413b.
By the action of a and 423b, the lead is rotated counterclockwise as shown in FIG. 35B, and the lead correction is performed.

In this embodiment, a ring-shaped leaf spring 400 is used to suspend the intermediate member SA with respect to the lower drum Dd.
However, this leaf spring does not necessarily have to be ring-shaped, and a pair of leaf springs 426, 427 as shown in FIG.
May be used as in the case of the eleventh embodiment described above. Therefore, this is only shown in the drawings and the description is omitted.

Next, a thirteenth embodiment of the present invention will be described with reference to FIGS. In this embodiment,
This is an example in which the rotation fulcrum of the intermediate member SA with respect to the lower drum Dd in the ninth embodiment described above is provided on the inner diameter side near the fixed shaft 99, and the lower drum Dd also rotates to perform lead correction. From a different point of view, this embodiment is different from the above-described twelfth embodiment in that the intermediate member SA is coaxially suspended with respect to the lower drum Dd, and the intermediate member SA is coaxially suspended with respect to the lower drum Dd. The only difference is in the configuration of the rotation fulcrum, and the other points are the same as in the twelfth embodiment. Therefore, hereinafter, the suspension method and the configuration method of the rotation fulcrum which are different from the twelfth embodiment will be described, and the description of the other points will be omitted. FIG.
FIG. 7A is a cross-sectional view illustrating a configuration around the drum pair.
Similarly, FIG. 37 (b) shows a cross section at a 90 ° -270 ° line position in FIG. 2 and a cross section at a 0 ° -180 ° line position in FIG. FIG. 38 is an exploded perspective view of a main part around the drum pair. FIG. 39 is a side cross-sectional view for explaining the operation of the present embodiment.
The cross section at the 0 degree line position is shown.

The fixed shaft 99 is press-fitted into the intermediate member SA.
The fact that the upper drum Du is rotatably supported on the fixed shaft 99 via the bearings 93 and 94, etc.
This is the same as the embodiment. Here, two rotation supporting members 30 and 3 are provided on the upper end surface 405 near the center axis of the intermediate member SA.
1 (see FIG. 5 (h) or FIG. 20 (h)), and pins 429 and 430 are provided on a straight line L4 which is orthogonal to a straight line L3 connecting these two rotating fulcrum members 30 and 31. It has been planted.

On the other hand, through holes 432 to 435 are formed around the bearing portion 431 of the lower drum Dd. And
Rotating fulcrum members 30, 31 implanted in intermediate member SA
Are loosely fitted to the through holes 432 and 433, respectively, to form a rotation fulcrum of the intermediate member SA with respect to the lower drum Dd.
36 and is supported. Also, the intermediate member S
Pins 429 and 430 implanted in A have through holes 434 and
435, each of which is loosely fitted, and the tip of which abuts against and supports a spacer 436, similarly to the pivot support members 30 and 31. Here, the spacer 436 has a function of adjusting an interval between the rotary transformer 23 attached to the upper drum Du and the rotary transformer 24 attached to the intermediate member SA, and is provided to the bearings 93 and 94. The preload is received on the lower side.

As shown in FIGS. 37 (a) and 37 (b), the bearing portion 431 of the lower drum Dd has an R-shaped cross section so that the bearing portion 431 slightly contacts the fixed shaft 99 in a line contact state. By fitting with clearance, the lower drum Dd
37c of the intermediate member SA in FIG.
The rotation around the (straight line L3) is allowed, and the coaxial relationship in FIG. 37A between the lower drum Dd and the intermediate member SA (that is, the upper drum Du) is maintained. On the other hand, bosses 417a and 417b projecting from the bottom surface of the lower drum Dd and projecting downward from the through holes 418a and 418b of the intermediate member SA have leaf springs 423a and 423, respectively.
b; 428a and 428b are provided respectively. The leaf springs 423a and 423b urge the lower drum Dd toward the drum base DB and the leaf springs 423a and 423b.
8a and 428b elastically support the lower drum Dd and the intermediate member SA with respect to the drum base DB by urging the intermediate member SA toward the bottom surface of the lower drum Dd.

In this embodiment, since the lower drum Dd is fitted to the fixed shaft 99 which enables extremely high-precision machining, it is easy to obtain a good fitting state, and the intermediate member is used. During rotation of the SA, load unevenness due to friction is small, so that a smooth rotation operation is realized.
Furthermore, since both the fitting portion and the rotation fulcrum are arranged on the inner diameter side, the outer diameter of the lower drum Dd, which forms the sliding contact surface with the magnetic tape T, can be made thinner. Can be increased in diameter, and multi-channeling is possible.

Next, a fourteenth embodiment of the present invention will be described with reference to FIGS. In the tenth to thirteenth embodiments described above, while the track is corrected by rotating the upper drum Du, the lower drum Dd integrally formed with the guide portion G for guiding the magnetic tape T is rotated. The lead correction is performed by moving the guide portion G along the reference edge Te of the magnetic tape T. On the other hand, in this embodiment, the upper drum Du and the lower drum Dd rotate integrally to perform track correction, and are provided separately from the lower drum Dd to guide the reference edge Te of the magnetic tape T. The lead correction is performed by rotating the guide portion GA. Therefore, this point will be described below, and the description of the other points will be omitted.

FIG. 40 (a) is a cross-sectional view showing the structure around the drum pair. FIG. 40 (b) is a cross-sectional view taken along the line 90 ° -270 ° in FIG. 0 degrees of
The cross section at the 180-degree line position is shown. FIG. 41 shows a cross section at another angle different from FIGS. 40 (a) and 40 (b). FIG. 42 is a side cross-sectional view for explaining the operation of this embodiment, and shows a cross section at a 0-180 degree line position in FIG. The upper drum Du is a drum motor M
The upper drum fixing member 2 fixed to the rotating shaft 1 of FIG. When the drum motor Md rotates at a predetermined rotation speed, the rotating magnetic heads Ha and Hb fixed to the upper drum Du are rotatably supported by bearings 5 and 6 mounted on the fixed drum Dd. It rotates integrally with the rotating shaft 1. 23 is a rotary transformer fixed to the upper drum fixing member 2;
Reference numeral 4 denotes a rotary transformer mounted on the lower drum Dd. Further, a stator 105 of a drum motor Md is fixed to the lower drum Dd by screws 12, 13.
The rotor 92 includes a shaft fixing member 1 fixed to the rotating shaft 1.
1 is attached by screws 9 and 10. The drum motor Md shown in FIG.
05 is provided with a coil 15 and its rotor 92
Is provided with a permanent magnet 14.

GA is a guide for guiding the reference edge Te of the magnetic tape T. The guide GA is separate from the upper drum Du and the lower drum Dd and is integrally formed with the base plate BP. . And this guide part GA,
The lower drum Dd is provided on the drum base DB via an annular cam member CRA used for adjusting the inclination of the center axis of the lower drum Dd while being loosely fitted on the outer peripheral surface of the small diameter portion 288. The direction of the drum pair DA between the bottom portion 283 of the small diameter portion 288 of the lower drum Dd and the base plate BP integrally formed with the guide portion GA is shown in FIG. As shown in FIG.
0, 31 are provided. Also, base plate BP
And the bottom portion 283 of the small-diameter portion 288 of the lower drum Dd.
An annular cam member CA used for adjusting the inclination of the rotating shaft 1 is provided between the cam member CA and the cam member CA. That is, when the annular cam member CA is rotated as described later, the upper drum Du, the lower drum Dd, and the drum motor Md move the straight line L7 connecting the rotation fulcrum members 30 and 31 to the center axis of rotation. 40B, it is inclined integrally with the center axis of the guide portion GA in the left-right direction about the point Oc in the paper plane of FIG. 40B.

On the lower surface side of the base plate BP, FIG.
The holes 284 and 285 shown in FIG.
(B) are provided with holes 277 and 278 shown in the drawing, and each of the holes 284, 285, 277 and 278 is connected to the mounting substrate 7 of the drum motor Md integrally connected to the lower drum Dd. In between, each individual spring 28
6,287, 40, 41 are mounted. As shown in FIG. 41, a leaf spring 242 (leaf spring 242) is attached to the base plate BP by screws 240 and 241.
25 is fixed at the base end, and the distal end of the leaf spring 242 is fixed to the drum base D.
B, the base plate BP integrally formed with the guide portion GA is pressed against the lower surface of the drum base D.
B is slightly displaceable in the vertical direction with respect to B.

In addition, the positioning of the base plate BP with respect to the drum base DB is performed at 0 degree in the drum pair DA.
The positioning is performed by loosely fitting the positioning pins 243 and 244 provided on the drum base DB in the 180-degree direction into the holes provided on the base plate BP (see FIG. 40B). It should be noted that the detailed structure of the base plate BP used in the present embodiment is not specifically illustrated by using another drawing. The base plate BP of the present embodiment is configured integrally with the guide portion GA. And four holes 284, 285, 27 on the lower side of the base plate BP.
7 and 278 (see FIG. 2 in the tenth embodiment).
In the base plate BP shown with reference to FIGS. 3 to 26, two of the four holes 27 for mounting the spring are used.
5,276 are provided on the upper surface side of the base plate, and the other two holes 277,278 are provided on the lower surface side which is the back surface. ) Is different from the structure of the base plate BP shown in FIGS. 23 to 26, and the configuration and operation of this embodiment can be described with reference to FIGS. 25 and 26. It is.

As described above, the upper surface of the base plate BP integrally formed with the guide portion GA and the lower drum D
An annular cam member CA functioning as a tilt adjusting means of the rotary shaft 1 is provided between the small diameter portion 288 and the bottom portion 283 of the small diameter portion 288. The lower surface side of the base plate BP and the upper surface side of the drum base DB are provided. Between the base plate BP
An annular cam member CRA is provided which functions as a tilt adjusting means for the central axis of the guide portion GA integrally formed with the guide member GA. The positioning of the annular cam member CRA with respect to the drum base DB is performed at 90 degrees and 270 degrees in the drum pair DA.
Positioning pin 2 provided on drum base DB in degree direction
45 and 246 (see FIGS. 40 (a) and 25) are brought into contact with the inner peripheral edge of the annular cam member CRA.

Here, the annular cam member CA for adjusting the inclination of the rotating shaft and the annular cam member CRA functioning as the inclination adjusting means for the central axis of the guide GA are the same as those shown in FIG. A configuration can be used. Cam contours 258 to 258 formed on the upper surface of the annular cam member CA
The cam followers 36 and 37 projecting from the lower drum Dd are configured to abut the 263 (see FIG. 25). That is, when the annular cam member CA is rotated by applying a driving force from a driving source (not shown), the upper drum Du, the lower drum Dd, and the drum motor Md connected via the rotary shaft 1 are rotated. The component part consisting of the following is defined by using a straight line L7 connecting the rotation fulcrum members 30 and 31 as a center axis of rotation, and by a predetermined angle with respect to the center axis of the guide part GA in FIG. In this case, the track correction is performed by inclining integrally in the left-right direction around the point Oc.

The annular cam member CRA provided between the lower surface side of the base plate BP and the upper surface side of the drum base DB has a cam profile 2 formed on the upper surface thereof.
The cam followers 247 and 248 projecting from the base plate BP are configured to abut against 51 to 256 (see FIG. 25). Further, fulcrum plane portions 238 and 239 are formed on the annular cam member CRA, and the fulcrum plane portions 238 and 239 are formed on the base plate B.
The fulcrum projections 249 and 250 projecting from the back surface side of P
It is configured to abut against. That is, when the annular cam member CRA is rotated by applying a driving force from a driving source (not shown), the center axis of the guide portion GA fixed to the base plate BP is adjusted to the fulcrum projections 249 and 2.
With the straight line L9 connecting 50 as the center axis of rotation, the lead correction is performed by inclining the drum base DB by a predetermined angle in the left-right direction about the point Oc 'in the plane of FIG. Will be done.

As described above, in the present embodiment, it is not always necessary to provide the positions of the rotation fulcrum members 30 and 31 serving as the rotation fulcrum of the rotation locus surfaces of the rotary magnetic heads Ha and Hb near the rotation locus surfaces. . Because, in this embodiment, the upper drum D
Since u and the lower drum Dd rotate integrally to perform track correction, the contact state between the magnetic gap T of the rotating magnetic heads Ha and Hb and the magnetic tape T changes depending on the position of the rotation fulcrum. Because there is no. Rather, in the case of the present embodiment, the positions of the rotation fulcrum members 30 and 31 are
The position should be considered so as to be close to each other in relation to the fulcrum projections 249 and 250 projecting from the rear surface of the base plate BP.

Next, the states of the annular cam member CA and the annular cam member CRA when the magnetic recording / reproducing apparatus according to the present embodiment is operating in each reproduction mode will be described. When operating in the normal reproduction mode, the cam follower 36 and the cam follower 37 projecting from the lower drum Dd abut on the cam contour 262 and the cam contour 259 of the annular cam member CA, respectively. I have. On the other hand, the cam follower 247 and the cam follower 248 projecting from the base plate BP form the cam profile 255 of the annular cam member CRA.
And the cam contour 252. The cam profiles 259 and 262 of the annular cam member CA are configured to have the same height, and the cam profiles 255 and 252 of the annular cam member CRA have the same height as the fulcrum plane portions 238 and 239. When the magnetic recording / reproducing apparatus is operating in the normal reproduction mode,
The center axis of the upper drum Du and the lower drum Dd and the center axis of the guide part GA are aligned in a predetermined direction suitable for the normal reproduction mode. Accordingly, in this operating state, the magnetic tape T is brought into contact with the reference edge Te correctly over the entire area of the guide portion GA provided separately from the lower drum Dd, and the magnetic tape T is stably held at the proper position. Therefore, as shown in FIG. 52 (a), for example, a reproduced signal indicating an envelope in a good state can be obtained.

Next, when operating in the FF playback mode, the cam follower 36 and the cam follower 37 projecting from the lower drum Dd form the cam profile 26 of the annular cam member CA.
1 and the cam profile 258, respectively. The cam profile 261 of the annular cam member CA is the cam profile 2
Since it is configured to be higher than 58, the center axis of the upper drum Du and the lower drum Dd is the same as that of FIG.
As shown in the figure, the track correction is performed by inclining rightward with respect to the guide portion GA.

At this time, the annular cam member CA and the pin 2
Annular cam members C connected by 66-268
The cam contour 254 and the cam contour 251 in RA include:
Base plate B provided separately from lower drum Dd
P and cam followers 247 and 24
8 are in contact with each other.

The cam profile 254 of the annular cam member CRA is configured to be higher than the cam profile 251.
And the fulcrum plane portion 238, 2 of the annular cam member CRA.
Since the fulcrum projections 249 and 250 projecting from the base plate BP are in contact with the base 39, the guide portion GA formed integrally with the base plate BP has the fulcrum projections 249 and 250. Are tilted by an angle corresponding to the difference between the heights of the two cam profiles 254 and 251 with the straight line L9 connecting the two as the central axis of rotation. As a result, the central axis of the guide GA is inclined by a predetermined slight angle in the direction of inclination of the central axes of the upper drum Du and the lower drum Dd, and lead correction is performed. This makes it possible to make proper contact with the entire area of the guide portion GA provided separately from the lower drum Dd, and to travel at a predetermined traveling speed while being stably held at the proper position.

Next, when operating in the FB reproduction mode, the cam follower 36 and the cam follower 37 projecting from the lower drum Dd form the cam profile 26 of the annular cam member CA.
3 and the cam contour 260 respectively. The cam profile 263 of the annular cam member CA is the cam profile 2
Since it is configured to be lower than 60, the central axes of the upper drum Du and the lower drum Dd are as shown in FIG.
As shown in (1), track correction is performed by inclining leftward with respect to the guide portion GA.

At this time, the annular cam member CA and the pin 2
Annular cam members C connected by 66-268
The cam contour 256 and the cam contour 253 in RA include:
Base plate B provided separately from lower drum Dd
P and cam followers 247 and 24
8 are in contact with each other.

The cam profile 256 of the annular cam member CRA is configured to be lower than the cam profile 253,
And the fulcrum plane portion 238, 2 of the annular cam member CRA.
Since the fulcrum projections 249 and 250 projecting from the base plate BP are in contact with the base 39, the guide portion GA formed integrally with the base plate BP has the fulcrum projections 249 and 250. Is inclined by an angle corresponding to the difference between the heights of the two cam profiles 256 and 253 with the straight line L9 connecting As a result, the central axis of the guide GA is inclined by a predetermined slight angle in the direction of inclination of the central axes of the upper drum Du and the lower drum Dd, and lead correction is performed. This makes it possible to make proper contact with the entire area of the guide portion GA provided separately from the lower drum Dd, and to travel at a predetermined traveling speed while being stably held at the proper position.

Next, a fifteenth embodiment of the present invention will be described with reference to FIGS. 4 and 43 to 48 referred to in the first embodiment. The tenth to fourteenth embodiments described above employ the read correction described above with reference to FIGS. 49 (c) and 50 (c). That is, while the upper drum Du or the upper drum Du and the lower drum Dd rotate integrally, the track correction is performed by inclining the rotation trajectory surfaces of the rotary magnetic heads Ha and Hb, while the lower drum Dd is integrated. The lead correction is performed by rotating the guide portion G or the guide portion GA separate from the lower drum Dd.

On the other hand, in this embodiment, first, FIG.
(D) and the lead correction described with reference to FIG. 50 (d) are adopted. That is, as described in the first to ninth embodiments or the fourteenth embodiment, the rotation is performed by the rotation of the upper drum Du or the integral rotation of the upper drum Du and the lower drum Dd. The track correction is performed by inclining the rotation trajectory surfaces of the magnetic heads Ha and Hb, and the read correction is performed by displacing the supply side guide roller SGR and the take-up side guide roller TGR with respect to the drum pair DA in the width direction of the magnetic tape T. Then, the reference edge Te is configured to be along the guide portion G formed on the lower drum Dd or the guide portion GA provided separately from the lower drum Dd.

FIG. 47A is a cross-sectional view showing the structure around the pair of drums. FIG. 47B is a cross-sectional view taken along the line of 90 ° -270 ° in FIG. 0 degrees of
The cross section at the 180-degree line position is shown. FIG. 48 is a side sectional view for explaining the operation of this embodiment.
FIG. 3 shows a cross section at a 0-180 degree line position in FIG. 2. In FIG. 43A or FIG. 45, DA is a drum pair. As the drum pair DA, for example, FIG.
One having a configuration mode as exemplified in FIG. 7 can be used. Since the configuration of the drum pair DA shown in FIG. 4 has been described in the first embodiment, the description of the configuration itself is omitted here, and FIG.
The operation mode will be described in conjunction with (a) or the drum pair DA shown in FIG. 47 in relation to FIG.

First, the configuration around the drum pair shown in FIG. 47 will be briefly described. Drum pair D shown in FIG.
A shows the fulcrum projections 249 and 250 provided on the base plate BP from the configuration around the drum pair described in the fourteenth embodiment with reference to FIGS.
In a configuration in which the components such as the cam followers 247 and 248 and the annular cam member CRA are omitted, and the base plate BP is fixed to the drum base DB, in general,
I can say.

The drum pair DA shown in FIG.
47, the components corresponding to each other in the drum pair DA shown in FIG. 47 are denoted by the same reference numerals, so that differences in the configuration between the drum pairs DA can be immediately understood. There will be. That is, the drum pair D shown in FIG.
25A, when the annular cam member CA having the configuration shown in FIG. 25 is used as the annular cam member CA functioning as the inclination adjusting means of the rotating shaft 1, the gear 265 is driven by the rotation of a pinion (not shown). Then, when rotated in the guide groove 257 provided on the upper surface of the drum base DB, the bottom portion 283 of the small diameter portion 288 of the lower drum Dd is rotated.
The cam followers 36 and 37 projecting from the cam member CA sequentially contact the cam profiles 258 to 263 of the annular cam member CA.

When the magnetic recording / reproducing apparatus using the drum pair DA shown in FIG. 47 operates in, for example, a normal reproducing mode, the small-diameter portion 2 of the lower drum Dd
The cam follower 36 projecting from the bottom 283 of the 88
The cam follower 37 comes into contact with the cam contour 262 of the annular cam member CA, and the cam follower 37 comes into contact with the cam contour 259. When operating in the FF playback mode, the cam follower 36 contacts the cam contour 261, and the cam follower 37 contacts the cam contour 258.

As described above, since the cam profile 261 of the annular cam member CA is higher than the cam profile 258, the center axes of the upper drum Du and the lower drum Dd are two. The track is corrected clockwise as shown in FIG. 48 (a) with the straight line L7 connecting the turning fulcrum members 30 and 31 as the center axis of the turning.

Next, when operating in the FB playback mode, the cam follower 36 contacts the cam contour 263 of the annular cam member CA, and the cam follower 37 contacts the cam contour 260. Then, the cam profile 263 of the annular cam member CA
Is configured to be lower than the cam profile 260, the center axis of the upper drum Du and the lower drum Dd is
As shown in FIG. 48 (b), the track is corrected by rotating clockwise as shown in FIG. 48 (b), with the straight line L7 connecting the two rotating fulcrum members 30, 31 as the center axis of the rotation.

In the magnetic recording / reproducing apparatus shown in FIG. 43 (a) or FIG. 45, the drum pair DA used as a part of the component thereof is the same as that shown in FIG.
7, the configuration described above with reference to FIG.
It is not limited to these. That is, first, the second
Each drum pair DA described in the embodiments to the ninth embodiment
In addition, it goes without saying that a drum pair DA of another configuration configured to change the inclination angle of the center axis of the drum pair according to the change of the recording / reproducing mode may be used.

In FIG. 43A, reference numeral Mg denotes a motor with a speed reducer, and a pinion 21 is fixed to an output shaft 20 of the motor. The pinion 21 includes a gear 26 provided on the annular cam member CA via a connecting portion 264.
5 is engaged. Therefore, the rotational force of the motor Mg driven by a control unit (not shown) is applied to the annular cam member CA via the output shaft 20, the pinion 21, and the connecting portion 264.
, The annular cam member CA operates as described above to tilt the rotating shaft 1. A connecting pin 503 is implanted in the connecting portion 264 and penetrates a hole 504 formed in an intermediate portion of the arcuate operating member FA. Two actuating bodies 505 to 508 are provided at both ends of the arc-shaped actuating member FA.

Each of the operating bodies 505 to 508 has
As specifically shown in (b), a plurality of cam profiles 509 to 520 are respectively formed. The cam contours 509 to 520 have lower surfaces of lower flanges 535 of the supply-side guide roller SGR and the take-up side guide roller TGR, which are configured to be displaceable in the width direction of the magnetic tape T as shown later. Are abutted as cam followers. Also, guide rollers SGR, TGR
The lower flange 535 has a cylindrical portion 540 below it.
(See FIG. 44) is provided to cover the shaft 534. The cylindrical portion 5 is provided between the operating body 505 and the operating body 506 and between the operating body 507 and the operating body 508.
There are provided gaps 521 and 522 into which the fork 40 can be inserted. The arc-shaped actuating member FA has elongated holes 523, 52
4 are provided, and guide holes 527, 52 provided in the drum base DB are provided in these long holes 523, 524.
The guide pins 525 and 526 implanted in the inner portion 8 respectively penetrate.

When the motor Mg with a speed reducer is driven and its rotational force is applied to the gear 265 via the pinion 21, the arc-shaped operating member FA is synchronized with the rotation of the annular cam member CA. , Are rotated in guide grooves 527 and 528 provided on the upper surface of the drum base DB. That is, when the guide rollers SGR, TGR attached to the loading mechanism are at the correct positions to be positioned at the time of the recording / reproducing operation, the arc-shaped operating member FA is provided with two at each end. Actuators 505, 506,
The gaps 521 and 522 of the guide grooves 507 and 508 sandwich the cylindrical portion 540 provided below the lower flange 535 of the guide rollers SGR and TGR.
It will be guided and rotated by 7,528. In this manner, when the arcuate operating member FA rotates, the operating body 5
A plurality of cam profiles 509 to 520 provided on 05, 506, 507, and 508 sequentially contact the lower surfaces of the lower flanges 535 of the guide rollers SGR and TGR functioning as cam followers.

Next, with reference to FIG. 44, a specific configuration of the supply-side guide roller SGR and the take-up-side guide roller TGR, which are configured to be displaceable in the width direction of the magnetic tape T, will be described. Supply side guide roller SG
The R and the take-up side guide roller TGR are configured to be displaceable in the width direction of the magnetic tape (vertical direction in FIG. 7) with respect to the support portion PS attached to the substrate 529 of the loading mechanism. Have been. Support PS
Is constituted by two supporting components 530 and 538 provided so as to sandwich the substrate 529 of the loading mechanism, and the supporting components 530 and 538 are connected to each other by sandwiching the substrate 529 of the loading mechanism. Supporting part PS for substrate 529 of loading mechanism
Is configured to be movable upon loading.

Below the support component 530, the hollow portion 5
31 is provided, and a slit S is formed in a part of the outer wall of the hollow portion 531. Also,
A shaft 534 is inserted into a hole provided at the center of each of the support components 530 and 538 of the support portion PS, and a pin 532 is fixed to an end of the shaft 534. Since both ends of the pin 532 are guided by the slit S, the shaft 534 does not rotate when the shaft 534 moves in the vertical direction. Further, a spring 533 for constantly urging the shaft 534 downward is mounted between the pin 532 and the bottom of the hollow portion 531. Therefore, when the arc-shaped operating member FA rotates, the bottom surface of the arc-shaped operating member FA is supported by the supporting component 538 of the supporting portion PS of the guide rollers SGR and TGR.
Is in sliding contact with the end surface of the small-diameter portion 539 formed at the upper part of the. Also, each operating body 505,5 of the arc-shaped operating member FA
06, 507, 508 gaps 521, 522
Are sandwiched by the cylindrical portions 540 provided below the lower flanges 535 of the guide rollers SGR and TGR, and are provided in the guide grooves 527 and 5 provided in the drum base DB.
It is guided by 28 to perform a rotating operation.

The small-diameter portion 539 formed above the support component 538 provided above the substrate 529 of the loading mechanism has a hollow portion 539a having a diameter larger than the diameter of the shaft 534. And the lower flange 53
The cylindrical portion 540 provided below the guide 5 is guided when moving in the vertical direction. Reference numeral 537 denotes a roller having a length corresponding to the width of the magnetic tape T, and is rotatably mounted on the shaft 534. An upper flange 536 is fixed to the upper end of the shaft 534. So the magnetic tape T
Sliding contact with the peripheral surface of a roller 534 provided between the upper surface of the lower flange 535 and the lower surface of the upper flange 536,
Also, the upper surface of the lower flange 535 and the upper flange 53
The vehicle travels in a state where the position in the width direction is regulated by the lower surface of 6.

Next, when the magnetic recording / reproducing apparatus is operating in each of the normal reproduction mode, the FF reproduction mode, and the FB reproduction mode, the supply side guide roller SGR is pulled up by the arcuate operating member FA. The state of the height of the side guide roller TGR (the position of the magnetic tape traveling path) will be described. FIGS. 44 (a) and (b) show cam contours 510 and 513 provided on the operating members 505 and 506 of the arc-shaped operating member FA when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode. The height of the guide rollers SGR and TGR (the position of the magnetic tape running path) is determined by the cam profiles 516 and 519 provided on the operating bodies 507 and 508.
Indicates a regulated state. That is, in the normal reproduction mode, since the upper drum Du in FIG. 4 or the upper drum Du and the lower drum Dd in FIG. 47 are not rotating in any direction, take-up with the supply side guide roller SGR is performed. Side guide roller TGR
Is a state that is not relatively displaced.

FIGS. 44C and 44D show the cams provided on the operating members 505 and 506 of the arc-shaped operating member FA when the magnetic recording / reproducing apparatus is operating in the FF reproducing mode. Shown is a state in which the respective heights (positions of the magnetic tape running paths) of the guide rollers SGR and TGR are regulated by the contours 511 and 514 and the cam contours 515 and 518 provided on the operating bodies 507 and 508. ing. That is, in the FF reproduction mode, the upper drum Du in FIG. 4 or the upper drum Du and the lower drum D in FIG.
Since d is rotated clockwise as shown in FIG. 49 (b) and track correction is performed, the reference edge Te of the magnetic tape T tends to incline by the angle θ2 with respect to the guide portion G or the guide portion GA. However, in order to prevent this, the supply side guide roller SGR
When the take-up guide roller TGR is displaced upward, the reference edge Te of the magnetic tape T is guided over the entire guide portion G or guide portion GA as shown in FIG. The tape T is in a stable running state, and a reproduction signal in a good state can be obtained.

FIGS. 44 (e) and (f) show the cams 505 and 506 provided on the operating member of the arc-shaped operating member FA when the magnetic recording / reproducing apparatus is operating in the FB reproducing mode. The heights of the guide rollers SGR and TGR (the positions of the running paths of the magnetic tape) are regulated by the contours 509 and 512 and the cam contours 517 and 520 provided on the operating bodies 507 and 508. ing. That is, in the FB reproduction mode, the upper drum Du in FIG. 4 or the upper drum Du and the lower drum D in FIG.
Since d is rotated counterclockwise as shown in FIG. 50 (b) to perform track correction, the reference edge Te of the magnetic tape T is inclined by the angle θ2 with respect to the guide G or the guide GA. However, to prevent this, supply-side guide rollers SG
R is displaced upward, and the take-up side guide roller TGR is displaced downward, so that the reference edge Te of the magnetic tape T is guided over the entire guide portion G or guide portion GA as shown in FIG. The magnetic tape T is in a stable running state, and a reproduced signal in a good state can be obtained.

In the magnetic recording / reproducing apparatus described above with reference to FIGS. 43 (a), (b) and 44, the arcuate operating member FA has the operating members 50 provided at both ends thereof.
5 to 508 have a configuration in which a plurality of specific cam profiles 509 to 520 are provided. Next, in the magnetic recording / reproducing apparatus described with reference to FIGS. 45 and 46, a pair of arc-shaped operating members FA1 and FA2 are provided with respective operating members FAf.
1, FAf2 (hereinafter, both are sometimes collectively referred to as “operating body FAf”) in an example in which cam profiles 549, 550, 551, and 552 having uniform inclined surfaces are provided. is there. Also in this example, the operating body FAf of the arc-shaped operating member FA slides on the end surface of the small-diameter portion 539 whose bottom surface is formed above the supporting component 538 of the supporting portion PS of the guide rollers SGR and TGR. contact,
In addition, the two parts which are arranged side by side with a gap in the vicinity of the tip end perform the rotation while sandwiching the cylindrical portion 540 provided below the lower flange 535 of the guide rollers SGR and TGR. .

As described above, when the arc-shaped operating member FA having the operating body FAf having the cam contours 549 to 552 having the uniform inclined surfaces is used, the arc-shaped operating member FA is used. With the rotation, these cam profiles 549
552 are guide rollers S functioning as cam followers
Since the guide rollers SGR and TGR are in contact with the lower surfaces of the lower flanges 535 of the GR and TGR, the heights of the guide rollers SGR and TGR (the positions of the magnetic tape running paths) change steplessly. When the lead correction is performed by changing the heights of the guide rollers SGR and TGR steplessly as described above, the upper drum Du and the intermediate member SA (see FIG. 4 for the drum pair DA) or upper drum Du and lower drum Dd (for the drum pair DA in FIG. 47).
It is preferable to use an annular cam member CA having a cam profile that allows the inclination angle of the central axis of the cam member to be changed steplessly. Guide roller S shown in FIG.
The structure of the GR and TGR is the same as the structure of the guide rollers SGR and TGR described with reference to FIG. 44, and a specific description thereof will be omitted.

In the magnetic recording / reproducing apparatus of the present invention described with reference to FIG. 43, the rotation of the annular cam member CA and the rotation of the arc-shaped operating member FA are controlled by one driving source. However, these driving sources may be provided separately as shown in FIG.

In the magnetic recording / reproducing apparatus shown in FIG.
Mg, Mg1, and Mg2 are motors each having a speed reducer, and a pinion 21 is fixed to an output shaft 20 of the motor Mg, and the pinion 21 is an annular cam member CA.
And a gear 265 provided via a connecting portion 264. Then, the rotational force of the motor driven by the control unit (not shown) is transmitted to the annular cam member CA via the output shaft 20, the pinion 21, the gear 265, and the connecting portion 264, so that the annular cam member CA
Due to the rotation of the magnetic recording / reproducing apparatus, the inclination angle of the rotating shaft 1 is changed by the above-described operation to perform track correction.

A pinion 542 is fixed to the output shaft 541 of the motor Mg1 with a speed reducer, and the pinion 542 is meshed with a gear 543 provided on the arc-shaped operating member FAf1. Further, a pinion 545 is fixed to the output shaft 544 of the motor Mg2 with a speed reducer.
The gear is engaged with a gear 546 provided on Af2. When the motors Mg1 and Mg2 with speed reducers are driven by a control unit (not shown), the arc-shaped operating members FA1 and FA2 rotate in arc-shaped guide grooves 547 and 548 provided in the drum base DB, respectively. Do various works. In addition,
Reference numeral 555 denotes a slot formed in the arc-shaped operation member FA1, 557 denotes a slot formed in the arc-shaped operation member FA2, and 556 and 558 denote base plates DB.
Pins planted in

At one end of each of the arc-shaped actuating members FA1 and FA2, actuating members FAf1 and Ff2 composed of two portions juxtaposed with gaps 553 and 554 therebetween.
Af2 is provided. That is, the operating body FAf1 is
A portion having a cam profile 549 with a uniform inclined surface and a portion having a cam profile 550 with a uniform inclined surface are juxtaposed with a gap 553 therebetween. The operating body FAf2 has a cam profile 551 with a uniform inclined surface and a cam profile 55 with a uniform inclined surface.
2 are provided side by side with a gap 554 therebetween.

When the arcuate actuating member FA1 and the arcuate actuating member FA2 rotate and operate as described above, the actuating body FAf1 and the actuating body FAf2 have their bottom surfaces guided by the guide rollers SGR, SGR. Supporting component 538 of TGR support PS
Is in sliding contact with the end surface of the small-diameter portion 539 formed at the upper part of the. The guide rollers SG are formed by two parts which are arranged side by side with a gap near their respective tips.
Rotating operation is performed with the cylindrical portion 540 provided below the lower flange 535 of R and TGR sandwiched. The cam contours formed on the actuators FAf1 and FAf2 formed at one end of the arc-shaped actuators FA1 and FA2 are as follows.
For example, a plurality of stepwise cam profiles as shown in FIG. 44 may of course be formed, and the arc-shaped actuating members FA1 and FA2 are integrated and provided with one speed reducer. The motor may be used to rotate. However, as in the magnetic recording / reproducing apparatus shown in FIG. 45, using two arc-shaped operating members FA1 and FA2, an operating body FAf1 formed at one end of each of the arc-shaped operating members FA1 and FA2. , FAf2, the height of the supply-side guide roller SGR and the height of the take-up-side guide roller TGR can be individually changed, so that the change in the height of the guide rollers SGR, TGR can be diversified. it can.

In the magnetic recording / reproducing apparatus shown in FIG. 43 or FIG. 45, the amount of rotation of the annular cam member CA to be rotated in accordance with the change of the reproduction mode and the arc-shaped operating member F
A, FA1, FA2 and the like can be controlled by the rotation amount, for example, by providing a position sensor on a component that performs each rotation, and using a control unit (not shown) based on the position information output from the position sensor. The operation can be easily performed by operating each drive source (motor) according to the generated control signal, and a control circuit selected from various known control circuits may be employed for the implementation.

Although the magnetic recording / reproducing apparatus according to the present invention has been described with reference to the first to fifteenth embodiments, it will be understood by those skilled in the art that the present invention is not limited to these embodiments. It is clear to For example, lower drum Dd
The rotation fulcrum between the first member and the intermediate member SA may be configured such that the two can be directly rotated by a pin on a straight line (for example, a straight line L3) that is to be a center axis of rotation. is there.

In the above embodiment, the intermediate member SA is formed by using several types of annular cam members CA (CRA).
Has been described with respect to rotating the lower drum Dd and rotating the lower drum Dd with respect to the drum base DB. However, the method of rotating these is such an annular cam member CA (CRA). ) Is not limited. For example, taking the rotation of the intermediate member SA with respect to the lower drum Dd as an example, a pair of screw holes penetrating at positions on the lower drum Dd or the drum base DB corresponding to the cam followers 36 and 37 of the intermediate member SA are provided. , A pair of screws having a gear fixed to one end thereof are inserted through these screw holes, respectively.
The other end of each screw may be configured to abut one or both of the cam followers 36 and 37. That is, according to such a configuration, by appropriately controlling the motor and rotating the gear provided at one end of each screw, each screw rises or descends and the cam follower 36 of the intermediate member SA,
37, the intermediate member SA can be rotated.

In the above embodiments, examples of FF reproduction, FB reproduction and the like have been described. However, as described above, the magnetic recording / reproducing apparatus according to the present invention employs so-called frame shooting ( It is clear that the method can be applied to time-lapse photography as it is. That is, time-lapse recording may be performed on the stopped magnetic tape in a state where the rotation track surface of the rotary magnetic head is tilted in advance, in consideration of the expected running speed of the magnetic tape during reproduction.

In the above embodiment, the description has been given of the embodiment in which the rotating magnetic heads Ha and Hb are mounted on the rotating upper drum Du. However, as described above, the upper drum Du which does not rotate is used. It is also possible to configure as. Hereinafter, a case in which the first embodiment is modified to have such a configuration will be briefly described with reference to FIG. FIG. 55 (a) is a cross-sectional view showing the configuration around the drum pair. FIG. 55 (b) is a cross-sectional view taken along the line 90 ° -270 ° in FIG. The cross section at the -180 degree line position is shown.

In this configuration example, the upper drum Du is
It is coaxially fixed to the lower drum Dd fixed to the drum base by the holding bracket 601. The rotating plate 602 on which the rotating magnetic heads Ha and Hb are mounted is
It is attached to the rotating shaft 1 via a fixing member 603. Other configurations are substantially the same as those of the first embodiment described with reference to FIG. Accordingly, in this configuration example, the drum motor Md, the intermediate member SA, the rotating plate 602, and the like rotate integrally around the straight line L3 (point Oc) to perform track correction, and the upper drum Du is a magnetic tape. T
Will function as a sliding surface. That is,
In this configuration, since the upper drum Du is integrally fixed to the lower drum Dd, the sliding surface of the magnetic tape T is not displaced by the rotation of the intermediate member SA or the like, and the magnetic tape T is Du and the lower drum Dd are always kept in a constant sliding contact state. Here, the first embodiment described above is modified so that the upper drum D
Although an example in which u is not rotated has been described, it is needless to say that a similar modification can be made in other embodiments so that the upper drum Du is not rotated.

[0208]

As described above, according to the magnetic recording / reproducing apparatus of the present invention, even if the running speed and running direction of the magnetic tape are different between recording and reproducing, the running state of the magnetic tape is different. Can be maintained in a state where the track patterns at the time of recording and at the time of reproduction are always matched, so that a good reproduced image without noise bars can be obtained.

In a conventional magnetic recording / reproducing apparatus using an actuator such as a piezoelectric element or a voice coil, the ratio between the traveling speed of the magnetic tape during recording and that during reproduction is too large due to the limitation of the amplitude frequency characteristics. Although it could not be taken, the magnetic recording / reproducing apparatus of the present invention does not have such a limitation on the amplitude frequency characteristic, and thus can perform trick play at a large speed ratio.

Furthermore, according to the present invention having a configuration employing the track correction and the read correction, even in the high-density recording mode in which the track width is relatively narrow, the track patterns at the time of recording and at the time of reproduction are accurately matched. A good reproduced image without a noise bar can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration around a pair of drums, which is a main part of a magnetic recording / reproducing apparatus according to the present invention, showing a configuration mode in which a drum motor is provided below a lower drum.

FIG. 2 is a plan view of a drum pair.

FIG. 3 is a diagram showing a configuration principle and an operation principle of the magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is a cross-sectional view of a main part of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention, showing a periphery of a drum pair.

FIG. 5 is an exploded perspective view of a main part around the drum pair shown in FIG. 4;

FIG. 6 is a sectional view of a part around a pair of drums, which is a main part of a magnetic recording and reproducing apparatus according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a relationship between a cam member for adjusting the inclination and an inclined state of a rotation shaft of an upper drum.

FIG. 8 is a diagram showing another configuration of the cam member for adjusting the inclination.

FIG. 9 is a cross-sectional view of a drum pair, which is a main part of a magnetic recording / reproducing apparatus according to a third embodiment of the present invention, and the periphery thereof.

FIG. 10 is a sectional view of a part around a pair of drums, which is a main part of a magnetic recording and reproducing apparatus according to a fourth embodiment of the present invention.

FIG. 11 is a diagram showing a relationship between a cam member for adjusting the inclination and an inclined state of a rotation shaft of an upper drum.

FIG. 12 is a cross-sectional view of a main part of a magnetic recording / reproducing apparatus according to a fifth embodiment of the present invention, showing a periphery of a drum pair.

13 is an exploded perspective view of a main part around a pair of drums shown in FIG.

FIG. 14 is a cross-sectional view of a drum pair, which is a main part of a magnetic recording and reproducing apparatus according to a modification of the fifth embodiment;

FIG. 15 is a cross-sectional view of a drum pair, which is a main part of a magnetic recording / reproducing apparatus according to a sixth embodiment of the present invention, showing the periphery thereof.

FIG. 16 is a cross-sectional view of a drum pair, which is a main part of a magnetic recording and reproducing apparatus according to a modification of the sixth embodiment;

FIG. 17 is a cross-sectional view of the periphery of a pair of drums, which is a main part of a magnetic recording / reproducing apparatus according to a seventh embodiment of the present invention.

FIG. 18 is a perspective view showing another configuration of the periphery of the drum, which is a main part of the magnetic recording / reproducing apparatus according to the present invention, showing a configuration in which a drum motor is provided above the upper drum.

FIG. 19 is a cross-sectional view of the periphery of a drum pair, which is a main part of a magnetic recording and reproducing apparatus according to an eighth embodiment of the present invention.

20 is an exploded perspective view of a main part around the drum pair shown in FIG. 19;

FIG. 21 is a cross-sectional view of a drum pair, which is a main part of a magnetic recording / reproducing apparatus according to a ninth embodiment of the present invention, and the periphery thereof.

FIG. 22 is a diagram showing a configuration principle and an operation principle of the magnetic recording / reproducing apparatus of the present invention.

FIG. 23 is a cross-sectional view of a drum pair, which is a main part of a magnetic recording / reproducing apparatus according to a tenth embodiment of the present invention, and a periphery thereof.

FIG. 24 is another sectional view of the periphery of the drum pair, which is a main part of the magnetic recording and reproducing apparatus according to the tenth embodiment of the present invention.

FIG. 25 is an exploded perspective view of a main part around the drum pair shown in FIG. 23 or FIG. 24;

26 is a perspective view of the base plate shown in FIG. 25 as viewed from the back surface side.

FIG. 27 is a side sectional view for explaining the operation of the tenth embodiment shown in FIG. 23 or FIG. 24;

FIG. 28 is a sectional view of the periphery of a drum pair, which is a main part of a magnetic recording and reproducing apparatus according to an eleventh embodiment of the present invention.

FIG. 29 is another cross-sectional view of the periphery of a drum pair, which is a main part of the magnetic recording / reproducing apparatus according to the eleventh embodiment of the present invention.

30 is an exploded perspective view of a main part around the pair of drums shown in FIG. 28 or 29. FIG.

FIG. 31 is a side sectional view for explaining the operation of the eleventh embodiment shown in FIG. 28 or FIG. 29;

FIG. 32 is an exploded perspective view showing another configuration example of a main part around the drum pair shown in FIG. 28 or 29.

FIG. 33 is a cross-sectional view of a drum pair which is a main part of a magnetic recording and reproducing apparatus according to a twelfth embodiment of the present invention.

FIG. 34 is an exploded perspective view of a main part around the drum pair shown in FIG. 33.

FIG. 35 is a side sectional view for explaining the operation of the twelfth embodiment shown in FIG. 33;

FIG. 36 is an exploded perspective view showing another configuration example of a main part around the drum pair shown in FIG. 33.

FIG. 37 is a sectional view of the periphery of a drum pair, which is a main part of a magnetic recording and reproducing apparatus according to a thirteenth embodiment of the present invention.

38 is an exploded perspective view of a main part around the drum pair shown in FIG. 37.

FIG. 39 is a side sectional view for explaining the operation of the thirteenth embodiment shown in FIG. 37;

FIG. 40 is a sectional view of the periphery of a drum pair, which is a main part of a magnetic recording and reproducing apparatus according to a fourteenth embodiment of the present invention.

FIG. 41 is another sectional view of the periphery of a drum pair which is a main part of a magnetic recording and reproducing apparatus according to a fourteenth embodiment of the present invention.

FIG. 42 is a side sectional view for explaining the operation of the fourteenth embodiment shown in FIG. 40 or 41.

FIG. 43 is a perspective view showing still another configuration around a pair of drums which is a main part of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 44 is a side sectional view of a part of the component shown in FIG. 43.

FIG. 45 is a perspective view showing still another configuration around the drum pair, which is a main part of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 46 is a side sectional view of a part of the component shown in FIG. 45;

FIG. 47 is a cross-sectional view of a drum pair, which is a main part of a magnetic recording and reproducing apparatus according to a fifteenth embodiment of the present invention;

FIG. 48 is a side sectional view for explaining the operation of the fifteenth embodiment shown in FIG. 47;

FIG. 49 is a side view for explaining the running state of the magnetic tape near the drum pair.

FIG. 50 is a side view for explaining the running state of the magnetic tape near the drum pair.

FIG. 51 is a diagram showing a general magnetic tape traveling system near a drum pair.

FIG. 52 is a diagram showing an FM reproduction signal waveform.

FIG. 53 is a diagram schematically showing a tape pattern.

FIG. 54 is a diagram schematically showing a tape pattern.

FIG. 55 is a cross-sectional view showing a main part of a modified example in which the first embodiment is modified.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotating shaft 2 upper drum fixing member 5 bearing 6 bearing 7 drum motor mounting board 11 shaft fixing member 23 rotation transformer 24 rotation transformer 26 inclined pole 27 inclined pole 30 member for rotation fulcrum 31 member for rotation fulcrum 36 cam follower 37 Cam follower 73 Rotary transformer 74 Rotary transformer 78 Cam follower 79 Cam follower 92 Rotor 93 Bearing 94 Bearing 98 Bearing part 99 Fixed shaft 105 Stator 247 Cam follower 248 Cam follower 300 Leaf spring 317 Cam follower 318 Cam follower 400 Leaf spring 424 Cam follower 425 Cam follower DA Drum pair Du Upper drum Dd Lower drum Dd DB Drum base Md Drum motor Ha Rotating magnetic head Hb Rotating magnetic head T Magnetic tape Te Reference edge of magnetic tape SA Intermediate member SA CA Annular Cam Member CRA Annular cam member G Guide part GA guide part Mg motor SGR Guide roller TGR Guide roller BP Base plate FA Arc-shaped operating member

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI G11B 15/60 G11B 15/60 D (56) References JP-A-58-12129 (JP, A) JP-A-62-217457 ( JP, A) JP-A-56-54656 (JP, A) JP-A-61-196458 (JP, A) JP-A-61-1996459 (JP, A) Full-open 1986-158633 (JP, U) 54-105508 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 15/60-15/61

Claims (16)

(57) [Claims] 1. A drum pair comprising: an upper drum; and a lower drum having at least a lead for guiding a reference edge of a magnetic tape and a sliding surface of the magnetic tape. In a magnetic recording / reproducing apparatus for recording / reproducing a signal by forming an inclined track on a magnetic tape wound around a part of a peripheral surface, the magnetic recording / reproducing apparatus includes: A support fulcrum for the rotation locus surface provided on a straight line perpendicular to the center axis of the lower drum, and a rotation locus surface rotation for rotating the rotation locus surface of the rotary magnetic head around the straight line for a predetermined angle. Means, an intermediate member comprising the rotating magnetic head and a bearing for supporting a rotating shaft of the rotating magnetic head; and a suspension means for coaxially suspending the intermediate member with respect to the lower drum. Drum and the intermediate member Magnetic recording and reproducing apparatus characterized by comprising the support fulcrum of the rotation trajectory plane between. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the straight line passes through a substantially central position of a winding range of the magnetic tape around the peripheral surface of the pair of drums. 3. The magnetic recording / reproducing apparatus according to claim 1, wherein said suspension means is provided at a position close to a plane orthogonal to a center axis of said lower drum and including said support fulcrum of said rotation locus plane. A first edge formed on the outer diameter of the intermediate member to loosely fit with the inner diameter of the drum, and a support means for resiliently supporting the intermediate member on the base of the device. Magnetic recording and reproducing apparatus. 4. The magnetic recording / reproducing apparatus according to claim 1, wherein the support fulcrum of the rotation locus surface is formed with a second edge protruding inward of the lower drum. And a pair of holes provided in one of the surfaces of the intermediate member facing the second edge and the second edge, and the second edge or the second to be loosely fitted with the pair of holes, respectively. And a pair of pins provided on one of the surfaces of the intermediate member facing the edge of the magnetic recording / reproducing device. 5. The magnetic recording / reproducing apparatus according to claim 1, wherein the suspension means is provided at an intermediate position near a plane orthogonal to a central axis of the lower drum and including the support fulcrum of the rotation locus plane. A first edge formed on the inner diameter of the lower drum for loosely fitting with the outer diameter of the member, and a support means for resiliently supporting the intermediate member on the base of the device. Magnetic recording and reproducing apparatus. 6. The magnetic recording / reproducing apparatus according to claim 1, wherein the supporting fulcrum of the rotation locus surface is formed so as to protrude outward from the intermediate member. A pair of holes provided in one of a second edge and a surface of the lower drum opposed to the second edge; and the second edge to be loosely fitted with the pair of holes, respectively. Alternatively, the magnetic recording / reproducing apparatus comprises a pair of pins provided on either the other surface of the lower drum facing the second edge. 7. The magnetic recording / reproducing apparatus according to claim 6, wherein the second edge formed so as to protrude outwardly of the intermediate member has an outer diameter of a sliding surface of the lower drum on which the magnetic tape slides. A magnetic recording / reproducing apparatus having the same outer diameter. 8. A drum pair comprising: an upper drum; and a lower drum having at least a lead for guiding a reference edge of the magnetic tape and a sliding surface of the magnetic tape, wherein the rotating magnetic head controls the pair of drums. A magnetic recording / reproducing apparatus for recording / reproducing a signal by forming an inclined track on a magnetic tape wound around a part of a peripheral surface, a bearing for supporting the rotating magnetic head and a rotating shaft of the rotating magnetic head And a flexible member for coaxially connecting the intermediate member and the lower drum on a straight line orthogonal to the central axis of the lower drum in or near the rotation locus plane of the rotary magnetic head. A rotating member for rotating the rotating track surface of the rotary magnetic head around the straight line at a predetermined angle, and the flexible member has an outer diameter of the flexible member. Mates with inner diameter of lower drum A large-diameter ring, a small-diameter ring whose inner diameter is fitted to the outer-diameter portion of the intermediate member and provided concentrically with the large-diameter ring, and the large-diameter ring and the small-diameter ring at two positions on the straight line. A magnetic recording / reproducing apparatus comprising: a connecting member to be connected; wherein the large-diameter ring is fixed to the lower drum, and the small-diameter ring is fixed to the intermediate member. 9. A magnetic recording / reproducing apparatus according to claim 8, wherein said straight line passes through a substantially central position of a winding range of a magnetic tape around a peripheral surface of said pair of drums. 10. The magnetic recording / reproducing apparatus according to claim 1, wherein the rotation trajectory plane rotating means is in a plane orthogonal to the straight line and including the central axis of the lower drum. A magnetic recording / reproducing apparatus, comprising a cam member for pressing the intermediate member in a direction parallel to a center axis of the lower drum. 11. The magnetic recording / reproducing apparatus according to claim 1, wherein the rotation locus plane rotating means is orthogonal to the center axis of the lower drum and supports the rotation locus plane. A magnetic recording / reproducing apparatus, comprising: a cam member for pressing the intermediate member in a direction orthogonal to the straight line in a plane not including a fulcrum. 12. The magnetic recording / reproducing apparatus according to claim 1, wherein a running height of the magnetic tape is provided at an entrance side of the pair of drums in a running path of the magnetic tape. A first guide roller for regulating, a second guide roller provided on an exit side of the pair of drums in a traveling path of the magnetic tape, and regulating a traveling height of the magnetic tape; and a first guide roller. First drive means for changing the height of the magnetic tape in the width direction of the magnetic tape; and second displacement drive means for changing the height of the second guide roller in the width direction of the magnetic tape. A magnetic recording / reproducing apparatus characterized by the above-mentioned. 13. A drum pair comprising: an upper drum; and a lower drum having at least a lead for guiding a reference edge of the magnetic tape and a sliding surface of the magnetic tape. In a magnetic recording / reproducing apparatus for recording / reproducing a signal by forming an inclined track on a magnetic tape wound around a part of a peripheral surface, the magnetic recording / reproducing apparatus is provided on a first straight line orthogonal to a center axis of the lower drum. A support fulcrum for the lower drum, a support fulcrum for the rotation locus plane provided on or near a rotation locus plane of the rotary magnetic head and on a second straight line parallel to the first straight line; A lower drum rotating means for rotating the lower drum around the first straight line at a predetermined angle; and a rotating locus surface for rotating the rotating locus surface at a predetermined angle about the second straight line. A magnetic recording device comprising a rotating means. Recording and playback device. 14. A magnetic recording / reproducing apparatus according to claim 13, wherein said first straight line passes through a substantially central position of a winding range of a magnetic tape around a peripheral surface of said pair of drums. Playback device. 15. The magnetic recording / reproducing apparatus according to claim 13, wherein an intermediate member including the rotating magnetic head and a bearing for supporting a rotating shaft of the rotating magnetic head; A first member for coaxially suspending the intermediate member.
And a second suspension means for suspending the lower drum with respect to the base of the device, and providing the support fulcrum of the rotation path surface between the lower drum and the intermediate member. A magnetic recording / reproducing apparatus, wherein the supporting point of the lower drum is provided between the base and the lower drum. 16. An inclined track is formed on a magnetic tape wound around a part of the peripheral surface of a pair of drums by a rotating magnetic head and provided with a drum pair comprising an upper drum and a lower drum. A magnetic recording / reproducing apparatus for performing a recording / reproducing operation, comprising: a step formed in a lower portion of the lower drum and having a smaller diameter than a magnetic tape sliding contact surface of the lower drum; A lead portion which forms an edge portion having a diameter larger than that of the magnetic tape sliding contact surface and guides a reference edge of the magnetic tape; First rotating means for integrally rotating the drum pair and the rotary magnetic head, and rotating the lead portion over a predetermined angle around a second straight line parallel to the first straight line. A magnetic recording / reproducing apparatus, comprising: