JP2003203302A - Magnetic recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent crosstalk between the transcoil of a recording system and the transcoil of a reproducing system. <P>SOLUTION: A rotary drum unit 28 is roughly constituted of a fixed drum 34 fixed on a main chassis 32, a rotary drum 36 rotatably supported above the fixed drum 34, a rotary shaft 38 connected to the center hole 36a of the rotary drum 36, and a motor 40 for rotary-driving the rotary shaft 38. A recording rotary transformer 78 is arranged between the upper surface of the rotary drum 36 and a supporting member 42, and a reproducing rotary transformer 80 is arranged between the bottom surface of the rotary drum 36 and the fixed drum 34. Thus, since the recording rotary transformer 78 and the reproducing rotary transformer 80 are separated from each other to positions in an axial direction, superimposition of noise on a reproducing signal caused by crosstalk is prevented. <P>COPYRIGHT: (C)2003,JPO

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 configured to slide a magnetic tape on a rotating drum having a plurality of magnetic heads for magnetic recording / reproducing.

[0002]

2. Description of the Related Art For example, as a magnetic recording / reproducing device used as a storage means of a computer, there is a streamer device which magnetically records information by a helical scan method by bringing a rotary head into sliding contact with a magnetic tape.

This type of magnetic recording / reproducing apparatus includes a rotary drum (also called "upper drum") to which a plurality of magnetic heads are attached and a fixed drum (also called "lower drum") fixed on a chassis. The rotary drum is connected to the upper end of the rotary shaft which is supported by the central portion of the fixed drum. Then, the rotation of the motor arranged below the fixed drum is transmitted to the rotating drum via the rotating shaft.

A pair of recording magnetic heads and a pair of reproducing magnetic heads are arranged on the rotary drum in the circumferential direction.
They are arranged alternately at 0 degree intervals. The pair of recording magnetic heads and the pair of reproducing magnetic heads are arranged at 180 ° intervals for the a channel and the b channel, respectively.

Therefore, for example, the tape winding angle is 18
When set to 0 degrees, when the recording magnetic head for the a channel advances 90 degrees, the reproducing magnetic head for the a channel starts sliding contact with the magnetic tape. Further, when the recording magnetic head for the a channel advances 180 degrees, the reproducing magnetic head for the a channel moves to the position of 90 degrees, and at the same time, the recording magnetic head for the b channel starts sliding contact with the magnetic tape. To do.

As described above, the recording magnetic head and the reproducing magnetic head can simultaneously record and reproduce information while slidingly contacting the magnetic tape.

On the other hand, each magnetic head provided on the rotary drum is connected via a rotary transformer to an amplifier or the like arranged on the fixed side substrate. The rotary transformer comprises a pair of rotary transformer halves formed in an annular shape, and is arranged such that the rotor-side rotary transformer halves and the stator-side rotary transformer halves face each other with a minute gap therebetween. It Further, grooves for accommodating the transformer coils corresponding to the respective magnetic heads are concentrically formed on the plane of each rotary transformer half body, and the recording transformer coil and the reproducing transformer coil are the same when they are close to each other. It is mounted on a flat surface.

[0008]

In the conventional magnetic recording / reproducing apparatus configured as described above, when magnetic recording and reproduction are simultaneously performed on the magnetic tape wound around the outer circumference of the rotary drum, the magnetic recording / reproduction is relatively large. There is a problem that the leakage flux from the recording transformer coil through which the current flows affects the reproducing transformer coil and crosstalk is likely to occur.

Further, in the conventional magnetic recording / reproducing apparatus, four magnetic heads are arranged on the lower surface of the rotary drum at intervals of 90 degrees, and the outer diameter of the rotary drum is determined by the standard. Since magnetic recording and reproduction are performed in a state where the magnetic head for reproduction and the magnetic head for reproduction are close to each other, when magnetic recording and reproduction are simultaneously performed on the magnetic tape wound around the outer periphery of the rotating drum, a relatively large current flows for recording. There has been a problem that the leakage magnetic flux from the magnetic head affects the reproducing magnetic head to cause crosstalk, resulting in deterioration of the S / N ratio (ratio of signal to noise).

As a method of solving such a problem, for example, a method of increasing the number of heads attached to the rotary drum so that the energization timings of the recording magnetic head and the reproducing magnetic head do not coincide with each other, It is possible to use a double azimuth head that is less susceptible to crosstalk. However, in the above method, not only the manufacturing cost is increased due to the increase in the number of heads, but also the weight of the rotary drum is increased, the load of the rotary drum drive motor is increased, and the power consumption is increased.

Therefore, an object of the present invention is to provide a magnetic recording / reproducing apparatus which solves the above problems.

[0012]

In order to solve the above problems, the present invention has the following features.

According to the first aspect of the present invention, there is provided a rotating drum on which a magnetic tape is slidably contacted with an outer periphery at a predetermined winding angle,
A recording magnetic head provided on a rotating drum for recording information on the magnetic tape, a reproducing magnetic head provided on the rotating drum for reproducing information recorded on the magnetic tape, and connected to the recording magnetic head for recording. A recording rotary transformer that transfers a recording signal between the magnetic head and the fixed side that faces the rotating drum, and a fixed side that is connected to the reproducing magnetic head and faces the rotating magnetic drum and the reproducing magnetic head. A reproduction rotary transformer for transmitting and receiving a reproduction signal is provided, and by separating the recording rotary transformer and the reproduction rotary transformer, a recording system transformer coil and a reproduction system transformer coil are provided. Crosstalk is prevented. Also, by separating the recording rotary transformer and the reproducing rotary transformer,
It is possible to improve the S / N ratio and enhance the performance of magnetic recording / reproducing by the helical scan method.

According to a second aspect of the present invention, either one of the recording rotary transformer and the reproducing rotary transformer is provided on the upper surface side of the rotary drum, and the recording rotary transformer or the reproducing rotary transformer is provided on the upper surface side of the rotary drum. One of the other is provided on the lower surface side of the rotary drum, and the rotary rotary transformer for recording and the rotary transformer for reproduction are separated and arranged on the upper surface side and the lower surface side of the rotary drum. Therefore, the recording rotary transformer and the reproducing rotary transformer can be compactly mounted without significantly changing the shape.

According to a third aspect of the present invention, the rotary transformer provided on the lower surface side of the rotary drum of the recording rotary transformer or the reproducing rotary transformer has an interior of a fixed drum fixed to the lower surface side of the rotary drum. The space formed between the lower surface side of the rotary drum and the fixed drum is effectively utilized by preventing the rotary drum and the fixed drum from increasing in size.

Further, according to the present invention, in the recording rotary transformer or the reproducing rotary transformer, the stator side of the rotary transformer provided on the upper surface side of the rotary drum is a rotary shaft for rotatably supporting the rotary drum. By being supported by the support member supported at the upper end via the bearing, the rotary transformer can be arranged on the upper surface side of the rotary drum without being affected by the rotation of the rotary shaft.

Further, in the invention according to claim 5, the support member is connected to the rotation preventing member extending from the outside,
It is possible to prevent the rotation of the rotary side of the rotary drum provided on the upper surface side of the rotating drum on the stator side.

According to a sixth aspect of the present invention, the recording rotary transformer and the reproducing rotary transformer are housed in a space formed between the rotary drum and a fixed drum facing the lower surface side of the rotary drum. Therefore, the space formed between the lower surface side of the rotary drum and the fixed drum can be effectively used to form a compact structure, and the rotary drum and the fixed drum can be prevented from increasing in size.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention. FIG. 2 is a plan view showing an embodiment of the magnetic recording / reproducing apparatus according to the present invention.

As shown in FIGS. 1 and 2, the magnetic recording / reproducing device 20 is a streamer device, and is used, for example, as an external storage device of a computer.

The magnetic recording / reproducing apparatus 20 has a holder 22 into which a tape cassette (not shown) is inserted, a transport mechanism 24 for transporting the holder 22 to a mounting position, and a magnetic tape wound around a reel of the tape cassette ( A tape loading mechanism 26 for pulling out a tape (not shown), a rotary drum unit 28 for winding a magnetic tape at a predetermined angle by the tape loading mechanism 26, reel drive mechanisms 30, 31 for rotationally driving the reels of the tape cassette, and each of these mechanisms. The main chassis 32 for supporting is generally configured.

The structure of the rotary drum unit 28 forming the essential part of the present invention will now be described.

FIG. 3 is a perspective view of the rotary drum unit 28. FIG. 4 is a vertical sectional view of the rotary drum unit 28.

As shown in FIGS. 3 and 4, the rotary drum unit 28 includes a fixed drum 34 fixed on the main chassis 32, a rotary drum 36 rotatably supported above the fixed drum 34, and a rotary drum unit 28. The rotary shaft 38 is connected to the central hole 36a of the drum 36, and a motor 40 that drives the rotary shaft 38 to rotate.

On the outer periphery of the fixed drum 34, a step 34a is formed spirally for guiding the running position of the magnetic tape (not shown) wound by the tape loading mechanism 26. In addition, a plurality of grooves 36 for preventing magnetic tape from sticking to the outer circumference of the rotating drum 36.
b are formed at a predetermined pitch.

A support member 42 supported by the upper end of the rotary shaft 38 is provided above the rotary drum 36. Further, the ground terminal 4 that slidably contacts the upper end of the rotary shaft 38.
4 is a support arm 46 made of a conductive leaf spring material.
Is pressed against the upper end of the rotary shaft 38. The ground terminal 44 is made of a carbon material having high hardness in consideration of wear resistance.

The stopper arm 48, which is branched laterally from the support arm 46, has a locking hole 48a at its tip end into which a conical projection 50 projecting from the upper surface of the support member 42 is fitted. Therefore, the support member 42 is connected to the stopper arm 48.
It is supported by the upper end of the rotary shaft 38 in a state where it is prevented from rotating.

A motor case 54 is integrally fixed to the rotary shaft 38 via a bush 52 press-fitted at the lower end, and a magnet 56 as a rotor of the motor 40 is annularly arranged on the upper surface of the motor case 54. It is set up. A coil 58 as a stator of the motor 40 is fixed on the substrate 60 above the magnet 56.

The rotary shaft 38 is rotatably supported by a pair of bearings 64 and 66 inserted in the inner circumference of a cylindrical portion 62 provided in the inner circumference of the fixed drum 34. The bearings 64 and 66 are direct type ball bearings in which balls 64b and 66b are interposed between the outer ring 64a and 66a and the rotating shaft 38 without an inner ring, and the balls 64b and 66b directly contact the rotating shaft 38. . Also, the outer rings 64a and 6
Spring receivers 70 and 72 pressed by the coil spring 68 are in contact with the shaft 6a, and press the outer rings 64a and 66a axially with respect to each other.

Since the central hole 36a is connected to the rotary shaft 38, the rotary drum 36 is supported so as to rotate integrally with the rotary shaft 38. Further, as shown in FIG. 5, the recording magnetic head 7 is provided on the lower surface of the rotary drum 36.
4, 76 and reproducing magnetic heads 75, 77 are attached at intervals of 90 degrees in the circumferential direction. The recording magnetic head 74 is for the a channel, and the recording magnetic head 76 is for the b channel. In addition, a reproducing magnetic head 75
Is for the a channel, and the reproducing magnetic head 77 is for the b channel. The magnetic heads 74 to 77 are fixed to the head bases 74a to 77a, and the head bases 74a to 77a are attached to the lower surface of the rotary drum 36 by screws 71 so that the head surface slightly projects from the outer circumference of the rotary drum 36. The mounting positions of the head bases 74a to 77a in the height direction are adjusted by screws 73.

A recording rotary transformer 78 is arranged between the upper surface of the rotary drum 36 and the support member 42, and a reproducing rotary transformer 80 is arranged between the lower surface of the rotary drum 36 and the fixed drum 34. There is. Thus, the recording rotary transformer 78 and the reproducing rotary transformer 8 are
Since 0 is separated into axially separated positions,
For example, while the recording magnetic heads 74 and 76 magnetically record information on a magnetic tape, the reproducing magnetic heads 75 and 7 are simultaneously recorded.
It is possible to prevent the leakage magnetic flux from the recording rotary transformer 78 from affecting the reproducing rotary transformer 80 when reproducing the information recorded on the magnetic tape in 7, and noise due to crosstalk is superimposed on the reproduced signal. To prevent

Therefore, it is possible to improve the S / N ratio without increasing the number of magnetic heads more expensive than the rotary transformer, and without using an expensive magnetic head such as a double azimuth head. Motor 4 for driving the drum
The load of 0 can be reduced, and the rotary transformers are a recording rotary transformer 78 and a reproducing rotary transformer 80.
The manufacturing cost of the rotary drum unit 28 can be reduced at low cost by separating into

The recording rotary transformer 78 is, for example,
The rotary transformer halves 78A and 78B, which are annularly formed of a ferrite material, face each other with a minute gap therebetween,
On the opposing surfaces of the rotary transformer halves 78A and 78B, a-channel transformer coils 82a and 84a and b, respectively.
Channel transformer coils 82b and 84b are embedded. A terminal board 85 called an R terminal is attached to the lower surface of the rotary transformer half body 78A. The terminal board 85 has a wiring pattern (not shown) for connecting the lead wires drawn from the recording magnetic heads 74 and 76 to the transformer coils 82a and 82b.
Are formed.

The reproducing rotary transformer 80 is, for example,
The rotary transformer halves 80A and 80B, which are annularly formed of a ferrite material, face each other with a minute gap therebetween,
On the opposing surfaces of the rotary transformer halves 80A and 80B, a-channel transformer coils 86a and 88a and b, respectively.
Channel transformer coils 86b and 88b are embedded. A terminal board 89 called an R terminal is attached to the upper surface of the rotary transformer half body 80A. This terminal board 89 is a wiring pattern (not shown) for connecting the lead wires drawn from the reproducing magnetic heads 75, 77 to the transformer coils 86a, 86b.
Are formed.

The rotary transformer half body 78A of the recording rotary transformer 78 is fixed to the upper surface of the rotary drum 36, and the rotary transformer half body 80A of the reproducing rotary transformer 80 is fixed to the lower surface of the rotary drum 36 and the terminal board. It is fixed to 89.

The rotary transformer half 78B of the recording rotary transformer 78 is fixed to the lower surface 42b of the supporting member 42 arranged above the rotating drum 36.
Rotary transformer half of regeneration rotary transformer 80
OB is a support portion 34 formed inside the fixed drum 34.
It is fixed to b. The support member 42 is formed in a disk shape, and the center hole 42a thereof has a pair of bearings 9
0 and 92 are inserted. The pair of bearings 90 and 92 are
The bearings 90, 92 are formed of ball bearings, etc., and cylindrical bushes 94 are fitted on the inner circumferences of the bearings 90, 92.
The upper end of the rotary shaft 38 is fitted to the inner circumference of the.

Therefore, the support member 42 is prevented from rotating by the above-mentioned stopper arm 48, and the bearing 90,
Since it is supported by the rotary shaft 38 via 92, it is possible to stably hold the rotary transformer half body 78B without receiving a rotational force even when the rotary shaft 38 rotates.

The reproducing rotary transformer 80 is housed in the space 94 formed inside the fixed drum 34, and the dimensions of the rotary drum 36 and the fixed drum 34 do not have to be changed, and the structure is compact. Therefore, it is possible to prevent the rotating drum unit 28 from increasing in size.

In the above embodiment, the support member 42 is used as the bearing 9
Although it is configured to be supported by the rotary shaft 38 via 0, 92,
It goes without saying that the bearings 90 and 92 may have structures other than ball bearings.

Here, a modification of the rotary drum unit 28 will be described. FIG. 6 is a vertical sectional view of a modified example of the rotary drum unit 28. In FIG. 6, the same parts as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6, in the rotary drum unit 96 of the modified example, the recording rotary transformer 78 and the reproducing rotary transformer 80 are housed in the space 94 formed inside the fixed drum 34. In addition, a recording rotary transformer 78 and a reproducing rotary transformer 80.
Are arranged concentrically in the same plane.

The recording rotary transformer 78 is arranged inside, and the reproducing rotary transformer 80 is arranged outside. A cylindrical shield member 96 is inserted between the recording rotary transformer 78 and the reproducing rotary transformer 80.

The rotary transformer half body 7 on the rotating side of the recording rotary transformer 78 and the reproducing rotary transformer 80.
8A and 80A are supported by a terminal board 89 fixed to the lower surface of the rotary drum 36.

The upper end of the shield member 96 is joined to the lower surface of the terminal board 89, and the terminal board 8
It is provided integrally with 9. In addition, the shield member 96
Has a thin lower end and extends below the rotary transformer halves 78B, 80B so as not to contact the fixed-side rotary transformer halves 78B, 80B.
Inside the fixed drum 34, a pair of support portions 98, 100 to which the fixed rotary transformer halves 78B, 80B are fixed are formed concentrically, and a shield is provided between the support portions 98, 100. The recess 102 is formed in an annular shape so that the lower end of the member 96 does not come into contact with it.

Shield member 96 and terminal board 89
Is made of a material having a larger magnetic resistance than the recording rotary transformer 78 and the reproducing rotary transformer 80. Therefore, the recording rotary transformer 78 and the reproducing rotary transformer 80 are separated from each other by the shield member 96, and the leakage magnetic flux from the recording rotary transformer 78 is prevented from affecting the reproducing rotary transformer 80. .

When the shield member 96 and the terminal board 89 are made of a material having a magnetic resistance smaller than that of the recording rotary transformer 78 and the reproducing rotary transformer 80, the leakage flux is leaked to the terminal board 89. A magnetic layer is formed so as to escape to the outside.

Further, in the modification, since the recording rotary transformer 78 is not provided on the upper surface of the rotary drum 36 as in the above-described embodiment, the supporting member 42, the stopper arm 48, the bearings 90, 92, etc. need to be provided. There is no such thing, and it has a compact configuration.

The mounting positions of the recording rotary transformer 78 and the reproducing rotary transformer 80 are not limited to those in the above-described embodiments and modifications, and the recording rotary transformer 7 is not limited thereto.
It goes without saying that the positions of 8 and the rotary rotary transformer 80 may be exchanged.

[0049]

As described above, according to the first aspect of the invention, the rotating drum on which the magnetic tape is slidably contacted to the outer periphery at a predetermined winding angle, and the information is recorded on the rotating tape provided on the rotating drum. A magnetic recording head, a reproducing magnetic head provided on a rotating drum for reproducing information recorded on a magnetic tape, and a recording magnetic head connected between the recording magnetic head and a fixed side facing the rotating drum. A recording rotary transformer for transmitting and receiving a recording signal, and a reproducing rotary transformer for transmitting and receiving a reproducing signal between the reproducing magnetic head and a fixed side facing the rotating drum. Since the recording rotary transformer and the reproducing rotary transformer are separated from each other, a cross between the recording transformer coil and the reproducing transformer coil is provided. Over click is prevented, leakage flux from the recording rotary transformer can be prevented from affecting the reproducing rotary transformer, it is possible to prevent noise due to crosstalk is superposed on the reproduced signal.

Further, by separating the recording rotary transformer and the reproducing rotary transformer, it becomes possible to improve the S / N ratio and enhance the performance of the magnetic recording / reproducing of the helical scan system. Further, without increasing the number of magnetic heads that are more expensive than rotary transformers, and without using expensive magnetic heads such as double azimuth heads, S / N
The ratio can be improved, the load on the motor for driving the rotary drum can be reduced, and the manufacturing cost can be reduced.

According to the second aspect of the present invention, one of the recording rotary transformer and the reproducing rotary transformer is provided on the upper surface side of the rotary drum, and the recording rotary transformer or the reproducing rotary transformer is provided on the upper surface side of the rotary drum. Since the other one of the rotary transformers is provided on the lower surface side of the rotary drum, the rotary drum for recording and the rotary transformer for reproduction are separated and arranged on the upper surface side and the lower surface side of the rotary drum. The recording rotary transformer and the reproducing rotary transformer can be compactly mounted without significantly changing the shapes.

According to the third aspect of the invention, the rotary drum provided on the lower surface side of the rotary drum of the recording rotary transformer or the reproducing rotary transformer is fixed to the lower surface side of the rotary drum. Since it is housed inside, the space formed between the lower surface side of the rotary drum and the fixed drum can be effectively used to prevent the rotary drum and the fixed drum from increasing in size.

According to the fourth aspect of the present invention, the rotary side of the rotary transformer for recording or the rotary transformer for reproduction provided on the upper surface side of the rotary drum supports the rotary drum so as to rotatably support the rotary drum. Since it is supported by the support member supported on the upper end of the shaft via the bearing, the rotary transformer can be arranged on the upper surface side of the rotary drum without being affected by the rotation of the rotary shaft.

According to the fifth aspect of the invention, since the support member is connected to the rotation preventing member extending from the outside, rotation of the rotary transformer provided on the upper surface side of the rotating drum on the stator side is prevented. can do.

According to the sixth aspect of the invention, the recording rotary transformer and the reproducing rotary transformer are housed in the space formed between the rotary drum and the fixed drum facing the lower surface side of the rotary drum. Therefore, the space formed between the lower surface side of the rotary drum and the fixed drum can be effectively used to form a compact structure, and the rotary drum and the fixed drum can be prevented from increasing in size.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a plan view showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 3 is a perspective view of a rotary drum unit 28.

FIG. 4 is a vertical sectional view of a rotary drum unit 28.

5 is a bottom view of the rotary drum 36. FIG.

FIG. 6 is a vertical cross-sectional view of a modified example of the rotary drum unit 28.

[Explanation of symbols]

20 Magnetic Recording / Reproducing Device 22 Holder 24 Conveying Mechanism 26 Tape Loading Mechanism 28, 96 Rotating Drum Unit 30, 31 Reel Drive Mechanism 32 Main Chassis 34 Fixed Drum 36 Rotating Drum 38 Rotating Shaft 40 Motor 42 Supporting Member 44 Earth Terminal 46 Supporting Arm 48 Stopper Arm 56 Magnet 58 Coil 64, 66, 90, 92 Bearing 74, 76 Recording magnetic head 75, 77 Reproducing magnetic head 78 Recording rotary transformer 80 Reproducing rotary transformer 78A, 78B, 80A, 80B Rotary transformer half body 89, 85 terminal board 94 space 96 shield members 98, 100 support portion 102 recessed portion

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koichi Shimoyama             1601 Sakai, Atsugi, Kanagawa Mitsumi Electric Co., Ltd.             Company Atsugi Office F term (reference) 5D036 AA04 BB02 BB12 BB22 CC04                       CC23 CC67 GG01                 5D091 AA03 EE03 EE09 HH06

Claims (6)

[Claims] 1. A rotary drum on which a magnetic tape is slidably contacted with an outer periphery at a predetermined winding angle, a recording magnetic head provided on the rotary drum for recording information on the magnetic tape, and provided on the rotary drum. A reproducing magnetic head for reproducing information recorded on a magnetic tape, and a recording which is connected to the recording magnetic head and transfers a recording signal between the recording magnetic head and a fixed side facing the rotating drum. A rotary transformer for reproduction, and a reproduction rotary transformer that is connected to the reproduction magnetic head and transfers a reproduction signal between the reproduction magnetic head and a fixed side facing the rotary drum. Characteristic magnetic recording / reproducing device. 2. One of the recording rotary transformer and the reproducing rotary transformer is provided on an upper surface side of the rotating drum, and the recording rotary transformer or the reproducing rotary transformer is provided on an upper surface side of the rotating drum. The other one is provided on the lower surface side of the rotary drum.
The magnetic recording / reproducing apparatus described. 3. The rotary transformer provided on the lower surface side of the rotating drum of the recording rotary transformer or the reproducing rotary transformer is housed inside a fixed drum fixed to the lower surface side of the rotating drum. The magnetic recording / reproducing apparatus according to claim 1, wherein 4. The stator side of the rotary transformer provided on the upper surface side of the rotary drum among the recording rotary transformer and the reproducing rotary transformer has a bearing at an upper end of a rotary shaft that rotatably supports the rotary drum. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is supported by a supporting member supported via the. 5. The magnetic recording / reproducing apparatus according to claim 2, wherein the supporting member is connected to a rotation preventing member extending from the outside. 6. The recording rotary transformer and the reproducing rotary transformer are housed in a space formed between the rotary drum and a fixed drum opposed to a lower surface side of the rotary drum. The magnetic recording / reproducing apparatus according to claim 1.