JP4229108B2 - Rotating drum device - Google Patents

Description

  The present invention relates to a rotary drum device.

  8A and 8B show a conventional rotary drum device 1. The rotary drum device 1 is rotatably supported by a fixed drum 2 and bearing members 3 and 4 in a cylindrical portion 2a at the center of the fixed drum 2, and a rotary shaft 5 penetrating the cylindrical portion 2a. The rotary drum 6 is positioned above the fixed drum 2 and fixed to the rotary shaft 5, and the motor 7 is fixed to the lower side of the fixed drum 2 and rotates the rotary shaft 5.

  A pair of heads 8-1 and 8-2 for channel A and a pair of heads 9-1 and 9-2 for channel B are attached to the rotating drum 6. A fixed transformer 10 is fixed to the fixed drum 2, a rotating transformer 11 is fixed to the rotating drum 6, and the fixed transformer 10 and the rotating transformer 11 face each other. The stationary transformer 10 and the rotating transformer 11 constitute a rotating transformer device 12. A flexible cable 13 extends from the fixed drum 2.

When the motor 7 is driven, the rotary shaft 5 and the rotary drum 6 are rotated, and the recording head 8, the reproducing head 9, and the rotary transformer 11 are rotated. In the recording mode, the recording signal is sent to the heads 8-1 and 9-1 through the flexible cable 13 and the rotary transformer device 12, and recorded on the magnetic tape. At the same time, the tracks on which the heads 8-2 and 9-2 are recorded. The recorded information is reproduced for confirmation. In the reproduction mode, signals picked up from the magnetic tape by the heads 8-2 and 9-2 are taken out through the rotary transformer device 12 and the flexible cable 13.
JP 2002-92801 A

  2. Description of the Related Art A magnetic recording / reproducing apparatus that performs recording / reproducing on a magnetic tape using a rotary drum device is required to increase an information transfer rate.

  For this purpose, the rotating drum device needs to have a large number of channels. However, the rotary drum device 1 has two channels, and it is difficult to sufficiently satisfy the above requirements.

  Therefore, as the rotary drum device, a design with an increased number of channels is progressing. In order to increase the number of channels, it is necessary to increase the number of heads and the number of channels of the rotary transformer device. On the other hand, the external dimensions of the rotary drum device are limited. When the number of heads increases in a limited narrow space, the problem of crosstalk cannot be ignored.

  Then, an object of this invention is to provide the rotating drum apparatus which solved the said subject.

The present invention comprises a lower fixed drum (41),
A rotating shaft (42) rotatably supported on the fixed drum;
An upper rotating drum (43) which is located on the upper side of the fixed drum, is fixed to the rotating shaft, and rotates integrally with the rotating shaft;
A motor (44) which is provided on the lower surface side of the fixed drum and rotates the rotating shaft ;
A holding member (45) that holds the first fixed-side transformer (71), is positioned above the rotating drum, and is supported by a bearing with the rotating shaft;
A flexible signal cable (90) extending from the first fixed transformer,
The rotary drum has a second rotary transformer (82) on the bottom surface, a first rotary transformer (72) on the top surface, and is electrically connected to the first rotary transformer. A first head (A1W, A2W, B1W, B2W) and a second head (A1R, A2R, B1R, B2R) electrically connected to the second rotary transformer,
The fixed drum has a second fixed transformer (81),
The first fixed transformer is opposed to the first rotary transformer to form a first transformer device (70), and the second fixed transformer is opposed to the second rotary transformer. And forming a second transformer device (80),
In the rotating drum device, wherein the first transformer device (70) and the second transformer device (80) are disposed with the rotating drum (43) therebetween ,
The holding member (45) is a material that shields an electric field or a magnetic field, and has a cap shape that covers the first stationary transformer (71).
In addition, the ground pattern (91) of the signal flexible cable (90) is connected to the holding member (45) .

  According to the present invention, when the first transformer device is one of the recording transformer device and the reproduction transformer device and the second transformer device is the other, the distance between the reproduction path and the recording path is a distance. Since the reproduction transformer device is arranged away from the recording transformer device, the electrical influence between the recording path and the reproduction path is reduced, and recording is performed in the recording mode. The reproduction signal for confirmation can be output with a good C / N ratio.

  Next, an embodiment of the present invention will be described.

  1 and 2 show a rotary drum device 40 according to a first embodiment of the invention, and FIG. 3 shows a magnetic recording / reproducing device 20 to which the rotary drum device 30 is applied.

The magnetic recording / reproducing apparatus 20 is used for computer backup and the like, and includes a rotating drum device 40 and a tape loading mechanism 21 as shown in FIG. The tape loading mechanism 21 draws the magnetic tape 31 from the loaded cassette 30 to form a tape path wound around the rotary drum device 40 in an angle range of about 180 degrees. The magnetic tape 31 is composed of the capstan 22 and the pinch roller 23. And the rotary drum device 40 operates to record a signal on the magnetic tape 31 and reproduce a signal recorded on the magnetic tape 31. Recording is performed while reproducing and confirming the recorded state later. In the recording mode, the recording is also performed at the same time.
[Overall Configuration of Rotating Drum Device 40]
As shown in FIGS. 1 and 2, the rotary drum device 40 is roughly composed of a lower fixed drum 41, a rotary shaft 42, an upper rotary drum 43, a motor 44, a holding member 45, and a fixed ring 46. Recording heads A1W, A2W, B1W, B2W, reproducing heads A1R, A2R, B1R, B2R, a recording rotary transformer device 70, a reproducing rotary transformer device 80, a recording signal flexible cable 90, and a reproducing signal Flexible cable 100.

  The fixed drum 41 has a cylindrical portion 41a at the center thereof.

  The rotating shaft 42 is rotatably supported by the bearing members 110 and 111 in the cylindrical portion 41a and penetrates the cylindrical portion 41a. A compression coil spring 112 is provided between the bearing member 110 and the bearing member 111, and pressure is applied to the bearing members 110 and 111.

  The rotating drum 43 is fixed to a portion of the rotating shaft 42 protruding upward from the fixed drum 41, is positioned above the fixed drum 41, and rotates integrally with the rotating shaft 42.

  Eight heads are attached to the lower surface of the rotating drum 43 at intervals of 45 degrees along the periphery. In the circumferential direction, the eight heads are, in order, a first recording head A1W for channel A, a first reproducing head A1R for channel A, a first recording head B1W for channel B, and a first recording head for channel B. 1 reproduction head B1R, second recording head A2W for channel A, second reproduction head A2R for channel A, second recording head B2W for channel B, second reproduction head B2R for channel B, and so on. Become. The recording head A1W, the reproducing head A1R, the recording head A2W, and the reproducing head A2R have the same azimuth angle, and the recording head B1W, the reproducing head B1R, the recording head B2W, and the reproducing head B2R have the same azimuth angle and the same azimuth angle. It is a horn.

  A reproduction-use fixed-side transformer 81 is fixed to the upper surface of the fixed drum 41, and a reproduction-use rotation-side transformer 82 is fixed to the lower surface of the rotary drum 43. The reproduction fixed transformer 81 and the reproduction rotary transformer 82 face each other.

  The reproduction rotary transformer device 80 includes a reproduction fixed transformer 81 and a reproduction rotary transformer 82 which face each other. Inside the rotating drum 43, the reproducing heads 61 and 62 and the reproducing rotary transformer 82 are connected by electric wires. One end of the reproduction signal flexible cable 100 is connected to the stationary transformer 81 and extends outward from the stationary drum 41.

  FIG. 5 shows the holding member assembly 120. The holding member assembly 120 has a configuration in which the recording stationary transformer 71, the recording signal flexible cable 90, and the ball bearing members 130 and 140 are incorporated in the holding member 45.

  6A is a cross-sectional view of the holding member 45, and FIG. 6B is a bottom view of the holding member 45. The holding member 45 is a non-magnetic aluminum material plated with magnetic nickel, has a cap shape, a disk-shaped top plate portion 45a, and a central hub portion 45b of the top plate portion 45a. And an annular portion 45c around the top plate portion 45a, and an opening 45d as a passage for the recording signal flexible cable 90 is formed across the top plate portion 45a and the annular portion 45c.

  The ball bearing members 130 and 140 are fitted and attached to the inner periphery of the hub portion 45b.

  The recording signal flexible cable 90 has a role of holding the holding member 45 so as not to rotate in addition to the path for the recording signal, and the force of bending in the direction along the surface is the ball bearing member 121, It has rigidity exceeding 122 rotational frictional force.

  As shown in FIG. 5, the recording signal flexible cable 90 has a ground pattern 91 at the center, four signal patterns 92 on one side, and four signal patterns 93 on the opposite side. One end 90a of the recording signal flexible cable 90 is divided into three branches 95, 96, and 97 by two slits 94-1 and 94-2. The central branch portion 95 has a ground pattern 91, the end of the signal pattern 92 extends to the branch portion 96, and the end of the signal pattern 93 extends to the branch portion 97. As shown in FIG. 2, the other end 90 b of the recording signal flexible cable 90 has a connector connecting contact portion 98.

  As shown in FIG. 5, the fixed recording transformer 82 has a configuration in which a plurality of coils (not shown) are concentrically arranged on the lower surface side, and the ends of the coils are drawn to the upper surface side. It is a configuration. Branch portions 96 and 97 at one end 90a of the recording signal flexible cable 90 are bonded to the upper surface of the recording rotary transformer 82, and the pads at the ends of the signal patterns 92 and 93 are soldered to the ends of the coils. It is. The recording fixed transformer 82 is fitted in the outer periphery of the hub portion 45 b and is contained in the holding member 45. Further, the branch portion 95 has a central branch portion 95 fixed to the upper surface of the top plate portion 45a with a screw 121.

  The assembly of the holding member assembly 120 will be described later.

  As shown in an enlarged view in FIG. 4, the holding member assembly 120 is attached by fitting ball bearing members 130 and 140 to portions of the rotating shaft 42 protruding above the rotating drum 43. 43 is arranged on the upper surface. As shown in FIG. 1, the lower end 45 c 1 of the annular portion 45 c of the holding member 45 extends downward from the fixed recording transformer 82, and this portion extends around the outer periphery of the recording rotary transformer 72. Covering. The annular portion 45c extends beyond the recording fixed transformer 82 to the outer peripheral side of the recording rotating transformer 72, and a gap between the recording rotating transformer 72 and the recording fixed transformer 82 (from this portion). Electric field and magnetic field leak out).

  As shown in an enlarged view in FIG. 4, the fixing ring 46 is fitted to a portion of the rotating shaft 42 protruding above the holding member assembly 120, and is set from both sides in the diametrical direction by set screws 47 and 48. It is fixed to the rotating shaft 42 and restricts the upward displacement of the holding member assembly 120. The fixing ring 46 rotates together with the rotating shaft 42. The fixing ring 46 has an annular convex portion 46a at the center of the lower surface. The convex portion 46 a hits the inner race 131 of the ball bearing member 130. The fixing ring 46 is not in contact with the holding member 45, and a gap g exists between the fixing ring 46 and the holding member 45.

  The holding member assembly 120 can rotate independently of the rotating shaft 42 and can also rotate independently of the fixing ring 46. By applying the holding force, the holding member assembly 120 can be kept stationary.

  As shown in FIG. 1, a recording rotary transformer 72 is fixed to the upper surface of the rotary drum 43, and this is opposed to the recording fixed transformer 71. A recording rotary transformer 70 is constituted by the recording fixed transformer 71 and the recording rotary transformer 72 facing each other.

  Inside the rotary drum 43, the recording heads 51 and 52 and the recording rotary transformer 72 are connected by electric wires. One end of the recording signal flexible cable 90 is connected to the fixed-side transformer 71 and extends outward from the holding member 45.

  As schematically shown in FIG. 7A, the ball bearing members 130 and 140 include inner races 131 and 141, outer races 132 and 142, and balls 133 and 143, respectively. The outer races 132 and 142 are fitted and fixed to the inner circumferential groove of the hub portion 45b. The outer races 132 and 142 are integrated by the holding member 45. The inner races 131 and 141 are fitted on the rotary shaft 42. The inner race 141 of the lower ball bearing member 140 is supported by a washer 145 that fits on the rotating shaft 42 and rests on the upper surface of the rotating drum 43.

  The fixing ring 46 is fixed in a state in which the annular protrusion 46 a presses the inner race 131 of the ball bearing member 130 downward, and the ball bearing members 130 and 140 are applied with a pressure F by the fixing ring 46. It is in. By applying the pressure F to the inner race 131, the inner race 131, the ball 133, the outer race 132, the holding member 45, the outer race 142, and the ball 143 are displaced downward in this order, and the ball bearing members 130, 140 are displaced. As shown schematically in FIG. 7B, play is absorbed.

As shown in FIG. 1, the motor 44 is fixed to a disk-shaped stator coil 44 a fixed to the lower surface of the fixed drum 41 and a portion of the rotary shaft 42 protruding below the fixed drum 41. It consists of a certain rotor magnet 44b.
[Operation of Rotating Drum Device 40]
In the rotary drum device 40, the fixed drum 41 is fixed to the chassis of the magnetic recording / reproducing device 20 and attached to the magnetic recording / reproducing device 20. The recording signal flexible cable 90 extends horizontally with no slack, and has a tip connected to a connector and fixed. As a result, the potential of the holding member 45 is at the ground level. Note that a fixing member may be provided on the chassis of the magnetic recording / reproducing apparatus 20, and a midway portion of the recording signal flexible cable 90 may be fixed to the fixing member.

  The rotary drum device 40 has two channels for the channel A and two channels for the channel B, and the information transfer rate is higher than the conventional one.

  When the motor 44 is driven, the rotating shaft 42 is rotated, the rotating drum 43 and the fixing ring 46 are rotated integrally with the rotating shaft 42, and the holding member assembly 120 is fixed to the recording signal flexible cable 90. With its rigidity, the rotation is prevented and fixed and stationary. The connecting portion of the recording signal flexible cable 90 to the holding member assembly 120 has a three-dimensional structure in which the branch portion 95 and the branch portions 96 and 97 are separated from each other up and down, so that the structural strength is increased. It is advantageous to keep the holding member assembly 120 stationary without rotating.

In the recording mode, the recording signal is sent to the recording heads A1W, A2W, B1W, B2W through the recording signal flexible cable 90 and the recording rotary transformer device 70, and is recorded on the magnetic tape. At the same time, the reproducing heads A1R, A2R, B1R, B2R follow the previously recorded tracks and confirm that they are normally recorded. The signal that is reproduced later is called a reproduction signal for recording confirmation. In the reproduction mode, signals picked up from the magnetic tape by the reproduction heads A1R, A2R, B1R, B2R are taken out via the reproduction rotary transformer 80 and the reproduction signal flexible cable 100.
[Features of rotating drum device 40]
The rotary drum device 40 can output a recording confirmation reproduction signal with a good C / N ratio by the following configuration.

First Configuration The recording rotary transformer device 70 and recording signal flexible cable 90 constituting the recording path, and the reproducing rotary transformer device 80 and playback signal flexible cable 100 constituting the playback path are arranged with the rotary drum 43 interposed therebetween. Are separated. Therefore, the electrical influence between the recording path and the reproduction path is reduced, and the C / N ratio of the recording confirmation reproduction signal is improved.

Second Configuration The recorded signal has a higher current value than the reproduced signal, and electromagnetic waves leaking out from the recording rotary transformer device 70 tend to affect other portions.

  As shown in FIG. 1, in the rotary drum device 40 described above, the recording rotary transformer device 70 is arranged on the upper surface of the rotary drum 43, and the reproducing heads A1R, A2R, B1R, B2R and the reproducing rotary transformer device 80 are It is arranged on the lower surface side of the rotating drum 43.

  Therefore, first, the reproducing heads A1R, A2R, B1R, and B2R are located away from the recording rotary transformer device 70, and the distance L1 from the recording rotary transformer device 70 of the reproducing heads A1R, A2R, B1R, and B2R. Is long. As a result, the reproducing heads A1R, A2R, B1R, and B2R are not easily affected by electromagnetic waves leaking out from the recording rotary transformer device 70.

  Secondly, the reproducing rotary transformer device 80 is located away from the recording rotary transformer device 70, and the distance L2 of the reproducing rotary transformer device 80 from the recording rotary transformer device 70 is long. As a result, the reproducing rotary transformer device 80 is hardly affected by electromagnetic waves leaking out from the recording rotary transformer device 70.

  When the first and second are combined, the C / N ratio of the recording confirmation reproduction signal is improved.

Third configuration A nickel-plated aluminum material well shields both electric and magnetic fields. The recording rotary transformer device 70 (the recording fixed transformer 71 and the recording rotary transformer 72 facing each other) is covered by a nickel-plated holding member 45 on an aluminum material, and the recording rotary transformer device. Leakage of electric and magnetic fields from 70 is well limited. This also improves the C / N ratio of the recording confirmation reproduction signal.
[Other features of the rotating drum device 40]
The application of pressure to the ball bearing members 130 and 140 is performed by screwing in a state where the fixing ring 46 is pressed downward. For this reason, it is easier to assemble and disassemble than the configuration in which pressurization is applied by press-fitting.
[Modification of Rotating Drum Device 40]
The recording rotary transformer device 70 may be arranged below the rotary drum 43 and the reproducing rotary transformer device 80 may be arranged above the rotary drum 43.
[Assembly of holding member assembly 120]
As shown in FIG. 5, the holding member assembly 120 includes the recording rotation-side transformer 82 to which one end 90 a of the recording signal flexible cable 90 is connected, and the other end 90 b of the recording signal flexible cable 90 to the holding member 45. The recording rotation-side transformer 82 is fitted to the outer periphery of the hub portion 45b, and the recording rotation-side transformer 82 is accommodated in the holding member 45 and bonded to the remaining center. The branch portion 95 is pulled out from the opening 45d and positioned above the top plate portion 45a of the holding member 45. Finally, the central branch portion 95 is fixed to the top surface of the top plate portion 45a with the screws 121. .
[Modification of holding member]
The holding member 45 may be made of iron, which is a magnetic material, or may be a resin molded part that is plated with nickel. The holding member 45 may have a structure in which the ground is made of aluminum and is covered with a material having high magnetic permeability.

It is a fragmentary sectional view of the rotating drum apparatus which becomes Example 1 of this invention. It is a top view of the rotating drum apparatus of FIG. It is a figure which shows the magnetic recording / reproducing apparatus to which the rotating drum apparatus of FIG. 1 is applied. It is a figure which expands and shows the upper part of the rotating drum apparatus of FIG. It is a figure which shows a holding member assembly. It is a figure which shows a holding member. It is a figure which shows roughly the state by which the pressurization was given to the ball bearing member of the holding member assembly. It is a fragmentary sectional view of the conventional rotary drum apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 Magnetic recording / reproducing apparatus 21 Tape loading mechanism 40 Rotating drum apparatus 41 Fixed drum 42 Rotating shaft 43 Rotating drum 44 Motor 45 Holding member 46 Fixing ring 70 Recording rotary transformer apparatus 71 Recording fixed side transformer 72 Recording rotary side transformer 80 Playback Rotating transformer device 81 Reproducing fixed-side transformer 82 Reproducing rotating-side transformer 90 Recording signal flexible cable 100 Reproducing signal flexible cable 120 Holding member assembly 130, 140 Ball bearing member A1W, A2W, B1W, B2W Recording head A1R, A2R, B1R, B2R Playback head

Claims (5)

A lower fixed drum,
A rotating shaft rotatably supported on the fixed drum;
An upper rotating drum that is positioned above the fixed drum, is fixed to the rotating shaft, and rotates integrally with the rotating shaft;
A motor that is provided on the lower surface side of the fixed drum and rotates the rotating shaft ;
A holding member that holds the first fixed-side transformer, is positioned above the rotating drum, and is supported by a bearing with the rotating shaft;
A signal flexible cable extending from the first fixed transformer,
The rotary drum has a second rotary transformer on the lower surface, a first rotary transformer on the upper surface, and a first head electrically connected to the first rotary transformer. And a second head electrically connected to the second rotary transformer,
The fixed drum has a second fixed-side transformer,
The first fixed-side transformer faces the first rotating-side transformer to form a first transformer device, and the second fixed-side transformer faces the second rotating-side transformer and the second A transformer device,
In the rotating drum device, wherein the first transformer device and the second transformer device are disposed with the rotating drum interposed therebetween ,
The holding member is a material that shields an electric field or a magnetic field, and has a cap shape that covers the first fixed-side transformer,
The rotating drum device is characterized in that a ground pattern of the signal flexible cable is connected to the holding member . The rotary drum device according to claim 1 ,
The rotating drum device according to claim 1, wherein the holding member has a shape having an annular portion that covers the first stationary transformer and extends to the outer periphery of the first rotating transformer. The rotary drum device according to claim 1 ,
The holding member has a structure made of a magnetic material, a structure in which a nonmagnetic member is subjected to a surface treatment of a magnetic material, or a structure in which the ground is a nonmagnetic member and is covered with a material having high magnetic permeability. A rotating drum device characterized by the above. A rotary drum apparatus according to any one of claims 1乃Itaru 3,
By fixing a portion of the signal flexible cable extending from the first fixed-side transformer to the side opposite to the first fixed-side transformer to a magnetic recording / reproducing apparatus including the rotating drum device, the first A magnetic recording / reproducing apparatus characterized in that rotation of the fixed-side transformer is prevented. A rotary drum apparatus according to any one of claims 1乃Itaru 3,
A portion of the signal flexible cable extending from the first fixed transformer is fixed to a fixing member provided in the magnetic recording / reproducing apparatus including the rotating drum device. Thus, the magnetic recording / reproducing apparatus is characterized in that the first fixed-side transformer is prevented from rotating.

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