JP2002184067A - Disk rotation driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk rotation driving device, using a self-chucking type turntable having no clamper and which is capable of easily attaching/detaching a disk to/from the turntable. SOLUTION: When a turntable 10 is rotated in α1 direction by applying braking force to a driving body having a switching pin 31b, a pin 31b is relatively moved in an oblong hole 17 in α2 direction and a holding member 21 is made to enter an aperture part 15 of a projection part 11, so that loading of a disk on the turntable 10 and detachment of the disk from the turntable 10 can be executed. When a braking force is applied to the driving body, from a state that the disk is loaded on the turntable 10 and the turntable 10 is rotate in the α2 direction, the pin 31b is relatively moved in the oblong hole 17 in the α1 direction, the holding member 21 is rotated in a β1 direction, and the disk can be held between the holding member 21 and the turntable 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotation drive for rotating various disks such as CDs, DVDs, and magneto-optical disks, and more particularly to a disk rotation drive capable of self-chucking a disk without providing a clamper.

[0002]

2. Description of the Related Art Some disk rotation driving devices for clamping a disk such as a CD include a turntable and a clamper for pressing the disk against the turntable. However, since this disk rotation drive device rotates the disk while sandwiching the disk between the turntable and the clamper, the overall thickness dimension increases, and furthermore, when the disk is introduced or ejected, the clamper is used. Since a space is required to be separated from the turntable, there is a limit in responding to a reduction in the thickness of the device.

There is a so-called self-chucking type in which a disk holding means is provided on a turntable. In this self-chucking type turntable, a pressurizing body such as a sphere or a claw is provided at a central protruding portion, and the pressurizing body is elastically pressed into a center hole of the disk, The disc is held on the turntable.

[0004]

In the disk rotating drive having the self-chucking type turntable, it is necessary to forcibly press the disk against the turntable when installing the disk on the turntable. Further, when the disk is detached from the turntable, it is necessary to forcibly detach the disk from the disk holding means.

Therefore, in a disk device in which a disk is loaded and unloaded by hand, a strong force is required to press the disk against the turntable and to release the disk, and the loading and unloading operations are complicated.

Further, in the auto-loading type disk device in which the disk is fed by means such as a roller in the housing, the self-chucking type turntable is used. It is necessary to provide a mechanism and a release mechanism to release the disk from the turntable,
The structure inside the housing becomes extremely complicated.

The present invention has been made to solve the above-mentioned conventional problems, and uses a self-chucking table having no clamper so that a disk can be easily loaded and unloaded from the table. It is intended to provide a device.

[0008]

SUMMARY OF THE INVENTION The present invention provides a drive shaft, a table which rotates integrally with the drive shaft and supports a lower surface of a disk, and a disk which is rotatably supported by the table and which is supported by the table. Holding member, a driving body rotatably provided with respect to the drive shaft, and braking means for applying a braking force to the driving body, between the driving body and the holding member When the drive shaft and the table rotate while applying a braking force to the drive body,
A connection means for rotating the holding member from a retreat position located in the center hole of the disk to a holding position for holding the disk is provided.

In the disk rotation driving device of the present invention, when the table is rotated in any direction while applying a braking force to the driving body, the disk can be held by the table and the holding member, and the table can be moved in the opposite direction. When rotated, the holding of the disk by the holding member can be released.

[0010] For example, the driving body is a first plate rotatably provided on the driving shaft below the table, and the braking means includes a second plate pressed against the first plate. And a restraining member that provides a restraining force to the second plate.

For example, the constraining member is a moving base mounted with a reading and / or writing head and moving along the disk. When the moving base moves to the inner peripheral side of the disk, the moving base moves. The second plate is restrained by the base.

However, the braking means may apply a braking force to the driving body by directly pressing the moving base or another restraining member against the driving body (first plate). Good.

[0013] The connecting means is a pin provided on the driving body, and when the table is rotated with a braking force applied to the driving body, the holding member on the table is connected to the holding member. It is rotated by a pin. Alternatively, a structure in which a link mechanism or a cam mechanism is provided between the driving body and the holding member, and the holding member is rotated by the driving body may be adopted.

Preferably, the holding member is urged by a spring so as to rotate toward the holding position.

When the holding member is urged to the holding position,
When the braking force to the driver is released and the table is rotated, the holding member is always located at the holding position, and the holding of the disk is stabilized.

In this case, a braking means for applying a braking force to the table when a braking force is applied to the driving body from the braking means to rotate the table and rotate the holding member to the retracted position. Is preferably provided.

For example, the brake means is a control section for generating a braking force on a motor for driving the drive shaft.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing a disk rotation drive device according to the present invention, FIG. 2 is an exploded perspective view of the disk rotation drive device, and FIG. 3 is a plan view of the disk rotation drive device.
(A) shows a disk holding state, and (B) shows a disk holding release state. FIG. 4 is a side view showing a disk rotation driving device and a head mechanism.

As shown in FIGS. 1 and 2, the disk rotation driving device 1 includes a rotation table 10, a disk holding mechanism 20, a braking means 30, and a driving motor M having a driving shaft M1.

The turntable 10 is made of a synthetic resin material or a non-magnetic metal material. A protrusion 11 is provided at the center of the turntable 10 to be inserted into a center hole D1 of the disk D. A flange portion 12 is integrally formed around the base end of the portion 11, and a disk receiving portion 13 for receiving the surface of the disk D is formed on the upper surface of the outer peripheral portion of the flange portion 12.

A shaft hole 14 is formed at the center of the projection 11. The shaft hole 14 is provided with a drive shaft M1 of the drive motor M.
Is inserted and fixed to the distal end portion by press-fitting or the like. Therefore, when rotation is given to the drive shaft M1, the turntable 10 rotates together.

Openings 15, 15, 15 are formed on the circumferential side surface of the protrusion 11 at every equally divided angle in the circumferential direction (every 120 degrees in the present embodiment). Also, inside the protruding portion 11, the flange portion 12 of the turntable 10 is provided at every equally divided angle in the circumferential direction.
Support shafts 16, 16, 16 extending from the support member 16, and long holes 17, 17, 1 penetrating the flange portion 12 in the plate thickness direction.
7 are provided (see FIG. 3).

The disk holding mechanism 20 includes a holding member 2
1 and an urging member 22. The holding member 21 is formed of a synthetic resin material or the like.
A hole 21b serving as a rotation fulcrum and a locking portion 21c are provided. The holding member 21 is configured such that the hole 21 b is
And is rotatably supported so that the holding claws 21 a can protrude from the opening 15. The holding claw 21
The width dimension W of a is formed sufficiently smaller than the opening width dimension of the opening 15 so that it can protrude and retreat within the gap of the opening 15. The state in which the holding claws 21a protrude from the opening 15 is the disc D.
Is a holding position in which the holding claw 21a is
1 is a retreat position located inside the center hole D1 of the disc D when retreating inside the disc D.

The biasing member 22 is made of, for example, a torsion coil spring, and has a winding portion 22c wound in a coil shape and hooking arms 22a and 22b extending from both ends thereof.
The winding portion 22 c of the urging member 22 is inserted outside the support shaft 16 and is located below the holding member 21. One of the latching arms 22a of the biasing member 22 is latched on the inner peripheral wall surface of the projection 11, and the other latching arm 22b is latched on a part of the holding member 21. The holding member 21 is constantly urged in a direction to protrude outside the opening 15.

The braking means 30 includes a disk holding mechanism 2
0, and a second plate (braking member) pressed against each other via a frictional resistance between the first plate 31 (driving body) and the first plate 31.
32.

The first plate 31 has a ring shape, and a drive shaft M1 is inserted through a center hole 31a of the first plate 31, so that the first plate 31 can rotate freely with respect to the drive shaft M1. It is in. On the upper surface of the first plate 31, a switching pin 31 serving as a connecting member is provided at every angle equally divided in the circumferential direction (in this embodiment, every 120 degrees).
b, 31b, 31b are fixed integrally. And
The tip of the switching pin 31b in the illustrated Z1 direction is inserted into each of the long holes 17 formed in the area of the protrusion 11 of the rotary table 10, and the rotary table 1
When the 0 and the first plate 31 rotate relative to each other, the switching pin 31b can move in the circumferential direction of the slot 17 in the circumferential direction (the α1 and α2 directions in the drawing).

The second plate 32 has a concave shape, and a through hole 32a is formed in the center of the bottom surface. The drive shaft M1 of the drive motor M is inserted into the through hole 32a, and the second plate 32 can freely rotate with respect to the drive shaft M1.

The first plate 31 includes the drive shaft M
The shaft 1 does not move in the axial direction, and is rotatable with respect to the drive shaft M1. A ring (not shown) is fitted into the lower end of the drive shaft M1, a compression coil spring is provided between the ring and the second plate 32, and the second plate 32 is constantly urged upward. The bottom surface of the recess of the second plate is constantly pressed against the first plate 31.

Between the bottom surface of the first plate 31 and the top surface of the second plate 32, there is provided a sliding means for generating a frictional resistance in the rotational direction (along the directions α1 and α2). Therefore, when no external force is applied to the second plate 32, the first plate 31 and the second plate 32 rotate integrally, and apply a restraining force to the second plate, thereby causing the rotary table 10 to rotate. When rotated, a slip occurs between the first plate 31 that rotates together with the turntable 10 and the second plate 32 that is receiving the binding force.

The center hole 3 of the first plate 31
A bearing member may be provided in the through hole 32a of the first plate 1a and the second plate 32 so that the first plate 31 and the second plate 32 can freely rotate around the drive shaft M1 by the bearing member.

The restricting member for applying the restricting force to the second plate 32 can be constituted by a lever or a slider which is fitted to the second plate 32 or presses the second plate 32. It is possible to use a head mechanism.

In the example shown in FIG. 4, a head mechanism 50 is provided near the disk drive 1. The head mechanism 50 includes a pair of guide shafts 5 provided in parallel.
The moving base 51 supported between the two can be moved in the radial direction of the disk D by receiving a transfer force of a screw shaft (not shown) or the like. An optical head or a magneto-optical head having an objective lens 53 is provided on the moving base 51, and a disk D mounted on the rotary table 10 is provided.
And data read from the disk D can be read. In the head mechanism 50, a part of the moving base 51 is moved to the innermost position (the position closest to the drive shaft M <b> 1) by moving the moving base 51 serving as a restraining member, so that the second plate 32 is moved. The second plate 32 can be restrained by being in contact with the outer peripheral surface or by fitting the concave and convex.

The braking means 30 may be of any type as long as it applies a braking force to the first plate 31. For example, the braking means 30 does not include the second plate 32, but includes a moving base 51 and the like. A sliding friction member such as a leaf spring or felt attached to the
The outer peripheral side surface of the first plate 31 may be directly elastically pressed to apply a braking force to the first plate 31.

As shown in FIG. 2, a disk drive on which the disk rotation drive device 1 is mounted includes a control unit 61.
And a mounting detection unit 62. The control unit 61 controls the number of rotations and the direction of rotation of the motor, controls a brake current that applies a braking force to the rotor of the motor, and controls the head mechanism 50.
Detects whether the disk D is mounted on or disengaged from the rotary table 10.

The operation of the disk drive will be described. (Operation before mounting disc) As shown in FIG.
When the disk D is not placed on the rotary table 10, that is, when the disk rotation driving device 1 is in a non-driving state, the other locking arm 22 b of the urging member 22 is moved to the holding member 21.
In the illustrated β1 (counterclockwise) direction. For this reason, the switching pin 31b is pressed in the illustrated β1 (counterclockwise) direction by the locking portion 21c of the holding member 21, and is located at the end of one of the long holes 17 in the one rotation direction (α1 direction: clockwise). . Accordingly, the holding member 21 is
1a is set at a holding position protruding from the opening 15 of the protrusion 11. That is, the disk rotation drive 1
Is in a non-drive state, the disk D cannot be loaded on the turntable 10.

(Operation at Loading of Disk) For example, when the disk device on which the disk rotation drive device 1 is mounted is an auto-loading type, when the disk D is inserted into the entrance of the disk device, The controller 61 drives the disk transport means (see FIG. 5), and the disk D is transported to a position above the turntable 10.

While the disk is being transported, the controller 6
By the control operation of (1), the moving base 51 of the head mechanism 50 is moved to the innermost position, and the moving base 51 comes into contact with the second plate 32, and the second plate 32
Is restrained. The second plate 32 is the first plate 3
At this point, the first plate 31 is also restrained because it is pressed against the first plate 31 by a spring.

Then, as shown in FIG. 3 (B), a drive current is given to the drive motor M by the control unit 61, and the drive shaft M1 is rotated in the α1 direction (clockwise direction) in the figure. At the beginning of the rotation, the braking force is applied to the first plate 31, and the first plate 31 remains, so that when the turntable 10 rotates clockwise, the switching pin 31b is stopped. Holding projection 2 in the state
1 moves in the illustrated α1 direction. Therefore, the holding member 21 is rotated in the β2 direction by the switching pin 31b, and the holding claw 21a moves into the projection 11 and is set to the retreat position. After that, the first plate 31 rotates together with the turntable 10, and a slip occurs between the second plate 32 and the first plate 31 that are restrained by the moving base 51. Therefore,
The overvoltage applied to the drive motor M can be extremely small as compared with the case where the first plate 31 is directly restrained.

When the rotary table 10 is rotated by a slight angle, that is, by an angle sufficient for the holding claw 21a to retreat, a brake current is applied to the drive motor M, and a brake is applied to the drive shaft M1 and the rotary table 10. Is given, the rotation of the drive shaft M1 is stopped, and the drive shaft M1 is kept from rotating by the braking force of the motor. On the other hand, since the second plate 32 is continuously restrained by the moving base 51, even if an urging force is applied to the holding member 21 from the urging member 22,
The rotating table 10 does not inadvertently idle with respect to the first plate 31 in the α1 direction, and the retreating posture of the holding member 21 shown in FIG. 3B is maintained.

Then, in the state shown in FIG. 3B, the center hole D1 of the disk D is externally inserted into the projection 11 and mounted on the disk receiving portion 13. The mounting of the disk D on the turntable 10 is detected by the mounting detecting means 62.

When the control unit 61 recognizes the disc mounting state by the detection of the mounting detecting means 62, the control unit 61 controls the driving motor M with the moving base 51 restraining the second plate 32. Starts and the drive shaft M
1 and the turntable 10 are reversed in the α2 direction. Also at this time, a slip occurs between the second plate 32 and the first plate 31, and the long hole 17 rotates in the α2 direction with respect to the switching pin 31b. As a result, the switching pin 31b
As a result, the holding member 21 is forcibly rotated in the counterclockwise direction (β1 direction) so that the periphery of the center hole D1 of the disc D
1 a and the rotary table 10.

Thereafter, the moving base 51 moves toward the outer periphery of the disk, and the restraining force on the second plate 32 is released. Then, the drive motor M is driven in the α1 direction, and the turntable 10 is rotated in the clockwise direction (α1 direction). At this time, since the holding member 21 is stabilized at the holding position by the urging member 22, the holding of the disk D is maintained. Then, the disk D is rotated together with the turntable 10 in the α1 direction. At this time, the first plate 31 and the second plate 32 that are in the free state rotate together in the α1 direction.

Then, the moving base 51 is moved in the radial direction of the disk D by the control unit 61 to read data information of the disk D and write data to the disk D.

(Operation at the time of disk detachment) When the stop button provided on the disk device is pressed, the drive motor M stops and the rotation table 10 stops while the disk D is held. Further, when an eject button (not shown) for ejecting a disc is pressed, the controller 6
1, the moving base 51 is moved to the innermost peripheral position and abuts on the second plate 32, and the second plate 32
Is given a binding force. Then, the rotary table 10 is rotated in the α1 direction by the drive motor M, and a slip occurs between the first plate 31 and the second plate 32,
When the holding member 21 moves in the α1 direction with respect to the switching pin 31b, the holding member 21 rotates in the β2 direction,
The evacuation position is set as shown in FIG. Also at this time, the brake current is given to the drive motor M,
The state of FIG. 3B is maintained.

The holding of the disk D is released by the retraction of the holding claws 21a of the holding member 21 into the center hole D1 of the disk D. Thereafter, the disk D is lifted from the rotary table 10 by the disk transport means. Is discharged.

FIG. 5 shows an example of the configuration of a disk device provided with the disk rotation drive device.

The disk device shown in FIG. 5 is of an auto-loading type (slot-in type), and has an insertion / ejection opening 70 a at the front of a housing 70. The disk rotation driving device 1 is installed inside the housing 70.
Inside the insertion / ejection port 70a, a transfer roller 71,
A guide pad 73 made of resin is fixed above the transfer rollers 71, 72.

When the disc D is inserted from the insertion / ejection port 70a while the transfer rollers 71, 72 are moving upward, the disc D is sandwiched between the transfer rollers 71, 72 and the guide pad 73. Is transferred to the inner side of the housing 70 by the rotational force of the transfer roller 71. That is, the transport rollers 71 and 72 and the guide pad 73 constitute a disk transport unit.

The transferred disk D is positioned by a positioning member (not shown) when the center hole D1 moves to a position facing the projection 11 of the disk rotation drive 1. At this time, the transfer rollers 71 and 72 are lowered, the center hole D1 of the disk D is inserted into the protrusion 11, and the disk D is set on the disk receiving portion 13.

When the mounting detecting means 62 detects that the disk D has been set on the disk receiving portion 13, the drive shaft M 1 starts, and the disk D is held on the rotary table 10 by the holding member 21. Will be retained.

The disk rotation driving device 1 of the present invention
May be one selected from a plurality of discs, transported, and transported onto the turntable 10.

[0053]

According to the present invention, the disk can be held on the table and the holding can be released only by rotating the table by applying a braking force to the driving body (first plate). be able to. Therefore, the holding and release of the disk with respect to the table can be performed simply and reliably without the clamper.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an embodiment of a disk rotation drive device of the present invention;

FIG. 2 is an exploded perspective view of a disk rotation driving device.

FIG. 3 is a plan view of a disk rotation drive device, and FIG.
Indicates a disk holding state, (B) indicates a disk holding released state,

FIG. 4 is a side view showing a disk rotation drive device and a head mechanism;

FIG. 5 is a diagram illustrating a configuration example of a disk device including a disk rotation drive device;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk rotation drive device 10 Rotary table 11 Projection 15 Opening 16 Support shaft 17 Slot 20 Disk holding mechanism 21 Holding member 21a Holding claw 22 Energizing member 30 Braking means 31 First plate (driving body) 31b Switching pin 32 Second plate (braking member) 50 Head mechanism 51 Moving base (restraining member) 61 Controller D Disk M Drive motor M1 Drive shaft

Claims (7)

[Claims] A drive shaft, a table that rotates integrally with the drive shaft and supports a lower surface of a disk, a holding member that is rotatably supported by the table and holds the disk with the table, A driving body rotatably provided with respect to a driving shaft; and a braking means for applying a braking force to the driving body. A braking force is applied to the driving body between the driving body and the holding member. And a connecting means for rotating the holding member from a retreat position located in the center hole of the disk to a holding position for holding the disk when the drive shaft and the table rotate in a state provided with A disk rotation drive device characterized by the above-mentioned. 2. The drive unit is a first plate rotatably provided on the drive shaft below the table, wherein the braking unit includes a second plate pressed against the first plate. 2. The disk rotation driving device according to claim 1, further comprising: a restricting member that applies a restricting force to the second plate. 3. The constraining member is a moving base mounted with a reading and / or writing head and moving along the disk. When the moving base moves to the inner peripheral side of the disk, the moving member moves. Said second by base
3. The disk rotation driving device according to claim 2, wherein the plate is restrained. 4. The connecting means is a pin provided on the driving body, and when the table is rotated in a state in which a braking force is applied to the driving body, the holding member on the table turns the holding member on the table. 4. The disk rotation drive device according to claim 1, wherein the disk rotation drive device is rotated by a pin. 5. The disk rotation driving device according to claim 1, wherein the holding member is biased by a spring to rotate toward the holding position. 6. A braking means for applying a braking force to the table when a braking force is applied to the driving body from the braking means to rotate the table and rotate the holding member to the retracted position. 6. The disk rotation drive device according to claim 5, wherein the disk rotation drive device is provided. 7. The disk rotation drive device according to claim 6, wherein the brake unit is a control unit that generates a braking force on a motor that drives the drive shaft.