JP2002367300A - Optical pickup feed mechanism and disk drive device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To simplify a mechanism by reducing the number of parts and improve the reliability of operation. A moving base (28) of an optical pickup (27).
A rotating body 13 rotatably supported by the chassis 3 and having a disk-shaped rotor 15 and a gear portion 18 rotated with the rotation of the rotor and meshed with the rack; An ultrasonic motor 1 disposed on a chassis and having a vibrator 22, which vibrator is pressed against the peripheral surface of the rotor to apply a rotational force to the rotor.
4, a direction X connecting the rotation center of the rotating body to the meshing position of the gear portion with the rack, and a direction Y connecting the rotation center of the rotating body to the contact position of the ultrasonic motor with the rotor.
And in different directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of a feed mechanism of an optical pickup and a disk drive. More specifically, the present invention relates to a technical field of a feed mechanism of an optical pickup using an ultrasonic motor and a disk drive device including the same.

[0002]

2. Description of the Related Art There is a disk drive device for recording and reproducing information signals on and from a disk-shaped recording medium. Such a disk drive device sends a disk-shaped recording medium mounted on a disk table in a radial direction by a feeding mechanism. Optical pickup.

In a conventional disk drive device,
A main shaft is rotatably supported on the chassis via a bearing member, and a sub shaft is mounted on the chassis via another bearing member. A pair of bearing portions provided at both ends of the moving base of the optical pickup are respectively a main shaft. And the counter shaft are slidably supported. A lead screw rotatably supported by a bearing member is used as the main shaft, and a nut member attached to the moving base is screwed to the lead screw.

When a lead screw is rotated by a stepping motor or a DC motor used as a feed motor, a nut member is fed in accordance with the rotation direction, and an optical pickup is guided by a main shaft and a sub shaft to form a disk-shaped recording medium. Is moved in the radial direction.

[0005]

However, in the conventional disk drive, since the stepping motor and the DC motor use coils and magnets, they become large and hinder the thinning of the disk drive. Have come.

It is also necessary to reduce the sliding loss between the pair of bearings provided on the moving base and the main shaft or the sub shaft, and to ensure the operation reliability by improving the accuracy.

It is therefore an object of the present invention to provide a feed mechanism and a disk drive device for an optical pickup which overcome the above-mentioned problems and which achieves simplification of the mechanism by reducing the number of parts and reliability of operation.

[0008]

According to the present invention, there is provided a feed mechanism and a disk drive device for an optical pickup, which are rotatably supported on a rack provided on the moving base and a chassis to solve the above-mentioned problems. A rotating body having a disc-shaped rotor and a gear portion rotated with the rotation of the rotor and meshed with the rack; and a vibrator disposed on a chassis and having a vibrator, wherein the vibrator is a peripheral surface of the rotor. An ultrasonic motor that applies a rotational force to the rotor by being pressed against the rotor, the direction connecting the rotation center of the rotating body and the meshing position of the gear portion with the rack, and the rotation center of the rotating body and the ultrasonic motor relative to the rotor. The direction connecting the contact position is different from the direction.

Therefore, in the feed mechanism and the disk drive device of the optical pickup according to the present invention, when the rotor of the rotating body is provided with a rotational force from the vibrator, the gear section is rotated, and the optical pickup is turned into a disk-shaped recording medium. Is moved in the radial direction.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an optical pickup according to an embodiment of the present invention;

The disk drive device 1 has required members and mechanisms arranged in an outer casing 2 (see FIG. 1).
The outer casing 2 has a horizontally long opening (not shown) for inserting a disc.

A chassis 3 is disposed in the outer casing 2, and a spindle motor 4 is attached to a substantially central portion of the chassis 3. A disk table 5 is fixed to a motor shaft of the spindle motor 4.

The shaft support members 6, 6 are provided at one end of the chassis 3.
Are mounted separately from each other, and a sub shaft 7 is supported between the shaft support members 6. Pressing springs 8, 8 are attached to the shaft supporting members 6, 6, respectively, and a part of the pressing springs 8, 8 is elastically contacted with both ends of the sub shaft 7 (see FIG. 2). The backlash of No. 7 is prevented.

The other end of the chassis 3 has shaft support members 9 and 9
Are mounted separately from each other, and a main shaft 10 is supported between the shaft support members 9. Pressing springs 11, 11 are attached to the shaft supporting members 9, 9, respectively. A part of the pressing springs 11, 11 is elastically contacted with both ends of the main shaft 10 (see FIG. 1). Rattling is prevented.

A feed mechanism 12 is provided at the other end of the chassis 3, and the feed mechanism 12 includes a rotating body 13 and an ultrasonic motor 14 (see FIGS. 1 and 3).

The rotating body 13 includes a rotor 15 and a gear body 16 and is rotatably supported by a support shaft 3a provided on the chassis 3 (see FIGS. 4 and 5). Rotor 15
Is provided with a detent protruding edge 15a protruding upward.

The gear body 16 is formed by integrally forming a disk-shaped base portion 17 and a gear portion 18 provided on the base portion 17, and a detent that opens downward to the base portion 17. Recess 1
7a are formed.

Ball bearings 19, 19 are press-fitted into the support shaft 3a of the chassis 3, and the ball bearings 19, 19
The rotor 15 is rotatably supported between 19. The gear body 16 is disposed above the upper ball bearing 19, and a washer 20 is attached to the upper end of the support shaft 3a. The non-rotating protruding edge 15a of the rotor 15 is
The gear body 16 is integrally rotated with the rotation of the rotor 15.

The ultrasonic motor 14 has a vibrator 22 supported on a base member 21 (see FIGS. 4, 6 and 7).

The base member 21 is formed by integrally forming a base 23 and a projection 24 projecting upward from one end of the base 23. The base portion 23 has a shaft portion 23a protruding upward.
And an insertion notch 23b opened on one side.
Are formed. The base member 21 has a notch 2 for insertion.
An arrangement notch 24a opened on the side opposite to 3b is formed. The vibrator 22 has an annular shape, and is supported by the base member 21 by inserting the shaft portion 23a into an insertion hole 22a formed in the center.

The chassis 3 is provided with a cut-and-raised stopper piece 3b near the support shaft 3a.
A spring support protrusion 3c is provided on the opposite side of the support shaft 3a with respect to (see FIG. 7).

The ultrasonic motor 14 is arranged between the stopper piece 3b of the chassis 3 and the spring supporting projection 3c. The ultrasonic motor 14 is arranged on the chassis 3 with the stopper piece 3b located in the insertion notch 23b of the base member 21 and the spring support protrusion 3c located in the arrangement notch 24a. In the state where the ultrasonic motor 14 is arranged as described above, the coil portion 25a of the torsion coil spring 25 is supported by the spring support protrusion 3c, and the washer 26 is attached to the upper end of the spring support protrusion 3c. The ends 25b and 25c of the torsion coil spring 25 are elastically contacted with the end surfaces of the base member 21, respectively. Therefore,
The ultrasonic motor 14 includes the rotating body 1 supported on the support shaft 3a.
3, and the peripheral surface of the vibrator 22 is pressed against the peripheral surface of the rotor 15 of the rotating body 13 (see FIG. 4).

The optical pickup 27 has a moving base 28, required optical elements arranged on the moving base 28, and a biaxial actuator 29 supported on the moving base 28 (see FIG. 1). The movable base 28 is integrally formed with a U-shaped bearing portion 28a which is opened outward at one end portion thereof (see FIG. 2), and cylindrical bearing portions 28b, 28b are integrally formed at the other end portion. (FIGS. 1 and 3)
reference). A rack 30 is attached to the moving base 28 between the bearing portions 28b, 28b by, for example, screws (see FIG. 1).

The bearing 28a of the movable base 28 is slidably supported by the countershaft 7 (see FIGS. 1 and 2).
b and 28b are slidably supported by the main shaft 10 (see FIGS. 1 and 3).

The gear portion 18 of the rotating body 13 is
And the rotation center of the rotating body 13 and the gear portion 18
A direction X connecting the meshing position of the rotor 30 to the rack 30 and a direction Y connecting the rotation center of the rotating body 13 and the contact position of the vibrator 22 with the rotor 15 are substantially orthogonal to each other (see FIG. 3). That is, the direction in which the gear portion 18 meshes with the rack 30 is orthogonal to the direction in which the vibrator 22 contacts the rotor 15.

When a current is supplied to the vibrator 22 of the ultrasonic motor 14 through the lead wires 22b, 22b,..., The vibrator 22 vibrates, and the vibrator 22 vibrates in the direction of the vibration wave generated in the vibrator 22. The rotor 15 is rotated in a corresponding direction, and the rack 30 meshed with the gear unit 18 rotated with the rotation of the rotor 15 is sent. Accordingly, the optical pickup 27 is guided by the main shaft 10 and the sub shaft 7, and is moved in the radial direction of the disk-shaped recording medium 100 mounted on the disk table 5. At this time, the laser light emitted from the light emitting element provided on the moving base 28 is applied to the disk-shaped recording medium 100 via the objective lens 29a of the biaxial actuator 29 of the optical pickup 27, and the recording or reproduction of the information signal is performed. Will be

As described above, in the disk drive device 1, the vibrator 22 presses the vibrator 22 of the ultrasonic motor 14 against the rotor 15 of the rotator 13 to apply a rotational force from the vibrator 22 to the rotator 13. The optical pickup 27 is moved in the radial direction of the disk-shaped recording medium 100 by feeding the rack 30 meshed with the gear unit 18.

Accordingly, since the ultrasonic motor 14 is used, the size and thickness of the feed mechanism 12 can be reduced. In particular, since the rotating body 13 and the ultrasonic motor 14 are arranged side by side on the chassis 3, the feed mechanism 12 becomes extremely thin.

In the disk drive 1, the direction X connecting the rotation center of the rotating body 13 and the meshing position of the gear portion 18 with the rack 30, the rotation center of the rotating body 13 and the rotor 15 of the vibrator 22. Is substantially orthogonal to the contact position with respect to the gear (see FIG. 3), and the direction in which the gear portion 18 meshes with the rack 30 is different from the direction in which the vibrator 22 contacts the rotor 15. Thus, the load applied to the main shaft 10 from the bearings 28b, 28b is small, and the sliding loss can be reduced.

Further, since the moving base 28 is moved by meshing the gear 18 with the rack 30, the gear 18
By changing the gear ratio between the optical pickup 27 and the rack 30, the moving speed of the optical pickup 27 can be set freely.

In the above, the vibrator 2 of the ultrasonic motor 14
2 shows a case in which a torsion coil spring 25 is used as a pressing means for pressing the rotor 2 against the rotor 15 of the rotating body 13,
For example, the compression coil springs 31, 31 can be used instead of the torsion coil spring 25 (see FIGS. 8 and 9).

The compression coil springs 31, 31 are disposed on a base member 33 of the ultrasonic motor 32, and the ultrasonic motor 3
Reference numeral 2 denotes a base member 33 in which the vibrator 22 is supported. The base member 33 is formed by integrally forming a base 34 and a protrusion 35 protruding upward from one end of the base 34. The base portion 34 is provided with a shaft portion 34a protruding upward, and is formed with an insertion notch 34b opened on one side. On the base portion 34, spring arrangement recesses 34c, 34c extending in the direction in which the optical pickup 27 is moved are formed on opposite sides of the shaft portion 34a, and the spring arrangement recesses 34c, 3c are formed.
4c is opened in the direction opposite to the insertion notch 34b.

The vibrator 22 is supported by the base member 33 by inserting the shaft 34a into the insertion hole 22a. The compression coil springs 31, 31 are arranged in spring arrangement recesses 34c, 34c, respectively.

The cut-and-raised spring receiving piece 3 is provided on the chassis 3 at a position opposite to the support shaft 3a with respect to the stopper piece 3b.
d and 3d are provided.

The ultrasonic motor 32 is arranged between the stopper piece 3b of the chassis 3 and the spring receiving pieces 3d, 3d. The ultrasonic motor 32 is arranged on the chassis 3 with the stopper piece 3b positioned in the insertion notch 34b of the base member 33. Thus, the ultrasonic motor 3
2, the compression coil spring 31,
31, one end portion 31a, 31a is disposed recess 34c,
The other end portions 31b, 31b are resiliently contacted with the spring receiving pieces 3d, 3d while being resiliently contacted with a part of the base member 33 in 34c. Accordingly, the ultrasonic motor 14 is urged in a direction approaching the rotating body 13 supported by the support shaft 3a, and the peripheral surface of the vibrator 22 is pressed against the peripheral surface of the rotor 15 of the rotating body 13.

Thus, even when the compression coil springs 31 are used as the pressing means, a stable pressing force of the vibrator 22 against the rotor 15 can be ensured.

Although the case where the rack 30 is mounted between the bearings 28b and 28b of the moving base 28 has been described above, the rack 30 may be formed integrally with the moving base 28 (see FIG. 10). .

As described above, the rack 30 is moved to the movable base 28.
In this case, the manufacturing cost can be reduced by reducing the number of parts.

The rack 30 with respect to the moving base 28
Is improved, and the reliability of the operation of the optical pickup 27 can be improved.

The specific shapes and structures of the respective parts shown in the above-described embodiments are merely examples for embodying the present invention. The scope should not be construed as limiting.

[0041]

As is apparent from the above description, the feed mechanism of the optical pickup according to the present invention comprises a moving base supported movably in the radial direction of a disk-shaped recording medium mounted on a disk table, and the moving base. A biaxial actuator supported on a base, and a feed mechanism of an optical pickup for feeding an optical pickup guided and moved by a pair of guide shafts attached to a chassis in a radial direction of the disk-shaped recording medium, A rack provided on the moving base, a rotatable body rotatably supported by the chassis and having a disk-shaped rotor and a gear portion rotated with the rotation of the rotor and meshed with the rack; A supersonic wave arranged and having a vibrator, the vibrator being pressed against the peripheral surface of the rotor to apply a rotational force to the rotor; A direction connecting the rotation center of the rotating body and the meshing position of the gear portion to the rack, and a direction connecting the rotation center of the rotating body and the contact position of the ultrasonic motor with the rotor are different directions. Features.

Accordingly, since the ultrasonic motor is used, the feed mechanism can be reduced in size and thickness. In particular,
Since the rotating body and the ultrasonic motor are arranged side by side on the chassis, the feed mechanism becomes extremely thin.

Further, since the direction connecting the rotation center of the rotating body and the meshing position of the gear portion with the rack is different from the direction connecting the rotation center of the rotating body and the contact position of the ultrasonic motor with the rotor, The load applied to the guide shaft from the bearing portion of the moving base is small, and the sliding loss can be reduced.

Further, the moving speed of the optical pickup can be freely set by changing the gear ratio between the gear section and the rack.

According to the second aspect of the present invention, since the rack is formed integrally with the moving base, manufacturing costs can be reduced by reducing the number of parts.

Further, the positional accuracy of the rack with respect to the movable base is improved, and the reliability of the operation of the optical pickup can be improved.

The disk drive apparatus of the present invention has an optical disk having a disk table on which a disk-shaped recording medium is mounted and rotated, and a moving base supported movably in the radial direction of the disk-shaped recording medium mounted on the disk table. A disk drive device comprising a pickup, wherein the optical pickup is guided and moved by a pair of guide shafts attached to a chassis, wherein the optical pickup is rotatably supported by the rack provided on the moving base and the chassis. A rotor having a disk-shaped rotor and a gear portion rotated with the rotation of the rotor and meshed with the rack; and a vibrator disposed on a chassis and having a vibrator, wherein the vibrator is arranged around the rotor. An ultrasonic motor that is pressed against the surface to apply a rotational force to the rotor; A direction connecting the meshing position with respect to click to the direction connecting the contact position of the rotation center and the rotor of the ultrasonic motor of the rotating body, characterized in that the set to a different direction.

Therefore, since the ultrasonic motor is used, the size and thickness of the disk drive device can be reduced. In particular, since the rotating body and the ultrasonic motor are arranged side by side on the chassis, the disk drive becomes extremely thin.

Further, since the direction connecting the rotation center of the rotating body and the meshing position of the gear portion to the rack and the direction connecting the rotation center of the rotating body and the contact position of the ultrasonic motor with the rotor are set to different directions, The load applied to the guide shaft from the bearing portion of the moving base is small, and the sliding loss can be reduced.

Further, the moving speed of the optical pickup can be freely set by changing the gear ratio between the gear section and the rack.

According to the fourth aspect of the present invention, since the rack is formed integrally with the moving base, manufacturing costs can be reduced by reducing the number of parts.

Further, the positional accuracy of the rack with respect to the moving base is improved, and the reliability of the operation of the optical pickup can be improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention together with FIG. 2 to FIG. 10, and FIG. 1 is a schematic perspective view of a disk drive device.

FIG. 2 is an enlarged front view showing a state in which one end of the optical pickup is supported by a sub-shaft with a partial cross section.

FIG. 3 is an enlarged plan view of a feed mechanism.

FIG. 4 is an enlarged perspective view showing a rotating body and an ultrasonic motor.

FIG. 5 is an enlarged exploded perspective view of a rotating body.

FIG. 6 is an enlarged plan view showing a state in which a vibrator of an ultrasonic motor is pressed against a rotor of a rotating body.

FIG. 7 is an enlarged exploded perspective view of the ultrasonic motor.

8 shows an example in which a compression coil spring is used as the pressing means together with FIG. 9, and FIG. 8 is an enlarged plan view.

FIG. 9 is an enlarged exploded perspective view.

FIG. 10 is an enlarged perspective view showing an example in which a rack is integrally formed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk drive device, 3 ... Chassis, 5 ... Disk table, 7 ... Sub shaft (guide shaft), 10 ... Main shaft (guide shaft), 12 ... Feeding mechanism, 13 ... Rotating body, 14 ... Ultrasonic motor, 15 ... Rotor, 18 gear section, 22 vibrator, 27 optical pickup, 28 moving base, 29
... Two-axis actuator, 30 ... Rack, 32 ... Ultrasonic motor, 100 ... Disc-shaped recording medium

Claims (4)

[Claims] 1. A pair of guides mounted on a chassis, comprising a moving base supported movably in a radial direction of a disk-shaped recording medium mounted on a disk table, and a biaxial actuator supported on the moving base. An optical pickup feed mechanism for feeding an optical pickup guided and moved by a shaft in a radial direction of a disk-shaped recording medium, comprising: a rack provided on the moving base; a disk rotatably supported by a chassis; A rotating body having a rotor in the shape of a circle and a gear portion rotated with the rotation of the rotor and meshed with the rack; and a vibrator disposed on a chassis and having a vibrator pressed against the peripheral surface of the rotor. An ultrasonic motor for applying a rotational force to the rotor, and connecting a rotation center of the rotating body to a meshing position of the gear with the rack. Direction, the rotation of the rotational center and the optical pickup feed mechanism, characterized in that it has the a different direction direction connecting the contact position of the rotor of the ultrasonic motor. 2. The feed mechanism of an optical pickup according to claim 1, wherein said rack is formed integrally with a moving base. 3. An optical pickup having a disk table on which a disk-shaped recording medium is mounted and rotated, and an optical pickup having a movable base supported movably in a radial direction of the disk-shaped recording medium mounted on the disk table, A disk drive device in which the optical pickup is guided and moved by a pair of guide shafts attached to a chassis, comprising: a rack provided on the movable base; and a disk-shaped device rotatably supported by the chassis. A rotating body having a rotor and a gear portion rotated with the rotation of the rotor and meshed with the rack; and a vibrator disposed on a chassis and having a vibrator pressed against a peripheral surface of the rotor. An ultrasonic motor for applying a rotational force to the rotor, and connecting a rotational center of the rotating body and a meshing position of the gear to the rack; Disk drive apparatus, wherein the direction that was different direction and the direction connecting the contact position of the rotation center and the rotor of the ultrasonic motor of the rotating body. 4. The disk drive device according to claim 3, wherein said rack is formed integrally with a moving base.