JPH09180225A - Disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust skew angle without providing a DC motor, a gear train, etc., for skew angle adjustment of an optical pickup. SOLUTION: This device is provided with an optical pickup 11 on a pair of guide shafts 12 and 13, and reads signal on the signal recording surface of an optical disk 4 with the optical pickup 11 by moving the optical pickup 11 along the guide shafts 12 and 13 in the radial direction of the optical disk 4 supported by a turntable 14. End parts of a pair of the above guide shafts 12 and 13 are held by bearings 21 so that the shafts are inclinable in the radial direction of the optical disk 4, and the other ends are coupled with each other by a movable block 22. The movable block 22 is ascendable and descendable by means of a movable block driving mechanism 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device such as an optical disk drive device and a magneto-optical disk drive device, which uses an optical pickup (hereinafter referred to as an optical pickup) to read signals and record signals. is there.

[0002]

2. Description of the Related Art In an optical disk drive device, an optical pickup is mounted on a pair of guide shafts, and the optical pickup is moved along the guide shafts in the radial direction of an optical disk supported by a turntable. The light beam of the optical pickup is applied to the signal recording surface of the optical disc to take out the signal recorded on the signal recording surface.

The optical pickup is mounted on the guide shaft so that the optical axis of the light beam is at right angles to the signal recording surface of the optical disc, but the optical disc has distortion and warpage. The optical axis cannot always be kept at right angles to the signal recording surface.

Therefore, the conventional disk drive device is
The optical pickup is provided with a skew sensor, a DC motor for adjusting the skew angle, a gear train, etc., and the skew sensor detects the tilt of the optical pickup with respect to the optical disc, and drives the DC motor based on the detection output. The inclination of the pickup with respect to the optical disc is corrected, and the light beam of the optical pickup is applied to the signal recording surface of the optical disc at a skew angle within a predetermined tolerance.

[0005]

By the way, the above-mentioned conventional disk drive device has the following problems because the optical pickup is provided with the DC motor and the gear train for adjusting the skew angle as described above. was there.

(1) The structure of the optical pickup becomes complicated. Moreover, since the size of the optical pickup becomes large, it becomes difficult to miniaturize the disk drive device. (It is difficult to apply to a compact CD player or the like.) (2) Since the weight of the optical pickup becomes large, it is not suitable for so-called high-speed access.

According to the present invention, an optical pickup is not provided with a DC motor or a gear train for adjusting a skew angle,
The skew angle can be adjusted to solve the above conventional problems.

[0008]

According to the present invention, an optical pickup is mounted on a pair of guide shafts, and the optical pickup is moved along the guide shafts in a radial direction of an optical disk supported by a turntable. In the disk drive device, the optical beam of the optical pickup is applied to the signal recording surface of the optical disk to extract the signal recorded on the signal recording surface. In order to be tiltable in the radial direction, one end of the guide shaft is supported by a pivot bearing, the other end is connected by a movable block, and the movable block is moved up and down by a block drive mechanism to form the pair of guide shafts, Pick up the pickup mounted on these guide shafts in the radial direction of the optical disc. By tilting and to perform radial skew angle adjustment of the optical pickup.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a disk drive device of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the external appearance of the disk drive device 1. The disk drive device 1 includes a housing 2 and a tray 3 attached to the housing 2 so as to be removable. And
When the optical disk 4 is placed on the tray 3 and the tray 3 is inserted into the housing 2, the optical disk 4 is chucked on the turntable in the housing 2.

FIG. 2 is a perspective view showing a main part of the disk drive device 1. The optical pickup 11 includes the first and second
Mounted on guide shafts (hereinafter, referred to as main guide shaft and sub guide shaft) 12 and 13. The optical pickup 11 moves along the main guide shaft 12 and the sub guide shaft 13, and reads the signal recorded on the signal recording surface of the optical disc 4 supported on the turntable 14. .

As shown in FIGS. 3 to 4, one end of each of the main guide shaft 12 and the sub guide shaft 13 is supported by bearings 21 and 21 so as to be tiltable in the radial direction of the optical disk 4. In addition, the other end is connected by the movable block 22.

The bearing 21 is constructed as a pivot ball bearing, and by fitting the conical surfaces 12a, 13a at one end of the main guide shaft 12 or the sub guide shaft 13, the main guide shaft 12 or the sub guide shaft 13 is fitted. The guide shaft 13 is supported so as to be tiltable.

The movable block 22 is formed in a rectangular parallelepiped shape and has bearing holes 22a, 22 at both ends in the length direction.
b, and the other end portions of the main guide shaft 12 and the sub guide shaft 13 are inserted into these bearing holes 22a and 22b, so that the main guide shaft 1
2 and the other end of the sub guide shaft 13 are integrally connected.

The movable block 22 is formed by a pair of block guides 23a and 23b provided on the chassis 23,
It is designed to be guided up and down by sandwiching both side surfaces in the length direction, and one side portion is pressed by a pair of preload springs 24, 24, and the tips of the main guide shaft 12 and the sub guide shaft 13 are pushed. The conical surfaces 12a and 13a are pressed against the bearings 21 and 21. The movable block 22 is driven up and down by a movable block drive mechanism 31 described below.

The movable block drive mechanism 31 includes a motor 32 for adjusting a skew angle, an eccentric cam 33 rotated by the motor 32, and an interlocking operation for moving the movable block 22 up and down in association with the rotation of the eccentric cam 33. And part 34.

As shown in FIGS. 5 to 6, the eccentric cam 33 is formed in a true circle having a diameter D, and the skew angle adjusting motor 32 is located at a position eccentric from the center position of the true circle. The rotary shaft 32a is attached. Further, the interlocking operation section 34 is configured by providing a horizontally long rectangular cam fitting hole in the central portion of the movable block 22. The vertical diameter H of the interlocking operation portion 34 is formed to be substantially the same as the diameter D of the eccentric cam 33. When the eccentric cam 33 is fitted, the upper and lower ends 33a, 33b of the eccentric cam 33 are , And the upper and lower surfaces 34a and 34b.

FIG. 7 is a plan view of a main part, and a motor 41 for driving a pickup is attached to the chassis 23. The motor 41 for driving the optical pickup is
The pinion 43 is rotated via the gear train 42. The pinion 43 meshes with a rack 45 provided on one side of the slide base 44 on which the optical pickup 11 is mounted. Further, the optical pickup 11 is provided with a skew sensor 46. 47
Is an objective lens of the optical pickup 11.

The disk drive device 1 of the embodiment has the above-mentioned structure, and when the skew sensor 46 detects the tilt of the optical disk 4 in the radial direction, a motor for adjusting the skew angle according to the tilt of the optical disk 4. 32
The eccentric cam 33 is rotated by. The movable block 22 moves up and down by the rotation of the eccentric cam 33, the main guide shaft 12 and the sub guide shaft 13 are inclined, and the main guide shaft 12 and the sub guide shaft 1
The optical pickup 11 attached to the optical disc 3 is tilted so that the optical axis of the light beam emitted from the objective lens 47 is applied perpendicularly to the signal recording surface of the optical disc 4.

In the embodiment, the optical disc drive device is shown as the disc drive device, but the present invention is also applied to the magneto-optical disc drive device.

[0020]

The disk drive device of the present invention has the following effects.

(1) In the disk drive device of the first aspect, one end portion of the pair of guide shafts is supported by a bearing so as to be tiltable in the radial direction, and the other end portions of the pair of guide shafts are connected by a movable block. By raising and lowering the movable block by the block drive mechanism, the guide shaft is tilted so that the optical axis of the optical pickup is vertically applied to the optical disc. It is not necessary to provide a DC motor, a gate tray, or the like, and the optical pickup can be made smaller and lighter to facilitate high speed access.

(2) In the disk drive device of the second aspect, since one end of the guide shaft is supported by the pivot bearing, the guide shaft can be easily and smoothly tilted.

(3) According to another aspect of the disk drive device of the present invention, a skew angle adjusting motor, an eccentric cam rotated by the motor, and an inner peripheral surface of the eccentric cam pressed by the rotation of the eccentric cam to move the movable block up and down. Since the movable block drive mechanism is configured with the interlocking operation unit, the movable block can be surely moved up and down by a simple operation of rotating the eccentric cam by the motor.

(4) In the disk drive device according to the fourth aspect, the interlocking operation part is formed by providing a horizontally elongated rectangular cam fitting hole in the central part of the movable block, and the interlocking operation part is longitudinally formed. Since the diameter is formed to be substantially the same as the diameter of the eccentric cam, when the eccentric cam is fitted into the interlocking operation part, the upper and lower ends of the eccentric cam come into contact with the upper and lower surfaces of the interlocking operation part. The movable block is positioned and moves up and down following the rotation of the eccentric cam.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the external appearance of a disk drive device.

FIG. 2 is a perspective view of a main part.

FIG. 3 is an exploded perspective view of a main part.

FIG. 4 is a sectional view of a bearing.

FIG. 5 is a front view of a movable block drive mechanism.

FIG. 6 is a front view of a movable block drive mechanism.

FIG. 7 is a plan view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc drive device 4 ... Optical disc 11 ... Optical pickup 12 ... Main guide shaft 13 ... Sub guide shaft 14 ... Turntable 21 ... Bearing 22 ... Movable block 31 ... Movable block drive mechanism 32 ... Skew angle adjusting motor 33 ... Eccentricity Cam 34 ... Interlocking operation part (cam fitting hole)

Claims (4)

[Claims] 1. An optical pickup is mounted on a pair of guide shafts, and the optical pickup is moved along the guide shafts in the radial direction of a disk supported by a turntable. In a disc drive device adapted to read a signal on a signal recording surface of the disc, the pair of guide shafts are tiltable in a radial direction of the disc, one end of which is supported by a bearing and the other end of which is movable. A disk drive device, wherein the movable blocks are connected to each other by blocks, and the movable blocks can be raised and lowered by a movable block drive mechanism. 2. The bearing supporting one end portion of a pair of guide shafts according to claim 1,
Disk drive device composed of pivot bearings. 3. The movable block drive mechanism according to claim 1, wherein the motor for skew angle adjustment, the eccentric cam rotated by the motor, and the inner peripheral surface pressed by the rotation of the eccentric cam are movable. A disk drive device composed of an interlocking operation unit that raises and lowers a block. 4. The eccentric cam according to claim 3, wherein the eccentric cam is formed in a circular shape, and the interlocking operation portion is formed by providing a horizontally long rectangular cam fitting hole in a central portion of the movable block. A disk drive device having a vertical diameter substantially equal to the diameter of the eccentric cam.