JPH09265646A - Disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the resonance of an optical pickup at the time of high- speed accessing caused by a clearance between a shaft member and a bearing member rotatably mounting the optical pickup on a slide base. SOLUTION: In a disk drive device, an optical pickup 11 is oscillatorily mounted on a slide base 14 by means of a shaft member 12 and a bearing member 13. The slide base 14 is guided so as to make it slidable by means of a pair of guide shafts 16, 17. By providing a cam follower 41 on the optical pickup 11, bringing the cam follower 41 into contact with the eccentric cam part 31 of the guide shaft 16 and rotating the guide shaft 16, the optical pickup 11 is made to oscillate about the shaft member 12 in the direction for adjusting a skew angle through the eccentric cam part 31 and the cam follower 41. The shaft member 12 is formed so as to twist it by means of a spring member, its one end is fixed to the optical pickup 11 and the other end is fixed to the bearing member 13.

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, and the like, and the skew sensor detects the inclination 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.

The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a disk drive device in which resonance or the like is not likely to occur.

[0008]

According to the present invention, an optical pickup is swingably mounted on a slide base by a shaft member and a bearing member, and the slide base is slid and guided by a pair of guide shafts. At the same time, a cam follower is provided in the optical pickup, and the cam follower is brought into contact with the eccentric cam portion of the guide shaft to rotate the guide shaft, whereby the optical pickup receives the shaft member through the eccentric cam portion and the cam follower. In a disk drive device configured to swing in a skew angle adjusting direction around a center, the shaft member is formed by a spring member so as to be twistable and rotatable, and one end of the shaft member is attached to the bearing member with an adhesive or the like. Fixing prevents backlash between shaft member and bearing member.

[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 plan view showing a main part of the disk drive device 1, and FIG. 3 is an exploded perspective view of the main part. The optical pickup 11 includes a pair of shaft members 12 and 12 and a pair of bearing members 13 and 13 so as to be swingable.
4 attached. The shaft members 12 and 12 are formed by a spring material such as phosphor bronze so that they can be twisted and rotated. The shaft members 12 and 12 with one end embedded in the optical pickup 11 are perpendicular to the left and right side surfaces of the optical pickup 11 (planes parallel to the moving direction of the optical pickup 11), that is, the tangential direction. And the other end is attached to the bearing members 13, 13
It is fixed to.

The bearing members 13, 13 are erected on the slide base 14, and V-shaped grooves 13a, 13a are formed on the upper surface thereof, and these V-shaped grooves 13a, 13a are formed. The optical pickup 11 is swingably supported by inserting the ends of the shaft members 12 and 12 and fixing the ends with solder or an adhesive 15.

As shown in FIG. 4, the optical pickup 11
Is attached to the bearing member 13 in an inclined state,
By bringing a cam follower 41, which will be described later, into contact with the cam portion 31 of the main guide shaft 16 and returning it in the horizontal direction (sliding direction), the shaft members 2 and 12 are twisted to store a spring force. .

As shown in FIG. 2, the slide base 1 is provided.
Reference numeral 4 denotes first and second guide shafts (hereinafter, referred to as a main guide shaft and a sub guide shaft) 16, 17
Mounted on these main guide shafts 1
6 and the sub guide shaft 17 are moved in the length direction, and the optical pickup 11 is moved in the radial direction of the optical disk 4 supported by the turntable 18.

The main guide shaft 16 is rotatably driven by a shaft rotation drive mechanism 21. The shaft rotation drive mechanism 21 includes a pinion gear 22 attached to one end of the main guide shaft 16, a worm gear 23 meshing with the pinion gear 22, and a skew angle adjusting motor 24 for rotating the worm gear 23. It consists of The motor 24 is attached to the chassis 25.

As shown in FIG. 3, the main guide shaft 16 has an eccentric cam portion 31 for rotating the optical pickup 11 about the shaft members 12 and 12 by its rotation. The eccentric cam portion 31 is formed by cutting out a part of the peripheral surface of the main guide shaft 16 in a so-called D-cut shape, and includes an arc surface 31a and an eccentric cam surface 31b.

The optical pickup 11 is in contact with the eccentric cam portion 31 provided on the main guide shaft 16 and is pressed by the eccentric cam portion 31, so that the shaft members 12, 12 are provided.
Has a cam follower 41 for rotating the optical pickup 11 in the radial skew angle adjusting direction.

The cam follower 41 is provided on one side surface of the optical pickup 11 substantially in parallel with the shaft member 12. The cam follower 41 is pressed against the eccentric cam portion 31 of the main guide shaft 16 by the spring force of the shaft members 12, 12 as described above. Then, when the main guide shaft 16 is rotated by the shaft rotation driving mechanism 21, the eccentric cam portion 31 presses the cam follower 41, and as shown in FIG. 5, one end side of the optical pickup 11 has a step H range. As shown in FIG. 6, the optical pickup 11 is moved up and down with reference to the horizontal state (state parallel to the sliding direction of the optical pickup) shown by the solid line, and the optical pickup 11 is rotated clockwise or counterclockwise around the shaft member 12. The skew angle is adjusted in the radial direction by swinging in the direction of θ ° (approximately 1 °).

FIG. 7 shows a modification of the shaft member 12. In this modified example, the shaft member 12 is integrally formed with a fixing washer 42 by punching a leaf spring into a T shape, and is fixed to the bearing member 13 using the washer 42. ing. Therefore, it is possible to securely and easily fix the bearing member 13 by using the screws 43. A coil spring or the like may be used as the shaft member 12.

As shown in FIG. 2, a motor 51 for driving an optical pickup is attached to the chassis 25. The motor 51 for driving the pickup is
The pinion 53 is rotated via the gear train 52. The pinion 53 meshes with a rack 54 provided on one side of the slide base 13.
Further, the optical pinion 11 is provided with a skew sensor 55. Reference numeral 56 is an objective lens of the optical pickup 11.

The disk drive device 1 of the embodiment is
When the skew sensor 55 detects the tilt of the optical disc 4 with the above-described configuration, the shaft rotation drive mechanism 21 operates according to the detection output, the main guide shaft 16 is rotated, and the eccentric cam part is rotated. By 31 and the cam follower 41, the optical pickup 11 is rotated around the shaft member 12 to adjust the skew angle.

In the embodiment shown in the drawings,
By fixing the shaft member 12 to the bearing member 13 with the optical pickup 11 tilted, the cam follower 41 is brought into contact with the eccentric cam portion 31 by utilizing the spring force of the shaft member itself. The shaft member 12 is twisted by the spring force of a spring member (not shown) interposed between the optical pickup 11 and the slide base 16,
The cam follower 41 may be in contact with the eccentric cam portion 31.

In the embodiment shown in the drawings,
Although the case where the eccentric cam portion 31 is formed by cutting the main guide shaft 16 in a D-cut shape is shown, the eccentric cam portion 31 may be attached to the main guide shaft 16. Further, in the embodiment, the main guide shaft 16 is rotated to adjust the skew angle, but the sub guide shaft 17 may be rotated to adjust the skew angle. Further, the disc drive device is not limited to the optical disc drive device, but may be a magneto-optical disc drive device.

[0023]

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

(1) In the disk drive device of the first aspect, since the guide shaft is rotated by the shaft rotation drive mechanism to adjust the skew angle of the optical pickup, the skew angle is adjusted in the optical pickup itself as in the conventional case. There is no need to provide a DC motor or a gear train for the optical pickup, and the optical pickup can be made smaller and lighter to enable high speed access. In particular, since the shaft member is fixed to the bearing member, resonance caused by looseness between the shaft member and the bearing member can be prevented, and high-speed access can be made more reliable.

(2) In the disk drive device of the second aspect, the cam follower is brought into contact with the eccentric cam portion by the spring force of the shaft member itself, so that the spring member for bringing the cam follower into contact with the eccentric cam portion is unnecessary. Therefore, the number of parts can be reduced accordingly.

[Brief description of drawings]

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

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

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

FIG. 4 is a side view of the shaft member fixed to the bearing member.

FIG. 5 is a sectional view of an eccentric cam portion.

FIG. 6 is a front view of an eccentric cam portion.

FIG. 7 is a perspective view of a modified example of the shaft member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc drive device 4 ... Optical disc 11 ... Optical pickup 12 ... Shaft member 13 ... Bearing member 14 ... Slide base 16 ... Main guide shuff 17 ... Sub guide shaft 18 ... Turntable 31 ... Eccentric cam part

Claims (2)

[Claims] 1. An optical pickup is swingably attached to a slide base by a shaft member and a bearing member, and the slide base is slide-guided by a pair of guide shafts, and a cam follower is provided in the optical pickup. , The cam follower is brought into contact with the eccentric cam portion of the guide shaft to rotate the guide shaft, so that the optical pickup swings in the skew angle adjusting direction about the shaft member via the eccentric cam portion and the cam follower. In the disk drive device adapted to move, the shaft member is formed so as to be torsionally rotatable by a spring member, one end of which is fixed to the optical pickup and the other end of which is fixed to a bearing member. A disk drive device characterized in that 2. The disk drive device according to claim 1, wherein the cam follower is in contact with the cam portion by a spring force of the shaft member itself.