JPS59162649A - Optical disc driving mechanism - Google Patents

Abstract

PURPOSE:To improve tracking capacity, disturbance resistivity, workability for assembling, etc. by regulating the moving direction of an optical pickup to the tracking direction by using a pin as a fulcrum by a rocking means in the following-up operation of a driving mechanism. CONSTITUTION:Guide rails 20 and 30 are set in parallel with a tracking direction A, and the first carriage 10 is guided by guide rails 20 and 30 and is freely moved. An optical pickup 40 is constituted as one body together with a movable coil 15 of a linear motor, and a linear motor yoke 16 is set in parallel with guide rails 20 and 30. In case that the first carriage 10 is stopped and held in a desired position, an electromagnet 70 is turned on. Then, a plate 71 is bent by the magnetic attraction and is brought closely into contact with the electromagnet 70. Thus, the carriage 10 is held fixedly to the plate 71 as an immobile member. In case that the following-up operation to match a minute spot from the optical pickup 40 to a track on an optical disc is performed, the movable coil 15 is moved by a minute extent after the first carriage 10 is stopped and held in a desired position by a positioning means.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an optical disk drive mechanism, and more particularly to an optical disk drive mechanism that controls the movement of an optical pickup.

(Prior Art) In optical disk devices, in order to adapt to high-density trunks, the depth of focus of the objective lens of the optical pickup must be made small in order to narrow down the optical spot to a very small size. Tracking and focusing control for eccentricity, surface runout, etc. have become essential technologies. Here, tracking control refers to control in the radial direction of the optical disk, and focusing control 1 refers to control in the direction perpendicular to the surface of the optical disk.

Conventionally, due to the ultra-high accuracy required for tracking control and the desire to downsize the drive source, only the objective lens in the optical pickup was controlled, and large movements in the disk radial direction were controlled separately. The configuration uses a drive source. This conventional method causes problems in tracking control. This is because only the objective lens in the optical pickup amplifier, which constitutes the production (or recording) optical system, is driven, and as a result, the optical axis is easily misaligned, and only a small value is allowed for the amount of track eccentricity of the optical disc. It is not compatible with the above.

In order to solve this problem, a system with a configuration shown in FIG. 1 has been proposed.

In the figure, reference numeral 1 designates a carriage, which is engaged in a guide rail 2.3 set along the dragging direction A. Inside the rod-shaped carriage 1, an optical pickup 4 is held between cylindrical leaf springs 5 and 6. The plate, carriage, and optical pickup are fixed to each other at point P. Further, an electromagnet 7 is integrally formed in a part of the carriage 1, and when the carriage 1 is to be fixed, a plate 8 serving as a stationary part 12 is curved and attracted by magnetic force, and the carriage 1 is stopped and fixed.

The optical pickup 4 is constructed integrally with a moving coil of a linear motor (not shown), so that the optical pickup 4 is moved to a desired position in the tracking direction in accordance with the drive of the linear motor. In addition, the following operation for aligning the minute spot from the optical pink amplifier with the track on the optical surface is performed by first fixing the carriage 1 at a predetermined position by actuating the electromagnet 7, and then driving the linear motor to move the leaf spring 5. , 6 along with the transformations. but,
Even in this proposed technique, since the support means for the optical pickup is fixed at points with the plate springs 5 and 6, it has an unexpected degree of freedom and is unstable in directions other than the trunking direction.

That is, the rigidity in the track direction (also referred to as the time axis direction or jitter direction) indicated by arrow B perpendicular to the tracking direction is insufficient, the disturbance resistance is insufficient, and there are other variations in spring characteristics and dimensions. These tubes have various problems such as poor stability during component manufacturing and poor workability during assembly.

(Objective) Therefore, an object of the present invention is to provide an optical tisf drive mechanism that can improve tracking performance, resistance to external disturbances, workability during assembly, and the like.

(composition) The configuration of the present invention will be explained below based on one embodiment.

In FIGS. 2 and 3, the reference numeral 10 indicates a first carriage, which is formed into a rectangular frame shape, and has two guide lances at the bottom.
Knolls 20.30 are inserted through linear bearings. The guide rails 20.30 are set parallel to the racking direction A, and the first carriage 10 is set parallel to the racking direction A.
It can be moved freely by being guided by 0.30. The base end of the second carriage 11 is pivotally attached to one end of the upper surface of the first carriage 10 in the track direction BJ2 by a pin I2.

An optical pickup 40 is disposed integrally with the second carriage 11 at its free end. Thus, the optical pink amplifier 40 and the second carriage 11 have a degree of freedom in swinging in the tracking direction A about the pin 2. -In addition, the second carriage 1
The free ends of 1 are opposite to each other in the tracking direction,
It is pulled with equal force by tension springs 13, 14 and is stably locked in the central position of the opening formed in the second carriage 11. These second carriages] and pins 12 serve as an example of swinging means, and have the function of supporting the optical pick amplifier 40 swingably in the tracking direction A. Further, the spring 13.1.4 is used as a spring means, and has the function of setting a reference position for swinging of the optical pink amplifier 40.

Next, the optical pickup 40 is constructed integrally with the moving coil of the linear motor 5, and the linear motor yoke 16 is connected to the guide rail 20. It is set parallel to 30. In addition, the code|symbol 17 shows a permanent magnet.

These moving coil 15, linear motor yoke 16, permanent magnet 17, etc. are used as a tracking drive means for the optical pickup, and as the moving coil 15 moves, the optical pickup 40, the first carriage 10, and the second carriage 11 are moved to drive the optical pickup. to the desired position.

Next, reference numeral 70 indicates an electromagnet formed integrally with the first carriage 10, and reference numeral 71 indicates a band-shaped plate stretched between stationary members in close opposition to the electromagnet 70. This is an example of a positioning means for stopping and holding 10 at a desired position and releasing it. For example, in order to stop and hold the first carriage 10 at a desired position, the electromagnet 70 is turned on. Then, the plate 71 bends due to the magnetic attraction force and comes into close contact with the electromagnet 70. Thus the first
The carriage 10 is fixedly held with respect to a plate 71 which is a stationary member.

When performing a follow-up operation to align a minute spot from the optical pickup 40 with a track on the optical disk surface, the moving coil 15 is moved by a minute amount after the carriage "0" is stopped and held at a desired position by the positioning means. Do it by doing this.

Although one embodiment has been described above, the driving means is not limited to a linear linear motor, but may also be an oscillating linear motor. It is also conceivable that the second gear carriage [1] in the above embodiment be omitted by configuring the optical pink-up maggot puffer fish itself to be swingable with respect to the first carriage 10.

(Effects) According to the optical disk drive mechanism according to the present invention, since the moving direction of the optical pickup is restricted by the swinging means to the tracking direction A with the pin 12 as the fulcrum during the tracking operation, it is possible to obtain the effect of excellent resistance to external disturbances. . In addition, the springs used can be assembled by simply hanging both ends, and coil springs can be used that are easy to set up without the need for fixing as in the conventional technology, which improves assembly work efficiency and reduces costs as a result. I can do it.

[Brief explanation of drawings]

FIG. 1 is a plan view of an optical tisf drive mechanism as a conventional technique, FIG. 2 is a plan view of an optical tisf drive mechanism as an embodiment of the present invention, and FIG. 3 is a front view of the same. 1.0 1st gear carriage, 11 2nd gear carriage,
12 pins, 13. 14 spring, 15
Moving coil, 16 Linear motor, 17
Permanent magnet, 40 Optical pink amplifier, 70-electromagnet, 71 Great.

Claims (1)

[Claims] Two driving sources are used to drive both the operation of transporting the optical pickup to a desired position in the radial direction of the optical disk and the following operation of aligning the minute spot from the optical pickup with a track on the surface of the optical disk. In the optical disk drive mechanism of the method using
a carriage, a tracking drive means for the optical pink amplifier, a swinging means for supporting the optical big amplifier so as to be swingable in the radial direction of the optical disk by pivotally connecting one end to the first carriage, and moving the first carriage to the optical disk. positioning means for stopping and holding and releasing at a desired position in the radial direction;
An optical disk drive mechanism comprising spring means for determining the reference position of the rocking of the optical pink amplifier.