JPH01184673A - Optical head guiding mechanism - Google Patents

Abstract

PURPOSE:To prevent performance degradation due to abrasion by constituting a guiding mechanism of a diaphragm. CONSTITUTION:Diaphragms 1 and 2 are fitted to a supporting table 3 at a fixed space, the inter-rerative central parts of the diaphragms 1 and 2 are connected by a supporting guiding shaft 4 of an optical head 6. By connecting it with a VCM (voice coil motor) 5. The head 6 fitted to the tip top of the shaft 4 moves like an array A. For a constitution like this, stable linear motion can be executed by the generation of the self reaction force of the diaphragms 1 and 2 even when external force to generate on the linear motion is received. Thus, performance degradation due to the abrasion of parts is eliminated since a sliding part does not exist.

Description

[Detailed description of the invention] (1) Technical field to which the invention belongs The present invention relates to a linear guide mechanism for an optical head.

(2) Prior art and its problems Conventional linear guide mechanisms for optical heads are generally of the type in which ball bearings move or slide bearings slide on guide rails.

However, for practical use of this mechanism, extremely high component precision and assembly precision are required, and sometimes the surface roughness of the shaft may be affected.

Circularity, straightness, and cylindricity may require submicron precision.

Furthermore, the shape and material of the guide rail, as well as the method of mounting the guide rail, are extremely important, and these factors often directly affect the performance of the optical head.

FIG. 1 shows an example of a conventional linear guide mechanism for an optical head using a rolling bearing and a slide shaft. Hikari Herad 6
When moving, it is necessary that the distance between the optical radar 6 and the disk 7 is constant, and furthermore, the direction must be the same as that of the disk 7.
must go to the center of All of this accuracy depends on the rolling bearing 8 and the slide shaft 9, and it is necessary that the slide shaft 9 has high accuracy in surface roughness, roundness, straightness, cylindricity, etc., and high assembly accuracy.

A certain preload must be applied to the rolling bearing, and for this purpose the mutual spacing of the slide shafts 9 must also be constant and they must be parallel to each other. In this way, it is necessary to improve component precision and assembly precision for optical head movement. Furthermore, in a linear guide mechanism using a slide bearing, it is necessary to set the gap between the slide shaft 9 and the slide bearing to an optimum value.

As described above, conventional linear guide mechanisms have point contact portions or line contact portions, and there is also the problem of wear of each component. A possible solution to this problem of wear is to configure non-contact bearings using air or oil as a medium, but this requires an air source or hydraulic pump and a piping system for them, which has the disadvantage of increasing the size of the equipment. There is.

In any case, the linear guide mechanism for the optical head includes a linearly moving body and its guide, and has the drawback that in order to improve the guide accuracy, the precision of each component and the assembly precision must be improved.

(3) Purpose of the Invention The purpose of the present invention is to not only solve the problem of deterioration of performance due to wear because it does not use sliding parts, which is a problem with conventional optical head linear guide mechanisms, but also to achieve high precision. It is an object of the present invention to provide an optical head guide mechanism that does not require any parts and can be configured with an extremely small number of parts.

(4) Structure of the Invention (4-1) Features of the Invention and Differences from the Prior Art The optical head guide mechanism according to the present invention has a diaphragm that provides all It is characterized by having a motor suppressing function. As shown in Figure 3.4, the reaction force of PI' acts against the acting force of Fl, and in the same way, the force of F2° acts on F2 and the force of F3° acts on F3, which has a deterrent effect against the action that inhibits linear motion. Therefore, it becomes a linear guide mechanism. On the other hand, in conventional linear motion, there is a bearing part, and each component precision of this bearing part is required to be assembling precision 2. This bearing part regulates the movement of the linearly moving body. In the present invention, the bearing section is considered to be replaced with a diaphragm, and the linear motion mechanism can be easily constructed with high rigidity.

(4-2) Embodiment [Embodiment 1] FIG. 2 is a front view of an optical head drive unit in an optical disk device according to an embodiment of the present invention.

The diaphragms 1 and 2 are attached to a support base 3 at regular intervals, and the diaphragm 1
．． The two centers are connected to each other.

The above are the main components of the linear motion mechanism. In this embodiment, for example, a VCM (
By connecting to the voice coil motor) 5, the optical head 6 attached to the tip of the support guide shaft 4 moves in the direction of arrow A.
Move left and right as indicated by .

・ Due to this structure, external forces generated during linear motion (Fl, F2, F3 shown in Figure 3.4)
), it is possible to perform stable linear motion due to the generation of reaction forces of the diaphragms 1 and 2.

The rigidity and stroke size of the linear guide mechanism according to the present invention can be arbitrarily set by changing the shape and thickness of the diaphragm 1.2.

[Example 2] FIG. 5 shows another embodiment of the invention.

It is also possible to reduce the size by changing the shape like the diaphragm IO. Other parts such as the drive unit are the same as those in the first embodiment, so illustration and description will be omitted.

(5) As described in detail, according to the present invention, by configuring the guide mechanism using a diaphragm, the number of parts is reduced and assembly is easy, and since there are no sliding parts, parts wear out. There is no need to take into account performance deterioration caused by this mechanism, and it is extremely advantageous from a management perspective compared to conventional mechanisms.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a conventional linear guide mechanism using rolling bearings and guide rails, Fig. 2 is a front view including a cross section showing an embodiment of the guide mechanism according to the present invention, and Fig. 3 is a front view showing an example of a conventional linear guide mechanism using a rolling bearing and a guide rail. FIG. 4 is a cross-sectional view showing the shape of the diaphragm, FIG. 4 is a front view showing the shape of the diaphragm used in the present invention, and FIG. 5 is a cross-sectional view showing another embodiment of the guide mechanism according to the present invention. 1.2...Diaphragm, 3...Support stand, 4...
Support guide shaft, 5...VCM, 6...Optical head, 7
...Disk, 8...Rolling bearing, 9...Slide shaft, 10...Diaphragm, Fl...Left-right motion force, Fl'...Reaction force against Pi, F2...
・Vertical motion force, F2' ... Reaction force against F2, F3
... Rotational force, F3' ... Reaction force against F3. Patent applicant Asaka Co., Ltd.

Claims (1)

[Claims] Diaphragms in the form of thin plates having concentric circles or symmetrical unevenness in the vertical and horizontal directions are arranged at regular intervals, and the centers of the plurality of diaphragms are connected to each other by a support guide shaft of the optical head. A guide mechanism for an optical head having a configuration.