JPH04139652A - Optical disk device - Google Patents

Abstract

PURPOSE:To smoothly perform the read-out, etc., of an optical disk and to promote the durability by forming a bore surface of a hub into a round shape and with precision finishing and giving specular finishing, etc., to an outer surface of a spindle shaft. CONSTITUTION:Bore end surface of the hub 7 for positioning an optical disk for its centering are formed with precision finishing to have rounds 7a, and the outer surface of the spindle shaft is given specular finishing, and when the hub 7 and the spindle shaft are conformed to each other in hardness, deformation of a fitting part of the optical disk with the spindle due to a gnawing phenomenon or abrasion caused by repetition of mounting and dismounting operations of the optical disk on and from the spindle can extermely be reduced by simple constitution, and the amt. of eccentricity and inclination become the min., and the read-out is smoothly carried out while the durability is promoted, and hence the optical disk device of extremely high reliability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc device, and more particularly to an optical disc device in which a hub and a spindle of a positioning and centering portion of an optical disc are improved.

[Conventional technology]

Conventionally, this type of optical disc device has a steel hub having a round hole opening with a chamfered end face for centering and positioning in the center of the optical disc, and the outer part of a steel spindle shaft that has been ground or turned. The optical disc is mounted on the spindle by fitting the diameter portion and the hub, and the optical disc is attracted and fixed by a magnet provided on the spindle hub of the spindle.

[Problem to be solved by the invention]

In the above-mentioned conventional optical disc device, the inner diameter end face of the hub for centering and positioning the optical disc is chamfered, the outer diameter finish of the spindle shaft has a surface roughness comparable to that of grinding or turning, and the hub and spindle are There is a big difference in hardness from the shaft. For this reason, when the photon disk is installed on the spindle, the impact and friction of the mating part may cause a so-called swishing phenomenon, or if the photon disk is installed multiple times or
If the detachment operation is repeated, either the hub of the optical disk or the spindle shaft may become deformed due to wear, and the eccentricity of the optical disk mounted on the spindle may increase or the optical disk may become tilted with respect to the spindle hub. This has caused problems such as the disc being attached to the optical disc, causing problems in reading data from the optical disc, etc.

[Object of the Invention] The present invention aims to improve the inconveniences of the conventional example, and in particular to provide an optical disc device that can perform smooth reading of optical discs and has increased durability.
That purpose.

(Means for Solving the Problems) The present invention includes an optical disc, a spindle rotation mechanism that positions and supports the optical disc and rotates it, an optical head for recording and reproducing information, and a positioning system that holds and fixes yF to the optical disc. In an optical disc device comprising a carriage that performs
The outer diameter surface of the spindle shaft of the spindle rotation mechanism has a mirror finish. This aims to achieve the above-mentioned purpose.

C Example] Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially sectional front view of an optical disk device according to an embodiment of the present invention, and FIG. 2 is a detailed view of the vicinity of the hub of the optical disk of the device.

1 and 2, the optical disc device of this embodiment includes a head plate 1 mounted on a frame I3 via a vibration isolating rubber 9, and an optical disc 6 fixed to the head plate 1 and housed in a cartridge 5 that supports and rotates. The optical head 11 is composed of a spindle 2 for holding and fixing the optical head 11 and a carriage 10 for positioning the optical head 11.

The spindle 2 is composed of a spindle hub 3, a spindle shaft 8, and a motor 14. The spindle hub 3 is provided with a magnet 4 on the opposite surface of the hub 7 of the optical disk 6, and has a hub 7 having a round 7a shape and precision finished.
The optical disc 6 is positioned and centered in the radial direction by fitting the inner diameter of the mirror-finished outer diameter of the spindle shaft 8, and the flange surface 3a of the spindle hub 3 positions the optical disc 6 in the axial direction. The optical disk 6 is mounted on the spindle 2 by the adsorption force of 4.

The carriage 10 is equipped with an optical head 11 and an optical disk 6
In order to drive the linear reciprocating motion of the carriage 10, a magnetic circuit 12 constituted by a permanent magnet is provided, and a coil connected to the carriage 10 (Fig. (not shown) and the magnetic circuit 12 cause the carriage 10 to reciprocate.

The optical disk publication configured as described above operates as follows. First, when the optical disk 6 driven by the motor 14 is rotating together with the spindle 2, when a positioning command is received from a host device of the optical disk device, the carriage 10 is instructed by a positioning control circuit (not shown). A seek operation is performed, and the optical head 11 records and reproduces information on the optical disc 6 at the designated predetermined position.

〔Effect of the invention〕

As explained above, in the optical disc device of the present invention, the inner diameter end face of the hub for centering and positioning the optical disc has a round shape with precision finishing, the outer diameter face of the spindle shaft has a mirror finish, and the hub of the optical disc and the spindle shaft are With the simple configuration of matching the hardness of
It is possible to minimize the deformation caused by caulking or abrasion of the fitting part due to repeated attachment and detachment of the optical disk to the spindle,
The amount of eccentricity and inclination are minimized, and an optical disk device with extremely high reliability can be provided.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of an optical disk device showing an embodiment of the present invention, and FIG. 2 is a detailed view of the vicinity of the hub of the optical disk of the above embodiment. 2...Spindle, 6...Optical disc, 7...Hub, 7a...Round, 8
...Spindle shaft, 11...Light hend.

Claims (3)

[Claims] (1) An optical disc, a spindle rotation mechanism that rotationally drives the optical disc via a positioning and centering unit, an optical head disposed opposite to the disc surface of the optical disc, and an optical head that holds and supports the optical head. and a carriage for positioning, and the positioning centering part is an optical disc device in which a hub provided in advance is fitted to a spindle shaft of the spindle rotation mechanism, wherein the outer surface of the spindle shaft is mirror-finished. An optical disc device characterized by: (2) The optical disc device according to claim 1, wherein the inner diameter surface of the hub that is fitted to the spindle shaft is rounded, and the inner diameter surface is precisely finished. (3) The optical disc device according to claim 1, wherein the hardness of the spindle shaft and the hardness of the hub are set to be the same hardness.