JPH07225970A - Optical disk system - Google Patents

Abstract

PURPOSE:To enable recording and reproducing on both A-side and B-side without turning over a disk surface of a sticking type optical disk. CONSTITUTION:In the optical disk system consisting of the sticking type optical disk 100 and a recording and reproducing device for recording and reproducing the sticking type optical disk 100, the sticking type optical disk 100 is formed in such a manner that two optical disks whose groove centers provided in their disk surfaces are coincident with the center of a hub 700 to be provided in their inner holes respectively are stuck up, and also the centers of the grooves provided in the two optical disks are coincident with each other. The recording and reproducing device is equipped with two recording and reproducing mechanisms 500 and 600 corresponding to both sides of the sticking type disk 100. By this method, since the A side and the B side are both recorded and reproduced without turning over the disk, the handling is convenient.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk system comprising a bonded type optical disk in which the centers of grooves provided in two optical disks coincide with each other and a recording / reproducing apparatus for recording / reproducing the bonded type optical disk. .

[0002]

2. Description of the Related Art A conventional recording / reproducing apparatus, which is an apparatus for recording / reproducing information on / from an optical disk, is currently equipped with only one recording / reproducing mechanism. Therefore, in order to record or reproduce one surface of the bonded optical disk, for example, the A surface, subsequently to another surface, for example, the B surface, the hub provided on the A surface is removed from the spindle of the recording / reproducing apparatus. After the removal, the bonded optical disk is turned over again, and the hub provided on the B side is attached to the spindle of the recording / reproducing apparatus.

At this time, the center of the hub on the A-side or B-side and the center of the spindle of the recording / reproducing apparatus coincide with each other, and the recording / reproducing mechanism can follow the groove of the optical disk.

[0004]

In recent years, the optical discs of the above-mentioned optical disc have been flipped over without using a recording / reproducing apparatus having two recording / reproducing mechanisms corresponding to both sides A and B of a bonded optical disc. Development of an optical disc system capable of recording or reproducing information from the A side and B side is expected.

In the above system, first, the hub on the side A is attached to the spindle so that the center of the spindle is aligned with the center of the groove. The recording / reproducing mechanism provided on the A side moves along the groove to reproduce information from a desired portion recorded on the A side.

Further, the side to be reproduced is switched from the side A to the side B. At this time, the recording / reproducing mechanism provided on the B side moves along the groove without reversing the surface and reproduces information from a desired portion recorded on the B side.

By the way, since the conventional bonded optical disk is not supposed to be used in the above-mentioned recording / reproducing apparatus, the center of the groove on the A side and the center of the groove on the B side do not coincide. There is.

Therefore, when the above-mentioned conventional bonded optical disk is loaded into a recording / reproducing apparatus having two recording / reproducing mechanisms corresponding to both sides A and B, either side A or side B is loaded. When the hub is fixed to the spindle of the recording / reproducing apparatus having the two recording / reproducing mechanisms, the center of the hub on the other surface does not coincide with the center of the spindle.

For this reason, on the other surface, the center of the spindle does not coincide with the center of the groove on the surface, so that the recording / reproducing mechanism cannot follow the groove.

An object of the present invention is to provide an optical disk system capable of recording and reproducing on both the A side and the B side without turning over the surface of the bonded optical disk.

[0011]

The gist of the present invention is an optical disk system comprising a bonded optical disk and a recording / reproducing apparatus for recording / reproducing the bonded optical disk, wherein the bonded optical disk is provided on the disk surface. The center of the groove and the center of the hub provided in the inner hole are aligned with each other, and the two optical discs are bonded together, and the centers of the grooves provided on the two optical discs are aligned with each other. The apparatus is an optical disk system characterized by including two recording / reproducing mechanisms corresponding to both surfaces of the bonded disk.

[0012]

In the optical disk system of the present invention, since the center of the groove on the A-side and the center of the groove on the B-side of the bonded optical disk to be used coincide with each other, from the A-side to the B-side or from the B-side to the A-side, Even if the recording or reproducing surface is changed, the recording and reproducing device having the recording and reproducing mechanism on both the A side and the B side can follow the groove of the optical disc.

[0013]

EXAMPLES Examples will be described below, but the present invention is not limited thereto. FIG. 1 is a schematic view showing a main part of a bonding apparatus used when manufacturing a bonded optical disc used in the present invention. FIG. 2 is a schematic diagram showing a recording / reproducing apparatus used in the optical disc system of the present invention.

A polycarbonate (hereinafter abbreviated as PC) resin is poured into an injection molding machine equipped with a stamper having a spiral groove having a width of 0.6 μm, a depth of 0.7 nm, and a pitch of 1.6 μm. A PC board having a groove was formed.

After depositing a first dielectric layer on the PC substrate by sputtering with SiO ₂ as a target, Tb
A recording layer was laminated by a sputtering method using FeCo as a target. Further, a second dielectric layer was laminated on the recording layer on the PC substrate by sputtering with SiO ₂ as a target, and then an ultraviolet curable resin was applied by spin coating as a protective layer to manufacture a single-sided optical disk.

A PC having a groove as described below
The hub was fitted into the inner hole of the board. The single-sided optical disk is placed on a rotary table having an alignment mechanism with respect to both axes of the orthogonal two-axis coordinate system, and the hub is placed in the inner hole of the optical disk. The center of the hub and the center of the groove were measured, and the hub and the optical disc were moved according to the amount of deviation between them, and then the hub was fitted into the optical disc.

After applying the adhesive to the protective layer of the obtained single-sided optical disk with hub, two single-sided optical disks 10 and 20 are mounted on the laminating apparatus shown in FIG. 1 so that the adhesive surfaces face each other. To do.

The cylinder 30 is inserted into the recess 11 of the hub fitted in the single-sided optical disk 10. Cylinder 3
The tip portion 31 of 0 and the recessed portion 11 of the hub have the same shape.
Similarly, the cylinder 40 is inserted into the single-sided optical disc 20. The cylinders 30 and 40 are vertically moved by a driving device (not shown) to bond the adhesive surface of the single-sided optical disk 10 and the adhesive surface of the single-sided optical disk 20.

The shape of the tip portion 31 of the cylinder 30 shown in FIG. 1 can be appropriately selected according to the shape of the recess of the hub.

In the bonded type optical disc obtained as described above, the center of the groove and the recess of the hub are aligned,
Furthermore, the centers of the grooves of the two optical discs that are stuck together are aligned.

Recording or reproduction is performed on the bonded optical disk obtained as described above by using the recording / reproducing apparatus shown in FIG. The bonded optical disk 100 is mounted on the spindle 700. A recording / reproducing mechanism 500 is provided on the lower surface side of the bonded optical disk, and a recording / reproducing mechanism 600 is provided on the upper surface side of the bonded optical disk.

The recording / reproducing mechanism 500 is composed of an optical unit 50 and a slider unit 51, and the recording / reproducing mechanism 600 is composed of an optical unit 60 and a slider unit 61. The slider unit 51 is provided with an objective lens 52. Although not shown, the slider unit 61 is also provided with an objective lens.

The hub on the A surface is mounted on the spindle 700, and the center of the groove provided on the A surface and the center of the spindle 700 are aligned with each other. The recording / reproducing mechanism 600 for recording or reproducing on the A side operates following the groove. After the desired recording or reproduction is completed, recording or reproduction of the B side is performed.

At this time, since the center of the groove on the A side and the center of the groove on the B side of the bonded type optical disk used in the present invention coincide with each other, the center of the groove provided on the B side at the same time. The center of the spindle 700 is aligned. Therefore, the recording / reproducing mechanism 500 for recording or reproducing on the B side can operate following the groove.

[0025]

As described above, according to the present invention, recording or reproducing can be performed on the A side and the B side of the bonded optical disk without turning over, so that the handling is simple.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a main part of a bonding apparatus used when manufacturing a bonded optical disc used in the present invention.

FIG. 2 is a schematic diagram showing a recording / reproducing apparatus used in the optical disc system of the present invention.

[Explanation of symbols]

 10 Single-sided optical disk 11 Hub 30 Cylinder 100 Bonding type optical disk 500 Recording / reproducing mechanism 600 Recording / reproducing mechanism 700 Hub

Claims (1)

[Claims] 1. An optical disk system comprising a bonded optical disk and a recording / reproducing device for recording / reproducing the bonded optical disk, wherein the bonded optical disk is provided in a center of a groove provided on a disk surface and in an inner hole. The two optical disks that are aligned with the center of the hub are bonded together, and the centers of the grooves provided on the two optical disks are aligned with each other, and the recording / reproducing apparatus has both surfaces of the bonded-type disk. An optical disc system comprising two recording / reproducing mechanisms corresponding to.