JPH02249152A - disc-shaped optical recording medium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disk-shaped optical recording medium (hereinafter referred to as an original disk) on which signals are recorded, reproduced, or erased using optical means.

2. Description of the Related Art In recent years, optical disks have been utilized as large-capacity memories. The optical discs have evolved from read-only discs that can only be read back, to write-once discs that can record and play back, to rewritable discs that can record, play back, and erase, and hybrid optical discs are also on the verge of being put into practical use.

An example of a conventional optical disc will be described below with reference to the drawings.

FIG. 3 shows the structure of a conventional optical disc.

In FIG. 3, 10 and 11 are transparent substrates, 12 is an adhesive layer, and 13 and 14 are tracking guide grooves.

FIG. 2 is an explanatory diagram of the operation of an optical recording and reproducing apparatus, which is of a type that continuously reproduces side A (front side) and side B (back side) of a double-sided optical disc. In FIG. 2, 6 is a disk motor, 7 is an optical disk, 8 is an optical pickup, and 9 is a guide rail.

Problems to be Solved by the Invention However, with the above configuration, in an optical recording and reproducing apparatus as shown in FIG. case,
It had the following problems.

First, the operation of the optical recording/reproducing apparatus will be explained using FIG. When the original pickup 8 finishes scanning the A side of the original disk 7 from the inner circumference to the outer circumference, it instantly moves to the B side along the guide rail 9 and starts scanning from the inner circumference of the B side. However, as shown in FIG.
or counterclockwise) spiral tracking guide groove 1
It had 3.14. To this end, when recording, reproducing, or erasing the A and B sides of the optical disc 7 in succession in an optical recording/reproducing apparatus as shown in FIG. 2, the rotational direction of the disc motor must be reversed. It was necessary to be able to scan the optical pickup correctly from the inner circumference to the outer circumference.

In this way, when switching from the A side (B side) to the B side (A side), a waiting time of about 10 seconds is required for the disk motor to start rotating, and the system operation is slow. It had the problem of being slow.

The object of the present invention is to provide an original disk that can be continuously recorded, played back, and erased on both sides without reversing the rotational direction.

Means for Solving the Problems In order to solve the above-mentioned problems, the optical disc of the present invention has one transparent substrate having a spiral tracking guide groove extending clockwise from the inner circumference to the outer circumference. The other transparent substrate, which is bonded to the transparent substrate through an adhesive layer formed on the opposing transparent substrate, has a spiral tracking guide groove running counterclockwise from the inner circumference to the outer circumference.

Effect of the Invention With the above-described configuration, the present invention enables continuous recording, reproduction, or erasing from one side of the disk to the other side of the double-sided optical disk without reversing the rotational direction of the disk motor. .

Embodiment Hereinafter, an optical disc according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the structure of a double-sided optical disc in an embodiment of the present invention.

In FIG. 1, 1 and 2 are transparent substrates, 3 is an adhesive layer, and 4 is a transparent substrate.
and 5 are tracking guide grooves.

First, as shown in FIG. 1, the tracking guide groove 4 is a clockwise spiral groove going from the inner circumference to the outer circumference, and the tracking guide groove 5 is a counterclockwise spiral groove going from the inner circumference to the outer circumference. be.

In FIG. 2, for example, if the disk motor 6 rotates inward in a counter-chronological direction when viewed from the initial position a of the optical pickup 8, then
The tracking guide groove 4, which is rotated clockwise on the surface, can correctly scan from the inner circumference to the outer circumference.

Next, when the optical pickup 8 moves to the 8-side playback position, unless the direction of rotation of the disc motor 6 is changed, the original disc 7 will rotate clockwise relative to the original pickup 8. .

However, by providing a tracking guide groove 5 with a counterclockwise opening on the B surface, the optical pickup 8 can be correctly scanned from the inner circumference to the outer circumference.

As described above, according to the present invention, in a double-sided optical disc, sides A and B of the disc can be continuously reproduced, recorded, or erased without reversing the rotational direction of the disc motor. Effects As described above, according to the present invention, in a double-sided optical disc, it is possible to continuously reproduce, record, or erase on both sides of the disc without reversing the rotational direction of the disc motor. This greatly reduces the time it takes to switch to the other mode. .

[Brief explanation of drawings]

FIG. 1 is a structural diagram of a disk-shaped recording medium in an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of an optical recording/reproducing device, and FIG.
The figure is a J:jllj construction diagram of a conventional disk-shaped recording medium. 1, 2, 10, 11...transparent substrate, 3, 12...
...Adhesive layer, 4, 6, 13, 14...Tracking guide groove, 6...Disc motor, 7...
...Optical disc, 8 ...Original pickup, 9...
・Guide rail. /, 2- Hu Kihan 3- Chiang Jian 4

Claims (1)

[Claims] In a disc-shaped optical recording medium in which signals are recorded, reproduced, or erased from both sides using optical means, one transparent substrate has a spiral tracking guide groove running clockwise from the inner circumference to the outer circumference, and the The other transparent substrate, which faces the transparent substrate and is bonded to the transparent substrate via an adhesive layer formed on the transparent substrate, has a spiral tracking guide groove running counterclockwise from the inner circumference to the outer circumference. A disc-shaped optical recording medium characterized by: