JPH03120633A - Optical disk - Google Patents

Abstract

PURPOSE:To check the defect of an optical disk and to attain recording/ reproduction at high speed by sticking two single plates where spindle grooves which face opposite directions in such a way that surfaces where the spindle grooves are generated come to the outside so as to form the disk. CONSTITUTION:The optical disk 10 has structure where two 1a and 1b are sticked and spiral grooves generated in the opposite directions are provided for respective single plates 1a and 1b. Consequently, the rotational travel direc tion of the spiral grooves come to the same direction when the optical disk 10 is set to an optical disk device as illustrated. Then, two heads 21a and 21b are provided for the optical disk driving device by facing both sides of the optical disk 10, and respective heads 21a and 21b are driven indenpendently on in terms of interlock. Thus, the defect of the optical disk is checked at high speed and the optical disk is eliminated from turning over and recording ad reproduction can be executed at high speed at the time of reading and writ ing data.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to optical discs, and in particular, to speedy defect inspection of optical discs and a method for quickly inspecting optical discs for defects. The present invention relates to an optical disc suitable for easily sending cents.

[Conventional technology]

A conventional optical disc has a structure in which two veneers with spiral grooves are laminated together.

Here, the two veneers are the same, and the spiral grooves cut into each veneer are formed in the same direction.

[Problem to be solved by the invention]

In the above-described conventional optical disc, when inspecting the optical disc for defects, there is a problem in that the measurement can only be performed on one side at a time, and the speed cannot be increased. In other words, if you try to do this on both sides, since the spiral grooves are carved in the same direction, the head movement direction will be opposite on each side of the optical disk, and a completely different head movement control system will be used. It was necessary to prepare two series.

Furthermore, in the conventional technology described above, when writing or reading data by inserting an optical disk into an optical disk drive device, the optical disk must be turned over in order to write or read data recorded on the opposite side. There was a need. In order to read/write data recorded on the opposite side without turning the optical disk over, two heads may be provided to face each other on both sides of the optical disk.

However, in this case, the moving direction of each head is opposite on each surface of the optical disk, and it is necessary to prepare two completely different head movement control systems.

Furthermore, when using the above-mentioned conventional optical disc in an optical disc library device, the optical disc library device requires a mechanism to select and reverse the optical disc surface, making it difficult to speed up access time. There was a problem.

The present invention has been made in view of the problems of the prior art described above, and has an object to speed up defect inspection of optical discs, eliminate the need to turn over the optical disc when reading/writing data, and perform recording/reproduction at high speed. The objective is to provide an optical disc that allows for

[Means to solve the problem]

The optical disc of the present invention is formed by laminating two veneers with spindle-shaped grooves facing in opposite directions so that the surfaces on which the spindle-shaped grooves are carved are exposed on the surface. It is characterized by

[Effect]

According to the present invention, when an optical disc is set in an optical disc drive and rotated, the spiral grooves travel in the same direction on both sides. Therefore, without providing two different head movement control systems, it is possible to inspect the optical disk for defects and to simultaneously perform data writing/reading on both sides, thereby achieving higher speeds.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in the accompanying drawings.

FIGS. 1(a), 1(a), 1(c), and 1(c) are diagrams showing an embodiment of the optical disc of the present invention. As shown in the figure, the optical disc 10 has a structure in which two veneers 1a and lb are pasted together, and each of the veneers 1a and lb is provided with spiral grooves cut in opposite directions.

Therefore, in the optical disk drive shown in FIG.
When the optical disc 10 shown in Figures (al, (b), and (C)) is set as shown and the spindle 20 is rotated, the directions of rotation of the spiral grooves are the same. As shown, the optical disk drive device has two heads 21a and 2 facing each other on both sides of the optical disk 10.
1b is provided, and each head 21a, 21b is driven independently or in conjunction.

As a result, both sides of the optical disc 10 can be inspected for defects at the same time, and reading/writing can be performed.

As is clear from the above description, according to the present invention, it is possible to simultaneously inspect both sides of an optical disk for defects.
In this case, there is no need to provide two different head control systems.

Furthermore, when writing or reading data with an optical disc set in the optical disc drive, there is no need to turn the optical disc over when writing or reading data recorded on the opposite side. In this case, there is no need to provide two different head control systems.

Further, when the present invention is applied to an optical disk library device, a mechanism for selecting an optical disk surface and reversing the optical disk becomes unnecessary, and it becomes possible to speed up the access time.

(Effects of the Invention) According to the present invention, an optical disc is provided that speeds up defect inspection of an optical disc, eliminates the need to turn the optical disc over when reading/writing data, and allows high-speed recording/reproduction. It becomes possible to do so.

[Brief explanation of drawings]

FIG. 1(a) is a plan view of an optical disc showing an embodiment of the present invention, FIG. FIG. 2 is a bottom view of an optical disc showing one embodiment, and is an explanatory diagram showing an example of an optical disc drive device. la, lb...Single board, 10...Optical disc-20.
...Spindle, 21a, 21b.''Head.

Claims (1)

[Claims] 1. It is characterized by being formed by laminating two veneers with spindle-shaped grooves carved in opposite directions so that the sides on which the spindle-shaped grooves are carved are exposed on the surface. optical disk.