JPH01178145A - Optical recording medium - Google Patents

Abstract

PURPOSE:To enable stable recording and reproducing operations by separating track guide grooves spirally formed on an optical disk substrate from each other and forming said grooves of the respectively plural continuous grooves. CONSTITUTION:This recording medium has the constitution consisting in separating the spirally formed track guide grooves 11A-11C for recording the prescribed information and forming such grooves of the respectively plural continuous grooves on the optical disk substrate 1. The use of optical beams 2A-2C corresponding to the number thereof is, therefore, possible, and the respective track guide grooves 11A-11C are continuous without interruptions from the inside to the outside circumference of the disk 1. The need for track jumping is eliminated even in the case of executing recording and reproducing continuously by using the plural light beams 2A-2C. The stable recording and reproducing operations are thereby obtd. without decreasing the recording capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical recording medium, and more particularly to an optical recording medium of an optical information recording/reproducing apparatus that records or reproduces information by converging a light beam on a track guide groove. It is something.

[Conventional technology]

In recent years, technology has advanced to optically reproduce information such as images and audio recorded as a concentric or spiral series of minute bits on a disk-shaped storage medium, and it is now put into practical use as video disks, digital audio disks, etc. has been made into In addition, optical disk memories are being developed that can be used not only for playback but also for recording and as memory.

Optical disk memory devices capable of such recording and playback are
Compared to conventional magnetic disk memory devices, it has features such as being smaller, lighter, higher recording density, and more reliable in terms of signal quality stability, and is useful not only as an information source for videos and music at home, but also as a file device and file on terminals. It is expected to be applied to memory.

However, on the other hand, it is not possible to increase the rotational speed of disks, etc. due to constraints such as the recording sensitivity of the optical recording medium, the optical output of the semiconductor laser (LD) that is the light source, and the stability of the servo system.
It has the disadvantage that data recording and reproducing speeds are slow compared to magnetic disk memory devices.

As a method to overcome this drawback, there is a method of recording and reproducing using a plurality of light beams.

FIGS. 2(a) and 2(b) are a plan view and a partial perspective view, respectively, for explaining a conventional optical recording medium and a method of recording and reproducing by irradiating the optical recording medium with three light beams. .

A continuous track guide groove 11 is spirally formed on the optical disc substrate IA, and three light beams 2D to 2F are simultaneously irradiated to three adjacent track guide grooves 11 to form recording bits 12. The information is written using the recording bit 12, and the information is reproduced using the recording bit 12. In this way, the recording and reproducing speed can be increased three times.

[Problem that the invention seeks to solve]

The conventional optical recording medium described above has one track guide groove 11.
Since the book has a continuous spiral shape, if you try to increase the recording and playback speed by performing continuous recording and playback with three light beams 2D to 2F, each light beam 2D to 2F will have at least Since it is necessary to jump over two track guide grooves 11, there is a problem that the operation of the track servo system becomes unstable.

Furthermore, during this track jump operation, the recording and reproducing operations are interrupted, so there is a problem that the effective recording area is reduced and the recording capacity is lowered.

An object of the present invention is to solve the above-mentioned problems, and to provide an optical recording medium that does not reduce the recording capacity even when recording and reproducing speeds are increased using multiple light beams and is capable of stable recording and reproducing operations. It is about providing.

[Means for solving problems]

The optical recording medium of the present invention includes an optical disc substrate and a track guide groove formed spirally on the optical disc substrate to record predetermined information, and the track guide groove is irradiated with a focused light beam to record the track guide groove. An optical recording medium for recording and reproducing information has a structure in which the track guide grooves are separated from each other and formed in a plurality of continuous grooves.

[For production]

In the present invention, since the track guide grooves are formed in a continuous multiple spiral shape, it is possible to use light beams corresponding to the number of the track guide grooves, and each track guide groove is formed inside the disk. Continuous from circumference to outer circumference, there is no need for track jumps even when recording and reproducing continuously using multiple optical beams, and the stability is equivalent to recording and reproducing using a single optical beam. Provides excellent servo system operation and storage capacity.

〔Example〕

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

FIG. 1 is a plan view showing one embodiment of the present invention.

On the optical disc substrate 1, there are track guide grooves 11A to ll.
c is continuously formed in a spiral shape from the inner circumference to the outer circumference of the optical disk substrate 1 while maintaining a mutual spacing of 1.6 μm. The three light beams 2A to 2c are irradiated to the corresponding track guide grooves 11A to 11c, respectively, and recording and reproduction can be performed simultaneously with the three light beams 2A to 2c.
A to 2c can move on the continuous track guide grooves 11A to 11c from the inner circumference to the outer circumference in exactly the same way as normal one-beam recording and reproduction.

Therefore, data recording and reproducing speeds three times higher than normal data recording and reproducing speeds can be obtained, and no inconveniences arise due to the three times the normal data recording and reproducing speed.

In this embodiment, a case where there are three track guide grooves and three light beams is illustrated, but the present invention can be similarly applied even if there are two or more than four track guide grooves and light beams.

〔Effect of the invention〕

As explained above, in the present invention, since the track guide grooves are formed of a plurality of continuous track guide grooves that are separated from each other,
Even when recording and reproducing speeds are increased using a plurality of light beams, stable recording and reproducing operations can be achieved without reducing the recording capacity.

[Brief Description of the Drawings] Figure 1 is a plan view showing an embodiment of the present invention, Figure 2 (a)
, (b) are a plan view showing an example of a conventional optical recording medium and a partial perspective view for explaining a recording and reproducing method using a plurality of light beams, respectively. 1, IA... Optical disk substrate, 2A-2F... Light beam, 11.11A-llc... Track guide groove, 1
2... Recording bit.

Claims (1)

[Claims] An optical recording medium comprising an optical disk substrate and a track guide groove formed spirally on the optical disk substrate to record predetermined information, and recording and reproducing the information by irradiating the track guide groove with a focused light beam. 2. The optical recording medium according to claim 1, wherein the track guide grooves are separated from each other and formed in a plurality of consecutive grooves.