JPH04111236A - Optical recording medium - Google Patents

Abstract

PURPOSE:To obtain an optical recording medium having extremely large information recording capacity by forming a land area between adjacent groove concentrically or helically provided in a manner that the land is wider than the groove width and recording information in several channels parallely in the land while recording header information such as track address and sector address in the groove. CONSTITUTION:On the one surface of a disk substrate 1, for example, helical groove 2 is formed in a manner that a land 3 between adjacent grooves 2, 2 where pits P are formed for recording information. The land 3 is twice or more wider than the groove 2 width and has several channels C1, C2, C3,... C8 to record information parallely. The header information such as track address and sector address of the information in the land 3 are preliminarily recorded in the groove 2. Thereby, the information recording density in the circumference direction of the land can be increased with radial density.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical recording medium, and more specifically, it proposes an optical recording medium with an extremely large information storage capacity.

[Conventional technology]

FIG. 2 is an enlarged perspective view showing a portion of a conventional optical recording medium. For example, a spiral groove 2 is formed on one side of the disk-shaped substrate 1. Between the adjacent grooves 2.2 is a land 3 on which information is recorded by forming a pinot l-P. The width of the land 3 is slightly larger than the width of the groove 2, and is less than twice the width of the groove 2. In land 3, information of a single channel is recorded.

When recording information on this optical recording medium using, for example, a 2-7 code, "1" and "1" between "1" and "1" are numbers from 2 to 7.
0”, for example, 1001.1000
1,100001. ... Information is recorded in a pattern of 100000001.

Furthermore, header information such as a track address and a sector address of the information recorded therein is recorded on the land 3 within a predetermined period.

[Problem to be solved by the invention]

As mentioned above, in conventional optical recording media, it is necessary to record header information on the land 3 within a predetermined period, which limits the amount of information to be recorded, and the recording density of information in the circumferential direction of the land 3 is limited. descend.

Furthermore, since there is a groove 2 with a width slightly smaller than the width of the land 3 between adjacent lands 3, the area occupied by the land 3 is reduced, and information is recorded in the radial direction of the land 3. There is a problem with low density.

In view of this problem, the present invention aims to provide an optical recording medium with a large recording capacity of information to be recorded.

[Means to solve the problem]

In the optical recording medium according to the present invention, the width of the land between adjacent concentric or spiral grooves is made larger than the width of the groove, and information of multiple channels is recorded in parallel on the land. However, header information such as the track address and sector address of the recorded information is recorded in the groove.

[Effect]

The width of the land between adjacent concentric or spiral grooves is at least twice the width of the groove.

Information is recorded in the land. Groove Uni records header information such as the track address and sector address of the recorded information+a.

This makes it possible to increase the information recording density in the circumferential direction of the runt,
Furthermore, the information recording density in the radial direction of the land can be increased.

〔Example〕

The present invention will be described in detail below with reference to drawings showing embodiments thereof.

FIG. 1 is an enlarged perspective view showing a portion of an optical recording medium according to the present invention.

For example, a spiral groove 2 is formed on one side of the disk-shaped substrate 1.
is formed. Bit P between adjacent grooves 22
This is the land 3 where information is recorded. The width of this land 3 is more than twice the width of the groove 2. And land 3 has multiple channels C,...
Information on C2, C3...C8 is recorded in parallel.

In the groove 2, header information such as the trunk address and sector address of the information to be recorded in the land 3 is roughly recorded.

When reproducing the recorded information recorded on the optical recording medium in this way, the optical head that projects the light onto the groove 2 and the information recording position of the plurality of channels CC2, C3...C8 of the land 3 are individually set. A plurality of optical heads for projecting light are provided to simultaneously project light onto the grooves 2 and lands 3 of the rotating substrate l, and the reflected light is detected separately based on the signal related to the header information. Information from multiple channels can be played simultaneously.

In this way, if the information to be recorded is separately recorded on land 3 and the header information such as the track address and sector address of that information is separately recorded on groove 2, the information recorded on land 3 will no longer include the bottom information. This increases the information recording density of the land 3 in the circumferential direction. On the other hand, by making the width of the land 3 more than twice the width of the groove 2, the number of grooves 2 is reduced and the area occupied by the land 3 is increased. This increases the information recording density also in the radial direction of the land 3. Therefore, the information recording capacity of the optical recording medium is significantly increased, and an optical recording medium with an extremely large information recording capacity can be provided.

In this embodiment, the grooves 2 have a spiral shape, but the same effect can be obtained even if the grooves 2 are formed concentrically.

[Effects of the Invention] As described in detail above, the present invention records header information in the groove, thereby increasing the information recording density in the circumferential direction of the land. Furthermore, by making the land width at least twice the groove width, the area occupied by the land can be increased and the information recording density in the radial direction of the land can be increased. As a result, an excellent effect can be obtained in that an optical recording medium having an extremely large information recording capacity can be obtained.

[Brief explanation of drawings]

FIG. 1 is an enlarged perspective view showing a portion of an optical recording medium according to the present invention, and FIG. 2 is an enlarged perspective view showing a portion of a conventional optical recording medium. 1...Substrate 2...Groove 3...Land P
. . . bits In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In an optical recording medium comprising concentric or spiral grooves and a land between adjacent grooves on which information is to be recorded, the land has a width dimension of the groove. It is characterized by having a width dimension that is more than twice that, on which information of a plurality of channels is recorded in parallel, and in the groove, header information such as a track address and a sector address of the recorded information is recorded. optical recording medium.