JP2001043536A - Optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record TOC(table of content) information in high density. SOLUTION: Laser power at the time of recording and laser power at the time of reproduction are recorded with a prescribed frequency as a wobble 93 provided in the groove 92 of an optical disk. The range of the frequency of the wobble is 200 KHz. Also, TOC information excepting laser power is recorded into a land 91 and the groove 92 as a pit string 94. The length of a TOC zone is nearly 160 llm from the beginning end side of a track. The TOC information recorded by the wobble and the pit string is reproduced by irradiation with laser beams.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording medium such as an optical disk having a waveform pregroove, and more particularly to a recording medium suitable for a recordable CD disk and a recordable magneto-optical disk.

[0002]

2. Description of the Related Art In a mini disk, a groove having a waveform shape of a signal obtained by FM-modulating a carrier serving as a rotation synchronizing signal with address information is cut and used for rotation control and detection of address information. This method is generally called a wobbling method. Also, a wobbling method has been proposed in an optical disc apparatus in which recording is performed on a groove and a land between the grooves on an optical disc in which a groove having a waveform shape of a signal obtained by FM-modulating a carrier serving as a rotation synchronization signal with address information is formed. ing. In this case, as a method of reading address information, a laser beam emitted from a laser light source of an optical pickup is divided into a main beam and two sub beams by a diffraction grating.
As shown in FIG. 2, when the main beam is track-controlled at the center of the groove, address information is read from a push-pull signal from the main beam, and when the main beam is controlled at the center of the land, as shown in FIG. ,
A method for reading address information from a push-pull signal from a sub-beam (Japanese Patent Laid-Open No. 7-14172) is known.

[0003]

However, in the conventional optical disk, the TOC information can be recorded at a high density by recording the TOC information in both wobbles and pit rows, and the TOC information can be recorded at a high speed during reproduction. Nothing was configured to be able to play.

[0004]

According to the present invention, there is provided an optical disk capable of recording and / or reproducing data on and from a land and a groove, wherein the groove is formed as a first wobble.
And the TOC information formed as wobbles or pit trains. The land includes second address information in which wobbles provided in grooves located on both sides of the lands have the same waveform, and pit trains as pit trains. And the formed TOC information.

Further, according to the present invention, in an optical disc capable of recording and / or reproducing data on and from a land and a groove, the groove has a first address information formed as a wobble and a T address formed as a wobble or pit row.
The land includes second address information in which wobbles provided on grooves located on both sides of the land have the same waveform, and TOC formed as a pit row.
And wobble is also provided in a data recording area of the groove or the land.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the present invention, a TOC (Table of Command) provided on the starting end side of a track is used.
An example of a recordable and / or reproducible optical disc having a wobble in an (entent) area will be described. Referring to FIG. 1, of the laser power at the time of recording, the laser power at the time of reproduction, the rotation speed of the optical disk, etc., which are information to be described in the TOC area, the laser power at the time of recording and the laser power at the time of reproduction are defined as wobble. An optical disc in which information is recorded and other information is recorded as a pit row on a flat portion of a groove or land will be described. The laser power at the time of recording and the laser power at the time of reproduction are recorded at a predetermined frequency as a wobble 93 provided in a groove 92 of the optical disc. The wobble frequency ranges from 200 kHz to 10 MHz. The TOC information other than the laser power is recorded as pit rows 94 in the lands 91 and the grooves 92. The length of the TOC area is about 160 μm from the start of the track.
The TOC information recorded by wobbles and pit strings is reproduced by irradiating a laser beam.

[0007]

As described in detail above, according to the present invention, T
By recording OC information in both wobbles and pit rows, TOC information can be recorded at a high density, and TOC information can be reproduced at high speed during reproduction.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of an optical disk according to the present invention.

FIG. 2 is a diagram illustrating a tracking control method and an address detection method for recording and reproducing lands and grooves using three beams according to a conventional method.

[Explanation of symbols]

 91 lands 92 grooves 93 wobbles 94 pit rows

 ──────────────────────────────────────────────────続 き Continued on the front page (31) Priority claim number Japanese Patent Application No. 8-301426 (32) Priority date November 13, 1996 (November 13, 1996) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-6988 (32) Priority date January 17, 1997 (Jan. 17, 1997) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-12790 (32) Priority date January 27, 1997 (Jan. 27, 1997) (33) Countries claiming priority Japan (JP) (31) No. of priority claim No. 9-25655 (Japanese Patent Application No. 9-25655) 32) Priority date February 7, 1997 (February 27, 1997) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-56681 (32) Priority date 1997 March 11 (March 11, 1997) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-95700 (32) Priority date April 14, 1997 (1997. 4.14) (33) Priority Claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-106368 (32) Priority date April 23, 1997 (April 23, 1997) (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-109436 (32) Priority date April 25, 1997 (April 25, 1997) (33) Priority claim country Japan (JP) (31) Priority claim number Japanese Patent Application No. 9-140087 (32) Priority date May 29, 1997 (May 29, 1997) (33) Countries claiming priority Japan (JP) (72) Inventor Noboru Mamiya Keihanhondori, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Koji Uchihara 2-5-5 Sanyo Electric Co., Ltd., Sanyo Electric Co., Ltd. 2-5-5 Sanyo Electric Co., Ltd. Moriguchi, Osaka (72) Inventor Satoshi Sumi Moriguchi, Osaka 2-5-5 Keihan Hondori Sanyo Electric Co., Ltd. (72) Inventor Kenji Nakao 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Toshiaki Hioki Osaka 2-5-5 Keihanhondori, Moriguchi City Sanyo Electric Co., Ltd. (72) Inventor Hisashi Matsuyama Osaka Prefecture Moriguchi Keihanhondori 2-chome No. 5 No. 5 Sanyo within Co., Ltd. (72) inventor Yoshihiro Hori Osaka Prefecture Moriguchi Keihanhondori 2-chome No. 5 No. 5 Sanyo Electric Co., Ltd. in

Claims (2)

[Claims] 1. An optical disc capable of recording and / or reproducing information on and from a land and a groove, wherein the groove includes first address information formed as a wobble and TOC information formed as a wobble or a pit string. An optical disk, wherein the land includes second address information in which wobbles provided on grooves located on both sides of the land have the same waveform, and TOC information formed as a pit row. 2. An optical disc capable of recording and / or reproducing information on and from a land and a groove, wherein the groove includes first address information formed as a wobble and TOC information formed as a wobble or a pit string. The land includes second address information in which wobbles provided on grooves located on both sides of the land have the same waveform, and TOC information formed as a pit row, and a data recording area of the groove or the land. An optical disc characterized by having a wobble.