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1. (WO2003079335) INFORMATION RECORDING MEDIUM, AND INFORMATION RECORDING/REPRODUCING DEVICE AND METHOD

Pub. No.:    WO/2003/079335    International Application No.:    PCT/JP2003/003102
Publication Date: Sep 25, 2003 International Filing Date: Mar 14, 2003
IPC: G11B 20/12
G11B 20/18
Applicants: KABUSHIKI KAISHA TOSHIBA

ANDO, Hideo

WATABE, Kazuo

SATO, Hiroharu

YAMADA, Hisashi

NAGAI, Yuuji

NODA, Chosaku

KASHIHARA, Yutaka

OGAWA, Akihito

KOJIMA, Tadashi

Inventors: ANDO, Hideo

WATABE, Kazuo

SATO, Hiroharu

YAMADA, Hisashi

NAGAI, Yuuji

NODA, Chosaku

KASHIHARA, Yutaka

OGAWA, Akihito

KOJIMA, Tadashi

Title: INFORMATION RECORDING MEDIUM, AND INFORMATION RECORDING/REPRODUCING DEVICE AND METHOD
Abstract:
An information recording medium (1) has a track for recording information. The track is composed of a groove portion (2) and a land portion (3). The groove portion (2) has a synchronous structure where wobbles (2a, 2b) on both sidewalls of the groove are not shifted from each other in the circumferential direction (in the drawing, the vertical direction). The wobbles on both sidewalls of the land of the land portion (3) constitute an asynchronous structure. Favorable reproduction signals can be generated from the groove portion (2) and the land portion (3).