Optical disk having predetermined cross-track signal, cross-trac

Details Optical disk having predetermined cross-track signal, cross-trac Optical disk having predetermined cross-track signal, cross-trac

1995-03-22

1996-12-10

Nelms, David C.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, 3692752, G11B 709

Patent

active

055838472

ABSTRACT:
A high density optical disk having data tracks and pre-grooves disposed in a track pitch not higher than 1.2 .mu.m provides groove signals to a disk drive having a two-divided optical detector for tracking control. The groove signal characteristics of the optical disk is such that an envelope cross-track signal, an envelope cross-track minimum signal and an envelope push-pull signal are not less than 0.10, not less than 0.12 and between 0.10 and 0.70, respectively, when normalized by a virtual mirror surface. The optical disk may be any of a magneto-optical (MO) disk, a ROM disk and a partial ROM disk and can provide any type of disk drives with sufficient groove signals for tracking control in both a magneto-optical area and a ROM area.

REFERENCES:
patent: 4750162 (1988-06-01), Tajima
patent: 5353277 (1994-10-01), Yasuda et al.

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