Spot position-discriminating system and method for discriminatin

Details Spot position-discriminating system and method for discriminatin Spot position-discriminating system and method for discriminatin

1997-11-26

1999-07-27

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4441, G11B 709

Patent

active

059302135

ABSTRACT:
It is an objection of the invention to provide a rewritable optical disk system, which can discriminate the position of a spot on an optical disk by detecting the difference in a intensity distribution of a reflected light from the optical disk between a land track and a groove track. The spot positions detected by partially detecting the intensity distribution of the reflected light in a condition that the spot on the optical disk is lightly defocused, and thereby the difference in the intensity distribution of a reflected light between the land and groove tracks can be discriminated.

REFERENCES:
patent: 5278401 (1994-01-01), Takishima et al.
patent: 5459705 (1995-10-01), Matoba et al.
patent: 5504725 (1996-04-01), Katsumata
patent: 5734633 (1998-03-01), Aoki et al.
patent: 5784347 (1998-07-01), Miyamoto et al.
Patent Abstracts of Japan; vol. 095, No. 006, Jul. 31, 1995 & JP 07 057279 A (Ricoh Co. Ltd.), Mar. 3, 1995, abstract.

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