System for obtaining optimum focusing position in optical disc s

Details System for obtaining optimum focusing position in optical disc s System for obtaining optimum focusing position in optical disc s

1989-06-28

1992-08-25

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 4432, 369 4434, 369 4431, 369 4437, G11B 509

Patent

active

051425203

ABSTRACT:
A system for obtaining an optimum focusing position in an optical disc system. An optical beam is impinged onto a track of an optical disc, and a reflection signal having information regarding an intensity of an optical beam reflected by an optical disc is obtained. A predetermined frequency component, the frequency component being generated by a modulation caused by an existence of a pit on a track of the optical disc in a reflecting signal, is extracted from the reflection signal. Then a focus position in which a maximum intensity of the extracted frequency component is obtained is searched by changing the focus position of the optical beam. Further, the above system is incorporated in a focus servo control system for maintaining an optimum focusing position in an optical disc system during reading and writing operations, to determine an optimum offset value which is to be adjusted to compensate an error arisen from a construction of the focus servo control system, during an offset adjusting operation.

REFERENCES:
patent: 4346471 (1982-08-01), Hirasawa et al.
patent: 4357696 (1982-11-01), Bierhoff
patent: 4379256 (1983-04-01), Maury
patent: 4419701 (1983-12-01), Harrison et al.
patent: 4613916 (1986-09-01), Johnson
patent: 4633453 (1986-12-01), Ogawa
patent: 4669072 (1987-05-01), Miura et al.
patent: 4707648 (1987-11-01), Minami
patent: 4736354 (1988-04-01), Yoshio
patent: 4747089 (1988-05-01), Eguchi et al.
patent: 4855983 (1989-08-01), Arai

Affiliated with

Also associated with

Rating

System for obtaining optimum focusing position in optical disc s does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for obtaining optimum focusing position in optical disc s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for obtaining optimum focusing position in optical disc s will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-390915