Apparatus for detecting moving direction of light beam spot illu

Details Apparatus for detecting moving direction of light beam spot illu Apparatus for detecting moving direction of light beam spot illu

1990-01-24

1991-06-04

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4413, 369 43, G11B 700

Patent

active

050220217

ABSTRACT:
An apparatus for detecting a moving direction of a light beam spot illuminated on an optical information recording medium having tracks, in which moving direction identifying signals are obtained in synchronized with a leading edge and a trailing edge of a tracking error signal and a prohibit signal for prohibiting to write and rewrite information of the moving direction of the light beam spot is generated in accordance with the moving direction identifying signals. In the apparatus according to the invention, writing and rewriting the information of the moving direction of the light beam spot is prohibited when the two moving direction identifying signals denote opposite moving directions, so that the moving direction of the light beam spot on the optical information recording medium can be detected without being influenced by a prepit, a dust or a flaw formed in the optical information recording medium.

REFERENCES:
patent: 4539664 (1985-09-01), Deguchi et al.
patent: 4740940 (1988-04-01), Tanaka et al.
patent: 4751695 (1988-06-01), Kaku et al.
patent: 4797872 (1989-01-01), Rokutan
patent: 4866688 (1989-09-01), Ohtake et al.

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