Defect detection circuit for optical pick up device

Details Defect detection circuit for optical pick up device Defect detection circuit for optical pick up device

1991-06-26

1993-03-16

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4425, 369 4432, G11B 700, G11B 7095

Patent

active

051950766

ABSTRACT:
A defect detection circuit for optical pick up device having a record medium on which a track is formed which track has a plurality of segments formed in series along the track. The circuit comprises a first detection circuit for detecting a defect of a segment sampled to be detected by comparing difference between a latest data of a refresh signal from the segment and a preceding data of a refresh signal from a preceding segment sampled before the segment to be detected with a first predetermined value. The circuit further comprises a second detection circuit for detecting a defect of the segment to be detected by comparing the latest data with a second predetermined value and a discrimination circuit for discriminating whether the segment is defective or not.

REFERENCES:
patent: 4748609 (1988-05-01), Yonezawa et al.
patent: 4785442 (1988-11-01), Ohtake et al.
patent: 4847822 (1989-07-01), Takasugi et al.
patent: 4872152 (1989-10-01), Tsuyoshi et al.
patent: 4972398 (1990-11-01), Wachi

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