Disc playback apparatus

Details Disc playback apparatus Disc playback apparatus

1983-08-26

1987-07-21

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369 58, G11B 2110

Patent

active

046823140

ABSTRACT:
In a disc playback apparatus using an optical pickup or the like, any flaws on a track of the disc are detected using: a first level detector for detecting a maximum value level of a recording information signal of an output of the pickup; a second level detector for detecting a change of the maximum value level of the recording information signal; and a comparator for comparing outputs of the above first and second level detectors. When any flaws are detected, a driving signal of a driving device for the pickup is held to a fixed reference potential.

REFERENCES:
patent: 3912858 (1975-10-01), Kenney
patent: 4297676 (1981-10-01), Moriya et al.
patent: 4362996 (1982-12-01), Priebe
patent: 4520469 (1985-05-01), Todokoro et al.
patent: 4525823 (1985-06-01), Sugiyama et al.

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