Servo apparatus and flaw detecting apparatus therefor for...

Details Servo apparatus and flaw detecting apparatus therefor for... Servo apparatus and flaw detecting apparatus therefor for...

G - Physics

11

B

352/32.1

G11B 7/00 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1213046

ABSTRACT OF THE DISCLOSURE 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 were detected, a driving signal of a driving device for the pickup is held to a fixed potential.

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