Optical disc playback device including detecting and correcting

Details Optical disc playback device including detecting and correcting Optical disc playback device including detecting and correcting

1989-09-27

1992-08-18

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4478, G11B 7095

Patent

active

051405750

ABSTRACT:
An optical disc playback device capable of detecting a state of a disc which is not set in a normal position on a turntable includes a system control circuit for clamping an optical disc set on a turntable and rotating the optical disc with an optical head being at a standstill in radial direction of the optical disc in a focus-on state, a track crossing detection circuit for detecting a track crossing state of a laser beam spot from a detection signal of the optical head, a track crossing occurrence frequency detection circuit for detecting frequency of occurrence of track crossing detected by the track crossing detection circuit, an abnormal-state-of-mounting judging circuit for judging existence of an abnormal state of mounting of the disc on the turntable if the frequency of occurrence of track crossing is higher than a value set as indicating the abnormal state of mounting, and an abnormal-state-of-mounting elimination control circuit for performing, when the abnormal state of mounting has been detected, stopping of the optical disc or displaying of the abnormal state of mounting or other control necessary for eliminating the abnormal state of mounting.

REFERENCES:
patent: 4365324 (1982-12-01), Michaelis
patent: 4775966 (1988-10-01), Miura et al.
patent: 4805163 (1989-02-01), Ohnuki
patent: 4829501 (1989-05-01), Seto et al.

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