G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/08 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 19/04 (2006.01)
Patent
CA 1314983
ABSTRACT OF THE DISCLOSURE An optical information processing apparatus comprises an optical head having an optical system contained in a frame and effecting at least one of recording and reproduction of information by applying a light beam condensed by the optical system to a recording medium, a detector for detecting at least one of a tracking signal and a focusing signal, a controller for moving at least a portion of the optical system in accordance with at least one of the tracking signal and the focusing signal, a detector for detecting the position of the moving portion of the optical system relative to the frame, a position controller for controlling the moving portion so as to be held in a predetermined position, on the basis of the output signal of the position detecting detector, a detector for detecting the abnormality of at least one of the tracking and focusing controls, and a switching device for alternatively operating the tracking and focusing controller and the position controller and rendering the tracking and focusing controller inoperative and operating the position controller when the abnormality of the tracking or focusing controll is detected.
573475
Kanda Shigeto
Kitai Hiroto
Yamada Etsuo
Canon Kabushiki Kaisha
Ridout & Maybee Llp
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