Tracking control arrangements for use in optical disc players

Details Tracking control arrangements for use in optical disc players Tracking control arrangements for use in optical disc players

G - Physics

11

B

352/32.2

G11B 7/09 (2006.01)

Patent

CA 1240042

TRACKING CONTROL ARRANGEMENTS FOR USE IN OPTICAL DISC PLAYERS ABSTRACT OF THE DISCLOSURE A tracking control arrangement for use in an optical disc player comprises a photodetector for receiving a light beam reflected at an optical disc on which an information signal is recorded in a record track, signal generating circuit for generating a reproduced information signal and a tracking error signal from the output of the photodetector, a modifier for modifying the tracking error signal in response to variations in the total quantity of light of the light beam received by the photodetector, driving means for driving an optical device to maintain the light beam in a proper tracking relation to the record track in response to the modified tracking error signal, a detector for detecting a variation in the reproduced information signal resulting from the condition in which the light beam reflected at a blank area in the record track is received by the photodetector, and a gain controller for varying the gain of transmission of the modified tracking error signal from the modifier to the driving means in response to a predetermined detection output of the detector. -i-

482060

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