TRACKING CONTROL ARRANGEMENTS FOR USE IN OPTICAL DISC PLAYERS

摘要

A tracking control arrangement for use in an optical disc player comprises a photodetector for receiving a light beam reflected from an optical disc on which an information signal is recorded in a record track, a signal generating circuit for generating a reproduced information signal and a tracking error signal from the output of the photodetector, and 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. A driving circuit drives 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 detects a variation in the reproduced information signal resulting from the condition in which the light beam reflected from a blank area in the record track is received by the photodetector, and a gain controller varies the gain of transmission of the modified tracking error signal from the modifier to the driver in response to a predetermined detection output of the detector.