Device for controlling pickup arm movement in linear tracking pickup arm apparatus

摘要

A device for controlling movements of pickup arm in linear tracking pickup arm apparatus comprises an offset angle detecting mechanism of photo-electricity conversion type for detecting a horizontal offset of the arm and a servo mechanism for correcting the arm offset. The servo mechanism is disabled by turning-off a light-emitting element in the detecting mechanism when the pickup arm is at an uplifting position as well as at limiting end positions in a horizontal arm travel. The initiation of the servo action of the mechanism is effected gradually by gradual illumination of the light-emitting element.