CONTROL CIRCUIT FOR OPTICAL DISK RECORDING AND REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a control circuit for an optical disk recording and reproducing device constituted so that a signal is recorded in a disk by a laser beam emitted form an optical pickup. SOLUTION: This device is constituted so that the temperature of an optical pickup 2 is detected and focus control operation is performed by adding an offset signal to a focus servo system based on the detected temperature. Thereby, even if the temperature of an optical pickup is varied and a wavelength of laser beam is varied, a laser beam can be focused at a signal plane of the disk.