OPTICAL DISK APPARATUS

摘要

An optical disk apparatus has a galvanic mirror error signal generation circuit for detecting when the galvanic mirror rotates more than an allowed limit value in directions P and Q. When it is detected by the galvanic mirror error signal generation circuit that the galvanic mirror has rotated more than the allowed limit value the light intensity of the light spot is changed from the recording-use (or erasing-use) light intensity into the reproduction-use light intensity. Accordingly, the recording and erasing of information is always carried out by the projection of the light beam having a predetermined light intensity, thereby always providing a high grade of optical disk apparatus.