JPS6459631A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the degradation or damage of a recording film during standby state for a long period of time by providing a means avoiding radiation by a laser beam to areas other than a servo area, a track address and an ID area recorded with control information in the standby state. CONSTITUTION:A controller 114 issues a standby signal (a) at H level, a laser-on signal (b) at H level and a read signal (c) at L level in the standby and an output of an AND gate 112 is at L. When one of outputs of a synchronizing detection circuit 119 and a servo detection circuit 118 is at H, the output of a NOR 113 is at L, the output of a NAND 112 is at H and the output of an AND 111 is at H and the laser element 110 is driven in the servo or ID region in the intensity at read. When the outputs of the circuits 119, 118 are both L, the output of the AND 111 is at L in said information area, the laser irradiation is stopped and no recording film is damaged. On the other hand, a tracking focus servo circuit 121 keeps the servo information of the servo area and supplies the result to an actuator driving circuit 116, the out of focus of the tracking servo is hardly occurred.