Patent ID: 7843778
Filing Date: 2010-11-30
Classification: G11B

Abstract:
1. An optical disc apparatus comprising: a drive control section to control an actuator by generating a voltage indication value indicative of a drive voltage applied to the actuator, said actuator driving an objective lens; an indication value detection section to periodically detect said voltage indication value; a mode determination section to go into an excess detection mode when the voltage indication value is detected to be outside a predetermined tolerable range, and to start a re-detection period when the voltage indication value is detected to be inside said tolerable range, and to remain in said excess detection mode and extend the re-detection period when the voltage indication value is detected again during said re-detection period to be outside said tolerable range, and to stop said excess detection mode when the voltage indication value is not detected again during said re-detection period to be outside said tolerable range; and an indication value limitation section to limit said voltage indication value when staying in said excess detection mode for longer than a predetermined fail-safe action start period.