Patent ID: 7940611
Filing Date: 2011-05-10
Classification: G11B

Abstract:
1. An optical disc apparatus including a function of monitoring a current flowing in an actuator provided in an optical pickup, the optical disc apparatus comprising: a disc motor for rotationally driving the optical disc; a motor controller for controlling a rotation speed of the disc motor; an overcurrent detector for detecting an overcurrent flowing in the actuator and instructing the disc motor to stop operating and exert brake force based on the result of the detection; an actuator controller for controlling the actuator to cause an objective lens to be in a retracted state under the condition that an operation for controlling a focus of the objective lens is stopped, the objective lens being separated from a recording surface of the optical disc in the retracted state; and a rotation speed detector for detecting a rotation speed of the optical disc or the rotation speed of the disc motor; wherein when an overcurrent is detected in the actuator under the condition that a recording operation or reproduction operation is performed and the focus of the objective lens is controlled, the rotation speed of the optical disc is reduced, the actuator is controlled to cause the objective lens to be in the retracted state under the condition that the disc motor stops operating and exerts brake force, and the operation for controlling the focus of the objective lens is stopped, the objective lens being separated from the recording surface of the optical disc until the rotation speed of the optical disc becomes equal to or smaller than a predetermined value, and when the rotation speed of the optical disc is equal to or smaller than the predetermined value, the objective lens is released from the retracted state.