Patent ID: 7715288
Filing Date: 2010-05-11
Classification: G11B

Abstract:
1. An optical disk apparatus which radiates a laser beam on an optical disk and reads out data from the optical disk, comprising: an optical pickup head which outputs the laser beam through an objective lens; a laser control unit which controls the laser beam which is radiated from the optical pickup head; a focus adjustment unit which moves the objective lens in a direction toward the optical disk with a control of a focus driving voltage, thereby adjusting focusing; a memory unit which stores the focus driving voltage; a movement unit which moves the optical pickup head in a radial direction of the optical disk; a rotation unit which rotates the optical disk; and a control unit which moves, when an instruction to halt data read-out from the optical disk is received from an external apparatus, the optical pickup head to a predetermined position, stores the focus driving voltage corresponding to a position of the objective lens in the memory unit, and controls the laser control unit to halt the radiation of the laser beam from the optical pickup head, and which controls, when an instruction to resume the data read-out is received from the external apparatus, the laser control unit to resume the radiation of the laser beam from the optical pickup head, and sets the focus driving voltage of the focus adjustment unit on the basis of the focus driving voltage that is stored in the memory unit, wherein the focus adjustment unit starts a focus search by using the focus driving voltage, moves the objective lens in the direction toward the optical disk, and achieves focus adjustment.