Patent ID: 7859954
Filing Date: 2010-12-28
Classification: G11B

Abstract:
1. An optical disk apparatus for forming a visible image by irradiating a laser beam along an optical axis onto an optical disk while rotating the optical disk, the optical disk apparatus comprising: an optical pickup arranged to irradiate a laser beam onto the optical disk, the optical pickup having a focus actuator and an objective lens held by the focus actuator; a focus controller that controls the focus actuator to move the objective lens in a direction of the optical axis of the laser beam for focus control: an acquiring section that acquires a content of the focus control by operating the optical pickup to irradiate the laser beam onto a predetermined area of the optical disk and by monitoring a return light from the predetermined area of the optical disk: and a memory that stores the content of the focus control acquired by the acquiring section, wherein the focusing controller controls, when a visible image is actually formed, the focus actuator on the basis of the content of the focus control stored in the memory to move the objective lens in the direction of the optical axis of the laser beam.