Patent ID: 7995429
Filing Date: 2011-08-09
Classification: G11B

Abstract:
1. A tilt control method in an optical disk device for irradiating a laser beam onto a layer of an optical disk having a plurality of recording/reproducing layers for recording information or reproducing information, said optical disk device comprising an objective lens to focus said laser beam onto an information recording surface of said optical disk, a tilt actuator for tilting said objective lens, and a tilt controller which controls said tilt actuator, said method comprising: setting said tilt actuator with a plurality of tilt values as an inclination of the optical disk relative to an optical axis of the laser beam; detecting signals corresponding to said plurality of tilt values for a certain recording/reproducing layer in the optical disk; obtaining a corrected tilt value according to said signals; and applying said corrected tilt value obtained for said certain recording/reproducing layer to other recording/reproducing layers in said optical disk.