Patent ID: 7796476
Filing Date: 2010-09-14
Classification: G11B

Abstract:
1. An optical disk device comprising: an optical pickup head which emits a laser beam to an optical disk and detects light reflected from the optical disk; a signal output unit configured to output at least a servo signal and an RF signal in accordance with the light detected by the optical pickup head; a determination unit configured to determine whether the optical disk is an H-to-L disk in which a light reflectance is lower in a data recorded region than in a data unrecorded region or an L-to-H disk in which the light reflectance is higher in the data recorded region than in the data unrecorded region from identification information recorded on the optical disk; a gain adjustment value memory which stores a gain adjustment value; a gain control unit which is configured to: a gain adjustment unit configured to execute automatic servo gain adjustment of the servo signal by using the first, second, third, or fourth adjusted gains set in the servo gain adjustment memory, according to the type of the optical disk and whether the region is the data recorded region or the data unrecorded region in reproducing the optical disk.