Patent ID: 7016272
Filing Date: 2006-03-21
Classification: G11B

Abstract:
1. An optical disk device for writing on and/or reading from an optical disk information by focusing a light spot from an optical pickup onto the optical disk, said optical disk device comprising: a tracking adjustment system that performs tracking adjustment of said optical pickup with respect to said optical disk; a sled adjustment system that adjusts a sled position of said optical pickup; and a control means that controls said tracking and sled adjustment systems, wherein said sled adjustment system and said tracking adjustment system are controlled independently, and wherein said disk device further comprises: an offset value acquisition means that detects at prescribed intervals a tracking drive signal output from said tracking adjustment system and acquires signal values of the tracking drive signal as tracking drive offset values; an offset representative value computation means that computes an offset representative value based on multiple tracking drive offset values for one lap of said optical disk that are acquired by said offset value acquisition means; an offset value comparison means that compares an offset center value, which is the tracking drive offset value in the state in which no tracking adjustment control is performed, and the offset representative value computed by said offset representative value computation means; and a sled drive decision means that decides, based on the comparison result by said offset value comparison means, whether to drive said sled adjustment system.