Patent ID: 7313058

Claim:
An optical disk device, comprising: a light-emitting element configured to emit a light beam to an optical disk having a ZCLV zone; a ZCLV border detector configured to detect a border of the ZCLV zone; a rotation controller configured to control rotation speed of the optical disk, the rotation speed being adjusted based on a detection of the border of the ZCLV zone by the ZCLV border detector and the rotation speed being kept constant without the detection; a zone correspondence table expressing the ZCLV zone and a tilt zone including a border corresponding to a border of the ZCLV zone in correspondence; a tilt border detector configured to detect a border of the tilt zone based on the zone correspondence table; and a tilt controller configured to control inclination of an optical head, the inclination being adjusted based on a detection of the border of the tilt zone by the tilt border detector and the inclination being kept constant without the detection.