TILT DETECTING DEVICE AND OPTICAL DISK DEVICE, TILT CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To improve the quality of a light spot and recording and reproducing characteristics of a device by correcting the inclination of an optical disk to the optical axis of a light spot at respective radial positions of the inner periphery, the middle periphery and the outer periphery of the disk so that detected values of a tilt detecting means become proper values. SOLUTION: The tilt of an optical disk 101 is detected by comparing the amplitude of a front half part with that of a rear part or the level (lower envelope) of a lower side signal or the level (upper envelope) of an upper side signal of reproduced signals being sum signal outputs of a bisected photodetector when staggered mark shaped continuous pits which are previously prepitted on the optical disk 101 are reproduced in a tracking-on state.