OPTICAL DISK DEVICE, METHOD FOR COMPUTING QUANTITY OF LENS SHIFT, MEDIUM AND INFORMATION CLUSTERS

摘要

PROBLEM TO BE SOLVED: To solve the problem that it is not possible to obtain an accurate quantity of lens shift and stably execute recording and reproducing by means of a usual optical disk device. SOLUTION: This optical disk device is characterized in that is comprises an optical head 101 that has a convergent lens 103 for converging light from a laser diode 104 to an optical disk 115 and a photo-detector 105 for detecting the light which is converged and reflected by the optical disk 115, an RF amplifier 106 which generates a tracking error signal for executing tracking control by making use of the detected light, a tilt sensor 108 for detecting a disk tilt DT and a servo processor 109 which computes the quantity LS of the lens shift according to a prescribed rule based on the tracking error signal thus generated and the detected disk tilt DT.