OPTICAL HEAD AND TANGENTIAL TILT COMPENSATING DEVICE

摘要

PROBLEM TO BE SOLVED: To compensate deviation of orthogonal relation between an optical disk and an optical axis of the light beam irradiating the disk in the direction of the circumference of a circle (tangential direction) corresponding to variation of tilt of an optical disk in one rotation of an optical disk. SOLUTION: A tilt calculating means 14 detects a signal of a driving current of a focus actuator from a servo circuit driving a focus actuator, calculates tilt compensation quantity accordance with design conditions of a focus actuator of an optical head, outputs it as compensation voltage, applies it to a tilt driving device 12 of an object lens, and deviation of orthogonal relation in the tangential direction between an optical disk and an optical axis of a light beam irradiated to an optical disk is compensated by tilting an optical axis of a light beam irradiated from an object lens being proportional to the voltage.