TILT CONTROLLER AND OPTICAL DISK DEVICE

摘要

PROBLEM TO BE SOLVED: To suppress the interference with the track operation occurring in tilt operation even with an optical disk device of which the principal point of an objective lens and the center of rotation of the tilt operation are not aligned. SOLUTION: A tilt error signal is compensated to apply tilt servo by using the tilt controller comprising a filter element which does not permeate the signal component near the primary resonance frequency of a tilt actuator, a filter element which amplifies the signal by a band below a medium rotating frequency and a means which controls the current value to be energized to a tilt drive coil.