Patent ID: 6690632
Filing Date: 2004-02-10
Classification: G11B

Abstract:
A tilt servo apparatus comprising:photodetecting means for detecting a reflected light beam of a laser beam irradiated to an optical recording medium, tilt error correcting means for correcting a tilt error occurring due to a tilt angle which is formed between an optical axis of said laser beam and a direction normal to said optical recording medium at said laser beam irradiating position, control means for controlling said tilt error correcting means on the basis of a detection signal intensity of said photodetecting means, correction value changing means for changing a correction value of said tilt error correcting means by a first correction width; comparing means for comparing an amount of change of said detection signal intensity when said correction value is changed by said first correction width with a predetermined amount of change; and correction width changing means for changing said first correction width on the basis of the comparison result of said comparing means.