Patent ID: 6430130
Filing Date: 2002-08-06
Classification: G11B

Abstract:
A tilt servo control apparatus comprising:an optical pickup for irradiating an optical beam onto an optical disk and detecting a reflected light from the optical disk; a tilt-correction unit for correcting, using a correction amount, a tilt error due to aberration caused by a tilt angle formed between an optical axis of the optical beam and a normal line of the optical beam at an irradiated position on the optical disk; an amplitude detecting unit for detecting a maximum amplitude and a minimum amplitude of a detected signal by the optical pickup within a period of one rotation of the optical disk; and a tilt-correction controlling unit for providing a control signal to control the correction amount used in the tilt-correction unit, the tilt-correction controlling unit comprising unit for applying variations to the control signal and adjusting the control signal so that a difference between the maximum amplitude and the minimum amplitude is minimized responsively to the variations.