Patent ID: 7701818

Claim:
An optical disk apparatus, comprising: a motor for driving an optical disk at a predetermined rotation speed; an optical pickup for irradiating a light beam of a semiconductor laser upon a recording surface of the optical disk rotationally driven by said motor, and for producing a RF signal upon receipt of a reflection light from said recording surface; a controller for controlling a focus condition of said optical pickup upon basis of said electrical signal produced, so that a tracking servo-error level comes to be maximum; a signal processor portion for amplifying the RF signal reproduced from said optical disk; and an equalizer being provided in a part of said signal processor portion, for lifting up high-frequency signals of said RF signal by a predetermined level, wherein said controller changes an amount of lifting by means of said equalizer depending upon a difference between a focus offset amount at which said RF signal reproduced comes to be maximum and a focus offset amount at which jitter of said RF signal reproduced come to be minimum.