Patent ID: 7336570

Claim:
A disk recording and/or reproducing apparatus comprising: a spindle chassis for rotationally supporting a turntable on which an optical disk, to/from which information is recorded and/or reproduced, is placed; a pickup chassis, rotationally supported on said spindle chassis, for movably supporting an optical pickup device for writing and/or reading said information to/from said optical disk and being movable toward and away from the turntable; and a tilt mechanism for adjusting a tilt angle of said optical pickup device with respect to said optical disk by rotating said pickup chassis with respect to the spindle chassis, said tilt mechanism comprising: a stepping motor for rotating said pickup chassis with respect to said spindle chassis; and a control circuit for driving said stepping motor to set the tilt angle at a predetermined neutral position without a tilt sensor input; wherein said control circuit drives said stepping motor to obtain a reference position by causing a loss of synchronism of said stepping motor.