OPTICAL ELEMENT FEEDING DEVICE DRIVING METHOD AND OPTICAL DISK APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an optical disk apparatus capable of detecting biting in a stepping motor and conducting restoration.

SOLUTION: The optical disk apparatus includes: an optical element feeding device including a movable frame 10 for supporting a spherical aberration correcting lens 5 to move the lens in optical axis direction; a spring for applying force to the frame 10 in the direction; a sensor 8 for detecting the reference position of the lens 5; a stepping motor 13; a feeding device for optical elements having a lead screw 4 and a nut 15 for converting the rotation of the motor 13 into the direction; a stepping motor driving circuit 17; a decision circuit 21 for judging abnormality when an output of the sensor 8 does not change even if the driving circuit 17 outputs a driving signal to the stepping motor 13 after the detection of the reference position of the lens 5 by the sensor 8; and a driving frequency changeover circuit 22 for lowering a driving frequency of the stepping motor 13 than in ordinary operation, based on an abnormality signal from the decision circuit 21.

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