Patent ID: 7675832

Claim:
An optical disk apparatus for conducting recording or reproducing on an optical disk, the optical disk apparatus comprising: an optical element feeding device comprising a support member for supporting an optical element provided to correct spherical aberration so as to be capable of moving the optical element in an optical axis direction, a force applying member for applying force to the support member in the optical axis direction, a reference position detection part for detecting a reference position of the optical element, a stepping motor supplied with a definite voltage and driven, a motive force transmission member for converting rotation of the stepping motor into the optical axis direction and transmitting the converted rotation to the optical element; a driving circuit for driving the stepping motor; a decision circuit for judging operation to be abnormal when there is no change in an output of the reference position detection part even if the driving circuit outputs a driving signal to the stepping motor after the reference position detection part has detected the reference position of the optical element; and a changeover circuit for changing over a driving frequency so as to drive the stepping motor with a driving frequency lowered than a frequency in ordinary operation, on the basis of an operation abnormality signal output from the decision circuit.