an optical disk drive having a laser source for irradiating an optical beam onto an optical disk , a lens unit to focus the optical beam from the laser source onto the optical disk , a drive unit for driving the lens unit , and a high - frequency signal output unit for producing a high - frequency signal . the drive unit drives the lens unit by applying the high - frequency signal before the optical disk is started to reproduce , and drives it without applying the high - frequency signal after the optical disk is started to reproduce . thus , it is possible to effectively control the aberration correction mechanism using a linear actuator .