Patent ID: 6567357
Filing Date: 2003-05-20
Classification: G11B

Abstract:
An optical disk apparatus, comprising:a moving part for moving a converged point of a light beam converged on a recording medium having a plurality of stacked recording/reproducing surfaces in a direction substantially vertical to the recording/reproducing surfaces; a converged state detecting part for generating a signal corresponding to a converged state of the light beam on the recording medium; a focus control part for driving the moving part in accordance with a focus error signal that is an output signal from the converged state detecting part, in such a manner that the light beam is converged at a substantially constant position on the recording medium; a focus jumping part for moving the converged point of the light beam from an arbitrary recording/reproducing surface of the recording medium to another recording/reproducing surface thereof; a surface deflection measuring part for measuring a shape of surface deflection of the recording medium; and a jumping starting part for operating the focus jumping part based on measurement results of the surface deflection measuring part.