Optical recording/reproducing apparatus, focusing method therefor, and optical disk recording medium

Abstract

A method and apparatus for realizing a stable focus jump operation even in a case where a waveform of an S-curve of a focus error signal fluctuates due to aberration due to fluctuation of a multilayer optical disk substrate thickness or the level of the S-curve fluctuates due to reflectance fluctuation are provided. A focus jump processing means (DSP) for performing a focus jump operation moving a laser spot among recording layers of a multilayer optical diskhaving a plurality of recording layers corresponding to a record/reproduce operation for recording data on the multilayer optical diskor reproducing data recorded on the multilayer optical diskperforms acceleration processing for moving the objective lens mounted on an optical pick-up from a certain recording layer of the multilayer optical disk to another recording layer, waiting processing, and deceleration processing for stopping the objective lensand makes an impulse of the acceleration pulse added for the movement of the objective lensin the acceleration processing larger than the deceleration pulse impulse stopping the objective lens