Patent ID: 6756574
Filing Date: 2004-06-29
Classification: G02B,G11B

Abstract:
A focusing control apparatus for an optical pickup which includes an objective lens for focusing a light beam on a recording layer of a multi-layer recording medium having a plurality of recording layers, an aberration correcting unit for correcting aberration of a reflected light beam from the recording layer, and a photodetector for receiving the reflected light beam, said focusing control apparatus comprising:a focus error detector which detects an amount of focus error of the light beam from a detection signal of said photodetector to generate a focus error value; an aberration detector which detects an amount of aberration of the reflected light beam from a detection signal of said photodetector to generate an aberration value; and a controller which controls a focused position of said objective lens on the basis of said focus error value while adjusting an amount of aberration correction of said aberration correction unit on the basis of said aberration value, wherein said controller performs a focus jump from one recording layer to another recording layer after adjusting the amount of aberration correction of said aberration correcting unit for said another recording layer.