Optical information recording apparatus

A rewritable optical disk apparatus, optical information recording and reproducing apparatus or the like is allowed to automatically and properly adjust the optical system to the optimum focal condition regardless of the readout signal detector's positional error and the residual aberration in...

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Bibliographic Details
Main Authors Isshiki, Fumio, Ohnishi, Kunikazu, Maeda, Nobuyuki, Kurokawa, Takahiro, Shimano, Takeshi
Format Patent
LanguageEnglish
Published 20.01.2009
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Summary:A rewritable optical disk apparatus, optical information recording and reproducing apparatus or the like is allowed to automatically and properly adjust the optical system to the optimum focal condition regardless of the readout signal detector's positional error and the residual aberration in the optical system. The spherical aberration and defocus are coarsely adjusted using the amplitude (PP amplitude) of the tracking error signal and then finely adjusted using the amplitude (RF amplitude) of the readout signal. Since the spherical aberration can properly be adjusted, it is possible to raise the reliability of the readout signal.