| 摘要 |
<p>An optical pickup apparatus for conducting recording and/or reproducing information of an optical information recording medium, comprises a light source (11); a converging optical system having an objective lens (3); and a photo-detector. The converging optical system comprises a plastic lens (3) and a spherical aberration deviation correcting element (4,5) to correct deviation of a spherical aberration of the converging optical system. A numerical aperture of the objective lens at an image-side is 0.65 or more. <IMAGE></p> |
