| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an objective lens expanding tolerance of inter-plane eccentricity and improving its yield, and to provide an optical pickup and an optical disk device using the same. <P>SOLUTION: The optical pickup device includes an objective lens 7 having a numerical aperture of 0.82 or more with both surfaces of the objective lens formed in aspheric shapes, and focusing an optical beam onto an optical recording medium, and records and/or reproduces an information signal for the optical recording medium by tilting an optical axis of the objective lens 7 to correct aberration due to the inter-plane eccentricity included in the both surfaces 7a, 7b of the objective lens, wherein astigmatism, spherical aberration, and higher-order coma aberration are each ≤20 mλrms when tilting the optical axis of the objective lens 7 so that third-order coma aberration generated due to the inter-plane eccentricity is substantially zero. <P>COPYRIGHT: (C)2008,JPO&INPIT |
