发明名称 Optical head, recording and/or reproducing method and apparatus and method for detecting thickness
摘要 An optical head used for recording/reproducing information signals for an optical disc having a light transmitting layer on a recording layer includes an actuator for the collimator lens. A collimator lens arranged between a light source and an objective lens is moved by the actuator for the collimator lens in a direction of cancelling the spherical aberration ascribable to thickness errors in the light transmitting layer. By this structure, the amount of generation of spherical aberration is reduced even if the numerical aperture NA of the objective lens loaded on the optical head is increased to render it possible to increase the recording capacity of the optical disc.
申请公布号 US6418108(B1) 申请公布日期 2002.07.09
申请号 US19990226131 申请日期 1999.01.07
申请人 SONY CORPORATION 发明人 UEDA MITSUNORI;KUBO TAKESHI;SUZUKI JUNICHI;SAKAMOTO SATOSHI;KAWAMURA HIROSHI;HINENO SATOSHI
分类号 G11B7/125;G11B7/135;G11B11/105;(IPC1-7):G11B7/00 主分类号 G11B7/125
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