- 专利标题: Optical pickup lens device and information recording and reproducing device using the same
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申请号: US11385829申请日: 2006-03-22
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公开(公告)号: US07221521B2公开(公告)日: 2007-05-22
- 发明人: Katsuhiko Hayashi , Yasuhiro Tanaka , Michihiro Yamagata , Yoshiaki Komma , Fumitomo Yamasaki
- 申请人: Katsuhiko Hayashi , Yasuhiro Tanaka , Michihiro Yamagata , Yoshiaki Komma , Fumitomo Yamasaki
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: McDermott Will & Emery LLP
- 优先权: JP2003-195582 20030711; JP2004-137594 20040506
- 主分类号: G02B13/18
- IPC分类号: G02B13/18 ; G02B3/02 ; G11B7/00 ; G11B7/135
摘要:
An optical pickup lens device includes, in the order from the light source side, a collimating lens for converting a bundle of rays into parallel rays or predetermined convergent or divergent rays, the collimating lens being movably held along a direction of an optical axis of a bundle of rays emitted from a light source; an aberration correcting element for allowing a bundle of rays emitted from the collimating lens to be transmitted therethrough; and an objective lens element having a numerical aperture of 0.8 or more, and converging a bundle of rays coming from the aberration correcting element onto the information recording medium to form a spot. The aberration correcting element and the objective lens element are integrally held together in a direction orthogonal to the optical axis so as to perform tracking on the information recording medium, and satisfy predetermined conditions.
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