发明授权
US08179768B2 Optical system for compensating for spherical aberration and/or coma aberration in an optical pickup device and optical pickup device having the same
有权
用于补偿光学拾取装置中的球面像差和/或彗形像差的光学系统和具有该光学系统的光学拾取装置
- 专利标题： Optical system for compensating for spherical aberration and/or coma aberration in an optical pickup device and optical pickup device having the same
- 专利标题（中）： 用于补偿光学拾取装置中的球面像差和/或彗形像差的光学系统和具有该光学系统的光学拾取装置
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申请号： US12679041申请日： 2008-09-19
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公开(公告)号： US08179768B2公开(公告)日： 2012-05-15
- 发明人: Yasuhiro Tanaka , Michihiro Yamagata , Katsuhiko Hayashi , Masahiro Birukawa
- 申请人： Yasuhiro Tanaka , Michihiro Yamagata , Katsuhiko Hayashi , Masahiro Birukawa
- 申请人地址： JP Osaka
- 专利权人： Panasonic Corporation
- 当前专利权人： Panasonic Corporation
- 当前专利权人地址： JP Osaka
- 代理机构： Renner, Otto, Boisselle & Sklar, LLP
- 优先权： JP2007-243733 20070920; JP2007-327549 20071219
- 国际申请： PCT/JP2008/002590 WO 20080919
- 国际公布： WO2009/037850 WO 20090326
- 主分类号： G11B7/00
- IPC分类号： G11B7/00
摘要：
An optical system for optical pickup, which optical system is used for performing recording, reproducing, and/or erasing of information on an optical recording medium and has a simple configuration, is provided. An optical pickup device 1 includes a collimator lens system 23, a beam expander 33, and an objective lens system 34 that includes an S-SIL element 27b. The beam expander 33 includes three lens elements 33a to 33c. By moving in an optical axis direction, the two lens elements 33a and 33b included in the beam expander 33 adjust a focal point of a spot formed within an optical recording medium 28, and compensate a spherical aberration caused by the difference in depth between recording layers.
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