- 专利标题： Optical element, aberration correcting element, light converging element, objective optical system, optical pickup device, and optical information recording reproducing device
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申请号： US12071740申请日： 2008-02-26
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公开(公告)号： US20080170487A1公开(公告)日： 2008-07-17
- 发明人: Tohru Kimura , Kiyoshi Yamashita , Nobuyoshi Mori , Yuichi Atarashi
- 申请人： Tohru Kimura , Kiyoshi Yamashita , Nobuyoshi Mori , Yuichi Atarashi
- 专利权人： Konica Minolta Opto, Inc.
- 当前专利权人： Konica Minolta Opto, Inc.
- 优先权： JPJP2003-173911 20030618; JPJP2003-296556 20030820; JPJP2003-318483 20030910; JPJP2003-385393 20031114; JPJP2003-435248 20031226; JPJP2004-110368 20040402
- 主分类号： G11B7/00
- IPC分类号： G11B7/00
摘要：
An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped zone is composed of a plurality of stepped sections stepwise, and a second optical surface having a diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each of the plurality of ring-shaped zones are divided by a stepped section to generate a diffractive light ray of diffractive order whose absolute value is not small than 1 for the light flux.
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