发明名称 |
Optical element, aberration correcting element, light converging element, objective optical system, optical pickup device, and optical information recording reproducing device |
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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申请公布号 |
US2008170487(A1) |
申请公布日期 |
2008.07.17 |
申请号 |
US20080071740 |
申请日期 |
2008.02.26 |
申请人 |
KONICA MINOLTA OPTO, INC. |
发明人 |
KIMURA TOHRU;YAMASHITA KIYOSHI;MORI NOBUYOSHI;ATARASHI YUICHI |
分类号 |
G02B5/18;G11B7/00;G02B13/00;G02B13/16;G02B13/18;G11B7/125;G11B7/135 |
主分类号 |
G02B5/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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