发明名称 |
Diffractive optical element that polarizes light and an optical pickup using the same |
摘要 |
A first diffractive optical element pattern with a pattern pitch that is no greater than a wavelength of incident light is formed on a first main surface of substrate such as a glass plate. Second diffractive optical element patterns are formed at positions that are respectively incident to positive first-order diffracted light and negative first-order diffracted light produced by the first diffractive optical element pattern. Negative first-order diffracted light produced by each second diffractive optical element pattern is incident upon a boundary face of the substrate at an angle that is smaller than the critical angle, and so exits the substrate.
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申请公布号 |
US6947213(B2) |
申请公布日期 |
2005.09.20 |
申请号 |
US20040774960 |
申请日期 |
2004.02.09 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
NAKANISHI HIDEYUKI;TAKASUKA SHOICHI;IJIMA SHINICHI;YOSHIKAWA AKIO;SHIONO TERUHIRO |
分类号 |
G02B5/18;G02B5/30;G11B7/12;G11B7/135;G11B11/105;(IPC1-7):G02B5/30 |
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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