发明授权
US07969850B2 Optical element, optical pickup device comprising the same, and unnecessary light elimination method
有权
光学元件，包括该元件的光学拾取装置和不必要的光消除方法
- 专利标题： Optical element, optical pickup device comprising the same, and unnecessary light elimination method
- 专利标题（中）： 光学元件，包括该元件的光学拾取装置和不必要的光消除方法
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申请号： US11415595申请日： 2006-05-02
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公开(公告)号： US07969850B2公开(公告)日： 2011-06-28
- 发明人: Yasukazu Hamano
- 申请人： Yasukazu Hamano
- 申请人地址： JP Saitama
- 专利权人： Enplas Corporation
- 当前专利权人： Enplas Corporation
- 当前专利权人地址： JP Saitama
- 代理机构： DLA Piper LLP (US)
- 优先权： JP2005-139976 20050512
- 主分类号： G11B7/00
- IPC分类号： G11B7/00
摘要：
The optical element comprises a first diffraction structure for generating three beams by diffracting light from a light source and a second diffraction structure that exhibits structural birefringence for a prescribed polarized light returning to the light source. The first diffraction structure is formed on a first face of a translucent optical base material and the second diffraction structure is formed on a second face of the optical base material. The optical base material, the first diffraction structure and the second diffraction structure are formed of a single material.
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