发明名称 |
Diffraction grating, method of fabricating diffraction optical element, optical pickup device, and optical disk drive |
摘要 |
A diffraction grating with periodically arranged protrusions and grooves at a relatively narrow pitch and improved diffraction efficiency is disclosed. The protrusions of the grating are made of a material whose index of refraction is greater than that of the grooves, and the ratio of the width D of the protrusion to the pitch Lambda of the protrusion is set equal to or less than 0.4 (D/Lambda<=0.4).
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申请公布号 |
US2007002447(A1) |
申请公布日期 |
2007.01.04 |
申请号 |
US20060500391 |
申请日期 |
2006.08.08 |
申请人 |
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发明人 |
KAWASAKI TOSHIYUKI;OOHCHIDA SHIGERU;SUZUDO TSUYOSHI;MORI KOJI |
分类号 |
G02B5/18 |
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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