发明名称 |
Reflecting wavelength plate and optical pickup using reflecting wavelength plate |
摘要 |
Disclosed is a reflecting wavelength plate that deflects and reflects a light path and adds a phase difference with respect to plural incident light having different wavelengths. The reflecting wavelength plate includes a substrate; a reflecting film laminated on the substrate; and a sub-wavelength concavo-convex structure that is laminated on the reflecting film and has a pitch less than or equal to the shortest wavelength of the plural incident light. The filling factor and the groove depth of the sub-wavelength concavo-convex structure are determined so as to add the phase difference obtained by (k&pgr;)/8, where k is an integer, to the plural incident light having the different wavelengths. |
申请公布号 |
US8154976(B2) |
申请公布日期 |
2012.04.10 |
申请号 |
US20090550997 |
申请日期 |
2009.08.31 |
申请人 |
HIRAI HIDEAKI;UMEKI KAZUHIRO;NASUKAWA TOSHIMICHI;RICOH COMPANY, LTD. |
发明人 |
HIRAI HIDEAKI;UMEKI KAZUHIRO;NASUKAWA TOSHIMICHI |
分类号 |
G11B7/00 |
主分类号 |
G11B7/00 |
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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