发明名称 |
Diffractive optical element, and optical system and optical apparatus provided with the same |
摘要 |
A diffractive optical element of the blazed-binary grating type is disclosed, with which a high diffraction efficiency can be achieved over substantially the entire used wavelength region. The diffractive optical element has a periodic structure taking a grating unit including a plurality of grating portions with different grating width and grating interval as one period. The diffraction element further includes a plurality of first grating portions made of a first material and a plurality of second grating portions made of a second material having a different refractive index than the first material that are arranged between the first grating portion.
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申请公布号 |
US6927915(B2) |
申请公布日期 |
2005.08.09 |
申请号 |
US20030459902 |
申请日期 |
2003.06.12 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
NAKAI TAKEHIKO |
分类号 |
G02B5/18;(IPC1-7):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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