发明名称 |
Diffraction optical element, optical system and optical device |
摘要 |
A diffraction optical element comprises a substrate, a diffraction grating formed on the substrate with a material with low ultraviolet resistance and an ultraviolet screening means arranged on the substrate at a position closer to the incident light receiving side of the optical element relative to the diffraction grating. The ultraviolet screening means comprises a dielectric multilayer film and is formed on the other side of the substrate than the side carrying the diffraction grating. Alternatively, the ultraviolet screening means may be provided as a separate member from a diffraction optical element and arranged at a position closer to the incident light receiving side of the diffraction optical element in an optical system.
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申请公布号 |
US6522464(B2) |
申请公布日期 |
2003.02.18 |
申请号 |
US20010805143 |
申请日期 |
2001.03.14 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
KUWABARA TETSUO;NAKABAYASHI MASAAKI |
分类号 |
G02B1/11;G02B5/18;(IPC1-7):G02F1/03 |
主分类号 |
G02B1/11 |
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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