Invention Grant
US09335557B2 Diffractive optical element having high diffraction efficiency at plural wavelengths and image-pickup optical system using the same
有权
在多个波长处具有高衍射效率的衍射光学元件和使用该衍射光学元件的摄像光学系统
- Patent Title: Diffractive optical element having high diffraction efficiency at plural wavelengths and image-pickup optical system using the same
- Patent Title (中): 在多个波长处具有高衍射效率的衍射光学元件和使用该衍射光学元件的摄像光学系统
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Application No.: US13213169Application Date: 2011-08-19
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Publication No.: US09335557B2Publication Date: 2016-05-10
- Inventor: Hidemi Takayama
- Applicant: Hidemi Takayama
- Applicant Address: JP Tokyo
- Assignee: CANON KABUSHIKI KAISHA
- Current Assignee: CANON KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Rossi, Kimms & McDowell LLP
- Priority: JP2010-191656 20100830
- Main IPC: G02B5/18
- IPC: G02B5/18 ; G02B13/02 ; G02B27/42 ; G02B27/00
Abstract:
A diffractive optical element in which the maximum optical path length of light is an integral multiple of each of a plurality of wavelengths includes a diffractive grating configured by combining a first member and a second member having a refractive index lower than a refractive index of the first member and having dispersion higher than a dispersion of the first member. At least one of the first member and the second member is made of a glass material, and the diffractive grating is formed by the glass material which is heated to be softened using a thermal press forming, and has a concave grating shape that has a grating height increasing from a central part toward a peripheral part.
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