Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2005-09-20
2005-09-20
Robinson, Mark A. (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S576000
Reexamination Certificate
active
06947214
ABSTRACT:
A diffractive optical element in which eclipse of rays at a grating side surface of a diffraction grating can be reduced is disclosed. In a diffractive optical element comprises a plurality of diffraction gratings made of different materials are laminated, at least one of the plurality of diffraction gratings includes a region in which the grating side surface inclines or a region in which edges thereof are shifted with respect to the edge of another diffraction grating adjacent thereto. The inclination or shift amount is different according to the positions thereof in a surface of the diffractive optical element in accordance with the incident angle or emergent angle of a specified ray such as a ray determined on the basis of an average value, gravity value, maximum value and minimum value obtained from the distribution of incident angle or emergent angle or the like, rays, etc.
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Amari Alessandro
Morgan & Finnegan L.L.P.
Robinson Mark A.
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