Dispersive element, diffraction grating, color display...

Details Dispersive element, diffraction grating, color display... Dispersive element, diffraction grating, color display...

2007-12-26

2010-10-05

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S576000, C359S567000

Reexamination Certificate

active

07808704

ABSTRACT:
In a transmission grating as a dispersive element, diffraction efficiency is enhanced and manufacturing costs are considerably reduced. A dispersive element includes resin members for forming a diffraction grating, being composed of a plurality of diffraction grating members having a cross-sectional shape respectively surrounded by two straight lines such as a triangular shape, and metal members as light-shielding members each being formed on corresponding one of the diffraction grating members at one side of the diffraction grating member along any of the straight line and the curved line of the cross-sectional shape of the diffraction grating member formed by the resin member. The metal members are configured to reduce zero-order transmitted light with respect to incident light, and to enhance diffraction efficiency of first-order transmitted light.

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