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US 8,573,790 B2Granted
Light absorbing optical element having micro-relief structure
AssigneeNikon Corporation
InventorsYutaka Hamamura, Kiyoshi Kadomatsu, Yasutoshi Takada, Yoshiro Tani
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Abstract
An optical element that includes a substrate having two surfaces, each of the surfaces having a micro-relief structure that includes numerous fine protrusions, and a film that includes one or more layers including a metal layer and that is formed on one of the micro-relief structures.
Claims10
A light absorbing optical element, comprising:
- a substrate having an absorption coefficient of 1×101/cm or more in a wavelength range from 400 nm to 800 nm, the substrate having an entrance face and a back face, each of the entrance face and the back face having a micro-relief structure that includes numerous fine protrusions;
- and
- a film that includes one or more layers including a metal layer and is formed on the micro-relief structure of the back face,
- wherein when a light enters into and passes through the substrate, the light exits from the micro-relief structure of the back face and then enters into the one or more layers including the metal layer and is absorbed by the metal layer.
1 more element
Dependencies are inferred from the claim text.