Photodetector filter structure
First Claim
Patent Images
1. An optical filter structure for a photodetector comprising:
- a transparent dome in the shape of a segment of a spherical shell of uniform thickness, said dome positioned in front of the photodetector with a concave surface of the dome facing the photodetector so that light passing through the dome normal to the dome'"'"'s surface will intersect at the center of the photodetector;
an interference filter on the surface of the dome; and
an absorption filter between the dome and the photodetector.
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Abstract
A transparent dome formed from a segment of a spherical shell of uniform thickness has an optical filter on its surface. A photodetector is positioned on the concave side of the dome so that light rays passing through the dome, normal to its surface, will fall on the center of the photodetector.
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Citations
7 Claims
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1. An optical filter structure for a photodetector comprising:
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a transparent dome in the shape of a segment of a spherical shell of uniform thickness, said dome positioned in front of the photodetector with a concave surface of the dome facing the photodetector so that light passing through the dome normal to the dome'"'"'s surface will intersect at the center of the photodetector; an interference filter on the surface of the dome; and an absorption filter between the dome and the photodetector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification