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US 11,443,547 B2Granted
Waveguide device incorporating beam direction selective light absorber
AssigneeDigiLens Inc.
InventorsMilan Momcilo Popovich, Jonathan David Waldern
Life of this patent
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Abstract
A contact image sensor having an illumination source; a first SBG array device; a transmission grating; a second SBG array device; a waveguiding layer including a multiplicity of waveguide cores separated by cladding material; an upper clad layer; and a platen. The sensor further includes: an input element for coupling light from the illumination source into the first SBG array; a coupling element for coupling light out of the cores into output optical paths coupled to a detector having at least one photosensitive element.
Claims18
A waveguide device comprising:
- a source of light;
- a waveguide having a first total internal reflection (TIR) surface and a second TIR surface facing the outside world;
- an input coupler for coupling the light into a TIR path in the waveguide;
- a grating for extracting light from the waveguide via the first TIR surface;
- and
- a light absorbing material disposed in at least one region of the waveguide, wherein the light absorbing material provides directional selectivity to the TIR light.
3 more elements
Dependencies are inferred from the claim text.