Method and apparatus for contact image sensing
First Claim
Patent Images
1. A light sensor incorporating a waveguide device comprising:
- a detector;
a first coupler configured to direct light reflected off an object into a waveguide device;
a second coupler configured to direct light propagating within said waveguide device onto the detector;
an optical substrate with first and second light reflecting surfaces; and
plurality of light absorbing regions on at least one of said surfaces, each light absorbing region bordering at least one non-absorbing region;
wherein each said non-absorbing region of said first surface overlaps with a non-absorbing region of said second surface forming a plurality of waveguiding channels within a waveguiding volume within said substrate such that each waveguiding channel is capable of propagating a light beam without crossing over into an adjacent waveguiding channel.
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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.
818 Citations
21 Claims
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1. A light sensor incorporating a waveguide device comprising:
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a detector; a first coupler configured to direct light reflected off an object into a waveguide device; a second coupler configured to direct light propagating within said waveguide device onto the detector; an optical substrate with first and second light reflecting surfaces; and plurality of light absorbing regions on at least one of said surfaces, each light absorbing region bordering at least one non-absorbing region; wherein each said non-absorbing region of said first surface overlaps with a non-absorbing region of said second surface forming a plurality of waveguiding channels within a waveguiding volume within said substrate such that each waveguiding channel is capable of propagating a light beam without crossing over into an adjacent waveguiding channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification