{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-11256155","patent":{"patent_number":"US-11256155","title":"Contact image sensor using switchable Bragg gratings","assignee":null,"inventors":[],"filing_date":"2019-10-25T00:00:00.000Z","publication_date":"2022-02-22T00:00:00.000Z","cpc_codes":["G02F","G02F","G06F","G06V","G02F","G02F","H01L"],"num_claims":20,"abstract":"A contact image sensor comprises: a light source providing a collimated beam; a detector and a switchable grating array comprising first and second transparent substrates sandwiching an array of switchable grating elements with transparent electrodes applied to said substrates, said substrates together providing a total internal reflection light guide. A first transmission grating layer overlays said first substrate. A second transmission grating layer overlays said second substrate. A quarter wavelength retarder layer overlays said second transmission grating layer. A platen overlays said quarter wavelength retarder layer; a polarization-rotating reflecting layer overlaying said first transmission grating layer. An input coupler for directing light from said light source into said light guide and an output coupler for extracting light out of said light guide towards said detector are also provided."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Contact image sensor using switchable Bragg gratings","description":"A contact image sensor comprises: a light source providing a collimated beam; a detector and a switchable grating array comprising first and second transparent substrates sandwiching an array of switc","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-11256155","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-11256155","citation_suggestion":"Patentable. \"Contact image sensor using switchable Bragg gratings\" (US-11256155). https://patentable.app/patents/US-11256155","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-11256155","json":"https://patentable.app/api/llm-context/US-11256155","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T20:06:29.763Z"}