{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8493569","patent":{"patent_number":"US-8493569","title":"Optical encoder readhead configuration with phosphor layer","assignee":null,"inventors":[],"filing_date":"2010-12-27T00:00:00.000Z","publication_date":"2013-07-23T00:00:00.000Z","cpc_codes":["G01D","G01D"],"num_claims":17,"abstract":"A device for measuring relative displacement between two members includes a scale grating and an optical encoder readhead comprising a first wavelength light source illuminating the grating. The grating outputs scale light to form a moving periodic intensity pattern at the first wavelength. The readhead comprises a plurality of spatial phase detectors comprising: a periodic spatial filter; a phosphor layer that receives light arising from the first wavelength periodic intensity pattern and outputs second wavelength light, and a photodetector element that receives, and is sensitive to, the second wavelength light. The photodetector element inputs second wavelength light corresponding to a spatially filtered version of the first wavelength periodic intensity pattern and outputs a signal indicative of its spatial phase relative to that spatial phase detector. The spatial filtering may be provided by a mask element, or by a pattern of the phosphor layer and/or the detector element, in various embodiments."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Optical encoder readhead configuration with phosphor layer","description":"A device for measuring relative displacement between two members includes a scale grating and an optical encoder readhead comprising a first wavelength light source illuminating the grating. The grati","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8493569","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-8493569","citation_suggestion":"Patentable. \"Optical encoder readhead configuration with phosphor layer\" (US-8493569). https://patentable.app/patents/US-8493569","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8493569","json":"https://patentable.app/api/llm-context/US-8493569","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T08:34:47.741Z"}