{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9784898","patent":{"patent_number":"US-9784898","title":"Phase difference compensating element and projection-type image projecting device","assignee":null,"inventors":[],"filing_date":"2014-04-09T00:00:00.000Z","publication_date":"2017-10-10T00:00:00.000Z","cpc_codes":["G02F","G02F","H04N","G02F","G02F"],"num_claims":12,"abstract":"A phase difference compensating element that can effectively compensate polarization disturbance, and a projection-type image projecting device are provided. The phase difference compensating element includes: a birefringent layer formed with a film stack of obliquely-deposited films, each of the obliquely-deposited films having a thickness equal to or smaller than the used wavelength; and an Rd-AR film that is formed with a film stack of two or more kinds of dielectric films having different refractive indexes, and provides an arbitrary phase difference to a phase difference in obliquely-incident transmitted light in the birefringent layer. The phase difference Rd to be provided by the Rd-AR film satisfies 1<Rd(λ)/Rd(λ′)<1.5 (λ<λ′), at an arbitrary wavelength λ in the used wavelength band and within an incident light angle range of 0 to 25 degrees."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Phase difference compensating element and projection-type image projecting device","description":"A phase difference compensating element that can effectively compensate polarization disturbance, and a projection-type image projecting device are provided. The phase difference compensating element ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9784898","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-9784898","citation_suggestion":"Patentable. \"Phase difference compensating element and projection-type image projecting device\" (US-9784898). https://patentable.app/patents/US-9784898","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9784898","json":"https://patentable.app/api/llm-context/US-9784898","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T05:59:36.296Z"}