{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9753246","patent":{"patent_number":"US-9753246","title":"Eyepiece optical system, optical apparatus and method for manufacturing the eyepiece optical system","assignee":null,"inventors":[],"filing_date":"2015-04-01T00:00:00.000Z","publication_date":"2017-09-05T00:00:00.000Z","cpc_codes":["H04N","H04N"],"num_claims":19,"abstract":"Provided is an eyepiece optical system including, in order from an observation object (Ob): a first lens (L11) having positive refractive power; a second lens (L12) which has negative refractive power and of which an observation object (Ob) side lens surface is concave; and a third lens (L13) which has positive refractive power and of which an eye point (EP) side lens surface is convex. The third lens (L13) is fixed on the optical axis with respect to the observation object (Ob) when adjusting the diopter, and the following conditional expressions are satisfied:0.65<R31/fe<1.30  (1)−0.80<(R32+R31)/(R32−R31)<−0.10  (2)where fe denotes a focal length of the eyepiece optical system, R31 denotes a radius of curvature of the observation object (Ob) side lens surface of the third lens (L13), and R32 denotes a radius of curvature of the eye point (EP) side lens surface of the third lens (L13)."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Eyepiece optical system, optical apparatus and method for manufacturing the eyepiece optical system","description":"Provided is an eyepiece optical system including, in order from an observation object (Ob): a first lens (L11) having positive refractive power; a second lens (L12) which has negative refractive power","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9753246","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-9753246","citation_suggestion":"Patentable. \"Eyepiece optical system, optical apparatus and method for manufacturing the eyepiece optical system\" (US-9753246). https://patentable.app/patents/US-9753246","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9753246","json":"https://patentable.app/api/llm-context/US-9753246","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T07:59:16.704Z"}