{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9671597","patent":{"patent_number":"US-9671597","title":"Zoom lens unit, imaging device, and monitoring video camera","assignee":null,"inventors":[],"filing_date":"2015-03-04T00:00:00.000Z","publication_date":"2017-06-06T00:00:00.000Z","cpc_codes":["H04N","H04N"],"num_claims":12,"abstract":"A zoom lens unit includes, in order from an object side to an image side, a first lens group having positive refractive power and a focus function, a second lens group having negative refractive power, which moves when changing a magnification, a third lens group which moves when changing a magnification, and a fourth lens group having positive refractive power, which is fixed when changing a magnification, wherein the following condition (1) is fulfilled:|M2W·M3W·M4W|<0.14  (1)where M2W represents an imaging magnification of the second lens group at a wide-angle end, M3W represents an imaging magnification of the third lens group at the wide-angle end, and M4W represents an imaging magnification of the fourth lens group at the wide-angle end."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Zoom lens unit, imaging device, and monitoring video camera","description":"A zoom lens unit includes, in order from an object side to an image side, a first lens group having positive refractive power and a focus function, a second lens group having negative refractive power","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9671597","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-9671597","citation_suggestion":"Patentable. \"Zoom lens unit, imaging device, and monitoring video camera\" (US-9671597). https://patentable.app/patents/US-9671597","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9671597","json":"https://patentable.app/api/llm-context/US-9671597","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T05:00:03.166Z"}