{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9638901","patent":{"patent_number":"US-9638901","title":"Zoom lens and imaging device using the same","assignee":null,"inventors":[],"filing_date":"2015-01-27T00:00:00.000Z","publication_date":"2017-05-02T00:00:00.000Z","cpc_codes":["H04N"],"num_claims":20,"abstract":"A zoom lens includes, in the order starting from the object side to the side of an image plane, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power. The fourth lens group includes, in the order starting from the side closest to the image plane to the object side, a first positive lens, a first negative lens, a second negative lens and a second positive lens. The fourth lens group G4 has a configuration that satisfies the following conditional expression (1) when νdP1 represents an Abbe number of the first positive lens L46 and νdN1 represents an Abbe number of the first negative lens L45: −40<νdP1−νdN1<0  (1)."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Zoom lens and imaging device using the same","description":"A zoom lens includes, in the order starting from the object side to the side of an image plane, a first lens group having positive refractive power, a second lens group having negative refractive powe","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9638901","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-9638901","citation_suggestion":"Patentable. \"Zoom lens and imaging device using the same\" (US-9638901). https://patentable.app/patents/US-9638901","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9638901","json":"https://patentable.app/api/llm-context/US-9638901","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T16:30:33.419Z"}