{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8483023","patent":{"patent_number":"US-8483023","title":"Optical head, diffraction device, objective lens, and optical disc apparatus","assignee":null,"inventors":[],"filing_date":"2011-06-06T00:00:00.000Z","publication_date":"2013-07-09T00:00:00.000Z","cpc_codes":["G11B","G11B","G11B","G11B"],"num_claims":8,"abstract":"An object of the present invention is to reduce the influence of a stray light incident on a light receiving device by reflection of an unnecessary diffraction light not contributing to write or read on a disc surface at write or read of an optical disc having a large surface reflectivity with respect to an information recording surface. A position in which a diffraction light with an n-order in an advancing path and the n-order in a returning path, reflected on the information recording surface of a first information recording medium, is focused by a condensing lens is different from a position in which a diffraction light different from the n-order diffraction light in at least one of the advancing path and the returning path, reflected on a surface of the first information recording medium, is focused by the condensing lens."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Optical head, diffraction device, objective lens, and optical disc apparatus","description":"An object of the present invention is to reduce the influence of a stray light incident on a light receiving device by reflection of an unnecessary diffraction light not contributing to write or read ","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8483023","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-8483023","citation_suggestion":"Patentable. \"Optical head, diffraction device, objective lens, and optical disc apparatus\" (US-8483023). https://patentable.app/patents/US-8483023","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8483023","json":"https://patentable.app/api/llm-context/US-8483023","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T18:14:16.091Z"}