{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8472301","patent":{"patent_number":"US-8472301","title":"Objective optical element and optical pickup device","assignee":null,"inventors":[],"filing_date":"2012-11-21T00:00:00.000Z","publication_date":"2013-06-25T00:00:00.000Z","cpc_codes":["G11B","G11B","G11B","G11B","G11B"],"num_claims":10,"abstract":"Provided is an objective optical element which can appropriately correct degradation from spherical aberration upon fluctuation of a light source wavelength while maintaining light use efficiency, just by changing the magnification of the objective optical element, and which can record/reproduce information to/from different optical discs. Also provided is an optical pickup device using the objective optical element. When a light flux having two different wavelengths λ11, λ12 (wherein λ11<λ12 and λ12−λ11=5 nm) within a range of wavelength λ1 is introduced to the objective optical element to measure the wavefront aberration, the following third order and fifth order spherical aberrations in unit of λrms are obtained: SA3(λ11), SA5(λ11), SA3(λ12), SA5(λ12). If ΔSA3=|SA3(λ12)−SA3(λ11)|, ΔSA5=|SA5(λ12)−SA5(λ11)|, the following expression is satisfied 0.18>ΔSA3>ΔSA5>0 (1)."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Objective optical element and optical pickup device","description":"Provided is an objective optical element which can appropriately correct degradation from spherical aberration upon fluctuation of a light source wavelength while maintaining light use efficiency, jus","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8472301","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-8472301","citation_suggestion":"Patentable. \"Objective optical element and optical pickup device\" (US-8472301). https://patentable.app/patents/US-8472301","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8472301","json":"https://patentable.app/api/llm-context/US-8472301","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T04:10:53.071Z"}