Objective lens and optical pickup device
Patent 7151736 Issued on December 19, 2006. Estimated Expiration Date: 
September 5, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 5, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOptical disk pickup device with focusing correction by electrostriction Patent #: 5513158 InventorsAssigneeApplicationNo. 10655349 filed on 09/05/2003US Classes:369/112.23, Particular lens369/44.12, Solid state optical element with plural dissimilar optical components (e.g., using I.C. block, etc.)369/44.23, Structure for shaping beam or causing astigmatic condition369/53.22By detection of storage medium incident radiationExaminersPrimary: Hindi, NabilAttorney, Agent or FirmForeign Patent References
International ClassG11B 7/00AbstractAn objective lens for converging light onto an information recording medium includes a refracting interface for converging an incident light into a convergent light, and a refractive index varying member disposed between the refracting interface and the information recording medium, and having a refractive index that is varied according to an externally applied voltage.Field of SearchHolographicHaving particular optical element or particular placement thereof in radiation beam path to or from storage medium Crystal (e.g., liquid, elasto-optic, photo-refractive, etc.) Particular lens Structure for shaping beam or causing astigmatic condition Means to mask or shield a portion of the beam Solid state optical element with plural dissimilar optical components (e.g., using I.C. block, etc.) | |
