Optical pickup device
Patent 6937381 Issued on August 30, 2005. Estimated Expiration Date: 
August 13, 2022. 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.
August 13, 2022. 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 pickup with aberration correcting panel including a liquid crystal Optical recording and reproducing apparatus and method Patent #: 6084843 InventorsApplicationNo. 10483859 filed on 08/13/2002US Classes:359/279, Phase modulation369/112.01, Having particular optical element or particular placement thereof in radiation beam path to or from storage medium369/112.02, Crystal (e.g., liquid, elasto-optic, photo-refractive, etc.)369/112.23, Particular lens369/112.07Plural diffractive sectionsExaminersPrimary: Spector, David N.Attorney, Agent or FirmForeign Patent References
International ClassesG02F001/10G11B007/00 G11B007/135 G02B013/00 G11B007/125 G11B007/135 G11B007/135 G11B007/135 G02F001/13 AbstractAn optical pickup device which includes (A) a light source, and (B) an objective lens and an aberration correcting optical system which are located in a light path from the light source to an optical recording medium is so arranged that the aberration correcting optical system imparts a phase distribution to luminous flux which transmits the aberration correcting optical system, so as to correct a predetermined aberration; and an amount of phase of the aberration correcting optical system when correcting the aberration is set in such a manner that the aberration correcting optical system imparts a larger amount of phase at a position farther from a point where the aberration correcting optical system crosses an optical axis of light emitted from the light source. With this, it is possible to increase a tolerance for the center misalignment of the objective lens so as to reduce aberration caused by the center misalignment.Other References
Field of SearchPhase modulationObjective for laser (e.g., optical disc, etc.) Annular zonal correcting Optical feedback Having 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 Rate, phase, or transient processing | |
