Focusing more than 30 depths from an aplanatic point of a plano-convex lens
May 11, 2018. 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 recording system employing a solid immersion lens Optical disk data storage system with radiation-transparent air-bearing slider Chromatic focal pencil beam-generating apparatus Microscope with a condenser lens system having a tapered portion Optical flying head with solid immersion lens having raised central surface facing medium optical pickup apparatus Flying head with solid immersion lens partially mounted on a slider Patent #: 5881042 InventorApplicationNo. 075677 filed on 05/11/1998US Classes:369/112.24, Plural distinct lenses359/664, Spherical369/44.23Structure for shaping beam or causing astigmatic conditionExaminersPrimary: Dinh, TanAssistant: Chu, Kim-Kwok Attorney, Agent or FirmForeign Patent References
International ClassG11B 007/00Foreign Application Priority Data1997-05-23 EPAbstractA device for optically scanning a record carrier with radiation beam having a high numerical aperture. The radiation beam is focused on the record carrier by an objective lens and a plano-convex lens. The plano-convex lens has a gap with the record carrier of several tens of micorometers. It focuses the radiation beam to a point at least 30 focal depths away from an aplanatic point of the plano-convex lens. As a consequence, the lens has a relatively large tolerance for sideways movements.Field of SearchSPECIFIC DETAIL OF INFORMATION HANDLING PORTION OF SYSTEMOptical head servo system structure Structure for shaping beam or causing astigmatic condition With movement of optical beam (e.g., galvanometer) Elastic, flexible, pliant or spring support of lens or mirror Flat flexible support (e.g., parallel leaf spring, etc.) WITH SERVO POSITIONING OF TRANSDUCER ASSEMBLY OVER TRACK COMBINED WITH INFORMATION SIGNAL PROCESSING Lens mounts With lens casing With support With aberration correction Using a hologram as an optical element Lens Spherical Having less than four components Microscope objective | |
