Alignment system and ophthalmic instrument incorporating the same
Patent 4180323 Issued on December 25, 1979. Estimated Expiration Date: 
September 30, 1997. 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 30, 1997. 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 References 881127 3871772 3904280 InventorsAssigneeApplicationNo. 05/838177 filed on 09/30/1977US Classes:356/3, RANGE OR REMOTE DISTANCE FINDING351/200, EYE EXAMINING OR TESTING INSTRUMENT351/208, Having means to detect proper distance or alignment (i.e., eye to instrument)356/153, Alignment of axes nominally coaxial356/399BY ALIGNMENT IN LATERAL DIRECTIONExaminersPrimary: Evans, F. L.Attorney, Agent or FirmInternational ClassA61B 3/15 (20060101)AbstractAn optical alignment system having a movable portion which contains a centering reticle and range finder, the movable portion is optically coupled to a stationary portion including a field lens to permit the precise positioning of a member relative to an object observed at the field lens. A zone parallel light and an image on the field lens permit adjustment of the member and movable portion without corresponding movement of the operator's head. The system is readily combined with an optometer to provide precision positioning of an optometer eyepiece relative to a patient's eye.Field of SearchRANGE OR REMOTE DISTANCE FINDINGLength of base line variable Stationary measuring marks Ortho-pseudo type External basis type Stereoscopic With view finder Image displaced by rotating reflecting element Object size or distance known Image displaced by moving refracting element Prism structure for determining coincidence Base line instrument (i.e., base is a part of instrument) With mounting, supporting, adjusting, or folding structure With displaced images With filter or light valve Range finder combined with height finder Alignment of axes nominally coaxial | |
