Position indicating system
Patent 4039825 Issued on August 2, 1977. Estimated Expiration Date: 
August 2, 1994. 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 2, 1994. 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 3435246 3816000 3894230 3907435 InventorAssigneeApplicationNo. 639777 filed on 12/11/1975US Classes:356/622, Position of detected arrangement relative to projected beam250/206, Photocell controlled circuit250/208.2, Plural photosensitive nonimage detecting elements340/600, Radiant energy356/141.3, With unidirectional or planar source beam directed at the photodetecting station356/141.5, With at least 2-dimensional sensitivity356/400With light detector (e.g., photocell)ExaminersPrimary: Smith, Alfred E.Assistant: Moore, David K. Attorney, Agent or FirmInternational ClassesG01J 001/20H01J 039/12 Foreign Application Priority Data1974-12-16 UKAbstractThe invention concerns apparatus for indicating the position of a light beam relative to a target, comprising an optical system, as many linear arrays of photoelectric elements as the number of coordinates in which the position indication is sought, and an electronic circuit arrangement for processing the video output signals of the arrays, wherein the optical system forms a virtual source of the beam and special lenses form a narrow, band-like image of the virtual source on each array, and the circuit arrangement uses an integration technique for detecting the center of the distribution of the video output signals. | |
