Scene brightness measuring system
Patent 4395099 Issued on July 26, 1983. Estimated Expiration Date: 
May 4, 2001. 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.
May 4, 2001. 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 3772517 Automatic focus system with loss of correlation inhibit Data printing device for photographic camera Method and device for controlling the exposure of a camera when photographing an object of which luminance is different on each surface section thereof Exposure control apparatus for camera provided with multi metering device Patent #: 4306787 InventorApplicationNo. 06/260410 filed on 05/04/1981US Classes:396/50, ATTITUDE SENSING396/234More than two photometering areasExaminersPrimary: Gellner, Michael L.Attorney, Agent or FirmInternational ClassG03B 7/091 (20060101)Foreign Application Priority Data1980-05-02 JPAbstractA number of light receiving elements are used for measuring the brightness Bi of a number of parts of the scene and the maximum brightness Bmax and the minimum brightness Bmin are detected among the measured brightness values. Then, the scene brightness B is calculated by use of a formula: ##EQU1## Based on the scene brightness thus obtained, the aperture or shutter is controlled to obtain appropriate exposure. In case where the weighting coefficients for the number of light receiving elements are made equal to each other, the average brightness Bmean throughout the whole image is used. | |
