Exposure control apparatus for camera provided with multi metering device
Patent 4306787 Issued on December 22, 1981. Estimated Expiration Date: 
November 18, 2000. 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.
November 18, 2000. 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 ReferencesSystems for statically determining brightness characteristics of an area to be photographed Exposure meter Method and device for controlling the exposure of a camera when photographing an object of which luminance is different on each surface section thereof Patent #: 4214826 InventorsAssigneeApplicationNo. 06/208039 filed on 11/18/1980US Classes:396/234, More than two photometering areas356/222Plural detectorsExaminersPrimary: Adams, Russell E.Attorney, Agent or FirmInternational ClassesG03B 7/091 (20060101)G03B 7/099 (20060101) G03B 7/093 (20060101) Foreign Application Priority Data1979-11-22 JPAbstractAn improved exposure control apparatus for camera comprises a metering circuit, exposure operational circuit, correction value calculating circuit and correction operational circuit. The metering circuit meters a plural number of divisional sections of the field of an object and generates a plural number of photoelectric outputs corresponding to the respective sections of the field. The exposure operational circuit calculates an exposure value from the plural number of photoelectric outputs. The correction value calculating circuit calculates correction values for correcting the distribution characteristics of said photometric outputs relative to the distribution characteristics of illumination on the focal plane of the photographing lens of the camera at the time of photographing, the correction values corresponding to the sections of the field respectively. The correction operational circuit makes a correction to the respective photoelectric outputs in accordance with the respective correction values found by above calculation. | |
