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 Issued on July 29, 1980. Estimated Expiration Date: 
May 4, 1998. 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, 1998. 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 3717077 3741088 3772517 Light-measuring systems Systems for responding to non-uniform scene brightness Systems for statically determining brightness characteristics of an area to be photographed Patent #: 3994595 InventorsAssigneeApplicationNo. 05/906329 filed on 05/04/1978US Classes:396/234, More than two photometering areas356/222Plural detectorsExaminersPrimary: Hix, L. T.Assistant: Perkey, William B. Attorney, Agent or FirmInternational ClassG03B 7/08 (20060101)Foreign Application Priority Data1975-07-21 JPAbstractA method of controlling the exposure of a camera comprising steps of measuring the luminance of an object on each surface section thereof by a plurality of photoelectric elements widely arranged on the image forming plane of the camera and where the light from the object to be photographed is received, of gaining the maximum and the minimum values of the outputs provided by any one of the photoelectric elements and detecting whether the difference between the maximum and the minimum values exceeds a predetermined value, and of converting the mode for determining the exposure by the detecting signal.The exposure is determined on the basis of a luminance level equal to the maximum value when the difference between the maximum and the minimum values of the outputs provided by any one of the photoelectric elements exceeds the predetermined value and the number of the photoelectric elements providing outputs near the maximum value is small, while on the basis of a luminance level equal to the minimum value when the difference between the maximum and the minimum values of the outputs provided by any one of the photoelectric elements exceeds the predetermined value and the number of the photoelectric elements providing outputs near the minimum value is small. | |
