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US Patent 4214826 - Method and device for controlling the exposure of a camera when photographing an object of which luminance is different on each surface section thereof
US Patent Issued on July 29, 1980
Estimated Patent Expiration Date:
May 4, 1998Estimated 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.
Estimated Patent Expiration Date:
May 4, 1998Estimated 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.AbstractA 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. | 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 FirmUS Patent References3717077, 3741088, 3772517, 3945732, Light-measuring systemsIssued on: 03/23/1976 Inventor: Nobusawa3971046, Systems for responding to non-uniform scene brightness Issued on: 07/20/1976 Inventor: Nobusawa3994595Systems for statically determining brightness characteristics of an area to be photographed Issued on: 11/30/1976 Inventor: Nobusawa International ClassG03B 7/08 (20060101)Foreign Application Priority Data1975-07-21 JP |
