Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1983-12-19
1987-03-17
Adams, Russell E.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356222, G03B 708
Patent
active
RE0323764
ABSTRACT:
An 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.
REFERENCES:
patent: 3994595 (1976-11-01), Nobusawa
patent: 4182573 (1980-01-01), Yamada et al.
patent: 4214826 (1980-07-01), Uchida et al.
patent: 4285583 (1981-08-01), Canter
patent: 4285584 (1981-08-01), Canter
Fukuhara Toru
Higashi Koichi
Saegusa Takashi
Adams Russell E.
Nippon Kogaku K.K.
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