Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1988-04-26
1989-08-29
Perkey, W. B.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354418, 354419, 354420, 354432, 356222, 356221, G03B 1505, G03B 708, G01J 142
Patent
active
048622060
ABSTRACT:
A contralight compensation exposure control system which determines as a contralight condition and fires a strobe when there is a difference between the output of a partial light measuring means for measuring the brightness of a portion of a scene to be photographed i.e. the brightness of the main object such as a person, and the output of an average light measuring means for measuring the brightness of comparatively large area of the scene i.e. the brightness of the subordinate object such as the background of the main object. The control circuit of the system inhibits the strobe firing and actuates an exposure compensation means to shift the controlled exposure to the overexposure side when a detecting means detect uncompletion of charging of the main capacitor for firing the strobe even if the contralight condition is detected.
REFERENCES:
patent: 4690536 (1987-09-01), Nakai et al.
patent: 4705382 (1907-11-01), Mukai et al.
patent: 4746947 (1988-05-01), Nakai
patent: 4748468 (1988-05-01), Fujino et al.
Hoda Takeo
Kobayashi Haruo
Matsushita Shuzo
Mukai Hiromu
Ootsuka Hiroshi
Minolta Camera Kabushiki Kaisha
Perkey W. B.
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