Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1994-05-13
1996-05-07
Perkey, W. B.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356215, 356222, G03B 708
Patent
active
055151329
ABSTRACT:
A photometric control device for a camera comprises a light-receiving device 7 for conducting a photometry on a subject field with an accumulation type of photoelectric conversion device to output a photometric signal corresponding to brightness of the subject field, an accumulation time setting unit 13 for controlling an accumulation time of the photoelectric conversion device, a selection unit 14 for selecting any one of a first brightness value calculation mode for suppressing affection of flicker of a light source and a second brightness value calculation mode for taking no consideration of the affection of flicker on the basis of the accumulation time determined in the accumulation time setting unit 13, and a brightness value calculation unit 10 for calculating a brightness value on the basis of the photometric signal from the light-receiving device 7.
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patent: 4843417 (1989-06-01), Ishida et al.
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Nikon Corporation
Perkey W. B.
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