Brightness measuring apparatus for providing adequate object bri

Details Brightness measuring apparatus for providing adequate object bri Brightness measuring apparatus for providing adequate object bri

1989-05-16

1990-10-16

Perkey, W. R.

G03B 708

Patent

active

049639153

ABSTRACT:
The brightness measuring apparatus according to this invention comprises a plurality of light receiving elements for respectively receive light from a plurality of areas in a photographic range and output values corresponding to the areas based on the amounts of light received, and judges whether or not the object is under rear light conditions based on the outputted values and the value of rear light detection level which is decided based on focal length of a photographing lens, image magnification, object distance, or brightness of background.

REFERENCES:
patent: 4331400 (1982-05-01), Brownstein et al.
patent: 4664495 (1987-05-01), Alyfuku et al.
patent: 4690536 (1987-09-01), Nakai et al.
patent: 4705382 (1987-11-01), Mukai et al.
patent: 4782357 (1988-11-01), Hayakawa et al.
patent: 4800409 (1989-01-01), Matsuda et al.

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