Rear light detecting apparatus in a camera

Details Rear light detecting apparatus in a camera Rear light detecting apparatus in a camera

1991-02-14

1992-07-07

Perkey, W. B.

354414, 354432, G03B 728, G03B 1336, G03B 1503

Patent

active

051287072

ABSTRACT:
A rear light detecting apparatus in a camera for detecting whether an object is in rear light comprises a center portion light meter for detecting the brightness of an object lying in the central area of the photographing picture plane, a peripheral portion light meter for detecting the brightness of an object lying in the peripheral area of the central area, a first rear light discriminator for judging on the basis of the result of the detection by the two light meters whether the object lying in the central area is in a rear light state, a focus detector for detecting the focuses of a plurality of objects lying in at least a predetermined detection area within the central area of the picture plane from a pair of object images formed on an image sensor, an object selector for selecting a main object on the basis of the result of the detection by the focus detector, a second rear light discriminator for judging from the outputs of the image sensor which correspond to the selected main object and the other objects whether the main object is in a rear light state, and a controller outputting a light emission signal for causing an electronic flash device to emit light during photographing when at least one of the first and second rear light discriminators is judged to be in a rear light state.

REFERENCES:
patent: 4423936 (1984-01-01), Johnson
patent: 4664495 (1987-05-01), Alyfuku et al.
patent: 4690536 (1987-09-01), Nakai et al.
patent: 4862206 (1989-08-01), Ootsuka et al.
patent: 4969005 (1990-11-01), Tokunaga
patent: 4984006 (1991-01-01), Ikemura et al.
patent: 5021818 (1991-06-01), Satoh et al.

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