Focus detecting apparatus

Details Focus detecting apparatus Focus detecting apparatus

1989-10-19

1990-06-05

Hix, L. T.

354476, G03B 300

Patent

active

049318225

ABSTRACT:
A focus detecting apparatus in a camera comprises quantity-of-light detecting means producing an output in conformity with the intensity of an incident light from an object to be photographed, a charge accumulation type light receiving device having a plurality of light receiving elements, each of the light receiving elements receiving the light from the object to be photographed and accumulating therein charges conforming to the light, the light receiving device outputting a plurality of accumulation signals conforming to the plurality of light receiving elements, and calculating means for effecting the focus detection of a photo-taking lens on the basis of the plurality of accumulation signals of the light receiving device. The calculating means controls the charge accumulation time of the light receiving device in conformity with the output from the quantity-of-light detecting means when the focus detecting apparatus effects the first focus detection after the starting thereof, and controls the Nth charge accumulation time of the light receiving device on the basis of the plurality of accumulation signals obtained by the N-1th focus detection when the focus detecting apparatus effects the Nth (N.gtoreq.2) focus detection after the starting thereof.

REFERENCES:
patent: 4660955 (1987-04-01), Ishida et al.

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