Focus detection device

Details Focus detection device Focus detection device

1994-09-29

1996-06-11

Adams, Russell E.

354406, 354407, 354432, G03B 1336

Patent

active

055260888

ABSTRACT:
A device includes a charge accumulation type image sensor, consisting of a plurality of pixels whose charge accumulation states are simultaneously controlled, for generating an object image signal corresponding to the amount of light received by the pixels, an accumulation control means for controlling the charge accumulation time of the charge accumulation type image sensor, and a focus detection means for executing a focus detection calculation on the basis of the object image signal so as to detect a focus state in a focus detection area set in a frame. When a state requiring flashing of a flashlight is detected, the accumulation control means executes accumulation control placing an importance on a low-luminance portion of an object field by prolonging the charge accumulation time as compared to a state requiring no flashing of the flashlight. Under the charge accumulation control, a focusing operation can be reliably performed even for a low-luminance main object.

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