Focus state detection device

Details Focus state detection device Focus state detection device

1995-08-14

1997-02-18

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Having accumulation photoarray and time control means

396125, G03B 1336

Patent

active

056045611

ABSTRACT:
A focus state detection device having a shooting lens, a mirror which guides light rays which have passed through the shooting lens to the photoelectric conversion element array, a focus state detection algorithm circuit which detects the focus state of the shooting lens through a focus state detection algorithm on the basis of output signals from the photoelectric conversion element array, and an accumulation control circuit which controls the electric charge accumulation time in the photoelectric conversion element array that, when it is detected by the focus state detection algorithm circuit that the shooting lens is in focus or near focus, the accumulation control circuit conducts accumulation control by fixing the next accumulation time to be the accumulation time at the time when focus or near focus is detected.

REFERENCES:
patent: 4340819 (1982-07-01), Ogasawara et al.
patent: 4411505 (1983-10-01), Sakai et al.

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