Image sensor system and auto-focus detection device

Details Image sensor system and auto-focus detection device Image sensor system and auto-focus detection device

1995-09-05

1997-07-29

Adams, Russell E.

Photography

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

Having accumulation photoarray and time control means

G03B 1332

Patent

active

056529252

ABSTRACT:
The invention has the object of obtaining an image output of the appropriate size, even in cases in which the saturation level changes when the amplifier gain is switched, so that high precision focus detection can be carried out continually. The image sensor system includes an image sensor that outputs an image signal according to the light intensity distribution of the subject image that has been composed by the optical system; an amplifier that amplifies the image signal from the image sensor; an amplification ratio switching capability that changes the amplification ratio of the amplification means to a prescribed amplification ratio; an accumulation time interval calculator that calculates the accumulation time interval of the image sensor based on the target value of the image sensor output that has been selected according to the amplification ratio and the amplified image output; and an image sensor controller that controls the operation of the image sensor based on the accumulation time interval that is calculated by the accumulation time interval calculator.

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