Photography – Exposure control circuit – Having plural photocells
Reexamination Certificate
2007-03-21
2009-08-04
Perkey, W. B. (Department: 2862)
Photography
Exposure control circuit
Having plural photocells
C396S048000, C396S210000, C396S213000, C348S229100
Reexamination Certificate
active
07570883
ABSTRACT:
An image pickup apparatus includes an automatic exposure controller automatically controls ISO sensitivity in response to the output signal of an exposure metering circuit, and controls the exposure so that exposure setting is determined based on the brightness values of both the central photometry area and the remaining photometry area of an imaging frame. The automatic exposure controller controls the exposure setting so that when the ISO sensitivity is set to its higher value, the weighting factor of the central photometry area is higher than that of the remaining photometry area. The automatic exposure controller further determines whether or not a light source is behind an object, and, if it is the case, reduces the adjusted exposure setting so as to increase the amount of light incident on the image pickup apparatus.
REFERENCES:
patent: 4445778 (1984-05-01), Nakauchi
patent: 5272539 (1993-12-01), Kondo
patent: 5339163 (1994-08-01), Homma et al.
patent: 5461452 (1995-10-01), Iwasaki
patent: 7415203 (2008-08-01), Lee
patent: 2007/0242944 (2007-10-01), Mizusawa
patent: 2005-184508 (2005-07-01), None
Adams Bret
Birch & Stewart Kolasch & Birch, LLP
Fujifilm Corporation
Perkey W. B.
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