Patent
1980-07-03
1982-02-16
Hartary, Joseph W.
354 59, G03B 708
Patent
active
043156770
ABSTRACT:
A calibrating arrangement is disclosed for use in accurately correcting for exposure errors in an exposure control system having a plurality of photoresponsive regions. A scene light detecting and integrating circuit includes a pair of photoresponsive regions. Each region provides an output response as a function of its photoresponsiveness to the scene radiation intensity incident thereon. A first light attenuating member is selectively positioned to attenuate scene radiation incident to at least one of the regions so that the output of the one region can be correlated to a preselected output therefor. Independently positionable relative to at least the other region is a second light attenuating member. The second attenuating member is movable independently of the first light attenuating member to attenuate scene radiation incident to at least the other region so that the output of the other region can be correlated to a preselected output therefor.
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Johnson Bruce K.
Whiteside George D.
Hartary Joseph W.
Payne Leslie J.
Perkey William B.
Polaroid Corporation
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