Apparatus for determining light reflection from a focal plane sh

Details Apparatus for determining light reflection from a focal plane sh Apparatus for determining light reflection from a focal plane sh

1980-01-07

1981-10-20

Gellner, Michael L.

G03B 7083

Patent

active

042957206

ABSTRACT:
An apparatus for determining the amount of light reflected from a focal plane shutter includes a photoelectric transducer element which determines light reflection from the shutter blind surface and the film surface. The transducer element produces a photocurrent which charges an integrating capacitor. A correcting capacitor is disposed so as to be connected in parallel with the integrating capacitor during a part of the exposure time in order to correct the output voltage thereof for different reflectivities of the film surface and the shutter blind surface. The correcting capacitor is charged to the same voltage as that appearing across the integrating capacitor at the time the correcting capacitor is connected in parallel with the integrating capacitor.

REFERENCES:
patent: 3994001 (1976-11-01), Maitani et al.

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