Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2004-11-24
2008-12-09
Epps, Georgia Y. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140RC
Reexamination Certificate
active
07462811
ABSTRACT:
A circuit for detecting light comprising: a) a light-integrating photosensor circuit responsive to light for producing a variable voltage signal representing the accumulation of the light over time; and b) a measurement circuit for receiving a time measurement signal and the variable voltage signal to produce an output value representing the time required for the variable voltage signal to reach a predetermined voltage level, wherein the output value is proportional to the light accumulated during the required time.
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Cok Ronald S.
Silbermann Joshua M.
Anderson Andrew J.
Eastman Kodak Company
Epps Georgia Y.
Owens Raymond L.
Shaw Stephen H.
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