Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1979-06-25
1981-03-31
Griffin, Donald A.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250214P, G03B 7081
Patent
active
042589932
ABSTRACT:
A control apparatus is disclosed for discriminating between light emitted from sources having respectively different flicker ratios (the ratio of the brightest and the dimmest intensities during a given time period). A photocell produces a voltage having a DC component proportional to the log of the average intensity of incident light and an AC component proportional to the log of the flicker ratio. After the DC component is removed, the AC component is amplified and may be applied to a filter-moving control means to cause appropriate color-correcting filters to be interposed between the scene and photosensitive material, as for instance in a camera. Alternatively, the AC component may control a marking mechanism to encode the film with a mark readable during the subsequent printing process.
REFERENCES:
patent: 2730654 (1956-01-01), Rabinow
patent: 3246586 (1966-04-01), Hunt
patent: 3475616 (1969-10-01), Stimson et al.
patent: 3500730 (1970-03-01), Matsubara et al.
patent: 3651749 (1972-03-01), De Groot
patent: 3672268 (1972-06-01), Scheibel
patent: 3850530 (1974-11-01), Uno et al.
patent: 4041308 (1977-08-01), Fujita
patent: 4079388 (1978-03-01), Takahama et al.
Close Thomas H.
Eastman Kodak Company
Griffin Donald A.
Perkey W. B.
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