Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-02-02
1990-10-30
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250571, G01N 2186
Patent
active
049670948
ABSTRACT:
Apparatus for detecting the presence of processed photograph film at a particular location comprises a light source which emits green or blue light having a wavelength in the range of 420-600 nanometers. A light sensors positioned to receive light from the light source when the film is not present. An infrared filter and a filter for transmitting light in the range of wavelengths emitted by the light source are positioned in front of the light sensor.
REFERENCES:
patent: 3435243 (1969-03-01), Webb
patent: 3696981 (1972-10-01), Levy
patent: 4167678 (1979-09-01), Mischo et al.
patent: 4751394 (1988-06-01), Matsuoka et al.
Backus Richard J.
Horton Robert L.
Beck George
Eastman Kodak Company
Fields Roger A.
Nelms David C.
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