Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-06-26
1981-01-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, G01K 2186
Patent
active
042438918
ABSTRACT:
Apparatus for detection of holes in a running web of photographic paper has a U-shaped housing with two spaced-apart legs between which a portion of the web travels toward a severing device. One leg of the housing contains several photoconductive detectors, and the other leg of the housing contains the light emitting portion of a light conducting prism whose light admitting portion is adjacent to a light source mounted in the housing inwardly of the detectors. The prism disperses the incoming light so as to uniformly illuminate the web portion in the gap between the two legs of the housing. The light source, the detectors and an amplifier for signals which are transmitted by the detectors are mounted on a plate which further carries conductors connecting the detectors with the amplifier.
REFERENCES:
patent: 3354467 (1967-11-01), Beekley
patent: 3585396 (1971-06-01), Ferguson et al.
patent: 3836958 (1974-09-01), McMurty
patent: 3874791 (1975-04-01), Thieme et al.
patent: 4068121 (1978-01-01), Bringhurst et al.
patent: 4084099 (1978-04-01), Harvey et al.
Dobler Rudolf
Weber Klaus
AGFA-Gevaert A.G.
Kontler Peter K.
Nelms David C.
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