Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-03-23
1981-04-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356383, G01N 2186
Patent
active
042648254
ABSTRACT:
A film detector system is provided for detecting film splices or other surface abnormalities longer than a desired length. A film support member is provided over which a strip of film travels which is to be analyzed. First and second light beams are projected parallel with the film surface across the film such that thickness increases due to surface abnormalities on the film intercept portions of the light beam. As a result a shadow is cast on first and second light detectors. The first and second light beams are spaced from one another such that when a film splice or other abnormality intercepts one of the light beams, the other light beam is not simultaneously intercepted if the film splice or abnormality is of normal length but will be intercepted simultaneously if the film splice is of abnormal length. Outputs from the first and second light detectors are compared and the film travel is stopped when the signal is simultaneously received from each of the light detectors.
REFERENCES:
patent: Re28025 (1974-05-01), Murata et al.
patent: 3349905 (1967-10-01), Crawford
patent: 3778802 (1973-12-01), Wallace
patent: 3856414 (1974-12-01), Menary
patent: 4088411 (1978-05-01), Ahlquist et al.
patent: 4166700 (1979-09-01), Bowen et al.
Nelms David C.
Research Technology Inc.
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