Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-05-25
1992-04-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250225, G01N 2186
Patent
active
051071312
ABSTRACT:
A method for detection of the edge and/or shape of transparent films, wherein the incident rays from a light source enter a polarizer to yield the linearly polarized light for irradiation to a transparent film with a property of rotatory polarization, and the rotatorily polarized light therefrom is transmitted through an analyzer with a polarization axis orthogonal to that of the polarizer, allowing the transmitted light to indicate the edge position and/or shape of the transparent film. An apparatus for detection of the edge and/or shape of transparent films, which is furnished with a polarizer, analyzer and detector to utilize the property of rotatory polarization of a transparent film placed between the polarizer and the analyzer, wherein the polarizer linearly polarizes the incident rays from a light source, emitting the light to be fed to the analyzer, a polarization axis of which is orthogonal to that of the polarizer, and the detector recognizes the output of the analyzer.
REFERENCES:
patent: 2904700 (1959-09-01), Rockey
Ikeno Hiroshi
Kabutomori Masuo
Okada Hiromi
Saitou Tamio
Davenport T.
Fuji Photo Film Co. , Ltd.
Nelms David C.
Nireco Corporation
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