Optics: measuring and testing – Inspection of flaws or impurities – Having predetermined light transmission regions
Patent
1993-03-31
1994-10-18
Hille, Rolf
Optics: measuring and testing
Inspection of flaws or impurities
Having predetermined light transmission regions
356430, 356445, 356446, G01N 2189
Patent
active
053573358
ABSTRACT:
An optical detection device for screening magnetic tape for physical defects. The device has three light emitting diodes in a row perpendicular to the direction of travel of the tape. Two rows of photovoltaic detectors having three and two detectors, respectively, are parallel to the row of diodes. The diodes direct light toward the surface of the tape. If no physical defects are present, the light is reflected at the tape surface to the detectors. If a physical defect is present, the light is scattered by the defect and the amount of light which reaches the detector is reduced.
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Technical Datasheet from Silicon Detector Corporation, 5 pages, Sep. 1977, "General Purpose Detectors".
"GaAlAs Hermetic Infrared Emitting Diodes" from Optek Product Bulletin OP231W, Jul. 1989.
Anderson Roger J.
Hoel Michael K.
Sparks Johnny K.
Griswold Gary L.
Hille Rolf
Kirn Walter N.
Levinson Eric D.
Minnesota Mining and Manufacturing Company
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