Optics: measuring and testing – Inspection of flaws or impurities – Having predetermined light transmission regions
Patent
1979-02-14
1981-11-24
Corbin, John K.
Optics: measuring and testing
Inspection of flaws or impurities
Having predetermined light transmission regions
250224, 250572, 350171, G01N 2189
Patent
active
043021050
ABSTRACT:
Detection apparatus for finding holes in moving webs uses a row of individual mutually sideways displaced stepped mirror strips in combination with a scanning device which periodically scans a light beam from a laser over the individual mirrors of each strip, to generate a scanning light curtain directed at the surface of a web. A detection device comprising a row of individual Fresnel lenses and associated photoelectronic detectors is arranged parallel to the row of mirror strips to receive light transmitted through any hole present in the web. The individual Fresnel lenses focus any light received onto their associated photoelectric detectors the outputs from which signify the presence of the hole. Means are provided for introducing a degree of divergence into the beams deflected from the stepped mirrors and forming the light curtain whereby the light curtain scans a cross the web without gaps.
REFERENCES:
patent: 4011857 (1977-03-01), Rice
patent: 4127771 (1978-11-01), Sick
Arnold Bruce Y.
Corbin John K.
Erwin Sick GmbH - Optik-Elektronik
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