Method and apparatus for the detection of the location of multip

Details Method and apparatus for the detection of the location of multip Method and apparatus for the detection of the location of multip

1995-11-17

1997-11-25

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250557, 25055947, G01N 2189

Patent

active

056915330

ABSTRACT:
This invention pertains to a detection system for locating and counting identification marks attached to a written or printed item. A signal processing method and apparatus is described which allows detection of multiple character marks as a single event in continually moving linear materials. The marks are passed between the path of a detection zone comprising a light source and a photodetector to precipitate a voltage drop and feeding that drop to a circuit that recognizes the drop and simultaneously triggers a time window during which changes in voltage are ignored, which time window is no longer than the time it takes for a full mark to pass under the zone and shorter than the time it takes for the leading edge of the next multicharacter marks to reach the detection zone.

REFERENCES:
patent: 2928949 (1960-03-01), Steinbuch
patent: 3700909 (1972-10-01), Murray et al.
patent: 4249081 (1981-02-01), Cole et al.
patent: 4293774 (1981-10-01), Pongracz
patent: 4389575 (1983-06-01), Cole
patent: 5095219 (1992-03-01), Laumann et al.

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