G - Physics – 06 – K
Patent
G - Physics
06
K
340/123.6
G06K 9/00 (2006.01) G06K 7/08 (2006.01) G06K 19/067 (2006.01) G07D 7/02 (2006.01)
Patent
CA 1137587
ABSTRACT Apparatus for detecting and providing a signal from detection indicia carried by a controlled document for determining its character, the document passing through the apparatus at high speed, the detection indicia being substantially more conductive than the substrate. Detection is effected by establishing a capacitive element with the aid of a charging electrode passing relative to the detection indicia and in such passage inducing a capacitive charge onto the detection indicia, movement of the charged detection indicia relative to a sensor electrode downstream establishing a second capacitive element. The charge remaining on the detection indicia moving into juxtaposition relative to the sensor electrode, tends to leak off through coupling with this sensor electrode. The leakage current is used to provide a signal whose amplitude is detected and to operate certain output means such as indicators, ejectors, counters, or the like which will respond in accordance with the character of the detection indicia, for example, its size.
344833
Coulter Systems Corporation
Johnson Douglas S. Q.c.
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