Device having dual sensors for checking patterns disposed on a m

Details Device having dual sensors for checking patterns disposed on a m Device having dual sensors for checking patterns disposed on a m

1997-02-10

2000-02-08

Lee, Michael G

Registers

Records

Particular code pattern

23546216, 23546225, G06K 1906

Patent

active

060219505

ABSTRACT:
Method and device for checking patterns (1) disposed on a material strip (30) which patterns (1) consist of groups of dark and light areas (2,2*,3,3*) succeeding in the travelling direction (v) of the material strip (30) and the checking respectively, by displacing the position of the dark areas (2,3) and/or the light areas (2*,3*) of one group with respect to a related detector (8,9) in regard to the dark areas (2,3) and/or light areas (2*,3*) of another group with respect to another related detector (8,9) by detecting the existence or non-existence of dark areas and/or light areas and by creating a sequence of output signals dependent on the result of the detection by combining the output signals comprising information concerning the dark or light areas (2,2*,3,3*) of each detector (8,9) with the output signals depending on the detection of one of the dark or light areas (2,2*,3,3*) of the other detector (8,9) in a predetermined way by for example alternately activating each detector (8,9) by the other detector (8,9) and by comparing this sequence of output signals with a predetermined sequence of signals.

REFERENCES:
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patent: 3796862 (1974-03-01), Asija
patent: 3896917 (1975-07-01), Taplin
patent: 3922539 (1975-11-01), Carnes et al.
patent: 4013893 (1977-03-01), Hertig
patent: 4499372 (1985-02-01), Nakano
patent: 4515481 (1985-05-01), Yamada et al.
patent: 4600841 (1986-07-01), Tokuno et al.
patent: 4614430 (1986-09-01), Hara et al.
patent: 4698514 (1987-10-01), Hilmersson et al.
patent: 4704533 (1987-11-01), Rose et al.

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