Capacitive method and apparatus for accessing information...

Details Capacitive method and apparatus for accessing information... Capacitive method and apparatus for accessing information...

G - Physics

06

K

G06K 7/08 (2006.01)

Patent

CA 2299183

Barcode patterns or other meaningful patterns are printed with a differentially conductive ink. A sensor incorporating a plurality of capacitive couplings distinguishes features of the patterns by comparative measurements that are largely independent of variations between the sensor and the patterns affecting all of the couplings. The patterns can be distinguished despite being hidden from view, such as inside sealed envelopes.

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