G - Physics – 06 – K
Patent
G - Physics
06
K
354/40, 354/56
G06K 7/12 (2006.01) G06K 7/08 (2006.01)
Patent
CA 1169968
J 09 FV-4P BRW:ajh ELECTRONIC IDENTIFICATION SYSTEM ABSTRACT An electronic identification system for reading a pre-defined identifier code. A preferred application provides a credit card sized "identifier" which includes an array of electrical inductors, some of which are elec- trically connected in a selected pattern to define the identifier code. The identifier may be positioned close- ly proximate to a substantially identical inductor array included in a "reader" so that each identifier inductor is centred over a corresponding reader inductor. An alternating current is applied to each reader inductor in turn to induce an electromagnetic field in the region surrounding the driven inductor. The electromagnetic field so pro- duced induces a voltage across the identi- fier inductor centred over the driven reader inductor. If that identifier inductor is electrically connected to another identifier inductor(s) a current will flow in the other inductor(s) and a second electromagnetic field will be generated in the region(s) surrounding the connected inductor(s). The second electromagnetic field induces a voltage across reader inductor(s) centred under the con- nected inductor(s). Each reader inductor is separately sensed. If a current output signal is sensed at reader inductor(s) other than the driven inductor, it may be assumed that identifier inductor(s) corresponding to the driven inductor and to the reader inductor(s) at which an output signal is sensed have been electrically connected. A master control device may thus determine the identifier code by noting those identifier inductors which are elec- trically connected.
376860
Kruger Hendrik R.
Rayment David J.
Computrol Systems Limited
Oyen Wiggs Green & Mutala Llp
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