E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
342/11.2
E05B 49/00 (2006.01) G06K 7/08 (2006.01) G06K 19/07 (2006.01) G07C 9/00 (2006.01) G07F 13/00 (2006.01)
Patent
CA 1294688
A B S T R A C T An identification system, consisting of at least one stationary element and at least one movable element or token, said first element comprising a first induction coil adapted to generate a magnetic alternating field and being connected to a source of alternating current, and to means for detecting variations of said electromagnetic field, said detecting means being adapted to compare the detected field variations with a plurality of standard signal patterns, said second element comprising a second induction coil adapted to pick up the field of said first coil and being connected to a rectifier circuit adapted to rectify the induction voltage of said second coil, a capacitive storage means being provided for smoothing the rectified voltage, a control cir- cuit being fed by said rectified voltage and receiving, at an input terminal, the ac voltage induced in said second coil, said control circuit comprising encoding means adapted to produce, at an output terminal, code signals identifying said second element, said code signals being used for actuating a switch means which, in one condition, short-circuits said second coil. This system is characterised in that said ca- pacitive means is a small capacity, in particular an inte- grated or intrinsic capacity of the circuit means of said or each second element, in that said rectifier means is a full- wave rectifier bridge, two opposite corners thereof being connected to the respective ends of said second coil and one thereof also being connected to the signal input terminal of said control circuit, and in that said switch means is adapted to short-circuit one arm of said bridge which is connected to that end of said second coil which is not connected to the signal input terminal of said control circuit.
551925
Chubb Lips Nederland B.v.
Ridout & Maybee Llp
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