Combination of a proximity switch and a target, a proximity...

Details Combination of a proximity switch and a target, a proximity... Combination of a proximity switch and a target, a proximity...

H - Electricity

03

K

H03K 17/95 (2006.01) G06K 7/08 (2006.01)

Patent

CA 2089581

- 21 - ABSTRACT An inductive type proximity switch S includes an open-ended loop L3 adjacent to the inductor L1, L2 of the parallel resonant circuit of its main LC oscillator. A high speed bistate switch S1 is connected between the ends of the loop L3. A pulsed input to the switch S1 causes sequential making and breaking of a connection between the ends of the loop L3 whereby the loop L3 functions as a Faraday shield to inhibit mutual inductive linking of the inductor L1, L2 with an inductor L4 of a passive LC resonant circuit L4, C4 of a target T when the target T is in proximity with the proximity switch S and the connection between the ends of the loop L3 is made by the bistate switch S1. Figure 1

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