Proximity detector
First Claim
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1. A proximity detector comprising;
- a pair of antennae being disposed along the front edge of a door and at a space therebetween;
a pair of coils constituting series resonance circuits, together with earth electrostatic capacities of said antennae which are connected in series with said coils;
an AC power source for supplying voltages to said series resonance circuits;
rectifying circuits for rectifying the voltages produced in said antennae by said AC power source; and
differential amplifier circuit for amplifying difference between the outputs of said rectifying circuits, the output of said differential amplifier controlling the movement of said door.
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Abstract
A proximity detector comprises a pair of antennae being disposed along the front edge of a door and at a space therebetween, a pair of coils constituting series resonance circuits, together with each electrostatic capacities of the antennae which are connected in series with the coils, an AC power source for supplying voltages to the series resonance circuits; rectifying circuits for rectifying the voltages produced on the antennae by the AC power source, and a differential amplifier circuit for amplifying difference between the outputs of the rectifying circuits, the output of the differential amplifier controlling the movement of the door.
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Citations
3 Claims
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1. A proximity detector comprising;
- a pair of antennae being disposed along the front edge of a door and at a space therebetween;
a pair of coils constituting series resonance circuits, together with earth electrostatic capacities of said antennae which are connected in series with said coils;
an AC power source for supplying voltages to said series resonance circuits;
rectifying circuits for rectifying the voltages produced in said antennae by said AC power source; and
differential amplifier circuit for amplifying difference between the outputs of said rectifying circuits, the output of said differential amplifier controlling the movement of said door. - View Dependent Claims (2, 3)
- a pair of antennae being disposed along the front edge of a door and at a space therebetween;
Specification