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US 4,378,504 AGranted
Proximity switch
AssigneeOmron Tateisi Electronics Co.
InventorHiroyuki Yamasaki
Life of this patent
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Abstract
A high-frequency oscillation type proximity switch comprising a resonance circuit in which a detection coil is used as a pickup for sensing the approach of an object thereto and a resonance capacitor is disposed at a position very close to the detection coil so that the resistance of a cable connecting the resonance circuit to its associated oscillation circuit can be substantially ignored in the resonance circuit.
Claims9
A proximity switch, comprising:
- a detection coil having a core, said core having a front and a back surface;
- a capacitor disposed on the back surface of said core and electrically connected to said detection coil to form a resonance circuit;
- an oscillation circuit is operative connection with said resonance circuit;
- an electrostatic shield surrounding said oscillation circuit;
- a long, narrow, insulating member;
- said resonance circuit and said oscillator circuit with said shield being arranged in a narrow, linear relationship and being disposed inside of said insulating member;
- a narrow housing, said resonance circuit, oscillation circuit, electrostatic shield, and insulating member comprising a single assembly disposed within said housing.
4 more elements
Dependencies are inferred from the claim text.