Oscillators – With device responsive to external physical condition
Patent
1988-04-29
1989-11-07
Grimm, Siegfried H.
Oscillators
With device responsive to external physical condition
324327, 324236, 331117R, H03K 1795, G01V 310
Patent
active
048795313
ABSTRACT:
An inductive proximity switch including an oscillator circuit with a frequency resonant circuit (1) determining the frequency and with an impedance member (7) determining the amplification, this impedance member containing an impedance resonant circuit with a sensor coil (9) that can be influenced by the approach of a metallic trigger. In order to provide that the proximity switch has the same activating range for ferrous and nonferrous trigger metals, the resonant frequency (f.sub.o) of the frequency resonant circuit (1) and the critical impedance value (Z.sub.o) of the impedance member (7) are tuned, according to this invention, to the coordinates (f.sub.o,Z.sub.o) of the point of intersection (P.sub.o) of the impedance/frequency characteristics (II, III), resulting for respectively identical activating range, for an NF trigger and for an FE trigger.
REFERENCES:
patent: 3601691 (1971-08-01), Gardiner
patent: 4513257 (1985-04-01), Miyamoto et al.
patent: 4719362 (1988-01-01), Nest et al.
Donner, "Position Detector", IBM Technical Disclosure Bulletin, vol. 6, No. 5, Oct. 1963, pp. 24-25.
Brasse Dierk
Tigges Burkhard
Grimm Siegfried H.
Werner Turck GmbH & Co. KG
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