Proximity switch with improved response time and antimagnetic fi

Details Proximity switch with improved response time and antimagnetic fi Proximity switch with improved response time and antimagnetic fi

1985-03-08

1987-01-20

LaRoche, Eugene R.

Oscillators

With device responsive to external physical condition

324327, 324236, 340686, G01N 2700

Patent

active

046382623

ABSTRACT:
A high frequency oscillation type proximity switch including an oscillating circuit having an adjusting resistor changing the oscillating state, the switch being adapted to detect an object by a decrease in the oscillation output due to the approach of the object, wherein when the oscillation output decreases, the switch detects the object while changing the resistance of the adjusting resistor to facilitate the restart of oscillation. Thus, when the object disappears after the detection of the object, oscillation is easily started, so that response to the detection of objects is improved. Further, by providing the output circuit with an integrating circuit having a time constant greater than the commercial alternating current, the oscillation is caused to be intermittent at the zero-cross point in the alternating current, thus making it possible to construct an anti-magnetic field type proximity switch which is usable even in an environment where an intense ac magnetic field is present.

REFERENCES:
patent: 3747011 (1973-07-01), Buck
patent: 3747012 (1973-07-01), Buck
patent: 3805185 (1974-04-01), Kishi et al.
patent: 4001718 (1977-01-01), Wilson et al.
patent: 4543527 (1985-09-01), Schuchmann et al.

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