Oscillator circuit and proximity switch using

Details Oscillator circuit and proximity switch using Oscillator circuit and proximity switch using

1992-10-14

1993-11-23

Mis, David

Oscillators

With device responsive to external physical condition

331 74, 331151, H03K 3023, H03K 1795

Patent

active

052648095

ABSTRACT:
A proximity switch which can detect any metal with equal changing rate of oscillating frequency, regardless of what kind of metal it may be (magnetic or nonmagnetic), is disclosed. The invention employs a series circuit consisting of a resistor and a first capacitor connected to the output side of a comparator. A detector coil and a second capacitor are connected in parallel to the first capacitor. By selecting appropriate capacitance and resistance values for these components, it can be insured that the change in oscillating frequency corresponding to the distance of an approaching object will be very nearly be identical regardless of the type of metal of which the object is constituted. An embodiment employing a frequency to voltage converter is also disclosed. The arrangement provides continuous detection also suitable for use in range indicator and self diagnosis applications.

REFERENCES:
patent: 5012206 (1991-04-01), Tigges
patent: 5034704 (1991-07-01), Tomioka et al.

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