Proximity switch

Details Proximity switch Proximity switch

1987-12-02

1989-02-07

LaRoche, Eugene R.

Oscillators

With device responsive to external physical condition

331117R, 324236, H03B 512

Patent

active

048034444

ABSTRACT:
A proximity switch including a high-frequency oscillation device, including a detection coil, for generating an output signal which represents the detection of the approach of an object. A rectification device is included for rectifying and smoothing the output signal from the high-frequency oscillation device to generate an output signal. A feedback device feeds back the output signal from the rectification device to the high-frequency oscillation device. An output device generates a signal when the quantity of the feedback by the feedback device has exceeded a predetermined value. The signal generated by the output device representing the approach of the object.

REFERENCES:
patent: 4613830 (1986-09-01), Kamiya et al.

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