Electronic proximity sensor

Details Electronic proximity sensor Electronic proximity sensor

1984-07-30

1987-05-05

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

330288, 328 5, 361180, H03K 326, H01M 4112

Patent

active

046635424

ABSTRACT:
An electronic sensor of the contactless type has a free-running oscillator with internal positive feedback supplemented by an external negative feedback including a capacitive path whose impedance is normally high but is lowered in the presence of an object to be detected, thereby reducing the output signal of the oscillator from a normal amplitude above a predetermined level to a diminished amplitude below that level. The negative feedback is provided through an IGFET, e.g. of n-channel depletion type, with the aid of a capacitor bridging its source and gate electrodes to form with the external capacitance a voltage divider for the output signal of the oscillator.

REFERENCES:
patent: 3201774 (1965-08-01), Uemura
patent: 3469204 (1969-09-01), Magyar et al.
patent: 3733597 (1973-05-01), Healey et al.
patent: 4336491 (1982-06-01), Buck et al.

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