Metal detector protected from malfunction caused by radio waves

Details Metal detector protected from malfunction caused by radio waves Metal detector protected from malfunction caused by radio waves

1990-06-21

1991-07-02

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

324327, 324236, 331117R, G01V 311, H03B 512

Patent

active

050293001

ABSTRACT:
A sensor according to this invention comprises an oscillation circuit including an LC resonant circuit, wherein a detection signal is prohibited upon arrival of an external radio wave.

REFERENCES:
patent: 4644298 (1987-02-01), Kamiya et al.
patent: 4761603 (1988-08-01), Nodera
patent: 4803444 (1989-02-01), Takahashi

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