Contactless proximity sensor with multilevel response

Details Contactless proximity sensor with multilevel response Contactless proximity sensor with multilevel response

1981-10-07

1984-01-03

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307308, 307311, 328 5, 340691, A03K 326, G08B 300, H03K 5153

Patent

active

044244584

ABSTRACT:
A signal detector of a contactless proximity sensor feeds three voltage comparators with reference inputs connected to points of different threshold potentials. When the incoming signal exceeds only the lowest threshold, a light-emitting diode is flashed at a low frequency; when the intermediate threshold is surpassed, the diode flashes at a higher frequency, whereas its light emission is continuous in the presence of a signal level above the highest threshold. Only in the last two instances will a load-control circuit be switched.

REFERENCES:
patent: 3927571 (1975-12-01), Athey
patent: 4079323 (1978-03-01), Blanyer
patent: 4180811 (1979-12-01), Yoshimura et al.
patent: 4311994 (1982-01-01), Kuribayashi

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