Proximity sensor

Details Proximity sensor Proximity sensor

2007-11-20

2007-11-20

Swarthout, Brent A. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C324S236000, C324S682000, C331S064000, C340S562000, C340S941000, C361S180000

Reexamination Certificate

active

11094324

ABSTRACT:
An operation section2is provided to a proximity sensor including: a detection section having an oscillation circuit10;and an amplification section2having a function detecting a metal body using an oscillation amplitude of the oscillation circuit10.In a set mode, when an operation to set an adjustment value for a sensitivity adjustment (a sensitivity adjustment value) is conducted in an operation section22,CPU20generates a sensitivity adjustment signal in digital quantity indicating the sensitivity adjustment value and outputs the signal to a D/A converter25.The sensitivity adjustment signal digital-to-analog converted by the D/A converter25is given to a feedback circuit13through a voltage adjustment circuit26.Since the feedback circuit13is designed so as to change a feedback current quantity according to an applied voltage, a current with a magnitude matching a value the sensitivity adjustment signal is fed back to a resonance circuit11to thereby control an oscillation amplitude.

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patent: 5801530 (1998-09-01), Crosby et al.
patent: 6995670 (2006-02-01), Wadlow et al.
patent: 100 46 147 (2002-02-01), None
patent: 3440566 (2003-06-01), None

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