PROXIMITY DETECTION SENSOR AND PROXIMITY DETECTION METHOD

PROBLEM TO BE SOLVED: To provide a proximity detection sensor for performing high-accuracy detection with a circuit structure for computing and outputting a difference in pulse width. SOLUTION: This proximity detection sensor is equipped with a detection electrode 2, a first detection circuit 4 conv...

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Bibliographic Details
Main Authors MISAKI NOBUMASA, NAKAMURA YASUSHI
Format Patent
LanguageEnglish
Published 13.11.2008
Subjects
BASIC ELECTRIC ELEMENTS
BASIC ELECTRONIC CIRCUITRY
DETECTING MASSES OR OBJECTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
PULSE TECHNIQUE
RELAYS
SELECTORS
TESTING
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Summary:PROBLEM TO BE SOLVED: To provide a proximity detection sensor for performing high-accuracy detection with a circuit structure for computing and outputting a difference in pulse width. SOLUTION: This proximity detection sensor is equipped with a detection electrode 2, a first detection circuit 4 converting a change in capacitance between the detection electrode 2 and ground into a detection pulse signal P1to output it, a reference capacitor 6 charged during a prescribed time period, a second detection circuit 8 converting a change in capacitance of the reference capacitor 6 into a reference pulse signal P2to output it, a trigger signal generation circuit 10 generating a trigger signal TG for charging the detection electrode 2 and the reference capacitor 6 at prescribed time intervals, and a computation circuit 12 for calculating a difference pulse signal P3from the pulse signal P1inputted from the detection circuit 4 and the pulse signal P2inputted from the detection circuit 8. COPYRIGHT: (C)2009,JPO&INPIT
Bibliography:Application Number: JP20070119009