Capacitance type detection device, sensor unit, and control system for detecting approach of object, and method for same

摘要

A capacitance type detection device may include a sensor electrode forming a capacitor with respect to a peripheral conductor; a measurement unit measuring the floating capacitance of the sensor electrode, which changes correspondingly to a positional relation between the sensor electrode and the detection object; and a judgment unit judging the approach of the detection object in a case in which there is satisfied an approach detection condition including a fact that a magnitude correlation between a time rate-of-change of the floating capacitance measured by the measurement unit and a predetermined time rate-of-change which is defined correspondingly to a combination of the detection object and an object to be discriminated so as to be different from the detection object lies in a predetermined relation.

主权项

1. A capacitance type detection device which detects an approach of an electroconductive detection object comprising:
a sensor electrode forming a capacitor with respect to a peripheral conductor; a measurement unit measuring a floating capacitance, which changes correspondingly to a positional relation between said sensor electrode and said detection object, of said sensor electrode; and a judgment unit configured to judge whether a magnitude correlation between a rate of change of the floating capacitance measured by said measurement unit and a predetermined rate of change of the floating capacitance, which is defined correspondingly to a combination of said detection object and another object to be discriminated from said detection object, satisfies a predetermined relation, wherein a threshold table, in which the predetermined rate of change of the floating capacitance is registered, is used in the judgment unit.