Capacitive sensor without capacitor element

Abstract

The invention provides a capacitive sensor without a capacitor element, and belongs to the technical field of a sensor. The capacitor sensor solves the technical problems that for an existing capacitive sensor, under the same hardware condition, errors exist among capacitance value individuals of capacitors, capacitance values of capacitor elements can be continuously changed along with a change of a temperature and the like. The capacitive sensor without the capacitor element comprises a first copper sheet and a second copper sheet which are respectively clung and fixed to the top surface andthe bottom surface of a substrate; a volume of the first copper sheet is greater than that of the second copper sheet; and the upper lateral surface of the first copper sheet is clung to the lower lateral surface of a non-conductor triggering part. The capacitive sensor obtains better sensing accuracy when reducing independence on the element (i.e., the capacitor), and the sensing accuracy cannotbe changed due to different application environments, can be kept consistent always and is high in stability.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a capacitive sensor without capacitive elements. Background technique [0002] At present, the traditional capacitive sensor is to set the sensing sensitivity (sensing distance) through the capacitance value of the capacitive element on the circuit under the condition of other hardware being the same. However, this type of capacitive sensor still has two defects that cannot be improved under the same hardware conditions: 1. There is an error between individual capacitance values; 2. The capacitance value of the same capacitive element will continue to change as the temperature changes , It is impossible to keep the sensing sensitivity (sensing distance) consistent under various temperature conditions under the same hardware conditions. As a result, there must be a certain proportion of non-induction or long-induction problems in capacitive sensors, and this problem belongs to th...

AI Technical Summary

Problems solved by technology

However, this type of capacitive sensor still has two defects that cannot be improved under the same hardware conditions: 1. There is an error between individual capacitance values; 2. The capacitance value of the same capacitive element will continue to change as the temperature changes , it is impossible to keep the sensing sensitivity (sensing distance) consistent under various temperature conditions under the same hardware conditions

As a result, there must be a certain proportion of non-induction or long-induction problems in capacitive sensors, and this problem belongs to the category that cannot be improved.

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