Capacitive Sensor Assembly With Insulated Loop Conductor
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Solution Overview
Problem
Existing sensor arrangements with metallic caps increase the risk of electrical contact with the sensor electrode, compromising protection and requiring costly encapsulation methods to maintain functionality, while plastic caps are not aesthetically appealing to users.
Innovation Solution
A sensor arrangement featuring an electrically conductive cap and an electrically insulated conductor forming a housing with a loop shape, which provides protection against electrostatic charges and allows for cost-effective production by eliminating the need for separate insulation, with the conductor serving as both sensor electrode and being directly connected to a control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the cap is made of metal to improve aesthetic appearance, then the visual quality is improved, but the electrical protection of the sensor electrode is compromised
Solution Approach 1:
The cap is segmented into two functional parts: an outer metallic cap portion providing aesthetic appearance, and an inner insulating portion providing electrical protection. This segmentation allows each part to fulfill its specific function independently, resolving the contradiction between appearance and protection.
Solution Approach 2:
The cap combines metallic and insulating materials in a composite structure. The metallic outer layer provides the desired aesthetic appearance, while the insulating inner layer maintains electrical protection of the sensor electrode, thus resolving the contradiction through material composition.
2Reliability
If the sensor electrode is encapsulated with epoxy resin to maintain electrical protection, then the electrical protection is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The insulating function previously requiring separate encapsulation is merged into the cap structure itself. The insulating portion is integrated directly into the cap, eliminating the need for additional epoxy resin encapsulation steps and reducing manufacturing complexity.
Solution Approach 2:
The cap structure itself provides the electrical protection function through its insulating portion, rather than requiring external protective measures. The cap serves dual purposes: structural/aesthetic function and electrical protection function, simplifying the overall device.
3Reliability
If a plastic cap is used to ensure electrical protection, then the electrical protection is improved, but the aesthetic appearance deteriorates
Solution Approach 1:
The cap is segmented into a metallic outer portion for aesthetics and an insulating inner portion for electrical protection, allowing plastic material to be used without compromising appearance.
Solution Approach 2:
The cap uses composite construction with metallic exterior and insulating interior, combining the aesthetic benefits of metal with the protective benefits of plastic/insulating materials.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively protects the sensor electrode from electrostatic interference, enhances detection sensitivity and reliability, and offers a cost-effective, aesthetically appealing design by using a looped conductor and a conductive cap, allowing for reliable capacitive detection without the need for additional insulation or complex mounting.
Implementation Method 1
The underlying detection principle is based on a change in capacitance between the sensor electrode and a reference potential caused by the object
Implementation Method 2
The sensor electrode of the sensor arrangement can be operated by means of an associated control unit in order to measure a change in capacitance caused by the object on the basis of a sensor field emanating from the sensor electrode
Data Source
Figure 1
Figure 2a~2b
AI summary
A sensor arrangement for the capacitive detection of an object comprises a carrier, an electrically conductive cap associated with the carrier, and an electrically insulated conductor which extends at least partially in a loop shape between the cap and the carrier and is provided with a connection for a control unit.