Metal-Plate Capacitive Touch Switch With Insulated Sensor Coupling
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Solution Overview
Problem
Conventional capacitive touch switches lack user-friendly operator control due to their non-metallic surfaces, which can lead to discomfort and inaccuracies in operation, especially under temperature changes and component aging.
Innovation Solution
A capacitive touch switch design featuring a metal plate sensor area with a non-conductive insulating body between the metal plate and the capacitive sensor element, providing a pleasant metal touch experience and using illuminated insulating elements to indicate the sensor area and switching state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a non-metallic surface is used for the sensor area, then the capacitive touch switch can be manufactured with simpler materials, but the user experience deteriorates due to lack of pleasant metal touch feeling
Solution Approach 1:
The patent applies composite materials by combining a metal plate (providing pleasant touch sensation) with a non-conductive insulating body (providing dielectric function). This composite structure allows the sensor area to have both the desirable metal touch feeling and the required electrical insulation properties, resolving the contradiction between manufacturing simplicity and user experience.
2Ease of operation
If a metal plate is used for the sensor area, then the user experience improves with pleasant metal touch feeling, but the dielectric function deteriorates because metal is conductive
Solution Approach 1:
The patent segments the sensor area into two distinct functional parts: a metal plate for providing pleasant touch sensation and a non-conductive insulating body for providing dielectric function. This segmentation allows each component to perform its specific function optimally, resolving the contradiction between user experience and dielectric reliability.
Solution Approach 2:
The non-conductive insulating body acts as an intermediary between the metal plate and the capacitive sensor element. It mediates the contradiction by allowing the metal plate to provide touch sensation while the insulating body ensures the required dielectric function, preventing direct electrical contact between the conductive metal and the sensor element.
3Device complexity
If the panel components are positioned without compensation, then the device complexity is reduced, but the reliability deteriorates due to temperature changes and aging processes
Solution Approach 1:
The patent applies dynamics by using a compression spring instead of a rigid positioning structure. The spring provides dynamic adjustment capability, automatically compensating for dimensional changes caused by temperature variations and aging processes. This dynamic solution maintains reliable contact without requiring complex positioning mechanisms, resolving the contradiction between device complexity and contact reliability.
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
Enhances user experience with a metal-like touch and improved operational accuracy by ensuring reliable contact and clear indication of the sensor area and switching state, regardless of temperature fluctuations or component tolerances.
Implementation Method 1
an insulating body is disposed between the plate and the capacitive sensor element
Implementation Method 2
a capacitive sensor element together with the finger of a user, through a touch panel acting as a dielectric, forms a capacitance which is variable depending on operation of the touch switch
Data Source
AI summary
A capacitive touch switch for an operator control panel of an electrical domestic appliance includes a panel, a sensor area disposed in the panel, a printed circuit board disposed at a distance behind the panel, and a capacitive sensor element which is disposed between the panel and the printed circuit board, is in electrically conductive contact with the printed circuit board and is associated with the sensor area in the panel at a distance from the sensor area. The sensor area is formed by a plate of metal material, and a non-conductive insulating body is disposed between the plate and the capacitive sensor element.