Capacitive Touch Switch Air-Layer Structure for Stable Detection
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Solution Overview
Problem
Conventional electrostatic capacitance-type switching devices experience unstable touch detection due to unintended minute gaps generated between the circuit board and laminated body components under external stress, such as strong pressure, leading to inconsistent performance.
Innovation Solution
Incorporating an air layer between the circuit board and the laminated body, specifically between the electrode and the holding member, to maintain a consistent electrostatic capacitance change rate and prevent unstable touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the laminated body is attached to the circuit board with strong pressure or external stress, then the attachment strength is improved, but unintended minute gaps are generated between the circuit board and laminated body members, causing unstable touch detection
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the circuit board and the touch panel member. This resin layer fills the unintended minute gaps that form under external stress, maintaining continuous electrical contact and stable electrostatic capacitance detection while allowing strong attachment pressure.
Solution Approach 2:
The electrical properties of the gap region are changed by filling it with resin material having specific dielectric characteristics. This parameter change maintains stable electrostatic capacitance values even when physical gaps form due to attachment pressure or thermal expansion, preventing touch detection instability.
2Stability of the object's composition
If the circuit board and laminated body are tightly bonded, then structural stability is improved, but minute gaps still form under external stress, affecting electrostatic capacitance detection
Solution Approach 1:
The resin layer serves as a compensatory intermediary that accommodates minor dimensional variations and gap formations while maintaining stable electrical properties. It bridges the circuit board and touch panel member, ensuring consistent electrostatic capacitance detection despite structural movements under external stress.
Solution Approach 2:
A composite structure is formed by combining the circuit board, resin layer, and touch panel member. The resin material provides both mechanical bonding and electrical insulation properties, creating a composite assembly that maintains stability while accommodating stress-induced deformations without forming harmful gaps.
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 air layer ensures stable touch detection by reducing the change rate of electrostatic capacitance, maintaining performance even when the panel body and circuit board are strained, thereby preventing erroneous inputs and ensuring reliable operation.
Implementation Method 1
an electrode which detects change in electrostatic capacitance that is caused by a touch operation of a user
Data Source
AI summary
A switching device according to an embodiment includes a circuit board, a laminated body, and an air layer. The circuit board is provided with an electrode which detects change in electrostatic capacitance that is caused by a touch operation of a user. The laminated body is laminated on the circuit board, and includes a touch panel member that receives the touch operation. The air layer is arranged at a position that corresponds to the electrode between the circuit board and the laminated body.