Touch Sensing Module Using Resonance to Replace Mechanical Switches
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Solution Overview
Problem
Conventional mechanical switches in wearable devices occupy significant space, are not aesthetically pleasing, and pose risks due to exposed electrical components, making them difficult to integrate with dustproof and waterproof designs.
Innovation Solution
A touch sensing module incorporating a sensing coil, a metal portion, and a pad with capacitance that varies upon touch, forming a resonance circuit to detect touch inputs, allowing for inductive and capacitive sensing, thus eliminating the need for mechanical switches and enhancing design integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional mechanical switch is used, then a switching function is achieved, but the device occupies significant space and has a protruding structure
Solution Approach 1:
The patent replaces the conventional mechanical switch with a touch sensing module that uses capacitive sensing technology. The mechanical switching mechanism is substituted with an electronic sensing system comprising a sensing coil, metal portion, and pad that detects touch through capacitance changes, eliminating the need for mechanical moving parts and reducing space requirements.
Solution Approach 2:
The patent creates a functional copy of the mechanical switch using electromagnetic and capacitive fields. The touch sensing module replicates the switching function through electrical signal detection rather than mechanical contact, maintaining the essential functionality while achieving a compact, flush-mounted design.
2Reliability
If a conventional mechanical switch is used, then a switching function is achieved, but the design is not neat and aesthetic
Solution Approach 1:
The mechanical switch structure is replaced with a flat, integrated touch sensing module that can be flush-mounted within the device housing. The sensing components (sensing coil, metal portion, pad) are arranged in a compact configuration that maintains a sleek, modern aesthetic while providing reliable touch detection functionality.
3Reliability
If a conventional mechanical switch is used, then a switching function is achieved, but electrical shock risk increases due to direct contact
Solution Approach 1:
The patent eliminates direct electrical contact by using capacitive sensing technology. The touch detection is achieved through changes in capacitance caused by the proximity or contact of a conductive object (such as a finger), without requiring direct electrical connection. This non-contact sensing mechanism significantly reduces the risk of electrical shock while maintaining switching functionality.
4Reliability
If a conventional mechanical switch is used, then a switching function is achieved, but dustproofing and waterproofing become difficult
Solution Approach 1:
The patent replaces the mechanical switch with a sealed touch sensing module that has no moving parts or gaps requiring sealing. The sensing components are enclosed within a protective structure that maintains IP65 or higher protection ratings, preventing dust and water ingress while enabling touch functionality through the sealed surface.
5Shape
If a touch sensing module is used to eliminate mechanical switches, then design integration and safety are improved, but the complexity of the sensing mechanism increases
Solution Approach 1:
The touch sensing module is designed to perform multiple functions using a single integrated structure. The sensing coil, metal portion, and pad work together as a unified system that provides both capacitive sensing and structural support, reducing the need for separate components and simplifying the overall device architecture despite the advanced sensing capabilities.
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 touch sensing module enables efficient detection of touch inputs, including position and pressure, while providing a compact, aesthetically pleasing, and safe solution that integrates seamlessly with dustproof and waterproof designs.
Implementation Method 1
a sensing coil... configured to generate a resonance signal having a resonant frequency configured to vary as a touch is applied
Implementation Method 2
a pad having capacitance configured to vary as a touch is applied
Implementation Method 3
the sensing coil and the pad may be electrically connected to each other to form a resonance circuit, and the resonance circuit may generate a resonance signal having a resonant frequency configured to vary as a touch is applied
Data Source
AI summary
A touch sensing module includes a sensing coil, a metal portion disposed to be spaced apart from the sensing coil, and a first bracket having one surface, on which the metal portion is disposed, and an other surface, opposing the one surface, on which a pad having a capacitance, configured to vary as a touch is applied, is disposed.