Inductive Force Sensing for Sealed Wearable Switch Input
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Solution Overview
Problem
Existing mechanical switches in wearable devices require significant space, are prone to electric shocks, and face challenges in implementing dustproof and waterproof functions, limiting their design and functionality.
Innovation Solution
A touch sensing device within the device's housing uses a sensing coil and sensing circuit to detect changes in inductance due to external pressure, generating an operating signal based on force measurement values and reference values, allowing for a more compact and safe design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical switch is used, then a switch function can be implemented, but a large size and space are required internally
Solution Approach 1:
The patent replaces the mechanical switch system with a touch sensing device that detects touch inputs through capacitive or resistive sensing mechanisms. This substitution eliminates the need for mechanical moving parts, thereby reducing internal space requirements while maintaining the switch function. The sensing device can be integrated into the display panel or housing, allowing for a more compact device structure.
Solution Approach 2:
The patent extracts the switching function from a dedicated mechanical component and integrates it into the touch panel or housing structure. By taking out the separate mechanical switch and embedding the sensing capability directly into the existing structure, the device achieves space savings while preserving input functionality.
2Reliability
If a mechanical switch is used, then a switch function can be implemented, but the structure protrudes externally or does not integrate with an external case
Solution Approach 1:
The patent merges the switch function with the touch panel or housing structure, creating an integrated design where the input mechanism is seamlessly combined with the external case. This merging eliminates protruding elements and achieves a smooth, unified appearance while maintaining full switching functionality through touch or force sensing.
Solution Approach 2:
The patent implements a multi-functional touch panel that serves both as the display interface and as the input mechanism. The same structural element (touch panel or housing) performs multiple functions: displaying information and detecting user inputs, thereby eliminating the need for separate protruding switch components and achieving better design integration.
3Reliability
If a mechanical switch is used, then a switch function can be implemented, but there is a risk of electric shocks due to direct contact
Solution Approach 1:
The patent introduces an intermediary layer (the touch panel surface) between the user and the internal circuitry. This intermediary allows for contactless or non-conductive interaction, where the user's touch is detected through capacitive coupling or resistive contact without direct electrical connection, thereby eliminating the risk of electric shock while maintaining switch functionality.
4Reliability
If a mechanical switch is used, then a switch function can be implemented, but implementing dustproof and waterproof functions may be difficult
Solution Approach 1:
The patent combines the switch function with the sealed touch panel or housing structure, eliminating separate openings or gaps that would compromise dustproof and waterproof sealing. The integrated design allows the entire front surface to maintain its protective seal while still enabling touch input detection, significantly simplifying the implementation of environmental protection features.
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
This solution enables a compact, safe, and efficient way to detect force inputs without the need for physical buttons, improving design and functionality while ensuring dustproof and waterproof capabilities.
Implementation Method 1
deriving a force measurement value based on a change in inductance of a touch sensing device disposed inside a housing of the electronic device and configured to change inductance by external pressure applied to a touch switching unit of the housing
Data Source
AI summary
A method of generating an operating signal of an electronic device includes: deriving a force measurement value based on a change in inductance of a touch sensing device disposed inside a housing of the electronic device and configured to change inductance by external pressure applied to a touch switching unit of the housing; accumulatively recording the force measurement value derived in the deriving of the force measurement value; setting a reference value based on the recorded force measurement value, in response to the force measurement value being accumulatively recorded until a unit condition is satisfied; and generating an operating signal based on a high and low relationship between the force measurement value derived from the change in inductance occurring after the setting of the reference value, and the set reference value.