Strain Gauge Sensors for Force-Sensitive Interface Context Detection
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Solution Overview
Problem
Current electronic devices lack effective mechanisms for receiving force- or pressure-dependent user inputs, such as swipe, tap, and squeeze gestures, and do not adjust input mechanisms based on external contexts or environments.
Innovation Solution
The implementation of a force-sensitive interface using strain gauge sensors disposed at the inner surface of an electronic device's housing, which detects strain and converts it into meaningful parameter values to determine user inputs and external contexts, allowing for various user actions based on the detected forces and locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical buttons protrude from the exterior surface, then user input reception is reliable, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent replaces protruding mechanical buttons with strain gauge sensors embedded in the housing. The strain gauges detect force applied to the housing surface and convert it to electrical signals, eliminating the need for mechanical button structures while maintaining input reception capability. This substitution reduces device complexity and manufacturing difficulty.
Solution Approach 2:
The patent merges the button function with the housing structure itself. The housing serves dual purposes: structural protection and input detection surface. The strain gauges are integrated into the housing, combining the detection mechanism with the existing structural component, thereby reducing overall device complexity.
2Ease of operation
If mechanical buttons are used, then user input detection is straightforward, but power consumption increases
Solution Approach 1:
The patent replaces power-consuming mechanical button actuators with strain gauge sensors that detect force through resistance changes. The strain gauges passively convert mechanical strain to electrical signals without requiring additional power for actuation, significantly reducing power consumption while maintaining ease of input detection.
Solution Approach 2:
The strain gauge sensors utilize the physical property of resistance change under strain to generate detection signals. The housing structure itself serves as the detection surface, and the strain gauges automatically convert mechanical deformation to electrical signals without requiring external power for the detection mechanism, enabling self-service operation.
3Measurement precision
If multiple sensors are distributed at edges, then detection precision improves, but device complexity increases
Solution Approach 1:
The patent divides the detection function across multiple strain gauge sensors positioned at different edges of the housing. Each sensor independently detects force at its location, and the system integrates signals from multiple sensors to determine overall device context. This segmentation improves detection precision by providing distributed measurement points while using simple strain gauge elements.
Solution Approach 2:
The strain gauge sensors serve multiple functions: detecting force magnitude, determining force location, and inferring device context (hand holding, carrying conditions). This multi-functionality allows a single sensor type to provide comprehensive detection capabilities, improving measurement precision without proportionally increasing device complexity.
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
Enables a wide range of force-dependent user inputs and detects external contexts like device orientation and carrying conditions, reducing power consumption and utilizing fewer circuit components compared to mechanical button interfaces.
Implementation Method 1
multiple strain gauge sensors to enable receipt of user input. The strain gauge sensors may each be disposed at or adjacent an inner surface of a housing of the device
Data Source
AI summary
A method includes a processor of an electronic device receiving first input signals from a first sensor in response to user contact at a first edge of the device and second input signals from a second sensor in response to user contact at a second edge of the electronic device. The first and second sensors are covered by a housing of the device. The processor determines an external context of the device based on analysis of the first input signals and the second input signals. The determined external context indicates at least a position of the device relative to a user or an orientation of the device relative to a user. Responsive to determining the external context, the electronic device executes a particular user input action.