Force-Measuring Device Assembly with Segmented Sense Regions
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Solution Overview
Problem
Existing force-measuring devices in portable electronic apparatuses face challenges in configuring virtual buttons due to varying data from strain-sensing elements based on force-imparting points, necessitating a modification of the sense region span to enhance accuracy and prevent cross-talk between adjacent regions.
Innovation Solution
A force-measuring device assembly with a mid-frame featuring a base portion, sidewall portion, and transition region, where the sidewall portion and transition region are elongate along a longitudinal axis, and each force-measuring device is coupled to the inner surface at a contact region, with elongate slits or troughs in the transition region to define separate sense regions, allowing for precise strain-sensing and reduced cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain-sensing elements are used to detect force at different locations, then force measurement capability is provided, but data varies markedly depending on force-imparting points making accurate sensing difficult
Solution Approach 1:
The sidewall portion is divided into multiple discrete sense regions, with each region containing one or more contact regions. Each sense region is associated with a specific force-measuring device, creating spatially separated measurement zones that prevent cross-talk and ensure consistent data within each region.
Solution Approach 2:
Each sense region is designed with specific local characteristics including contact regions positioned at optimal locations for force detection. The transition region includes elongate slits or troughs that create distinct mechanical properties in different zones, allowing each sense region to have optimized local quality for its specific measurement function.
2Adaptability or versatility
If multiple force-measuring devices are arranged along the sidewall, then comprehensive force detection is achieved, but cross-talk between adjacent regions occurs
Solution Approach 1:
The transition region incorporates elongate slits or troughs that physically segment the structure into distinct sense regions. These slits act as mechanical separators that prevent force transmission between adjacent force-measuring devices, eliminating cross-talk while maintaining comprehensive detection coverage along the sidewall.
Solution Approach 2:
The elongate slits or troughs in the transition region serve as intermediary elements between adjacent force-measuring devices. These features act as mechanical isolators that block the transmission of force signals between neighboring sensors, preventing cross-talk while allowing each sensor to independently detect forces in its designated sense region.
3Area of stationary object
If the sense region span is extended to cover more area, then detection coverage is improved, but cross-talk between adjacent regions increases
Solution Approach 1:
The sidewall portion is segmented into multiple sense regions along its length, with each region having a defined span that balances coverage and isolation. The elongate slits extend along the longitudinal axis to create visual and mechanical separation between regions, allowing each sense region to maintain adequate coverage while preventing cross-talk through the slit barriers.
4Ease of operation
If virtual buttons are configured in narrow side portions, then device usability is improved, but force measurement accuracy deteriorates due to varying strain-sensing data
Solution Approach 1:
Each sense region in the narrow side portions is designed with optimized local characteristics, including strategically positioned contact regions and elongate slits that create favorable mechanical conditions for force detection. This local optimization ensures accurate force measurement for virtual buttons even in the constrained geometry of narrow sidewalls.
Solution Approach 2:
The narrow side portions are divided into distinct sense regions with clear boundaries defined by elongate slits. This segmentation isolates each virtual button's force sensing zone, ensuring that forces applied to different virtual buttons are measured independently without cross-contamination, thereby maintaining high measurement precision in the limited space.
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 configuration enables accurate strain-sensing and reduces cross-talk between adjacent sense regions, allowing for effective implementation of virtual buttons in portable electronic devices by modifying the span of the sense region, thereby improving the accuracy and functionality of force-measuring devices.
Implementation Method 1
Each of the force-measuring devices includes at least one strain-sensing element configured to output voltage signals in accordance with a time-varying strain at each respective strain-sensing element
Data Source
AI summary
A force-measuring device (FMD) assembly for a portable electronic apparatus includes a mid-frame including a base portion, a sidewall portion, and a transition region between the base portion and the sidewall portion, and force-measuring devices coupled to the inner surface of the sidewall portion. The sidewall portion and the transition region are elongate along a longitudinal axis. FMDs are coupled to the inner surface at respective contact regions of the sidewall portion and are separated from each other along the longitudinal axis. Each of the FMDs includes strain-sensing element(s). Each of the FMDs corresponds to a respective sense region of the sidewall portion. The transition region includes a respective elongate slit or trough for each of the sense regions. The respective elongate slit or trough is elongate along the longitudinal axis. Adjacent elongate slits or troughs are separated by a respective rib.