Dual Inductive Touch Sensor Assembly for Adjacent Button Deflection
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Solution Overview
Problem
Existing touch sensing technologies in mobile devices struggle to accurately differentiate between local and non-localized deflections on touch surfaces, leading to potential false button presses when dual touch buttons are integrated into a sidewall, as they fail to effectively sense the distinct deformation patterns of adjacent buttons.
Innovation Solution
The implementation of a back-side inductive touch sensing apparatus with dual touch sensor assemblies, each comprising a support structure, a mounting structure, and a sense inductor coil, which allows for precise detection of local deflection of one touch button without triggering a false press on an adjacent button by maintaining a defined sensing gap and using spacer elements, snap-in structures, and copper vias for accurate deflection measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual touch sensor assemblies are integrated into a sidewall with close spacing, then the device can detect both XY position and Z-force for multiple buttons, but it becomes difficult to differentiate between local deflection of one button and non-localized deflection affecting adjacent buttons
Solution Approach 1:
The touch surface is divided into separate touch button areas (first touch button area and second touch button area), each with its own dedicated touch sensor assembly. This segmentation allows each sensor to independently monitor deflection at its specific location, enabling the system to distinguish between local deflection at one button and non-localized deflection affecting the overall structure.
2Area of stationary object
If touch sensor assemblies are mounted close to each other on the back-side of the surface, then space is efficiently utilized, but the sensing accuracy for adjacent buttons deteriorates due to cross-interference in deflection detection
Solution Approach 1:
Each touch sensor assembly is configured with specific local properties including a sense inductor coil with defined geometric characteristics (such as elliptical shape with major and minor axes) and specific mounting parameters (such as spacing of 0.5mm to 2.0mm from the touch surface). These localized optimizations enable each sensor to maintain high detection accuracy for its specific button area while coexisting with adjacent sensors in the limited sidewall 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 solution enables reliable and accurate detection of touch button presses on mobile devices by distinguishing between local and non-localized deflections, reducing false activation and enhancing user input precision.
Implementation Method 1
a sense inductor coil disposed on one of the support structure and the mounting structure
Data Source
AI summary
A touch sensing apparatus for dual (adjacent) touch buttons (areas) defined on a touch surface (such as a sidewall of a mobile communications device). The apparatus includes first and second touch sensor assemblies, each including a support structure, a mounting structure to mount the touch sensor assembly to the back-side of the surface, and a sense inductor coil disposed on one of the support structure and the mounting structure. The first touch sensor assembly mounted to the back-side of the surface opposite the first touch area. The second touch sensor assembly mounted to the back-side of the surface opposite the second touch area. The touch sensor assembly can be constructed with the sense inductor coil disposed on the support structure, such that deflection of the respective touch area causes the touch surface to deflect toward the sense inductor coil, or with the sense inductor coil is disposed on the mounting structure, such that deflection of the respective touch area causes the touch surface and the sense coil inductor to deflect toward the support structure.