Winged Bracket Strain Gauge for Compact Stylus Pressure Sensing
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Solution Overview
Problem
Physical space constraints within a stylus housing make it difficult to incorporate a pressure sensor without interfering with other components, necessitating a space-efficient design for pressure sensing.
Innovation Solution
Incorporation of a winged bracket within the stylus housing that flexes in response to pressure, coupled with a strain gauge to measure strain along the bracket, enabling pressure measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is incorporated into the stylus housing, then pressure measurement capability is improved, but device complexity and space utilization are worsened
Solution Approach 1:
The patent combines the pressure sensing function with the existing stylus structure by integrating a strain gauge directly onto the bracket that is already part of the stylus assembly. This merging approach eliminates the need for a separate pressure sensor component, thereby improving pressure measurement capability while avoiding increased device complexity
Solution Approach 2:
The bracket in the stylus is designed to serve multiple functions: it provides structural support for the stylus tip assembly and simultaneously acts as the sensing element for pressure measurement through the integrated strain gauge. This multi-functionality resolves the contradiction by enabling pressure measurement without adding dedicated pressure sensing components that would increase device complexity
2Measurement precision
If a pressure sensor is incorporated into the stylus housing, then pressure measurement capability is improved, but the available space for other components is reduced
Solution Approach 1:
The pressure sensing function is merged with the existing bracket structure, eliminating the need for separate pressure sensor housing and associated mounting space. The strain gauge is applied directly to the bracket surface, utilizing existing structural space rather than consuming additional volume within the stylus housing
Solution Approach 2:
The invention extracts the pressure sensing function from traditional separate pressure sensor components and implements it through the strain gauge on the bracket. This extraction approach removes the need for dedicated pressure sensor packaging and mounting infrastructure, thereby preserving available space for other stylus components
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 pressure sensing within the stylus while conserving physical space, allowing for precise measurement of applied pressure.
Implementation Method 1
A winged bracket mounted within the elongate housing and affixed to a tip-distal end of the stylus tip assembly is configured to flex in response to pressure applied to the stylus tip assembly
Implementation Method 2
A strain gauge disposed along the winged bracket is configured to measure strain along the winged bracket caused by pressure applied to the tip assembly
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
An active stylus includes a stylus tip assembly and an elongate housing enclosing a portion of the stylus tip assembly. A winged bracket mounted within the elongate housing and affixed to a tip-distal end of the stylus tip assembly is configured to flex in response to pressure applied to the stylus tip assembly. A strain gauge disposed along the winged bracket is configured to measure strain along the winged bracket caused by pressure applied to the tip assembly.