Stylus Pressure Sensor Miniaturization via Centralized Wiring
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Solution Overview
Problem
The existing pressure sensing devices in styluses face challenges in miniaturization due to feeder wiring and connection terminals arranged on the outer circumference, which hinder further downsizing for detecting pen pressure and tilt.
Innovation Solution
A pressure sensing device housed in a pen-shaped stylus with a plate-shaped member, strain sensitive materials, and a connection electrode crimped to the circuit, allowing for efficient detection of force applied to the tip portion, enabling miniaturization while maintaining electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If feeder wiring and connection terminals are arranged on the outer circumference of the pressure sensing device, then electrical connectivity is ensured, but the device size increases and miniaturization is hindered
Solution Approach 1:
The patent merges the feeder wiring and connection terminals into the center portion of the pressure sensing device. By combining these components into a single integrated region, the device eliminates the need for peripheral wiring arrangements, thereby reducing the overall device footprint and enabling miniaturization of the stylus while maintaining electrical connectivity.
Solution Approach 2:
The patent transitions from a peripheral arrangement of feeder wiring and connection terminals to a central arrangement. This dimensional reorganization allows the wiring and terminals to be positioned in the center portion of the device, optimizing space utilization and enabling compact stylus design without compromising electrical connections.
2Measurement precision
If strain sensitive materials are positioned closer to the center portion, then detection sensitivity is improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by positioning strain sensitive materials specifically in the center portion of the pressure sensing device where strain generation is most effective. This localized arrangement optimizes detection sensitivity for force components in three-axis directions while maintaining a relatively simple overall device structure through targeted material placement rather than complex distributed arrangements.
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
The solution enables the detection of force components in three-axis directions with high sensitivity, facilitating the miniaturization of the stylus while maintaining effective strain detection and electrical connectivity.
Implementation Method 1
The strain gauge uses a phenomenon that the electrical resistance of a strain sensitive material is changed by strain (not only elastic strain, but also plastic strain) of the strain sensitive material.
Data Source
AI summary
There is provided a pressure sensing device including a plate-shaped member, plural strain sensitive materials arranged on the plate-shaped member, and a connection electrode electrically connected to a predetermined circuit. The plate-shaped member includes a surface portion having a center portion that receives force applied to a tip portion of a stylus. The plural strain sensitive materials include first and second strain sensitive materials arranged at different distances from the center portion of the surface portion of the plate-shaped member. The plural strain sensitive materials are formed on at least one surface portion of the plate-shaped member along with a conductive pattern that connects the first and second strain sensitive materials. The connection electrode is electrically connected to the plural strain sensitive materials, and the connection electrode is crimped and electrically connected to the predetermined circuit housed in the stylus.