Flexible Circuit Board Force Sensor for Electronic Pen Pressure Detection
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Solution Overview
Problem
Traditional electronic drawing systems with force-sensing pens lack precise pressure detection, leading to inconsistent line thickness and quality in digital drawings.
Innovation Solution
Incorporating a flexible circuit board-based force sensor into the electronic pen, utilizing piezoresistive or piezocapacitive materials between metal pads to detect pressure applied to the pen tip, which generates a corresponding force signal related to the applied pressure, and coupling this signal to a control system for accurate line representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electronic drawing systems with basic force-sensing pens are used, then the device complexity is low, but the measurement precision of pressure detection is insufficient
Solution Approach 1:
The force sensor is segmented into distinct functional layers: a flexible circuit board with metal pads, a force-sensitive material layer, and a protective layer. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall measurement precision.
Solution Approach 2:
The patent uses a flexible circuit board as the substrate for the force sensor, which allows the sensor to be thin and adaptable to the pen's structure. The flexible nature of the circuit board enables precise force detection while keeping the overall device complexity manageable through integration.
2Measurement precision
If a flexible circuit board-based force sensor with piezoresistive or piezocapacitive materials is incorporated, then the measurement precision of pressure detection is improved, but the device complexity increases
Solution Approach 1:
The patent merges the circuit board function with the sensor function by integrating the force-sensitive material directly onto the flexible circuit board between the metal pads. This combination eliminates the need for separate sensing elements and reduces overall device complexity while maintaining high measurement precision.
Solution Approach 2:
The flexible circuit board serves multiple functions: it provides the structural substrate, contains the electrical circuitry, and supports the force-sensitive material. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while achieving precise pressure detection.
3Manufacturing precision
If traditional force-sensing mechanisms are used, then the device complexity is low, but the line thickness consistency and drawing quality are poor
Solution Approach 1:
The force sensor provides real-time feedback on the pressure applied to the pen tip. This feedback mechanism allows the electronic drawing system to dynamically adjust line thickness and drawing properties based on the detected force, ensuring consistent line quality and thickness control while maintaining a relatively simple sensor structure.
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 precise pressure detection, allowing for varying line thickness and quality in digital drawings, enhancing the overall drawing experience by accurately translating applied pressure into digital strokes.
Implementation Method 1
the force sensitive material 281 is selected from a group consisting of piezoresistive material and piezocapacitive material
Implementation Method 2
the force sensitive material 281 is selected from a group consisting of piezoresistive material and piezocapacitive material
Data Source
AI summary
A flexible circuit board based force sensor is disclosed. A flexible circuit having a first metal pad and a second metal pad, the flexible circuit board is folded so that the first metal pad functioning as a top metal pad and the bottom metal pad functioning as a bottom metal pad. A force sensing material is configured in between the top metal pad and the bottom metal pad to form a force sensor. An electronic drawing system adopts the flexible circuit board based force sensor in an electronic pen for sensing pressures applied against the pen tip of the electronic pen.