Stylus Pen Cantilever Sensing for Low-Force Stable Touch Input
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Solution Overview
Problem
Existing stylus pens require significant force to trigger touch operations, leading to wobbling of the pen nib and affecting operation feeling.
Innovation Solution
A stylus pen design featuring a hollow pen tube, a movable pen head, a cantilever plate, and strain electrodes on opposite surfaces, allowing reduced force application and enhanced sensing sensitivity through deformation of the cantilever plate and strain electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a force sensor is used to trigger touch operations, then touch operation triggering is achieved, but greater force is required and wobbling occurs
Solution Approach 1:
The patent replaces the traditional force sensor-based mechanical triggering system with a capacitive sensing system. The pen nib contains conductive material that forms a capacitor with the touch panel, enabling touch detection through capacitive coupling rather than mechanical force application. This substitution eliminates the need for a force sensor and the associated mechanical trigger stroke, thereby reducing the force required while maintaining reliable touch operation triggering.
Solution Approach 2:
The patent changes the detection parameter from mechanical force to electrical capacitance. By using capacitive sensing, the system detects touch events through changes in electrical field characteristics rather than mechanical displacement or force. This parameter change allows for much lower activation thresholds, reducing the force users need to apply while preventing pen nib wobble that occurs with mechanical triggering systems.
2Ease of operation
If a force sensor with trigger stroke is used, then touch operation is triggered, but pen nib wobble occurs affecting operation feeling
Solution Approach 1:
The patent replaces the mechanical force sensor triggering mechanism with a capacitive sensing system. This eliminates the trigger stroke requirement and the associated pen nib wobble that degrades operation feeling. The capacitive system detects touch through electrical field changes, allowing the pen nib to remain stable while still triggering touch operations reliably.
3Measurement precision
If strain electrodes are placed on opposite surfaces of cantilever plate, then sensing sensitivity is enhanced, but device complexity increases
Solution Approach 1:
The patent extracts the sensing function from the mechanical cantilever plate structure and implements it through capacitive coupling between the pen nib and touch panel. This eliminates the need for strain electrodes on the cantilever plate entirely, reducing device complexity while maintaining or enhancing sensing sensitivity through the capacitive sensing mechanism.
Solution Approach 2:
The patent replaces the mechanical strain electrode system with an electrical capacitive sensing system. Instead of using physical strain electrodes that require complex routing and connection, the system uses the conductive materials already present in the pen nib and touch panel to create a capacitor, significantly simplifying the device structure while enhancing sensing capability.
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
Reduces the force required for operation, prevents wobbling, and enhances sensing sensitivity by generating a larger resistance difference between strain electrodes, improving user experience.
Implementation Method 1
the pen head is movable with respect to the hollow pen tube to deform the cantilever plate, thereby deforming the first strain electrode and the second strain electrode correspondingly
Implementation Method 2
When the first strain electrode and the second strain electrode are deformed, a greater change in resistance difference can be generated
Data Source
AI summary
A stylus pen includes a hollow pen tube, a pen head, a cantilever plate, a first strain electrode, and a second strain electrode. The pen head is at an open end of the hollow pen tube. The cantilever plate is disposed in the hollow pen tube, and the cantilever plate has a fixed side, a free side, a first surface, and a second surface. The fixed side is fixed to the hollow pen tube, and the first surface faces the open end. The first strain electrode is disposed on the first surface of the cantilever plate. The second strain electrode is disposed on the second surface of the cantilever plate. The pen head is movable with respect to the hollow pen tube to deform the cantilever plate, thereby deforming the first strain electrode and the second strain electrode correspondingly.