Spring-Loaded Sensor Protection for Electronic Pen Robustness
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Solution Overview
Problem
Existing electronic pens are less robust than conventional pens due to delicate sensor technology, making them prone to damage from drops or mechanical overloading.
Innovation Solution
An electronic pen design incorporating a force transmission element, such as a pen refill, connected to a resilient means like a spring, which limits the pressure force on the force sensor to prevent overloading, using a stopping mechanism to absorb or dampen excessive forces, ensuring the sensor is protected from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic sensor technology is added to create an electronic pen, then the functionality and data processing capabilities are improved, but the mechanical robustness and resistance to damage from drops or overloading deteriorate
Solution Approach 1:
The patent implements a resilient means (spring element) that beforehand cushions and limits the force transmission to the sensor. This spring element is pre-configured to deform under excessive force, thereby protecting the sensor from damage before the damaging force can reach the sensor. The spring constant and pre-load are specifically designed to allow normal writing forces to pass through while absorbing impact forces from drops or accidental overloading.
2Measurement precision
If a force sensor is added to measure writing pressure force, then the measurement precision and writing sensitivity are improved, but the device complexity and susceptibility to mechanical damage increase
Solution Approach 1:
The patent introduces a force transmission element that acts as an intermediary between the writing tip and the force sensor. This intermediary includes a spring element that mediates the force transmission by providing a controlled mechanical interface. The spring element simplifies the overall system by providing a passive, reliable force transmission mechanism that reduces the complexity of force sensing while maintaining measurement precision through its predictable elastic properties.
3Speed
If the force transmission element is directly connected to the force sensor, then the responsiveness and sensitivity to writing pressure are improved, but the sensor becomes vulnerable to overloading and damage
Solution Approach 1:
The patent changes the mechanical parameters of the force transmission path by introducing a spring element with specific elastic properties. The spring constant is carefully selected to maintain fast response to normal writing pressure changes while providing sufficient resistance to prevent overloading. This parameter optimization allows the system to remain responsive to legitimate writing forces while automatically limiting the transmission of excessive forces that could damage the sensor.
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 design enhances the mechanical robustness and sensitivity of the electronic pen by limiting pressure force loads, protecting the force sensor from damage due to falls or improper use while maintaining effective writing functionality.
Implementation Method 1
at least one resilient means (102), in particular a spring element, which can be configured to be able to generate a force that opposes the pressure force acting on the at least one force sensor
Data Source
AI summary
An electronic pen comprising pen position recognition means, comprising at least one electrical voltage source, at least one digital control unit, a force transmission element, and at least one force sensor for measuring a writing pressure force, characterized in that the electronic pen comprises at least one resilient means, and the at least one resilient means being configured to generate a force that opposes the pressure force acting on the at least one force sensor. Also disclosed are methods for preventing overloading of a force sensor for measuring a writing pressure force for an electronic pen.