Stylus Pen Haptic Vibration Using Spring-Mass-Damper Response
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Solution Overview
Problem
Existing stylus pens incorporating vibration systems fail to provide a realistic tactile experience that mimics the sensation of writing with a pen due to vibrations that do not accurately replicate the writing process.
Innovation Solution
A stylus pen and input system that utilize a vibrator driven by a controller to generate drive signals based on the impulse response of a spring-mass-damper system, replicating the vibrations of writing through a mechanical model of the pen and user's hand, incorporating a gyrosensor and writing-pressure sensor to adjust vibration patterns in response to writing speed and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration motor is driven by large unit waves with alternating low and high amplitude regions, then the vibration system can produce vibrations in the stylus pen, but the tactile experience does not feel like real writing
Solution Approach 1:
The patent changes the vibration waveform parameters from large unit waves with alternating amplitude regions to waveforms that follow the impulse response of a spring-mass-damper system. This parameter transformation makes the vibration characteristics match real writing sensations, resolving the contradiction between producing vibration and providing realistic tactile feedback.
Solution Approach 2:
The patent copies the vibration characteristics of real writing by modeling the pen-hand system as a spring-mass-damper system and using its impulse response as the drive waveform. This copying approach enables the stylus to reproduce authentic writing vibrations, improving tactile realism while maintaining operational accuracy.
2Productivity
If the vibration motor is driven to mimic writing vibrations, then vibration patterns can be produced, but the vibrations do not accurately replicate the writing process
Solution Approach 1:
The patent replaces the simple mechanical vibration motor control with a physics-based model (spring-mass-damper system) that accurately represents the writing process. This substitution maintains vibration generation efficiency while dramatically improving the accuracy of writing vibration replication through proper mechanical modeling.
3Stability of the object's composition
If existing vibration systems drive the vibration motor based on predetermined patterns, then consistent vibration output is achieved, but the system cannot adapt to actual writing conditions
Solution Approach 1:
The patent incorporates sensors that detect actual writing conditions and uses this feedback to adjust the vibration motor drive signal in real-time. This feedback mechanism maintains stable vibration output while enabling adaptation to varying writing conditions, resolving the contradiction between consistency and responsiveness.
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 system provides a realistic tactile experience by accurately mimicking the sensations of writing, enhancing user interaction and feedback.
Implementation Method 1
The controller is configured to generate the drive signal such that the vibrator, when driven by the drive signal, causes the pen part to vibrate based on an impulse response of a spring-mass-damper system
Data Source
AI summary
A stylus pen includes: a pen part; a vibrator provided in the pen part; and a controller configured to generate a drive signal for driving the vibrator. The controller is configured to generate the drive signal such that the vibrator, when driven by the drive signal, causes the pen part to vibrate based on an impulse response of a spring-mass-damper system.