Haptic Pen Input Control for Realistic Multi-Pen Writing Feel
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Solution Overview
Problem
Existing electronic handwriting input systems struggle to accurately simulate the tactile sensation of writing with different types of pens, such as ballpoint pens, marker pens, felt-tip pens, mechanical pencils, and fountain pens, by generating vibrations that mimic the feel of actual writing.
Innovation Solution
A pen-type input device equipped with a vibration actuator, a pen category selection processor, and a control processor that adjusts vibration intensity based on the selected pen category and writing velocity, simulating the unique tactile sensations of various pens by generating specific vibration waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration waveforms are generated based on pen tip properties (thickness, hardness, smoothness, elasticity), then the system can store and reproduce vibration data, but it cannot accurately present the tactile sensation of actual writing
Solution Approach 1:
The patent changes the parameters of vibration intensity based on writing velocity and pen category. The control processor adjusts vibration intensity dynamically - increasing it by a first degree for pens where vibration increases with velocity, by a second degree for pens where vibration increases less with velocity, and keeping it constant for pens where vibration remains unchanged. This parameter adjustment resolves the contradiction by making the vibration feedback adapt to different pen characteristics and writing speeds, accurately reproducing the tactile sensation of actual writing.
Solution Approach 2:
The patent introduces dynamic adjustment of vibration intensity based on real-time writing velocity detection. Instead of using fixed vibration waveforms, the system continuously adapts the vibration feedback according to the detected writing velocity and selected pen category. This dynamic approach enables accurate tactile sensation reproduction across different writing conditions, resolving the limitation of static vibration waveform generation.
2Adaptability or versatility
If a single vibration waveform is used for all pen types, then the device structure remains simple, but the tactile feedback cannot differentiate between various pen categories
Solution Approach 1:
The patent segments the vibration control into different categories based on pen type. The pen category selection processor divides pens into multiple groups (first pen category, second pen category, etc.), and the control processor applies different vibration intensity adjustment strategies to each category. This segmentation enables the system to differentiate between various pen types while maintaining a relatively simple overall structure, as each category follows a predetermined vibration adjustment pattern.
Solution Approach 2:
The vibration actuator serves multiple functions by producing different vibration intensities for different pen categories and writing velocities. Instead of requiring separate actuators for each pen type, the single vibration actuator is controlled to simulate the tactile characteristics of various pens through programmed intensity adjustments. This multi-functionality resolves the contradiction by enabling pen category differentiation without proportionally increasing device complexity.
3Measurement precision
If vibration intensity is increased significantly to enhance tactile feedback, then the writing sensation becomes more pronounced, but it may become overwhelming and unnatural for certain pen types
Solution Approach 1:
The patent carefully adjusts the vibration intensity parameter based on pen category and writing velocity. For pens where vibration naturally increases with velocity (first pen category), the system increases intensity by a first degree. For pens where vibration increases less with velocity (second pen category), it increases by a smaller second degree. For pens with constant vibration (third pen category), it maintains constant intensity. This nuanced parameter adjustment ensures tactile feedback remains natural and appropriate for each pen type, avoiding overwhelming sensations.
Solution Approach 2:
The system uses writing velocity detection as feedback to dynamically adjust vibration intensity. The detection processor monitors writing velocity in real-time, and the control processor uses this feedback to modulate the vibration actuator accordingly. This feedback mechanism ensures that vibration intensity remains proportional to actual writing conditions, preventing unnatural or overwhelming sensations while maintaining accurate tactile feedback.
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 device effectively replicates the writing feel of different pens by adjusting vibration intensity and frequency, providing a more immersive and accurate tactile feedback experience.
Implementation Method 1
a vibration actuator accommodated inside the pen body... drive control of the vibration actuator based on the first vibration waveform corresponding to the first pen category or the second vibration waveform corresponding to the second pen category
Data Source
AI summary
A pen-type input device includes: a pen body; a vibration actuator accommodated inside the pen body; a pen category selection processor configured to select a first pen category or a second pen category; a storage configured to store a first and a second vibration waveform, the first vibration waveform corresponding to the first pen category, and the second vibration waveform corresponding to the second pen category; a control processor configured to perform drive control of the vibration actuator based on the first vibration waveform corresponding to the first pen category or the second vibration waveform corresponding to the second pen category, the first pen category or the second pen category being selected by the pen category selection processor; and a writing-velocity detection processor configured to detect a writing velocity of the pen body.