Contact Detection for Variable Thickness Writing Media
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Solution Overview
Problem
Existing methods for detecting contact or non-contact between a writing utensil tip and a writing medium of variable thickness are inadequate, particularly when the medium deforms, as they require electronic devices or fixed contact thresholds, limiting their effectiveness with passive media like notebooks.
Innovation Solution
A method involving determining the tip's position and distance from a support surface, updating minimum distance values, and analyzing motion parameters to differentiate between contact and non-contact states, using a sliding window for precision and adapting to surface changes, allowing for passive utensil use with variable thickness media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure sensor is used for contact detection, then contact state can be detected, but the writing utensil requires electronic devices and electrical power sources
Solution Approach 1:
The patent replaces electronic pressure sensors with a magnetic field-based detection system. A magnetic sensor detects the position of a magnetic element attached to the writing utensil tip, and contact state is determined by analyzing position changes over time. This eliminates the need for electronic devices and power sources in the writing utensil itself.
2Device complexity
If a fixed contact threshold is used, then contact detection is simplified, but errors in tip position estimation and surface deformation cannot be compensated
Solution Approach 1:
The patent transitions from a static fixed threshold to a dynamic detection method that continuously updates the minimum distance value based on real-time position data. The system adapts to surface deformation by updating the reference plane and compensating for tip position estimation errors through temporal analysis of motion parameters.
Solution Approach 2:
The system uses feedback from continuous position measurements to update the minimum distance threshold and adjust detection parameters. By analyzing the relationship between current and historical position data, the system dynamically adjusts its detection criteria to maintain accuracy despite surface variations.
3Measurement precision
If submillimeter estimation error is required for fixed threshold method, then contact detection accuracy improves, but the method becomes ineffective when writing surface deforms
Solution Approach 1:
The system performs preliminary actions by continuously tracking and storing position data before contact events occur. It builds a historical record of tip positions and uses this information to establish dynamic reference levels, enabling accurate contact detection even when surfaces deform during writing.
Data Source
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AI summary
The invention relates to a method for continuously detecting a contact state or non-contact state between a tip (P) of an instrument (U) and a writing surface (SE) of a writing medium (SUE) which has a variable thickness and is arranged on a bearing surface (SA) of a tracking device (DL).