Electrostatic Pen Tilt Detection via Signal Intensity
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Solution Overview
Problem
Existing position detecting devices with pen-shaped position indicators face issues of thickness, accuracy, and integration with touch detection, as thinning magnetic cores reduces resolution and increases breakage risk, and they struggle to support both pen and multi-touch inputs.
Innovation Solution
A position detecting device using electrostatic coupling between a tablet and a position indicator, which eliminates the need for coils in the indicator, employing a signal generator, electrodes, and a switch circuit to transmit pattern information for accurate rotation and tilt calculations, allowing for a thin, durable design compatible with both pen and multi-touch inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If magnetic cores are thinned to reduce pen thickness, then the pen profile becomes slimmer, but the distance between core centers shortens reducing resolution and accuracy
Solution Approach 1:
The patent replaces the electromagnetic induction system with magnetic cores and coils with an electrostatic induction system using capacitive sensors and electrodes. This substitution eliminates the need for thick magnetic cores while enabling accurate position and rotation detection through capacitive coupling, directly resolving the contradiction between pen thickness and measurement precision.
Solution Approach 2:
The patent changes the detection principle from electromagnetic induction to electrostatic induction, fundamentally altering the physical parameters of the system. By using capacitive sensors that detect changes in electrical field and capacitance values, the system achieves high precision rotation angle detection without requiring thick magnetic cores, thus resolving the technical contradiction.
2Length of moving object
If magnetic cores are thinned to reduce pen thickness, then the pen profile becomes slimmer, but the cores become more susceptible to breakage from shock
Solution Approach 1:
The patent replaces fragile magnetic cores with a lightweight plastic housing containing circuit boards and electronic components. This substitution eliminates the brittleness issue inherent in thin magnetic cores while maintaining the structural integrity needed to withstand shock and drops, directly resolving the contradiction between pen thickness and reliability.
3Measurement precision
If electromagnetic induction sensors with loop coils are used, then position indicator detection is achieved, but integration with multi-touch input detection becomes difficult
Solution Approach 1:
The patent implements a universal electrostatic induction sensor that serves multiple functions: detecting position indicators, enabling multi-touch input, and supporting various input methods. The capacitive sensor array can detect both the electrostatic field from a position indicator and simultaneous finger touches, allowing the system to handle both pen input and multi-touch input without requiring separate sensor systems, thus resolving the contradiction between position detection accuracy and multi-touch compatibility.
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 solution provides accurate and durable position detection with enhanced integration for both pen and touch inputs, maintaining high accuracy and resistance to shock, while enabling a slim profile and compatibility with electrostatic touch panel sensors.
Implementation Method 1
A position detecting device using electrostatic coupling between a tablet and a position indicator
Data Source
AI summary
A method is disclosed to detect a tilt angle of a pen-shaped position indicator relative to a sensor surface of a tablet. The position indicator includes a first pen electrode and a second pen electrode. The sensor surface includes X electrodes and Y electrodes that intersect each other. The position indicator transmits a first signal from the first pen electrode and a second signal from the second pen electrode. The tablet detects a first signal intensity level V1 of the first signal based on a highest signal level Vpx1 detected in one of the X electrodes in response to the first signal, and detects a second signal intensity level V2 of the second signal based on a highest signal level Vpx2 detected in one of the X electrodes in response to the second signal. The tablet determines a tilt angle of the pen-shaped position indicator relative to the sensor surface based on a difference between the first signal intensity level V1 and the second signal intensity level V2.