Magnetic Conductive Pen Tip Structure for Accurate EMR Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electromagnetic pens suffer from suboptimal electromagnetic induction performance due to structural constraints, resulting in a gap between the inductance component and the pen tip, which limits accuracy and user experience.
Innovation Solution
An electromagnetic pen with a front end featuring a magnetic conductive shell made of soft magnetic material, comprising a large and small round table with a hollow structure, injection-molded for ergonomic design and improved magnetic field distribution, enhancing the proximity of the coil to the pen tip and incorporating a variable inductance component and LC resonant circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inductance component is placed as close as possible to the pen tip, then the electromagnetic induction performance is improved, but the front end housing structure constraints prevent the inductance from being unlimitedly close to the pen tip, resulting in a 2-3 mm gap
Solution Approach 1:
A magnetic conductive shell is introduced as an intermediary component between the coil and the pen tip. This shell concentrates and guides magnetic field lines, enabling effective electromagnetic induction even when the coil is positioned 2-3 mm away from the tip, thus resolving the conflict between structural constraints and induction accuracy.
Solution Approach 2:
The magnetic conductive shell changes the magnetic field distribution parameters by concentrating field lines toward the pen tip. This parameter modification allows the system to achieve better electromagnetic induction performance without requiring the coil to be positioned immediately at the tip, overcoming the structural limitation.
2Measurement precision
If the front end of the pen is designed to be too thick to accommodate the inductor, then the inductor can be positioned closer to the tip, but this deteriorates the pen-holding experience and ergonomics
Solution Approach 1:
The magnetic conductive shell serves as a mediator that enables effective electromagnetic induction with a thin front end design. By concentrating magnetic field lines, it allows the coil to be positioned further from the tip while maintaining induction accuracy, thus preserving ergonomic pen design and comfortable holding experience.
3Ease of manufacture
If there is a 2-3 mm gap between the inductance and the pen tip due to structural constraints, then the manufacturing process is simplified, but the electromagnetic induction performance becomes average and cannot sense pen tip displacement accurately
Solution Approach 1:
The magnetic conductive shell is positioned at the front end with the pen tip protruding from it, serving as a mediator that concentrates magnetic field lines toward the tip. This allows the coil to be positioned 2-3 mm away from the tip without compromising electromagnetic induction performance, thus maintaining both manufacturing simplicity and sensing accuracy.
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
This design enhances electromagnetic induction accuracy and user experience by reducing the magnetic conduction distance, improving the magnetic field characteristics, and providing a better ergonomic shape with precise processing control.
Implementation Method 1
a front end of the pen housing is provided with a front magnetic conductive shell, and the front magnetic conductive shell is made of magnetic conductive material
Implementation Method 2
The electromagnetic pen uses the principle of electromagnetic induction to sense the movement trajectory of the pen tip
Data Source
AI summary
An electromagnetic pen with a front end having magnetic conductivity, comprising a pen housing, an inductance component, and a PCB board, the inductance component and the PCB board are arranged in the pen housing and the inductance component is electrically connected to the PCB board. The front end of the pen housing is provided with a front magnetic conductive shell, the front magnetic conductive shell is made of magnetic conductive material, wherein a coil is arranged in the front magnetic conductive shell, and the coil is electrically connected to the PCB board. A front end of a pen core protrudes from the front magnetic conductive shell, and the front magnetic conductive shell makes the distribution of the magnetic field lines closer to the pen tip, which can meet the magnetic conductivity conditions in electromagnetic induction and improve the characteristics of the magnetic field lines of the inclination angle.