Electronic Pen Inductor Core Structure for Accurate Position Detection
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Solution Overview
Problem
Existing electronic pens for position detection in input devices face challenges in accuracy and reliability due to the tapered shape of the inductor core, which can lead to insufficient strength and potential deformation, as well as the risk of damaging the position detection device or the surface being contacted.
Innovation Solution
The inductor core is designed with a tubular magnetic material body featuring an inclined portion, a straight trunk portion, and a flange portion, providing increased rigidity and strength while reducing the risk of damage through a convex curved connection, and using a magnetic material with specific crystal grain size distribution and composition for enhanced fracture toughness and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inductor core is designed with a tapered shape, then the position detection accuracy is improved, but the strength and rigidity of the core deteriorates
Solution Approach 1:
The inductor core employs an asymmetric structure with a tapered portion that has a smaller outer diameter at one end and a larger outer diameter at the other end. This asymmetric geometry improves position detection accuracy by enabling better coupling with the position detection sensor, while the gradual transition maintains structural integrity compared to a sharply tapered design.
Solution Approach 2:
The core includes a flange portion positioned at the end with the larger outer diameter, which serves as a preliminary reinforcement structure. This flange portion increases the moment of inertia and provides structural support before the tapered section, preventing deformation and maintaining strength while still allowing the tapered portion to achieve accurate position detection.
2Measurement precision
If the inductor core is designed with a tapered shape, then the position detection accuracy is improved, but the reliability of the structure deteriorates
Solution Approach 1:
The asymmetric tapered design with a flange portion provides both improved position detection accuracy and enhanced structural reliability. The flange portion acts as a reinforcement that prevents deformation under operational stresses, ensuring reliable and durable performance while maintaining the accuracy benefits of the tapered geometry.
3Measurement precision
If the inductor core is designed with a tapered shape, then the position detection accuracy is improved, but the risk of damaging the position detection device increases
Solution Approach 1:
The flange portion at the base of the tapered section serves as a preliminary protective structure. By providing a larger outer diameter and increased structural rigidity at this location, the flange portion prevents the core from deforming or breaking during use, thereby eliminating the risk of damage to the position detection device while preserving the accuracy advantages of the tapered design.
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 design enhances the accuracy and reliability of position detection by maintaining core integrity and reducing the risk of damage to both the pen and the surface, while also improving the magnetic properties for effective electromagnetic induction.
Implementation Method 1
The detection between the position detection sensor and the electronic pen is enabled with the position detection device, through transmission and reception of a position detection signal by a coupling method such as an electromagnetic inductive coupling method
Data Source
AI summary
An inductor core includes a tubular magnetic material body formed of a magnetic material. The magnetic material body includes an inclined portion including an inclined surface which constitutes a peripheral surface of a truncated cone having an outer diameter that increases from one end toward the other end of the tubular magnetic material body; a straight trunk portion which is disposed coaxially with the inclined portion and includes an outer peripheral surface which constitutes a peripheral surface of a cylindrical body which extends from the other end toward the one end and a flange portion which is provided between the inclined portion and the straight trunk portion and connects the inclined portion and the straight trunk portion. An outer peripheral surface of the flange portion has an outer diameter greater than the outer diameter of the inclined portion and an outer diameter of the straight trunk portion.