Tapered Inductor Core Structure for Accurate Electronic Pen 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 design of their inductor cores, which can cause damage to surfaces and position detection devices, and lack flexibility in deformation to accommodate external forces.
Innovation Solution
The inductor core is designed with a tubular magnetic material body featuring an inclined portion with a tapered surface and a straight trunk portion, connected by a flange, allowing for increased flexibility and reduced deformation, thereby enhancing position detection accuracy and reducing the risk of damage to surfaces and devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inductor core is made with a rigid structure to maintain shape and stability, then the structural integrity is improved, but the ability to deform without damaging surfaces or devices deteriorates
Solution Approach 1:
The inductor core is divided into multiple sections: a tip portion, an inclined portion, and a straight trunk portion. Each section has different geometric characteristics that allow the core to deform in a controlled manner, absorbing external forces without transmitting them to the surface, thus preventing surface damage while maintaining overall structural integrity.
Solution Approach 2:
The cross-sectional area of the inductor core is designed to vary along its length, with the tip portion having a smaller area than the straight trunk portion. This parameter change creates a gradient structure that allows progressive deformation from the tip inward, enabling the core to yield under external force without causing surface damage.
2Ease of manufacture
If the inductor core is designed with uniform cross-section to simplify manufacturing, then the ease of manufacture is improved, but the position detection accuracy deteriorates
Solution Approach 1:
Different portions of the inductor core are designed with different cross-sectional areas to optimize local functions. The tip portion has a smaller cross-section for precise position detection and flexibility, while the straight trunk portion has a larger cross-section for structural support. This local differentiation improves position detection accuracy without significantly complicating the overall manufacturing process.
3Strength
If the inductor core has a larger cross-sectional area throughout to increase strength, then the mechanical strength is improved, but the flexibility to deform without damage deteriorates
Solution Approach 1:
The inductor core is segmented into a tip portion with smaller cross-sectional area and a straight trunk portion with larger cross-sectional area. This segmentation allows the core to exhibit both strength (from the larger trunk portion) and deformation flexibility (from the smaller tip portion), resolving the contradiction between mechanical strength and adaptability.
Solution Approach 2:
The cross-sectional area is optimized locally at different positions along the core. The tip portion has reduced area to provide flexibility and absorb external forces, while the trunk portion maintains larger area for structural strength. This local quality differentiation enables the core to simultaneously achieve both strength and deformation flexibility.
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 innovative design improves the accuracy of position detection, increases the reliability of the inductor core by allowing it to deform without damaging the core or the surface it contacts, and enhances the mechanical strength and fracture toughness of the inductor core.
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, including pores. The tubular magnetic material body includes an inclined portion including an inclined surface which constitutes a peripheral surface of a truncated cone; and a straight trunk portion which is disposed coaxially with the inclined portion, includes an outer peripheral surface which constitutes a peripheral surface of a cylindrical body, and is connected with the inclined portion. A difference between an average value of distances between centers of gravity of the pores in the inclined portion and an average diameter of the pores in the inclined portion, is smaller than a difference between an average value of distances between centers of gravity of the pores in the straight trunk portion and an average diameter of the pores in the straight trunk portion.