Inductor Core Surface Structure for Electronic Pen Coil Stability
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Solution Overview
Problem
The coil wound around the electronic pen's magnetic body core experiences unequal tension, leading to displacement and potential malfunction, particularly at the front tip side, due to the difference in skewness and friction coefficient.
Innovation Solution
The inductor core features a magnetic main body with an inclined portion and a straight body portion, where the skewness of the outer peripheral surface at the front tip side is reduced, and a flange portion is included to enhance stability and friction, minimizing displacement and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil is wound around the magnetic body core, then the electromagnetic inductive coupling is established, but the coil at the front tip side is more likely to be displaced from the original winding position due to reduced tension
Solution Approach 1:
The magnetic body is designed with different surface characteristics at different locations: the front tip portion has a rougher surface (higher Ra value) to increase friction and prevent coil displacement, while the base end portion has a smoother surface. This local differentiation of surface quality allows the front tip coil to be secured with higher friction without affecting the overall winding process
Solution Approach 2:
The rough surface is pre-formed on the front tip portion of the magnetic body before the coil winding process. This preliminary action ensures that when the coil is wound, the front tip portion already has enhanced friction characteristics that prevent displacement, addressing the tension issue before it arises during operation
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 the reliability of the inductor core and electronic pen by reducing coil displacement and malfunction, ensuring high mechanical strength and extended coil life.
Implementation Method 1
Position detection signals are exchanged between the position detection sensor and the electronic pen through a coupling method such as an electromagnetic inductive coupling method
Implementation Method 2
the front tip side of the outer peripheral surface has the reduced skewness Rsk. This makes the friction coefficient large at the front tip side
Data Source
AI summary
An inductor core includes a tubular shaped or pillar shaped magnetic main body comprising a magnetic material. The magnetic main body includes: an inclined portion including an inclined surface with an outer circumferential surface of a truncated cone having an outer diameter increasing from one end of the magnetic main body toward the other end; and a straight body portion that is coaxial with the inclined portion and extends from the other end toward the one end, the straight body portion being connected to the inclined portion and including an outer peripheral surface with an outer circumferential surface of a circle tubular body or a cylindrical column body. A skewness Rsk of an outer peripheral surface of the straight body portion located near the inclined portion is smaller than a skewness Rsk of an outer peripheral surface of the straight body portion located near the other end.