Composite Magnetic Core for Shock-Resistant Digitizer Position Indicators
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Solution Overview
Problem
Existing position indicators for digitizers are prone to damage from impacts due to the fragility of their magnetic cores, which are often reinforced with buffer materials increasing the diameter and component count, making them unsuitable for compact mobile devices.
Innovation Solution
A magnetic core composed of soft magnetic metal powder mixed with a resin binder, manufactured using injection compression molding to enhance shock resistance and reduce diameter, eliminating the need for a buffer material and allowing a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a magnetic core is made from soft magnetic molded metal product, then the position indicator can be manufactured, but the magnetic core becomes fragile against impact
Solution Approach 1:
The patent applies composite materials by combining soft magnetic metal powder with a resin binder to create a magnetic core that integrates both magnetic functionality and mechanical shock resistance. The resin binder acts as a shock-absorbing matrix that protects the fragile metal powder particles while maintaining the necessary magnetic properties for position indicator operation.
2Reliability
If buffer material is provided around the resonant coil and core, then the magnetic core is protected from impact, but the number of components and diameter of the magnetic core increase
Solution Approach 1:
The patent merges the buffer material function directly into the magnetic core structure by forming the core from a composite of soft magnetic metal powder and resin binder. This integration eliminates the need for separate buffer materials surrounding the core, reducing both component count and overall diameter while maintaining impact protection.
3Reliability
If buffer material is provided around the resonant coil and core, then the magnetic core is protected from impact, but the diameter of the magnetic core increases
Solution Approach 1:
The buffer function is merged into the magnetic core material itself, allowing the core to maintain a compact diameter without requiring additional external buffer materials. The resin binder within the composite structure provides shock absorption internally, eliminating the need for increased diameter.
4Length of moving object
If the position indicator is made thin and compact, then it can be housed in compact mobile information terminals, but the strength of the material decreases and the indicator may bend or break under impact
Solution Approach 1:
The patent uses composite materials consisting of soft magnetic metal powder dispersed in a resin binder to create a magnetic core that is both thin and mechanically robust. The resin matrix provides structural strength and shock absorption, enabling the position indicator to maintain adequate strength even at reduced thickness for compact device integration.
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 a compact position indicator with improved shock resistance, minimizing the risk of magnetic core damage and enabling a thinner, more robust design suitable for compact mobile devices without additional buffer materials.
Implementation Method 1
a magnetic core formed of a composition including a soft magnetic metal powder mixed with a resin binder... having a high shock resistance when the indicator is impacted
Implementation Method 2
The resonant coil is configured to be excited based on the alternating field received from the digitizer and to generate the response to the alternating field
Data Source
AI summary
A position indicator for use with a digitizer is provided. The position indicator generates a response to an alternating field received from the digitizer. The position indicator includes a core formed of a composition including a soft magnetic metal powder mixed with a resin binder, and at least one coil provided around the core configured to generate the response to the alternating field based on the alternating field received from the digitizer.