Hexaferrite Nanofiber Magnetic Sheet for Speaker Weight Reduction
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Solution Overview
Problem
Current magnetic materials face challenges in down-sizing and weight reduction while maintaining excellent magnetic characteristics, particularly in electronic devices where size and weight reduction are crucial.
Innovation Solution
A magnetic sheet is developed using hexaferrite magnetic material particles dispersed in a nanofiber matrix, with a silane-based coupling material to enhance bonding, allowing for improved magnetic properties and mechanical reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional magnetic materials are used, then magnetic characteristics are maintained, but size and weight reduction is limited
Solution Approach 1:
The patent uses a composite structure consisting of hexaferrite magnetic material particles dispersed in a nanofiber matrix. This composite approach allows the magnetic particles to provide magnetic functionality while the nanofiber matrix provides structural support, enabling weight reduction without sacrificing magnetic characteristics or reliability.
Solution Approach 2:
The patent changes the physical and chemical parameters of the magnetic material by using hexaferrite particles with specific size ranges (0.1-10 μm) and specific chemical compositions (M-type or W-type hexaferrite). These parameter changes enable the material to achieve both weight reduction and maintained magnetic performance.
2Volume of moving object
If magnetic material is down-sized, then weight reduction is achieved, but magnetic characteristics deteriorate
Solution Approach 1:
The patent optimizes the size parameter of magnetic particles to 0.1-10 μm, which is large enough to maintain strong magnetic characteristics but small enough to achieve down-sizing. The chemical composition parameters are also optimized by selecting specific hexaferrite types with high magnetic performance.
Solution Approach 2:
The patent creates local quality variations by dispersing magnetic particles non-uniformly within the nanofiber matrix, concentrating magnetic properties in specific regions where needed while maintaining overall compact structure. This allows volume reduction without compromising magnetic functionality.
3Volume of moving object
If nanofiber matrix is used, then size and weight are reduced, but bonding strength between particles and matrix decreases
Solution Approach 1:
The patent introduces a coupling material as an intermediary substance between the hexaferrite magnetic particles and the nanofiber matrix. This coupling material improves the interfacial bonding and adhesion between the two phases, preventing particle detachment while maintaining the compact nanofiber structure.
Solution Approach 2:
The patent creates a three-phase composite system consisting of magnetic particles, coupling material, and nanofiber matrix. This multi-phase composite structure enhances the overall bonding strength by providing multiple interfaces for mechanical interlocking and chemical bonding, while maintaining the lightweight and compact characteristics.
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 magnetic sheet achieves excellent magnetic characteristics, reduced size, and low weight, enabling effective down-sizing and weight reduction in electronic devices, such as speakers, while maintaining reliability under physical impact.
Implementation Method 1
A coupling material adhering the magnetic material particle to the nanofiber may be further included. The coupling material may be a silane-based compound including a hydrophilic group
Implementation Method 2
a magnetic sheet including a magnetic material particle having a hexaferrite
Data Source
AI summary
A magnetic sheet having a magnetic material particle comprising a hexaferrite and a nanofiber matrix made of two or more nanofibers, wherein the magnetic material particle is dispersed in the nanofiber matrix. A manufacturing method thereof and a speaker including the magnetic sheet are also provided.