Magnetic-Potential Loudspeaker Diaphragm Rigidity and Driving Force
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Solution Overview
Problem
Traditional magnetic-potential transducers face limitations in driving force and displacement due to the strength and tightness of their movable members, which are made of lighter iron-based alloys, leading to insufficient performance in sound generation.
Innovation Solution
A magnetic-potential loudspeaker design that incorporates a magnetic conductive material arranged in an area where an alternating magnetic field overlaps with a static magnetic field, driven by a suspension device with an elastic recovery mechanism and a rigidity adjusting portion to enhance the structural integrity and displacement of the diaphragm, allowing for improved driving force and electrical-mechanical conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a magnetic conductive material with smaller volume is used as the driving element, then the vibration mass becomes lighter, but the strength and tightness of the movable member are insufficient
Solution Approach 1:
The patent applies composite materials by combining the magnetic conductive material (for light weight) with a rigidity adjusting portion made of different materials having appropriate rigidity and strength. This composite structure allows the movable member to maintain both light weight and sufficient strength/tightness, resolving the contradiction between lightweight design and structural integrity.
Solution Approach 2:
The rigidity adjusting portion is strategically positioned at specific locations on the movable member where additional strength is needed. This local reinforcement approach maintains overall light weight while providing targeted strength enhancement in critical areas, resolving the contradiction between lightweight design and structural integrity.
2Power
If the movable member moves in translation, then the driving volume increases, but the strength and tightness limitations become more critical
Solution Approach 1:
The composite structure of magnetic conductive material combined with rigidity adjusting portion enables the movable member to achieve both translation motion capability (high driving volume) and sufficient strength/tightness. The rigidity adjusting portion provides the necessary structural support for translation motion while maintaining light weight.
3Strength
If copper-based alloy with density greater than 8.9 is used for the coil, then the strength is maintained, but the density is high
Solution Approach 1:
The patent changes the material parameter (density) of the coil from traditional copper-based alloy (density > 8.9) to aluminum-containing copper wire with lower density. This parameter change reduces the weight of the coil while maintaining acceptable strength through optimized wire composition and 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 significantly improves the driving force and electrical-mechanical conversion efficiency, particularly in high-frequency ranges, while simplifying the magnetic circuit structure and allowing for flexible material selection, resulting in enhanced reliability and assembly robustness.
Implementation Method 1
at least a part of the magnetic conductive material is arranged in an area where an alternating magnetic field overlaps with a static magnetic field, so that the static magnetic field and the alternating magnetic field are converged; a magnetic field force generated by an interaction between the static magnetic field and the alternating magnetic field is applied to the magnetic conductive material so as to drive the movable sound generating device to move
Implementation Method 2
the suspension device includes an elastic recovery device for providing a restoring force for a reciprocal vibration of the movable sound generating device
Data Source
AI summary
Disclosed are a magnetic-potential loudspeaker and an electronic device using the same. The magnetic-potential loudspeaker comprises: a movable sound generating device provided with a magnetic conductive material, wherein at least a part of the magnetic conductive material is arranged in an area where an alternating magnetic field overlaps with a static magnetic field, a magnetic field force generated by an interaction between the static magnetic field and the alternating magnetic field is applied to the magnetic conductive material, the movable sound generating device further comprises a diaphragm and a rigidity adjusting portion arranged on at least one surface of the diaphragm; and at least one suspension device, wherein the suspension device comprises an elastic recovery device, an inner fixing portion of the elastic recovery device is fixed to the diaphragm, an outer fixing portion thereof is fixed to an inside of the magnetic-potential loudspeaker, and the rigidity adjusting portion.