Dual-Magnetic Moving Iron Speaker for Thin Balanced Drive
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Solution Overview
Problem
Existing speakers in portable electronic devices face limitations in achieving thinness due to the height of the coil and magnet, leading to poor acoustic performance and single-ended drive with large amplitude attraction, resulting in a poor user experience.
Innovation Solution
A speaker design with a moving iron assembly system featuring dual magnetic structures at both ends of the housing, each with a movable iron unit and coil, allowing for balanced drive and magnetic flux control, and incorporating a magnetic conductive diaphragm and coils to enhance vibration and sound production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the coil and magnet are stacked with large amplitude driving requirements, then the driving force is improved, but the overall height of the speaker increases
Solution Approach 1:
The single coil-magnet assembly is segmented into two separate coil-magnet assemblies positioned at opposite ends of the housing. Each assembly independently drives its respective movable iron unit, eliminating the need for a tall stacked configuration while maintaining strong driving force through distributed magnetic structures.
Solution Approach 2:
The design transitions from a vertical stacking arrangement (height dimension) to a horizontal distribution arrangement (length dimension). The two magnetic structures are spaced apart horizontally within the housing, allowing the speaker to achieve thinness in the height direction while maintaining driving capability through the distributed horizontal configuration.
2Device complexity
If a single moving iron and moving iron assembly system is used, then the structure is simple, but the driving effect is poor with large amplitude attraction
Solution Approach 1:
The single moving iron assembly is divided into two separate movable iron units, each associated with its own magnetic structure and coil. This segmentation allows both units to be driven simultaneously in opposite directions, creating balanced dual-ended drive that eliminates the large amplitude attraction problems of single-ended drive while keeping the overall structure relatively simple.
3Force
If the magnets are staggered and placed on both sides of the coil, then the driving force is improved, but the overall height increases limiting thinness
Solution Approach 1:
The single coil with staggered magnets is segmented into two separate coil-magnet assemblies. Each assembly has its coil and magnets positioned at opposite ends of the housing, eliminating the need for vertical stacking or staggered placement that increases height. The magnetic structures are distributed horizontally, maintaining thinness while providing strong driving force.
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 achieves high driving force, balanced drive at both ends, and improved acoustic performance, providing a better user experience by optimizing the magnetic circuit and reducing the overall speaker thickness.
Implementation Method 1
a first coil and a second coil which are respectively spaced to surround the first movable iron unit and the second movable iron unit; the first coil being horizontally opposite to the second coil; A side of the first coil and a side of the second coil which are away from each other is respectively corresponding to the first magnetic structure and the second magnetic structure
Data Source
AI summary
The present invention provides a speaker including a housing and a moving iron assembly. The moving iron assembly includes a first magnetic structure and a second magnetic structure, a magnetic induction diaphragm that has a suspension, a first moving iron unit and a second moving iron unit located inside the suspension, and a first coil and a second coil. The side where the first coil and the second coil are away from each other respectively correspond to the first magnetic structure and the second magnetic structure. Compared with the prior art, the magnetic flux control of the moving iron assembly circuit of the speaker is strong, and the driving force is improved.