Dual-Frequency Coaxial Earphone Shared Magnet Design
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Solution Overview
Problem
Conventional earphones fail to distinguish between high and low acoustic frequencies due to intermodulation distortion, resulting in unclear sound and an impractical bulk size when trying to combine high and low-frequency speakers.
Innovation Solution
A dual-frequency coaxial earphone design with a shared magnet, featuring a housing, outer yoke, inner yoke, low-frequency speaker part, and high-frequency speaker part, where the shared annular magnet and yokes maintain specific polarities to separate and synchronize high and low-frequency signals, minimizing earphone dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-frequency speaker and a low-frequency speaker are arranged together in an earphone, then the sound quality is improved, but the bulk size increases making the earphone impractical
Solution Approach 1:
The patent combines high-frequency and low-frequency speaker functions into a single integrated earphone unit. The housing receives both speaker parts in an integrated arrangement, merging what would traditionally be separate components into one compact device that delivers both high and low frequency sound output simultaneously
Solution Approach 2:
The patent employs a nested configuration where the high-frequency speaker part is positioned within the housing in a space-efficient manner alongside the low-frequency speaker part. The crown portion and flange portion of the housing create nested spatial relationships that allow both speaker components to coexist in a compact volume
2Device complexity
If a single diaphragm is used for both high and low-frequency signals, then the device complexity is reduced, but intermodulation distortion occurs resulting in unclear sound
Solution Approach 1:
The patent segments the speaker system into distinct high-frequency and low-frequency speaker parts, each with its own voice coil and diaphragm. This segmentation allows independent optimization of each frequency range, preventing intermodulation distortion while maintaining manageable device complexity through modular design
Solution Approach 2:
The patent applies local quality by providing different diaphragms optimized for specific frequency ranges. The high-frequency diaphragm and low-frequency diaphragm have different characteristics suited to their respective frequency ranges, with each diaphragm receiving targeted acoustic signals through separate voice coils, ensuring optimal performance for each frequency band
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 effectively separates high and low-frequency acoustic waves, reducing intermodulation distortion and allowing for a compact earphone structure while maintaining clear sound quality.
Implementation Method 1
the voice coil 94 produces a magnetic field due to a magnetic effect. The magnetic field will then magnetically interact with the pole piece 95, making the diaphragm 92 vibrated and the acoustic frequency signal converted into and outputting an acoustic -frequency wave
Implementation Method 2
the shared annular magnet and yokes maintain specific polarities to separate and synchronize high and low-frequency signals
Data Source
AI summary
A dual-frequency coaxial earphone has a shared magnet, which is interposed between a top board of a outer yoke and an outer disk of a inner yoke, wherein the outer yoke and the inner yoke each has a different polarity. A low-frequency voice coil of a low-frequency speaker part extends axially into and between an annular wall of the outer yoke and the outer disk of the inner yoke. An inner sleeve of the inner yoke extends into a first central opening of the outer yoke. Therefore, a high frequency of the high-frequency speaker part can pass through the inner sleeve so as to energize a central diaphragm of the low-frequency speaker part and to form a same phase as, and to output frequency synchronously with, the low-frequency speaker part. As such, the problem of intermodulation of distortion for the high and low acoustic frequencies can be solved, and that dimension of the earphone can be minimized.