Loudspeaker Edge Diameter Asymmetry for Harmonic Distortion
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Solution Overview
Problem
Conventional loudspeakers face challenges in perfectly equalizing the amplitudes of the diaphragm, leading to incomplete suppression of harmonic distortion due to the difference in edge diameters of the first and second edges, which affects power linearity and sound reproducibility.
Innovation Solution
The loudspeaker design sets the edge diameter of the second edge coupled to the suspension holder larger than that of the first edge coupled to the diaphragm, reducing the compliance difference and thereby minimizing harmonic distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer diameter of second edge is made smaller to fit in frame, then the compliance difference between first and second edges increases, but harmonic distortion suppression becomes incomplete
Solution Approach 1:
The patent applies asymmetry by intentionally making the second edge have a larger outer diameter than the first edge, reversing the conventional symmetric design. This asymmetric configuration compensates for the compliance difference caused by the suspension holder attachment, allowing both edges to have equal compliance despite their different structural roles, thereby achieving complete harmonic distortion suppression
Solution Approach 2:
The patent changes the geometric parameter (outer diameter) of the second edge to be larger than that of the first edge. This parameter modification adjusts the compliance characteristics of the second edge to match the first edge, resolving the compliance imbalance that prevents perfect harmonic distortion suppression in conventional designs
2Reliability
If the edge diameters are equalized, then power linearity improves, but the structural asymmetry required for suspension holder attachment cannot be satisfied
Solution Approach 1:
The patent resolves this contradiction by introducing controlled asymmetry in the outer diameters of the first and second edges. The second edge is designed with a larger outer diameter to accommodate the suspension holder while maintaining equal compliance with the first edge, achieving both structural functionality and power linearity
Solution Approach 2:
The patent applies local quality by differentiating the outer diameters of the first and second edges based on their specific functional requirements. The second edge has a larger diameter locally where the suspension holder attaches, while both edges maintain equal compliance characteristics, satisfying both structural and performance requirements
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
This configuration effectively reduces harmonic distortion, particularly in the low-frequency range, improving sound reproducibility and allowing for a more compact loudspeaker design by suppressing the rolling of the voice coil unit.
Implementation Method 1
voice coil unit 2 that is slidably disposed on magnetic circuit 1
Data Source
AI summary
A loudspeaker has a configuration in which edge diameter in the cross section of second edge coupled to suspension holder is set to be larger than edge diameter in the cross section of first edge coupled to diaphragm. With such a configuration, a loudspeaker with reduced harmonic distortion is provided.