Loudspeaker Membrane with Convex-Concave Intermediate Zone
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Solution Overview
Problem
Existing loudspeaker membranes face challenges with acoustic performance and require significant mounting space, leading to high total harmonic distortion and inflexible design, especially in micro speakers for small devices.
Innovation Solution
A membrane design with a central portion and intermediate portion featuring convex and concave sections, integrated into a clamping collar for mounting, which minimizes harmonic distortion and allows for flexible design by utilizing the convex sections as wire ducts and optimizing surface area distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the membrane uses a conventional design with uniform surface curvature, then the manufacturing is simpler, but the acoustic performance deteriorates with higher harmonic distortion
Solution Approach 1:
The membrane employs different surface curvatures in different regions: the central portion has a first surface curvature while the intermediate portion has a second surface curvature that is different from the first. This local differentiation optimizes acoustic performance by reducing total harmonic distortion through tailored vibration characteristics in each zone.
Solution Approach 2:
The membrane incorporates specific curvature configurations where the intermediate portion has a surface curvature that differs from the central portion. This curvature variation creates optimized vibration patterns that reduce harmonic distortion and enhance acoustic output.
2Reliability
If the membrane increases its surface area to improve acoustic output, then the acoustic performance improves, but the required mounting space increases
Solution Approach 1:
The membrane utilizes three-dimensional surface variations with convex and concave sections in the intermediate portion, effectively using vertical dimension to increase acoustic surface area without proportionally increasing the horizontal mounting footprint. This allows higher acoustic output within constrained spaces.
Solution Approach 2:
By incorporating convex and concave curved sections in the intermediate portion, the membrane creates additional vibration surface area that contributes to acoustic output while maintaining a compact overall footprint suitable for micro speaker applications.
3Strength
If the membrane uses protrusions or ridges to reinforce the intermediate portion, then the structural strength improves, but the acoustic performance deteriorates
Solution Approach 1:
The membrane has the clamping collar region with different surface curvature to provide structural support where needed, while maintaining different curvature characteristics in the intermediate portion to preserve acoustic performance. The support structure is localized to areas requiring strength without compromising vibration quality.
Data Source
AI summary
The invention relates to a new membrane for a loudspeaker. The membrane comprises a central portion having a sound emitting surface and a back surface. The membrane further comprises a first edge directly adjacent to the central portion and surrounding the central portion. The membrane further comprises a second edge surrounding the first edge and an intermediate portion located between the first edge and the second edge, wherein the intermediate portion comprises at least one convex shaped section with regard to the sound emitting surface area of the central portion and at least one concave shaped section with regard to the sound emitting surface area of the central portion.