Loudspeaker Non-Uniform Suspension Stiffening Element
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Solution Overview
Problem
Non-uniform suspensions in loudspeakers cause flexing of the membrane, leading to undesired vibrations and sound distortion due to non-uniform forces acting on the membrane edge.
Innovation Solution
A loudspeaker design featuring a membrane with a non-uniform surround and a stiffening element at the outer edge, where the surround has different radial cross sections and a stiffening element is provided to counteract the flexure, increasing the assembly's stiffness and preventing membrane distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a non-uniform suspension is used, then the membrane area efficiency is improved, but the membrane stability deteriorates due to non-uniform forces causing flexing
Solution Approach 1:
The invention introduces a stiffening element with specifically designed local properties at the membrane edge to counteract the non-uniform forces generated by the non-uniform suspension. This local reinforcement provides additional stiffness precisely where needed to maintain membrane stability while preserving the benefits of the non-uniform suspension design.
Solution Approach 2:
The stiffening element is constructed as a composite structure comprising a first part and a second part with different cross-sectional properties. This composite design allows the element to provide enhanced stiffness at the membrane edge while adapting to the non-uniform force distribution, thereby resolving the contradiction between membrane area efficiency and stability.
2Ease of operation
If a non-uniform surround is used, then the membrane control is improved, but the sound quality deteriorates due to membrane flexing and vibrations
Solution Approach 1:
The stiffening element provides localized reinforcement at the membrane edge where it is most needed to prevent flexing and vibrations. This local quality enhancement allows the non-uniform surround to maintain its membrane control benefits while eliminating the harmful vibrations through targeted stiffness enhancement.
Solution Approach 2:
The stiffening element is designed to preemptively counteract the flexing forces generated by the non-uniform surround before they can cause membrane distortion and unwanted vibrations. By providing preliminary structural support, the element prevents the development of harmful vibrations while preserving the surround's control functionality.
Data Source
AI summary
A loudspeaker with a non-uniform surround, a membrane and a stiffening element preventing the surround from flexing the membrane during operation. A non-uniform surround does not have the same cross section, along the radius of the speaker if circular, all around the perimeter of the membrane as some portions will be upwardly directed and other portions downwardly directed.