Audio Transducer Diaphragm Segmented Skin Support Structure
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Solution Overview
Problem
Audio transducer diaphragms face a trade-off between stiffness and mass, as materials that combine both are expensive and difficult to process, making it challenging to achieve optimal performance with minimal mass and maximum stiffness.
Innovation Solution
A diaphragm design featuring a support structure with higher density than the skin, which enhances rigidity while allowing the skin to be made of a low-density material, potentially formed using expansion molding to create a solid cellular structure, and incorporating a honeycomb structure for additional stiffness and reduced mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a minimal amount of highly rigid material is used to form the diaphragm, then the mass is reduced, but the stiffness becomes insufficient
Solution Approach 1:
The diaphragm is segmented into two distinct components: a low-density skin layer and a high-density support structure. The skin (made of material like polypropylene or polyethylene) provides the outer surface and acoustic properties, while the support structure (made of higher density material) is embedded within or attached to the skin to provide the necessary stiffness and rigidity. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between mass reduction and stiffness maintenance.
Solution Approach 2:
The diaphragm employs a composite structure combining two materials with different density and stiffness characteristics. The low-density material (skin) minimizes mass, while the high-density material (support structure) maximizes stiffness. This composite approach enables the diaphragm to achieve both low mass and high stiffness simultaneously, directly resolving the technical contradiction.
2Strength
If materials combining stiffness and low density are used, then performance is optimized, but manufacturing difficulty and cost increase
Solution Approach 1:
By dividing the diaphragm into a skin and a support structure made from commonly available materials, the invention avoids the need to source and process rare or specialized low-density high-stiffness materials. Each component can be manufactured using standard processes, and then assembled together, significantly reducing manufacturing complexity and cost while achieving the desired stiffness-to-mass ratio.
Solution Approach 2:
The support structure is integrated with the skin through various joining methods (adhesive bonding, mechanical interlocking, or co-molding), creating a unified diaphragm component. This merging of two separately manufactured parts into a single functional unit simplifies the overall manufacturing process compared to working with complex single-material composites, while maintaining the optimized stiffness-to-mass performance.
Data Source
AI summary
A diaphragm for an audio transducer includes a first outer surface, a second outer surface opposing the first outer surface and a support structure. A skin defines at least one of the first and second outer surfaces of the diaphragm. The support structure is disposed on or within the skin.