Flat Speaker Diaphragm with Foamed Polypropylene Core
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Solution Overview
Problem
Conventional speaker diaphragms with beehive-shaped middle layers are difficult to manufacture due to uneven surfaces, leading to high defect rates and increased costs, especially when made of aluminum, and result in acoustical distortion due to inadequate adhesive application and reduced elasticity.
Innovation Solution
A diaphragm arrangement featuring a middle foaming layer with flat surfaces sandwiched between two layers, made of foamed polypropylene, allowing for easy adhesive application and simplified manufacturing, reducing the complexity and cost of production while maintaining high quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a beehive-shaped middle layer is used in the diaphragm, then the diaphragm structure provides rigidity, but the uneven surfaces make adhesive application difficult and increase manufacturing complexity
Solution Approach 1:
The patent changes the surface geometry parameter of the middle layer from beehive-shaped (uneven) to flat surface, enabling uniform adhesive application while maintaining structural rigidity through the layered foam configuration
Solution Approach 2:
The patent uses a composite structure with a middle foam layer sandwiched between two outer layers, creating a composite material system that provides both rigidity and manufacturability
2Strength
If a beehive-shaped middle layer is used in the diaphragm, then the diaphragm structure provides rigidity, but the chambers formed reduce elasticity when filled with adhesive
Solution Approach 1:
The patent eliminates the chamber structure by using a flat middle layer, preventing adhesive infiltration into internal cavities and preserving the elastic properties of the diaphragm material
Solution Approach 2:
The patent employs a composite layered structure where the middle foam layer provides rigidity while the absence of internal chambers maintains the elasticity of the overall diaphragm assembly
3Manufacturing precision
If synthetic fiber is used for the middle layer to reduce defect rate, then the manufacturing defect rate decreases, but the manufacturing cost substantially increases
Solution Approach 1:
The patent changes the material parameter from expensive synthetic fiber to cost-effective foam material with flat surfaces, achieving low defect rates through simplified manufacturing while reducing material costs
Solution Approach 2:
The patent substitutes expensive synthetic fiber materials with cheaper foam materials that can be easily manufactured and discarded if defective, reducing overall manufacturing costs
4Strength
If a beehive-shaped middle layer is used in the diaphragm, then the diaphragm structure provides rigidity, but special equipment is required for attachment increasing device complexity
Solution Approach 1:
The patent changes the surface geometry from beehive-shaped to flat, eliminating the need for special attachment equipment and enabling standard manufacturing processes to be used
Data Source
AI summary
A diaphragm arrangement includes a middle foaming layer defining a first flat surface and an opposed flat surface, a first layer overlapped on the first flat surface of the middle foaming layer, and a second layer overlapped on the second flat surface of the middle foaming layer to form a flat speaker diaphragm which is arranged to mount at an opening of a supporting frame of a speaker.