Loudspeaker Diaphragm Silk Fabric Thermoplastic Polyurethane Composite
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Solution Overview
Problem
Conventional loudspeaker diaphragms with single-layer structures fail to meet requirements for both rigidity and damping, particularly in high-frequency applications, as materials tend to compromise on either property.
Innovation Solution
A loudspeaker diaphragm comprising a dome portion and a suspension ring portion made from a combination of silk fabric and thermoplastic polyurethane, where the silk fabric is coated with a thermosetting adhesive and combined through hot pressing, allowing for superior rigidity and damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer material is used for the diaphragm, then the structure is simple, but it cannot satisfy both rigidity and damping characteristics
Solution Approach 1:
The patent applies composite materials by combining silk fabric and thermoplastic polyurethane in a multi-layer structure. The silk fabric provides rigidity while the thermoplastic polyurethane layer provides damping characteristics, resolving the contradiction between structural simplicity and acoustic performance requirements.
2Strength
If the diaphragm has greater rigidity, then the high-frequency response is improved, but the damping characteristic decreases
Solution Approach 1:
The patent applies local quality by assigning different functional characteristics to different layers of the composite structure. The silk fabric layer is optimized for rigidity to improve high-frequency response, while the thermoplastic polyurethane layer is optimized for damping characteristics, allowing each material to excel at its specific function rather than requiring a single material to balance both properties.
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
The combination of silk fabric and thermoplastic polyurethane with thermosetting adhesive enhances the acoustic performance of the diaphragm, particularly improving high-frequency response by balancing rigidity and damping.
Implementation Method 1
the silk fabric is coated with a thermosetting adhesive
Implementation Method 2
combining the silk fabric, which is coated with the adhesive in the step a, and the thermoplastic polyurethane through hot pressing
Implementation Method 3
both the thermosetting adhesive and the thermoplastic polyurethane in the membrane are in a molten state under the high temperature
Data Source
AI summary
A loudspeaker diaphragm, comprising a dome portion located at central position and a suspension ring portion located at edge position; the dome portion and/or the suspension ring portion comprise silk fabric and thermoplastic polyurethane combined with the silk fabric; and the silk fabric is coated with thermosetting adhesive. The method for manufacturing the loudspeaker diaphragm comprises following steps: a. coating the silk fabric with a thermosetting adhesive under a high temperature, and drying the silk fabric; b. hot pressing and combining the silk fabric and thermoplastic polyurethane to form a membrane; c. pressing the membrane to form the dome portion and/or the suspension ring portion. The dome portion, or both the dome portion and the suspension ring portion of the loudspeaker diaphragm comprise silk fabric coated with a thermosetting adhesive and thermoplastic polyurethane. Thus formed loudspeaker diaphragm has good rigidity and damping characteristic, thus improving acoustic performance of the diaphragm.