Laminated Loudspeaker Diaphragm with High-Modulus Papermaking Layer
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Solution Overview
Problem
Conventional loudspeaker diaphragms fail to achieve a wide range of reproduction frequencies with low distortion and high rigidity, which are essential for modern electronic devices that require excellent sound quality.
Innovation Solution
A diaphragm structure comprising a paper base layer made from natural fibers and thermoplastic resin, combined with a papermaking layer containing fibers with a high tensile elastic modulus, which is formed by a papermaking process to enhance elastic modulus and reduce weight, resulting in improved sound pressure levels and increased high-band limit frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a diaphragm is made with natural fibers and mica using a papermaking process, then the diaphragm achieves high rigidity, but the elastic modulus is insufficient and sound quality is not optimized
Solution Approach 1:
The patent uses a composite structure combining natural fibers (for lightweight properties) with high-tensile-modulus fibers (for rigidity) in a laminated configuration. This composite approach allows the diaphragm to achieve both high rigidity and optimized sound quality by leveraging the complementary properties of different fiber materials.
Solution Approach 2:
The diaphragm is divided into multiple layers: a natural fiber base layer providing lightweight structure and a papermaking layer containing high-tensile-modulus fibers providing rigidity. This segmentation allows each layer to perform its specific function optimally, resolving the contradiction between rigidity and sound quality.
2Weight of moving object
If the diaphragm uses only natural fibers, then the structure is lightweight and environmentally friendly, but the elastic modulus is insufficient for wide frequency reproduction
Solution Approach 1:
The patent combines lightweight natural fibers with high-tensile-modulus fibers in a laminated structure. The natural fibers maintain the lightweight and environmentally friendly characteristics, while the high-tensile-modulus fibers (with elastic modulus of 150 GPa or greater) provide the necessary rigidity for wide frequency reproduction, including high-frequency range.
3Reliability
If the diaphragm increases its rigidity to improve high-frequency response, then the high-band limit frequency increases, but the overall weight increases
Solution Approach 1:
The patent applies high-tensile-modulus fibers specifically in the papermaking layer that contacts the voice coil, where rigidity is most needed for high-frequency response. The natural fiber base layer maintains lightweight properties. This localized application of rigidity-enhancing materials achieves high-band limit frequency improvement without unnecessarily increasing overall diaphragm weight.
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 structured diaphragm achieves enhanced sound quality by increasing the transmission efficiency of vibrations and suppressing distortion, particularly in the mid-to-high frequency ranges, while being lightweight and environmentally friendly.
Implementation Method 1
a papermaking layer laminated on the paper base layer
Implementation Method 2
The paper base layer contains natural fibers and thermoplastic resin
Data Source
AI summary
The diaphragm has a paper base layer and a papermaking layer. The papermaking layer is formed on a surface of the paper base layer. The paper base layer contains natural fibers and thermoplastic resin, and is formed by a papermaking process with a mixture of the natural fibers and the resin. The papermaking layer, contains fibers each having a tensile elastic modulus of 150 GPa or greater, and is formed by a papermaking process with the fibers.