Speaker Diaphragm Composite Structure for Sensitivity
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Solution Overview
Problem
Existing speaker diaphragms, particularly those made from high modulus plastic and silicone rubber, suffer from poor performance in terms of sound quality, requiring thicker diaphragms for adequate resonance, which leads to reduced space for vibration and increased weight, resulting in low sensitivity and poor listening experience.
Innovation Solution
A speaker diaphragm composed of two surface layers and at least one intermediate layer, with one surface layer being a thermoplastic polyester elastomer film layer and the intermediate layer an adhesive layer, offering a Young's modulus of 5-700 MPa and amplitude of 0.25 mm-1 mm, allowing for a thinner design while maintaining high stiffness and sensitivity, and featuring a copolymer structure of polyester and polyether or aliphatic polyester for enhanced resilience and damping properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diaphragms are made from silicone rubber to achieve waterproof and high sound quality, then sound quality is improved, but the diaphragm requires to be thicker which leads to reduced space allowance for vibration and heavy weight, resulting in low sensitivity
Solution Approach 1:
The patent uses a composite structure consisting of a base layer and a coating layer. The base layer provides structural support while the coating layer (made from materials with specific acoustic impedance and loss factor ranges) provides damping and acoustic optimization. This composite approach allows achieving good sound quality with a thinner overall diaphragm structure, thereby reducing weight while maintaining or improving acoustic performance.
Solution Approach 2:
The patent optimizes specific material parameters including acoustic impedance (1.5-3.0 MRayl) and loss factor (0.05-0.2) of the coating layer. By carefully selecting and controlling these parameters, the diaphragm achieves optimal acoustic performance with reduced thickness,ไป่ solving the contradiction between sound quality and weight.
2Strength
If diaphragms are made from high modulus plastic base layers to achieve structural strength, then strength is improved, but the diaphragms are poor in overall performance and likely to cause poor listening effect
Solution Approach 1:
The patent combines a high modulus plastic base layer (providing structural strength) with a specially formulated coating layer (providing acoustic optimization through controlled acoustic impedance and loss factor). This composite structure maintains the strength benefits of high modulus plastic while adding the acoustic performance needed for good listening effect, thereby resolving the contradiction.
Solution Approach 2:
The patent applies different material properties to different layers of the diaphragm: the base layer has high modulus for structural strength, while the coating layer has specific acoustic impedance and loss factor for acoustic optimization. This local differentiation of material qualities allows each layer to perform its specific function optimally, achieving both strength and good listening effect.
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 solution provides improved sound generation, increased sensitivity, and reduced weight, achieving a resonant frequency (F0) of 150-1500 Hz with better vibration consistency and durability, enhancing the overall listening experience.
Implementation Method 1
The voice coil vibrates under a magnetic field force in the magnetic gap, in response to an electric signal from an external circuit. The voice coil drives the diaphragm to vibrate and generate sound.
Implementation Method 2
The voice coil drives the diaphragm to vibrate and generate sound.
Implementation Method 3
The thermoplastic polyester elastomer is a copolymer composed of a hard segment A of polyester and a soft segment B of polyether or aliphatic polyester
Implementation Method 4
The copolymer structure of polyester and polyether or aliphatic polyester for enhanced resilience
Data Source
AI summary
A speaker is disclosed, which comprises a vibration system and a magnetic circuit system cooperating with the vibration system. The vibration system includes a speaker diaphragm, the speaker diaphragm comprises two surface layers compounded together and at least one intermediate layer positioned between the two surface layers, at least one of the surface layers is a thermoplastic polyester elastomer film layer, the at least one intermediate layer is an adhesive layer, the speaker diaphragm has Young's modulus of 5-700 MPa and an amplitude of 0.25 mm-1 mm, and the speaker has F0 of 150-1500 Hz. The speaker has a good sounding effect.