Speaker Diaphragm Using Thermoplastic Polyester Elastomer Film
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Solution Overview
Problem
Existing speaker diaphragms, particularly those using high modulus plastic films and silicone rubber, suffer from poor sound quality due to low modulus or hardness, leading to reduced sensitivity and increased weight, which affects vibration space and overall performance.
Innovation Solution
A speaker diaphragm comprising a thermoplastic polyester elastomer film layer with a copolymer structure of polyester hard and soft segments, offering high structural strength, toughness, and resilience, with a glass transition temperature ≤20°C and Young's modulus of 1-1000 MPa, enhancing sound generation and vibration sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If silicone rubber is used to meet F0 requirements, then the diaphragm can achieve the required resonant frequency, but the diaphragm becomes relatively thick and heavy, reducing sensitivity and vibration space
Solution Approach 1:
The patent changes the material parameters by using thermoplastic polyester elastomer with specific glass transition temperature (≤20°C) and Young's modulus (1-1000 MPa) range, allowing the diaphragm to achieve required F0 with thinner and lighter construction compared to traditional silicone rubber
Solution Approach 2:
The patent employs a composite structure combining thermoplastic polyester elastomer film layer with adhesive layers, creating a multi-layer composite diaphragm that optimizes both mechanical properties and weight characteristics
2Strength
If high modulus plastic film layers are used, then the diaphragm structure is strengthened, but the overall performance and sound quality deteriorate
Solution Approach 1:
The patent transitions from high modulus plastic materials to thermoplastic polyester elastomer with optimized modulus range (1-1000 MPa) and specific glass transition temperature (≤20°C), improving sound quality while maintaining adequate structural strength
Solution Approach 2:
The patent applies different material properties to different functional requirements: the thermoplastic polyester elastomer provides optimal acoustic properties and flexibility, while adhesive layers provide bonding functionality, creating localized optimization throughout the diaphragm structure
3Stability of the object's composition
If the diaphragm thickness is increased to meet F0 requirements with low modulus material, then the resonant frequency requirement is satisfied, but the vibration space is reduced
Solution Approach 1:
The patent utilizes the specific glass transition temperature (≤20°C) and modulus characteristics of thermoplastic polyester elastomer to achieve optimal balance between diaphragm thickness, vibration space, and F0 requirement, allowing thinner diaphragms compared to traditional materials
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 thermoplastic polyester elastomer film layer provides improved stiffness, resilience, and damping, resulting in better sound quality, higher sensitivity, and reduced risk of damage, while maintaining performance across varying temperatures.
Implementation Method 1
an elastic recovery rate of the thermoplastic polyester elastomer film layer after 10% strain is greater than or equal to 80%
Implementation Method 2
a loss factor of the thermoplastic polyester elastomer film layer is greater than or equal to 0.015
Data Source
AI summary
The present disclosure provides a speaker diaphragm and a speaker. The speaker diaphragm comprises a thermoplastic polyester elastomer film layer (11), wherein a thermoplastic polyester elastomer is a copolymer composed of a polyester hard segment A and a polyether or aliphatic polyester soft segment B, and the thermoplastic polyester elastomer film layer has a glass transition temperature being less than or equal to 20° C., and a thermoplastic temperature being 50° C.-200° C. The use of the thermoplastic polyester elastomer film layer enables the speaker diaphragm to have a good flexibility, a high reliability, and a good durability, and improves the anti-destructive ability of the speaker.