Thermoplastic Polyester Elastomer Speaker Diaphragm
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Solution Overview
Problem
Existing speaker diaphragms, particularly those made from high modulus plastic films and silicone rubber, suffer from poor performance in terms of sound quality, sensitivity, and weight, due to their low modulus and hardness, leading to reduced space allowance for vibration and increased weight, resulting in low sensitivity and poor listening experience.
Innovation Solution
A speaker diaphragm comprising a thermoplastic polyester elastomer film layer with a specific composition and structure, including a copolymer of hard and soft segments, which provides a balance of hardness, toughness, and resilience, allowing for a thinner design with improved vibration sensitivity and sound generation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone rubber is used for the diaphragm to achieve waterproof and high sound quality, then sound quality is improved, but the modulus and hardness are low, requiring a thicker diaphragm which reduces vibration space and increases weight, resulting in low sensitivity
Solution Approach 1:
The patent changes the material parameter from silicone rubber to thermoplastic polyester elastomer, which has superior modulus and hardness while maintaining flexibility. This parameter change allows the diaphragm to be thinner, reducing weight and improving sensitivity while preserving sound quality.
Solution Approach 2:
The patent uses a composite structure consisting of a thermoplastic polyester elastomer film layer and a damping film layer. This composite material approach combines the high modulus characteristics of polyester elastomer with the damping properties of the second layer, achieving both sound quality and reduced weight.
2Reliability
If silicone rubber is used for the diaphragm to achieve waterproof and high sound quality, then sound quality is improved, but the modulus and hardness are low, requiring a thicker diaphragm which reduces vibration space, resulting in low sensitivity
Solution Approach 1:
The patent changes the material parameter from silicone rubber to thermoplastic polyester elastomer, which has superior modulus and hardness. This allows the diaphragm to achieve the required stiffness with less thickness, preserving vibration space and improving sensitivity.
Solution Approach 2:
The composite structure of thermoplastic polyester elastomer film layer combined with damping film provides the necessary mechanical properties with reduced thickness, maintaining vibration space while improving sound quality.
3Strength
If high modulus plastic film layers are used for the diaphragm, then structural integrity is improved, but the overall performance is poor and listening effect is degraded
Solution Approach 1:
The patent employs a composite material structure where the thermoplastic polyester elastomer film layer provides structural integrity and the damping film layer enhances sound quality. This composite approach resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The patent applies different material properties to different functional requirements: the thermoplastic polyester elastomer provides strength and structural integrity, while the damping film provides acoustic performance. This local differentiation of material qualities resolves the contradiction between strength and sound quality.
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 enhances the speaker's sensitivity, sound quality, and durability by offering a wider elastic area, reduced distortion, and improved resilience, enabling better low-frequency performance and increased loudness while maintaining structural integrity.
Implementation Method 1
the thermoplastic polyester elastomer film layer has a glass transition temperature less than or equal to 20° C.
Implementation Method 2
The voice coil vibrates under a magnetic field force in the magnetic gap, in response to an electric signal from an external circuit.
Data Source
AI summary
The present disclosure provides a speaker, comprising a vibration system including a speaker diaphragm and a magnetic circuit system cooperating with the vibration system. The speaker diaphragm comprises a thermoplastic polyester elastomer membrane and has a vibration amplitude of 0.25-1 mm, and the speaker has F0 of 150-1500 Hz. The speaker has the characteristic of good listening effect.