Loudspeaker Diaphragm Toughness via Elastomer Reinforcement
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Solution Overview
Problem
Conventional micro-loudspeaker diaphragms face challenges in meeting the increasing demands for acoustic performance due to the limitations in toughness of currently available composite films and polyetheretherketone materials, which can lead to rupture during power tests and affect the reliability of the product.
Innovation Solution
A loudspeaker diaphragm is designed with a lamination structure comprising a base layer, a reinforcing layer, and an intermediate layer, where the base layer is made from materials like polyetheretherketone, polyarylester, or polyethylene terephthalate, and the reinforcing layer is composed of thermoplastic polyurethane elastomer or thermoplastic elastomer, enhancing toughness and acoustic performance by thermal compounding and strategic lamination orders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional composite films and polyetheretherketone materials are used for diaphragm, then the diaphragm structure is simple and easy to manufacture, but the toughness is insufficient leading to rupture during power tests
Solution Approach 1:
The patent applies composite materials by combining polyetheretherketone base layer with acrylic acid adhesive layer to create a multi-layer composite diaphragm structure. This composite approach enhances the toughness and mechanical strength of the diaphragm while maintaining manufacturability, directly resolving the contradiction between strength improvement and structural complexity.
Solution Approach 2:
The diaphragm is segmented into multiple functional layers: polyetheretherketone base layer, acrylic acid adhesive layer, and additional reinforcing layers. This segmentation allows each layer to contribute specific properties (structural integrity, adhesion, toughness) while collectively solving the rupture problem without requiring complete redesign of the entire diaphragm structure.
2Reliability
If the diaphragm material toughness is increased to prevent rupture, then the reliability is improved, but the acoustic performance may be compromised
Solution Approach 1:
The patent applies local quality by using different materials for different functional requirements: polyetheretherketone provides structural stability and heat resistance, while acrylic acid adhesive layers provide toughness and flexibility. This localized material assignment ensures both reliability (preventing rupture) and acoustic performance (maintaining vibration characteristics) without compromising either property.
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 proposed diaphragm structure significantly increases toughness, prevents rupture during power tests, and improves the reliability and acoustic performance of micro-loudspeaker products by combining a base layer with a reinforcing layer, ensuring robust mechanical strength and flexibility.
Implementation Method 1
the base layer is any one selected from a group consisting of a polyetheretherketone layer, a polyarylester layer, a polyethylene terephthalate layer and a polyetherimide layer
Implementation Method 2
the reinforcing layer is a thermoplastic polyurethane elastomer layer or a thermoplastic elastomer layer
Implementation Method 3
the base layer bonds with the reinforcing layer by thermal compounding
Data Source
AI summary
The present application provides a loudspeaker diaphragm, comprising a first surface layer, a middle layer and a second surface layer, that are in a stacked structure. The loudspeaker diaphragm is characterized in that: at least one surface layer of the first surface layer and the second surface layer has a composite structure which is composed of a base layer and a reinforcing layer, and the other surface layer comprises a base layer; the base layer is a poly(ether-ether-ketone) layer, a polyarylester layer, a polyethylene terephthalate layer, a polyetherimide layer or a composite structure composed of any two of the above layers, and the reinforcing layer is a thermoplastic polyurethane elastomer layer or a thermoplastic elastomer layer. The loudspeaker diaphragm can reduce diaphragm breakage after power test is performed on a loudspeaker product, improve substrate toughness and improve acoustical property of the loudspeaker.