Multi-Layer Loudspeaker Diaphragm for Full-Range Response
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Solution Overview
Problem
Traditional vibrating membranes for headphone speakers have a narrow frequency band, poor stability, and are prone to deformation due to their single-layer structure, failing to meet full frequency requirements and having a short service life.
Innovation Solution
A vibrating membrane with a three-layer structure comprising a bottom layer for low-frequency reinforcement, a composite metal layer for vibration uniformity, and a composite platy layer for high-frequency compensation, made of thin-film polyester resin with a copper ring, which can be disposed at the transitional part or on the entire circular top with edges extending to the transitional part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer homogeneous structure is used, then the structure is simple and easy to manufacture, but the frequency band is narrow and cannot meet full frequency requirements
Solution Approach 1:
The patent applies composite materials by constructing a multi-layer diaphragm structure consisting of a soft layer, rigid layer, and damping layer. Each layer is made of different materials with specific properties: the soft layer (first polymer material) provides flexibility and low-frequency response, the rigid layer (second polymer material with higher glass transition temperature) provides structural support and high-frequency response, and the damping layer (viscoelastic material) controls vibrations. This composite structure enables the diaphragm to cover the full frequency band while maintaining manufacturability through layer-by-layer construction.
Solution Approach 2:
The patent segments the diaphragm into three distinct functional layers: a soft layer for low-frequency response, a rigid layer for high-frequency response and structural support, and a damping layer for vibration control. This segmentation allows each layer to be optimized independently for its specific function while working together to achieve full frequency band coverage. The layered structure resolves the contradiction by dividing the single homogeneous layer into multiple specialized layers that can be manufactured separately and assembled.
2Ease of manufacture
If a single-layer structure is used, then the manufacturing process is simple, but the stability is poor and the diaphragm is prone to deformation
Solution Approach 1:
The patent uses composite materials with different mechanical properties arranged in layers to improve structural stability. The rigid layer provides structural support and resistance to deformation, while the soft layer and damping layer provide flexibility and vibration damping. This composite construction enhances overall reliability without significantly complicating the manufacturing process, as each layer can be formed using standard thin-film fabrication techniques and bonded together.
Solution Approach 2:
The patent applies local quality by assigning different material properties to different regions of the diaphragm structure. The rigid layer has higher glass transition temperature and stiffness for structural support, the soft layer has lower glass transition temperature for flexibility, and the damping layer has viscoelastic properties for vibration control. This local differentiation of material properties within the overall structure improves stability and resistance to deformation while maintaining manufacturing feasibility.
3Ease of manufacture
If homogeneous material is used, then the manufacturing is easy, but the vibration uniformity is poor and transient response is slow
Solution Approach 1:
The patent employs composite materials with different mechanical and thermal properties arranged in specific layers to improve transient response and vibration uniformity. The soft layer with lower glass transition temperature allows for faster molecular relaxation and quicker response to acoustic signals, while the rigid layer provides structural integrity. The damping layer with viscoelastic properties dissipates vibrations efficiently. This composite structure achieves fast transient response and uniform vibration distribution while remaining manufacturable through conventional multi-layer fabrication processes.
4Ease of manufacture
If a simple structure is used, then the production cost is low, but the service life is short due to deformation
Solution Approach 1:
The patent uses composite materials arranged in a multi-layer structure to extend service life by preventing deformation. The rigid layer provides long-term structural support, the soft layer maintains flexibility to prevent cracking, and the damping layer reduces stress through vibration dissipation. This composite construction enhances durability and service life while keeping production costs reasonable, as each layer can be manufactured using cost-effective thin-film techniques and bonded together with standard adhesive processes.
Solution Approach 2:
The patent applies beforehand cushioning by incorporating a damping layer made of viscoelastic material between the soft and rigid layers. This damping layer acts as a cushion that absorbs and dissipates vibrations and stresses before they can cause deformation or damage to the diaphragm structure. By providing this protective cushioning in advance, the patent extends the service life of the diaphragm while maintaining a relatively simple and cost-effective multi-layer structure.
Data Source
AI summary
The present invention relates to a type of vibrating membrane for speakers comprising the vibrating membrane body which comprises: A bottom layer used to reinforce the low frequency, a surface disposed on the said bottom layer, a composite metal layer used to ensure vibration uniformity, and a composite platy layer used for HF compensation disposed between the said bottom layer and the said composite metal layer. A type of speaker with the structure of the said vibrating membrane is also disclosed in the invention. Application of the vibrating membrane for speakers and the speaker using the said vibrating membrane as claimed in the invention could be such as to: enable excellent transient response speed, ensure vibration uniformity and obtain flat response in the working area; eliminate MF (medium frequency) and HF (high frequency) resonance to meet the full frequency band requirements of the headphone speakers; boast good flexural behavior to make the speaker structure more stable and less prone to deformation, thereby extending the service life and promoting the quality of the product.