Speaker Diaphragm Segmented Lamination for Acoustic Trade-offs
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Solution Overview
Problem
Existing speaker diaphragms face challenges in adjusting rigidity across different frequency bands, leading to trade-offs in high-frequency and low-frequency sound generation, as increasing rigidity for one frequency range compromises the other.
Innovation Solution
A speaker diaphragm design featuring multiple lamination regions with varying numbers of layers and average densities, allowing for adjustable rigidity and enhanced acoustic characteristics across frequency bands by alternating solid and porous layers, and using a method of hot-pressing to form a cone shape with uniform thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rigidity of the speaker diaphragm is increased to enhance high-frequency sound generation, then the high-frequency acoustic characteristics are improved, but the low-frequency sound generation is compromised
Solution Approach 1:
The speaker diaphragm is divided into multiple lamination regions (first lamination region and second lamination region) with different numbers of layers. Each region can be optimized independently for specific frequency responses, allowing the diaphragm to achieve both high-frequency and low-frequency sound generation capabilities simultaneously without the trade-off present in uniform structures.
Solution Approach 2:
Different regions of the speaker diaphragm are assigned different average densities and layer configurations. The first lamination region has a different average density than the second lamination region, enabling each region to provide acoustic characteristics tailored to specific frequency bands while maintaining overall diaphragm functionality.
2Reliability
If the number of layers is increased to improve sound generation capability, then the acoustic performance is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The multi-layer structure is segmented into distinct lamination regions with different numbers of layers. This segmentation allows for systematic construction and assembly, making the manufacturing process more manageable despite the increased total number of layers, while still achieving the desired acoustic performance through strategic layer distribution.
3Strength
If the thickness of the speaker diaphragm is increased to improve durability, then the structural strength is enhanced, but the uniformity of acoustic characteristics is compromised
Solution Approach 1:
The speaker diaphragm employs varying thicknesses in different regions through different lamination configurations. The first and second lamination regions have different numbers of layers, creating localized thickness variations that allow each region to optimize its acoustic characteristics while the overall structure maintains sufficient durability through the cumulative layer structure.
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 design effectively generates sounds in both high-frequency and low-frequency bands without compromising rigidity, improving durability and acoustic performance by maintaining uniformity and reducing resonance.
Implementation Method 1
hot-pressing the lamination body to form the lamination body into a cone shape having a substantially uniform thickness
Data Source
AI summary
A speaker diaphragm includes a first lamination region and a second lamination region. In the first lamination region, a plurality of layers are laminated in a thickness direction of the speaker diaphragm. In the second lamination region, a plurality of layers different in number from the plurality of layers in the first lamination region are laminated. The second lamination region is different from first lamination region in average density.