Curved Diaphragm Speaker Structure for Wider Frequency Bandwidth
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Solution Overview
Problem
Existing curved diaphragm speakers face challenges in expanding the reproduction frequency bandwidth, particularly in low frequencies, and improving sound quality, while maintaining a compact size and reducing manufacturing costs.
Innovation Solution
A speaker unit incorporating a first diaphragm in the form of a cone and a second diaphragm with multiple regions of different resonance characteristics, such as varying curvatures, thicknesses, or hardnesses, connected to a single driver unit, allowing for the reproduction of sounds with different resonance bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of the curved diaphragm is expanded to increase low frequency reproduction capability, then the low frequency reproduction capability is improved, but the device size increases
Solution Approach 1:
The curved diaphragm is designed with non-uniform thickness distribution, where the thickness varies along the radial direction. This local quality variation allows different regions of the diaphragm to contribute differently to frequency reproduction, enabling enhanced low frequency capability without increasing the overall diaphragm area or device volume.
Solution Approach 2:
The patent changes the physical parameter of thickness along the radial direction of the curved diaphragm. By controlling the thickness parameter to be non-uniform (thinner at the center, thicker at the edges), the resonant frequencies and vibration characteristics are modified to improve low frequency reproduction while maintaining a compact size.
2Adaptability or versatility
If multiple curved diaphragms with different resonance characteristics are used to expand frequency bandwidth, then the reproduction frequency bandwidth is improved, but the device complexity increases
Solution Approach 1:
The curved diaphragm is segmented into multiple functional regions with different resonance characteristics through controlled thickness variation. The diaphragm is divided into a first curved diaphragm region and a second curved diaphragm region, each contributing to different frequency ranges, thereby expanding the overall reproduction frequency bandwidth.
Solution Approach 2:
A single curved diaphragm structure serves multiple functions by incorporating different resonance characteristics within itself. The diaphragm simultaneously provides low frequency reproduction capability and high frequency reproduction capability through its varying thickness regions, eliminating the need for separate diaphragms and reducing device complexity.
3Reliability
If the thickness of the curved diaphragm is varied to improve resonance characteristics, then the sound quality is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes in the thickness distribution of the curved diaphragm to optimize resonance characteristics and sound quality. By establishing specific thickness relationships between different regions (first thickness and second thickness), the invention achieves improved sound quality while providing guidance for manufacturability.
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 speaker system achieves an expanded reproduction frequency bandwidth and improved sound quality without increasing size or cost, effectively catering to both hearing-impaired and hearing individuals by combining the strengths of cone-shaped and curved diaphragm speakers.
Implementation Method 1
a driver unit that drives the first diaphragm and the second diaphragm together
Implementation Method 2
the second diaphragm includes multiple regions of different resonance characteristics
Data Source
Figure 1~2
Figure 3~4
Figure 5~6B
AI summary
Provided is a high-performance and high-quality curved diaphragm speaker system that is capable of reproducing sounds in a plurality of bands and achieves performance sufficient for hard-of-hearing people and hearing people. [Solution] A speaker unit 10 of the present invention includes a first diaphragm 1 in a corn form, a second diaphragm 2 in a curved sheet form, and a driver unit 4 that drives both of the first diaphragm and the second diaphragm. A small diameter side 1a of the first diaphragm and one end side 2a of the second diaphragm are both connected to the driver unit. The second diaphragm has a plurality of regions having different resonance characteristics due to a change in the curvature of a diaphragm surface in the middle from the one end side to the other end side in a length direction. This speaker unit is attached to a housing 50 to form a speaker 100.