Variable Stiffness Diaphragm for Audio Transducers
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Solution Overview
Problem
Conventional audio transducers suffer from acoustic distortion due to diaphragm breakup at higher frequencies, which is exacerbated by the use of expensive materials and manufacturing complexities, and results in reduced audio quality.
Innovation Solution
The solution involves varying the thickness and stiffness of the diaphragm in specific regions to control nonlinear displacement, thereby reducing distortion and increasing the breakup frequency, without using expensive materials or increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional diaphragm materials and uniform thickness are used, then manufacturing is simple and cost-effective, but acoustic distortion occurs due to diaphragm breakup at higher frequencies
Solution Approach 1:
The patent applies local quality by varying the thickness of the diaphragm in specific regions rather than using uniform thickness throughout. The diaphragm includes a first region with a first thickness and a second region with a second thickness that is greater than the first thickness. This localized thickness variation increases stiffness where needed to control nonlinear displacement and reduce distortion at higher frequencies, while maintaining simplicity in other areas.
2Manufacturing precision
If expensive materials are used to reduce diaphragm breakup, then acoustic distortion is reduced, but manufacturing cost increases
Solution Approach 1:
The patent applies parameter changes by modifying the physical dimension (thickness) of the diaphragm rather than changing the material composition. By varying the thickness parameter in different regions of the diaphragm, the invention achieves improved acoustic performance and reduced distortion without requiring expensive materials. This approach maintains cost-effectiveness while achieving the desired acoustic performance.
3Manufacturing precision
If diaphragm stiffness is increased to control nonlinear displacement, then distortion is reduced, but diaphragm weight increases
Solution Approach 1:
The patent applies local quality by strategically placing increased thickness (and thus increased stiffness) only in the second region of the diaphragm where it is most needed to control nonlinear displacement. The first region maintains a thinner, lighter construction. This localized approach reduces distortion through targeted stiffness enhancement while minimizing the overall weight increase that would result from uniformly thickening the entire diaphragm.
Data Source
AI summary
A diaphragm for an audio transducer includes an annular body defining a central aperture, a first surface of the body extending between a radially inner edge adjacent the aperture and a radially outer edge, and a second surface of the body opposite the first surface, the second surface extending between the radially inner edge and the radially outer edge. Along a first azimuthal direction, the body has a first range of thicknesses extending between the first and second surfaces. Along a second azimuthal direction, the body has a second range of thicknesses extending between the first surface and the second surface, the second range of thicknesses being different than the first range of thicknesses.