Elliptical Ring Radiator Diaphragm for Tweeter Resonance Damping
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Solution Overview
Problem
Traditional ring radiator tweeters suffer from undesirable resonance-induced sound quality issues due to uniform cross-sectional dimensions leading to strong resonant modes that affect the smoothness of frequency response.
Innovation Solution
Employing an elliptical diaphragm structure with varying radial chord lengths and optionally asymmetric voice coil positioning to suppress strong resonances by introducing multiple weaker resonant modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform cross-sectional dimensions are used in ring radiator tweeter rolls, then manufacturing simplicity is maintained, but strong resonant modes develop that adversely affect frequency response smoothness
Solution Approach 1:
The patent applies local quality by varying the cross-sectional dimensions of the rolls at different locations around the annular structure. Specifically, the inner and outer rolls have different inside and outside diameters at different angular positions, creating non-uniform local properties that suppress resonant modes while maintaining overall structural integrity and manufacturability.
Solution Approach 2:
The patent employs asymmetry by deliberately designing the rolls with non-circular cross-sections where the inside and outside diameters vary around the annular path. This asymmetric geometry breaks the symmetry that would otherwise support strong resonant modes, distributing vibrational energy more evenly across frequencies.
2Stability of the object's composition
If constant diameter dimensions are maintained in inner and outer rolls, then structural consistency is achieved, but resonant modes with specific wavelengths are amplified affecting sound quality
Solution Approach 1:
The patent applies parameter changes by systematically varying the inside and outside diameter parameters of the rolls around the annular structure. These dimensional parameters are modified at different angular positions to change the local stiffness and mass distribution, thereby suppressing resonant modes while maintaining structural consistency through controlled variation.
3Reliability
If elliptical diaphragm structure with varying radial chord lengths is implemented, then strong resonant modes are suppressed, but manufacturing complexity increases
Solution Approach 1:
The patent applies spheroidality by transitioning from circular to elliptical cross-sections in the rolls. This curvature variation, where the inside and outside diameters differ at various angular positions, creates varying radial chord lengths that suppress resonant modes. The elliptical geometry is achieved through standard manufacturing processes, balancing complexity with effectiveness.
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 elliptical diaphragm design minimizes audible resonant modes, providing improved sound quality by distributing resonances across a wider frequency range, reducing the impact of strong eigenmodes.
Implementation Method 1
Across the poles there is magnetic flux, which causes the voice coil, when energized, to move axially in response to current in the coil from an input signal
Implementation Method 2
magnetic flux, which causes the voice coil, when energized, to move axially
Implementation Method 3
the diameter dimensions (inside diameter to outside diameter) or radial distance from the edges to the voice coil is constant around the diaphragm... a single strong resonant mode will develop which corresponds to that uniform radial Chord length
Data Source
AI summary
A loudspeaker driver or tweeter (e.g., 100, 200 or 300) having a voice coil connected with a loudspeaker diaphragm (e.g., 106, 206 or 306), having a substantially circular diaphragm portion which is connected with or rests upon a voice coil attachment segment (e.g., 104, 204, 304). The diaphragm also includes a first central elliptical (non-circular-shaped) inner roll portion (e.g., 112, 212, 312) defining a central recessed area and a second, outer elliptical (non-circular-shaped) roll portion (e.g., 108, 208, 308) so the central portion and the outer roll portion that have substantially elliptical edge circumferences with substantially circular central peripheral edges to define diaphragm segments with a varying radial Chord lengths having non-uniform diameter dimensions (inside diameter to outside diameter) and when in use, the excursion of the diaphragm is controlled such that any breakup modes are minimized and the associated resonances are minimized.