Rectangular Diaphragm Corner Radius Inversion for Stiffness
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Solution Overview
Problem
Conventional diaphragms for electroacoustic transducers have suboptimal acoustic properties due to larger mean inner radius values at inner corner regions compared to outer corner regions, leading to reduced stiffness, increased wobbling, smaller fixing surfaces, and higher mechanical stresses, which can result in tears and acoustic distortions.
Innovation Solution
The diaphragm design features smaller mean inner radius values at inner corner regions compared to larger mean outer radius values at outer corner regions, with both corner regions having the same direction of curvature, enhancing stiffness and providing a larger moving surface for sound pressure production, while maintaining mechanical stability and facilitating voice coil winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mean inner radius value of inner corner regions is made larger than the mean outer radius value of outer corner regions (conventional design), then the diaphragm is easier to manufacture, but the stiffness in the inner corner regions is reduced leading to increased wobbling and degraded acoustic properties
Solution Approach 1:
The patent inverts the conventional radius relationship by making the inner corner radius smaller than the outer corner radius. This reversal of the traditional design approach increases stiffness in the inner corner regions where it is most needed for acoustic performance, while still maintaining manufacturability through the consistent curvature direction design
2Strength
If the mean inner radius value of inner corner regions is made smaller than the mean outer radius value of outer corner regions (invention), then the stiffness is increased reducing wobbling, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by creating different radius values at specific locations (inner corner vs outer corner) while maintaining the same curvature direction. This localized differentiation optimizes stiffness where needed without requiring complex manufacturing processes throughout the entire diaphragm structure
3Ease of manufacture
If the inner corner regions have opposite direction of curvature compared to outer corner regions (prior art), then the manufacturing is simplified, but the fixing surface area is reduced and mechanical stresses increase leading to tears and acoustic distortions
Solution Approach 1:
The patent uses asymmetry in the radius values (inner corner radius different from outer corner radius) while maintaining symmetry in the curvature direction. This asymmetric radius design with symmetric curvature direction optimizes both mechanical stability and manufacturing feasibility
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
This design improves the diaphragm's stiffness, reduces wobbling, increases the sound pressure production surface, and enhances mechanical stability, leading to better playback quality and easier voice coil manufacturing with reduced mechanical stresses.
Implementation Method 1
the diaphragm inner region (20) is provided for converting between sound waves and electrical signals
Data Source
Figure 1~2
Figure 3~5
AI summary
A diaphragm (6) for an electroacoustic transducer is preferably designed to be essentially rectangular and has a diaphragm inner region (20) for sound conversion and a diaphragm outer region (21) for attaching the diaphragm (6) and a diaphragm intermediate region (22) which lies between the diaphragm inner region (20) and the diaphragm outer region (21), wherein the diaphragm inner region (20) is delimited toward the outside by preferably rectilinear sides (23, 24, 25, 26) and the diaphragm outer region (21) is delimited toward the inside again by preferably rectilinear sides (31, 32, 33, 34), and wherein the aforementioned sides (23, 24, 25, 26) of the diaphragm inner region (20) are joined to rounded outer corner regions (27, 28, 29, 30) with a mean outer radius value R and the aforementioned sides (31, 32, 33, 34) of the diaphragm outer region (21) are joined to rounded inner corner regions (35, 36, 37, 38) with a mean inner radius value r, wherein the mean inner radius value r of each inner corner region (35, 36, 37, 38) is smaller than the mean outer radius value R of the opposite outer corner region (27, 28, 29, 30).