Speaker Diaphragm Ring Member Rigidity Breakup Mode
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Solution Overview
Problem
Existing speaker diaphragms for headphones face challenges in achieving sufficient rigidity while maintaining a thin and lightweight design, leading to degradation in sound pressure and frequency characteristics due to breakup mode issues in high frequency ranges.
Innovation Solution
A speaker diaphragm design featuring a body member with a center cap and cone part, where a ring member is joined to the cone part, made from biocellulose and carbon fiber-reinforced pulp materials, to increase rigidity without altering the shape, and a diaphragm fixing ring is added for enhanced structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of the diaphragm is decreased to make the speaker thin, then the overall thickness is reduced, but the rigidity of the diaphragm decreases causing breakup mode in high frequency range
Solution Approach 1:
The diaphragm uses a composite structure combining a center cap part and a cone part made from different materials with distinct properties. The center cap part uses a material optimized for rigidity while the cone part uses a material optimized for other acoustic properties, allowing the thin diaphragm to maintain sufficient rigidity without breakup mode
Solution Approach 2:
Different regions of the diaphragm are made with different material properties - the center cap part has different material characteristics than the cone part. This local differentiation allows each region to contribute optimally to the overall performance, with the center cap providing rigidity support to prevent breakup mode while keeping the overall diaphragm thin
2Strength
If the thickness of the diaphragm is increased to improve rigidity, then the rigidity increases, but the overall thickness becomes large and mass increases causing decrease in sound pressure
Solution Approach 1:
The composite structure of center cap part and cone part allows optimization of rigidity without proportionally increasing mass. By strategically placing rigid material only where needed (center cap) rather than throughout the entire diaphragm, the design achieves necessary rigidity with minimal mass increase
Solution Approach 2:
Rigidity-enhancing materials or structures are applied locally to the center cap part rather than uniformly across the entire diaphragm. This localized approach provides the necessary rigidity support to prevent breakup mode while minimizing the overall mass increase that would occur with uniform thickening
3Strength
If the total height of the dome portion is increased to improve rigidity, then the rigidity increases, but the size increases affecting wear comfort
Solution Approach 1:
The composite structure provides rigidity enhancement through material differentiation rather than increased height. The center cap part uses materials or structures optimized for rigidity while maintaining a compact profile, allowing the diaphragm to achieve necessary stiffness without increasing the overall dome height
Solution Approach 2:
Rigidity is enhanced locally through material selection and structural design in the center cap part rather than through overall height increase. This allows the diaphragm to maintain a low-profile dome suitable for wearable devices while still preventing breakup mode through localized rigidity enhancement
4Strength
If a ring-shaped member with increased thickness is added to ensure rigidity, then the rigidity increases, but the production becomes complicated and mass increases
Solution Approach 1:
The center cap part and cone part are integrated into a single unified structure rather than being separate components requiring assembly. This integration simplifies production by eliminating the need for separate ring-shaped members and complex joining processes, while still achieving the necessary rigidity through the composite material design
Solution Approach 2:
The composite structure is achieved through material differentiation within a unified geometry rather than through additional structural components. This approach maintains production simplicity while providing the rigidity enhancement needed to prevent breakup mode
Data Source
AI summary
A diaphragm has a configuration including a diaphragm main body, a cone part on an outer periphery of the diaphragm main body, a ring member joined to the cone part, and an edge having an inner periphery joined to an outer periphery of the ring member or an outer periphery of the cone part. This configuration improves the rigidity without changing the shape of the diaphragm main body, that is, without giving rise to a mass increase in the diaphragm main body, and keeps the sound pressure from decreasing in a high frequency range.