Glass Sheet Composite Diaphragm for High-Frequency Sound
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Solution Overview
Problem
Conventional materials used for loudspeaker diaphragms, such as paper and resin, struggle with high-frequency sound reproduction due to low acoustic velocity and high loss coefficients, leading to poor sound pressure output and unwanted reverberant sounds, while materials like metal and glass suffer from resonance issues and tone deterioration.
Innovation Solution
A glass sheet composite is developed with a liquid layer sandwiched between two glass sheets, featuring a high loss coefficient and acoustic velocity, along with specific viscous and surface tension properties, and containing particles for improved color tone reproducibility and light scattering, which enhances acoustic performance and screen functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If glass materials are used to achieve high acoustic velocity, then high-frequency sound reproduction is improved, but resonance vibrations are generated causing tone deterioration
Solution Approach 1:
The invention uses a composite structure consisting of multiple glass sheets (first glass sheet and second glass sheet) bonded together with a liquid layer. This composite configuration allows the system to achieve high acoustic velocity for high-frequency sound reproduction while the multi-layer structure with liquid damping suppresses resonance vibrations, resolving the contradiction between speed and harmful resonance effects.
Solution Approach 2:
A liquid layer is introduced as an intermediary between the first glass sheet and the second glass sheet. This liquid layer serves as a damping medium that suppresses resonance vibrations generated by the glass sheets, while still allowing the overall structure to maintain high acoustic velocity for high-frequency sound reproduction.
2Speed
If glass materials are used to achieve high acoustic velocity, then high-frequency sound reproduction is improved, but unintended reverberant sound remains due to small loss coefficients
Solution Approach 1:
The composite structure of multiple glass sheets with a liquid layer creates a system that maintains the high acoustic velocity of glass for high-frequency reproduction while the liquid layer contributes to increased energy loss through its viscous properties, reducing unwanted reverberant sound.
Solution Approach 2:
The liquid layer acts as an intermediary that introduces energy dissipation mechanisms between the glass sheets. Its viscous properties create internal friction that increases the overall loss coefficient of the composite structure, suppressing reverberant sound while preserving the high acoustic velocity needed for high-frequency reproduction.
3Adaptability or versatility
If particles are added to improve light scattering and color tone reproducibility, then screen function is enhanced, but the structure becomes more complex
Solution Approach 1:
The invention merges multiple functions into the liquid layer: it serves as a bonding agent between glass sheets, provides damping to suppress resonance, and when particles are added, also enables light scattering and color tone reproduction. This consolidation of multiple functions into a single component reduces overall structural complexity while enhancing screen functionality.
Solution Approach 2:
The liquid layer is designed to perform multiple functions simultaneously: structural bonding, vibration damping, and optical properties enhancement through particle incorporation. This multi-functionality allows the system to achieve good screen function without proportionally increasing structural complexity, as one component handles multiple roles.
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 glass sheet composite achieves good acoustic performance, color tone reproducibility, transparency, and light scattering, effectively addressing the limitations of previous materials by providing a diaphragm and image projection structure with improved high-frequency sound reproduction and reduced resonance issues.
Implementation Method 1
The liquid layer has a viscous coefficient of 1×10−4-1×103 Pass at 25° C., and a surface tension of 15-80 mN/m at 25° C.
Implementation Method 2
The liquid layer has a viscous coefficient of 1×10−4-1×103 Pass at 25° C., and a surface tension of 15-80 mN/m at 25° C.
Implementation Method 3
The liquid layer contains particles whose mean particle diameter is 0.3-1 μm
Implementation Method 4
an acoustic velocity of longitudinal wave greater than or equal to 5.0×103 m/s in a sheet thickness direction
Data Source
AI summary
A glass sheet composite includes a first glass sheet; a second glass sheet; and a liquid layer sandwiched between the first glass sheet and the second glass sheet. The glass sheet composite has a loss coefficient greater than or equal to 1×10−2 at 25° C., and an acoustic velocity of longitudinal wave greater than or equal to 5.0×103 m/s in a sheet thickness direction at 25° C. The liquid layer has a viscous coefficient of 1×10−4-1×103 Pa·s at 25° C., and a surface tension of 15-80 mN/m at 25° C. The liquid layer contains particles whose mean particle diameter is 0.3-1 μm.