Speaker System Elastic Sheet Pseudo-Volume Expansion
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Solution Overview
Problem
Conventional speaker systems face challenges in reproducing low sound frequencies effectively due to the moisture absorption of activated carbon, which reduces sound pressure levels, and require larger enclosures to achieve improved sound pressure frequency characteristics, making them unsuitable for small electronic devices.
Innovation Solution
A speaker system with an elastic sheet composed of thinner and thicker resin fibers, entangled together, is used within a small enclosure, providing a pseudo-volume expansion effect that enhances sound pressure levels in the low sound range without increasing the enclosure's actual volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon is used to improve sound pressure level in low sound range, then sound pressure level is improved, but moisture absorption increases which reduces sound pressure level
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the moisture absorption property of activated carbon not as a drawback but as a functional feature. The activated carbon elastic sheet absorbs moisture from the air gap, preventing condensation and maintaining stable acoustic properties. This transforms the harmful moisture absorption into a beneficial moisture control mechanism that preserves sound pressure levels.
Solution Approach 2:
The patent employs composite materials by combining activated carbon with resin to create an elastic sheet structure. The resin-impregnated activated carbon fiber layer forms a composite material that maintains the sound-absorbing properties of activated carbon while adding moisture resistance and structural integrity. This composite approach allows the material to function effectively in controlling both sound pressure levels and moisture.
2Object-affected harmful factors
If resin-impregnated layers are formed on activated carbon to suppress moisture absorption, then moisture resistance is improved, but fine pores are closed reducing sound pressure level improvement
Solution Approach 1:
The patent applies local quality by differentiating the treatment of the activated carbon structure. Instead of uniformly impregnating all surfaces with resin, the resin is applied selectively to the front and back surfaces while maintaining the porous structure of the activated carbon fibers. This localized resin application provides moisture resistance at the boundaries while preserving the fine pores throughout the material for sound pressure level improvement.
Solution Approach 2:
The patent utilizes porous materials by maintaining the fine pore structure of activated carbon while using resin-impregnated layers as boundary conditions. The porous activated carbon fiber layer allows sound waves to penetrate and interact with the material, improving sound pressure levels, while the resin-impregnated surfaces prevent moisture absorption. This dual approach leverages the porous nature of the material for acoustic performance.
3Reliability
If enclosure volume is increased to improve sound pressure frequency characteristics, then sound pressure level is improved, but device size increases making it unsuitable for small electronic devices
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical parameters of the elastic sheet material. The elastic sheet is designed with specific properties including elastic modulus, porosity, and resin content that can be adjusted to optimize sound pressure level improvement within a fixed enclosure volume. By changing material parameters rather than enclosure dimensions, the system achieves improved acoustic performance without increasing device size.
Solution Approach 2:
The patent employs composite materials to achieve superior acoustic performance within constrained space. The resin-impregnated activated carbon elastic sheet combines the sound-absorbing properties of activated carbon with the structural stability and moisture resistance of resin. This composite material provides enhanced sound pressure frequency characteristics within the same enclosure volume, effectively utilizing space through material composition rather than dimensional expansion.
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 speaker system effectively improves sound pressure levels in the low sound range, allowing for a compact design suitable for small electronic devices while maintaining excellent sound reproduction across a wide frequency range.
Implementation Method 1
providing a pseudo-volume expansion effect that enhances sound pressure levels in the low sound range without increasing the enclosure's actual volume
Implementation Method 2
when the fine pores of the activated carbon adsorb water vapor, the sound pressure level of a low sound is reduced
Data Source
AI summary
A speaker system includes an enclosure, a speaker unit, and an elastic sheet. The speaker unit is disposed in the enclosure. The elastic sheet includes a first fiber made of a resin and a second fiber made of a resin, and is disposed in the enclosure. The second fiber is thicker than the first fiber and entangled with the first fiber.