Plasma-Coated Speaker Cover for Durable Acoustic Transparency
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Solution Overview
Problem
Conventional speaker materials are either too fragile for portable speakers or, when made more durable, compromise acoustic transparency, and existing treatments like polyurethane coatings further reduce sound quality.
Innovation Solution
A plasma process is used to treat speaker covers with a fluoro monomer, maintaining acoustic transparency while enhancing durability and resistance to water and dirt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thicker and denser fabric is used to make the speaker cover more durable, then strength and durability are improved, but acoustic transparency deteriorates
Solution Approach 1:
The patent applies a thin film plasma coating (nanometer to micrometer scale) onto the speaker fabric surface. This thin film provides durability and protective functions without significantly blocking sound waves, resolving the contradiction between needing a durable cover and maintaining acoustic transparency. The coating is thin enough to be acoustically transparent while providing the required strength and protective properties.
Solution Approach 2:
The patent creates a composite structure by combining the speaker fabric base material with a plasma-deposited fluoro monomer coating layer. This composite material integrates the mechanical strength and durability of the fabric with the protective, water-resistant, and acoustically transparent properties of the plasma coating, achieving both durability and acoustic transparency simultaneously.
2Object-affected harmful factors
If polyurethane spray is applied to make the fabric water resistant, then resistance to water and dirt is improved, but acoustic transparency deteriorates
Solution Approach 1:
The patent changes the physical and chemical parameters of the coating by using plasma deposition of fluoro monomer instead of conventional polyurethane spray. The plasma process creates a coating with different thickness, density, and molecular structure parameters that are acoustically transparent while still providing water and dirt resistance. The fluoro monomer coating has lower acoustic impedance than polyurethane, allowing sound transmission.
Solution Approach 2:
The patent replaces the mechanical spray coating process with a plasma deposition process. The plasma process allows for more precise control of coating thickness and composition, creating a ultra-thin, uniform layer that maintains acoustic transparency while providing the desired water resistance. The plasma process also creates better adhesion and a more controlled coating structure.
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 plasma treatment results in a durable, water-resistant speaker cover that retains acoustic transparency, addressing the need for a robust yet acoustically transparent fabric for portable speakers.
Implementation Method 1
A plasma process is used to treat speaker covers with a fluoro monomer
Implementation Method 2
introducing a fluoro monomer into the plasma chamber, pulsing plasma for processing
Data Source
AI summary
A process for the manufacture of a speaker cover comprises loading the speaker cover into a plasma chamber, introducing a fluoro monomer into the plasma chamber, pulsing plasma for processing, removing any excess monomer gas from the plasma chamber, and removing the speaker cover from the plasma chamber.