Waterproof Sound-Transmitting Sheet With Reinforcement Member
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Solution Overview
Problem
Conventional waterproof sound-transmitting sheets lose waterproof performance and acoustic efficiency due to stretching under high pressure, as their micropores enlarge and elasticity is reduced, leading to sound loss and adhesive separation from devices.
Innovation Solution
A waterproof sound-transmitting sheet with a reinforcement member having higher stiffness than the sound-transmitting layer, spaced apart to minimize displacement and maintain elasticity, composed of materials like PET, PP, or Nylon, and formed in a ring shape to absorb pressure and maintain sound transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterproof sound-transmitting sheet is used to block water and dust, then waterproof performance is improved, but sound transmission efficiency deteriorates due to micropore enlargement when stretched under pressure
Solution Approach 1:
The patent applies local quality by creating a hydrophobic coating layer with specific surface properties (contact angle ≥90°) on the porous substrate. This localized treatment allows the surface to repel water while maintaining the underlying porous structure's sound transmission capability, resolving the contradiction between waterproofing and acoustic performance
Solution Approach 2:
The patent uses composite materials by combining a porous substrate (such as PTFE membrane) with a hydrophobic coating layer. This composite structure integrates the water-blocking capability of the hydrophobic surface with the sound-transmitting properties of the porous base material, achieving both waterproof performance and sound transmission efficiency
2Stress or pressure
If the waterproof layer is stretched under high pressure (5 atm), then waterproof performance is initially improved, but the micropores become larger reducing waterproof performance
Solution Approach 1:
The patent applies parameter changes by modifying the surface energy parameters of the porous substrate through hydrophobic coating treatment. This changes the surface properties to achieve high water contact angle (≥90°), allowing the material to maintain waterproof performance even when stretched under high pressure (5 atm), as the hydrophobic effect prevents water penetration through the micropores
3Reliability
If the waterproof layer is stretched under continuous pressure, then initial waterproofing is achieved, but elasticity is lost preventing restoration
Solution Approach 1:
The patent applies local quality by creating a hydrophobic coating layer with specific surface properties (contact angle ≥90°) on the porous substrate. This localized treatment allows the surface to repel water while maintaining the underlying porous structure's sound transmission capability, resolving the contradiction between waterproofing and acoustic performance
Solution Approach 2:
The patent uses composite materials by combining a porous substrate (such as PTFE membrane) with a hydrophobic coating layer. This composite structure integrates the water-blocking capability of the hydrophobic surface with the sound-transmitting properties of the porous base material, achieving both waterproof performance and sound transmission efficiency
4Ease of operation
If the protective layer moves under sound pressure, then acoustic function is achieved, but collision with the stretched waterproof layer causes sound loss and noise
Solution Approach 1:
The patent applies parameter changes by modifying the surface energy parameters of the porous substrate through hydrophobic coating treatment. This changes the surface properties to achieve high water contact angle (≥90°), allowing the material to maintain waterproof performance even when stretched under high pressure (5 atm), as the hydrophobic effect prevents water penetration through the micropores
5Ease of manufacture
If adhesive layer is used to adhere the sheet to portable terminal, then attachment is achieved, but adhesive separation occurs under high pressure
Solution Approach 1:
The patent applies local quality by creating a hydrophobic coating layer with specific surface properties (contact angle ≥90°) on the porous substrate. This localized treatment allows the surface to repel water while maintaining the underlying porous structure's sound transmission capability, resolving the contradiction between waterproofing and acoustic performance
Solution Approach 2:
The patent uses composite materials by combining a porous substrate (such as PTFE membrane) with a hydrophobic coating layer. This composite structure integrates the water-blocking capability of the hydrophobic surface with the sound-transmitting properties of the porous base material, achieving both waterproof performance and sound transmission efficiency
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 solution effectively maintains waterproof and sound-transmitting performance even under high water pressure, preventing deformation and sound loss, and ensuring stable sound transmission at pressures up to 5 atm.
Implementation Method 1
maintaining elasticity at a pressure of about 1 atm or more
Implementation Method 2
a reinforcement member having stiffness higher than that of the waterproof sound-transmitting layer
Implementation Method 3
a waterproof sound-transmitting layer formed of a film having elasticity
Implementation Method 4
sound-transmitting performance
Implementation Method 5
a first adhesive layer adhered to one surface of the waterproof sound-transmitting layer
Data Source
AI summary
A waterproof sound-transmitting sheet, which forms a reinforcement member on a waterproof sound-transmitting layer, thus maintaining waterproof performance and sound-transmitting performance by minimizing the displacement amount while maintaining stretch-shrinkage performance at a water pressure of about 1 atm or more. The waterproof sound-transmitting sheet may be configured to include a waterproof sound-transmitting layer formed in a film shape having elasticity, a first adhesive layer adhered to one surface of the waterproof sound-transmitting layer, a second adhesive layer adhered to the other surface of the waterproof sound-transmitting layer, and a reinforcement member formed of a hardening material to be formed on the waterproof sound-transmitting layer, thus maintaining waterproof and sound-transmitting performance by minimizing the displacement amount while maintaining stretch-shrinkage performance of the waterproof sound-transmitting layer even when a pressure of about 1 atm or more is applied thereto.