Waterproof Sound Membrane with Dual Adhesive Support
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Solution Overview
Problem
As electronic devices become smaller and lighter, the risk of sagging waterproof sound transmitting membranes coming into contact with transducers and other components increases, leading to potential sound quality deterioration, especially with larger diameter membranes.
Innovation Solution
A waterproof sound transmitting member is designed with a waterproof sound transmitting membrane and two adhesive sheets, where the first adhesive sheet forms a closed frame and the second adhesive sheet is disposed within this frame, ensuring the membrane is securely attached to the housing and preventing sagging, while allowing sound transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single adhesive sheet is used to fix the waterproof sound transmitting membrane, then the membrane can be attached to the housing, but the membrane sags under its own weight and comes into contact with transducer components, resulting in sound distortion
Solution Approach 1:
The single adhesive sheet is divided into two separate adhesive sheets: a first adhesive sheet that fixes the membrane to the housing, and a second adhesive sheet that supports the membrane from the interior side to prevent sagging. This segmentation allows each adhesive sheet to perform its specific function independently, preventing sound distortion while maintaining manufacturing simplicity.
Solution Approach 2:
The second adhesive sheet acts as an intermediary element between the waterproof sound transmitting membrane and the interior space of the housing. It provides additional support to the membrane, preventing it from sagging and contacting the transducer, thereby protecting sound quality without interfering with the primary fixing function of the first adhesive sheet.
2Area of stationary object
If the waterproof sound transmitting membrane has a large diameter to cover the opening, then waterproofness is improved, but the membrane is more likely to sag and contact surrounding components
Solution Approach 1:
The fixing system is segmented into two adhesive sheets positioned at different locations. The first adhesive sheet at the edge provides primary fixation, while the second adhesive sheet positioned more centrally provides support against sagging. This segmented approach allows large-diameter membranes to maintain both waterproof coverage and structural stability.
Solution Approach 2:
Different regions of the membrane are provided with different levels of support through the two adhesive sheets. The first adhesive sheet secures the edge region for waterproof sealing, while the second adhesive sheet supports the central region to prevent sagging. This local differentiation of support quality allows the membrane to maintain both large coverage area and sound quality.
3Weight of moving object
If electronic devices are made smaller and lighter, then device size and weight are reduced, but the risk of membrane sagging causing sound quality deterioration increases
Solution Approach 1:
The two-adhesive-sheet fixing system provides distributed support that is particularly effective in small, lightweight devices where membrane weight-to-area ratio is higher. The segmentation allows the membrane to be securely fixed without requiring additional heavy structural support, maintaining device lightness while preventing sagging-induced sound distortion.
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
This configuration effectively prevents sagging of the membrane, reducing the risk of sound distortion and maintaining sound quality by ensuring the membrane does not come into contact with surrounding components, particularly beneficial for smaller and lighter electronic devices with larger diameter membranes.
Implementation Method 1
a first adhesive sheet and a second adhesive sheet that are disposed on the first surface
Implementation Method 2
a waterproof sound transmitting membrane that allows sound to pass therethrough and prevents water from passing therethrough
Data Source
AI summary
A waterproof sound transmitting member according to the present invention includes: a waterproof sound transmitting membrane having a first surface and a second surface opposite to the first surface; and a first adhesive sheet and a second adhesive sheet that are disposed on the first surface. When viewed in a direction perpendicular to the first surface, the first adhesive sheet has a closed frame shape, and the second adhesive sheet is disposed within the frame formed by the first adhesive sheet and is spaced from the first adhesive sheet. This waterproof sound transmitting member has a structure suitable for preventing deterioration in sound quality due to sagging of the waterproof sound transmitting membrane.