Waterproof Speaker Diaphragm Composite Resin Metal Mesh
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Solution Overview
Problem
Conventional waterproof structures for electronic devices, such as digital cameras, face challenges in maintaining good sound pressure while minimizing rattling noise due to deformation under water pressure, which can lead to persistent contact with internal components and noise generation.
Innovation Solution
A waterproof structure featuring a speaker unit with a vibrating sheet and an anti-rattle sheet, where the vibrating sheet is composed of a PET layer and a silicone rubber layer, providing adequate stiffness and flexibility to resist deformation and maintain sound pressure, and the anti-rattle sheet adjusts vibration characteristics to suppress self-resonance and rattling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat member is provided on the inside of a secondary diaphragm to improve water resistance, then the secondary diaphragm is supported under water pressure and less likely to be torn, but the secondary diaphragm may deform permanently under water pressure and come into contact with the flat member during vibration, generating rattle noise
Solution Approach 1:
The patent applies composite materials by combining a resin layer and a metal mesh layer to form a secondary diaphragm. The resin layer provides flexibility and vibration characteristics for good sound pressure, while the metal mesh layer provides tensile strength and stiffness to resist water pressure deformation. This composite structure resolves the contradiction by integrating both soft and hard material properties in a single component, eliminating the need for a separate flat member and preventing rattle noise.
2Reliability
If a material with high tensile strength is used for the secondary diaphragm to prevent deformation under water pressure, then the water resistance is improved, but the vibration amplitude is reduced and sound pressure is greatly lowered
Solution Approach 1:
The patent uses a composite structure where the resin layer provides the necessary flexibility and vibration characteristics for good sound pressure, while the metal mesh layer embedded within provides the tensile strength to resist water pressure. This allows the secondary diaphragm to maintain both acoustic performance and water resistance simultaneously.
Solution Approach 2:
The patent applies local quality by having different regions of the secondary diaphragm with different properties - the resin layer provides flexibility in areas requiring vibration, while the metal mesh layer provides strength in areas requiring water pressure resistance. This localized differentiation of material properties resolves the contradiction between sound pressure and water resistance.
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 ensures good sound pressure and reduces rattling noise by minimizing deformation and contact with internal components, enhancing water pressure resistance and maintaining sound quality even under pressure.
Implementation Method 1
the vibrating sheet is composed of a PET layer and a silicone rubber layer, providing adequate stiffness and flexibility to resist deformation
Implementation Method 2
the anti-rattle sheet adjusts vibration characteristics to suppress self-resonance and rattling
Data Source
AI summary
A waterproof structure for an electronic device is provided that includes a speaker, a housing, and a cover. The housing holds the speaker and includes at least one through-hole to transmit sound produced by the speaker. The cover includes a first sheet and a second sheet laminated to the first sheet. The stiffness of the second sheet is greater than the stiffness of the first sheet, and the cover is fixed to the housing to seal the at least one through-hole.