Waterproof Microspeaker Diaphragm Housing Design
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Solution Overview
Problem
Existing waterproof microspeakers face challenges in achieving both improved waterproof functionality and reduced thickness, with existing designs being limited by the thickness of the plastic top portion and the potential impact of adhesive application on waterproof performance.
Innovation Solution
The design incorporates a diaphragm housing with a sidewall portion, an edge dome portion, and a waterproof ring portion, where the diaphragm is a thin plate made of polymeric material with metal or plastic content, inserted into the edge dome portion, enhancing waterproof performance and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plastic top portion is used with predetermined thickness to ensure strength and injection moldability, then the structural strength is improved, but the overall thickness of the microspeaker cannot be reduced
Solution Approach 1:
The patent replaces the rigid plastic top portion with a flexible silicone rubber membrane that can be made extremely thin (0.02mm to 0.2mm). This flexible membrane maintains sufficient strength through its material properties rather than thickness, enabling the microspeaker to achieve water resistance while maintaining a thin overall profile.
Solution Approach 2:
The patent uses composite construction by combining the flexible silicone rubber membrane with a plastic support structure. The silicone rubber provides flexibility and water resistance with minimal thickness, while the plastic support provides structural reinforcement, achieving both thinness and strength through material composition rather than increased thickness.
2Ease of manufacture
If adhesive is applied to bond the top portion to the vent ring portion, then the assembly is secured, but waterproof performance is affected by adhesive application amount, position, and pressure
Solution Approach 1:
The patent removes the adhesive bonding step entirely from the assembly process. Instead of bonding components together, the silicone rubber membrane is mechanically integrated with the plastic support through injection coupling, eliminating the variable and unreliable adhesive layer that compromised waterproof performance.
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesive) with a mechanical integration mechanism (injection coupling). The plastic support is injection-coupled directly to the silicone rubber membrane, creating a reliable mechanical bond that is independent of adhesive application variables and ensures consistent waterproof performance.
3Length of stationary object
If the diaphragm is made as a thin plate to reduce thickness, then the overall thickness is reduced, but the installation space for the diaphragm decreases and magnet size must increase
Solution Approach 1:
The patent addresses the space constraint by creating a three-dimensional edge dome structure that protrudes from the diaphragm housing. This edge dome provides vertical clearance and lateral space for the thin diaphragm to be properly installed and secured, effectively adding dimensional space without increasing the overall footprint or requiring larger magnets.
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 increases the size of the magnet while reducing the installation space of the diaphragm, enhances the bonding force between the edge dome and the diaphragm, and improves the overall performance of the microspeaker under high water pressure.
Implementation Method 1
a voice coil located between the inner magnet and the outer magnet and vibrated by a magnetic field of the magnetic circuit and mutual electromagnetic force when an electric signal is applied
Implementation Method 2
a diaphragm provided inside the edge dome, allowing an upper end of the voice coil to be fixed thereto, and generating sound by vibration of the voice coil
Data Source
AI summary
A waterproof microspeaker includes: a frame; a magnetic circuit provided below the frame and including a yoke, inner and outer magnets, and a top plate; a voice coil located between the magnets and configured to vibrate by a magnetic field of the magnetic circuit and mutual electromagnetic force when an electric signal is applied; and a diaphragm housing provided above the frame. The diaphragm housing includes: a sidewall portion provided above the frame and having a predetermined height; an edge dome portion protruding upwardly or downwardly along an inner circumference of the sidewall portion; and a diaphragm provided inside the edge dome, allowing an upper end of the voice coil to be fixed thereto, and configured to generate sound by vibration of the voice coil. The diaphragm includes a polymeric material including metal or plastic and is inserted into an inner circumferential portion of the edge dome portion.