Terminal Device Isolated Cavity Waterproofing
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Solution Overview
Problem
Terminal devices face issues with air leakage and poor waterproofing due to uneven surfaces on the main board, leading to sound quality degradation and potential damage from liquid exposure.
Innovation Solution
A terminal device design featuring a device housing with isolated inner cavities, where a speaker with a vibration piece, signal amplifier, and speaker body in a second inner cavity operates independently of the circuit board in a first inner cavity, using a vibration sound wave generation device to convert sound signals into vibrations, ensuring optimal dust-proof and water-proof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speaker is connected conductively to the main board through a spring plate and foam, then the speaker can receive electrical signals to produce sound, but the uneven surface of the main board causes gaps that lead to air leakage and liquid leakage
Solution Approach 1:
The device is divided into two isolated cavities: a first cavity containing the main board and circuit components, and a second cavity containing the speaker assembly. This segmentation physically separates the electrical wiring area from the speaker area, eliminating the need for complex wiring through foam and spring plates while preventing liquid and air leakage between cavities.
Solution Approach 2:
The speaker assembly is extracted from the main board area and placed in a separate second cavity. The wiring and electrical connections are taken out from the speaker area and confined to the first cavity, eliminating the harmful gaps created by wiring on the main board surface.
2Ease of operation
If wiring is designed on the surface of the main board to connect the speaker, then electrical signals can be transmitted, but the uneven surface creates gaps leading to air and liquid leakage
Solution Approach 1:
The device interior is segmented into two isolated cavities. The first cavity houses all wiring and electrical components on the main board, while the second cavity houses the speaker. This segmentation allows electrical signal transmission within the first cavity without creating gaps that would lead to air or liquid leakage into the speaker area.
Solution Approach 2:
A partition wall acts as an intermediary structure between the first and second cavities, providing a sealed barrier that prevents air and liquid leakage while allowing electrical signals to be transmitted through designated sealed connectors from the first cavity to the second cavity.
3Reliability
If liquid leaks into the terminal device through gaps, then the main board is prone to burnout and the spring plate contact position is prone to corrosion, but isolating cavities increases structural complexity
Solution Approach 1:
The device is segmented into two isolated cavities with a sealed partition wall between them. This segmentation creates a protective barrier that prevents liquid from reaching the main board and electrical components in the first cavity, eliminating the risk of burnout and corrosion while maintaining a relatively simple overall structure.
4Ease of manufacture
If the speaker sound cavity is formed by enclosing the main board with foam, then the speaker can be assembled, but wiring on the main board surface creates gaps that affect sound quality and waterproofing
Solution Approach 1:
The speaker assembly is segmented into a separate second cavity that is isolated from the main board area. This allows the speaker to be assembled with a uniform enclosing structure without the interference of main board wiring, improving both manufacturing ease and surface uniformity while maintaining waterproof integrity.
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 design maintains sound production while preventing foreign objects from entering the device housing, enhancing waterproofing and sound quality by isolating the speaker's inner cavities, thus protecting the terminal device from damage.
Implementation Method 1
the vibration sound wave generation device converts a sound signal from the sound signal processing module into a vibration signal, the vibration piece vibrates under the action of the vibration signal and generates an electrical signal
Data Source
Figure 1
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AI summary
In a terminal device disclosed in this disclosure, a device housing includes an installation space and a first inner cavity that are isolated from each other. A speaker is installed in the installation space. The speaker includes a speaker shell provided with a sound hole and a second inner cavity, and a vibrating piece, a signal amplifier, and a speaker body that are disposed in the second inner cavity. The first inner cavity and the second inner cavity are isolated from each other. A circuit board is installed in the first inner cavity. The circuit board is provided with a sound signal processing module and a vibration sound wave generation device. The vibration sound wave generation device is connected to the sound signal processing module. The vibration sound wave generation device converts a sound signal from the sound signal processing module into a vibration signal. The vibration piece vibrates under the action of the vibration signal and generates an electrical signal. The signal amplifier is connected to the vibration piece and amplifies the electrical signal, and the speaker body is connected to the signal amplifier and produces sound based on the amplified electrical signal through the sound hole.