Barometer Waterproofing via Segmented Film and Active Valve
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Solution Overview
Problem
Existing mobile phone terminals with internal barometers face challenges in achieving both water-proof and air permeability, with IPX5 ratings failing to meet water-proof requirements when submerged and IPX7 ratings compromising real-time height measurement due to poor air permeability.
Innovation Solution
A water-proof structure with a barometer inside the terminal device, featuring a dust-proof net, a water-proof mesh net, a water drop detection device, and a control valve that closes upon detecting a certain water volume, ensuring both air permeability and water-proofing by using ferromagnetic clapboards, electromagnets, or piezoelectric ceramic pieces to seal the barometer opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IPX7 water-proof rating is employed with high water-proof performance film, then water-proof effect is improved, but air permeability deteriorates resulting in delay in barometric pressure transmission
Solution Approach 1:
The water-proof film is segmented into multiple regions: a first region with first aperture and a second region with second aperture. This segmentation allows different parts of the film to serve different functions - one region prioritizes water-proofing while the other prioritizes air permeability for barometric pressure transmission.
Solution Approach 2:
Different regions of the water-proof film are designed with different aperture characteristics. The first region has specific aperture properties for water resistance, while the second region has aperture properties optimized for air permeability. This local quality differentiation resolves the contradiction between water-proofing and barometric pressure transmission.
2Productivity
If IPX5 water-proof rating is employed, then air permeability is maintained, but water-proof requirements are not met when terminal device falls into water
Solution Approach 1:
The water-proof film is divided into functional regions where the first region provides IPX5-level air permeability while the second region enhances water-proof performance. This segmentation allows the device to meet higher water-proof requirements while maintaining sufficient air permeability for barometric pressure transmission.
Solution Approach 2:
The water-proof film functions as a composite structure with different regions having different properties. This composite design enables the film to simultaneously achieve improved water-proof rating and adequate air permeability, resolving the contradiction between these two requirements.
3Reliability
If water-proof mesh net is added between dust-proof net and barometer, then water-proof performance is improved, but device complexity increases
Solution Approach 1:
The water-proof mesh net is integrated with the dust-proof net and water-proof film to form a combined protective structure. This merging approach provides enhanced water-proof performance while minimizing the increase in device complexity by consolidating multiple protective functions into an integrated system.
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 provides a balance between maintaining barometric pressure communication and achieving an IPX7 water-proof rating, preventing damage when submerged, while ensuring real-time height measurement sensitivity.
Implementation Method 1
the water drop detection device is electrically connected to the control valve
Implementation Method 2
the control valve includes two ferromagnetic clapboards and an electromagnet, where the two ferromagnetic clapboards are symmetrically fixed on an inner cavity wall of the internal cavity, and the electromagnet is arranged on the same side as the two ferromagnetic clapboards
Implementation Method 3
the piezoelectric ceramic piece is electrically connected to the water drop detection device, so that when receiving an electric signal from the water drop detection device, the piezoelectric ceramic piece deforms elastically and contacts the two cavity wall protrusions to achieve sealing
Data Source
Figure 1~2
Figure 3~3.1
Figure 4~4.1
AI summary
The present invention provides a water-proof structure provided with an internal barometer for a terminal device and a control method, relates to the field of terminal devices, and solves the water-proof and air permeability problems of a terminal device in the water-proof structure provided with an internal barometer for a terminal device, the water-proof structure is an internal cavity of the terminal device, the water-proof structure is provided with an opening on a casing of the terminal device so that a barometric pressure inside the water-proof structure is communicated with an external barometric pressure, a barometer is arranged inside the water-proof structure, a dust-proof net is arranged between the opening and the barometer, and a water-proof mesh net is arranged between the dust-proof net and the barometer; a water drop detection device is arranged between the water-proof mesh net and the barometer, and a control valve is arranged between the water drop detection device and the barometer; and the water drop detection device is electrically connected to the control valve, and when a water volume detected by the water drop detection device reaches a water volume threshold value, the control valve is closed. The present invention is applicable to various types of terminals.