Waterproof Sheet Bonding for Mobile Terminal Sealing
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Solution Overview
Problem
Conventional waterproofing structures for mobile terminals using O-rings are inefficient due to manual connection requirements, variability in manufacturing speed, increased thickness, high costs, and limitations in design and manufacturing quality, as well as vulnerability to external shocks and foreign substance ingress.
Innovation Solution
A mobile terminal with a waterproof sheet and a bonding member, where the waterproof sheet is configured to match the dimensions, shape, function, and material of components, and is connected using a bonding member to encase components while allowing for heat dissipation and flexibility in design, reducing the need for manual assembly and minimizing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an O-ring is used as a waterproofing structure, then waterproofing function is achieved, but manufacturing efficiency decreases due to manual connection requirements
Solution Approach 1:
The patent replaces the mechanical O-ring waterproofing system with a bonding member-based system. The bonding member is integrated into the groove structure and bonds directly to the casing surface, eliminating the need for manual O-ring insertion and mechanical compression. This substitution enables automated assembly while maintaining waterproofing effectiveness through chemical bonding rather than mechanical deformation.
2Reliability
If an O-ring is used for waterproofing, then gap sealing is achieved, but thickness of the terminal increases
Solution Approach 1:
The bonding member is designed as a thin film structure that conforms to the groove geometry. Instead of using a thick, compressible O-ring, the bonding member provides sealing through a thin adhesive layer that bonds the groove to the casing surface. This thin-film approach maintains effective gap sealing while minimizing thickness increase, allowing the terminal to remain slim.
3Reliability
If an O-ring is used for waterproofing, then water blocking is achieved, but manufacturing cost increases
Solution Approach 1:
The bonding member integrates multiple functions into a single component: it provides structural bonding between the groove and casing, creates the waterproof seal, and eliminates the need for separate O-ring parts. This merging of sealing and bonding functions into one integrated element reduces the number of components, simplifies the bill of materials, and lowers manufacturing costs compared to using separate O-rings and adhesives.
4Reliability
If an O-ring is used for waterproofing, then protection from water is achieved, but design flexibility is limited due to irregular groove shapes requiring manual connection
Solution Approach 1:
The bonding member's adhesive properties enable it to conform to various groove geometries and surface conditions. By utilizing the chemical bonding parameters of adhesives (viscosity, cure time, bond strength), the system can adapt to irregular groove shapes and different casing materials without requiring precise manual positioning. This parameter-based adaptability allows for greater design flexibility in groove configuration and terminal assembly.
Data Source
AI summary
A mobile terminal has a waterproof sheet interposed between a first body portion and a second body portion. The waterproof sheet is formed with a curved shaped or step-like cross-section in consideration of characteristic of internal component or a battery arranged on the first body portion of the mobile terminal, the curved shaped or step-like cross-section is configured to encase, in part or in whole, the internal component or the battery.