Portable Device Metal Resin Composite Casing Rigidity
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Solution Overview
Problem
Existing casing structures for portable devices with display units face challenges in achieving a smaller, thinner profile while ensuring strength, as they require increased thickness or complex designs due to limitations in resin and metal materials, bonding methods, and load resistance.
Innovation Solution
A portable device design featuring a metal structure with a bottomed concave shape and contiguous side walls, integrated with a framed-shaped resin casing, providing increased rigidity and protection through a combination of metal and resin components, with a rib structure and elastic resin molding to minimize deformation and maintain thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of resin casing walls is increased to ensure strength, then the strength of the casing is improved, but the device thickness increases and cannot meet smaller, thinner profile requirements
Solution Approach 1:
The patent uses a composite structure combining resin and metal materials. The resin casing provides corrosion resistance and design flexibility, while embedded metal reinforcement elements (such as metal frames or metal inserts) provide the necessary strength and rigidity. This allows the casing to maintain sufficient strength without increasing overall thickness, as the metal components are integrated within the resin structure rather than requiring thicker resin walls.
2Strength
If a metal frame is used to ensure sufficient strength, then the strength is improved, but the frame member thickness and connecting regions limit how smaller and thinner the profile can be made
Solution Approach 1:
The patent embeds metal reinforcement elements within the resin casing structure. The metal components are nested inside or integrated with the resin casing, allowing the metal strength to be utilized without adding external frame thickness. The metal elements are positioned strategically within the resin matrix to provide reinforcement where needed while maintaining a thin overall profile.
Solution Approach 2:
The patent applies metal reinforcement selectively at specific locations within the casing structure rather than using a complete metal frame. The metal elements are placed in regions requiring additional strength (such as corners, edges, or areas subject to stress), allowing the majority of the casing to remain thin resin while providing targeted reinforcement where mechanically necessary.
3Strength
If adhesive bonding is used to join resin and metal components, then the bonding strength is improved, but the required adhesive surface area impedes achieving a smaller, thinner profile
Solution Approach 1:
The patent eliminates or minimizes the need for adhesive bonding by directly integrating metal reinforcement elements into the resin casing during the molding process. The metal components are embedded within the resin matrix, creating a mechanically interlocked structure that does not rely on adhesive surfaces. This removes the constraint of requiring large adhesive bonding areas while maintaining strong structural integrity.
Data Source
AI summary
A metal structure that holds a display unit, as the main structure, and a casing structure that is integrally molded from resin onto the metal structure. The metal structure is resilient against flexural loads, torsional loads, and other deformations from the exterior upon the display unit composed of thin plate glass, because the member that protects the display unit is in a box shape. The display unit itself can be protected from damage even if rigidity is reduced because of a thinner profile. The metal structure is manufactured by thin plate pressing and sufficient strength can be maintained even if the thickness is low. Furthermore, the metal structure is configured as a frame part of the entire casing, the rigidity of the entire device can therefore be maintained by using this structure, and the mounting board and functional components other than the display unit can also be protected.