Foldable Hinge Arm Cam Structure for Stable Detent Load
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Solution Overview
Problem
Foldable electronic devices face challenges in maintaining a stable folding operation and folded state due to the weakness in display rigidity, which can lead to defects such as incomplete folding.
Innovation Solution
The implementation of an arm structure and a hinge structure that provide a specified detent load, utilizing a combination of rotating shafts, cam structures, and elastic bodies to maintain stability without increasing the device's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the display thickness is increased to improve rigidity and prevent stabbing, then the display strength is improved, but the repulsive force in the folded state increases which leads to defects in the folding operation
Solution Approach 1:
The patent introduces a hinge structure with cam mechanisms as an intermediary system between the display and the housing. The cam structures convert the repulsive force generated by the thick display into useful detent forces that stabilize the folding operation, transforming the harmful effect into a beneficial function for maintaining folding stability
Solution Approach 2:
The patent changes the mechanical parameters of the hinge system by introducing variable detent forces through cam mechanisms. The detent force is adjusted dynamically during the folding operation to compensate for the increased repulsive force from the thicker display, maintaining reliable folding operation despite the parameter change in display thickness
2Stability of the object's composition
If the display thickness is increased to provide rigidity, then the repulsive force increases, but the folding operation becomes unstable
Solution Approach 1:
The hinge structure with cam mechanisms acts as a mediator that translates the high repulsive force from the rigid thick display into controlled detent forces. This intermediary mechanism enables the system to maintain both display rigidity and folding operation stability by properly channeling the forces
Solution Approach 2:
The patent converts the harmful repulsive force generated by the thick rigid display into a beneficial detent force through the cam mechanism. The repulsive force that would normally cause folding instability is transformed into the driving force for the detent mechanism, stabilizing the folding operation
3Reliability
If a hinge structure is designed to provide detent load, then the folding stability is improved, but the device complexity increases
Solution Approach 1:
The hinge structure is segmented into multiple independent components including first and second cam structures, first and second cam members, and multiple elastic bodies. This segmentation allows each component to perform a specific function while maintaining overall simplicity and ease of assembly
Solution Approach 2:
The patent combines multiple functions into the hinge structure by integrating the detent mechanism, elastic force storage, and folding support into a single unified assembly. The cam structures and elastic bodies work together to provide both the detent load and the necessary mechanical support, reducing overall system complexity
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 solution ensures a stable folding operation and folded state of foldable electronic devices by providing a consistent detent load, enhancing the device's durability and preventing defects like incomplete folding.
Implementation Method 1
an elastic body, the elastic body being disposed between the cam member and at least one of the arm structure and the rotating part and to store energy
Data Source
AI summary
An arm structure of an electronic device is provided. The arm structure includes an arm body, a first cam disposed on one side of the arm body and including a first hole into which at least a portion of a rotating shaft providing a folding operation of the electronic device is inserted, a peak and a valley being formed around the first hole, a second cam arranged side-by-side on a same axis as the one side of the arm body, spaced apart from the first cam, and including a second hole into which at least a portion of the rotating shaft is inserted, a peak and a valley being formed around the second hole, and a connecting part disposed on another side of the arm body and fastened with a rotating part providing rotation of the electronic device.