Foldable Hinge Cam Structure for Easier Closed-State Release
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Solution Overview
Problem
Foldable electronic devices require excessive force to open when in a closed state, making it difficult for users to open with one hand and potentially damaging the display due to high pressure application.
Innovation Solution
A hinge structure with a rotary cam and fixed cam mechanism, including an additional structure between the stopper and fixed cam, reduces the pressure needed to open the device by adjusting the torque and contact states between cam components, allowing easier release of the closed state with minimal force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cam structure with elastic member is used to maintain closed state, then the closed state is maintained reliably, but excessive force is needed to open the device
Solution Approach 1:
The cam structure is divided into multiple segments: a first cam structure with a first elastic member for initial state maintenance, and a second cam structure with a second elastic member for assisted opening. This segmentation allows the opening action to be distributed across multiple mechanical advantages, reducing the peak force required at any single point.
Solution Approach 2:
A pressing member is introduced as an intermediary element between the user's input force and the cam structures. This pressing member translates the user's pressing action into coordinated movement of both cam structures simultaneously, enabling efficient force transmission and reducing the direct force burden on the display assembly.
2Ease of operation
If excessive force is applied to open the device, then the closed state can be released, but damage to the display may occur
Solution Approach 1:
The pressing member serves as a protective intermediary that distributes and controls the opening force. By mediating between the user's action and the rigid cam structures, it prevents concentrated force from being transmitted directly to the flexible display, thereby avoiding damage while still achieving reliable state transition.
Solution Approach 2:
The dual cam structure with elastic members provides a cushioning effect during the opening transition. The elastic members deform and absorb excess energy, preventing sudden force spikes that could damage the display. This cushioning action occurs automatically during the opening sequence, protecting the display before damage can occur.
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
Enables the foldable electronic device to be opened with reduced pressure, protecting the display and allowing effortless one-handed operation by modifying the torque and contact states within the hinge mechanism.
Implementation Method 1
uses an elastic member in relation to the cam structure for generation of an elastic force (or a frictional force) for cam operation
Implementation Method 2
uses an elastic member in relation to the cam structure for generation of an elastic force (or a frictional force) for cam operation
Data Source
AI summary
Disclosed is a foldable electronic device including a flexible display, a first housing and a second housing, a hinge housing, and a hinge structure. The hinge structure includes a first rotary member coupled to the first housing, a second rotary member coupled to the second housing, a first arm part coupled to the first rotary member and including a first rotary cam, a second arm part coupled to the second rotary member and including a second rotary cam, a fixed cam part including a first fixed cam engaged with the first rotary cam, a second fixed cam engaged with the second rotary cam, and a cam body connecting the first fixed cam and the second fixed cam, a stopper that restricts rotational angles of the arm parts, and an additional structure disposed between the stopper and the fixed cam part.