Foldable Hinge Module With Opposed Springs for Pen Field Accuracy
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Solution Overview
Problem
In foldable electronic devices, the repeated folding and unfolding operations lead to static electricity accumulation in the hinge device, causing a magnetic field that magnetizes metal structures and impairs the uniformity of the digitizer's H-field, resulting in reduced accuracy of electronic pen inputs.
Innovation Solution
The hinge device incorporates coil spring members coiled in opposite directions to offset magnetic fields and eliminate static electricity, maintaining H-field uniformity and improving pen input accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coil spring members are used to support hinge operations and prevent wear, then reliability is improved, but static electricity accumulates causing magnetic field interference that deteriorates measurement precision
Solution Approach 1:
The patent utilizes the magnetic field generated by coil spring members coiled in opposite directions to cancel each other out, converting the harmful magnetic field interference into a beneficial neutralization effect. This allows the coil springs to maintain their mechanical function while eliminating their adverse magnetic impact on the digitizer
Solution Approach 2:
The patent changes the coiling direction parameter of the coil spring members from a uniform direction to opposite directions. This parameter change fundamentally alters the magnetic field generation characteristics, causing the magnetic fields to oppose and cancel each other, thereby resolving the interference problem while maintaining mechanical reliability
2Strength
If metal structures are used in the hinge device to increase rigidity, then strength is improved, but friction generates static electricity that creates magnetic field interference
Solution Approach 1:
The patent converts the harmful static electricity generation from metal friction into a controlled magnetic field neutralization system by using coil springs with opposite coiling directions, where the magnetic fields cancel each other out, transforming a harmful effect into a neutral or beneficial outcome
Solution Approach 2:
The coil spring members act as an intermediary between the metal structures and the digitizer, providing mechanical support while their opposite coiling configurations create opposing magnetic fields that cancel the harmful static electricity effects before they can interfere with the digitizer
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 configuration reduces magnetization and maintains H-field uniformity, enhancing the accuracy of electronic pen inputs by eliminating static-induced magnetic interference.
Implementation Method 1
The coil spring members of the hinge device may at least partially generate a magnetic field based on the accumulated static electricity
Implementation Method 2
The at least two coil spring members may be coiled in opposite directions with respect to the folding axis
Data Source
AI summary
According to an embodiment, an electronic device may include a first housing, a second housing, a hinge device configured to connect the first housing and the second housing to be foldable about a folding axis, and a flexible display arranged to be supported by at least a part of the first housing, the second housing, and the hinge device. The hinge device may include a hinge housing including an accommodation portion, at least one cam assembly arranged in the accommodation portion, at least two coil spring members providing a pressing force to the at least one cam assembly in a direction parallel to the folding axis, and at least one hinge plate configured to support the at least one cam assembly. The at least two coil spring members may be coiled in opposite directions. Various other embodiments may be possible.