Biaxial Hinge Torque Structure for Thin Low-Vibration Electronics
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Solution Overview
Problem
Existing hinge mechanisms in electronic devices require larger diameters to generate sufficient rotational torque, leading to manufacturing difficulties and potential vibration issues.
Innovation Solution
A hinge device with a biaxial structure that includes a first shaft and a second shaft, connected by a synchronization unit and torque application units, applying frictional forces to generate rotational torque without needing large diameters, thereby reducing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a leaf spring is used to generate rotational torque, then sufficient torque can be generated, but a larger diameter is required which prevents further thinning of the electronic apparatus
Solution Approach 1:
The hinge device is divided into two independent torque application units: a first torque application unit that applies frictional force to the peripheral surface of the first shaft, and a second torque application unit that applies frictional force to the second shaft in the axial direction. This segmentation allows each unit to contribute to torque generation independently, enabling sufficient total torque with smaller individual component dimensions.
Solution Approach 2:
The first torque application unit utilizes the peripheral surface of the first shaft (circumferential dimension), while the second torque application unit utilizes the axial direction of the second shaft. By applying frictional forces in different dimensional orientations, the patent achieves torque generation without requiring increased diameter in any single dimension.
2Force
If a curled bracket is used to generate rotational torque, then torque can be generated, but the curled portion must be long in the axial direction with high straightness requirements making manufacturing difficult
Solution Approach 1:
The patent replaces the mechanical curled bracket mechanism with a friction-based torque application system. Instead of relying on elastic deformation of a curled portion, the invention uses frictional forces between the torque application units and the shafts to generate rotational torque. This substitution eliminates the need for complex curled structures with high straightness requirements, significantly improving manufacturability.
3Force
If a curled bracket is used to generate rotational torque, then torque can be generated, but vibration is likely to occur between the two chassis
Solution Approach 1:
The patent replaces the elastic curled bracket mechanism with a friction-based torque application system. The frictional forces in the torque application units provide stable torque generation without the elastic deformation that causes vibration in curled bracket systems, thereby eliminating the harmful vibration between chassis.
4Force
If a larger diameter is used in the hinge device, then sufficient rotational torque can be generated, but the electronic apparatus cannot be further thinned
Solution Approach 1:
The hinge device is segmented into two torque application units that work together to generate sufficient torque without requiring a large overall diameter. This segmentation allows the torque generation function to be distributed across multiple smaller components, enabling thinning of the electronic apparatus while maintaining adequate torque output.
Solution Approach 2:
The patent utilizes different dimensional orientations for torque application: the first torque application unit acts on the peripheral surface (circumferential dimension) of the first shaft, while the second torque application unit acts on the second shaft in the axial direction. This multi-dimensional approach to torque generation allows sufficient torque with reduced diameter requirements, enabling further thinning of the electronic apparatus.
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
The hinge device generates sufficient torque with a smaller diameter, minimizing vibration and facilitating easier manufacturing, while maintaining stability and smooth operation across various angular positions.
Implementation Method 1
a first torque application unit configured to apply a frictional force to a peripheral surface of the first shaft by fitting the first shaft to the first torque application unit
Implementation Method 2
a second torque application unit configured to apply a frictional force to the second shaft in an axial direction
Data Source
AI summary
A hinge device includes a first shaft that is fixed to a display chassis, a second shaft that is fixed to a main body chassis, connecting plates to which the first shaft and the second shaft are rotatably fitted, a synchronization unit configured to synchronously rotate the first shaft and the second shaft in opposite directions with respect to the connecting plates, a first torque application unit configured to apply a frictional force to a peripheral surface of the first shaft by fitting the first shaft to the first torque application unit, and a second torque application unit configured to apply a frictional force to the second shaft in an axial direction.