Multipole Magnet Hinge for Stable Case Lid Positioning
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Solution Overview
Problem
Existing portable electronic device cases lack a stable and efficient mechanism for maintaining the lid in open or closed positions, often resulting in instability and unintended movement.
Innovation Solution
The use of multipole magnets with radially arranged magnetic sections, where the first magnet is coupled to the lid and the second magnet is coaxially attached to the housing, creating a biased rotational torque that stabilizes the lid in either the open or closed position through magnetic interactions, providing discrete stable orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical hinges are used to couple the lid to the housing, then the structure is simple and easy to manufacture, but the lid becomes unstable between open and closed positions and may move unintentionally
Solution Approach 1:
The patent replaces traditional mechanical hinge components (springs, detents, cam mechanisms) with a magnetic field-based system. Two multipole magnets are positioned such that their interacting magnetic fields create stable equilibrium positions at open and closed states, eliminating the need for complex mechanical elements while achieving reliable position holding.
Solution Approach 2:
The patent utilizes changes in magnetic field interaction parameters (distance, orientation, pole alignment) to create discrete stable positions. By adjusting the relative positioning and orientation of the multipole magnets, the system achieves controlled stable states at specific lid angles without mechanical intervention.
2Reliability
If magnetic components are added to stabilize the lid position, then position stability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent integrates the magnetic hinge components directly into the existing hinge assembly structure. The multipole magnets are positioned within or adjacent to the mechanical hinge components, combining magnetic and mechanical functions in a unified assembly that leverages existing manufacturing processes while adding magnetic stabilization.
Solution Approach 2:
The multipole magnets serve multiple functions simultaneously: they provide positional stability at open and closed states, guide the lid through intermediate positions, and work cooperatively with the mechanical hinge structure. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process.
3Ease of operation
If the lid is allowed to rotate freely between open and closed positions, then ease of operation improves, but the lid becomes unstable and may remain in unintended positions
Solution Approach 1:
The magnetic field interaction between the two multipole magnets creates self-stabilizing forces that automatically guide the lid to stable equilibrium positions. The system uses its own magnetic field energy to provide restoring torques that return the lid to stable positions (open or closed) after disturbance, without external control or additional actuation mechanisms.
Solution Approach 2:
The magnetic field interaction provides continuous positional feedback through varying magnetic forces and torques. As the lid rotates, the changing relative orientation between the multipole magnets generates restoring forces that guide the lid toward stable equilibrium positions, creating a self-correcting system that maintains position stability.
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 ensures the lid remains in the desired position, enhancing the usability and durability of the case by maintaining stability between open and closed states, reducing mechanical stress and improving user interaction.
Implementation Method 1
Due to an interaction between respective magnetic fields of the first and second multipole magnets, the lid is unstable between the open and closed positions
Implementation Method 2
respective magnetic poles on the first and second multipole magnets are oriented to attract each other
Implementation Method 3
respective magnetic poles on the first and second multipole magnets are oriented to repel each other
Data Source
AI summary
A case for a portable electronic device includes a housing, a lid, and a hinge rotatably coupling the lid to the housing such that the lid is operable between an open position and a closed position. The hinge includes a first multipole magnet coupled to the lid such that the first multipole magnet rotates with the lid. A second multipole magnet is coupled to the housing and is arranged coaxially with the first multipole magnet and such that the first multipole magnet and the lid rotate relative to the second multipole magnet. The lid is unstable between the open and closed positions, such that, between the open position and the closed position, the lid is biased toward either the open position or the closed position depending on an angle of orientation of the lid relative to the housing.