Dual-Pivot HMD Hinge Assembly for Lower User Torque
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Solution Overview
Problem
Head-mounted display (HMD) devices with hinges experience increased torque forces on the user due to the outward extension of the display device, which can impede natural movement and control, especially during activities like walking or running, as the center of mass moves further away from the head, affecting inertial response and comfort.
Innovation Solution
The implementation of single and double pivot hinge assemblies with adjustable mechanisms, including eccentric rotational brackets, friction mechanisms, and detent mechanisms, to balance the load and restrict angular movement, allowing for adjustable positioning of the head-up display relative to the user's eyes, and enabling secure stowed positions to reduce torque forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display device is extended outward from the head, then the line of sight and display positioning are improved, but torque forces on the user increase and natural movement is impeded
Solution Approach 1:
The patent introduces a counterweight mechanism that offsets the torque forces generated by extending the display device outward. By positioning mass in opposition to the display extension, the system balances the center of gravity, reducing the net torque on the user's head and improving comfort during movement while maintaining adequate line of sight positioning.
Solution Approach 2:
The hinge assembly incorporates dynamic adjustment capabilities that allow the display device positioning to adapt during movement. The mechanism enables real-time modification of the display angle and position in response to user movement, optimizing line of sight while dynamically managing torque forces through active repositioning rather than fixed extension.
2Ease of operation
If the display device is positioned further from the head, then viewing angle is improved, but inertial response deteriorates during movement
Solution Approach 1:
The counterweight mechanism not only balances torque but also compensates for inertial changes during movement. By positioning counterbalancing mass strategically, the system reduces the moment of inertia about the hinge axis, improving rotational responsiveness and stabilizing the display positioning during dynamic activities while maintaining optimal viewing angles.
Solution Approach 2:
The dynamic hinge mechanism actively adjusts display positioning in response to detected movement, optimizing the balance between viewing angle and inertial response. The system can shift the display position to maintain stability during rapid movements while maximizing viewing angle during stable periods, adapting to changing inertial conditions in real-time.
3Adaptability or versatility
If a hinge mechanism is used to move the display device, then positioning flexibility is improved, but mechanical complexity increases
Solution Approach 1:
The hinge assembly is segmented into distinct functional components: a pivot mechanism for angular adjustment, a counterweight subsystem for torque balancing, and a mounting interface for secure attachment. This segmentation allows each component to be optimized independently and facilitates easier assembly, maintenance, and adjustment while providing comprehensive positioning flexibility.
Solution Approach 2:
The hinge mechanism incorporates dynamic damping elements and friction control features that reduce the need for complex locking mechanisms. The dynamic characteristics of the hinge allow it to maintain positioning through controlled resistance rather than complex mechanical locks, simplifying the overall structure while preserving positioning flexibility and adaptability.
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 solution provides improved comfort and control by reducing torque forces on the user, allowing for a wider range of motion and secure positioning of the head-up display, maintaining light security and reducing the risk of damage from obstacles, while maintaining light security and reducing mechanical advantage.
Implementation Method 1
friction mechanisms
Data Source
AI summary
Examples are disclosed that relate to single and double pivot hinge assemblies for an HMD device. One example provides an HMD device comprising a wearable support configured to be worn on a head of a user. The HMD device further comprises a head-up display mounted to the wearable support by a hinge assembly. The hinge assembly comprises a mounting component connected to the wearable support, and a bar connected to the mounting component at a first pivot. The bar is further connected to the head-up display at a second pivot.