Headset Eye Relief Mechanism With Bevel Gear Screw Adjustment
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Solution Overview
Problem
Conventional VR headsets lack an efficient mechanism for adjusting the eye-to-lens distance, which is crucial for ensuring a high-quality immersive experience.
Innovation Solution
An adjustment mechanism featuring an adjustment wheel with an internal bevel gear ring, a pinion gear, and a screw, allowing for precise adjustment of the forehead pad and lens distance through a 3:1 gear ratio and 10-degree axis inclination, enabling efficient packaging and high mechanical advantage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional adjustment mechanism is used, then the structure is simple, but the mechanical advantage is low requiring many turns for adjustment
Solution Approach 1:
A pinion gear is introduced as an intermediary component between the adjustment wheel and the threaded member. The pinion gear meshes with both the adjustment wheel's bevel gear ring and engages with the threaded member, creating a compound gear system that multiplies mechanical advantage while maintaining a compact structure.
Solution Approach 2:
The adjustment mechanism employs a nested configuration where the pinion gear is positioned within the adjustment wheel assembly, and the threaded member passes through the pinion gear. This nested arrangement allows multiple functional components to occupy overlapping spatial volumes, achieving high mechanical advantage without increasing the overall device footprint.
2Volume of moving object
If the adjustment mechanism components are closely packaged, then the device size is reduced, but clearance for other components is limited
Solution Approach 1:
The adjustment wheel incorporates a bevel gear ring with teeth oriented at an angle rather than parallel to the adjustment axis. This angular orientation allows the pinion gear to mesh at an inclined angle, effectively utilizing three-dimensional space and creating clearance pathways for optical components to pass through the adjustment wheel assembly without interference.
Solution Approach 2:
The adjustment wheel is designed with an open structure featuring radial spokes rather than a solid disk, creating segmented passages through the wheel. These passages allow optical components and other internal elements to pass through the adjustment wheel assembly, enabling efficient packaging while maintaining necessary clearances for the optical rail and other components.
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 mechanism provides a high degree of mechanical advantage, allowing for easy and precise adjustment of the eye-to-lens distance with minimal turns, while maintaining efficient component packaging and clearance from the main optical rail.
Implementation Method 1
an internal bevel gear ring configured to rotate about a first axis; a pinion gear meshed with the internal bevel gear ring and configured to rotate about a second axis, in response to the internal bevel gear ring being rotated about the first axis
Implementation Method 2
a screw fixed to the pinion gear and configured to rotate together with the pinion gear to move a forehead pad of the headset display device
Data Source
AI summary
Aspects of the present disclosure are directed to an adjustment mechanism for adjusting an eye-to-lens distance of a headset display device. The adjustment mechanism can include an adjustment wheel that is rotatable by a user, a pinion gear fixed to a screw, and a threaded member receiving the screw and mounted to a forehead pad frame supporting a forehead pad. The adjustment wheel can include an internal bevel gear ring. The pinion gear is rotated by rotation of the internal bevel gear ring, and the screw rotates with the pinion gear. The pinion gear and the screw can rotate about a second axis. The threaded member moves along the screw, as the screw rotates, to move the forehead pad to adjust the eye-to-lens distance. The internal bevel gear ring, the pinion gear, and the screw are configured to allow additional components to pass through an interior of the adjustment wheel.