Helmet Display Screw Adjustment Mechanism for Angular Precision
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Solution Overview
Problem
Current helmet-mounted display systems face challenges in achieving accurate and reliable alignment of synthetic images with the real world due to insufficient rigidity in mechanical structures and adjustments, which are bulky, heavy, and require frequent recalibration, especially when considering anthropometric variations and helmet deformations during flight.
Innovation Solution
A helmet-mounted display system featuring a mechanical arch with a screw-spring assembly for vertical adjustment and a knurled screw with a spherical end for roll adjustment, allowing for precise and independent vertical and lateral adjustments, along with a magnetization-based locking system for secure positioning, ensuring accurate overlay without the need for mechanical or optical realignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If slides driven by knurled screws are used for vertical and horizontal adjustments, then adjustment capability is provided, but weight and bulk increase significantly
Solution Approach 1:
The patent extracts the adjustment function from complex mechanical slides and concentrates it into a single knurled screw mechanism that provides both vertical and horizontal adjustment through one component, reducing overall weight and bulk while maintaining full adjustment capability
Solution Approach 2:
The knurled screw assembly serves multiple functions simultaneously: it provides vertical adjustment through thread engagement, horizontal adjustment through lateral movement, and positioning retention through friction hold, replacing what would traditionally require separate mechanisms for each degree of freedom
2Ease of operation
If slides are used for adjustment, then position adjustment is possible, but rigidity and accuracy deteriorate due to play and flexibility
Solution Approach 1:
The knurled screw features a spherical head that engages with a corresponding spherical seat, creating a point-contact pivot that eliminates lateral play while allowing rotational adjustment. This spherical geometry provides both adjustment range and high positional accuracy by preventing unwanted degrees of freedom
Solution Approach 2:
The patent replaces flexible slide mechanisms with a rigid screw-thread and spherical pivot system that provides precise mechanical advantage and repeatable positioning, eliminating the play and flexibility inherent in slide-based adjustment mechanisms
3Weight of moving object
If the display device is made lightweight and compact, then comfort and ease of incorporation improve, but adjustment mechanisms become insufficient
Solution Approach 1:
The adjustment mechanism is nested within the compact display device structure, with the knurled screw integrated into the housing and the combiner mount. This nested arrangement provides full adjustment capability within a minimal volume, maintaining lightweight and compact form factor while ensuring adaptability to different user requirements
Data Source
AI summary
A helmet-mounted display systems includes a front mechanical arch comprising a display device and a means for holding and adjusting the display device in the vertical plane, the means consisting of a first vertical support surface comprising an oblong port and a screw/spring assembly, the screw passing through the oblong port and being fastened in a mechanical structure of the display device, the display device being capable of rotating in such a way as to make it retractable. The display system comprises a means for roll adjustment and repositioning of the display device, the adjustment means consisting of a second vertical support surface, normal to the first support surface, and a knurl screw attached to the mechanical structure of the display device, the end of the screw resting on the second support surface when the display device is in the use position.