Quick Adjustment Mechanism for Head-Mounted Displays
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Solution Overview
Problem
Conventional head and helmet mounted displays (HMDs) are difficult and time-consuming to adjust due to complex mechanisms and non-intuitive interfaces, requiring multiple steps and often necessitating a technician for proper alignment, which is not accommodating for anthropometric variability among users.
Innovation Solution
A quick adjustment assembly with an eye relief assembly and interpupillary distance (IPD) adjustment mechanism that allows for three-degrees of freedom movement, featuring an adjustment plate with pressure plate assemblies and IPD rail assembly, enabling users to adjust the HMD vertically, tilt, and IPD in 15 seconds or less with an intuitive interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional adjustment mechanisms are used, then positioning accuracy is improved, but adjustment time and complexity increase significantly
Solution Approach 1:
The patent combines multiple adjustment functions (vertical positioning, lateral sliding, tilt adjustment, and storage positioning) into a single integrated mechanism. The spring-loaded arm with cam surface allows all these adjustments to be made simultaneously through one motion, rather than requiring separate mechanisms for each degree of freedom.
Solution Approach 2:
The single adjustment mechanism serves multiple functions: it provides vertical positioning, lateral adjustment, tilt control, and enables storage positioning. This multi-functional design eliminates the need for separate adjustment mechanisms for each function, reducing both complexity and adjustment time.
2Measurement precision
If multiple adjustment interfaces are provided for XYZ and tilt, then positioning accuracy is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent merges multiple adjustment interfaces into a single integrated mechanism. The spring-loaded arm with cam surface combines vertical positioning, lateral sliding, and tilt adjustment into one unified system, eliminating the complexity of multiple separate interfaces while maintaining positioning accuracy.
3Measurement precision
If conventional multi-step adjustment processes are used, then positioning accuracy is improved, but ease of operation and productivity decrease
Solution Approach 1:
The spring-loaded mechanism automatically provides the necessary adjustment force, allowing users to simply pull the arm to adjust without requiring multiple manual operations. The spring tension naturally guides the adjustment process, making it intuitive and self-service oriented.
Solution Approach 2:
The patent combines multiple adjustment steps into a single continuous motion. Users pull the spring-loaded arm in one motion to achieve vertical positioning, lateral adjustment, and tilt control simultaneously, making the process intuitive and straightforward.
4Stability of the object's composition
If permanent mounting locations are used, then device stability is improved, but adaptability to anthropometric variability decreases
Solution Approach 1:
The patent employs a dynamic spring-loaded mechanism that allows the display to be positioned at various locations along the arm's range of motion. This dynamic system adapts to different user anthropometrics while maintaining stable positioning through the spring force and cam surface engagement.
Solution Approach 2:
The single adjustable mechanism serves multiple positioning functions, allowing the display to be adapted to different user head sizes and shapes. The same mechanism provides vertical adjustment, lateral positioning, and tilt control, making the system universally adaptable while maintaining stability.
Data Source
AI summary
A quick adjustment assembly for a head or helmet mounted display. The quick adjustment assembly includes an adjustment plate assembly securely attachable to the head of a user via a helmet or head gear. An eye relief assembly is mountable on the adjustment plate assembly. The eye relief assembly includes a main frame for supporting at least one image source assembly (ISA). A pair of opposing pressure plate assemblies are supported by the main frame. Each pressure plate assembly includes an eye relief adjustment release element engageable by the user; and at least one pressure plate friction pad assembly operatively engageable with the adjustment plate assembly. The pressure plate friction pad assembly provides selectable positioning of the eye relief assembly along a plane of movement relative to the adjustment plate assembly allowing three-degrees of freedom movement along the plane of movement. The eye relief assembly preferably includes an interpupillary (IPD) adjustment assembly securely mounted thereon.