HMD Coupling Mechanism for Optical Alignment Tolerance
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Solution Overview
Problem
Existing image display devices for virtual image observation, such as head-mounted displays, are affected by manufacturing and assembly tolerances, leading to potential misalignment of optical systems for the left and right eyes.
Innovation Solution
The image display device incorporates a fixing member that allows the first and second display units to rotate in rotational directions around two or more axes, enabling precise alignment before being fixed in place, thereby minimizing the impact of tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display units are fixed directly without rotation capability, then the assembly process is simpler, but the alignment precision is degraded due to manufacturing and assembly tolerances
Solution Approach 1:
The fixing member incorporates a rotation mechanism that allows the display units to rotate around one or more axes during assembly, enabling dynamic adjustment of alignment. This rotational degree of freedom compensates for manufacturing and assembly tolerances, achieving precise alignment before fixation.
Solution Approach 2:
The rotation capability changes the positional and orientational parameters of the display units relative to the frame. By allowing rotation around one or more axes, the system can adjust angular parameters to achieve optimal alignment, then fixes this adjusted state to maintain precision.
2Adaptability or versatility
If the fixing member allows rotation around two or more axes, then the alignment freedom is improved, but the structural complexity increases
Solution Approach 1:
The fixing member is designed with rotational joints or coupling mechanisms that enable rotation around one or more axes. This dynamic capability provides multiple degrees of freedom for alignment adjustment, allowing the display units to be precisely positioned relative to each other and the frame before final fixation.
Solution Approach 2:
The fixing member may be segmented into multiple components with rotational joints, allowing independent rotation around different axes. This segmentation enables complex alignment adjustments while keeping each individual rotational mechanism relatively simple.
Data Source
AI summary
An image display device includes a first display unit including a first frame and a first optical system, a second display unit including a second frame and a second optical system, and a fixing member configured to fix the first display unit and the second display unit relative to each other, wherein the fixing member has a shape configured to rotate the first optical system and the second optical system in rotational directions around two or more axes when the first display unit and the second display unit are aligned prior to fixing.