Adjustable Coupling for Virtual Image Display Alignment
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Solution Overview
Problem
Existing virtual image display apparatuses face accuracy issues in positioning adjustments between the display element and the projection optical system due to manufacturing errors and assembly tolerances, affecting the alignment of right-eye and left-eye images.
Innovation Solution
A virtual image display apparatus with a coupling portion that includes an adjustment structure to precisely adjust the position of the display modules in multiple directions, including rotation, longitudinal, lateral, and depth, using protruding and recessed portions with clearances to align the projection optics supporting members accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a supporting member (lens barrel) is used to support optical members, then mechanical support is provided, but manufacturing errors and assembly tolerances affect positioning accuracy between right-eye and left-eye images
Solution Approach 1:
The device is divided into separate first and second display modules that can be independently adjusted. Each module contains its own display element and projection optical system, allowing independent positioning adjustments to compensate for manufacturing errors and assembly tolerances in the frame structure.
Solution Approach 2:
The invention introduces adjustable mechanisms that allow dynamic repositioning of display elements and projection optical systems. The adjustment structures enable fine-tuning of positions in longitudinal, lateral, and depth directions, as well as rotational adjustments, to achieve precise alignment despite initial manufacturing variations.
2Device complexity
If right-eye and left-eye light-guiding optical systems are attached to a frame, then the device structure is formed, but positioning accuracy between images is affected by frame assembly tolerances
Solution Approach 1:
The invention replaces fixed attachment to the frame with dynamic adjustment mechanisms. Each display module can be independently adjusted in position and orientation, allowing the system to compensate for frame assembly tolerances and achieve precise image alignment after assembly.
Solution Approach 2:
The adjustment structures are designed to enable preliminary positioning adjustments before final fixation. This allows operators to achieve precise alignment of right-eye and left-eye images by adjusting display elements and optical systems to predetermined accurate positions.
3Ease of manufacture
If fixed positioning is used between display element and projection optical system, then assembly is simplified, but positioning accuracy deteriorates due to manufacturing errors
Solution Approach 1:
The positioning system is segmented into adjustable components rather than a single fixed connection. The display element and projection optical system are connected through adjustment mechanisms that allow independent positioning, maintaining assembly simplicity while enabling precise alignment through subsequent adjustment.
Solution Approach 2:
The invention introduces dynamic adjustment capabilities to the positioning system. Adjustable mechanisms allow display elements and optical systems to be repositioned after assembly, converting a static fixed-positioning system into a dynamic one that can achieve precise alignment despite manufacturing variations.
Data Source
AI summary
A virtual image display apparatus according to the present disclosure includes a first display module, a second display module, and a coupling portion having an adjustable structure. The adjustable structure adjusts the first display module with respect to the second display module at least a relative rotational position and relative positions in longitudinal and depth directions.