Lens Holder Structure for Precise AR Optical Module Assembly
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Solution Overview
Problem
Existing optical modules for augmented reality and virtual reality face challenges in precise assembly, leading to high defect rates due to misalignment issues such as dipvergence and convergence defects, and are prone to foreign material ingress.
Innovation Solution
A lens holder design with frames that securely couple to the lens and a display unit holder fixing part, incorporating features like recesses, grooves, and blocking plates to facilitate precise alignment and block foreign materials, thereby enhancing manufacturing convenience and reducing tolerance during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the display unit is simply attached to the lenses using adhesive, then the assembly process is easy, but the manufacturing precision deteriorates and defect rate increases
Solution Approach 1:
The patent introduces a lens holder as an intermediary component between the display unit and the lens. This lens holder includes a display unit holder fixing part that precisely positions the display unit and a frame that secures the lens. By using this intermediate structure, the system achieves both easy assembly (through modular integration) and high positioning precision (through dedicated fixing mechanisms), resolving the contradiction between manufacturing ease and precision.
2Ease of manufacture
If cumulative tolerance occurs in binocular optical modules, then assembly is simplified, but optical performance deteriorates due to dipvergence and convergence defects
Solution Approach 1:
The patent implements preliminary positioning actions through the lens holder design. The display unit holder fixing part is pre-configured with precise positioning features that establish correct alignment before final assembly. The frame includes pre-formed recesses and protrusions that guide the lens into the correct position. These preliminary structural preparations ensure that even with normal manufacturing tolerances, the optical elements maintain proper alignment, preventing dipvergence and convergence defects while keeping assembly simple.
3Device complexity
If the lens holder structure is simplified, then manufacturing cost decreases, but foreign material blocking capability deteriorates
Solution Approach 1:
The patent applies local quality by adding foreign material blocking features specifically at critical locations where contamination would occur. The frame includes recesses and protrusions that create sealed interfaces between components. The display unit holder fixing part has features that prevent foreign material entry at the display unit interface. These localized blocking features are integrated into the existing structure without significantly increasing overall complexity, maintaining cost-effectiveness while providing adequate protection against foreign materials.
Data Source
AI summary
Disclosed herein are a lens holder, an optical module including the lens holder, and a glasses-type augmented reality provision device. According to an embodiment of the present invention, there is provided a lens holder including: frames configured to be coupled to a lens and fix the lens; and a display unit holder fixing part configured to be connected to the frames and accommodate a display unit holder.