Wearable Display Camera Alignment via Integrated Light-Guiding Member
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Solution Overview
Problem
Wearable display devices face challenges in maintaining accurate alignment between the display image range and imaging range due to manufacturing and assembly tolerances, leading to reduced accuracy in see-through type applications where virtual images are superimposed on external space images.
Innovation Solution
An optical device with a light-guiding member, a positioning portion, a space detection sensor, and a sensor fixing member that securely attaches the sensor to the light-guiding member, ensuring high positional accuracy and preventing shifting between the camera's imaging range and the display's image range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the camera is fixed to a separate housing that is assembled to the light-guiding member, then the device structure is modular and easier to manufacture, but manufacturing tolerances and assembly tolerances cause shifting between display image range and imaging range
Solution Approach 1:
The patent integrates the camera fixing portion directly into the light-guiding member as a unified structure, eliminating the separate housing assembly. The camera is positioned and fixed within a dedicated cavity formed in the light-guiding member itself, ensuring precise alignment between the imaging range and display image range without the accumulation of assembly tolerances.
Solution Approach 2:
The light-guiding member is designed with a pre-formed camera fixing portion including a cavity and positioning features during the initial manufacturing process. This preliminary integration of the fixing structure ensures that the camera's position is predetermined and accurately aligned with the light-guiding member's optical path, preventing subsequent alignment issues.
2Measurement precision
If the camera position is adjusted using an adjustment mechanism, then the alignment accuracy can be improved, but the device complexity increases
Solution Approach 1:
The light-guiding member incorporates self-positioning features such as positioning protrusions and corresponding recesses that automatically align the camera with the correct position during assembly. This self-aligning mechanism eliminates the need for complex adjustment mechanisms while ensuring high alignment accuracy between the camera's imaging range and the display image range.
3Ease of operation
If the housing is made as a separate member from the light-guiding member, then assembly and disassembly are easier, but the structural integrity and positioning accuracy are compromised
Solution Approach 1:
The camera fixing portion is merged into the light-guiding member as an integrated structure, ensuring that the camera maintains a stable and accurate position relative to the optical path. This integration eliminates the positioning instability that would result from using a separate housing, while the modular cavity design still allows for relatively easy assembly and disassembly of the camera component.
Data Source
AI summary
A transparent light-guiding unit for guiding imaging light, a positioning portion provided at the transparent light-guiding unit, a camera for performing space detection of an external space, and a camera holder that contacts the positioning portion and is attached to the transparent light-guiding unit, and holds the camera are provided. In this case, the camera holder contacts the positioning portion, thus, when the camera is attached to the transparent light-guiding unit, high positional accuracy is reliably maintained.