Tensioned Element Mechanism for Optical Module Lateral Adjustment
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Solution Overview
Problem
Existing optical systems, such as head-mounted displays, face challenges in accommodating varying inter-pupil distances among users, as traditional adjustment mechanisms like rack-and-pinion systems are bulky and constrained in space, making it difficult to achieve ergonomic and user-friendly fine control for adjusting left and right optical modules.
Innovation Solution
The implementation of a belt-drive mechanism using a tensioned element wrapped around pulleys allows for parallel movement of optical modules, enabling lateral width adjustment without adding bulk to the device, allowing the adjustment interface to be placed ergonomically and accommodating different inter-pupil distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional rack-and-pinion adjustment mechanisms are used, then optical module lateral width can be adjusted, but the device becomes bulky and space-constrained
Solution Approach 1:
The patent replaces the traditional rack-and-pinion mechanical adjustment mechanism with a tensioned element system (such as a belt or string) that runs through guide elements. This substitution eliminates bulky gears and mechanical linkages, achieving optical module adjustment through a more space-efficient tensioned element configuration that can be routed through available spaces within the device chassis.
Solution Approach 2:
The tensioned element is configured to extend in multiple directions and can be routed through three-dimensional spaces within the device. By utilizing vertical and diagonal routing paths rather than purely horizontal adjustment mechanisms, the system achieves lateral width adjustment functionality while occupying minimal horizontal space within the chassis.
2Volume of moving object
If compact adjustment mechanism is used, then device space is optimized, but adjustment precision and control may be compromised
Solution Approach 1:
The patent introduces guide elements (such as guide pins or guide rails) that act as intermediaries between the tensioned element and the optical modules. These guide elements constrain the movement paths and ensure precise, controlled adjustment of the optical modules while the compact tensioned element system provides the actuation force, maintaining both compactness and positioning precision.
3Ease of operation
If adjustment interface is placed for ergonomic access, then user-friendliness improves, but device internal space arrangement becomes more complex
Solution Approach 1:
The tensioned element system is designed with flexible routing that can adapt to different device configurations and user access requirements. The element can be routed through various paths within the chassis and can accommodate different interface locations, allowing ergonomic placement of adjustment controls while maintaining a relatively simple internal structure through flexible rather than rigid routing.
Data Source
AI summary
An optical system comprises a first optical module and a second optical module. A tensioned element includes an upper segment attached to the first optical module and a lower segment attached to the second optical module. Movement of the tensioned element thus generates opposing movement of the first and second optical modules, the first optical module moving in a direction parallel to a direction of movement of the upper segment, and the second optical module moving in a direction parallel to a direction of movement of the lower segment.