Multi-DOF Moving Stage for Rapid Pupil-Aligned HUD Light Positioning
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Solution Overview
Problem
Existing vehicle head-up display systems face challenges in accurately and quickly adjusting the position of light sources to match the changing positions of a driver's pupils, particularly when implementing holographic technologies, and require miniaturization for compact vehicle integration.
Innovation Solution
A multi-degree of freedom (DOF) moving stage with a delta robot configuration, featuring driven and driving links connected in a parallelogram shape, and actuators, allowing precise and high-speed adjustment of light sources to align with pupil positions, while being compact and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional moving stage is used to adjust light source position, then the structure is simple, but the adjustment precision and speed are insufficient to track changing pupil positions
Solution Approach 1:
The moving stage is segmented into multiple independent driven links (first driven link, second driven link, third driven link) that can move independently along different axes. Each driven link is controlled by a separate actuator, allowing precise positional adjustment of the light source by coordinating the movement of multiple segments. This segmentation enables high-positioning precision while maintaining a relatively manageable structural complexity through modular design.
2Speed
If the moving stage is designed for high-speed adjustment, then the response time improves, but the device size increases
Solution Approach 1:
The patent employs a spatial arrangement where three driven links are positioned at angular intervals (90 degrees between first and second, 120 degrees between second and third) in three-dimensional space. This three-dimensional configuration allows the moving stage to achieve high-speed adjustment capabilities by utilizing spatial degrees of freedom, while the compact angular arrangement minimizes the overall volume occupied by the mechanism compared to a linear expansion approach.
3Volume of moving object
If the moving stage is miniaturized for compact vehicle integration, then the space requirement decreases, but the adjustment range and precision may be compromised
Solution Approach 1:
The driven links are constructed as composite structures comprising a rigid backbone (providing structural integrity and precision) reinforced with flexible members (providing adaptability and compactness). This composite design allows the moving stage to maintain high positioning precision within a miniaturized form factor, as the rigid components ensure accurate light source placement while the flexible elements enable compact folding or articulation to reduce overall volume for vehicle integration.
Data Source
AI summary
A multi-degree of freedom (DOF) moving stage includes: an end-effector; three driven links pivotably connected to the end-effector at angular intervals from each other; three driving links pivotably connected to the three driven links, respectively; and three actuators configured to drive the three driving links, respectively. Each of the three driven links includes first to fourth arms arranged at intervals; and a flexible member that connects the first to fourth arms to each other in a parallelogram shape across the intervals and forms pivotable joints at the intervals.