HUD Combiner Positioning via Camwheel and Locking Element
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Solution Overview
Problem
Head-up display (HUD) systems face challenges in maintaining reliable positional accuracy and reducing vibration, which are crucial for user comfort and operational effectiveness, especially in varying environmental conditions and mobile environments, while also requiring high precision and increased manufacturing and maintenance costs.
Innovation Solution
A combiner positioning system that includes a carrier, locking element, camwheel, and guide element, allowing the combiner to move between stowed and display positions with precise control, using a locking element to rigidly hold the axle in the display position and increase resonance frequency, and a camwheel to kinematically drive the movement, thereby reducing vibration and enhancing positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high precision parts with close tolerances are used to achieve repeatable positional accuracy, then positional accuracy is improved, but manufacturing and maintenance expense increases
Solution Approach 1:
The patent changes the tolerance parameters of the positioning system components to relaxed tolerances while maintaining functional accuracy through the camwheel mechanism's geometric design. The camwheel's profile is specifically designed to provide the necessary positioning accuracy without requiring high-precision manufacturing of all components, thereby reducing manufacturing costs while achieving the required positional accuracy for combiner positioning.
Solution Approach 2:
The positioning system is segmented into distinct functional components: the camwheel for motion generation, the carrier pin for engagement, and the locking element for position fixation. This segmentation allows each component to be optimized for its specific function rather than requiring all components to meet high precision tolerances, reducing overall manufacturing complexity and cost while maintaining system accuracy.
2Ease of operation
If the combiner is allowed to move freely between positions, then ease of operation is improved, but vibration increases causing user irritation
Solution Approach 1:
The locking element is designed to engage the carrier at the display position before the combiner is fully moved into place. This preliminary action secures the combiner in its final position, preventing excessive movement and the resulting vibration that would occur if the combiner were allowed to move freely without restraint. The locking mechanism is activated in advance to ensure stable positioning.
Solution Approach 2:
The system transitions from a static locked position to a dynamic moving state and back to a static locked position. The camwheel mechanism provides controlled motion during transitions while the locking element maintains a stable, vibration-free state during operation. This dynamic design allows the combiner to move when needed while preventing vibration during the display phase through proper engagement of the locking mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces vibration and maintains precise positional accuracy, enhancing user experience and operational reliability while potentially lowering manufacturing and maintenance costs by using a camwheel-driven mechanism to move the combiner between positions.
Implementation Method 1
the locking element includes a spring configured to exert a spring force for holding the axle in the display position
Implementation Method 2
the combiner positioning system comprises at least one camwheel, wherein the combiner positioning system is configured to rotate the camwheel about a camwheel axis and engage the carrier with a carrier pin of the camwheel
Data Source
Figure 1
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Figure 2B
AI summary
A combiner positioning system for a head-up display includes a carrier and a locking element. The carrier supports a combiner for the head-up display, and the combiner is movable between a stowed position and a display position. The locking element has an engaged position and a disengaged position. The locking element engages a portion of the carrier in the display position and rigidly holds the carrier in the display position.