Vehicle Head-Up Display Combiner Tilt Mechanism
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Solution Overview
Problem
Conventional horizontal combiner head-up displays in vehicles suffer from slow deployment speed and distorted virtual images due to the combiner rotating about its lower end, leading to user fatigue from viewing skewed images.
Innovation Solution
A head-up display apparatus where the combiner tilts around its central axis, utilizing a holder unit, moving unit, driving unit, and tilting unit to precisely control the combiner's position and angle, ensuring the light path remains consistent and minimizing image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the combiner rotates about its lower end, then the combiner can be adjusted to optimal position, but the virtual image becomes distorted and user eyes become fatigued
Solution Approach 1:
Instead of rotating the combiner about its lower end as in conventional designs, this patent inverts the rotation approach by making the holder unit rotate about a vertical axis while the combiner itself remains substantially fixed in orientation. This inversion resolves the contradiction by maintaining both adjustability and image quality.
Solution Approach 2:
The patent segments the adjustment mechanism into two independent rotational movements: (1) the holder unit rotating about a vertical axis to adjust combiner position, and (2) the combiner remaining fixed in orientation. This segmentation allows position adjustment without introducing image distortion.
2Ease of operation
If a lead screw mechanism is used to move the combiner, then the combiner can be deployed, but the deployment speed is slow
Solution Approach 1:
The patent replaces the lead screw mechanical transmission system with a direct rotational motor-driven system. The motor directly rotates the holder unit, eliminating the intermediate lead screw mechanism and significantly increasing deployment speed while maintaining ease of operation.
3Ease of operation
If the combiner angle is adjusted using stepper motor, then the combiner can be positioned, but the adjustment depends on lead size and motor angle limiting precision
Solution Approach 1:
The patent replaces the lead screw and stepper motor combination with a direct motor rotation system that controls the holder unit's rotational position. This substitution eliminates the mechanical transmission errors inherent in lead screw systems and provides more precise angular control.
Solution Approach 2:
Instead of adjusting the combiner angle directly through mechanical transmission, the patent inverts the approach by rotating the entire holder unit to achieve position adjustment, keeping the combiner's optical angle fixed. This eliminates precision losses from mechanical transmission.
Data Source
AI summary
A head-up display apparatus for a vehicle may include: a housing defining an interior space, with an entrance formed on a side of the housing; a holder unit coupled at a side thereof to a combiner; a moving unit located in the interior space of the housing, rotatably coupled to the holder unit, and reciprocating in one direction to cause the combiner to be accommodated in the interior space of the housing or to be exposed to an outside through the entrance of the housing; a driving unit coupled to the moving unit to move the moving unit; and a tilting unit slidably coupled to the moving unit and coupled to the driving unit, the tilting unit being moved by the driving unit to cause the combiner to be tilted around an imaginary central axis transverse to the combiner.