Projection Apparatus Shading Stop for Solar Radiation
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Solution Overview
Problem
Existing head-up display devices in motor vehicles are affected by incident solar radiation, which negatively impacts the observer's perception of the virtual image.
Innovation Solution
A projection device with a housing containing a light-generating device and an image-generating unit, featuring a translucent cover and a separate, opaque screen arranged at an angle to the cover, which blocks undesirable solar radiation and prevents it from reaching the observer, thereby improving the perception of the virtual image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening is covered with a translucent cover to prevent dust and liquids from entering the housing, then the protection of the light generating device and image generating unit is improved, but solar radiation can still reach the observer through the cover, causing blinding and reducing image perception quality
Solution Approach 1:
The cover is divided into two functional parts: a translucent cover for protecting internal components from dust and liquids, and a separate opaque screen for blocking solar radiation. This segmentation allows each component to perform its specific function without compromising the other.
Solution Approach 2:
The opaque screen acts as an intermediary element positioned between the translucent cover and the observer. It specifically blocks solar radiation while allowing the translucent cover to maintain its protective function, thus mediating between the conflicting requirements of radiation blocking and component protection.
2Object-affected harmful factors
If a separate opaque screen is added to block solar radiation, then the reduction of harmful solar radiation is improved, but the device complexity increases
Solution Approach 1:
The opaque screen serves multiple functions: it blocks solar radiation, provides structural support for the cover assembly, and can be integrated with the housing structure. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The opaque screen is integrated with the cover assembly and housing structure, merging multiple functions into a unified component system. This integration approach minimizes the number of discrete parts while achieving the desired solar radiation blocking effect.
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 solution effectively reduces the impact of solar radiation on the observer, preventing blinding and maintaining the clarity of the virtual image by masking out reflected and additional radiation, enhancing the observer's experience.
Implementation Method 1
the opening is covered with a translucent cover. This prevents dust or liquids or other elements from entering the further interior of the housing
Implementation Method 2
This screen, which is also a shading element, is arranged at an angle to the cover and, moreover, is positioned at least adjacent to this cover. Undesirable reflected radiation and also undesired additional radiation that does not come from the interior of the housing of the image generation unit can thereby be shaded or masked out
Implementation Method 3
the panel is arranged in relation to the cover in such a way that solar radiation reflected on the cover in a direction away from the exterior mirror impinges on the panel
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a projection apparatus (1) for projecting a virtual image in a motor vehicle (I), said projection apparatus having a housing (12), in which a light production apparatus (8) and an image production unit (10) for producing the virtual image from the light emitted by the light production apparatus (8) are arranged, wherein the housing (12) has an aperture (14) through which the virtual image can be radiated out of the housing (12) to an external mirror (6), arranged at the housing (12), of the projection apparatus (1), wherein the aperture (14) is covered by a light-transmissive cover (13) and a light-opaque stop (15) is arranged at an angle (α) to the cover (13) and at least adjacent to the cover (13). The invention also relates to a motor vehicle (I) having a projection apparatus (1).