HUD Casing Segmentation for Image Stability and Impact Absorption
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Solution Overview
Problem
Existing head-up display devices experience image jitter during vehicle travel due to vibrations, and struggle to effectively absorb impact energy when an external load is applied, as fragile portions in the fixing members or lower cases are prone to breaking, affecting the stability and safety of the system.
Innovation Solution
The design incorporates a more rigid lower case with a light source unit and a fragile upper case with a thin portion that breaks under impact, allowing the upper case to move downward and absorb impact energy, while the lower case maintains rigidity to suppress image jitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the lower case is made rigid to suppress image jitter during traveling, then the stability of image information is improved, but the ability to absorb impact energy is reduced
Solution Approach 1:
The casing is divided into two distinct parts: the lower case with high rigidity for stability and the upper case with low rigidity for impact absorption. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
Different rigidity characteristics are assigned to different parts of the casing. The lower case has high rigidity to stabilize the light source unit and suppress image jitter, while the upper case has low rigidity to absorb impact energy through deformation.
2Loss of energy
If the upper case is made fragile to absorb impact energy, then the impact energy absorption is improved, but the overall structural strength is reduced
Solution Approach 1:
The upper case is designed with low rigidity specifically in the impact reception area to enable energy absorption through deformation, while maintaining sufficient overall strength to protect internal components during normal operation.
Data Source
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AI summary
A head-up display device (12) includes a casing (66) provided inside an instrument panel (16). The casing (66) includes an upper case (68) constituting an upper part of the casing (66) and provided with a fragile portion (68A) that is configured to be broken when an impact load is input to the casing (66) from an upper side in a vehicle up-down direction, and a lower case (70) constituting a lower part of the casing (66), provided with a light source unit (62) configured to emit image information, and having a rigidity higher than that of the upper case (68).