Head-Up Display Mirror With Variable-Height Raised Wall
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Solution Overview
Problem
Conventional head-up displays in vehicles face issues with increased weight and manufacturing costs due to larger ribs on the mirrors, which affect the weight and cost of the display.
Innovation Solution
The head-up display design includes a mirror with an elongated base and raised walls where the center portion is higher than the end portions, with cut-off ends to reduce weight and cost, while maintaining rigidity and allowing for closer placement to the housing, enabling smaller housing size and improved resin filling during molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If larger ribs are provided on the mirror base, then the rigidity and strength of the mirror are improved, but the weight and manufacturing cost of the head-up display increase
Solution Approach 1:
The raised wall structure provides localized reinforcement at the center portion of the mirror base where structural support is most needed, while the end portions remain lighter. This creates a non-uniform distribution of material that optimizes the strength-to-weight ratio by placing material only where structurally necessary.
Solution Approach 2:
The raised wall has different heights at its center portion versus its end portions, creating an asymmetric structure. The center portion extends higher to provide maximum rigidity where the mirror requires support, while the lower end portions reduce unnecessary weight, resolving the contradiction between strength and weight.
2Strength
If larger ribs are provided on the mirror base, then the structural strength is improved, but the manufacturing cost increases
Solution Approach 1:
The raised wall structure provides localized reinforcement only where structurally necessary (center portion), rather than uniformly throughout the entire base. This reduces the total amount of material required compared to a fully reinforced base, thereby lowering manufacturing cost while maintaining necessary strength.
Solution Approach 2:
The asymmetric height configuration of the raised wall optimizes material usage by providing maximum structural support at the center while reducing material at the ends. This asymmetric design achieves the required strength with less material, reducing manufacturing cost.
3Volume of stationary object
If the mirror is placed closer to the housing, then the housing size can be reduced, but the rigidity requirements of the mirror become more challenging to meet
Solution Approach 1:
The raised wall structure provides concentrated structural reinforcement at the center portion of the mirror base, enabling the mirror to maintain high rigidity even when placed closer to the housing where space is constrained. This localized support allows compact housing design without sacrificing mirror stability.
Solution Approach 2:
The asymmetric raised wall configuration optimizes structural efficiency for compact mounting, providing maximum rigidity where needed while allowing the mirror to be positioned closer to the housing, thereby enabling reduced housing volume without compromising strength.
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
This configuration reduces the weight and manufacturing costs of the head-up display, inhibits vibration-induced image distortion, and allows for a more compact design without compromising image quality or shape freedom.
Implementation Method 1
the first surface including a reflective surface that guides the display light to the display medium
Data Source
AI summary
A head-up display includes: an image generator that emits display light that forms a display image; a second reflective mirror that forms a virtual image on a side opposite to an observer relative to the windshield by guiding, to the windshield, the display light emitted from the image generator; and a housing that houses the image generator and the second reflective mirror. The second reflective mirror includes: an elongated base that includes a first surface including a reflective surface that guides the display light to the windshield and a second surface that is a rear surface of the first surface; and a raised wall extending upward from a terminal edge of the second surface and extending in a longitudinal direction of the base. The center portion of the raised wall in the longitudinal direction is greater in height than each end portion of the raised wall in the longitudinal direction.