HUD Concave Mirror Support Using One Spring to Prevent Backlash
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Solution Overview
Problem
Existing HUD apparatuses face challenges in preventing rattling between the rotary shaft and the rotation mechanism, particularly around the rotation axis, which leads to backlash and inaccurate angular position control of the concave mirror.
Innovation Solution
A display apparatus with a single elastic member, such as a leaf spring, that urges the optical element in both the axial direction and around the axis, preventing rattling and maintaining precise angular position control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple elastic members are used to prevent rattling in different directions, then rattling prevention is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple elastic members into a single integrated elastic member that can simultaneously prevent rattling in multiple directions (axial direction and radial direction) through its结构设计. This single elastic member replaces what would traditionally require multiple separate elastic members, thereby reducing device complexity while maintaining effective rattling prevention.
Solution Approach 2:
The elastic member is designed with multi-functional capabilities to handle rattling prevention in different directions simultaneously. It can exert elastic forces both in the axial direction and radial direction, making it a universal solution that replaces multiple specialized components.
2Reliability
If independent elastic members are arranged for each direction, then rattling prevention is improved, but assembly work becomes complicated
Solution Approach 1:
By merging multiple elastic members into one integrated component, the patent reduces the number of assembly steps required. Instead of installing and adjusting multiple separate elastic members, the single elastic member can be installed as one unit, significantly simplifying the assembly process.
3Device complexity
If a single elastic member is used, then device complexity is reduced, but rattling prevention capability is worsened
Solution Approach 1:
The single elastic member is internally segmented or structured to provide multiple independent elastic forces in different directions. This segmentation within a unified structure allows it to prevent rattling in both axial and radial directions simultaneously, maintaining high reliability while keeping device complexity low.
Solution Approach 2:
The elastic member is designed with three-dimensional structural features that enable it to exert forces in multiple directions from a single component. By utilizing spatial geometry and multi-directional elastic deformation capabilities, it achieves comprehensive rattling prevention without requiring multiple separate members.
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 restricts the movement of the optical element, preventing rattling and ensuring stable display image positioning, thereby enhancing the accuracy and quality of the HUD apparatus.
Implementation Method 1
a single elastic member that urges the optical element in an axial direction and in the direction around the axis
Data Source
AI summary
A display apparatus is capable of preventing an optical element provided in the display apparatus such as a HUD apparatus from rattling, to adjust a display position of an image with high accuracy. In a HUD apparatus including a concave mirror that projects image light of an image displayed on an image display unit, the concave mirror is supported on an apparatus body via the rotary shaft and is able to pivot in a direction around an axis with a rotation mechanism. A single elastic member 6 is included that urges the concave mirror in the axial direction and the direction around the axis of the rotary shaft.