Head-Up Display Mirror Mounting for Stable Rotation Axis
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Solution Overview
Problem
Existing vehicle head-up display apparatuses face issues with the axis of rotation of the aspherical mirror shifting due to vibrations or external impacts, leading to clearance and increased manufacturing costs due to the use of multiple parts for fixation.
Innovation Solution
A vehicle head-up display apparatus with spherical mounts at both ends of the aspherical mirror, seated on reception blocks within a lower case, and a mount fixing unit that limits displacement with a predetermined fixing force, reducing the risk of clearance and minimizing the number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple parts are used to fix the aspherical mirror, then the reliability of fixing is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple fixing functions into a single integrated fixing structure that simultaneously provides positioning and securing functions. The reception block is designed with multiple functional features (positioning surfaces, fixing surfaces, and limiting surfaces) that replace what would traditionally require multiple separate components, thereby reducing part count while maintaining fixing reliability.
Solution Approach 2:
The fixing structure is designed to perform multiple functions: positioning the aspherical mirror, securing it against displacement, and limiting rotation. This multi-functional design eliminates the need for separate components for each function, reducing overall device complexity while ensuring reliable fixation.
2Device complexity
If a simple fixing structure is used, then the device complexity is reduced, but the reliability of preventing clearance under external force deteriorates
Solution Approach 1:
The reception block is designed with different local geometries optimized for specific functions: a first reception surface for positioning, a second reception surface for fixing, and a limiting surface for rotation control. Each local region of the fixing structure has specialized geometry that addresses specific reliability requirements without increasing overall complexity.
Solution Approach 2:
The patent employs spherical mounts and corresponding curved reception surfaces that provide stable contact and natural alignment. The spherical geometry inherently resists displacement and maintains reliable contact under external forces while keeping the fixing structure simple and elegant.
3Ease of operation
If the aspherical mirror is allowed to rotate freely, then the ease of operation is improved, but the stability of the axis of rotation deteriorates
Solution Approach 1:
The fixing structure is designed to allow controlled rotation while maintaining stability. The spherical mount enables smooth rotational movement for operation, while the reception block's geometry provides stable positioning and limits excessive displacement, achieving a balance between dynamics and stability.
Solution Approach 2:
The limiting surface of the reception block is positioned to prevent excessive rotation or displacement before it can occur. This preemptive geometric constraint ensures the axis of rotation remains stable while still allowing necessary operational movement within defined limits.
Data Source
AI summary
According to at least one aspect, the present disclosure provides a vehicle head-up display apparatus comprising: a lower case; an aspherical mirror including spherical mounts formed at both ends of the aspherical mirror; a plurality of reception blocks included in the lower case to seat the spherical mounts so that the aspherical mirror is rotatable, and formed to have a shape corresponding to each spherical mount so that a clearance with the spherical mount does not occur; at least one mount fixing unit surrounding at least a portion of the spherical mount in a state where the spherical mount is seated on each of the plurality of reception blocks to limit a displacement of the spherical mount by a predetermined fixing force; and a screen including a coupling hole for coupling with the mount fixing unit and coupled to the lower case.