Head-Up Display Reflection Unit Vibration Mitigation
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Solution Overview
Problem
The existing head-up display (HUD) devices experience shaking of the display image due to vibrations, primarily caused by the movement of the reflection member along the turning axis, which affects the stability of the projected image.
Innovation Solution
The HUD device incorporates a supporting mechanism with spherical surfaces and sliding surfaces shaped like cones or triangular pyramids, along with elastic members to maintain point or linear contact, allowing the reflection unit to rotate smoothly and absorb vibrations, thereby reducing image displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is provided between the supporting part and the supported part to permit movement, then the ease of operation is improved, but the stability of the object's composition deteriorates causing reflection member vibration
Solution Approach 1:
The supported part is given a spherical shape that fits into a corresponding spherical recess in the supporting part. This curved interface allows rotational movement while maintaining continuous contact and stability, eliminating the vibration problem caused by linear gaps while preserving the ease of operation.
Solution Approach 2:
The support structure is designed to be dynamically adaptable, allowing the reflection member to rotate smoothly through the spherical joint mechanism. The elastic member provides dynamic force to maintain contact between the spherical surfaces during rotation, enabling operation while preventing instability.
2Adaptability or versatility
If the reflection member is allowed to rotate about the turning axis, then the adaptability is improved, but the stability of the object's composition deteriorates causing display image shaking
Solution Approach 1:
The spherical interface between the supported part and supporting part provides a stable rotational joint. The curved surfaces maintain consistent contact during rotation, allowing the reflection member to change orientation adaptively while the elastic member ensures continuous pressure to prevent shaking and maintain display image stability.
Solution Approach 2:
The spherical joint acts as an intermediary mechanism between the rotation requirement and the stability requirement. It mediates the rotational motion while the elastic member mediates the force transmission, allowing adaptability through rotation while maintaining stability by preventing excessive movement and vibration.
3Stability of the object's composition
If an elastic member is added to press the supported part and supporting part together, then the stability of the object's composition is improved, but the device complexity increases
Solution Approach 1:
The spherical geometry of the joint simplifies the overall structure compared to complex mechanical constraints. The elastic member works in conjunction with this simple curved interface to provide stability, achieving contact stability without requiring complex multi-component support mechanisms.
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 effectively reduces the shaking of the display image caused by vibrations, ensuring a stable and clear visual representation of the virtual image.
Implementation Method 1
an elastic member configured to press the supported part and the supporting part against each other in the rotation axis direction
Implementation Method 2
a sliding surface formed at the supporting part, wherein the sliding surface is in a shape along a side surface of a cone or a triangular pyramid having a height direction along the rotation axis and which is substantially in point contact or linear contact with the spherical surface that is formed at the supported part
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
Provided is a head-up display device such that shaking of a display image due to vibration can be mitigated. This head-up display device, which reflects display light output from a display unit with a reflection unit (4) so as to produce an image to be viewed, includes a first supporting part (70) for supporting the reflection unit (4) rotatably about a rotation axis (AX) and a first supported part (60) provided at one end of the reflection unit (4) and supported by the first supporting part (70). The first supported part (60) has a spherical surface formed thereon, and the first supporting part (70) has a sliding surface that is formed therein and is in substantially point contact or line contact with the spherical surface formed on the first supported part (60). A first elastic member (S1) that presses the first supported part (60) and the first supporting part (70) against each other in the rotation axis (AX) direction is provided.