Geared HUD Reflecting Mirror Rotation for Larger Display Area
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Solution Overview
Problem
The challenge is to increase the size of the reflecting mirror in a head-up display apparatus while maintaining the same size of the housing, which is difficult due to space constraints and potential optical performance issues from sink formation during resin molding.
Innovation Solution
The solution involves a rotating apparatus with a second gear that meshes with a first gear located under the reflecting mirror, allowing the mirror to be rotated and increasing its size without expanding the housing, and an offset surface is provided to prevent sink formation and maintain optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the size of the reflecting mirror is increased to improve display size, then the display area is improved, but the housing size increases which is not acceptable due to vehicle space constraints
Solution Approach 1:
The reflecting mirror is positioned at an inclined angle relative to the optical axis, utilizing three-dimensional spatial arrangement. This allows the mirror to reflect light from a compact display apparatus to a larger effective display area on the windshield without increasing the housing footprint, effectively transforming a two-dimensional area constraint into a three-dimensional optical path solution
Solution Approach 2:
The reflecting mirror is made rotatable around the optical axis by a rotating apparatus. This dynamic capability allows the mirror to adjust the display position and angle, enabling a smaller mirror to achieve variable display areas and positions, effectively compensating for the reduced mirror size through motion and adjustment
2Area of moving object
If the reflecting mirror is made larger to improve display size, then the display area is improved, but the housing size must increase which conflicts with vehicle component space limitations
Solution Approach 1:
The rotating apparatus for the reflecting mirror is disposed inside the housing, nested within the existing structure. This internal placement of the rotation mechanism allows the mirror to be rotated for display adjustment without increasing the external housing dimensions, enabling a smaller mirror to achieve variable display areas through rotation
3Ease of manufacture
If resin molding is used to manufacture the reflecting mirror, then manufacturing ease is improved, but sink formation occurs which degrades optical performance
Solution Approach 1:
The thickness of the resin material in the reflecting mirror is optimized to balance manufacturing ease and optical performance. By controlling the thickness parameter, the mirror maintains sufficient structural integrity and optical quality while remaining thin enough to prevent sink formation during resin molding, achieving both ease of manufacture and manufacturing precision
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 approach effectively increases the size of the reflecting mirror while keeping the head-up display apparatus compact, minimizing the impact of sink formation on optical performance and reducing the required torque for the stepping motor, thus enhancing the display's adjustability and efficiency.
Implementation Method 1
a first gear disposed in a lower edge portion of the reflecting mirror; a rotating apparatus including a second gear that meshes with the first gear from below
Data Source
AI summary
A head-up display apparatus includes: a second reflecting mirror, a first gear, and a rotating apparatus. The second reflecting mirror is rotatable around a first rotation axis C1 extending in a transversal direction. The first gear is disposed in a lower edge portion of the second reflecting mirror. The rotating apparatus includes a second gear that meshes with the first gear from below and that is rotatable around a second rotation axis C2 aligned with the first rotation axis C1. When the rotating apparatus rotates the second gear, the second reflecting mirror is rotated.