Rotating HUD Mirror Layout for Smaller Reflective Surface
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Solution Overview
Problem
The existing head-up display devices are larger due to the need for a concave mirror with a reflective surface that covers the entire light reflection area as it rotates, making the device bulky.
Innovation Solution
A head-up display device with a mirror that rotates between multiple positions to align display light reflection areas, ensuring they coincide, allowing for a smaller reflective surface and thus a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reflective surface is set to include the entire light reflection area that moves as the concave mirror rotates, then the mirror can cover all reflection areas during rotation, but the concave mirror and head-up display device become larger
Solution Approach 1:
The reflective surface is divided into multiple discrete reflection areas corresponding to different rotation positions, rather than using a single large continuous surface. Each reflection area is activated only when needed at specific rotation positions, allowing the overall mirror size to be reduced while maintaining complete coverage of all required light paths.
Solution Approach 2:
The system dynamically switches between different reflection areas on the mirror surface as the mirror rotates to different positions. Instead of requiring all reflection areas to be present simultaneously on a large static surface, the system uses rotational dynamics to bring different smaller reflection areas into position sequentially, reducing the required mirror area.
2Area of stationary object
If the display light reflection areas coincide at each rotation position, then the device can be made smaller, but precise alignment and positioning are required
Solution Approach 1:
The patent replaces complex mechanical positioning mechanisms with optical design and computational methods to achieve precise alignment of reflection areas. By using optical path calculation and coordinate transformation, the system determines the exact positions and orientations of reflection areas without requiring complex mechanical adjustment mechanisms, thereby reducing manufacturing precision requirements while maintaining compact size.
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 allows for a downsized head-up display device by minimizing the size of the reflective surface and the overall device while maintaining effective virtual image projection.
Implementation Method 1
a mirror including a reflective surface that reflects the display light toward the projected member
Data Source
AI summary
The purpose of the present invention is to provide a head-up display device that enables a reduction in size. A head-up display device according to the present invention displays a virtual image by projecting display light onto a windshield. The head-up display device comprises: A display unit that radiates the display light; a second mirror having a reflective surface that reflects the display light toward the windshield; and a drive mechanism that rotates the second mirror among a plurality of rotation positions centered on an axis of rotation (Ax) such that the irradiation position of the display light on the windshield changes in the height direction. When the second mirror is at each rotation position, display light reflection regions for reflecting the display light on the reflective surface are set to be substantially the same.