Head-Up Display Mirror Layout for Compact Optical Path Expansion
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Solution Overview
Problem
Existing head-up display devices face challenges in reducing their size due to the expansion of display light through folded mirror members, leading to increased sizes of mirror units and the overall device.
Innovation Solution
A head-up display device configuration that includes a first concave mirror reflecting display light towards a second mirror, with a mirror driving unit rotating the first mirror around a rotation axis, allowing for a smaller size by optimizing the mirror dimensions and arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If display light is expanded through folded mirror members, then the light path is extended, but the size of the mirror unit and head-up display device are increased
Solution Approach 1:
The patent employs a curved mirror with a specific radius of curvature to reflect and expand display light. The curved surface enables effective light expansion within a compact space, extending the optical path without proportionally increasing the device volume. This resolves the contradiction by using geometric curvature to achieve light path extension while maintaining compact dimensions.
Solution Approach 2:
The patent arranges optical components in a three-dimensional configuration rather than a linear sequence. By utilizing vertical and lateral spacing, the light path is folded through multiple reflections, extending the effective optical path length without increasing the horizontal footprint. This dimensional arrangement allows light expansion while keeping the device compact.
2Illumination intensity
If the mirror unit size is increased to expand display light, then light expansion is improved, but the overall device size is increased
Solution Approach 1:
The curved mirror concentrates and redirects light rays through its focused geometry, achieving effective light expansion and illumination enhancement without requiring a large mirror surface area. The curvature enables efficient light manipulation in a compact form factor, resolving the contradiction between illumination intensity and mirror area.
Solution Approach 2:
The patent optimizes specific parameters including the mirror's radius of curvature, surface area, and positioning distance from the display unit. By carefully selecting these parameters, the system achieves sufficient light expansion and illumination intensity while maintaining a compact mirror unit size. The parameter optimization balances optical performance with physical dimensions.
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 reduces the size of the head-up display device by minimizing the size of the first mirror and its driving unit, while maintaining effective light reflection and display quality.
Implementation Method 1
a first mirror that reflects the display light from the display unit
Implementation Method 2
a second mirror that reflects the display light reflected at the first mirror
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 comprises: a display unit that emits display light; a first mirror that reflects the display light from the display unit; a second mirror that reflects the display light reflected by the first mirror; and a mirror driving unit that rotates the first mirror about a rotation axis.