变焦型双光路车载抬头显示光学系统设计  

Design of Variable Focal Plane Dual-Light-Path Vehicle Head-Up Display System

作　　者：田曼力 薛常喜[1,2] Tian Manli;Xue Changxi(School of Opto-Electronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;Key Laboratory of Advanced Optical System Design and Manufacturing Technology of Jilin Province,Changchun University of Science and Technology,Changchun 130022,Jilin,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]长春理工大学先进光学设计与制造技术吉林省高校重点实验室,吉林长春130022

出　　处：《光学学报》2024年第14期191-201,共11页Acta Optica Sinica

基　　金：国家自然科学基金(61905024)。

摘　　要：提出了一种变焦型双光路增强现实抬头显示光学系统,并利用矢量像差理论进行初始结构设计。该系统用两块图像生成单元搭建近光路和远光路,分别用于显示基础信息和交互信息,且远光路成像距离可在一定范围内进行连续调节,最终得到了一个眼盒大小为120 mm×60 mm、视场角分别为5°×1°和10°×5°、成像距离分别为2.5 m和10~20 m的双光路车载抬头显示系统。本研究为增强现实抬头显示系统提供了一种新的设计结构,提高了增强现实显示效果。Objective Augmented reality head-up display(AR-HUD) systems can project driving information in the form of images or text into a driver's field of view, providing real-time and intuitive driving information and enhancing driving safety. The focal point of vision changes with vehicle speed according to the characteristics of the human eye. However, traditional ARHUD systems can only project images at a fixed distance, which not only fails to achieve the ideal AR effect, but also leads to visual fatigue. Existing variable imaging distance AR-HUD systems use off-axis reflection structures to adjust the position of the first mirror or the position and size of the picture generation unit(PGU) to change the projection distance.However, they can not simultaneously satisfy the different imaging distance requirements for basic and interactive information. Therefore, it is necessary to propose a variable imaging distance AR-HUD system that can display basic and interactive information separately.Methods The initial structure of an off-axis three-mirror system is generally based on the design of a coaxial three-mirror system, but the final structure usually deviates significantly. This intermediate process also requires considerable time.This study constructed an aberration evaluation function for off-axis reflective systems based on vector aberration theory and used a global optimization algorithm to find the optimal solution for the evaluation function, directly obtaining the initial structure of the off-axis three-mirror system. Two PGUs were used to construct near-and far-field optical paths to design a dual-focal-plane AR-HUD system. Referring to the zoom principle of coaxial systems, to ensure that the positions of the PGUs remain unchanged during changes in the imaging distance, it is necessary to adjust the spacing of the two mirrors. However, in this study, the near-and far-field optical paths shared the same freeform mirror. To ensure that the changes in the imaging distance of the far-field optical path do not af

关 键 词：光学设计 抬头显示器 增强现实 变焦平面 矢量像差理论 

分 类 号：O435[机械工程—光学工程]