光学学报, 2018, 38(7): 0722003, 网络出版: 2019-05-09

基于自由曲面的离轴两反头戴显示光学系统设计

Design of Off-Axis Head-Mounted Display Optical System Based on Two Reflective Optical Free-Form Surfaces
作者单位

1南京信息工程大学物理与光电工程学院, 江苏 南京 210044

2南京理工大学电子工程与光电技术学院, 江苏 南京 210094

3同济大学物理科学与工程学院, 上海 200092

摘要
头戴显示系统在现代教育、医疗和娱乐等领域具有广泛的应用,离轴反射式头戴显示光学系统是头戴显示系统的一种设计形式,既能满足小型化和结构紧凑的需求,又能实现宽光谱成像,无需校正色差;然而,现有离轴反射式头戴显示光学系统的设计难以满足大出瞳直径和小F数相兼容的要求。针对该问题,提出基于光学自由曲面的离轴两反头戴显示光学系统,实现了大出瞳直径和小F数。该自由曲面头戴显示光学系统分别采用双曲率基面自由曲面和XY多项式自由曲面,出瞳直径为10 mm,F数为3.0,视场角为28°,出瞳距大于15 mm。该系统的成像性能满足要求且优于现有设计结果。
Abstract
The head-mounted display system is widely applied in the fields of modern education, medical treatment, and entertainment. The off-axis reflective head-mounted display optical system is a design form of head-mounted display system, and it can not only meet the requirements of miniaturization and compactness, but also realize broadband spectrum imaging without color aberration correction. However, the existing designs of off-axis reflective head-mounted display optical systems cannot compatibly meet the demands of large diameter of exit pupil and small F number together. To solve this problem, we design an off-axis head-mounted display optical system based on two reflective free-form surfaces to realize the requirements of large diameter of exit pupil and small F number. The double-curvature free-form surface and XY polynomial freeform surface are used in our designed head-mounted display optical system, its pupil diameter is 10 mm, F number is 3.0, field of view is 28°, and eye relief is larger than 15 mm. The final imaging performance of the system meets the requirements, and it is better than the current design results.
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