目镜式头戴静脉显示光学系统的设计

Design of Head-Mounted Eyepiece Display for Vein Imaging Optical System

为提高静脉注射的成功率,设计了一款头戴静脉显示光学系统,该系统由红外成像系统与穿透型目镜式头戴显示器组成。近红外成像系统具有F/1.59的大数值孔径,利于弱红外散射光的收集成像,设计中采用了旋转对称的二次曲面设计,系统的质量是相应球面系统的77.8%。穿透型头戴显示器结构简单紧凑,采用了旋转对称的二次曲面设计,系统的质量是相应球面系统的55.6%。设计结果显示,近红外成像系统成像质量优异,分辨率可达扩展图形阵列(XGA)(1024pixel×768pixel)。穿透型目镜式头戴显示器具有10mm的出瞳直径,50mm的出瞳距离,0.068D的最大场曲(D为屈光度),0.372%的最大相对畸变以及XGA(1024pixel×768pixel)的显示模式分辨率。双目光学系统的总质量为44g。较之现有的静脉显示系统,本系统具有结构简单紧凑、数值孔径大、分辨率高、重量轻等特点。

A head-mounted vein imaging optical system composed by the infrared imaging system and see-through head-mounted eyepiece displayer is designed to greatly improve the success rate of intravenous medication. The near infrared imaging system has large numerical aperture of F/1.59, which is beneficial to the collection of the weak infrared scattered light. We choose quadric surface design of rotational symmetry, the weight of the imaging system is 22.2% lighter than the corresponding spherical system. The structure of the see-through head-mounted eyepiece displayer is simple and compact, because of its quadric surface design of rotational symmetry, which is 44.4 lighter than the corresponding spherical system. The design results show that the imaging quality of the nearinfrared imaging system is excellent, and its resolution can reach extended graphics array （XGA） （1024 pixel × 768 pixel）. The see-through head-mounted eyepiece display gets a 10 mm exit pupil, a 50 mm eye relief, a maximum field curvature of 0.068D （D is diopter）, a maximum relative distortion of 0. 372% and display model resolution of XGA （1024 pixel× 768 pixel）. The total weight of binocular system is about 44 g. Comparing with the simple and compact structure, large numerical aperture