一种长工作距广角工业内窥镜头的设计  

Design of a long working distance wide-angle industrial endoscope lens

作　　者：葛玉德 吴海滨[1] 胡明勇[2] 封志伟[2] 李昭阳 刘凯迪 范轩硕 GE Yude;WU Haibin;HU Mingyong;FENG Zhiwei;LI Zhaoyang;LIU Kaidi;FAN Xuanshuo(School of Physics and Material Science,Anhui University,Hefei 230601,China;Academy of Photoelectric Technology,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽大学物理与材料科学学院,安徽合肥230601 [2]合肥工业大学光电技术研究院,安徽合肥230009

出　　处：《量子电子学报》2021年第6期815-822,共8页Chinese Journal of Quantum Electronics

基　　金：科技部创新基金,07C26213400516。

摘　　要：为了满足大角域范围覆盖、高信息量获取的需求,设计了一种可见光范围的长工作距广角工业内窥镜。该镜头基本结构采用多级成像,物镜系统采用反远距型结构,转像系统采用透镜式。镜头像面处接1/3英寸CCD,基于成本及像质方面综合考虑,采用球面透射式且非胶合方案。使用ZEMAX软件对该镜头进行了优化设计,并进行了像质评价。最终镜头由一个蓝宝石窗口、12片球面透镜及一个用来延长光程的厚平面组成,全视场角为102°,焦距为3.25 mm,工作距全长为730 mm。光学系统入瞳直径为1 mm,成像弥散斑半径大小在6 μm以内,接近衍射极限,在50 lp/mm处的调制传递函数值大于0.4,最大畸变值小于25%。评价分析表明设计结果满足技术要求,结构合理。In order to meet the needs of large angle coverage and high information acquisition, a long working distance wide-angle industrial endoscope with visible light range is designed. The basic structure of the lens is multistage imaging, where the objective lens system adopts the reverse telephoto structure,and the transformation image system adopts the lens type. The image surface of the lens is connected with a 1/3 inch CCD. Based on the comprehensive consideration of cost and image quality, the spherical transmissible and unglued scheme is finally adopted. The optimization design is carried out with ZEMAX software and the image quality is evaluated. Considering the cost and image quality, the spherical transmissive and unglued scheme is finally adopted. The final lens is composed of a sapphire window, 12spherical lenses and a thick plane used to extend the optical path. The full field angle of the lens is102°, a focal length is 3.25 mm and the total working length is 730 mm. The diameter of the optical system’s entrance pupil is 1 mm, the radius of the imaging dispersion spot is within 6 μm, which is close to the diffraction limit. The modulation transfer function value at 50 lp/mm is greater than 0.4, and the maximum distortion value is less than 25%. The evaluation and analysis show that the design results meet the technical requirements and the structure is reasonable.

关 键 词：几何光学 广角工业内窥镜 多级成像 短焦距 

分 类 号：O431.2[机械工程—光学工程]