一种用于机器视觉系统的双远心镜头设计

Design of Double Telecentric Lens Using Machine Vision System

为了满足目前机器视觉工业在线检测提出的更高要求,本文给出了一种用于机器视觉系统的双远心镜头设计思路。首先,根据系统设计指标,确定较合适初始结构;然后,在双远心镜头成像原理和像差分析方法基础上,应用光学设计软件Zemax对系统像差反复优化设计,最终得到了一款具有高分辨率、低畸变及远心度小等特点的双远心镜头。该镜头系统由10片折射透镜组成,工作波长为400~700 nm,工作物距为100 mm,畸变小于0.07%,远心度最大不超过为0.06°,调制传递函数值在奈奎斯特频率77 lp/mm处均大于0.5,像差校正较好,满足系统设计要求。

This study presents a design idea for a double telecentric lens for machine vision systems to meet the industry requirements for the on-line inspection of machine vision. First, according to the design index of the system, a suitable initial structure is determined, and based on the imaging principle and aberration analysis method of the double telecentric lens, the aberration of the lens is then optimized repeatedly using the optical design software Zemax. Finally, a double telecentric lens with high resolution, low distortion, and small telecentricity is obtained. The lens system consists of 10 refraction lenses with an operating wavelength range 400–700 nm, a working object distance of 100 mm, distortion of less than 0.07%, maximum telecentricity of 0.06°, and modulation transfer function value greater than 0.5 at a Nyquist frequency of 77 lp/mm. The aberration correction is good and meets the design requirements of the system.