闭路电视监控镜头光学设计及优化技术  

Optical Designing and Optimizing Technique on CCTV Monitor Lens

作　　者：李丽娟[1] 高瑀含[1] 林雪竹[1] 宋芳[1] 

机构地区：[1]长春理工大学光电工程学院,吉林长春130022

出　　处：《激光与光电子学进展》2011年第4期84-87,共4页Laser & Optoelectronics Progress

摘　　要：利用Zemax光学工程软件,设计了一种应用于闭路电视监控镜头的光学系统。该系统有效焦距f为5 mm,F数为2.8,视场2ω为70°,采用1/2 inch CCD作为图像接收器件,像元尺寸为6.5μm×6.5μm。为实现系统结构紧凑和大视场的特点,采用反远型结构进行放缩和简化。根据闭路电视镜头的特点,在允许存在一定的场曲的条件下,使系统具有较高的分辨率。设计结果表明,利用5片球面透镜即可满足设计要求。该镜头在奈奎斯特频率处,0.7视场(FOV)以内的调制传递函数(MTF)值大于0.3,在奈奎斯特频率1/2处视场的MTF值均大于0.5。系统各组元均为球面镜,形式简单、结构紧凑。A closedcircuit television（CCTV） monitor optical system is designed by using Zemax.The effective focal length of the system is 5 mm,the Fnumber and the full field of view angle are 2.8 and 70°,respectively.The image sensor of the lens is 1/2 inch CCD,whose pixel size is 6.5 μm×6.5 μm.To achieve the lens with compact feature in structure and wide field of view,an inversed telephoto system is used.According to the character of CCTV lens,some field currature remains,which can ensure the system has a high resolution.The result shows that 5 spheric lens can meet the requirement.The value of modulation transfer function（MTF） is more than 0.3 within 0.7 field of view（FOV） at the Nyquist frequency,the MTF value of FOV is more than 0.5 at the 1/2 Nyquist frequency.Various components are the spherical mirror,the form are simple,and the structure is compact.

关 键 词：光学设计 闭路电视镜头 优化 大视场 

分 类 号：O439[机械工程—光学工程]