高清针孔镜头光学系统设计

安防监控镜头在保护人身及财产安全方面越来越重要，其中针孔镜头因其特殊的结构而被广泛运用。利用ZEMAX软件设计了一款用于公安取证，侦察，反恐及高温炉、工业检测等特殊场合的针孔镜头。针对光阑前置这种失对称的光学系统，通过控制其像散、场曲、畸变等几何像差进行优化设计。设计的镜头F数为2，焦距为6 mm，匹配1/4英寸CCD，工作光谱为可见光波段，空间频率100 lp/mm处全视场MTF≥0.48，畸变≤±3%。该设计结构简单，全部采用标准球面设计，光学总长小于22 mm。

Design of high-definition pinhole lens optical system

Security and protection surveillance lens is becoming more and more important in protecting personal and property safety, among which the pinhole lens is widely used because of its special structure. A pinhole lens was designed by using ZEMAX software for special occasions such as police forensics, reconnaissance, anti-terrorism as well as high temperature furnace and industrial inspection, etc. Aiming at the asymmetric optical system with the diaphragm in front of, the geometrical aberrations such as astigmatism, field curvature and distortion were controlled to optimize the design. The F number of the designed lens is 2 and the focal length is 6 mm. The lens matches 1/4 inch CCD, and the working spectrum is the visible light band, with the full field MTF≥0.48 at space frequency 100 lp/mm and the distortion ≤±3%. The designed structure is simple, which adopts the standard spherical design. The optical total length is less than 22 mm, which means better processing technology and low production cost. The tolerance analysis of the lens was analyzed, and the results show that the optical system has reasonable tolerances, good overall performance, and is feasible for mass production.