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针对三组式伸缩型结构高倍率变焦距镜头设计进行了研究。对含中间固定组的三组式结构高斯光学进行了讨论,给出了高倍率设计的高斯解范围和选取原则,并编制了可视化辅助设计软件,为高斯参数的最优化选取提供条件。采用这种结构设计了一套焦距12~600mm、变倍比50倍、视场角0.85°~41.2°的伸缩型变焦距镜头,短焦时前片至像面175mm、长焦时为309mm,长焦端远摄比达0.51;各焦距位置在100lp/mm处轴上视场调制传递函数(MTF)大于0.3,边缘视场MTF大于0.2,同时系统具有小型、便携的特点。
Aiming at the design of high magnification zoom lens with three groups of telescopic structure, Gaussian optics with three groups of fixed structures are discussed. The range and selection principle of Gaussian solution for high magnification design is given. Visual aided design software is also prepared to provide the conditions for optimal selection of Gaussian parameters. A telescopic zoom lens with a focal length of 12-600mm, a magnification of 50 times and a field of view of 0.85 ° -41.2 ° has been designed by adopting this structure. When the short focal length is 175mm for the front slice to the image plane and 309mm for the telephoto, Telephoto telephoto ratio of up to 0.51; each focal length at 100lp / mm axial field modulation transfer function (MTF) greater than 0.3, the edge of the field of view MTF greater than 0.2, while the system has a small, portable features.