30mm～300mm轻型变焦物镜光学系统设计
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摘要
设计了一组长焦距轻量型变焦光学系统,焦距为30mm～300mm,视场角为1.1°～11.4°,F数为3.5。由于变焦系统焦距较长,并且需要在控制口径的前提下减轻质量,经过对变焦理论进行分析并结合实际情况,采用正组补偿,运用Zemax软件,对变焦系统同时进行像质优化与轻量化设计,优化过程中加入非球面,达到简化结构,提高像质的作用;在不影响像面照度的情况下,对轴外光线进行了适当的拦光,使得有效口径尽量变小,同时对系统的部分透镜材料进行替换,平衡了高像质与轻质量间的矛盾,最终使系统的总体质量从937g减小到584g,且系统像质良好,轴上调制传递函数在120lp/mm处大于0.3,轴外调制传递函数在120lp/mm处大于0.2,各视场的调制传递函数在40lp/mm处大于0.5,畸变小于1%。根据变焦运动方程,运用Matlab软件进行编程计算,得到反映变倍组与补偿组运动过程的凸轮曲线,在变焦的过程中像面比较稳定,调焦顺畅。
A long focal length lightweight zoom optic system was designed with a focal length of30 mm ～300 mm,an angle of view of 1.1°～11.4°and an Fnumber of 3.5.Due to the long focal length of the zoom system and the need to reduce the quality under the premise of control caliber,after the analysis of the zoom theory and the actual situation,the positive compensation was adopted,and the Zemax software was used to simultaneously optimize the image quality and design the lightweight zoom system.In the optimization process,the aspherical surface was added to simplify the structure and improve the image quality.Without affecting the illuminance of the image surface,the off-axis light was properly blocked,so that the effective aperture could be as small as possible,and at the same time part of the lens material was replaced,balancing the contradiction between high image quality and light weight,and finally the overall mass of the system reduced from 937 g to 584 g.Results show that the system quality is good,the onaxis modulation transfer function(MTF)is above 0.3 at 120 lp/mm,the off-axis MTF is greater than 0.2 at 120 lp/mm,the MTF for each field of view is greater than 0.5 at 40 lp/mm,and the distortion is less than 1%.According to the zoom motion equation,the programming calculation was done by Matlab software,and the cam curve reflecting the motion process of the zoom group and the compensation group was obtained.In the process of zooming,the image surface is relatively stable and the focusing is smooth.
A long focal length lightweight zoom optic system was designed with a focal length of30 mm ～300 mm,an angle of view of 1.1°～11.4°and an Fnumber of 3.5.Due to the long focal length of the zoom system and the need to reduce the quality under the premise of control caliber,after the analysis of the zoom theory and the actual situation,the positive compensation was adopted,and the Zemax software was used to simultaneously optimize the image quality and design the lightweight zoom system.In the optimization process,the aspherical surface was added to simplify the structure and improve the image quality.Without affecting the illuminance of the image surface,the off-axis light was properly blocked,so that the effective aperture could be as small as possible,and at the same time part of the lens material was replaced,balancing the contradiction between high image quality and light weight,and finally the overall mass of the system reduced from 937 g to 584 g.Results show that the system quality is good,the onaxis modulation transfer function(MTF)is above 0.3 at 120 lp/mm,the off-axis MTF is greater than 0.2 at 120 lp/mm,the MTF for each field of view is greater than 0.5 at 40 lp/mm,and the distortion is less than 1%.According to the zoom motion equation,the programming calculation was done by Matlab software,and the cam curve reflecting the motion process of the zoom group and the compensation group was obtained.In the process of zooming,the image surface is relatively stable and the focusing is smooth.
引文
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[2]WANG Xiangjun,WANG Min.Design of zoom con-trol system for small pod of UAV[J].Photo ElectricEngineering,2013,40(1):139-144.王向军,王敏.适用于无人机小型吊舱的变焦控制系统设计[J].光电工程,2013,40(1):139-144.
[3]GE Jingjing,LIN Zhaorong,ZHU Dakai.Design ofairborne small medium wave infrared continuouszoom system[J].Journal of Applied Optics,2013,34(5):728-732.葛婧菁,林招荣,朱大凯.机载轻小型中波红外连续变焦系统设计[J].应用光学,2013,34(5):728-732.
[4]LIU Xiaomin.Miniaturization of zoom lens[J].Journal of Applied Optics,1982,3(3):8-14.刘肖民.变焦距物镜的小型化[J].应用光学,1982,3(3):8-14.
[5]YAO Qinghua,YAN Juncen.Design of high zoomratio zoom optical system[J].Journal of AppliedOptics,2015,36(5):667-672.姚清华,闫俊岑.高变倍比变焦光学系统设计[J].应用光学,2015,36(5):667-672.
[6]TAO Chunkan.Optical design of zoom lens system[M].Beijing:National Defend Industry Press,1988.陶纯堪.变焦距光学系统设计[M].北京:国防工业出版社,1988.
[7]JIN Fengxi,JIN Hujie.The best choice of the formof zoom lens[J].Optical Instrument,2004(1):34-38.金逢锡,金虎杰.变焦镜头结构形式的最佳选择方法[J].光学仪器,2004(1):34-38.
[8]SHEN Weimin.Parameter selection and design oflight and small high resolution space optical system[J].Infrared and Laser Engineering,2006(S2):38.沈为民.轻小型高分辨空间光学系统的参数选取和设计[J].红外与激光工程,2006(S2):38.
[9]DU Ke,CHENG Xuemin,HAO Qun.Design of op-tical zoom system for deep-sea detection[J].Laser &Optoelectronics Progress,2013,50(9):092201.杜柯,程雪岷,郝群.深海探测变焦光学系统的设计[J].激光与光电子学进展,2013,50(9):092201.
[10]CHEN Xin,FU Yuegang.Optimal design of camcurve of zoom system[J].Journal of Applied Op-tics,2008,19(1):45-47.陈鑫,付跃刚.变焦系统凸轮曲线的优化设计[J].应用光学,2008,19(1):45-47.
[2]WANG Xiangjun,WANG Min.Design of zoom con-trol system for small pod of UAV[J].Photo ElectricEngineering,2013,40(1):139-144.王向军,王敏.适用于无人机小型吊舱的变焦控制系统设计[J].光电工程,2013,40(1):139-144.
[3]GE Jingjing,LIN Zhaorong,ZHU Dakai.Design ofairborne small medium wave infrared continuouszoom system[J].Journal of Applied Optics,2013,34(5):728-732.葛婧菁,林招荣,朱大凯.机载轻小型中波红外连续变焦系统设计[J].应用光学,2013,34(5):728-732.
[4]LIU Xiaomin.Miniaturization of zoom lens[J].Journal of Applied Optics,1982,3(3):8-14.刘肖民.变焦距物镜的小型化[J].应用光学,1982,3(3):8-14.
[5]YAO Qinghua,YAN Juncen.Design of high zoomratio zoom optical system[J].Journal of AppliedOptics,2015,36(5):667-672.姚清华,闫俊岑.高变倍比变焦光学系统设计[J].应用光学,2015,36(5):667-672.
[6]TAO Chunkan.Optical design of zoom lens system[M].Beijing:National Defend Industry Press,1988.陶纯堪.变焦距光学系统设计[M].北京:国防工业出版社,1988.
[7]JIN Fengxi,JIN Hujie.The best choice of the formof zoom lens[J].Optical Instrument,2004(1):34-38.金逢锡,金虎杰.变焦镜头结构形式的最佳选择方法[J].光学仪器,2004(1):34-38.
[8]SHEN Weimin.Parameter selection and design oflight and small high resolution space optical system[J].Infrared and Laser Engineering,2006(S2):38.沈为民.轻小型高分辨空间光学系统的参数选取和设计[J].红外与激光工程,2006(S2):38.
[9]DU Ke,CHENG Xuemin,HAO Qun.Design of op-tical zoom system for deep-sea detection[J].Laser &Optoelectronics Progress,2013,50(9):092201.杜柯,程雪岷,郝群.深海探测变焦光学系统的设计[J].激光与光电子学进展,2013,50(9):092201.
[10]CHEN Xin,FU Yuegang.Optimal design of camcurve of zoom system[J].Journal of Applied Op-tics,2008,19(1):45-47.陈鑫,付跃刚.变焦系统凸轮曲线的优化设计[J].应用光学,2008,19(1):45-47.