高精度虹膜识别光学镜头的研制

Iris identification optical lens with high precision

针对虹膜识别系统中难于获取高分辨率的虹膜图像问题,设计一款高精度虹膜图像采集摄像镜头。镜头焦距14.2mm,畸变小于0.15%,像方数值孔径为0.26,像面直径为5.35mm,工作距离130mm,物像共轭距为150mm。光学系统可获得高分辨率图像,在0.7视场光学传递函数MTF在120lp/mm时大于30%。镜头由4片球面透镜构成,结构简单,适合产业化生产,各项光学指标检测结果达到设计要求。

To obtain high-resolution iris images in the iris recognition system,a high-precision iris image acquisition camera lens is designed,whose focal length is 14.2 mm,distortion is less than 0.15%,image space numerical aperture（NA） is 0.26,image diameter is 5.35 mm,working distance is 130 mm and object-image conjugate distance is 150 mm.This optical system can acquire high-resolution image with MTF 0.3 at 120 lp/mm over 0.7 field of view.The camera lens is composed of 4 spherical lenses,which is simple and suitable for industrial production.All the optical performances of productions are consistent with the predicted results analyzed by Zemax.