500万像素虹膜识别镜头设计

Design of 5 mega-pixel imaging lens for iris recognition

摘要: 随着虹膜识别技术的深入研究，虹膜识别技术有望在移动支付领域被广泛运用。针对目前虹膜识别镜头体积和质量较大，使用Zemax光学设计软体设计一款三片式非球面结构紧凑的500万像素虹膜识别镜头。该镜头工作距离是170 mm ~250 mm，F^#为3，镜头总长为4.43 mm，光学畸变小于2%，TV畸变小于0.5%，相对照度最低大于0.6。匹配使用APTINA公司一款0.635 cm(1/4英寸)CMOS, 奈奎斯特频率为357 lp/mm, 在1/2奈奎斯特频率处MTF均大于0.2，总像素可达到500万像素。最后对镜头进行了像质评价和容差分析，结果表明，该镜头满足各项光学指标要求。

Abstract: With deep research, iris recognition technology is expected to be widely used in field of mobile payment. In view of big volume and quality of current iris recognition lens, Zemax optical design software is used to design compact 5 mega-pixel iris recognition lens composed of three-piece non-spherical structure. Lens working distance is 170 mm ~ 250 mm, F number is 3, total length of lens is 4.43 mm, optical distortion is less than 2%, TV distortion is less than 0.5%, relative illumination is less than 0.6. Matching 1/4" CMOS made by APTINA, Nyquist frequency of 357 lp / mm, at 1/2 Nyquist frequency, MTF are greater than 0.2, total pixel can reach 5 mega-pixel. Image quality evaluation and tolerance are analyzed. Results show that lens meet optical requirements.