手机虹膜识别镜头设计

随着近年来图像传感器的快速商用化以及生物识别算法的发展，虹膜识别功能得以应用于移动终端设备。获取虹膜图像是虹膜识别的关键一步，运用ZEMAX光学设计软件设计了一款适用于手机的虹膜识别镜头。该镜头采用豪威科技公司OmniVision_OV2281传感器，采用三片式非球面光学塑料设计，F数为2.3，全视场角为34°，在1/2奈奎斯特频率220 lp/mm处MTF值均大于0.39，且系统总长仅3 mm。根据ZEMAX像质评价方法以及公差分析结果可知，该镜头各项光学指标优良，具有像质好、体积小，质量轻、价格低、容易加工等特点。

Design of iris recognition lens of mobile phone

With the rapid commercialization of image sensors and the development of biometric recognition algorithms in recent years,iris recognition function has been applied to mobile terminal devices.The iris image acquisition is the first and the key step in iris recognition.Here one group of iris recognition lens was designed for mobile phones by the ZEMAX optical design software.This design is composed of three chip aspherical lenses of optical plastic,with OmniVision_OV2281 sensor of Howe technologies.With designed F parameter of 2.3 and a viewing angle of 34°,the MTF values can all be greater than 0.39 at 1/2 Nyquist frequency 220 lp/mm.And the length of the whole system is only 3 mm.According to the ZEMAX image quality evaluation method and tolerance analysis,the optimized results show that the designed lens can match well with all the optical requirements,and has the characters of good image quality,small volume,light weight,low cost and easy processing.