单中心超广角手机镜头设计

Design of Single-Center and Ultra-Wide-Angle Mobile Phone Lenses

为实现大视场、低成本、高解析力的高性能手机镜头光学系统,基于ZEMAX软件设计了2个采用不同滤光方式的单中心超广角手机镜头光学系统,匹配于曲面传感器。2个光学系统分别由4片同心塑料透镜和曲面滤光片或红外截止膜构成,系统F数均为1.8,视场角均为130°,系统焦距均为2.64mm,系统总长均为4.1mm。中心视场的调制传递函数(MTF)值在奈奎斯特频率为200lp/mm处大于0.5,在奈奎斯特频率为400lp/mm处大于0.2;0.7以内视场的MTF值在奈奎斯特频率为400lp/mm处大于0.2。全视场相对照度大于0.42。最大均方根半径小于3.75μm,符合手机镜头成像要求,实现了超广角、短焦、紧凑型光学系统设计,可加工性强,成像质量高。

Herein,to achieve high-performance mobile phone lens optical system with a large view field,low cost,and high resolution,two single-center and ultra-wide-angle optical systems of mobile phone lens with different filtering methods are designed based on ZEMAX software,which are matched with a curved sensor.The two optical systems comprise four concentric plastic lenses,a curved surface filter,or an IR-CUT film with the systemF-number of 1.8,view field of 130°,and focal and total lengths of the system of 2.64 mm and 4.1 mm,respectively.The modulation transfer function(MTF)value of the central view field is greater than 0.5 and 0.3 at 200-and 400-lp/mm Nyquist frequencies,respectively.The MTF value of less than 0.7 view field is greater than 0.2 at 400-lp/mm Nyquist frequency.The relative illumination of full view field is greater than 0.42.The maximum RMS radius is less than 3.75μm,which satisfies the requirements of mobile phone lens imaging.The design of an ultra-wide-angle,short focus,and compact optical system is accomplished with high machinability and high imaging quality.