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针对手机镜头很难同时实现高成像质量和短总长的实际问题,通过对初始结构进行优化设计,得到一款全部采用光学塑料为透镜材料的超薄手机镜头。镜头采用四片式结构,光阑位于镜头前方,镜片全部采用偶次非球面。该镜头总长4.49 mm,F数为2.4,视场角为65.5°,焦距为3.71 mm,在探测器Nyquist频率处MTF均大于0.14,在半Nyquist频率处MTF均大于0.46,且畸变小于1.5%。光学系统各视场的均方根半径小于3.5μm。采用索尼公司的IMX111型号CMOS探测器,最大分辨率为3264×2448。通过模拟计算,得到该手机镜头的离焦量为144μm。通过调焦,可以在物距大于10cm时,得到像质较好的图像。通过灵敏度分析,镜头公差满足加工要求。该镜头设计长度较短,采用非球面塑料透镜,生产成本较低,成像性能良好,满足手机镜头的使用要求。
In view of the fact that the mobile phone lens is hard to realize the high imaging quality and the short total length at the same time, an ultra-thin mobile phone lens adopting optical plastic as the lens material is obtained through the optimized design of the initial structure. The lens uses a four-piece structure, the diaphragm is located in front of the lens, all the lenses use even aspheric. The lens has a total length of 4.49 mm, an F-number of 2.4, a field of view of 65.5 ° and a focal length of 3.71 mm. MTF values are greater than 0.14 at the Nyquist frequency of the detector. MTF values are greater than 0.46 at half-Nyquist frequency with less than 1.5% distortion. Optical system of each field of view of the root mean square radius of less than 3.5μm. Sony’s IMX111 model CMOS detector, the maximum resolution of 3264 × 2448. Through the simulation calculation, the defocused amount of the cell phone lens is 144 μm. By focusing, you can get a better image quality when the object distance is more than 10cm. Through the sensitivity analysis, lens tolerances to meet the processing requirements. The lens design is shorter, the use of aspherical plastic lenses, lower production costs, imaging performance is good, to meet the requirements of mobile phone lens.