4P超薄800万像素镜头设计

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3.5 m。采用索尼公司的IMX111 型号CMOS 探测器,最大分辨率为32642448。通过模拟计算,得到该手机镜头的离焦量为144m。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。

Camera design of 4P slim 8 megapixel lens

To achieve good performance with short length, an ultra-thin cell phone lens was designed with optical plastic as lens material by optimizing the initial structure. The lens included four pieces with even aspheric, and the aperture was placed in front. The length of the lens was 4.49mm, the F number was 2.4, the viewing angle was 65.5, and the focal length was 3.71 mm. The MTF at the Nyquist frequency and half-Nyquist frequency of the detector was respectively greater than 0.14 and 0.46 and distortion of the lens was less than 1.5%. The RMS radius of different fields was less than 3.5 m. The CMOS sensor IMX111 from SONY was adopted, and the maximum resolution was 3 2642 488. By simulation, the defocusing amount of the cell phone was 144 m. By focusing, high quality images can be obtained when the object distance was greater than 10 cm. Through the sensitivity analysis, the tolerance of the lens met the processing requirements. With short length and aspherical plastic lens, the production cost is low, the imaging performance is good, which meet the practical requirements of cell phone lens.