为了提高CCD 的灵敏度, 制造商在CCD 上增加微透镜阵列以提高其量子效率。由于微透镜对光线有汇聚作用, 要求像方光线入射角不能太大。普通镜头需增加后截距来减小光线像方入射角度, 使总长度增长, 且效果并不理想。本文提出采用像方远心光路设计航拍数码相机镜头, 使镜头边缘视场的像方光线都几乎以0°出射, 解决了带微透镜阵列的数码相机对光学镜头的特殊要求。通过像方远心光路设计的光学镜头与普通光学镜头对比, 证明了采用像方远心光路设计的镜头具有分辨率高, 像面照度均匀性好, 长度短, 重量轻等优点。

In order to improve the sensitivity of the CCD, the makers add microlens array on the CCD surface to increase the quantum efficiency. Because the microlens can focus the light ray, the rays’ incidence angel must be small. Normal lens decrease the incidence angle in image space by increase back focal distance, but the overall length increases and the imaging effect is not better. An aerial digital camera lens with telecentric beam path in image space is designed; the chief ray exit angle of the edge fields is 0°.In this way, the special requirements for lens of digital camera with microlens array is solved. It is proved that the telecentric beam path camera lens has high resolution, good illumination homogenization in image plane, short overall length and light weight.