介绍了含有谐衍射面的单片式胶囊内窥镜的设计方法。系统工作波段为0.486~0.656 μm，视场角为116.2°，光学系统总长为2.4 mm。另外，设计了含有3个球面透镜的胶囊内窥镜和含有非球面的单片式胶囊内窥镜，并和含有谐衍射面的单片式胶囊内窥镜进行了比较。结果表明，含有谐衍射面的单片式胶囊内窥镜可以达到含有3个球面透镜的胶囊内窥镜的成像质量，外形结构和含有非球面的单片式胶囊内窥镜一样简单。系统在频率40 lp/mm处的调制传递函数大于0.6。

A design method of the single-chip capsule endoscope with harmonic diffraction surface is introduced with the system working band of 0.486~0.656 μm and the field-of-view angle of 116.2°. And the total length of the optical system is 2.4 mm. Additionally, a capsule endoscope with three spherical lenses and a single-chip capsule endoscope with aspherical surface are designed, and a comparison is made between them and the single-chip capsule endoscope with harmonic diffraction surface. It is found that the single-chip capsule endoscope with harmonic diffraction surface can achieve the image quality of the capsule endoscope with three spherical lenses. and its construction is as simple as the single-chip capsule endoscope with aspherical surface. Its modulation transfer function is greater than 0.6 at the frequency of 40 lp/mm.