Designing an ultra-wide-angle microlens for a capsule medical endoscope

Requirements for the optical tract of a capsule medical endoscopic system with a frontal location of the object under research are summarized. It is shown that the optical layout of a microlens built from easy-to-fabricate modern plastics not only allows satisfying generalized requirements, but also opens up the possibility of obtaining a significantly higher-quality image in simple-design lenses compared with well-known analogs. This is confirmed by the presented results of calculating a microlens with a rela-tive aperture of $1: 2.4$ and an angular field of view of $2\omega=170^{\circ}$, which forms an image with a diameter of $2.7$ mm with a resolution of at least $188~mm^{–1}$, and a contrast of $0.5$.