Iris identification optical lens with high precision

To obtain high-resolution iris images in the iris recognition system, a high-precision iris image acquisition camera lens is designed, whose focal length is 14.2 mm, distortion is less than 0.15%, image space numerical aperture (NA) is 0.26, image diameter is 5.35 mm, working distance is 130 mm and objectimage conjugate distance is 150 mm. This optical system can acquire high-resolution image with MTF 0.3 at 120 lp/mm over 0.7 field of view. The camera lens is composed of 4 spherical lenses, which is simple and suitable for industrial production. All the optical performances of productions are consistent with the predicted results analyzed by Zemax.