Objective lens design of fiber image-transmitting bundle

The structures and applications of three telecentric systems in the image space are described. The traditional single group telecentric structure in the image space and “negative-positive” telecentric structure in the image space were made respectively during the design of the objective lens for the fiber image-transmitting bundle. The two schemes were compared. It is found that the “negative-positive” telecentric structure in the image space meets the demands of the off-axis aberration correction and image plane illumination uniformity at its image plane, and makes the lens compact. After the optimization with the optical design software Zemax, a designed lens sample is fabricated, whose operation wavelength, focal length, FOV and relative aperture are 0.38μm-0.78μm, 1.92mm, 60° and 1∶4 respectively. The result shows that MTF value of the lens is greater than 0.8 at the spatial frequency of 46lp/mm.