Design of zoom projection lens with large aperture and wild view

To meet the market demand of large aperture and wide field zoom projection lens, we designed a zoom lens based on ZEMAX optical software.The zoom range is 16.27 mm~22.77mm, its field of view (FOV) is 63.7°~47.8°, the F number is 1.75-1.95.Working with a 1.55 cm (0.61 inch) LCOS projection display chip, a 190.5 cm(75 inch) picture can be projected at a distance of 2000mm.The total length of optical system is less than 160mm, it is composed of 10 lenses, which include 8 glass lenses and 2 plastic lenses.Design results show that at the space frequency limit 71lp/mm, the full FOV MTF is greater than 0.5 and the field curvature of each zoom section is within 0.1mm, the distortion is within 3%, and the imaging quality is good.Finally, we conducted the tolerance analysis of the optical system, and obtained a set of loose machining tolerances.