Design on projection objective of portable projector

In view of the shortcomings of current projectors such as large light source power consumption, poor light projection stability and large system structure, using Zemax software, a large field of view(FOV), short focal length and compact projection system for portable projectors was designed. After optimization, the design structure was finally obtained with good imaging quality. At the spatial frequency of 80 lp/mm, the central FOV modulation transfer function(MTF) is ≥ 0.7, the 0.8 FOV MTF is ≥ 0.6, the edge FOV MTF is≥ 0.48, and the distortion is less than 3%, which can satisfy the design indicators given. Moreover, the energy concentration is greater than 85% in the specified and required pixel size range, the overall illumination curve is higher than 90% within 0.8 FOV, the energy concentration is high, and the illumination uniformity is good, which can be well matched with the portable projector for use. Key words: short-focus; Zemax; wide field; projection optics