Optical projection system and electronic equipment

The invention discloses an optical projection system and electronic equipment. The optical projection system sequentially comprises a first lens group, a second lens group, a third lens group and a fourth lens group from an amplification side to a reduction side, the focal power of the first lens group is negative, the focal power of the second lens group is negative, the focal power of the third lens group is positive, and the focal power of the fourth lens group is positive; the ratio of the total optical length of the optical projection system to the focal length f of the optical projection system is larger than or equal to 9.5 and smaller than or equal to 11. 本申请公开了一种光学投影系统及电子设备，该光学投影系统从放大侧至缩小侧依次包括第一透镜组、第二透镜组、第三透镜组及第四透镜组；所述第一透镜组的光焦度为负，所述第二透镜组的光焦度为负，所述第三透镜组的光焦度为正，所述第四透镜组的光焦度为正；所述光学投影系统的光学总长度与所述光学投影系统的焦距f的比值大于或等于9.5且小于或等于11。