Endoscope optical system capable of expanding depth of field

The invention discloses an endoscope optical system capable of expanding the depth of field, which can expand the depth of field and well correct aberration, and comprises an objective optical system, an optical path segmentation module for segmenting a shot object image obtained by the objective optical system into two optical images with different focuses, and a camera module for obtaining the optical images with different depths of field. The objective optical system comprises a first negative lens, a first balsaming lens, a second balsaming lens, a third balsaming lens and a prism group, and two camera elements are placed at different positions of the prism group to obtain two clear images with different field depth ranges, so that field depth expansion is realized; the implementation method is simple, and depth-of-field expansion can be realized without a zoom module. 本发明公开了一种拓展景深的内窥镜光学系统，该系统能够拓展景深且能良好校正像差，包括物镜光学系统、将物镜光学系统获得的被摄体像分割为焦点不同的两个光学像的光路分割模块、用于获取不同景深的光学像的摄像模块。物镜光学系统包括第一负透镜、第一胶合透镜、第二胶合透镜、第三胶合透镜和棱镜