Foldable ultrathin optical imaging system

The invention discloses a foldable ultrathin optical imaging system comprising an annular aperture ultrathin optical imaging lens and an imaging plane (7) and characterized in that the annular aperture ultrathin optical imaging system comprises annular light passing apertures (11)-(12) and first and second plane mirrors (31)-(32) and (51)-(52) on a front surface; and first and second high-order aspheric mirrors (21)-(22), (41)-(42) and a high-order aspheric transmission surface (61)-(62) on a rear surface. Compared with the prior art, the foldable ultrathin optical imaging system of the invention uses multiple reflection light folding technology, and has a small volume and compact structure. An image surface is kept at a distance from the rear surface of a lens. The structure is designed in such a way that the lens is less likely to be affected by external stray light. The lens has a large depth of field in an acceptable field of view, and has a wide operating range. 本发明公开了种折叠式超薄光学成像系统，包括环形孔径超薄光学成像镜头和成像平面(7)，