Projection lens group, projection optical system and augmented reality equipment

The invention discloses a projection lens group, a projection optical system and augmented reality equipment. The projection lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens along a light transmission direction. The first lens is a lens with negative focal power. The second lens is a lens with positive focal power. The third lens is a lenswith positive focal power. The fourth lens is a lens with negative focal power. The fifth lens is a lens with positive focal power. By employing the projection lens group, the projection optical system and the augmented reality equipment provided by the invention, the problem that the field angle of the existing augmented reality equipment is small is solved. 本发明公开一种投影镜组、投影光学系统以及增强现实设备，所述投影镜组沿光线传输方向依次包括第一透镜、第二透镜、第三透镜、第四透镜以及第五透镜；所述第一透镜为负光焦度透镜；所述第二透镜为正光焦度透镜；所述第三透镜为正光焦度透镜；所述第四透镜为负光焦度透镜；所述第五透镜为正光焦度透镜。本发明提供一种投影镜组、投影光学系统以及增强现实设备，解决了现有增强现实设备视场角较小的问题。