| 摘要 |
本案系关于一种广角投影光学系统，于物件侧及影像侧间包括第一光学系统及第二光学系统，第一光学系统包括第一透镜组及第二透镜组。第二光学系统包括曼金镜。第一透镜组具正曲光力并包括孔径光栏于其中，提供与物件侧投射光线相匹配之光学特性并聚集光线至孔径光栏；第二透镜组位于第一透镜组之后并具正曲光力；曼金镜相对第一透镜组、孔径光栏及第二透镜组邻近影像侧，第一透镜组与第二透镜组共同形成畸变实像于曼金镜前，曼金镜具有穿透面及反射面，以使光线经二次折射及一次反射，俾产生放大不失真实像于萤幕，以薄型化并降低影像像差。;A wide-angle projection optical system includes, between an object side and an image side, a first optical system comprising a first lens group having an aperture stop therein and a second lens group, and a second optical system comprising a refracting surface and a reflecting surface in the form of a Mangin mirror. The first lens group has positive power, and the second lens group has positive power. The first lens group converges the light toward the aperture stop. The first lens group also provides optical characteristics to match with a light beam coming from the object side. The second lens group is disposed behind the aperture stop. The first and second lens groups are configured to form an aberrated real image before the Mangin mirror with positive power. The Mangin mirror is disposed closer to the image side than the first lens group, the aperture stop and the second lens group. The Mangin mirror consists of a refracting surface and a reflecting surface which refracts the light two times and reflects the light one time, thereby producing an enlarged and undistorted real image on a screen. As a result, the thinning of the wide-angle projection optical system is implemented, the image distortion is reduced, and the image quality is enhanced. |
