WIDE-ANGLE PROJECTION OPTICAL SYSTEM

摘要

A wide-angle projection optical system includes, between an object side and an image side, a first optical system including a first lens group having an aperture stop and a second lens group disposed behind the aperture stop, and a second optical system including a Mangin mirror. The first and second lens groups have positive power. The first lens group provides optical characteristics to match with a light coming from the object side and converges the light toward the aperture stop. The first and second lens groups are configured to form an aberrated real image. The Mangin mirror is disposed closer to the image side than others. The Mangin mirror includes a refracting surface and a reflecting surface for refracting the light two times and reflecting the light one time, thereby producing an enlarged real image on a screen. Therefore, the image distortion is reduced, and the image quality is enhanced.

主权项

1. A wide-angle projection optical system, between an object side and an image side, the wide-angle projection optical system comprising:
a first optical system comprising:
a first lens group having positive power and comprising an aperture stop for providing optical characteristics to match with a light coming from the object side and converging the light toward the aperture stop; anda second lens group having positive power, wherein the second lens group is disposed behind the aperture stop; and a second optical system comprising:
a Mangin mirror disposed closer to the image side than the first lens group, the aperture stop and the second lens group, wherein the first lens group and the second lens group are configured to form an aberrated real image in front of the Mangin mirror, and wherein the Mangin mirror includes a refracting surface and a reflecting surface for refracting the light two times and reflecting the light one time, thereby producing an enlarged real image on a screen.