Color separation/synthetic optical system including two dichroic mirrors angled for correction of astigmatism

摘要

A color separation/synthetic optical system has a plurality of dichroic mirrors for allowing an incident light to be transmitted therethrough and to be reflected thereon every different rays of color light. A first dichroic mirror and a second dichroic mirror adjacent to the first dichroic mirror are arranged in a manner that they are inclined by predetermined angles, respectively. The second dichroic mirror is rotationally inclined about a vertical axis to a horizontal axis of rotational inclination of the first dichroic mirror. Thus, both astigmatic differences produced in the two mirrors are canceled.