IMAGING OPTICAL SYSTEM, OPTICAL APPARATUS AND IMAGE PROJECTION APPARATUS

摘要

An imaging optical system, which images an image on one conjugate surface of an enlargement side conjugate surface and a reduction side conjugate surface onto the other conjugate surface, includes, in order from the reduction side conjugate surface to the enlargement side conjugate surface, a refractive optical system and a reflective optical system. The refractive optical system forms an intermediate real image at an intermediate imaging position inside the refractive optical system. The reflective optical system includes a convex mirror disposed closest to the enlargement side conjugate surface. The predetermined conditional expression is satisfied.

主权项

1. An imaging optical system that images an image on one conjugate surface of an enlargement side conjugate surface and a reduction side conjugate surface onto the other conjugate surface, the imaging optical system comprising:
in order from the reduction side conjugate surface to the enlargement side conjugate surface, a refractive optical system; and a reflective optical system, wherein the refractive optical system forms an intermediate real image at an intermediate imaging position inside the refractive optical system, wherein the reflective optical system includes a convex mirror disposed closest to the enlargement side conjugate surface, and wherein the following conditional expression is satisfied:
0.01≦|fL/fM|≦0.50 where fL is a focal length of the refractive optical system, and fM is a focal length of the reflective optical system.