Patent ID: 8482851
Filing Date: 2013-07-09
Classification: G02B,G03B

Abstract:
1. A projection optical system that enlarges and projects an original image on a reduction-side conjugate plane onto a magnification-side conjugate plane, comprising: a first optical system that forms an intermediate image conjugate to the original image; and a second optical system that forms a final image conjugate to the intermediate image on the magnification-side conjugate plane, wherein the first and second optical systems are arranged in order from a reduction side, the first optical system includes a plurality of lenses, the second optical system includes a reflecting mirror having a concave surface with an aspheric shape, and a first lens surface, which is a reduction-side surface, and a second lens surface, which is a magnification-side surface, of a lens closest to a magnification side in the first optical system satisfy the following conditional expressions: where h indicates a height from an optical axis to an arbitrary point on the first lens surface or the second lens surface, h