Patent ID: 9372388
Filing Date: 2016-06-21
CPC Classification: G02B,G03B,H04N

Claim Text:
1. A projection optical system that projects from a first image plane on a reducing side to a second image plane on an enlargement side, comprising: a first optical system including a first refractive optical system and a second refractive optical system, the first refractive optical system including a plurality of lenses and forms light incident from the reducing side into a first intermediate image on the enlargement side, the second refractive optical system including a plurality of lenses and forms the first intermediate image on the reducing side into a second intermediate image on the enlargement side; a first reflective optical system that includes a first reflective surface with positive refractive power that is positioned closer to the enlargement side than the second intermediate image; a first stop disposed between the first image plane and the first intermediate image; and a second stop disposed between the first intermediate image and the second intermediate image, and wherein an optical distance EXP between an exit pupil and the first reflective surface when the first stop is a stop of the first optical system and an optical distance dw between the first image plane and the first reflective surface satisfy the following condition