Patent ID: 9454070
Filing Date: 2016-09-27
CPC Classification: G02B,G03B

Claim Text:
1. A projection optical system that projects an image displayed on an image display device arranged on a reduction-side conjugate plane onto a magnification-side conjugate plane, as a magnified image, the projection optical system comprising: a refractive optical system; and a reflective optical system having negative refractive power in this order from a reduction side, wherein the following conditional formula (1) is satisfied: L: a distance on an optical axis between the reflective optical system and the magnification-side conjugate plane, D: a diagonal length of the magnified image, ωmin: a minimum angle of incidence of a chief ray entering the magnification-side conjugate plane, and ωmax: a maximum angle of incidence of the chief ray entering the magnification-side conjugate plane.