PROJECTION OPTICAL SYSTEM AND PROJECTION-TYPE DISPLAY APPARATUS

摘要

In 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 includes a refractive optical system and a reflective optical system having negative refractive power in this order from a reduction side. Further, the following conditional formula (1) is satisfied:;−0.0015≦(1/tan(ωmax)−0.16)×(θL/θM−0.27)   (1).

主权项

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:
−0.0015≦(1/tan(ωmax)−0.16)×(θL/θM−0.27)   (1), where ωmax: a maximum angle of incidence of a chief ray entering the magnification-side conjugate plane, θL: an angle between a chief ray from a center of a display surface of the image display device and an optical axis when the chief ray exits from the refractive optical system, and θM: an angle between the chief ray from the center of the display surface and the optical axis when the chief ray exits from the reflective optical system.