Optical illumination system and image projection system including the same

摘要

An optical illumination system and an image projection system including the same include a light source, at least one illuminating lens and a Mangin mirror that illuminate light emitted from the light source on a predetermined reflective device, the Mangin mirror including a concave refracting surface that refracts and transmits light incident from the illuminating lens, and a convex reflecting surface disposed behind the concave refracting surface to internally reflect the light refracted by the concave refracting surface back toward the concave refracting surface and tilted with respect to the illuminating lenses. The light reflected from the convex reflecting surface and then refracted through the concave refracting surface propagates along a path that is different from a path of the light emitted from the illuminating lens.