Optical device with a function of homogenizing and color separation, and optical illumination system for a projector using the same

Disclosed herein is an optical device with a function of homogenizing and color separation and an optical illumination system for a projector whose size can be reduced by use of the optical device. The optical device with a function of homogenizing and color separation according to the present invention has a shape of rod, makes a distribution of light uniform by totally reflecting the incidence light at a boundary inside the device repeatedly, and separates the incidence light into light of different colors based on a wavelength band, the light of different colors outputted through different optical paths which are not overlaid one another. The optical illumination system for the projector using the optical device with a function of homogenizing and color separation according to the present invention has remarkable advantages in that the miniaturization and lightweight of the projector can be accomplished and picture quality can be improved.