Patent ID: 7329007

Claim:
A projector, comprising: an illumination device that emits an illumination light; a color separation system that separates the illumination light emitted from the illumination device into a blue light, a red light, and a green light, and that guides the blue light and the red light, respectively, to first and second optical paths, and the green light to a third optical path that includes a relay system; first through third light modulation devices that are provided, respectively, in the first through third optical paths, and that are illuminated by the blue light, the red light, and the green light, respectively; a light combining system that has a first dichroic filter that reflects one of the blue light and the red light, and a second dichroic filter that reflects the green light which are placed in a crossed state, and that combines image lights of respective colors exiting from the first through third light modulation devices to go incident on the first and second dichroic filters in specific directions that differ from each other; a projection system that projects a combined light exiting from the light combining system while correcting chromatic aberrations of magnification of the blue light and the red light with respect to the green light to have a same sign; an optical adjustment portion that adjusts a size of an image light corresponding to the green light of the combined light exiting from the light combining system in response to a size of image lights corresponding to the blue light and the red light; and the light combining system including a combination of four rectangular prisms, each prism having an isosceles right triangular bottom surface, and the four rectangular prisms being joined at their apex such that a specific tilting angle is produced between first and second surface regions that are halves of the second dichroic filter divided by the first dichroic filter crossing the second dichroic filter.