Patent ID: 7130114

Claim:
A projector comprising: a display device; and an optical system which projects light from the display device, wherein the optical system comprises: plural reflective surfaces; and a refractive optical system introducing light from a light source to the reflective surfaces, wherein the reflective surfaces includes first, second, third and fourth reflective surfaces each having a curved surface, and the first, second, third and fourth reflective surfaces are arranged so that: the light introduced from the refractive optical system reflects on the first, second, third and fourth reflective surfaces in this order the light reaching the first reflective surface from the refractive optical system passes between the second and third reflective surfaces; the light reaching the second reflective surface from the first reflective surface intersects with the light reaching the fourth reflective surface from the third reflective surface; and the light reflected on the fourth reflective surface passes between the second and third reflective surfaces.