Patent ID: 8641208

Claim:
A refractive optics which forms part of a projection optics including a reflective optics having at least one reflecting mirror and which has a group of lenses, the refractive optics comprising: a non-circular lens which is a lens in the group of lenses provided on a side closer to the reflective optics; and a holder which has an inner wall surface holding the non-circular lens and which has an annular cross section, wherein the non-circular lens has an optical axis center coinciding with an optical axis center of the refractive optics, and has a non-circular shape forming part of an imaginary circular region whose center is the optical axis center of the refractive optics, the optical axis center of the non-circular lens does not coincide with a center axis of a cylinder formed by the inner wall surface, and the projection optics further includes imager output light guide circular lenses having optical axes that coincide with the optical axis center of the refractive optics provided on a side closer to an image light generator, and the diameter of the imaginary circular region is set larger than the diameter of any of the imager output light guide circular lenses.