Patent ID: 8308305

Claim:
A projector, comprising: a light source device; a color-separating optical system that separates a light beam irradiated by the light source device into a plurality of color light components; a plurality of optical modulators that modulate each of the separated plurality of color light components in accordance with image information; a color-combining optical device that combines optical images modulated by the plurality of optical modulators; a projection optical device that projects the combined optical images in an enlarged manner; and an integrator illuminating optical system including: a first lens array having a plurality of lens elements that separate the light beam irradiated by the light source device into a plurality of sub-beams; a second lens array having a plurality of lens elements of a number corresponding to that of the plurality of lens elements of the first lens array; a superposing lens that superposes a plurality of sub-beams irradiated from the second lens array on image formation areas of the optical modulators; and an optical filter that reflects a predetermined spectral component of the light beam irradiated by the light source device and transmits the other spectral component, the optical filter being disposed in an optical path between the second lens array and the superposing lens at a position where a light beam reflected at least one of the plurality of optical modulators is reflected by a light-irradiation side surface of the optical filter as convergent light, wherein the optical filter is disposed such that the light-irradiation side surface is inclined by a predetermined angle relative to a plane orthogonal to an optical axis of the light beam irradiated by the light source device, and when one of a vertical side and a horizontal side is larger than the other in an aspect ratio of each of the optical modulators, the optical filter is set to be inclined in a direction along the other of the vertical side and the horizontal side.