Patent ID: 6325514
Filing Date: 2001-12-04
Classification: G02B,G03B

Abstract:
An apparatus which comprises an illuminator including a plurality of light source units, each said light source unit having a luminous body and a reflector for reflecting light from the luminous body toward forward so as to form a component light beam, said plurality of light source units being arranged in a row so as to form a plurality of component light beams, an integrator composed of at least two fly-eye lens plates arranged along an optical axis, that is transverse to said row, said integrator receiving incident light from each of the plurality of component light beams and forming an output, said integrator functioning to make the output more uniform than the incident light from each of the plurality of component light beams; and repositioning means for positioning the light beam from at least one of the light source units so as to approach the optical axis and so that the ratio of change, in the distance from the center of the light beam to the optical axis, is at least as great as the ratio of change in the size or diameter of the light beam as the light beam transits the integrator, said repositioning means comprising:Fresnel-shaped surfaces disposed in the optical axis between said light source units and said integrator and arranged in parallel to each other with an axial separation, each said Fresnel-shaped surface being divided into a same number of Fresnel-shaped rectangular surface sections as a number of said light source units.