Reflector for a projection light source

An illumination light source unit comprising a light source lamp having a light emitting part and a reflector for outputting parallel light rays by reflecting light rays from the light emitting part, said reflector comprising:

• a first parabolic reflector having a forward end, a rearward end and a focal point coincident with the center of the light emitting part and not having a portion corresponding to the external contour of the light source lamp and being centered around the optical axis for reflecting light rays from the light source lamp;
• a second parabolic reflector provided at the rearward end of the first parabolic reflector and having a parabolic surface with a focal point eccentric from the center of the light-emitting part for reflecting light rays from the light-emitting part toward the forward end of the first parabolic reflector;
• and
• a bottomless circular truncated conic reflector provided at the forward end of the first parabolic reflector for reflecting light rays reflected by the second parabolic reflector in a direction parallel to the optical axis.