Patent ID: 8562173

Claim:
An illumination system, comprising: a first solid-state light source for providing a first-wavelength light beam; a second solid-state light source for providing a second-wavelength light beam; a third solid-state light source for providing a third-wavelength light beam; a light combining element, having three inputting surfaces, an outputting surface, a second-wavelength-light-beam reflecting surface and a gap layer, wherein the second-wavelength-light-beam reflecting surface and the gap layer intersect with each other, the second-wavelength-light-beam reflecting surface and the gap layer are located between the three inputting surfaces and the outputting surface, the second-wavelength-light-beam reflecting surface is used to allow the first-wavelength light beam and the third-wavelength light beam to pass therethrough and reflect the second-wavelength light beam, and the first, the second and the third solid-state light sources are disposed in front of the three inputting surfaces respectively; a light homogenizing element, being disposed apart from the outputting surface; a first plate, being disposed apart from the outputting surface, and having a first phosphor and a first surface opposite the outputting surface, wherein the first phosphor is disposed on the first surface to be excited by the third-wavelength light beam to produce a fourth-wavelength light beam; and a first band-stop filter, being disposed between the outputting surface and the light homogenizing element, and being used to allow the first-wavelength light beam to the third-wavelength light beam to pass therethrough and reflect the fourth-wavelength light beam.