Patent ID: 8322866

Claim:
A dual lamp illumination system, comprising: a first light source and a second light source located in different positions, the first light source being capable of emitting a first light beam and the second light source being capable of emitting a second light beam; a light-deflecting device positioned in a first light path of the first light beam to reflect the first light beam and in a second light path of the second light beam to reflect the second light beam, so that the first light beam is combined with the second light beam to form a combined light beam; a light-homogenizing device being capable of receiving and homogenizing the combined light beam; and a lens assembly disposed between the light-deflecting device and the light-homogenizing device and comprising a first set of varifocal lenses neighboring the light-deflecting device and a second set of varifocal lenses neighboring the light-homogenizing device, wherein the first set of varifocal lenses and the second set of varifocal lenses are positioned substantially in symmetry, the first set of varifocal lenses comprises, numbered in order of location from the light-deflecting device to the light-homogenizing device, a first lens and a second lens, the second set of varifocal lenses comprises, numbered in order of location from the light-deflecting device to the light-homogenizing device, a third lens and a fourth lens, the position of the first lens is fixed, and the positions of the second lens, the third lens, and the fourth lens are adjustable in the lens assembly.