Patent ID: 7172318

Claim:
A light tunnel, for reflecting a light, comprising a first reflector, a second reflector, a third reflector, a fourth reflector, a light entrance, and a light exit, wherein the light enters the light tunnel from the light entrance so as to be reflected by the first, second, third, and fourth reflectors and emitted from the light exit, and wherein the first and second reflectors are rectangular, opposite and parallel, the third and fourth reflectors are opposite to each other, a distance between the third and fourth reflectors at the light entrance is different from a distance between the third and fourth reflectors at the light exit, the distance between the third and fourth reflectors at the light entrance is less than the length of each of the first and second reflectors, and the distance between the third and fourth reflectors at the light exit is less than length of each of the first and second reflectors.