Patent ID: 8023193

Claim:
An illumination system, comprising: at least one coherent light source, capable of emitting a coherent beam; a light uniforming device, disposed on a transmission path of the coherent beam; a lenticular sheet module disposed on the transmission path of the coherent beam and between the coherent light source and the light uniforming device, the lenticular sheet module being annular-shaped, the lenticular sheet module comprising: a first lenticular sheet, comprising: a plurality of first rod-like lenticulars, side by side extending along a first extending direction; and a second lenticular sheet, disposed between the first lenticular sheet and the light uniforming device, the second lenticular sheet comprising: a plurality of second rod-like lenticulars, side by side extending along a second extending direction, wherein the first extending direction and the second extending direction make an angle greater than 0 degree, each of the first rod-like lenticulars has a first convex surface, each of the second rod-like lenticulars has a second convex surface, and a radius of curvature of each second convex surface is larger than or equal to a radius of curvature of each first convex surface; wherein a direction of the coherent beam exiting from the second lenticular sheet and a direction perpendicular to and away from the second lenticular sheet make an angle falling within a range from −30 degrees to 30 degrees; and a motor having a rotor, wherein the lenticular sheet module surrounds and is connected with the rotor for making the lenticular sheet module rotate about an axis passing through a center of the lenticular sheet module, and the first extending direction and the second extending direction of portions of the first rod-like lenticulars and the second rod-like lenticulars struck by the coherent beam rotate with respect to the coherent beam when the lenticular sheet module rotates.