Patent ID: 8858023

Claim:
An illumination device, comprising: an array of a plurality of solid state light sources; an array of a plurality of collimating lenses, each collimating lens being aligned with a solid state light source to collimate light emitted from the solid state light source into collimated light; a pair of fly-eye lenses including a first fly-eye lens and a second fly-eye lens, wherein the collimated light from the collimating lens array passes through the first and second fly-eye lenses successively; and a pair of Fresnel lenses including a first Fresnel lens and a second Fresnel lens located between the collimating lenses array and the first fly eye lens, receiving the collimated light from the collimating lens array and transmitting it to the pair of fly-eye lenses, wherein a focus point of the first Fresnel lens is located close to or overlapped with a focus point of the second Fresnel lens.