Patent ID: 7411747

Claim:
An infrared laser light source spreader comprising: a first biconvex lens; a convex-concave lens; and a biconcave lens disposed between the first biconvex lens and the convex-concave lens; wherein the first biconvex lens has a first radius of curvature in a range from 17.45 mm to 21.14 mm, a second radius of curvature in a range from 20.49 mm to 48.42 mm, and a center thickness in a range from 3.37 mm to 3.95 mm; the biconcave lens has a first radius of curvature in a range from 10.10 mm to 14.55 mm, a second radius of curvature in a range from 19.91 mm to 45.54 mm, and a center thickness of 1.85 mm; the convex-concave lens has a first radius of curvature in a range from 35.22 mm to 68.31 mm, a second radius of curvature in a range from 14.04 mm to 20.42 mm, and a center thickness in a range from 2.28 mm to 3.47 mm; and the first biconvex lens and the biconcave lens are separated by a distance in a range from 3.32 mm to 4.20 mm, the biconcave lens and the convex-concave lens are separated by a distance in a range from 2.99 mm to 4.52 mm.