Patent ID: 8545058

Claim:
A lens comprising: a light incident surface; and a light exiting surface, the light exiting surface comprising: a first concave surface located at a center of the light exiting surface for diverging light exiting therefrom; a first convex surface and a second convex surface arranged at two opposite sides of the first concave surface respectively for converging the light exiting therefrom, the first convex surface, the first concave surface, and the second convex surface connecting in sequence along a first direction; a first curved surface and a second curved surface arranged at another two opposite sides of the first concave surface respectively, the first curved surface, the first concave surface, and the second curved surface connecting in sequence along a second direction, the second direction being substantially perpendicular to the first direction; wherein, the light diverging power of the first concave surface on the first direction is larger than the light diverging power of the first concave surface on the second direction, the light converging power of each of the first convex surface and the second convex surface on the first direction is smaller than the light converging power of each of the first convex surface and the second convex surface on the second direction, the first curved surface and second curved surface diverge the light exiting therefrom on the first direction, and converge the light exiting therefrom on the second direction; and wherein the first concave surface is an ellipsoidal surface with a long axis thereof substantially parallel to the second direction, and a short axis thereof substantially parallel to the first direction.