Patent ID: 9658439
Date: 2017-05-23
CPC Classifications: F21V,F21Y,G02B

Claim:
1. A LED freeform surface illumination system comprising: a LED point light source located at origin (0, 0, 0) of a three-dimensional Cartesian coordinate system (x, y, z), wherein a light emitting angle φ of the LED point light source is divided into three regions, the three regions are 0≦φ≦φ a freeform surface lens having an axis along z axis of the three-dimensional Cartesian coordinate system (x, y, z), the freeform surface lens comprising: a light receiving surface located on a side of the freeform surface and parallel to a plane defined by x axis and y axis; wherein the freeform surface lens is disposed between the LED point light source and the light receiving surface, each of the three annular regions of the freeform surface corresponds with one of the three regions of the light emitting angle φ, and each of the three annular regions is capable of having lights of corresponded region of the light emitting angle φ passed therethrough to form a rectangular light spot having a length