US Patent 8651707 Optical lens for a LED having a quasi-elliptical shape

Disclosed is an optical lens for guiding light of an LED to produce a quasi-elliptical light pattern, and the optical lens has a lens body. The optical lens comprises an emitting surface and an incident surface. The emitting surface is a curved surface, and an illumination side of the emitting surface is in a quasi-elliptical shape with a long axis and a short axis, and the length of the long axis is a, and the length of the short axis is b, and the lens body has a lens height c. The length a of the long axis, the length b of the short axis, and the lens height c satisfy the relations of 1<a/b≦1.67 and 2≦a/c≦6. Therefore, an LED backlight source or a general illumination with a wide scope of applicability, a reduced number of LEDs and an improved illuminating uniformity.