Patent ID: 7582913

Claim:
A light-emitting diode (LED) that provides high intensity, homogeneous illumination, the LED comprising, in combination: a single light-emitting diode chip having a light emitting region and an optical axis; and a single lens that directly contacts and covers at least the light emitting region of the light-emitting diode chip wherein the lens has a structure that is circularly symmetrical and an action surface from which light is emitted that is a continuously curved surface including a concave portion provided in the vicinity of the optical axis of the light-emitting diode chip and defined as a divergent surface surrounded by a convergent surface in which the divergent surface and the bottom of the light-emitting diode chip have a height difference which increases outwardly, and the convergent surface and the bottom of the light-emitting diode chip have a height difference which decreases outwardly so that light emitted from the light-emitting diode chip is deflected away from the optical axis thereof as it goes through the divergent surface and is deflected toward the optical axis as it goes through the convergent surface, and so that the light-emitting region emits light through the single lens at a subtended angle ranging from 45 to 75 degrees whereby the light-emitting diode provides homogeneous illumination at an intensity ranging from 90% to 100% of that of the light-emitting diode chip alone.