Patent ID: 8431942

Claim:
A light emitting diode (LED) device comprising: an LED die having a light emitting top surface; a package containing the LED die, the package comprising a body and electrodes connected to the LED die; and a rounded rectangular lens mounted on the body, the lens having rounded corners in a plane that is parallel to the top surface, the lens having a substantially semicircular surface along a diagonal cross-section of the lens that is orthogonal to the top surface, the diagonal cross-section of the lens having a first total width that is less than a total diagonal cross-section width of the body, the substantially semicircular surface having a maximum height H substantially above a centerpoint of the top surface of the LED die, the lens having a non-semicircular bullet shaped surface along a width cross-section of the lens that is orthogonal to the top surface, bisecting the lens, the bullet shaped surface having a second total width smaller than the first total width, the bullet shaped surface having a maximum height H above the top surface of the LED die coinciding with the maximum height H of the substantially semicircular surface, a surface of the lens smoothly transitioning between the substantially semicircular surface and the non-semicircular bullet shaped surface with no sharp corners above the top surface of the LED die, wherein the lens produces a substantially Lambertian light emission pattern when the LED die is energized.