Patent ID: 8120048

Claim:
An LED (light emitting diode) unit, comprising: an LED; and a lens mounted on the LED, the lens comprising a light-incident face adjacent to the LED, a light-emergent face remote from the LED, and a light-reflecting face between the light-incident face and the light-emergent face, wherein light emitted from the LED with a small angle is refracted by the light-incident face and the light-emergent face out of the LED unit, light emitted from the LED with a large angle is sequentially refracted by the light-incident face, reflected by the light-reflecting face and refracted by the light-emergent face out of the LED unit; wherein the light-incident face comprises a first light-incident face facing the LED, and the light-emergent face comprises a first light-emergent face located opposite to the first light-incident face; and wherein the first light-incident face is a continuously curved face which has a curvature, along a bottom-to-top direction of the lens, firstly decreasing gradually to a first value; then increasing gradually to a second value; then decreasing gradually again to a third value; and then increasing gradually again.