Patent ID: 8368093

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-emergent face is a continuously curved face which has a curvature firstly increasing gradually and then decreasing gradually along a bottom-to-top direction of the lens, the LED being located below the first light-emergent face; wherein the light-emergent face further comprises a second light-emergent face surrounding the first light-emergent face; wherein the first light-emergent face is discontinuous from the second light-emergent face, the lens defining a recessed portion spacing the first light-emergent face from the second light-emergent face; and wherein the second light-emergent is directly connected with the light-reflecting face.