Patent ID: 8419226
Filing Date: 2013-04-16
Classification: F21K,F21V,F21Y,H01L

Abstract:
1. 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, and 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-reflecting face has a continuous curvature; and wherein the light-reflecting face has an edge directly connected to the light-emergent face and an opposite edge spaced from the light-incident face; wherein the light-incident face comprises a first light-incident face confronting the LED and a second light-incident face surrounding the LED; wherein the second light-incident face is curvedly protruded towards the LED; wherein the light-emergent face comprises a second light-emergent face concaved towards the LED and a first light-emergent face protruded away from the LED, the first light-emergent face being surrounded by the second light-emergent face; and wherein the first light-emergent face comprises a flat portion at a central area thereof and a curved portion at a circumferential area thereof.