Patent ID: 8231248
Filing Date: 2012-07-31
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, 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; and wherein the light-reflecting face comprises a first light-reflecting face and a second light-reflecting face having a curvature different from that of the first light-reflecting face; wherein a flange is protruded outwardly between the first light-reflecting face and the second light-reflecting face; and wherein the light-emergent face comprises a first light-emergent face and a second light-emergent face surrounding the first light-emergent face, the first light-emergent face comprising a flat top face, the flat top face of the first light-emergent face being located higher than the flange and lower than a joint of the second light-reflecting face and the second light emergent face.