Patent ID: 7347590
Filing Date: 2008-03-25
Classification: G02B

Abstract:
1. A lens used for a light-emitting diode (LED), comprising a body containing a central axis and symmetrical about the central axis, the lens being mounted onto the LED, the lens further comprising: a first lens part with a light guide housing, the light guide housing including a first light guide surface and a second light guide surface, the first light guide surface being a concave surface facing upward for focusing light rays from the LED, the second light guide surface refracting the light rays from the LED, the first lens part totally reflecting light rays from the second light guide surface so that most light rays emitted from the first lens part are parallel to the central axis; and a second lens part opposite to the first lens part, for totally reflecting the light rays from the first lens part and entered into the second lens part, so that light emitted from the second lens part are approximately perpendicular to the central axis.