| 摘要 |
A lens for uniform illumination for a light source includes a light guide body and a reflector. The light guide body includes a side surface, an incident surface and an emitting surface opposite to the incident surface, a trough next to the incident surface having a first wall, and a tapered space next to the emitting surface having a second wall. When the light source emits light, the light is refracted from a first wall of the trough to a second wall of the tapered space. The light is totally reflected by the second wall, travels to the side surface, and is reflected by the reflector over the second wall, then refracted at the second wall to pass through the light guide body. Therefore, the light from the light source is spread out effectively and the luminous efficiency of the light source is enhanced.
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