Lens and light emitting diode using the lens to achieve homogeneous illumination

摘要

A lens (23) and an LED using the lens to achieve homogeneous illumination include a region. The region around the optical axis of a lens is designed to be concave and form a divergent surface (25). The upper surface of the lens is a continuous curved surface (26) to diverge the high-intensity light emitted by the LED in the vicinity of the optical axis (24) through refractions. Therefore, the LED can homogeneously illuminate a larger area.