Patent ID: 9335024
Filing Date: 2016-05-10
CPC Classification: F21V,F21Y

Claim Text:
1. A lens configured for divergently refracting light from an LED (light emitting diode) light source comprising: a light incident face configured for receiving the light from the LED light source; a light exit face opposite to the light incident face, configured for directing the light from the LED light source away from the lens; and a plurality of annular stepwise portions formed on the light exit face; wherein the plurality of the stepwise portions are formed at or near a periphery of the light exit face, each stepwise portion comprises an annular flat surface, and a plurality of micro patterns are arranged on the flat surface of at least one of the stepwise portions to scatter light exiting from the periphery of the light exit face; wherein the light incident face is a concave face and radially symmetrical relative to an optical axis of the lens, and the light exit face is a convex face and radially symmetrical relative to the optical axis of the lens; and wherein each stepwise portion further comprises a first cylindrical wall extending downwardly from an outer periphery of the annular flat surface thereof, and a second cylindrical wall extending upwardly from an inner periphery of the annular flat surface thereof.