LED device for wide beam generation

摘要

An apparatus and method is characterized by providing an optical transfer function between a predetermined illuminated surface pattern, such as a street light pattern, and a predetermined energy distribution pattern of a light source, such as that from an LED. A lens is formed having a shape defined by the optical transfer function. The optical transfer function is derived by generating an energy distribution pattern using the predetermined energy distribution pattern of the light source. Then the projection of the energy distribution pattern onto the illuminated surface is generated. The projection is then compared to the predetermined illuminated surface pattern to determine if it acceptably matches. The process continues reiteratively until an acceptable match is achieved. Alternatively, the lens shape is numerically or analytically determined by a functional relationship between the shape and the predetermined illuminated surface pattern and predetermined energy distribution pattern of a light source as inputs.

主权项

1. A light module comprising:
a substrate; and a plurality of light sources disposed along the substrate, each light source comprising:
a respective lens; andone or more respective light emitting diodes disposed adjacent the respective lens and having an axis projecting substantially perpendicularly away from the substrate and through the respective lens,wherein the axis lies in a plane, andwherein a portion of the respective lens disposed on a first side of the plane forms a prism that is laterally offset from the axis by a gap and that is operative to receive light from the one or more respective light emitting diodes and to direct the received light through the plane by reflection.