Method and system for managing light from a light emitting diode

摘要

A light source, for example a light emitting diode, can emit light and have an associated optical axis. The source can be deployed in applications where it is desirable to have illumination biased laterally relative to the optical axis, such as in a street luminaire where directing light towards a street is beneficial. The source can be coupled to an optic that comprises an inner surface facing the source and an outer surface that is opposite the inner surface. The inner surface can comprise a refractive surface that receives light headed away from the optical axis of the light source, for example opposite the street. The refractive surface can form the received light into a beam. The outer surface of the optic can reflect the beam back across the optical axis, for example so that light headed away from the street is redirected towards the street.

主权项

1. An illumination system comprising:
an optic comprising a first surface that defines a cavity and a second surface opposite the first surface; and a light emitting diode disposed at least partially in the cavity, the light emitting diode having a first optical axis, wherein a cross section of the optic taken at the optical axis of the light emitting diode shows asymmetry of the first surface with respect to the optical axis and asymmetry of the second surface with respect to the optical axis, and the cross section includes:
the second surface having a first and second portion both substantially located on a first side of the optical axis, wherein the first portion is a total internally reflective (TIR) surface and the second portion is a refractive surface, andwherein the first surface of the optic includes a convex focusing element that is substantially located on the first side of the optical axis, wherein a portion of light emitted by the light emitting diode on the first side of the optical axis is focused by the focusing element outward with respect to the optical axis and toward the TIR surface, wherein the TIR surface reflects the focused light toward the refractive surface that refracts the reflected light across the optical axis to a second side of the optical axis, so that the illumination system produces an overall illumination pattern that is biased to the second side of the axis.