Method and system for redirecting light emitted 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 the street is beneficial. The source can be coupled to an optic that comprises a cavity. A first region of the optic can receive light from the source and emit light towards the area to be illuminated. A second region of the optic can comprise two reflective surfaces. The first reflective surface can receive light from the source and reflect the received light towards the second reflective surface. The two reflective surfaces can be used to direct light away from one side of the optic.

主权项

1. An illumination system comprising:
at least one light emitting diode (LED) light source having an optical axis extending substantially perpendicular to the at least one LED light source; and an optic that is intersected by the optical axis to provide a house side and a street side, the optic comprising: an interior surface defining a cavity that is oriented to receive light emitted by the at least one LED light source, the interior surface comprising a convex surface that is located on the house side of the optic, that protrudes into the cavity, that forms a collimating lens, and that is positioned to receive and collimate a portion of light emitted house side by the LED light source, wherein the cavity comprises a street side and a house side, with the street side of the cavity larger than the house side of the cavity; and an exterior surface opposite the interior surface, the exterior surface comprising:
a first region through which the optical axis passes;a second region that is offset from the first region, that is disposed on the house side of the optic, and that comprises a projection, wherein the projection comprises:
a first totally internally reflective surface that is oriented away from the optical axis, that is oriented to receive light from the collimating lens, and that curves upward;a second totally internally reflective surface that is substantially flat, that is oriented away from the optical axis, and that adjoins the first totally internally reflective surface;a vertical surface that is oriented towards the optical axis and that comprises an upper portion and a lower portion, the upper portion of the vertical surface adjoining the second totally internally reflective surface; anda curved surface that is oriented towards the optical axis and that extends from the lower portion of the vertical surface towards the first region of the exterior surface, wherein the first totally internally reflective surface is oriented to transfer light to the second totally internally reflective surface, and wherein the second totally internally reflective surface is oriented to reflect the transferred light through the upper portion of the vertical surface and across the optical axis.