Patent ID: 7731401
Filing Date: 2010-06-08
Classification: F21S,F21V,F21Y

Abstract:
1. A high efficiency automotive LED optical system comprising: a reflector having a reflective inner surface defining a cavity with an open end facing a field to be illuminated; the reflective surface including at least a parabolic reflector portion having a focal point; an LED light source array positioned to emit light into said cavity and arrayed to project light horizontally about a lamp axis directed towards the field to be illuminated; the LED light source array comprising a plurality of LEDs arrayed horizontally, the LED light source array being positioned to span the focal point; a light transmissive, refractive inner lens positioned axially and intermediate the LED light source array and the field to be illuminated; and positioned intermediate the reflector and the field to be illuminated; wherein the inner lens is positioned to intercept less than all of the light emitted by the LED light source array; wherein the reflector is positioned to intercept the remaining light emitted by the LED light source array; the inner lens with a front optical surface having a vertical cross section, and a rear optical surface having a vertical cross section such that the lens refracts light received by the rear optical surface from the LED light source array and projected from the front optical surface to within plus or minus 4 degrees of a horizontal plane through the lamp; the front optical surface having a horizontal cross section, and the rear optical surface having a horizontal cross section such that the lens refracts light received by the rear optical surface from the LED light source array and projected from the front optical surface spread horizontally from the axis; wherein the reflector directs the remaining intercepted light from the LED light source array to provide a supplementary horizontal pattern; and wherein the rear optical surface in vertical cross section includes a central section, wherein the central section includes a circular section centered on the LED light source array; and wherein the rear optical surface in vertical cross section includes a central section, wherein the central section includes a circular section centered on the LED light source array.