LED light using internal reflector

Patent metadata

Field	Value
Publication number	US-10107477-B2
Application number	US-201113294839-A
Country	US
Kind code	B2
Filing date	Nov 11, 2011
Priority date	Nov 11, 2010
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A street light includes a pole and a head attached to the pole. The head includes a light emitting element comprising a plurality of solid state light emitting devices, an optical element, and a reflector configured to reflect light emitted by the solid state light emitting devices to the optical element to produce a light distribution pattern from the head. The light emitted from the solid state emitting devices may be Lambertian patterned light. The Lambertian patterned light may be used to illuminate the reflector. The reflector may be used to transform the Lambertian patterned light to collimated light and direct the collimated light towards the optical element. The optical element may be configured to produce the light distribution pattern from the collimated light.

First claim

What is claimed is:

1. A light comprising:
a pole; and
a head attached to the pole, wherein the head comprises:
a light emitting element comprising a plurality of solid state light emitting devices arranged on a planar substrate,
an optical element continuous to the head,
a single parabolic reflector configured to reflect Lambertian patterned light emitted by the solid state light emitting devices to the optical element to produce a uniform collimated light distribution pattern from the head, and
a ceiling with at least a portion of the parabolic reflector attached to the ceiling,
wherein the light emitting element is configured to emit the light upward toward the parabolic reflector, and the light emitting element is positioned between the parabolic reflector and the optical element and at a center focus of the parabolic reflector, and
wherein the optical element is parallel to the planar substrate.

2. The light of claim 1 , wherein the head comprises an emission aperture, and wherein the optical element is positioned in the emission aperture.

3. The street light of claim 1 , wherein the head comprises an emission aperture opposite the ceiling, and wherein the optical element is positioned in the emission aperture.

4. The light of claim 1 , wherein the optical element comprises a transparent plate having a diffusing film.

5. The light of claim 1 , wherein the parabolic reflector produces collimated light.

6. The light of claim 5 , wherein the optical element is configured to produce a light distribution pattern from the collimated light.

7. The light of claim 1 , wherein the parabolic reflector is further configured to reflect the Lambertian patterned light by transforming the Lambertian patterned light to collimated light and directing the collimated light towards the optical element.

8. The light of claim 1 , wherein the light is a street light.

9. A light comprising:
a pole; and
a head attached to the pole, wherein the head comprises:
a light emitting element comprising a plurality of solid state light emitting devices supported by a substrate and configured to emit Lambertian patterned light,
an optical element,
a single concave parabolic reflector configured to transform the Lambertian patterned light to collimated light and direct the collimated light towards the optical element, and
a ceiling with at least a portion of the concave parabolic reflector is attached to the ceiling,
wherein the light emitting element is configured to emit the light upward toward the reflector, and
wherein the light emitting element is positioned between the concave parabolic reflector and the optical element and fully within the edges of the concave parabolic reflector and at least below a vertex and at a center focus of the concave parabolic reflector, the light emitting element configured to emit a uniform collimated light distribution pattern.

10. The light of claim 9 , wherein the head comprises an emission aperture, and wherein the optical element is in the emission aperture.

11. The light of claim 9 , wherein the light emitting element is positioned in the focus of the concave parabolic reflector, and wherein the concave parabolic reflector produces collimated light.

12. The light of claim 9 , wherein the optical element is configured to produce a light distribution pattern from the collimated light.

13. The light of claim 9 , wherein the light is a street light.

Assignees

• Scott Keith
• Farmer Todd
• Bridgelux Inc

Inventors

• Scott Keith
• Farmer Todd

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V7/06 Primary

  with parabolic curvature · CPC title

• F21W2131/103

  of streets or roads · CPC title

• F21S8/086

  with lighting device attached sideways of the standard, e.g. for roads and highways · CPC title