LED devices for offset wide beam generation

• US 9,297,517 B2
• Filed: 06/03/2013
• Issued: 03/29/2016
• Est. Priority Date: 08/14/2008
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Cooper Technologies Company (Eaton Corporation PLC.)
• Inventors: Holder, Ronald G., Rhoads, Greg
• Primary Examiner(s): HAN, JASON
• Application Number:
  US13/908,663
• Publication Number:
  US 20130258665A1
• Time in Patent Office: 1,030 Days
• Field of Search: 362/240, 362/245, 362/249.02, 362/311.02, 362327-329
• US Class Current: 1/1
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21K 9/90 Methods of manufacture
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 17/101 permanently, e.g. welding, gluing or riveting
• CPC Class Codes: F21V 17/164 the parts being subjected to bending, e.g. snap joints
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: F21V 7/0066 specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified F21V7/16 - F21V7/30 take precedence
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A light source is combined with an optic and a reflector. Light incident onto to the reflector is reflected with a single reflection. The reflector occupies a portion of a solid angle around the light source to the exclusion of the optic at least with respect to any optical function. The reflector directly receives a second portion of light. The optic occupies substantially all of the remaining portion of the predetermined solid angle to directly receive a first portion of light from the light source. A reflected beam from the reflector is reflected into a predetermined reflection pattern. The inner and/or outer surface of the optic is shaped to refract or direct light which is directly transmitted into the optic from the light source from a first portion of light and/or reflected into the optic from the reflector from the reflected beam into a predetermined beam.

Claims

1. A luminaire comprising:

a housing comprising an area that is operative to emit light towards an area to be illuminated; and

a plurality of arrays of light sources, each array mounted to a respective substrate, the substrates mounted adjacent one another at the area of the housing,

wherein each light source comprises;

at least one light emitting diode;

an optic covering the at least one light emitting diode and comprising;

a base that extends peripherally with respect to the at least one light emitting diode and that is flat in a first dimension and in a second dimension, the first and second dimensions perpendicular to one another; and

an environmentally exposed exterior surface that protects the at least one light emitting diode from environmental exposure and that has a debris shedding smooth shape, the debris shedding smooth shape adjoining the base, extending peripherally about the at least one light emitting diode, and extending fully over the at least one light emitting diode in the first dimension and in the second dimension to cover the at least one diode fully, wherein the debris shedding smooth shape is free from projections and abrupt changes in form to provide a smooth surface resistant to accumulation or collection of dust, dirt, debris, or optically occluding material from an environment; and

a mirror disposed between the environmentally exposed exterior surface and the at least one light emitting diode.

2. The luminaire of claim 1, wherein each array is individually weatherproofed.

3. The luminaire of claim 1, wherein fins that are operative to dissipate heat are attached to the housing,

wherein the fins are disposed behind the plurality of arrays and project in a first direction, and

wherein the arrays of light sources emit light in a second direction that is substantially opposite the first direction.

4. The luminaire of claim 1, wherein the luminaire comprises a street light.

5. The luminaire of claim 1, wherein the at least one light emitting diode is disposed at least partially in a cavity of the optic, and

wherein the mirror is disposed in the cavity.

6. The luminaire of claim 1, wherein the optic comprises a cavity that is oriented to receive light rays from the at least one light emitting diode, and

wherein substantially all of the light rays that are incident on the mirror are subsequently incident on a surface of the cavity.

7. The luminaire of claim 1, wherein the optic comprises a cavity that is oriented to receive light rays from the at least one light emitting diode, and

wherein the mirror is oriented to reflect across the cavity substantially all of said light rays that are incident on the mirror.

8. The luminaire of claim 1, wherein the at least one light emitting diode comprises an axis, a portion of the axis disposed between the at least one light emitting diode and the exterior surface, and

wherein the mirror is operative to form a beam that crosses the portion of the axis.

9. The luminaire of claim 1, wherein the environmentally exposed exterior surface that protects the at least one light emitting diode from environmental exposure and that has a debris shedding smooth shape is convex.

10. The luminaire of claim 1, wherein the debris shedding smooth shape is convex.

11. The luminaire of claim 1, wherein the debris shedding smooth shape is substantially hemispherical.

12. A luminaire comprising:

a housing comprising an area that is operative to emit light towards an area to be illuminated; and

a plurality of arrays of light sources, each array mounted to a respective substrate, the substrates mounted adjacent one another at the area of the housing,

wherein each light source comprises;

at least one light emitting diode;

an optic comprising;

a cavity oriented to receive light from the at least one light emitting diode;

a base that extends peripherally about the cavity and that comprises a first base portion, and second base portion, a third base portion, and fourth base portion,

wherein the first base portion and the second base portion are disposed on opposing sides of the cavity along a first reference line, and

wherein the third base portion and the fourth base portions are disposed on other opposing sides of the cavity along a second reference line that is perpendicular to the first reference line; and

a refractive outer surface that is opposite the cavity, that is operative to emit the received light, that is configured for exposure to an outdoor environment, and that covers the at least one light emitting diode with a debris shedding smooth shape that is free from projections,

wherein the debris shedding smooth shape extends from the first base portion to the second base portion,

wherein the debris shedding smooth shape extends from the third base portion to the fourth base portion, and

wherein the debris shedding smooth shape is smooth to resist accumulation or collection of dust, dirt, debris, or optically occluding material from the outdoor environment; and

a reflector disposed in the cavity and oriented to direct onto a surface of the cavity substantially all rays emitted from the at least one light emitting diode that are incident on the reflector.

13. The luminaire of claim 12, wherein the reflector is operative to form from the incident rays a beam that transmits across an axis of the at least one light emitting diode prior to emission from the optic.

14. The luminaire of claim 12, wherein the at least one light emitting diode is intersected by a reference plane that is substantially perpendicular to the substrate associated therewith,

wherein the reflector is disposed on a first side of the reference plane, and

wherein the reflector is operative to form a beam that passes through a region of the refractive outer surface that is disposed on a second side of the reference plane.

15. The luminaire of claim 12, wherein the at least one light emitting diode is intersected by a reference plane that is substantially perpendicular to one of the substrates;

wherein the reflector is disposed on a first side of the reference plane, and

wherein the reflector is operative to form a beam that is incident on a portion of the surface that is disposed on a second side of the reference plane.

16. The luminaire of claim 12, wherein the housing comprises fins extending from the area that are operative to dissipate heat generated by operating the plurality of arrays of light sources.

17. The luminaire of claim 12, wherein the at least one light emitting diode comprises at least one light emitting diode package.

18. The luminaire of claim 12, wherein the at least one light emitting diode has an axis, and

wherein the reflector is operative to direct said incident rays across a portion of the axis that is inside the cavity.

19. The luminaire of claim 12, wherein the debris shedding smooth shape is substantially hemispherical.