Light fixture with wide-angle light distribution

• US 9,657,918 B2
• Filed: 03/04/2013
• Issued: 05/23/2017
• Est. Priority Date: 05/23/2008
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Castillo, Mario Alberto, Wilcox, Kurt S.
• Primary Examiner(s): PAYNE, SHARON E
• Application Number:
  US13/784,204
• Publication Number:
  US 20140078747A1
• Time in Patent Office: 1,541 Days
• Field of Search: 362327, 362147, 362148, 362236, 36231106, 3623111, 362335, 3621531, 36231102
• CPC Class Codes: F21S 8/02 of recess-mounted type, e.g. downlighters specially adapted for vehicle exteriors F21S41/00-F21S45/00
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 5/08 producing an asymmetric light distribution
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00

Abstract

A lighting fixture includes a front end-portion having an edge defining a light opening and a back end-portion spaced from the opening which has a centerline. At least one LED emitter on the mounting board disposed at the back end-portion for directing light toward the opening, the emitter(s) being off-centerline in a first lateral direction. A lens for the emitter(s), the lens being configured for distribution of light from the emitter(s) primarily in a second lateral direction which is opposite the first lateral direction such that the light passes through the light opening at a portion of the edge that is off-centerline in the second lateral direction, thereby to widen the illumination angle from the fixture.

Claims

1. A lighting fixture comprising:

a support member bordering a light-passage space and including front and back end portions, the front end-portion having an edge defining a light opening which has a centerline, the back end-portion being spaced from the light opening;

a substantially planar board disposed at the back-end portion transverse the support member and bordering the light-passage space extending from the board to the light opening;

at least one LED emitter positioned on the board off-centerline in a first lateral direction for directing light toward the light opening; and

a lens for the at least one emitter, the lens being configured for directing light from the emitter(s) primarily in a second lateral direction which is opposite the first lateral direction such that the light passes across the light-passage space and through the light opening at a portion of the edge that is off-centerline in the second lateral direction with no more than minimal light being directed onto the support member.

2. The lighting fixture of claim 1 wherein each lens is a separate piece over the associated emitter.

3. The lighting fixture of claim 1 wherein:

the board has a peripheral region surrounding a non-peripheral region; and

at least one other emitter on the non-peripheral region and having the associated lens configured for distribution of light therefrom along an emitter axis with no more than minimal light directed onto the support member.

4. The lighting fixture of claim 3 wherein the peripheral region has an annular shape concentric with the opening.

5. The lighting fixture of claim 1 wherein the mounting board is substantially parallel to a light-opening plane.

6. The lighting fixture of claim 1 wherein each lens for directing light in a preferential-side toward the second lateral direction includes:

an emitter-adjacent base end forming an opening;

an inner surface extending from the base end with (a) a surrounding lateral surface formed about an emitter axis and (b) an end surface configured to direct light toward the preferential side, the inner surface forming a void;

an output-end surface configured to direct light toward the preferential side; and

an outer lateral surface configured for TIR to direct light toward the output-end surface, whereby light from the emitter exits the output-end surface predominantly toward the preferential side.

7. The lighting fixture of claim 6 wherein the surrounding lateral surface is substantially cylindrical.

8. The lighting fixture of claim 7 wherein the substantially cylindrical lateral surface has a right cylindrical shape of substantially circular cross-section.

9. The lighting fixture of claim 6 wherein the inner end surface has a substantially planar portion angled toward the preferential side and transitioning from near the emitter axis to a convex portion that is on a non-preferential side and meets the surrounding lateral surface at a position farthest from the base end.

10. The lighting fixture of claim 9 wherein the outer lateral surface extends from the base end to terminate proximal to the output-end surface at distances from the emitter axis which are greatest on the preferential side and gradually decrease toward a non-preferential side.

11. The lighting fixture of claim 10 wherein the outer lateral surface has angles of divergence with respect to the emitter axis which are the greatest on the preferential side and gradually decrease toward the non-preferential side.

12. The lighting fixture of claim 6 wherein the output-end surface is substantially planar.

13. The lighting fixture of claim 12 wherein the emitter-adjacent base end is a planar surface which is substantially perpendicular to an emitter axis.

14. The lighting fixture of claim 13 wherein the output-end surface is angled toward a non-preferential side, with the edge of such output-end surface on the preferential side being farthest from the plane of the base end.

15. The lighting fixture of claim 6 wherein the lens further includes an outward flange about the outer lateral surface.

16. The lighting fixture of claim 15 wherein the outward flange includes a reference mark indicating an orientation of the preferential side during installation of the lens over the emitter.