Illumination device

Patent metadata

Field	Value
Publication number	US-12007100-B2
Application number	US-202117918814-A
Country	US
Kind code	B2
Filing date	Apr 9, 2021
Priority date	Apr 14, 2020
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

An illumination device comprising an optical plate extending over a plurality of LEDs arranged on a PCB main surface of a PCB. In a mounted configuration said PCB and optical plate are mutually connected by fasteners. Each fastener extends with play in a plane parallel to said PCB main surface through a through hole in the optical plate in a direction transverse to said PCB main surface. The through hole has a wide portion extending over a depth D from a first main surface of the optical plate facing away from the PCB towards a second main surface of the optical plate facing towards the PCB, and said through hole is narrowed to a neck portion at said depth D. Furthermore, each fastener rests on a resilient washer seated in the wide portion of said through hole.

First claim

The invention claimed is:

1. An illumination device comprising an optical plate extending over a plurality of LEDs arranged on a PCB main surface of a PCB, in a mounted configuration said PCB and optical plate are mutually connected by a plurality of fasteners,
wherein each fastener extends through a respective, associated through hole in the optical plate in a direction transverse to said PCB main surface,
wherein said associated through hole has a wide portion extending over a depth D from a first main surface of the optical plate facing away from the PCB towards a second main surface of the optical plate facing towards the PCB, which through hole is narrowed to a neck portion at said depth D, and
wherein each fastener extends through said through hole with play S in a plane P parallel to said PCB main surface and rests on a respective, associated resilient washer seated in the wide portion of said associated through hole,
wherein the wide portion comprises a tapered portion which gradually, preferably continually, tapers along depth D, and
wherein the washer is a toothed washer, preferably with teeth extending outward.

2. An illumination device as claimed in claim 1 , wherein the play S is in each direction in the plane P parallel to said PCB main surface.

3. An illumination device as claimed in claim 1 , wherein the optical plate has a local thickness T at the through hole, and wherein the wide portion is a recess in the first main surface of the optical plate extending over the depth D, wherein 0.25*T<=D<=0.85*T.

4. An illumination device as claimed in claim 1 , wherein the fastener comprises an elongated portion and a head at an end thereof, said elongated portion has a diameter Df in a direction parallel to the main surface, wherein the play S in the neck portion is in the range of 0.1*Df<=S<=0.3*Df.

5. An illumination device as claimed in claim 1 , wherein teeth are at an angled position β with the normal to the base ring of the wherein β and the wide portion of the through hole has an average tapering angle α, wherein α<=β<=α+5°.

6. An illumination device as claimed in claim 1 , wherein the tapered portion has an average tapering angle α with respect to a normal to the first main surface, wherein 30°<=α<=70°.

7. All illumination device as claimed in claim 1 , wherein the washer is made of spring steel or of resilient polymer/plastic.

8. An illumination device as claimed in claim 1 , wherein the fastener is selected from the group consisting of a threaded fastener, a bolt, a screw, a snap-click, a split-pen.

9. An illumination device as claimed in claim 1 , wherein the optical plate and the PCB are maintained at a predetermined distance by the plurality of fasteners.

10. An illumination device as claimed in claim 1 , comprising spacers of a predetermined height positioned in between the optical plate and PCB at the location of the through holes and through which a respective, associated fastener of the plurality of fastener extends.

11. An illumination device as claimed in claim 1 , wherein the washer is a serrated washer.

12. An illumination device as claimed in claim 1 , wherein the washer comprises n teeth, wherein 3<=n<=24.

13. An illumination device as claimed in claim 1 , wherein the resilient washer is a star-shaped washer.

14. An illumination device as claimed in claim 1 , wherein the washer is circularly shaped and has a largest diameter Dw and the teeth have a length L, wherein 0.1*Dw<=L<=0.4*Dw.

15. An illumination device as claimed in claim 1 , wherein the tapered portion has an average tapering angle α with respect to a normal to the first main surface, wherein 40°<=α<=60°.

16. An illumination device as claimed in claim 1 , wherein the washer comprises n teeth, wherein 4<=n<=12.

Assignees

• Signify Holding Bv

Inventors

• Hameau Romain

Classifications

• F21V17/164

  the parts being subjected to bending, e.g. snap joints · CPC title

• F21V17/12 Primary

  by screwing · CPC title

• F21V5/007

  Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane (combination of two or more refractors F21V5/008) · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21Y2105/10

  comprising a two-dimensional [2D] array of point-like light-generating elements · CPC title