Shade and wavelength converter for solid state luminaires

Patent metadata

Field	Value
Publication number	US-10544917-B2
Application number	US-201715681927-A
Country	US
Kind code	B2
Filing date	Aug 21, 2017
Priority date	Aug 24, 2016
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

Shades and/or reflectors for luminaires. The luminaires may be retrofitted with the shades and/or reflectors to selectively control the direction and/or spectrum of light emitted by the luminaires. In particular, the efficiency and/or color contrast of a luminaire may be improved by using wavelength shifting material, such as a phosphor, to absorb less desired wavelengths and transmit more desired wavelengths. The shade may provide a transmissive filter which reflects desired wavelengths such as red and green, while passing less desired wavelengths (e.g., blue) toward the wavelength shifting material which emits such as light of more desirable wavelengths.

First claim

The invention claimed is:

1. A shade assembly to control an illumination pattern of a luminaire, the shade assembly comprising:
a primary shade comprising a sheet of material having inner and outer arcuate edges concentric about a central axis, the inner and outer arcuate edges extending between first and second ends of the sheet, the sheet bendable by a user to overlap portions of the sheet adjacent the first and second ends to form the sheet into the shape of a truncated cone with at least a portion of the inner edge fitting around a neck portion of the luminaire disposed at least one of above or below at least one light source of the luminaire, the sheet of material comprises at least one reflective surface;
a fastener which selectively maintains the sheet in the shape of the truncated cone around the neck portion of the luminaire; and
a secondary shade that is selectively attachable to the primary shade.

2. The shade assembly of claim 1 wherein the sheet of material of the primary shade comprises a sheet of microcellular formed polyethylene terephthalate (MCPET).

3. The shade assembly of claim 1 wherein the secondary shade comprises a sheet of material which, when attached to the shade, extends from at least a portion of the outer arcuate edge of the primary shade toward the at least one light source of the luminaire.

4. The shade assembly of claim 3 wherein the secondary shade extends from at least 25 percent of the outer arcuate edge of the primary shade.

5. The shade assembly of claim 3 wherein the secondary shade extends from at least 50 percent of the outer arcuate edge of the primary shade.

6. The shade assembly of claim 1 wherein the secondary shade is at least one of optically transparent or optically translucent.

7. The shade assembly of claim 6 wherein the secondary shade is formed of or coated with an optical filter material which transmits light incident on the secondary shade having a wavelength in a first set of wavelengths and one of reflects or absorbs light incident on the secondary shade having a wavelength in a second set of wavelengths.

8. The shade assembly of claim 7 wherein the secondary shade is formed of or coated with an optical filter material which one of reflects or absorbs light incident on the secondary shade having a wavelength below 480 nanometers.

9. The shade assembly of claim 7 wherein at least one surface of the secondary shade includes a dielectric coating disposed thereon.

10. The shade assembly of claim 1 wherein the secondary shade comprises a wavelength shifter portion which receives light from the at least one light source of the luminaire on a first surface of the secondary shade and in response emits light at a shifted wavelength on a second surface of the secondary shade, the second surface of the secondary shade opposite the first surface of the secondary shade.

11. The shade assembly of claim 10 wherein the wavelength shifter portion of the secondary shade emits light at wavelengths above 480 nanometers.

12. The shade assembly of claim 10 wherein the wavelength shifter portion of the secondary shade comprises the sheet loaded with phosphor.

13. The shade assembly of claim 10 wherein the wavelength shifter portion of the secondary shade comprises the secondary shade loaded with a europium doped strontium-barium silicate phosphor.

14. The shade assembly of claim 10 wherein the wavelength shifter portion of the secondary shade comprises a coating of quantum dots disposed on at least one surface of the secondary shade.

15. The shade assembly of claim 1 wherein at least one surface of the secondary shade comprises a reflective surface.

16. The shade assembly of claim 1 wherein the secondary shade comprises a sheet of microcellular formed polyethylene terephthalate (MCPET).

Assignees

• Express Imaging Systems Llc

Inventors

• Renn John O
• Robinson Clare Joyce
• Reed William G

Classifications

• F21V1/08 Primary

  adjustable · CPC title

• F21V1/22

  the material being plastics · CPC title

• F21V1/12

  Composite shades {, i.e. shades being made of distinct parts} · CPC title

• F21V1/17 Primary

  the material comprising photoluminescent substances · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title