Sealed LED light fixture including dual layer glass sheet

• US 7,798,672 B2
• Filed: 01/17/2006
• Issued: 09/21/2010
• Est. Priority Date: 01/24/2005
• Status: Active Grant

• Current Assignee: Dialight Europe Limited (Dialight PLC)
• Original Assignee: Dialight Lumidrives Limited
• Inventors: Routledge, Gordon
• Primary Examiner(s): Negron; Ismael
• Application Number:
  US11/795,927
• Publication Number:
  US 20080212316A1
• Time in Patent Office: 1,708 Days
• Field of Search: 362/249.02, 362/240, 362/236, 362/362, 362/225, 362/545, 362/544, 362/800, 362/311.02, 362/311.05
• US Class Current: 362/249.02
• CPC Class Codes: F21S 8/022 intended to be recessed in a floor or like ground surface, e.g. pavement or false floor
• CPC Class Codes: F21V 15/005 Measures against vandalism, stealing or tampering F21V15/02, F21V15/04 take precedence
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 19/04 with provision for changing light source, e.g. turret auxiliary devices for cleaning, placing, or removing incandescent lamps H01K3/32, fluorescent lamps H01J9/006
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 31/00 Gas-tight or water-tight arrangements
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21V 9/04 for filtering out infrared radiation dichroic reflectors F21V7/22; using liquid-filled chambers F21V9/12
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• CPC Class Codes: F21W 2131/10 Outdoor lighting
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An illumination apparatus includes a lamp housing defining a cavity, a plurality of light emitting diodes disposed within the cavity, a first inner glass sheet for sealing the cavity, a second outer glass sheet, and a resilient layer formed between the glass sheets.

Claims

1. Apparatus for providing illumination, comprising:

a lamp housing defining a cavity;

a plurality of light emitting diodes (LED'"'"'s) disposed within said cavity; and

sealing means, comprising a first glass sheet, for sealing the cavity;

said sealing means further comprising an outer glass sheet and a resilient layer located between said first glass sheet and said outer glass sheet.

2. The apparatus as claimed in claim 1 wherein said apparatus comprises a light fixture.

3. The apparatus as claimed in claim 1 wherein said LED'"'"'s are high power LED'"'"'s.

4. The apparatus as claimed in claim 1 wherein at least an upper region of said LED'"'"'s are surrounded by air.

5. The apparatus as claimed in claim 1 wherein at least an upper region of said LED'"'"'s are surrounded by an inert gas.

6. The apparatus as claimed in claim 1 wherein said resilient layer is a resin layer.

7. The apparatus as claimed in claim 6 wherein said resin layer comprises a UV filter.

8. The apparatus as claimed in claim 1 wherein said cavity comprises:

a first cavity portion having a first cross section and a second cavity portion located above said first cavity portion and having a cross section greater than said first cavity portion.

9. The apparatus as claimed in claim 8 wherein said first glass sheet has a cross section greater than said first cross section and is located to cover an open mouth portion of said first cavity portion.

10. The apparatus as claimed in claim 9 wherein said first glass sheet has a cross section less than a cross section of said second cavity portion.

11. The apparatus as claimed in claim 1 wherein said lamp housing comprises:

a base portion having a peripheral edge region extending around the whole outer edge of the base portion;

an upright wall portion extending upwardly from said peripheral edge region;

wherein

an internal surface of said wall portion is stepped, a lower surface of said wall having a smaller internal cross section than an upper internal cross section.

12. The apparatus as claimed in claim 11 wherein said wall portion has an upper rim defining an open mouth of said housing.

13. The apparatus as claimed in claim 11 further comprising an internal groove extending along a region of the inner surface of said wall portion.

14. The apparatus as claimed in claim 13 wherein a portion of said resilient layer is held in said groove to prevent movement of said sealing means away from said lamp housing.

15. A method for providing a light fixture, comprising the steps of:

providing a lamp housing defining a cavity;

mounting a plurality of LED'"'"'s at a bottom surface of said housing in said cavity; and

sealing said cavity via at least one glass sheet;

wherein the step of sealing comprises;

covering a lower cavity region of said cavity with a first glass sheet;

subsequent to said step of covering said lower cavity region, depositing a resilient material over said first glass sheet;

locating a second glass sheet on a resilient layer generated by said step of depositing resilient material.

16. The method as claimed in claim 15 further comprising the steps of:

depositing further resilient material around an outer edge region of said outer glass sheet.

17. The method as claimed in claim 15 wherein said step of sealing said cavity comprises irreversibly sealing said cavity.