LIGHTING DEVICE

• US 20090244902A1
• Filed: 06/11/2009
• Published: 10/01/2009
• Est. Priority Date: 12/22/2006
• Status: Active Grant

• Current Assignee: Morton Graham
• Original Assignee: Morton Graham
• Inventors: Graham, Morton
• Granted Patent: US 7,819,567 B2
• Time in Patent Office: Days
• US Class Current: 362/294
• CPC Class Codes: A47F 3/001 Devices for lighting, humidifying, heating, ventilation
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21W 2131/305 for refrigerators
• CPC Class Codes: F21W 2131/405 for shop-windows or displays
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F25D 27/00 Lighting arrangements in general F21
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes

Abstract

A lighting device comprising a transparent acrylic or glass rod (10) with a series of bores (11) drilled in parallel through a part of the rod and spaced apart along its length, each bore (11) containing a pair of LEDs (12) such that the light emitted therefrom is diffused along the length of the rod, and a reflective strip (17) disposed along the rod to reflect a beam of light outwardly from the rod (10) in a direction parallel to the axes of the bores (11) to provide illumination for display purposes or ambient light.

Claims

1. A lighting device comprising a translucent or transparent body, of a material which will sustain total internal reflection of light, at least one electrically powered light source disposed within the body, such that light emitted therefrom is substantially totally internally reflected therein, and a reflector to reflect light from the body.

2. The lighting device according to claim 1, wherein the body is of cylindrical form with at least one bore extending into the body in a generally radial direction or transverse direction, the light source being located in the bore such that light emitted therefrom is directed into the body generally normal to the axis of the bore.

3. The lighting device according to claim 2, wherein the light emitted from the or each light source is directed parallel to a central longitudinal axis of the body.

4. The lighting device according to claim 1, wherein the reflector is a diffusely reflective strip extending along the body at or near the surface thereof.

5. The lighting device according to claim 2, wherein the reflector is positioned such as to reflect light from the body in a direction parallel to the or each bore.

6. The lighting device according to claim 1, wherein the body is a solid transparent rod.

7. The lighting device according to claim 1, wherein the body is of an acrylic material.

8. The lighting device according to claim 1, wherein the or each light source is a light emitting diode (LED).

9. The lighting device according to claim 2, wherein two or more radial bores are provided and spaced apart along the length of the body, each bore housing a pair of LEDs disposed back to back.

10. The lighting device according to claim 2, wherein the or each bore is of circular cross-section and formed by radial drilling of the body.

11. The lighting device according to claim 2, wherein the reflector is a strip extending along the body and having a width greater than the diameter of the or each bore.

12. The lighting device according to claim 7, wherein the or each LED is mounted on a circuit board which itself is mounted on a metallic heat sink.

13. The lighting device according to claim 2, wherein the or each bore extends only part way through the body, the closed end of each bore having a reflective surface.

14. The lighting device according to claim 2, wherein the or each bore is filled with an index matching liquid or resin to aid thermal conduction away from the light source and enhance light coupling into the body.

15. The lighting device according to claim 1, wherein the body is formed by casting with the or each light source embedded within the material of the body.

16. The lighting device according to claim 1, wherein the body is formed from lengths of transparent rod joined end to end, each length containing one or more light sources.

17. The lighting device according to claim 1, wherein the body is formed from a length of solid transparent rod bent to form an annulus, the ends of the rod being bonded together.

18. The lighting device according to claims 1, wherein the body is formed or cast in annular configuration.

19. The lighting device according to claim 1, wherein the reflector is separate from the body.