System and method for providing a uniform backlight

• US 7,731,391 B2
• Filed: 06/06/2007
• Issued: 06/08/2010
• Est. Priority Date: 06/07/2006
• Status: Active Grant

• Current Assignee: Omron Corporation
• Original Assignee: Microscan Systems Inc (Omron Corporation)
• Inventors: Messina, Michael C., Dunn, Sheila Bergeron
• Primary Examiner(s): O'Shea; Sandra L
• Assistant Examiner(s): APENTENG, JESSICA MCMILLAN
• Application Number:
  US11/758,774
• Publication Number:
  US 20080080180A1
• Time in Patent Office: 1,098 Days
• Field of Search: 362/235, 362/311, 362/332, 362/633, 362/224, 362/225, 362/612, 362/294, 362/373
• US Class Current: 362/235
• CPC Class Codes: F21S 2/005 of modular construction
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G01N 21/8806 Specially adapted optical and illumination features
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

An illumination system includes an illumination source such as an array of LED'"'"'s over which is provided a diffuser. The illumination source provides light which, because of light refraction, radiates generally uniformly from edge to edge of the diffuser. The diffuser may be a planar flat piece of may include a hollow, cup like structure formed by a frame with a cover. The illumination system may be scaled up to provide multiple such illumination devices side by side to provide a greater area or strength of illumination. Multiple systems may utilize multiple diffusers or a single diffuser covering multiple illumination sources. The illumination source may be mounted to a backplate or heatsink which is larger than the illumination source to facilitate the addition of further electronic circuitry and or mounting capabilities.

Claims

1. A modular illumination system comprising:

two or more illumination modules, each illumination module comprising;

a heat sink,

a substrate coupled to the heat sink, the substrate having one or more light sources mounted thereon, and

a diffuser comprising a frame having a proximal end and a distal end, and a front cover attached to the distal end, wherein the proximal end of the frame is removably attached to the substrate; and

wherein the two or more illumination modules are coupled to each other along their respective edges such that the diffuser of each module abuts the diffuser of at least one adjacent module.

2. The modular illumination system of claim 1 wherein a hollow volume is formed between each substrate and its corresponding diffuser such that the one or more light sources are enclosed within the hollow volume.

3. The modular illumination system of claim 1 wherein the length and width of each frame substantially corresponds to the length and width of its corresponding substrate.

4. The modular illumination system of claim 1 wherein on at least one of the illumination modules one or both of the length and width of the substrate exceeds the corresponding length or width of the frame.

5. The modular illumination system of claim 1 wherein the diffusers of all illumination modules are removed and replaced with a single diffuser that diffuses light from all illumination modules.

6. The modular illumination system of claim 5 wherein the single diffuser is removably attached around the perimeter of the coupled illumination modules.

7. A modular illumination system comprising:

two or more illumination modules, each illumination module comprising;

a substrate having one or more light sources mounted thereon, and

a diffuser comprising a frame having a proximal end and a distal end, and a front cover attached to the distal end, wherein the proximal end of the frame is removably attached to the substrate; and

wherein the two or more illumination modules are coupled to each other along their respective edges such that the diffuser of each module abuts the diffuser of at least one adjacent module.

8. The modular illumination system of claim 7 wherein a hollow volume is formed between each substrate and its corresponding diffuser such that the one or more light sources are enclosed within the hollow volume.

9. The modular illumination system of claim 7 wherein the length and width of each frame substantially corresponds to the length and width of its corresponding substrate.

10. The modular illumination system of claim 7 wherein on at least one of the illumination modules one or both of the length and width of the substrate exceeds the corresponding length or width of the frame.

11. The modular illumination system of claim 7 wherein each illumination module further comprises a heat sink attached to the substrate.

12. The modular illumination system of claim 7 wherein the diffusers of all illumination modules are removed and replaced with a single diffuser that diffuses light from all illumination modules.

13. The modular illumination system of claim 12 wherein the single diffuser is removably attached around the perimeter of the coupled illumination modules.