LIGHTING MODULE WITH DIFFRACTIVE OPTICAL ELEMENT

• US 20110149565A1
• Filed: 12/17/2009
• Published: 06/23/2011
• Est. Priority Date: 12/17/2009
• Status: Active Grant

• Current Assignee: Phoseon Technology, Inc.
• Original Assignee: Phoseon Technology, Inc.
• Inventors: MARSON, JONATHAN L.
• Granted Patent: US 8,465,172 B2
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: G02B 19/0009 having refractive surfaces only
• CPC Class Codes: G02B 19/0014 at least one surface having optical power
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02B 19/0095 for use with ultraviolet radiation

Abstract

A lighting module having an array of light-emitting elements on a substrate, at least one diffractive optical element arranged to receive light from the light-emitting elements and partially collimate the light. A method of packaging a lighting module including mounting at least one array of light-emitting elements on a substrate in a package, and enclosing the package with a window, the window has a diffractive optical element on a surface of the window closest to the array, the diffractive optical element arranged to partially collimate the light. A lighting module having an array of light-emitting elements on a substrate, at least one diffractive optical element arranged to receive light from the light-emitting elements and scatter the light into a random emission pattern to produce a uniform irradiance at a target surface.

Claims

14. A method of packaging a lighting module, comprising:

mounting at least one array of light-emitting elements on a substrate in a package; and

enclosing the package with a window, the window having an array of diffractive optical elements on a surface of the window closest to the light-emitting element array, the array of diffractive optical elements arranged to partially collimate the light.

15. The method of claim 14, wherein the diffractive optical elements are holographic optical elements.

16. The method of claim 14, wherein the window has a pre-existing diffractive optical elements on the surface.

17. The method of claim 14, further comprising:

dispensing a gel over the array of light-emitting elements; and

mounting a transparent substrate on the gel, the transparent substrate having a second diffractive optical element on a surface.

18. The method of claim 17, wherein the second diffractive optical element comprises an array of diffractive optical elements.

19. The method of claim 14, further comprising arranging a lens adjacent to each light-emitting element inside the package.

20. The method of claim 14, further comprising arranging the window such that a gap exists between the array and the window.

21. The method of claim 20, further comprising allowing the gap to fill with air.

22. The method of claim 20, further comprising filling the gap with a gel material.

23. The method of claim 22, further comprising filling the gap with a gel material that is index matched to at least one of the window and the light emitting elements

24. A lighting module, comprising:

an array of light-emitting elements on a substrate;

at least one diffractive optical element arranged to receive light from the light-emitting elements and scatter the light into a random emission pattern to produce a uniform irradiance at a target surface.

1. A lighting module, comprising:

an array of light-emitting elements on a substrate;

at least one diffractive optical element arranged to receive light from the light-emitting elements and partially collimate the light.

2. The lighting module of claim 1, wherein the module is contained within a package having a window with two surfaces, one surface having the diffractive optical element.

3. The lighting module of claim 1, wherein a second diffractive optical element is arranged to scatter light into a random emission pattern to produce a uniform irradiance at a target work surface.

4. The lighting module of claim 1, wherein the diffractive optical element comprises a holographic optical element.

5. The lighting module of claim 1, wherein the diffractive optical element has a focal point in a first axis.

6. The lighting module of claim 2, wherein the second diffractive optical element has a focal point in a first axis.

7. The lighting module of claim 5, wherein the diffractive optical element partially collimates the light in a second axis

8. The lighting module of claim 1, further comprising a lens element arranged adjacent to each light emitting element to capture the light from the element.

9. The lighting module of claim 1, wherein the diffractive optical element comprises an array of diffractive optical elements, each diffractive optical element corresponding to a light-emitting element.

10. The lighting module of claim 8, wherein a gap exists between the lens element and the window.

11. The lighting module of claim 1, wherein a gap exists between the array and the diffractive optical element.

12. The lighting module of claim 10, wherein the gap is filled with one of either air or a gel material.

13. The lighting module of claim 12, wherein the gel material comprises a material that is index matched to at least one of the window or the light-emitting elements.

25. The lighting module of claim 24, wherein the module is contained within a package having a window comprising two surfaces, at least one surface having the diffractive optical element mounted thereon.

27. The lighting module of claim 24, wherein the diffractive optical element comprises a holographic optical element.

28. The lighting module of claim 24, wherein the uniform irradiance at the target surface has less than thirty percent divergence over a designated area.

25-1. The lighting module of claim 24, wherein a second diffractive optical element is arranged to scatter light into a random emission pattern to produce a uniform irradiance at a target work surface.