Illumination device, light source, and light module

• US 8,764,228 B2
• Filed: 03/02/2012
• Issued: 07/01/2014
• Est. Priority Date: 11/08/2011
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lo, Hsin-Hsiang, Lin, Chun-Chuan, Tiao, Kuo-Tung, Hu, Hung-Lieh, Chen, Chen-Kun, Li, Chao-We
• Primary Examiner(s): Guharay, Karabi
• Assistant Examiner(s): LEE, NATHANIEL J.
• Application Number:
  US13/410,310
• Publication Number:
  US 20130114252A1
• Time in Patent Office: 851 Days
• Field of Search: 362235-248, 362615-619, 362/627, 313110-117
• US Class Current: 362/235
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 11/14 with many small apertures
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/20 on convex supports or substrates, e.g. on the outer surface of spheres
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An illumination device including a base, a light bar, and a cover is provided. The base has a cavity. The light bar is disposed at the bottom of the cavity and includes a plurality of dot light sources arranged along a first axial direction. The cover is assembled to the base for correspondingly covering the light bar and has a plurality of openings. The distribution density of the openings increases from a corresponding location of a dot light source towards two opposite ends along the first axial direction. A light source and a light module are also provided. Another illumination device including a base and a plurality of light sources is further provided.

Claims

1. An illumination device comprising:

a base having a cavity;

a light bar disposing at the bottom of the cavity, wherein the light bar comprises a plurality of dot light sources arranged along a first axial direction; and

a cover assembling to the base for correspondingly covering the light bar, wherein the cover has a plurality of openings, and the distribution density of the openings increases from a corresponding location of a dot light source towards two opposite ends along the first axial direction.

2. The illumination device as claimed in claim 1, wherein some of the openings directly opposite the dot light sources.

3. The illumination device as claimed in claim 1, wherein the distribution density of the openings are fixed along a second axial direction, and the first axial direction is substantially perpendicular to the second axial direction.

4. The illumination device as claimed in claim 1,

p_i=(i/1)^gamma×

(h/2)|<sub>i=0˜

1</sub>,

wherein i is the normalized variable of the openings'"'"' arrangement number along the first axial direction, h is the spacing value of the dot light source, gamma is the locational modulation coefficient, and p_i is the location of each corresponding opening and dot light source.

5. The illumination device as claimed in claim 1, wherein the cover is made of reflective diffusion material.

6. The illumination device as claimed in claim 1, wherein an interior wall of the base contains reflective diffusion material layer.

7. The illumination device as claimed in claim 1, wherein the cavity is strip-shaped or plate-shaped.

8. The illumination device as claimed in claim 7, wherein the openings have the same size.

9. The illumination device as claimed in claim 7, wherein the cavity is curved strip-shaped or curved plate-shaped, and the cover maintains a fixed distance relative to the bottom of the cavity.

10. The illumination device as claimed in claim 9, wherein the base and the cover have flexibility.

11. A light source comprising:

a light bar comprises a plurality of dot light sources of a first axial direction; and

a cover covering the light bar, wherein the cover has a plurality of openings, and the distribution density of the openings increases from a corresponding location of a dot light source towards two opposite ends along the first axial direction.

12. The light source as claimed in claim 11, wherein parts of the openings directly opposite the dot light sources.

13. The light source as claimed in claim 11, wherein the distribution density of the openings are fixed along a second axial direction, and the first axial direction is substantially perpendicular to the second axial direction.

14. The light source as claimed in claim 11,

p_i=(i/1)^gamma×

(h/2)|<sub>i=0˜

1</sub>,

wherein i is the normalized variable of the openings'"'"' arrangement number along the first axial direction, h is the spacing value of the dot light source, gamma is the locational modulation coefficient, and p_i is the location of each corresponding opening and dot light source.

15. The light source as claimed in claim 11, wherein the cover is made of reflective diffusion material.

16. The light source as claimed in claim 11, wherein the cover is strip-shaped, and each of the dot light sources maintains a fixed distance relative to the cover.

17. The light source as claimed in claim 16, wherein the openings have the same size.

18. The light source as claimed in claim 11, wherein the cover is curved strip-shaped, and each of the dot light sources maintains a fixed distance relative to the cover.

19. The light source as claimed in claim 18, wherein the cover has flexibility.

20. A light module comprising:

a plurality of light bars arranged along a second axial direction, and each of the light bars comprises a plurality of dot light sources of a first axial direction; and

a cover covering the light bars, wherein the cover has a plurality of openings, and the distribution density of the openings increases from a corresponding location of a dot light source towards two opposite ends along the first axial direction.

21. The light module as claimed in claim 20, wherein the distribution density of the openings on the first axial direction initially increases then decreases from a corresponding location of a dot light source towards another location of an adjacent dot light source.

22. The light module as claimed in claim 20, wherein parts of the openings are directly opposite the dot light sources.

23. The light module as claimed in claim 20, wherein the distribution density of the openings are fixed along a second axial direction, and the first axial direction is substantially perpendicular to the second axial direction.

24. The light module as claimed in claim 20,

p_i=(i/1)^gamma×

(h/2)|<sub>i=0˜

1</sub>,

wherein i is the normalized variable of the openings'"'"' arrangement number along the first axial direction, h is the spacing value of the dot light source, gamma is the locational modulation coefficient, and p_i is the location of each corresponding opening and dot light source.

25. The light module as claimed in claim 20, wherein the cover is made of reflective diffusion material.

26. The light module as claimed in claim 20, wherein the cover is plate-shaped, and each of the dot light sources maintains a fixed distance relative to the cover.

27. The light module as claimed in claim 26, wherein the openings have the same size.

28. The light module as claimed in claim 20, wherein the cover is curved plate-shaped, and each of the dot light sources maintains a fixed distance relative to the cover.

29. The light module as claimed in claim 28, wherein the cover has flexibility.

30. An illumination device comprising:

a base having a central axial direction and a plurality of cavities surrounding the arranged central axial direction;

a plurality of light sources disposing separately on the cavities, wherein each of the light sources comprises;

a light bar locating in the corresponding cavity, and the light bar comprises a plurality of dot light sources; and

a cover assembling to the base for covering the cavity and the light bar inside of the cavity, wherein the cover has a plurality of openings, and the distribution density of the openings increases from a corresponding location of a dot light source towards another location of an adjacent dot light source.

31. The illumination device as claimed in claim 30, wherein the base is a spherical bulb base, each of the cavities is an arc-shaped gap on the spherical bulb base, and each of the covers is curved strip-shaped, so the cover and the base having an identical surface profile after the cover is assembled to the base.

32. The illumination device as claimed in claim 31, wherein the extension direction of each of the arc-shaped gap, the extension direction of the light bar, and the orientation of the dot light sources are all consistent with the central axial direction.

33. The illumination device as claimed in claim 30, wherein parts of the openings are directly opposite the dot light sources.

34. The illumination device as claimed in claim 30, wherein the distribution density of the openings increases from a corresponding location of a dot light source towards two opposite ends along the central axial direction.

35. The illumination device as claimed in claim 34, wherein the distribution density of the openings are fixed along a second axial direction, and the projection of the central axial direction on the cover is substantially perpendicular to the second axial direction.

36. The illumination device as claimed in claim 30,

p_i=(i/1)^gamma×

(h/2)|<sub>i=0˜

1</sub>,

wherein i is the normalized variable of the openings'"'"' arrangement number along the central axial direction, h is the spacing value of the dot light source, gamma is the locational modulation coefficient, and p_i is the location of each corresponding opening and dot light source.

37. The illumination device as claimed in claim 30, wherein the cover is made of reflective diffusion material.

38. The illumination device as claimed in claim 30, wherein each of the dot light sources maintains a fixed distance relative to the cover.

39. The illumination device as claimed in claim 30, wherein the openings have the same size.

40. The illumination device as claimed in claim 30, wherein each of the covers have flexibility.