Lightpipe with multiple projections

• US 7,352,950 B2
• Filed: 01/16/2007
• Issued: 04/01/2008
• Est. Priority Date: 08/31/2004
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Bui, An Hong
• Primary Examiner(s): HEALY, BRIAN
• Application Number:
  US11/653,591
• Publication Number:
  US 20070115684A1
• Time in Patent Office: 441 Days
• Field of Search: 385/146, 385/901, 385/36, 385/129, 385/130, 385/131, 362/606, 362/607, 362/620
• US Class Current: 385/146
• CPC Class Codes: B60Q 3/14 lighting through the surface to be illuminated
• CPC Class Codes: B60Q 3/64 for a single lighting device
• CPC Class Codes: G02B 6/0001 specially adapted for lighting devices or systems lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G09F 9/305 being the ends of optical fibres G09F9/302 takes precedence
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

A lightpipe includes at least first and second projections extending outwardly from the body of the lightpipe, where the first projection is opposite the second projection.

Claims

1. A visual display apparatus comprising:

a lightpipe having a solid body portion;

a first projection extending outwardly from the body portion; and

a second projection extending outwardly from the body portion in a direction substantially 180 degrees from the first projection, the first and second projections each have a centerline that is common with a centerline with the body portion, have planar distal ends parallel to each other, and have different geometric cross-sections configured to produce different geometric illumination patterns;

one of the first and second projections having its distal end adapted to receive light from an external source and the other of the first and second projections having its distal end adapted to transmit the light outwardly.

2. The apparatus of claim 1 wherein the distal ends are disposed to accommodate the transmission of light.

3. The apparatus of claim 1 wherein the body portion comprises a first planar surface and second planar surface parallel to the first planar surface, the first and second projections extending from the first and second planar surfaces, respectively.

4. The apparatus of claim 3 wherein at least the first planar surface includes a keying mechanism that assists in aligning the first projection with an aperture in a panel to which the lightpipe is mounted.

5. The apparatus of claim 4 wherein the keying mechanism comprises at least two spaced-apart recesses in the lightpipe body portion dimensioned to receive and align with two spaced-apart rods on the panel.

6. The apparatus of claim 1 wherein the first and second projections have a common centerline that is also a centerline of the body portion.

7. The apparatus of claim 1 further comprising a panel with an aperture dimensioned to receive the first projection, and a source of light located to provide illumination into the lightpipe through the second projection.

8. The apparatus of claim 7 wherein the source of light is mounted substantially adjacent a distal end of the second projection.

9. The apparatus of claim 8 wherein the first and second projections have a common centerline that is also a centerline of the body portion.

10. The apparatus of claim 9 wherein the distal ends are disposed to accommodate the transmission of light.

11. The apparatus of claim 7 wherein the body portion comprises a first planar surface and second planar surface parallel to the first planar surface, the first and second projections extending perpendicularly from the first and second planar surfaces, respectively.

12. The apparatus of claim 11 wherein at least the first planar surface includes a keying mechanism that assists in aligning the first projection with the aperture in the panel to which the lightpipe is mounted.

13. The apparatus of claim 12 wherein the keying mechanism comprises at least two spaced-apart recesses in the lightpipe body portion dimensioned to receive two spaced-apart rods on the panel.

14. The apparatus of claim 1 wherein at least the surfaces of the body portion reflect internal light rays to reduce the loss of light.

15. The apparatus of claim 7 wherein the source of light comprises a light emitting diode.

16. The apparatus of claim 1 wherein the different geometric shapes comprise each projection having a different cross-sectional two dimensional shape.

17. The apparatus of claim 1 wherein the body portion and projections are molded of the same material as a single unitary construction.

18. An electronic apparatus having a visual display comprising:

a panel with an aperture;

a lightpipe having a solid body portion;

a first projection extending outwardly from the body portion;

a second projection extending outwardly from the body portion in a direction substantially 180 degrees opposite the first projection, the first and second projections each have a centerline that is common with a centerline with the body portion, have planar distal ends parallel to each other, and have different geometric cross-sections configured to produce different geometric illumination patterns;

means for mounting the lightpipe so that the first projection extends through the aperture; and

source of light mounted adjacent the lightpipe so as to provide illumination into the lightpipe through the planar distal end of the second projection to cause at least the distal end of the first projection to emit light.

19. The apparatus of claim 18 wherein the distal ends are disposed to accommodate the transmission of light.

20. The apparatus of claim 18 wherein the body portion comprises a first planar surface and second planar surface parallel to the first planar surface, the first and second projections extending from the first and second planar surfaces, respectively.

21. The apparatus of claim 20 wherein at least the first planar surface includes a keying mechanism that assists in aligning the first projection with an aperture in a panel to which the lightpipe is mounted.

22. The apparatus of claim 21 wherein the keying mechanism comprises at least two spaced-apart recesses in the lightpipe body portion dimensioned to receive and align with two spaced-apart rods on the panel.

23. The apparatus of claim 20 wherein the first and second projections have a common centerline that is also a centerline of the body portion.

24. The apparatus of claim 18 wherein the source of light is mounted substantially adjacent a distal end of the second projection.

25. The apparatus of claim 24 wherein the first and second projections have a common centerline that is also a centerline of the body portion.

26. The apparatus of claim 18 wherein at least the surfaces of the body portion reflect internal light rays to reduce the loss of light.

27. The apparatus of claim 18 wherein the source of light comprises a light emitting diode.

28. The apparatus of claim 18 wherein the different geometric shapes comprise each projection having a different cross-sectional two dimensional shape.

29. The apparatus of claim 18 wherein the body portion and projections are molded of the same material as a single unitary construction.

30. A visual display apparatus comprising:

a lightpipe having a solid body portion;

at least first, second, third and fourth projections each extending outwardly from the body portion and each having a planar distal end; and

the second projection extending outwardly from the body portion in a direction substantially 180 degrees opposite the first projection, the fourth projection extending outwardly from the body portion in a direction substantially 180 degrees opposite the third projection, all of said projections each having different geometric shapes to produce different geometric illumination patterns, the planar distal end of one of the first, second, third and fourth projections adapted to receive light from an external source and the distal end of the projection extending 180 degrees from said one adapted to transmit the light outwardly.

31. The apparatus of claim 30 wherein each of said projections have a distal end disposed to accommodate the transmission of light.

32. The apparatus of claim 30 wherein the body portion comprises a first planar surface and second planar surface parallel to the first planar surface, the first and second projections extending from the first and second planar surfaces, respectively, a third planar surface and fourth planar surface parallel to the third planar surface, the third and fourth projections extending from the third and fourth planar surfaces, respectively.

33. The apparatus of claim 32 wherein at least the first planar surface includes a keying mechanism that assists in aligning the first projection with an aperture in a panel to which the lightpipe is mounted.

34. The apparatus of claim 33 wherein the keying mechanism comprises at least two spaced-apart recesses in the lightpipe body portion dimensioned to receive and align with two spaced-apart rods on the panel.

35. The apparatus of claim 32 wherein the first and second projections have a first common centerline that is also centerline of the body portion, and the third and fourth projections have a second common centerline.

36. The apparatus of claim 30 wherein the body portion and projections are molded of the same material as a single unitary construction.

37. A visual display apparatus comprising:

a lightpipe having a solid body portion;

a first means associated with the body for producing a first geometric illumination pattern in a first direction extending outwardly from the body portion; and

a second means associated with the body and disposed substantially 180 degrees opposite the first means for producing a second geometric illumination pattern in a second direction extending outwardly from the body portion, the first and second means each having a distal end where a distal end of one of the first and second means is disposed to receive light from an external source and the distal end of the other of the first and second means is disposed to transmit the light outwardly.

38. The apparatus of claim 37 wherein the first and second means each comprise a projection with a distal end disposed to accommodate the transmission of light.

39. The apparatus of claim 37 wherein the body portion comprises a first planar surface and second planar surface parallel to the first planar surface, the first and second means extending from the first and second planar surfaces, respectively.

40. The apparatus of claim 39 wherein at least the first planar surface includes a keying mechanism that assists in aligning the first means with an aperture in a panel to which the lightpipe is mounted.

41. The apparatus of claim 40 wherein the keying mechanism comprises at least two spaced-apart recesses in the lightpipe body portion dimensioned to receive and align with two spaced-apart rods on the panel.

42. The apparatus of claim 37 wherein the first and second means have a common centerline that is also a centerline of the body portion.