Localized illumination device

• US 5,785,404 A
• Filed: 06/29/1995
• Issued: 07/28/1998
• Est. Priority Date: 06/29/1995
• Status: Expired due to Term

• Current Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Original Assignee: Siemens Microelectronics Incorporated (Siemens AG)
• Inventors: Wiese, Lynn
• Primary Examiner(s): Jones, Larry
• Application Number:
  US08/496,821
• Time in Patent Office: 1,125 Days
• Field of Search: 362/32, 362/61, 362/80, 362/83.3, 362/240, 362/800, 362/31
• US Class Current: 362/555
• CPC Class Codes: B60Q 3/14 lighting through the surface to be illuminated
• CPC Class Codes: B60Q 3/16 Circuits; Control arrangements
• CPC Class Codes: B60Q 3/64 for a single lighting device
• CPC Class Codes: B60Q 3/68 using ultraviolet light
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21W 2111/00 Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0006 Coupling light into the fibre in general G02B6/4298
• CPC Class Codes: G02B 6/0096 the lights guides being of the hollow type
• CPC Class Codes: G02B 6/4298 coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

Illumination apparatus for use in localized illumination applications, such as an automobile dashboard. The apparatus includes a light emitting diode mounted on a metallized circuit board; a TIR lens mounted over the light emitting diode to collect light emitted from the light emitting diode and to direct the light in a single direction; and a light pipe disposed over the light emitting diode and the TIR lens. The light pipe has walls extending from the circuit board to a plane above the circuit board such that directed light from the TIR lens is channeled through the light pipe to the plane. The apparatus can also include a cover disposed in the plane over the light pipe. The cover may be integrally molded to the light pipe and have an icon configured therein, such that the icon is illuminated by the light from the light emitting diode. A lens may also be placed over the cover of the light pipe to create a focused image of the icon, thereby maximizing the light emitted by the light emitting diode at the focused image.

Claims

1. Illumination apparatus, comprising:

(a) a light source at least partially disposed in a first plane;

(b) a total internal reflection optical element disposed over the light source; and

(c) a light pipe disposed over the light source and the total internal reflection optical element and extending to a second plane different from the first plane,

wherein light emitted from the light source is collected by the total internal reflection optical element and directed in a single direction through the light pipe, which channels the light to the second plane so that the light emitted by the light source is maximized at the second plane.

2. The illumination apparatus of claim 1, wherein the light source is a light emitting diode.

3. The illumination apparatus of claim 1, wherein the light source comprises a plurality of light emitting diodes.

4. The illumination apparatus of claim 3, wherein at least some of the light emitting diodes are of different colors from one another.

5. The illumination apparatus of claim 1, wherein the light pipe has a tapered configuration.

6. The illumination apparatus of claim 1, wherein the light pipe is configured to have the largest cross-sectional area at the end of the light pipe disposed in the first plane and the narrowest cross-sectional area at the end of the light pipe disposed in the second plane.

7. The illumination apparatus of claim 1, further comprising a cover that is at least partially translucent disposed in the second plane over the light pipe.

8. The illumination apparatus of claim 7, wherein the cover has an icon configured therein, such that said icon is illuminated by the light emitted from the light source.

9. The illumination apparatus of claim 7, wherein the cover is integrally molded to the light pipe.

10. The illumination apparatus of claim 1, further comprising a cover that is at least partially translucent and has an icon configured therein, said cover being disposed in a third plane over the light pipe and apart from the light pipe, such that the icon is illuminated by the light emitted from the light source to the second plane.

11. The illumination apparatus of claim 1, wherein the light pipe has a closed end at the second plane, said closed end being at least partially translucent.

12. The illumination apparatus of claim 11, wherein the closed end of the light pipe has an icon configured therein, such that said icon is illuminated by the light emitted from the light source.

13. The illumination apparatus of claim 12, further comprising a lens disposed in the second plane over the closed end of the light pipe so that the icon is illuminated by the light emitted by the light source and the image of the icon is focused by the lens to a third plane apart from the light pipe.

14. The illumination apparatus of claim 11, further comprising a cover that is at least partially translucent and has an icon configured therein, said cover being disposed in a third plane over the light pipe and apart from the light pipe, such that the icon is illuminated by the light emitted from the light source to the second plane.

15. The illumination apparatus of claim 11, further comprising:

a) a lens disposed in the second plane over the closed end of the light pipe to focus light emitted from the light source at a third plane apart from the light pipe and b) a cover that is at least partially translucent and has an icon configured therein, said cover being disposed in the third plane such that the icon is illuminated by the light emitted from the light source and focused by the lens.

16. The illumination apparatus of claim 1, further comprising a lens disposed in the second plane over the light pipe.

17. The illumination apparatus of claim 16, wherein the lens is a simple cylindrical lens.

18. The illumination apparatus of claim 16, wherein the lens is a holographic lens.

19. The illumination apparatus of claim 16, further comprising:

a) a lens disposed in the second plane over the light pipe to focus light emitted from the light source at a third plane apart from the light pipe and b) a cover that is at least partially translucent and has an icon configured therein, said cover being disposed in the third plane such that the icon is illuminated by the light emitted from the light source and focused by the lens.

20. The illumination apparatus of claim 1, further comprising:

a) a lens disposed in the second plane over the light pipe and b) a cover that is at least partially translucent and has an icon configured therein, said cover being disposed between the lens and the light pipe so that the icon is illuminated by the light emitted by the light source and the image of the icon is focused by the lens to a third plane apart from the light pipe.

21. The illumination apparatus of claim 1, wherein the light source is mounted on a substrate that is at least partially reflective, such that said substrate reflects light from the light source to the total internal reflection optical element.

22. Apparatus for use in an illuminated display, comprising:

(a) a light emitting diode mounted on a metallized substrate; and

(b) a total internal reflection lens mounted over the light emitting diode that collects light emitted from the light emitting diode and light reflected from the metallized substrate and directs the light in a single direction.

23. The apparatus of claim 22, further comprising:

(a) a light pipe disposed over the light emitting diode and the total internal reflection lens, said light pipe having walls extending from the substrate to a plane above the substrate, such that directed light from the total internal reflection lens is channeled through the light pipe to said plane; and

(b) a lens disposed in said plane over the light pipe that focuses the channeled light to a respective second plane.

24. The apparatus of claim 22, further comprising:

(a) a light pipe disposed over the light emitting diode and the total internal reflection lens, said light pipe having walls extending from the substrate to a plane above the substrate, such that directed light from the total internal reflection lens is channeled through the light pipe to said plane; and

(b) a cover disposed in said plane over the light pipe, said cover having an icon configured therein, such that the icon is illuminated by the light from the light emitting diode; and

(c) a lens disposed over the cover of the light pipe that creates a focused image of the icon so that the light emitted by the light emitting diode is maximized at said focused image.

25. The apparatus of claim 22, further comprising:

(a) a light pipe disposed over the light emitting diode and the total internal reflection lens, said light pipe having walls extending from the substrate to a plane above the substrate and having a closed end, with an icon configured therein, at said plane, such that directed light from the total internal reflection lens is channeled through the light pipe to said plane and the icon is illuminated by the light from the light emitting diode; and

(b) a lens disposed over the closed end of the light pipe that creates a focused image of the icon so that the light emitted by the light emitting diode is maximized at said focused image.

26. An illuminated display, comprising:

(a) a display panel having at least one symbol formed therein for viewing by an observer, and

(b) an illumination device that has a light source, an optical element that collects light from the light source and directs the light in one direction using total internal reflection, and a light pipe that channels the light from the optical element to illuminate the symbol in the display panel.

27. The display of claim 26, wherein the optical element comprises a base upon which the light source is mounted that reflects light emitted from the light source.

28. The display of claim 26, wherein the light pipe is configured to channel light from the optical element to illuminate the symbol with increased brightness.

29. The display of claim 26, wherein the light pipe is configured to channel light from the optical element to illuminate the symbol with increased intensity.

30. The display of claim 26, wherein the light pipe is mounted in the display panel and has the symbol formed therein.

31. The display of claim 26, wherein the light pipe has a lens to focus the channeled light to illuminate the symbol.

32. The display of claim 26, wherein the light pipe is mounted in the display panel and has the symbol formed therein and has a lens formed over the symbol to focus the image of the symbol to a respective plane apart from the display panel.