ILLUMINATION SYSTEM USING A PLURALITY OF LIGHT SOURCES

• US 20090059614A1
• Filed: 03/12/2008
• Published: 03/05/2009
• Est. Priority Date: 12/02/2002
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Schultz, John C., Meis, Michael A., Davis, Ronald D., Simbal, John J., DeBaun, Barbara A., Henson, Gordon D.
• Granted Patent: US 7,658,526 B2
• Time in Patent Office: Days
• US Class Current: 362/553
• CPC Class Codes: B60Q 1/0011 with light guides for distributing the light between several lighting or signalling devices
• CPC Class Codes: F21S 41/143 the main emission direction of the LED being parallel to the optical axis of the illuminating device
• CPC Class Codes: F21S 41/153 arranged in a matrix
• CPC Class Codes: F21S 41/155 Surface emitters, e.g. organic light emitting diodes [OLED]
• CPC Class Codes: F21S 41/24 Light guides
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: F21S 43/251 the light guides being used to transmit light from remote light sources
• CPC Class Codes: F21V 17/101 permanently, e.g. welding, gluing or riveting
• CPC Class Codes: F21W 2131/202 for dentistry
• CPC Class Codes: F21W 2131/205 for operating theatres
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/3668 with conversion in geometry of the cross section
• CPC Class Codes: G02B 6/3672 with fibres arranged in a regular matrix array
• CPC Class Codes: G02B 6/368 with pitch conversion between input and output plane, e.g. for increasing packing density
• CPC Class Codes: G02B 6/4204 the coupling comprising intermediate optical elements, e.g. lenses, holograms encapsulated active devices H01S5/02208, H01L33/52
• CPC Class Codes: G02B 6/4249 comprising arrays of active devices and fibres
• CPC Class Codes: G02B 6/425 Optical features semiconductor laser arrays H01S5/40; hybrid LED arrays H01L25/0753; monolithic LED arrays H01L27/153
• CPC Class Codes: H01L 2224/4554 Coating
• CPC Class Codes: H01L 2224/48091 : Arched
• CPC Class Codes: H01L 2224/48471 : the other connecting portion not on the bonding area being a ball bond, i.e. wedge-to-ball, reverse stitch
• CPC Class Codes: H01L 2224/48479 : on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/8592 : Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00014 : the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/58 : Optical field-shaping elements

Abstract

An illumination system includes a plurality of radiation generating sources, such as LED dies. A corresponding plurality of optical waveguides is also provided, with each waveguide having a first and a second end, with each first end being in optical communication with the corresponding LED die. An array of corresponding passive optical elements is interposed between the plurality of LED dies and the corresponding first ends of the plurality of optical waveguides. The illumination system provides for substantially high light coupling efficiency and an incoherent light output that can appear to the human observer as arising from a single point of light. In addition, the light can be output remotely at one or more locations and in one or more directions.

Claims

1. An illumination device, comprising:

a first plurality of radiation generating sources to generate optical radiation;

a first plurality of optical waveguides, wherein each of the plurality of optical waveguides includes a first end and a second end, wherein each first end is in optical communication with a corresponding radiation generating source of the first plurality of radiation generating sources;

a second plurality of radiation generating sources;

a second plurality of optical waveguides, each having first and second ends wherein each first end is in optical communication with a corresponding radiation generating source of the second plurality of radiation generating sources; and

an array of optical elements, wherein each optical element of the array of optical elements is interposed between a corresponding first end of the first and second pluralities of optical waveguides and the corresponding radiation generating source.

2. The illumination device according to claim 1, wherein the first plurality and second plurality of waveguides comprise a first plurality and a second plurality of optical fibers, wherein the second ends of the second plurality of optical fibers are bundled with the second ends of the first plurality of optical fibers to form a single light illumination source when illuminated.

3. The illumination device according to claim 1, wherein the first and second pluralities of radiation generating sources have different emission spectra.

4. The illumination device according to claim 3, wherein the first plurality of radiation generating sources emits white light.

5. The illumination device according to claim 1, wherein the first plurality and second plurality of waveguides comprise a first plurality and a second plurality of optical fibers, wherein the second ends of the second plurality of optical fibers are bundled in a first bundle and wherein the second ends of the first plurality of optical fibers are bundled in a second bundle, and wherein a first direction of output emission from the first bundle is different from a second direction of output emission from the second bundle.

6. The illumination device according to claim 1, further comprising:

a third plurality of radiation generating sources, and

a third plurality of optical waveguides, each having first and second ends wherein each first end is in optical communication with a radiation generating source of the third plurality of radiation generating sources.

7. The illumination device according to claim 6, wherein the first plurality of radiation generating sources comprises red emitting LED dies, wherein the second plurality of radiation generating sources comprises blue emitting LED dies, and wherein the third plurality of radiation generating sources comprises green emitting LED dies.

8. The illumination device according to claim 7, wherein the first, second, and third pluralities of LED dies respectively emit red, blue, and green radiation in concert to generate a variety of colored light.

9. The illumination device according to claim 7, wherein the first, second, and third pluralities of LED dies emit red, blue, and green radiation in concert to generate white light.

10. The illumination device according to claim 1, wherein the second plurality of radiation generating sources emits infrared radiation.

11. The illumination device according to claim 1, further comprising:

at least one first output optical element to direct output radiation from the second ends of the first plurality of optical waveguides along a first path; and

at least one second output optical element to direct output radiation from the second ends of the second plurality of optical waveguides along a second path.

12. A vehicular illumination system comprising the illumination device according to claim 1, wherein the first plurality of radiation generating sources is illuminatable for a low beam illumination.

13. The vehicular illumination system according to claim 12, wherein both the first and the second plurality of radiation generating sources are illuminated for a high beam illumination.

14. A vehicular illumination system comprising the illumination device according to claim 1, further comprising at least one of an infrared sensor and an infrared communications transceiver.

15. An illumination device, comprising:

a plurality of solid state radiation sources to generate optical radiation;

a plurality of optical fibers, wherein each of the plurality of optical fibers includes a first end and a second end, wherein each first end is in optical communication with a corresponding solid state radiation source of the plurality of solid state radiation sources; and

a plurality of non-refractive optical elements, wherein each optical element of the plurality of optical elements is interposed between a corresponding first end and the corresponding solid state radiation source, and wherein each non-refractive optical element is shaped to reflect concentrated light emitted by a corresponding solid state radiation source into a corresponding optical fiber.

16. The illumination device according to claim 15, wherein the plurality of solid state radiation sources comprise at least one of an array of vertical cavity surface emitting lasers and an array of LED dies.