Lighting system

• US 6,586,882 B1
• Filed: 04/17/2000
• Issued: 07/01/2003
• Est. Priority Date: 04/20/1999
• Status: Expired due to Term

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Harbers, Gerard
• Primary Examiner(s): Patel, Vip
• Assistant Examiner(s): Williams, Joseph
• Application Number:
  US09/551,029
• Time in Patent Office: 1,170 Days
• Field of Search: 313/491-93, 313/631-32, 313/634-35, 313/110, 313/112, 313/113, 313/500, 313/498, 313/501, 313/502, 313/505, 313/506, 313/507, 313/510, 313/511, 313/512, 362/46, 362/235, 362/227, 362/544-45, 362/260, 362/84, 362/230, 362/255, 362/800, 362/806-810, 362/293, 362/259, 362/499, 362/560, 362/565-69, 362/559
• US Class Current: 313/634
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 3/10 characterised by coatings
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/13 the devices being of a type provided for in group H01L33/00
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: Y10S 362/80 Light emitting diode
• CPC Class Codes: Y10S 362/806 Ornamental or decorative

Abstract

The lighting system comprises a body (1) to emit visible light and an envelope (5) which is transparent to light. The invention is characterized in that the lighting system comprises at least one opto-electronic element (2, 2′) to emit light in a first wavelength range, in that the body (1) is provided with conversion means (3) for absorbing light emitted by the opto-electronic element (2, 2′) and re-emitting light in a second wavelength range, and in that the envelope (5) is provided with a coating (6) reflecting light of the first wavelength range. In a preferred embodiment, the opto-electronic elements (2, 2′) are light-emitting diodes, which preferably emit blue light. Preferably, the conversion means (3) consist of a luminescent material and can be excited, preferably, by light originating from the wavelength range of 400 to 500 nm. Preferably, the coating (6) comprises a multilayer optical filter and is, preferably, provided on an inside surface of the envelope (5). In operation, the luminous flux of the opto-electronic element is preferably equal to or higher than 5 lm. The body (1) may assume various shapes, such as a spiral-shaped coil, so that the lighting system resembles a carbon filament lamp. The lighting system according to the invention has a comparatively high luminous efficacy and a relatively long service life.

Claims

1. A lighting system comprising a shaped body disposed in an envelope which transmits light,

said lighting system comprising at least one opto-electronic element which includes means for emitting light in a first wavelength range,

said body being separate from and spaced from said envelope, and separate from said at least one opto-electronic element, and said body being provided with conversion means for converting light of the first wavelength range to light of a second wavelength range for transmission through the envelope, and

said envelope being provided with a coating which at least partly reflects light of the first wavelength range toward the conversion means.

2. A lighting system as claimed in claim 1, characterized in that the conversion means comprises a luminescent material.

3. An opto-electronic element as claimed in claim 2, characterized in that the opto-electronic element comprises a light-emitting diode.

4. A lighting system as claimed in claim 1, characterized in that the conversion means is excited by light originating from the wavelength range of 400 to 500 nm.

5. A lighting system as claimed in claim 1, characterized in that the coating comprises a multilayer reflective coating.

6. A lighting system as claimed in claim 1, characterized in that the coating reflects blue light.

7. A lighting system as claimed in claim 1, characterized in that the coating is provided at a surface of the envelope which is directed toward the body.

8. A lighting system as claimed in claim 1, characterized in that the body comprises a spirally wound wire.

9. A lighting system as claimed in claim 1, characterized in that the body comprises a cross-shaped element, a star-shaped element or other shape of decorative element.

10. A lighting system as claimed in claim 1, characterized in that, in operation, a luminous flux of the opto-electronic element (2, 2′

) is at least 5 lm.

11. A lighting system as claimed in claim 1, characterized in that the body has a surface on which the conversion means are provided.

12. A lighting system as claimed in claim 11, characterized in that the body has a further surface portion free from said conversion means.

13. A lighting system comprising a shaped body disposed in an envelope which transmits light,

said lighting system comprising at least one solid-state electroluminescent element which includes means for emitting light in a first wavelength range,

said envelope and said at least one element each having a respective shape, and said body having a body shape independent of the respective shapes,

said body being provided with conversion means for converting light of the first wavelength range to light of a second wavelength range for transmission through the envelope, and

said envelope being provided with a coating which at least partly reflects light of the first wavelength range toward the conversion means.

14. A lighting system as claimed in claim 13, characterized in that said first wavelength range is 400 to 500 nm.

15. A lighting system as claimed in claim 14, characterized in that the system comprises an adjusting ring for adjusting the color balance of said light of a second wavelength range.

16. A lighting system as claimed in claim 13, characterized in that the system further comprises a lamp cap, and means for dissipating heat generated by said electroluminescent element to said lamp cap.

17. A lighting system as claimed in claim 16, characterized in that said electroluminescent element produces at least 5 lm luminous flux.

18. A lighting system as claimed in claim 17, characterized in that said first wavelength range is 400 to 500 nm.

19. A lighting system as claimed in claim 18, characterized in that said electroluminescent element is a blue-light-emitting diode having a maximum of spectral emission in the wavelength range of 460 to 490 nm.

20. A lighting system as claimed in claim 19, characterized in that said means for converting light comprises a red luminescent material having a maximum of spectral emission in the wavelength range of 610 to 630 nm.