LIGHTING DEVICE AND METHOD FOR MANUFACTURING A LIGHTING DEVICE

• US 20160116120A1
• Filed: 01/04/2016
• Published: 04/28/2016
• Est. Priority Date: 12/22/2010
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: KWISTHOUT, CORNELIS WILHELMUS
• Granted Patent: US 10,330,297 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21S 10/005 using light guides light guides specially adapted for lighting devices G02B6/0001
• CPC Class Codes: F21S 4/26 of rope form, e.g. LED lighting ropes, or of tubular form
• CPC Class Codes: F21V 23/003 the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
• CPC Class Codes: F21W 2121/00 Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2107/70 on flexible or deformable supports or substrates, e.g. for changing the light source into a desired form
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/001 the light being emitted along at least a portion of the lateral surface of the fibre
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: H05K 1/028 Bending or folding regions of flexible printed circuits H05K1/0283 takes precedence
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/051 Rolled
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10113 Lamp

Abstract

A lighting device for providing decorative lighting is disclosed. In one embodiment, the lighting device comprises a base, said base comprises a base for retro-fitting a traditional incandescent light bulb, a continuous optical element in which a string of a plurality of light emitting diodes is arranged, and an envelope encapsulating said continuous optical element such that the lighting device resembles a traditional incandescent light bulb.

Claims

1. A lighting device for providing decorative lighting comprising:

a base, said base comprises a base for retro-fitting a traditional incandescent light bulb,

a continuous optical element in which a string of a plurality of light emitting diodes is arranged; and

an envelope encapsulating said continuous optical element such that the lighting device resembles a traditional incandescent light bulb.

2. The lighting device as defined in claim 1, wherein the continuous optical element forms a light guide;

and the light guide has an out-coupling surface for decorative illumination via the light guide.

3. The lighting device as defined in claim 2, wherein the light guide comprises an optical fiber made of a suitable material such as plastics or glass-fiber.

4. The lighting device as defined in claim 3, wherein the optical fiber is spirally wound.

5. The lighting device as defined in claim 1, wherein the continuous optical element comprises a spiral element disposed between substantially parallel elements.

6. The lighting device as defined in claim 5, wherein the spiral element is disposed perpendicular to the parallel elements.

7. The lighting device as defined in claim 2, wherein the plurality of light emitting diodes are disposed uniformly throughout the continuous optical element.

8. The lighting device as defined in claim 2, wherein the light guide is provided with diffusing means for out-coupling light.

9. The lighting device as defined in claim 8, wherein scattering or diffusing particles are provided on or inside the light guide such that light is scattered out of the light guide.

10. The lighting device as defined in claim 1, wherein the plurality of light emitting diodes are mounted on a substrate with the continuous optical element on top of it or encapsulating it.

11. The lighting device as defined in claim 10, wherein the substrate is a flexible printed circuit board.

12. The lighting device as defined in claim 1, wherein the envelope is at least semi-transparent such that the light guide is visible for providing a decorative effect.

13. The lighting device as defined in claim 2, wherein a first light emitting element is disposed on the based and configured to couple light directly into to the light guide.

14. The lighting device as defined in claim 13, wherein the first light emitting element is dimmable;

the lighting device further comprises electronic driving circuit provided with a power supply for converting mains voltage supply into an output signal suitable for driving the first light emitting element;

the electric driving circuit is configured to control the light intensity of the first light emitting element, and the electric driving circuit is further configured to modulate the brightness or color of the first light emitting element.

15. The lighting device as defined in claim 14, further comprising a second light emitting element disposed on the base and configured to emit light outside the light guide, wherein the electric driving circuit is configured to control the light intensity of the second light emitting element.

16. The lighting device as defined in claim 15, wherein the electric driving circuit adjusts the light intensity of the second light emitting element relative to the light intensity of the first light emitting element.

17. The lighting device as defined claim 15, wherein the second light emitting element comprises a colder color white LED configured to provide functional lighting.

18. The lighting device as defined in claim 13, wherein the electric driving circuit to sequentially switch on and off the first light emitting element, for providing a flame and flickering effect of the light guide.

19. The lighting device as defined claim 13, wherein the first light emitting element comprises at least a red LED, a green LED, and a blue LED;

wherein the lighting device further comprises electronic driving circuit provided with a power supply for converting mains voltage supply into an output signal suitable for driving the first light emitting element;

wherein at least one of the red LED, the green LED, and the blue LED may be modulated into different colors by controlling the red, the green and the blue LED.

20. The lighting device as defined claim 15, wherein the envelope comprises a globular structure that encloses the first and the second light emitting elements.