Lighting device and method for manufacturing a lighting device

• US 10,330,297 B2
• Filed: 01/04/2016
• Issued: 06/25/2019
• Est. Priority Date: 12/22/2010
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Signify Holding B.V. (Signify N.V.)
• Inventors: Kwisthout, Cornelis Wilhelmus
• Primary Examiner(s): Bannan, Julie A
• Application Number:
  US14/987,369
• Publication Number:
  US 20160116120A1
• Time in Patent Office: 1,268 Days
• Field of Search: 362555
• 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:

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

an envelope encapsulating said optical element;

wherein the optical element comprises a light guide encapsulating the plurality of light emitting diodes and having an out-coupling surface for decorative illumination via the light guide;

wherein the optical element comprises a spiral portion in a substantially horizontal plane with two substantially vertically extended portions connected to ends of the horizontal spiral portion; and

wherein due to a shape of the light guide, a color of the decorative illumination, an intensity of the decorative illumination, or a combination thereof, the decorative illumination via the light guide resembles a traditional incandescent light bulb comprising a filament.

2. The lighting device as defined in claim 1, wherein the light guide comprises an optical fiber made of a material including plastics or glass-fiber.

3. The lighting device as defined in claim 1, wherein the plurality of light emitting diodes are disposed uniformly throughout the optical element.

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

5. The lighting device as defined in claim 4, wherein the substrate is a flexible printed circuit board.

6. The lighting device as defined in claim 1, wherein the envelope is at least semitransparent such that the light guide is visible for providing the decorative illumination.

15. The lighting device as defined in claim 1 further comprising a base, wherein the base is one of a bayonet base and a screw base.

7. A lighting device for providing decorative lighting comprising:

a base comprising a heat-sink;

an optical element disposed on a base in which a first light emitting element is provided as a string of a plurality of light emitting diodes;

an envelope encapsulating said optical element;

wherein the optical element comprises a light guide encapsulating the plurality of light emitting diodes and having an out-coupling surface for decorative illumination via the light guide;

wherein the optical element comprises a spiral portion in a substantially horizontal plane with two substantially vertically extended portions connected to ends of the horizontal spiral portion;

wherein due to a shape of the light guide, a color of the decorative illumination, an intensity of the decorative illumination, or a combination thereof, the decorative illumination via the light guide resembles a traditional incandescent light bulb comprising a filament; and

second light emitting elements disposed on the base, each spaced apart from each other, and configured to emit light directly without having any light guide, wherein the second light emitting elements comprise light emitting diodes (LEDs).

8. The lighting device as defined in claim 7, 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.

9. The lighting device as defined in claim 8, wherein the electric driving circuit is configured to control the light intensity of the second light emitting elements.

10. The lighting device as defined in claim 9, wherein the electric driving circuit adjusts the light intensity of the second light emitting elements relative to the light intensity of the first light emitting element.

11. The lighting device as defined claim 7, wherein the second light emitting elements comprise white LEDs configured to provide functional lighting.

12. The lighting device as defined in claim 7, wherein the electric driving circuit is configured to sequentially switch on and off the first light emitting element, for providing a flame and flickering effect of the light guide.

13. The lighting device as defined claim 7, 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 are modulated into different colors by controlling the red, the green and the blue LED.

14. The lighting device as defined claim 7, wherein the envelope comprises a globular structure that encloses the first and the second light emitting elements.