Lighting device with overlapping and offset heat sinks

• US 9,897,262 B2
• Filed: 12/18/2014
• Issued: 02/20/2018
• Est. Priority Date: 01/11/2011
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Inventors: Marinus, Antonius Adrianus Maria, Bukkems, Peter Johannes Martinus, Nikol, Hans, Van Der Padt, Arie
• Primary Examiner(s): Negron, Ismael
• Application Number:
  US14/574,452
• Publication Number:
  US 20150103538A1
• Time in Patent Office: 1,160 Days
• 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 9/90 Methods of manufacture
• CPC Class Codes: F21V 17/10 characterised by specific fastening means or way of fastening F21V17/02 - F21V17/08 take precedence
• CPC Class Codes: F21V 19/004 by deformation of parts or snap action mountings, e.g. using clips
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21V 29/502 characterised by the adaptation for cooling of specific components
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/86 Ceramics or glass
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05K 1/00 Printed circuits
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10393 Clamping a component by an element or a set of elements
• CPC Class Codes: H05K 3/202 using self-supporting metal foil pattern
• CPC Class Codes: Y10T 29/49128 Assembling formed circuit to base

Abstract

A lighting device includes a first and second opposed light sources, a first and second electrically insulating heat sink elements having overlapping portions separated by a distance, and a first and second flexible electrically conducting layers arranged in contact with the first and second light sources, respectively. The first and second electrically conducting layers are mounted to the first and second heat sink elements, respectively. The first and second heat sink elements each include a recess having shape of the first and second electrically conducting layers, respectively.

Claims

1. A lighting device comprising:

a first and second light sources, wherein the second light source is disposed opposing the first light source;

a first and second electrically insulating heat sink elements having overlapping portions separated by a distance; and

a first and second flexible electrically conducting layers,

wherein the first and second light sources are arranged in contact with the first and second electrically conducting layers, respectively,

wherein the first and second electrically conducting layers are mounted to the first and second heat sink elements, respectively, and

wherein the first and second heat sink elements each include a recess having shape of the first and second electrically conducting layers, respectively.

2. The lighting device according to claim 1, the light generated by the first light source is in a direction away from the light generated by the second light source.

3. The lighting device according to claim 1, wherein the recess formed in the first and second heat sinks aligns each of the electrically conductive layers and limits the movement of each of the first and second light sources.

4. The lighting device according to claim 1, wherein the first and the second electrically insulating heat sink elements each comprise an overlapping portion that is aligned at a central axis of the lighting device and a non-overlapping portion having an inner profile following an inner shape of the envelope.

5. The lighting device according to claim 1, further comprising an envelope enclosing the first and second light sources and the first and second heat sink elements.

6. The lighting device according to claim 5, wherein the first and second heat sink elements are plate-shaped with an inner profile following an inner shape of the envelope.

7. The lighting device according to claim 5, wherein the first and second heat sink elements are thermally coupled directly to the envelope.

8. The lighting device according to claim 5, wherein the envelope comprises two enveloping parts making mechanical and thermal contact with each other.

9. The lighting device according to claim 5, wherein at least part of each of the first and second heat sink elements and the envelope are one single integrated part.

10. The lighting device according to claim 1, further comprising flexible linear electric connection means extending up to each of the first and second light sources.

11. The lighting device according to claim 10, wherein each of said linear connection means is located on that side of said heat sink element which is opposite to the light source up to which this linear connection means extends.

12. A lighting device according to claim 11, wherein the distance between the first and second heat sink elements defines an overlap zone in which the linear connection means are arranged.