Heat sink lamp and method for manufacturing a heat sink

• US 20090315442A1
• Filed: 04/03/2006
• Published: 12/24/2009
• Est. Priority Date: 04/01/2005
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Lemnis Lighting Patent Holding B.V.
• Inventors: Rooymans, Johannes Otto
• Granted Patent: US 7,911,118 B2
• Time in Patent Office: Days
• US Class Current: 313/46
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 17/12 by screwing
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

The invention relates to a heat sink (1) for cooling a light element. The heat sink (1) has a thermally conducting inner part (2) suitable for accommodating the light element. The heat sink (1) additionally has a thermally conducting outer part (3) which encloses the inner part in at least one plane. The at least one light element is galvanically shielded from the thermally conducting inner part. The inner part (2) and the outer part (3) can be joined to one another via at least one thermally conducting bridging link (4) in such a way that there is at least one opening (5) between the inner part (2) and the outer part (3).

Claims

1. Heat sink for cooling at least one light element (10;

26), the heat sink (1) comprising;

a thermally conducting inner part (2;

20) suitable for accommodating the at least one light element (10;

26);

a thermally conducting outer part (3;

22) that surrounds the inner part in at least one plane;

characterised in that the at least one light element (10;

26) is galvanically shielded from the thermally conducting inner part (2;

20).

2. Heat sink according to claim 1, characterised in that at least one of the inner part (2;

20) and outer part (3;

22) is made of anodised aluminium.

3. Heat sink according to one of the preceding claims, characterised in that the inner part (2;

20) comprises first fastening means (17) for fastening to a lamp cap (11).

4. Heat sink according to one of the preceding claims, characterised in that the inner part (2;

20) comprises second fastening means (16) for detachable fastening to a lamp globe (15).

5. Heat sink according to one of the preceding claims, characterised in that the outer part (22) has a cylindrical structure with a variable diameter and the inner part (20) can be clipped into the outer part (22).

6. Heat sink according to claim 5, characterised in that the inner part (20) comprises a disc with at least one concentric trough-shaped structure (24).

7. Heat sink (1) according to claim 5 or 6, characterised in that the outer part (22) is provided with at least one hole (29).

8. Heat sink according to one of claims 1-4, characterised in that the heat sink (1) further comprises at least one thermally conducting bridging link (4), which joins the inner part (2) and the outer part (3) to one another in such a way that there is at least one opening (5) between the inner part (2) and the outer part (3).

9. Heat sink according to claim 8, characterised in that the inner part (2) is an essentially circular disc and the outer part (3) a ring surrounding the inner part.

10. Heat sink according to claim 8 or 9, characterised in that at least one of an outer periphery of the inner part (2) and an inner periphery of the outer part (3) has a wavy surface pattern.

11. Heat sink according to one of claims 8-10, characterised in that the inner part (2), the outer part (3) and the at least one bridging element (4) consist of one piece.

12. Heat sink according to one of preceding claims 8-11, characterised in that the at least one bridging element (4) is made of anodised aluminium.

13. Heat sink according to one of claims 8 to 12, characterised in that the inner part (2) is provided with means to promote thermal conduction for improving the thermal conduction from the inner part (2) to the outer part (3).

14. Lamp comprising:

a lamp cap (11) for positioning the lamp and connecting the lamp to an electrical source;

at least one light element (10;

26) with a light emission side and a fastening side; and

a heat sink (1) according to one of the preceding claims,

the fastening side of the at least one light element (10;

26) being connected to the inner part (2;

20) of the heat sink (1).

15. Lamp according to claim 14, characterised in that the at least one light element (10;

26) is a light-emitting diode (LED).

16. Lamp according to claim 15, characterised in that the fastening side of the at least one light element is joined to the inner part (2;

20) of the heat sink (1) via a thermally conducting ceramic layer (25).

17. Lamp according to claim 16, characterised in that the thermally conducting ceramic layer (25) has a thickness of 100-500 μ

m.

18. Lamp according to claim 16 or 17, characterised in that the thermally conducting ceramic layer (25) comprises at least one ceramic material from the group of aluminium oxide and aluminium nitride.

19. Lamp according to one of claims 14-18, characterised in that the lamp furthermore comprises a transparent protective body which shields the at least one light dement (10;

26) on the light emission side of the light element (10;

26).

20. Lamp according to one of claims 14-19, characterised in that the lamp furthermore comprises a lamp globe (15) situated on the light emission side of the at least one light element (10;

26).

21. Method for manufacturing a heat sink from a base material according to one of claims 1 to 4 and 9 to 12 comprising:

providing base material in an enclosed space;

providing an extrusion die with a suitable pattern on one side of the enclosed space;

hearing the base material to a predetermined temperature;

extruding the base material by pressing the base material under pressure through the extrusion die so that an extruded elongated object is formed;

subdividing the extruded elongated object into a predetermined size, thereby forming pieces corresponding to the heat sink according to one of claims 1-4 and 9-12.