Systems and methods for coupling a metal core PCB to a heat sink

• US 10,208,940 B2
• Filed: 08/16/2017
• Issued: 02/19/2019
• Est. Priority Date: 05/03/2017
• Status: Active Grant

• Current Assignee: Fluence Bioengineering
• Original Assignee: Fluence Bioengineering, Inc. (Ams-Osram AG)
• Inventors: Duong, Dung, Johnson, Randall, Klase, Nicholas
• Primary Examiner(s): Vo, Tuyen K
• Application Number:
  US15/678,880
• Publication Number:
  US 20180320876A1
• Time in Patent Office: 552 Days
• Field of Search: 362218, 362373, 362547
• CPC Class Codes: A01G 9/20 Forcing-frames; Lights , i.e. glass panels covering the forcing-frames
• CPC Class Codes: A01G 9/249 Lighting means with special arrangements for promoting growth A01G7/045
• CPC Class Codes: F21V 19/0055 by screwing
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 29/502 characterised by the adaptation for cooling of specific components
• CPC Class Codes: F21V 29/67 characterised by the arrangement of fans
• CPC Class Codes: F21V 29/745 the fins or blades being planar and inclined with respect to the joining surface from which the fins or blades extend
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21W 2131/40 Lighting for industrial, commercial, recreational or military use
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F28D 2021/0029 Heat sinks
• CPC Class Codes: F28F 2255/16 extruded
• CPC Class Codes: F28F 3/02 Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations F28F3/08 takes precedence
• CPC Class Codes: F28F 3/025 the means being corrugated, plate-like elements
• CPC Class Codes: F28F 3/048 in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels
• CPC Class Codes: H01L 23/367 Cooling facilitated by shape of device H01L23/38, H01L23/40, H01L23/42, H01L23/44, H01L23/46 take precedence
• CPC Class Codes: H05K 1/021 : Components thermally connected to metal substrates or heat-sinks by insert mounting
• CPC Class Codes: H05K 1/05 : Insulated conductive substrates, e.g. insulated metal substrate
• CPC Class Codes: H05K 3/0061 : onto a metallic substrate, e.g. a heat sink heat sinks for electric apparatus H05K7/20
• CPC Class Codes: H05K 7/20409 : Outer radiating structures on heat dissipating housings, e.g. fins integrated with the housing

Abstract

Embodiments may utilize a series of exposed fins, which increase the surface area of the heat sink creating additional air flow. As hotter air rises within the system, cooler is drawn into the heatsink. The fins may be exposed on both sides of the longitudinal axis, allowing cooler air to be drawn towards the longitudinal axis above the heatsink and flow upward. This process may cool the fins. Additionally, the spacing between the fins may have to be wide enough to allow for air to freely enter the heatsink.

Claims

1. A heat sink for a light fixture comprising:

a plurality of fins positioned from a first end of the heat sink to a second end of the heat sink, the plurality of fins being positioned perpendicular to a central axis of the heat sink;

a base being coupled to lower surfaces of the plurality of fins, the base being comprised of metal core PCB, wherein the base does not cover an entirety of the lower surfaces of the plurality of fins;

angled protrusions positioned on the sides of the base, the angled protrusions extending in a downward direction away from the lower surfaces of the plurality of fins to create a space between upper surfaces of the angled protrusions and the lower surfaces of the plurality of fins.

2. The heat sink of claim 1, wherein outer edges of the angled protrusions are positioned between the sides of the base and sides of the fins.

3. The heat sink of claim 1, wherein the lower surfaces of the fins are extruded to form a contoured depression between overhangs, the overhangs being positioned on edges of the fins.

4. The heat sink of claim 3, wherein the base is configured to be positioned between the overhangs.

5. The heat sink of claim 4, wherein the base includes a plurality of rows of vents orifices, the plurality of rows of vent orifices being offset from the central axis of the heat sink.

6. A method for creating a heat sink for a light fixture, the method comprising:

coupling a base to lower surfaces of a plurality of fins, the plurality of fins being positioned from a first end of the heat sink to a second end of the heat sink, the plurality of fins having a fin width positioned perpendicular to a central axis of the heat sink, the base being comprised of metal core PCB, wherein the base does not cover an entirety of the lower surfaces of the plurality of fins;

creating orifices extending through the base, the orifices having an orifice length extending in a direction from the first end of the heat sink towards the second end of the heat sink, the orifice length being greater than an orifice width, wherein the orifices expose the central axis of the heat sink;

forming angled by bending the sides of the base along a direction in parallel with a longitudinal axis of the heat sink, the angled protrusions extending in a downward direction away from the lower surfaces of the plurality of fins to create a space between upper surfaces of the angled protrusions and the lower surfaces of the plurality of fins.

7. The method of claim 6, wherein a base width of the base is less than the fin width of the plurality of fins.

8. The method of claim 6, wherein outer edges of the angled protrusions are positioned between the sides of the base and sides of the fins.

9. The method of claim 6, further comprising:

extruding the lower surface of the fins to form a contoured depression between overhangs, the overhangs being positioned on edges of the fins.

10. The method of claim 9, further comprising:

positioning the base between the overhangs.

11. The method of claim 10, wherein the base includes a plurality of rows of vents orifices, the plurality of rows of vent orifices being offset from the central axis of the heat sink.

12. The method of claim 11, further comprising:

coupling the base to the fins via a plurality of coupling orifices that are aligned with the central axis of the heat sink.