# US 2018/0320880 A1 · Systems and methods for a heat sink with a folded fin

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- Number: US 2018/0320880 A1
- Document ID: US20180320880A1
- Status: Published application
- Kind: A1
- Application number: 15/678,855
- Filed: 2017-08-16
- Published: 2018-11-08
- Earliest claimed: 2017-05-03
- Assignees: Fluence Bioengineering, Inc.
- Applicants: Fluence Bioengineering
- Inventors: Dung Duong; Randall Johnson; Nicholas Klase
- Web page: https://patentgrep.com/patent/US20180320880A1

## CPC

- F21V 29/502: characterised by the adaptation for cooling of specific components
- A01G 9/20: Forcing-frames; Lights {, i.e. glass panels covering the forcing-frames}
- A01G 9/249: {Lighting means (with special arrangements for promoting growth A01G7/045)}
- F21V 23/009: {the casing being inside the housing of the lighting device}
- F21V 29/745: {the fins or blades being planar and inclined with respect to the joining surface from which the fins or blades extend}
- F21V 29/75: with fins or blades having different shapes, thicknesses or spacing
- F21V 29/76: with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
- F21V 29/763: {the planes containing the fins or blades having the direction of the light emitting axis}
- F21V 29/83: the elements having apertures, ducts or channels, e.g. heat radiation holes
- 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)
- H05K 1/021: {Components thermally connected to metal substrates or heat-sinks by insert mounting}
- H05K 7/20409: {Outer radiating structures on heat dissipating housings, e.g. fins integrated with the housing}
- H10W 40/22: characterised by their shape, e.g. having conical or cylindrical projections
- F21V 19/0055: {by screwing}
- F21V 29/67: characterised by the arrangement of fans
- F21W 2131/40: Lighting for industrial, commercial, recreational or military use
- F21Y 2103/10: comprising a linear array of point-like light-generating elements
- F21Y 2115/10: Light-emitting diodes [LED]
- F28D 2021/0029: {Heat sinks}
- F28F 3/025: {the means being corrugated, plate-like elements}
- F28F 3/048: {in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels}
- F28F 2255/16: extruded
- H05K 1/05: Insulated {conductive substrates, e.g. insulated} metal substrate
- H05K 3/0061: {onto a metallic substrate, e.g. a heat sink (heat sinks for electric apparatus H05K7/20)}
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)

## 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

### Claim 1

A heat sink comprising:
a unitary sheet of metal that is configured to be folded over itself to form a series of plurality of alternating first chambers and second chambers;
a first chamber being one of the plurality of first chambers, the first chamber being formed of a first fin and a second fin, and the first chamber having a first open lower surface;
a second chamber being one of the plurality of second chambers, the second chamber being formed of the second fin and a third fin, the second chamber having a second open upper surface and a second closed lower surface, wherein the first chamber is positioned adjacent to the second chamber.

### Claim 2 (depends on 1)

The heat sink of claim 1, wherein the first chamber and the second chamber include open sidewalls.

### Claim 3 (depends on 1)

The heat sink of claim 1, wherein the first chamber includes a first closed upper surface.

### Claim 4 (depends on 1)

The heat sink of claim 1, wherein the first chamber includes a first partially closed upper surface.

### Claim 5 (depends on 4)

The heat sink of claim 4, wherein the first partially closed upper surface is formed by cutting a first closed upper surface of the first chamber.

### Claim 6 (depends on 5)

The heat sink of claim 5, wherein the first closed upper surface is cut along a longitudinal axis of the heat sink.

### Claim 7 (depends on 6)

The heat sink of claim 6, wherein the first closed upper surface is cut such that a first portion of the first closed upper surface is a different size than a second portion of the first closed upper surface.

### Claim 8 (depends on 1)

The heat sink of claim 1, further comprising:
a base being configured to be coupled with the second closed lower surface, wherein the base is comprised of metal core PCB.

### Claim 9 (depends on 8)

The heat sink of claim 8, wherein side edges of the base includes downwardly angled protrusions.

### Claim 10 (depends on 8)

The heat sink of claim 8, wherein the base partially covers the first open lower surface.

### Claim 11

A method of forming a heat sink comprising:
folding a unitary sheet of metal over itself to form a series of plurality of alternating first chambers and second chambers, wherein a first chamber of the plurality of first chambers being formed of a first fin and a second fin, and the first chamber having a first open lower surface, and a second chamber of the plurality of second chambers being formed of the second fin and a third fin, the second chamber having a second open upper surface and a second closed lower surface, wherein the first chamber is positioned adjacent to the second chamber.

### Claim 12 (depends on 11)

The method of claim 11, wherein the first chamber and the second chamber include open sidewalls.

### Claim 13 (depends on 11)

The method of claim 11, wherein the first chamber includes a first closed upper surface.

### Claim 14 (depends on 11)

The method of claim 11, wherein the first chamber includes a first partially closed upper surface.

### Claim 15 (depends on 14)

The method of claim 14, further comprising:
cutting portions of a first closed upper surface of the first chamber to form the first partially closed upper surface, wherein the first partially closed upper surface includes open segments.

### Claim 16 (depends on 15)

The method of claim 15, wherein the first closed upper surface is cut along a longitudinal axis of the heat sink.

### Claim 17 (depends on 16)

The method of claim 16, wherein the first closed upper surface is cut such that a first portion of the first closed upper surface is a different size than a second portion of the first closed upper surface.

### Claim 18 (depends on 11)

The method of claim 11, further comprising:
coupling a base with the second closed lower surface, wherein the base is comprised of metal core PCB.

### Claim 19 (depends on 18)

The method of claim 18, wherein side edges of the base includes downwardly angled protrusions.

### Claim 20 (depends on 18)

The method of claim 18, further comprising:
partially covering the first open lower surface with the base.