Integrated Heat Spreader

Abstract

The heat spreader includes a longitudinal axis, a top surface opposite the bottom surface, and a plurality of domes formed within and extending from the bottom surface, each dome of the plurality of domes defined by a radius and a depth, the plurality of domes being longitudinally aligned with one another along the longitudinal axis.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to U.S. Provisional Application No. 63 / 329,620, filed April 11, 2022, which claims the benefit of U.S. Provisional Application No. 18 / 123,139, filed March 17, 2023, both of which are incorporated by reference herein in their entireties.

[0002] FIELD OF THEINVENTION FIELD OF THE DISCLOSURE The present disclosure relates generally to integrated heat spreaders and methods of forming integrated heat spreaders. [Background technology]

[0003] Heat spreaders are often used in computer chip packages to draw heat away from the chip, semiconductor die, and / or processor and transfer the heat to a heat sink for dissipation. FIG. 1 illustrates a system established in the art that incorporates the use of a heat spreader. Specifically, a substrate 10 is shown positioned beneath a chip, also referred to as a die, 12, which may be positioned adjacent to and beneath a thermal interface material sheet 14. In some applications, the thermal interface material sheet 14 is comprised of various types of polymers, such as silicone. The chip 12 and thermal interface material sheet 14 may be positioned adjacent to a heat spreader 20, which in some embodiments may be positioned within a recessed portion of the heat spreader 20. The heat spreader 20 is positioned adjacent to a second layer of thermal interface material 14. Adjacent to the second layer of thermal interface material 14, the system may include a heat sink 18.

[0004] As a result of the configuration described above, during operation of the chip 12, heat generated by the chip 12 is dissipated through the heat spreader 20 to the heat sink 18. The heat spreader 20 can distribute and spread the heat across the heat spreader 20, facilitating efficient heat transfer to the heat sink 18. In this way, the heat generated by the chip 12 does not cause localized damage to components within the system. The heat distributed by the heat spreader 20 can then be transferred to the heat sink 18 for dissipation.

[0005] As explained above, in some cases, the heat spreader 20 may have a recess or cavity configured to receive the chip 12. Figures 2A and 2B illustrate additional embodiments of the heat spreader 20. As illustrated, the heat spreader 20 includes a top side 22 and a bottom side 24 having a cavity 26 extending into the bottom side 24. During operation, the chip 12 (Figure 1) may be placed in the cavity 26. In these embodiments, it may be desirable to have the recess and / or cavity shaped and sized to engage the chip 12 that is being installed in the system.

[0006] During manufacturing, the heat spreader 20 may be formed in large quantities by cutting blanks from sheets or strips of bulk material and by using a combination of stamping processes to impart the desired shape and features to the blanks to ultimately produce the desired heat spreader. If the heat spreader 20 includes a cavity 26, the cavity 26 may be formed by stamping material from the blank into a shape and geometry configured to receive a processor or die during operation. During this process of stamping the heat spreader 20 to form the desired shape, the stamping force causes a cold flow of material from areas of high pressure to areas of low pressure. As such, a stamping system may be designed with a desired size and / or shape to create the target shape of the cavity 26. Summary of the Invention

[0007] The present disclosure provides a heat spreader having a longitudinal axis and including a top surface opposite a bottom surface, and a plurality of domes formed within and extending from the bottom surface, each dome of the plurality of domes defined by a radius and a depth, the plurality of domes being longitudinally aligned with one another along the longitudinal axis.

[0008] In one form thereof, the present disclosure provides a heat spreader including a top surface opposite the bottom surface, a first cavity within and extending upwardly from the bottom surface, the first cavity defined by a lateral radius and a depth, a second cavity within and extending upwardly from the bottom surface and positioned adjacent to the first cavity, the second cavity defined by a lateral radius and a depth, and a third cavity within and extending upwardly from the bottom surface and positioned adjacent to the second cavity, the third cavity defined by a lateral radius and a depth. The heat spreader further includes the first, second, and third cavities being defined by a generally dome-shaped profile.

[0009] In another of its forms, the disclosure provides a method of forming a heat spreader including stamping a central surface of a sheet of material with a die and press of a stamping system to transfer material outwardly from the central surface, constraining material on a top surface of the sheet of material into a substantially constant geometric shape, and during the constraining step, stamping a plurality of domes on a bottom surface of the sheet of material with a second die and a second press of a second stamping system to create the heat spreader. [Brief description of the drawings]

[0010] The above-described and other features of the invention, as well as the manner of achieving them, will become more apparent, and the invention itself will be better understood, by referring to the following description of the embodiments of the invention in conjunction with the accompanying drawings, in which: [Figure 1] 1 illustrates a schematic diagram of an exemplary use of a heat spreader. [Figure 2A] 1 illustrates a heat spreader as is commonly known in the art. [Figure 2B] 1 illustrates a heat spreader as is commonly known in the art. [Diagram 3] 1 illustrates a schematic diagram of an exemplary press machine that may be used to manufacture a heat spreader according to an embodiment of the present disclosure. [Figure 4A] 1 illustrates a bottom view of an exemplary heat spreader, according to an embodiment of the present disclosure. [Figure 4B] 4B illustrates a cross-sectional view of the heat spreader of FIG. 4A taken along line 4B-4B. [Figure 5A] 1 illustrates a bottom view of an exemplary heat spreader, according to an embodiment of the present disclosure. [Figure 5B] 5B illustrates a cross-sectional view of the example heat spreader of FIG. 5A taken along line 5B-5B, in accordance with an embodiment of the present disclosure. [Figure 6A] 1 illustrates a cross-sectional view of a workpiece according to an embodiment of the present disclosure. [Figure 6B] 6B illustrates a cross-sectional view of the workpiece of FIG. 6A positioned within a stamping system. [Figure 7A] 1 illustrates a cross-sectional view of a partially formed heat spreader positioned within a stamping system according to an embodiment of the present disclosure. [Figure 7B] 7B illustrates a cross-sectional view of the partially formed heat spreader of FIG. 7A. [Figure 8A] 1 illustrates a cross-sectional view of a heat spreader partially formed in a stamping system according to an embodiment of the present disclosure. [Figure 8B] 8B illustrates a cross-sectional view of a heat spreader fully formed within the stamping system of FIG. 8A. [Figure 8C] 8B illustrates a cross-sectional view of the heat spreader after processing in the stamping system of FIG. 8A. [Figure 9A] 1 illustrates a top view of a die for use in a stamping system according to an embodiment of the present disclosure. [Figure 9B] 9B illustrates a side elevation view of the die of FIG. 9A.

[0011] Corresponding reference characters indicate corresponding parts throughout the several views. Unless otherwise noted, the drawings are drawn to scale and to proportion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] FIG. 3 generally illustrates a stamping system 100 that may be used to form a heat spreader, as will be further described with reference to FIGS. 4-9B. Specifically, the stamping system 100 includes a plate 102 for fixing a die 104 in place. The die 104 and the plate 102 are fixed such that the die 104 and the plate 102 remain stationary during the stamping process. The stamping system 100 further includes a punch 106 configured to repeatedly move up and down in a vertical direction. In operation, a material, e.g., a sheet of metal, may be placed on the die 104, and the punch 106 may be actuated by a ram to move downwardly onto the material. During this process, the punch 106 is forced downwardly onto the material in the stamping system 100 to press the material to conform to the shape of the die 104 and / or punch 106. For example, as illustrated, the die 104 has a protrusion that extends upward, while the punch 106 has a corresponding V-shaped groove. As a result, once compressed, the workpiece between the die 104 and punch 106 has protrusions that match the shape of the protrusions of the die 104 and the grooves of the punch 106. Although the die 104 and / or punch 106 are illustrated as having protrusions, they may have a variety of shapes and configurations. For example, the die 104 and / or punch 106 may have a flat profile, a dome-shaped profile, or an otherwise irregularly shaped profile. The stamping system 100 may be used to form the heat spreader 120, as described further below, using the die 104 and punch 106 to perform one or more steps to cold-form a blank of material into the desired shape and configuration of the heat spreader 120.

[0013] 4A illustrates a bottom view of one embodiment of a heat spreader 120 that may be formed from a stamping process using, for example, the stamping system 100 of FIG. 3 or a variation thereof. The heat spreader 120 defines a rectangular shape having a first side 122a, a second side 122b, a third side 122c, and a fourth side 122d. A width W1 of the heat spreader 120 is defined by the distance between the second side 122b and the fourth side 122d, while the heat spreader 120 defines a height H1 defined by the distance between the first side 122a and the third side 122c. In some embodiments, the width W1 is approximately equal to the height H1 such that the heat spreader 120 is defined by a square shape, but in the illustrated embodiment, the width W1 is greater than the height H1.

[0014] The heat spreader 120 additionally includes a central surface that defines a number of domes 124 (FIG. 4B) that extend from the bottom surface 121 of the heat spreader 120. Illustratively, the domes 124 extend inwardly into the heat spreader 120 and are therefore also referred to herein as cavities. Illustratively, the plurality of cavities 124 include a first cavity 124a, a second cavity 124b, and a third cavity 124c. Each of the cavities 124 is generally circular in shape, although various other shapes and / or configurations of the cavities 124 may be incorporated. For example, the cavities 124 may be generally rectangular, triangular, or otherwise irregularly shaped. The ability to vary the shape and quantity of the cavities 124 provides the advantage of increasing the usage of the heat spreader 120, as the heat spreader 120 may be customized to work with a desired chip and / or processor. Additionally, as illustrated, the cavities may be longitudinally aligned with the longitudinal axis L of the heat spreader 120. However, in various other embodiments, the positioning of the cavities 124 may be staggered or otherwise arranged across the bottom surface 121 of the heat spreader 120.

[0015] As illustrated in the cross-sectional view of FIG. 4B, each of the cavities 124 includes a radius, illustratively a lateral radius R. Illustratively, the first cavity 124a includes a lateral radius Ra, the second cavity 124b includes a lateral radius Rb, and the third cavity 124c includes a radius Rc. In the illustrative embodiment of FIG. 4B, the values ​​of each radius Ra, Rb, and Rc are approximately equal to each other. The values ​​of the radii Ra-Rc may range from about 5 mm to 15 mm. However, in other embodiments, the values ​​of each radius Ra-Rc may differ from each other. Furthermore, the lateral radius R may or may not be equal to the maximum depth of each cavity 124. For example, as illustrated, each cavity 124 includes a depth D. Illustratively, the first cavity 124a includes a first depth D1, the second cavity 124b includes a second depth D2, and the third cavity 124c includes a third depth D3. Although illustrated as having the same value as each other, in some embodiments, the depth D of each individual cavity may vary. In embodiments, the values ​​of the depths D1, D2, and D3 may range from about 0.005 mm to 0.03 mm. Because the depth D of each cavity 124 extends inwardly into the heat spreader 120 from the bottom surface 121, the cavities 124 are classified as concave cavities 124. However, as further described herein with reference to FIGS. 5A-5B, the domes may have a convex configuration such that the depth D measures the amount that each cavity 124 protrudes downwardly from the bottom surface 121.

[0016] 4A-4B, the heat spreader 120 additionally includes a perimeter 126 extending along each side 122 of the heat spreader 120. The perimeter 126 includes a top surface 128 and a bottom surface 130, with the top surface 128 of the perimeter 126 positioned at a vertical height that is lower than the vertical height of the top surface 119 of the heat spreader 120. Similarly, the bottom surface 130 of the perimeter 126 is positioned at a vertical height that is lower than the vertical height of the bottom surface 121 of the heat spreader 120. In other words, the perimeter 126 is positioned between and spaced apart from the top surface 119 and bottom surface 121 of the heat spreader 120.

[0017] 5A-5B illustrate additional embodiments of the heat spreader 120. As illustrated in FIG. 5A, the heat spreader 120 includes a plurality of cavities, which may also be referred to herein as domes 224. In an embodiment, the plurality of domes 224 includes a first dome 224a, a second dome 224b, and a third dome 224c. Although the domes 224 are illustrated as being generally circular in shape, in various other embodiments, the shape of the domes 224 may be varied. For example, the domes 224 may be generally rectangular, triangular, polygonal, or otherwise irregular in shape. As shown in FIGS. 5A-5B, each of the plurality of domes 224 is defined by a radius R. Illustratively, the first dome 224a is defined by a radius Rd, the second dome 224b is defined by a radius Re, and the third dome 224c is defined by a radius Rf. In various embodiments, each of the radii Rd, Re, and Rf may be approximately equal, while in various other embodiments, the value of each radius Rd, Re, and Rf may vary relative to one another. Additionally, the radius R of each dome 224 extends outwardly relative to the bottom surface 121 of the heat spreader 120, such that the domes 224 may be classified as convex domes.

[0018] 6A-9B, an exemplary method for forming the heat spreader 120 of FIGS. 4A-4B is described. FIG. 6A illustrates a blank sheet 140, which may be formed from a metal, e.g., copper. The blank sheet 140 may also be referred to herein as a workpiece, which may be cut or otherwise produced from a larger piece of sheet stock. The blank sheet 140 is inserted into a stamping system 200 of FIG. 6B and undergoes processing to reconfigure the blank workpiece 140 into the desired shape (FIG. 4) of the target heat spreader 120. As illustrated, the stamping system 200 includes a die 204 and a punch 206, similar to the die 104 and punch 106 described and shown above with respect to FIG. 3. The die 204 and punch 206 are configured to be vertically actuated into contact with the blank sheet 140 to compress the blank sheet 140 between the die 204 and punch 206.

[0019] As illustrated, the punch 206 includes a bottom surface 210 having a flat and generally linear / planar profile. The bottom surface 210 does not include any contours and is horizontal across the width of the bottom surface 210. Additionally, the die 204 includes a top surface 208 having a flat and linear / planar profile. Similar to the bottom surface 210 of the punch 206, the top surface 208 of the die 204 does not include any contours and is substantially flat across the width of the top surface 208. However, as described further herein, the shape profiles of the top surface 208 and bottom surface 210 may be altered to achieve a desired embodiment of the heat spreader 120. Still referring to FIG. 6B, the stamping system 200 further includes a plurality of borders 214, illustratively a first border 214a and a second border 214b. Each border 214a, 214b is positioned on a side of the die 204. In other words, the die 204 is sandwiched between the boundaries 214a, 214b. As illustrated, the boundary 214 extends to a vertical height H2, which may be less than the vertical height H8 of the top surface 208 of the die 204. Although two boundaries 214 are shown in the cross-section of Figure 6B, it is understood that four boundaries 214 are provided corresponding to each of the four edges around the entire perimeter of the workpiece 140.

[0020] Further, the stamping system 200 additionally includes a plurality of outer walls 218, illustratively a first outer wall 218a and a second outer wall 218b, corresponding to the two additional boundaries described above, although the additional outer walls 218 are not shown. Each outer wall 218 is positioned adjacent a respective boundary 214 and adjacent the entire thickness of the heat spreader 120. In this manner, the stamping system 200 is configured as a closed tooling system, which means that as material is extruded and transferred outwardly from the blank sheet 140, it is contained within the outer walls 218 and cannot extend laterally outward beyond the outer walls 218. FIG. 7A illustrates the blank sheet 140 positioned within the stamping system 200 after the punch 206 has been compressed onto the blank sheet 140 and the die 204.

[0021] FIG. 7B illustrates the resulting intermediate shape of the blank sheet 140 after processing by the die 204 and punch 206, also referred to as a partially formed embodiment of the heat spreader 120. As such, FIG. 7B illustrates a partially completed embodiment of the heat spreader 120 with the central surface A formed by the punch 206 and die 204. Material displaced from the central surface A is extruded outwardly from the central surface A toward the sides of the blank sheet 140. As a result of the outer boundary 218 being positioned at a vertical height H3 that is higher than the vertical height H8 of the die 204, the stamping process of FIG. 6A, also shown in FIG. 7B, begins to create the outer perimeter 126 (FIG. 4) of the heat spreader 120. More specifically, the material at the outer edge of the heat spreader 120 is illustrated as extending downwardly perpendicular to the central surface A. The partially formed heat spreader 120 of FIG. 7B is then inserted into an additional stamping system 300, which is a further variation of stamping system 100 (FIG. 3), to undergo additional processing steps.

[0022] 8A illustrates the partially formed heat spreader 120 of FIG. 7B inserted into the stamping system 300 prior to additional compression of the blank sheet 140 within the stamping system 300. As illustrated, the stamping system 300 includes a die 304, a punch 306, a plurality of borders 314 positioned on either side of the die 304, and a plurality of outer walls 316 positioned adjacent the borders 314. Additionally, the stamping system 300 includes a plurality of top walls 318, illustratively a first top wall 318a and a second top wall 318b, it being understood that two additional top walls 318 are included to form a rectangular configuration. The top walls 318 are positioned around the punch 306 such that the punch 306 is laterally "sandwiched" or surrounded between and within the top walls 318. 8A, the top wall 318 is illustrated as extending to a vertical height H4, which may be greater than the vertical height H5 of the punch 306. In this manner, when the punch 306 and the top wall 318 are actuated downwardly to compress the partially formed heat spreader 120, the top wall 318 may extend to a vertical position below the vertical position of the punch 306, as will be further described with reference to FIG.

[0023] As illustrated in FIG. 8A, the die 304 includes a top surface 328 that includes a plurality of protrusions 330. In an embodiment, the plurality of protrusions 330 includes a first protrusion 330a, a second protrusion 330b, and a third protrusion 330c. In an embodiment, the protrusions 330 are each a dome extending from the top surface 328 of the die 304. In this embodiment, the punch 306 includes a bottom surface 310 and has a generally flat profile across the bottom surface 310. In this manner, when the punch 306 contacts the heat spreader 120 to compress the material into the die 304, the material on the top surface 119 (FIG. 7B) of the partially completed heat spreader 120 is held in place and pressed into a substantially constant geometric shape, while the protrusions 330 are compressed into the bottom surface 121 (FIG. 7B) of the heat spreader 120. The plurality of protrusions 330 press into the material, transporting the material laterally outward from the bottom surface 121 of the heat spreader 120 to each of the plurality of protrusions 330. As such, the material flows generally outwardly to form a recessed cavity 124 in the bottom surface 121 of the heat spreader 120, as illustrated in FIG. 8C. In these embodiments, the protrusions 330 may each include a lateral radius and depth corresponding to the resulting lateral radii Ra, Rb, Rc and depths D1, D2, D3 of the cavity 124 (FIG. 4), as will be further described with reference to FIGS. 9A-9B.

[0024] 9A-9B, specifically, a die 304 of a stamping system 300 is illustrated. Each protrusion 330 may have a lateral radius R and a depth D. In an illustrative embodiment, a first protrusion 330a is defined by a lateral radius Ra and a depth D1, a second protrusion 330b is defined by a lateral radius Rb and a depth D2, and a third protrusion 330c is defined by a lateral radius Rc and a depth D3. However, variations in the lateral radius and depth of the protrusions 330 may be incorporated. Additionally, various other shapes, sizes, and / or configurations of the protrusions 330a-330c may be incorporated based on the intended target configuration of the heat spreader. For example, to form the dome 224 as shown in Figures 5A-5B, the protrusion 330 can instead be a cavity extending inwardly from the upper surface 328 of the die 304, and the stamping process described above creates the convex dome 224.

[0025] 8A-8C, as previously disclosed, when the punch 306 is actuated downward, the top wall 318 may extend further downward than the punch 306. As such, material may flow outward and be compressed between the boundary 314 and the top wall 318. This compression forms a perimeter 126 of the heat spreader 120 that is spaced apart from the remainder of the heat spreader 120 and extends entirely around the perimeter of the heat spreader 120, such perimeter extending around at least a portion of each cavity 124. Although the above method has been described to form a heat spreader 120 having cavities 124 as shown in FIG. 4A, the method and configuration of the stamping system 100, 200 may be modified to result in various configurations of the heat spreader 120 and / or cavities, and the above configurations are provided for illustrative purposes only.

[0026] Aspects Aspect 1 is a heat spreader having a longitudinal axis, the heat spreader including a top surface opposite a bottom surface, and a plurality of domes formed within and extending from the bottom surface, each dome of the plurality of domes defined by a radius and a depth, the plurality of domes being longitudinally aligned with one another along the longitudinal axis.

[0027] Example 2 is the heat spreader of Example 1, wherein each of the plurality of domes is defined by a curved profile.

[0028] Example 3 is the heat spreader of Example 1 or Example 3, wherein the plurality of domes are defined by a first dome, a second dome, and a third dome.

[0029] A fourth aspect is the heat spreader of any of the first to third aspects, wherein each of the domes extends upward relative to a bottom surface of the heat spreader, such that each dome forms a cavity within the heat spreader.

[0030] A fifth aspect is the heat spreader of any one of the first to third aspects, wherein each of the domes extends downward relative to a bottom surface of the heat spreader.

[0031] A sixth aspect of the present invention is the heat spreader according to any one of the first to fifth aspects, wherein each of the plurality of domes has a radius of about 5 mm to 15 mm.

[0032] A seventh aspect is the heat spreader according to any one of the first to sixth aspects, wherein each of the plurality of domes has a depth of about 0.005 mm to 0.03 mm.

[0033] An eighth aspect is the heat spreader of any one of the first to seventh aspects, wherein the heat spreader is defined by a generally rectangular shape defined by at least four sides.

[0034] Example 9 is the heat spreader of Example 8, wherein the heat spreader includes a perimeter extending along each of four sides of the heat spreader.

[0035] Example 10 is the heat spreader of Example 9, wherein the perimeter is at least partially vertically offset from the bottom surface of the heat spreader.

[0036] An eleventh aspect is the heat spreader according to any one of the first to tenth aspects, wherein the heat spreader is made of copper.

[0037] Aspect 12 is a heat spreader including a top surface opposite the bottom surface, a first cavity within the bottom surface and extending upwardly from the bottom surface, the first cavity defined by a lateral radius and a depth, a second cavity within the bottom surface and extending upwardly from the bottom surface and positioned adjacent to the first cavity, the second cavity defined by a lateral radius and a depth, and a third cavity within the bottom surface and extending upwardly from the bottom surface and positioned adjacent to the second cavity, the third cavity defined by a lateral radius and a depth. The heat spreader further includes the first, second, and third cavities being defined by a generally dome-shaped profile.

[0038] Example 13 is the heat spreader of Example 12, wherein the lateral radius of the first cavity, the second cavity, and the third cavity is between about 5 mm and 15 mm.

[0039] A fourteenth aspect is the heat spreader according to any one of the twelfth and thirteenth aspects, wherein the depth of each of the first, second, and third cavities is about 0.005 mm to 0.03 mm.

[0040] Example 15 includes a method of forming a heat spreader comprising stamping a central surface of a sheet of material with a die and press of a stamping system to transfer material outward from the central surface, constraining material on a top surface of the sheet of material into a substantially uniform geometric shape, and during the constraining step, stamping a plurality of domes on a bottom surface of the sheet of material with a second die and second press of a second stamping system to create the heat spreader.

[0041] Example 16 is the method of example 15, wherein the die of the second stamping system includes a plurality of protrusions extending from a top surface of the die.

[0042] Example 17 is the method of example 15 or example 16, wherein during the step of stamping the multiple domes into the metal sheet to form the heat spreader, material flows laterally outward to form the periphery of the heat spreader.

[0043] Example 18 is the method of any of Examples 15-17, wherein the plurality of domes includes at least three domes and the plurality of protrusions of the die includes at least three protrusions.

[0044] Example 19 is the method of any of Examples 15-18, wherein the multiple domes extend inwardly relative to the bottom surface of the heat spreader, whereby the multiple domes define multiple cavities.

[0045] Example 20 is the method of any of Examples 15-18, wherein the plurality of domes extend downwardly relative to a bottom surface of the heat spreader.

[0046] While this invention has been described as having an exemplary design, the invention can be further modified within the spirit and scope of the disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention utilizing its general principles. Further, this application is intended to cover such departures from the disclosure as come within known or customary practice in the art to which this invention pertains.

Claims

1. 1. A heat spreader having a longitudinal axis, The top surface opposite the bottom surface, a plurality of domes formed in and extending from the base surface, each dome of the plurality of domes defined by a radius and a depth; The domes are longitudinally aligned with one another along the longitudinal axis.

2. The heat spreader of claim 1 , wherein each of said plurality of domes is defined by a curved profile.

3. The heat spreader of claim 1 , wherein the plurality of domes are defined by a first dome, a second dome, and a third dome.

4. The heat spreader of claim 1 , wherein each of the plurality of domes extends upwardly relative to the bottom surface of the heat spreader, such that each dome forms a cavity within the heat spreader.

5. The heat spreader of claim 1 , wherein each of the plurality of domes extends downwardly relative to the bottom surface of the heat spreader.

6. The heat spreader of claim 1 , wherein the radius of each of the plurality of domes is between about 5 mm and 15 mm.

7. The heat spreader of claim 1 , wherein the depth of each of the plurality of domes is between about 0.005 mm and 0.03 mm.

8. The heat spreader of claim 1 , wherein the heat spreader is defined by a generally rectangular shape defined by at least four sides.

9. The heat spreader of claim 8 , wherein the heat spreader includes a perimeter extending along each of the four sides of the heat spreader.

10. The heat spreader of claim 9 , wherein the perimeter is at least partially vertically offset from the bottom surface of the heat spreader.

11. The heat spreader of claim 1 , wherein the heat spreader is constructed from copper.

12. 1. A heat spreader comprising: The top surface opposite the bottom surface, a first cavity within the bottom surface and extending upwardly from the bottom surface, the first cavity being defined by a lateral radius and a depth; a second cavity within and extending upwardly from the bottom surface and positioned adjacent to the first cavity, the second cavity being defined by a lateral radius and a depth; a third cavity within and extending upwardly from the bottom surface and positioned adjacent to the second cavity, the third cavity being defined by a lateral radius and a depth; The first, second and third cavities are defined by a generally dome-shaped profile.

13. 13. The heat spreader of claim 12, wherein the lateral radius of the first cavity, the second cavity, and the third cavity is between about 5 mm and 15 mm.

14. The heat spreader of claim 12, wherein the depth of each of the first, second and third cavities is between about 0.005 mm and 0.05 mm.

15. 1. A method of forming a heat spreader, the method comprising: stamping a central surface of a sheet of material using a die and press of a stamping system; transferring the material outwardly from the central surface; constraining the material on an upper surface of the sheet of material into a substantially uniform geometric shape; and during the pressing step, stamping a plurality of domes on a bottom surface of the sheet of material using a second die and a second press of a second stamping system to create a heat spreader.

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