Patent Publication Number: US-2018040532-A1

Title: Heat sink

Description:
BACKGROUND 
     Electrical and mechanical devices may generate heat during operation. The heat generated during operation of a device may damage the device or make the device too hot to safely handle. Various methods of reducing the impact of generated heat have been devised. A heat sink is a device to absorb and dissipate generated heat from electrical and mechanical devices. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The following detailed description references the drawings, wherein: 
         FIG. 1  is a side view of an example heat dissipation system. 
         FIG. 2  is a side view of an example heat dissipation system. 
         FIG. 3  is a bottom perspective view of an example heat dissipation system of FIG. 
         FIG. 4  is a side view of an example heat dissipation system. 
         FIG. 5  is a side view of an example heat dissipation system, 
         FIG. 6  is a side view of an example heat dissipation system. 
         FIG. 7  is a side view of an example heat dissipation system, 
         FIG. 8  is a side perspective view of an example heat dissipation system of  FIG. 1  depicting a heat dissipation pattern. 
         FIG. 9  is a side perspective view of n example silhouette of an electronic device including a heat dissipation system of  FIG. 1 . 
         FIG. 10  is a side perspective view of an example silhouette of an electronic device including a heat dissipation system of  FIG. 1 . 
         FIG. 11  is a rear view of an example computing device including a heat dissipation system. 
     
    
    
     DETAILED DESCRIPTION 
     In the following discussion and in the claims, the term “couple” or “couples” is intended to include suitable indirect and/or direct connections. Thus, if a first component is described as being coupled to a second component that coupling may, for example, be: (1) through a direct electrical, mechanical, or thermal connection, (2) through an indirect electrical, mechanical, or thermal connection via other devices and connections, (3) through an optical electrical connection, (4) through a wireless electrical connection, and/or (5) another suitable coupling. The term approximately as used herein to modify a value is intended to be determined based on the understanding of one of ordinary skin in the art, and can, for example, mean plus or minus 10% of that value. 
     An “electronic device” may be any device operating under electrical power, such as, a display device, a computing device, etc. A “computing device” or “device” may be a desktop computer, laptop (or notebook) computer, workstation, tablet computer, mobile phone, smartphone, smart watch, smart wearable glasses, smart device, server, blade enclosure, imaging device, or any other processing device. An “imaging device” may be a hardware device, such as a printer, multifunction printer (MFP), or any other device with functionalities to physically produce graphical representation(s) (e.g., text, images, models etc.) on paper, photopolymers, thermopolymers, plastics, composite, metal, wood, or the like. In some examples, an MFP may be capable of performing a combination of multiple different functionalities such as, for example, printing, photocopying, scanning, faxing, etc. 
     A heat sink may be used to absorb and dissipate heat generated in an electrical or mechanical device. Some heat sinks operate by absorbing heat from heat generating devices or components and providing a large surface area from which the heat may be dissipated to a surrounding environment. In some heat sinks, a single or series of protrusions or fins may be used to provide a larger surface area from which heat may be dissipated to the surrounding environment. As the environment or area surrounding a heat sink absorbs dissipated heat, the temperature of that environment may increase. Heat sinks are often disposed in a device in a manner to dissipate heat to an area of the device or surrounding the device which will not be damaged by the dissipated heat or will not cause injury to an operator. However, as electrical and mechanical devices become smaller, there are fewer areas of the device or surrounding the device which will not be damaged by dissipated heat or cause injury to an operator. 
     To address these issues, in the examples described herein, a heat sink is described which reduces the ambient temperature of an area adjacent to or coupled to the heat sink to a range safe for human handling. In examples, the heat sink includes a heat insulation layer disposed on a distal end of a fin of the heat sink to reduce the ambient temperature surrounding the distal end of the fin. In such examples, the distal end of the fin may be of a lower temperature while the device is generating heat than in a heat sink without a heat insulation layer. In such an example, the heat sink may be disposed closer to or coupled to an outer surface of the device without increasing the temperature of the outer surface beyond a human safe range. 
     Referring now to the drawings,  FIG. 1  is a side view, of an example heat dissipation system  100 . In the example of  FIG. 1 , heat dissipation system  100  includes a thermoconductive base  110 , a fin  120  extending from a surface of thermoconductive base  110 , a device  150 , and a heat insulation layer  130 . In an example, heat insulation layer  130  may be disposed on a distal end of fin  120  to insulate the distal end of fin  120 . 
     In some examples, device  150  may be any type of heat generating device, such as, a memory, a battery, a central processing unit (CPU), a component on a printed circuit board, such as, a resistor, a capacitor, a diode, an inductor, a transistor, an integrated circuit (IC), etc. In such examples, device  150  may be thermally coupled to thermoconductive base  110  to transfer heat to thermoconductive base  110 . Thermoconductive base  110  may be comprised of any material to thermally conduct heat from a device coupled thereto. In some examples, thermoconductive base  110  may be comprised of a metal, a metal-alloy, a ceramic such as silicon carbide, etc. 
     In some examples, fin  120  may extend from a first surface of thermoconductive base  110  and device  150  may be coupled to a second surface of thermoconductive base  110  opposite the first surface. In an example, fin  120  may be extruded from the same material as thermoconductive base  110 . In other examples, fin  120  may be comprised of any material to thermally conduct heat and may be coupled to thermoconductive base  110  by any mechanism, such as a bonding mechanism, (glue, soldering, etc.), a fastening mechanism (screw, etc.), etc. In some examples, a plurality of fins  120  may extend from thermoconductive base  110 . 
     In some examples, heat insulation layer  130  may be comprised of any thermally insulating material to thermally insulate the distal end of fin  120 . In some examples, heat insulation layer  130  may be comprised of at least one of fiberglass, mineral wool, mineral fiber, mineral cotton, mineral fibre, man-made mineral fibre (MMMF), man-made vitreous fiber (MMVF) glass wool, ceramic fibers, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, polystyrene foam in polymeric resins (thermoplastic or thermoset resins), etc. In an example, heat insulation layer  130  may insulate the distal end of fin  120  from heat generated by device  150 . In such an example, the amount of heat radiated by the distal end of fin  120  may be reduced thereby reducing an ambient temperature surrounding the distal end of fin  120  compared to an example in which there is no heat insulation layer  130 . In some examples, between approximately 0.1 mm and approximately 10 mm of heat insulation layer  130  may be disposed on the distal end of fin  120 . 
       FIG. 3  is a bottom perspective view of example heat dissipation system  100  of  FIG. 1 .  FIG. 8  is a side perspective view of heat dissipation system  100  depicting a heat dissipation pattern. In the example of  FIG. 3 , heat insulation layer  130  may be disposed on less than an entire surface area of the distal end of fin  120 . In such an example, the ambient temperature surrounding the distal end of fin  120  may be reduced compared to an example in which there is no heat insulation layer  130 . Although depicted as having a circular cross-section in the example of  FIG. 3 , heat insulation layer  130  may be of any cross-sectional shape to cover a portion of the distant end of fin  120 . Furthermore, although  FIG. 3  depicts a plurality of fins  120  with the same shaped deposition of heat insulation layer  130 , the examples are not limited thereto and the shape of some or all of the depositions of heat insulation layer  130  on the plurality of fins  120  in  FIG. 3  may be different from each other. In some examples, some of the plurality of fins  120  may have a depositions of heat insulation layer  130  with a surface area less than the entire surface area of the distal end of fin  120  and the others of the plurality of fins  120  may have depositions of heat insulation layer  130  that completely cover the distal end of fin  120 . In the example of  FIG. 8 , the temperature of different areas of the heat dissipation system  100  are shown while device  150  is producing heat to be dissipated by heat dissipation system  100 . As shown in  FIG. 8 , heat generated by device  150  may be radially dissipated (i.e., radially transferred away) from device  150 . In the example of  FIG. 8 , the temperature of some of the distal ends of the plurality of fins  120  may remain within a human safe range of less than 110 degrees Fahrenheit. 
       FIG. 2  is a side view of an example heat dissipation system  200 . In the example of  FIG. 2 , heat dissipation system  200  includes a thermoconductive base  210 , a fin  220  extending from a surface of thermoconductive base  210 , a device  250 , and a heat insulation layer  230 . In an example, heat insulation layer  230  may be disposed on a distal end of fin  220  to insulate the distal end of fin  220 . 
     In some examples, device  250  may be any type of heat, generating device, such as, a memory, a battery, a CPU, a component on a printed circuit board, such as, a resistor, a capacitor, a diode, an inductor, a transistor, an IC, etc. In such examples, device  250  may be thermally coupled to thermoconductive base  210  to transfer heat to thermoconductive base  210 . Thermoconductive base  210  may be comprised of any material to thermally conduct heat from a device coupled thereto. In some examples, thermoconductive base  210  may be comprised of a metal, a metal-alloy, a ceramic such as silicon carbide, etc. 
     In some examples, fin  220  may extend from a first surface of thermoconductive base  210  and device  250  may be coupled to the first surface of thermoconductive base  210 . In some examples, a plurality of fins  220  may extend from thermoconductive base  210 . In the, example of  FIG. 2 , device  250  may be disposed in the center of the plurality of fins  220  on thermoconductive base  210 . In other examples, device  250  may be disposed on any location of the first surface of thermoconductive base  210 . In an example, fin  220  may be extruded from the same material as thermoconductive base  210 . In other examples, fin  220  may be comprised of any material thermally conduct heat and may be coupled to thermoconductive base  210  by any mechanism such as, a bonding mechanism, (glue, soldering, etc.), a fastening mechanism (screw, etc.), etc. 
     In some examples, heat insulation layer  230  may be comprised of any thermally insulating material to thermally insulate the distal end of fin  220 . In some examples, heat insulation layer  230  may be comprised of at least one of fiberglass, mineral wool, mineral fiber, mineral cotton, mineral fibre, MMMF, MMVF glass wool, ceramic fibers, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, polystyrene foam in polymeric resins (thermoplastic or thermoset resins), etc. In an example, heat insulation layer  230  may insulate the distal end of fin  220  from heat generated by device  250 . In such an example, the amount of heat radiated by the distal end of fin  220  may be reduced thereby reducing an ambient temperature surrounding the distal end of fin  220  compared to an example in which there is no heat insulation layer  230 . In some examples, between approximately 0.1 mm and approximately 10 mm of heat insulation layer  230  may be disposed on the distal end of fin  220 . 
     In some examples, heat insulation layer  230  may be disposed on less than an entire surface area of the distal end of fin  220  as described above with respect to  FIG. 3 . In such an example, the ambient temperature surrounding the distal end of fin  220  may be reduced compared with an example in which there is no heat insulation layer  230 . 
       FIG. 4  is a side view of an example heat dissipation system  400 . In the example of  FIG. 4 , heat dissipation system  400  includes a thermoconductive base  410 , a fin  420  extending from a surface of thermoconductive base  410 , a device  450 , a heat insulation layer  430 , and a heat radiation layer  440 . In an example, heat insulation layer  430  may be disposed on a distal end of fin  420  to insulate the distal end of fin  420 . 
     In some examples, device  450  may be any type of heat generating device, such as, a memory, a battery, a CPU, a component on a printed circuit board, such as, a resistor, a capacitor, a diode, an inductor, a transistor, an integrated circuit (IC), etc. In such examples, device  450  may be thermally coupled to thermoconductive base  410  to transfer heat to thermoconductive base  410 . Thermoconductive base  410  may be comprised of any material to thermally conduct heat from a device coupled thereto. In some examples, thermoconductive base  410  may be comprised of a metal, a metal-alloy, a ceramic such as silicon carbide, etc. 
     In some examples, fin  420  may extend from a first surface of thermoconductive base  410  and device  450  may be coupled to a second surface of thermoconductive base  410  opposite the first surface. In an example, fin  420  may be extruded from the same material as thermoconductive base  410 . In other examples, fin  420  may be comprised of any material thermally conduct heat and coupled to thermoconductive base  410  by any mechanism, such as, a bonding mechanism, (glue, soldering, etc.), a fastening mechanism (screw, etc.), etc. In some examples, a plurality of fins  420  may extend from thermoconductive base  410 , 
     In some examples, heat insulation layer  430  may be comprised of any thermally insulating material to thermally insulate the distal end of fin  420 . In some examples, heat insulation layer  430  may be comprised of at least one of fiberglass, mineral wool, mineral fiber, mineral cotton, mineral fibre, MMMF, MMVF glass wool, ceramic fibers, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, polystyrene foam in polymeric resins (thermoplastic or thermoset resins), etc. In an example, heat insulation layer  430  may insulate the distal end of fin  420  from heat generated by device  450 . In such an example, the amount of heat radiated by the distal end of fin  420  may be reduced thereby reducing an ambient temperature surrounding the distal end of fin  420  compared to an example in which there is no heat insulation layer  430 . In some examples, between approximately 0.1 mm and approximately 10 mm of heat insulation layer  430  may be disposed on the distal end of fin  420 . 
     In some examples, heat insulation layer  430  may be disposed on less than an entire surface area of the distal end of fin  420  as described above with respect to  FIG. 3 . In such an example, the ambient temperature surrounding the distal end of fin  420  may be reduced compared to an example in which there is no heat insulation layer  430 . 
     In some examples, heat radiation layer  440  may be disposed on fin  420  except a distal end of fin  420  on which heat insulation layer  430  is disposed. In such an example, heat radiation layer  420  may thermally dissipate heat from the surfaces of fin  420  on which it is disposed. In some examples, heat radiation layer  440  may be comprised of at least one of graphene, carbon nanotube. graphite, diamond-like-carbon, etc. Heat radiation layer  440  may be deposited on fin  420  in any manner, such as, physical deposition or vapor deposition. In some examples, heat radiation layer  440  may be disposed on all of fin  420  and then removed from the distal end of fin  420  by any mechanism, such as, mechanical polishing, chemical polishing, physical etching, chemical etching, etc. In the example of  FIG. 4 , a rate of heat dissipation from fin  420  may be increased compared with an example in which no heat radiation layer  440  is disposed on fin  420 . Although heat radiation layer  440  is depicted as disposed on fin  420  except a distal end thereof, the examples are not limited thereto and heat radiation layer  440  may be disposed on the first surface of thermoconductive base  410  to increase the rate of heat dissipation therefrom. In some examples, between approximately 1 μm and approximately 100 μm of heat radiation layer  440  may be disposed on fin  420  except a distal end thereof. 
       FIG. 5  is a side view of an example heat dissipation system  500 . In the example of  FIG. 5 , heat dissipation system  500  includes a thermoconductive base  510 , a fin  520  extending from a surface of thermoconductive base  510 , a device  550 , a heat insulation layer  530 , and a heat radiation layer  540 . In an example, heat insulation layer  530  may be disposed on a distal end of fin  520  to insulate the distal end of fin  520 . 
     In some examples, device  550  may be any type of heat generating device, such as, a memory, a battery, a CPU, a component on a printed circuit board, such as, a resistor, a capacitor, a diode, an inductor, a transistor, an IC, etc. In such examples, device  550  may be thermally coupled to thermoconductive base  510  to transfer heat to thermoconductive base  510 . Thermoconductive base  510  may be comprised of any material to thermally conduct heat from a device coupled thereto. In some examples, thermoconductive base  510  may be comprised of a metal, a metal-alloy, a ceramic such as silicon carbide, etc. 
     In some examples, fin  520  may extend from a first surface of thermoconductive base  510  and device  550  may be coupled to the first surface of thermoconductive base  510 . In some examples, a plurality of fins  520  may extend from thermoconductive base  510 . In the example of  FIG. 5 , device  550  may be disposed in the center of the plurality of fins  520  on thermoconductive base  510 . In other examples, device  550  may be disposed on any location of the first surface of thermoconductive base  510 . In an example, fin  520  may be extruded from the same material as thermoconductive base  510 . In other examples, fin  520  may be comprised of any material to thermally conduct heat and may be coupled to thermoconductive base  510  by any mechanism, such as, a bonding mechanism, (glue, soldering, etc.), a fastening mechanism (screw, etc.), etc. 
     In some examples, heat insulation layer  530  may be comprised of any thermally insulating material to thermally insulate the distal end of fin  520 . In some examples, heat insulation layer  530  may be comprised of at least one of fiberglass, mineral wool, mineral fiber, mineral cotton, mineral fibre, MMMF, MMVF glass wool, ceramic fibers, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, polystyrene foam in polymeric resins (thermoplastic or thermoset resins), etc. In an example, heat insulation layer  530  may insulate the distal end of fin  520  from heat generated by device  550 . In such an example, the amount of heat radiated by the distal end of fin  520  may be reduced thereby reducing an ambient temperature surrounding the distal end of fin  520  compared to an example in which there is no heat insulation layer  530 . In some examples, between approximately 0.1 mm and approximately 10 mm of heat insulation layer  530  may be disposed on the distal end of fin  520 . 
     In some examples, heat insulation layer  530  may be disposed on less than an entire surface area of the distal end of fin  520  as described above with respect to  FIG. 3 . In such an example, the ambient temperature surrounding the distal end of fin  520  may be reduced compared to an example in which there is no heat insulation layer  530 . 
     In some examples, heat radiation layer  540  may be disposed on fin  520  except a distal end of fin  520  on which heat insulation layer  530  is disposed. In such an example, heat radiation layer  520  may thermally dissipate heat from the surfaces of fin  520  on which it is disposed. In some examples, heat radiation layer  540  may be comprised of at least one of graphene, carbon nanotube, graphite, and diamond-like-carbon, etc. Heat radiation layer  540  may be deposited on fin  520  in any manner, such as, physical deposition or vapor deposition. In some examples, heat radiation layer  540  may be disposed on all of fin  520  and then removed from the distal end of fin  520  by any mechanism, such as, mechanical polishing, chemical polishing, physical etching, chemical etching, etc. In the example of  FIG. 5 , a rate of heat dissipation from fin  520  may be increased compared with an example in which no heat radiation layer  540  is disposed on fin  520 . Although heat radiation layer  540  is depicted as disposed on only on fin  520  except a distal end of fin  520 , the examples are not limited thereto and heat radiation layer  540  may be disposed on a portion of the first surface of thermoconductive base  510  not occupied by device  540  to increase the rate of heat dissipation. In some examples, between approximately 1 μm and approximately 100 μm of heat radiation layer  540  may be disposed on fin  520  except a distal end thereof. 
       FIG. 6  is a side view of an example heat dissipation system  600 . In the example of  FIG. 6 , heat dissipation system  600  includes a thermoconductive base  610 , a fin  620  extending from a surface of thermoconductive base  610 , a device  650 , a heat insulation layer  630 , and a heat radiation layer  640 . In an example, heat insulation layer  630  may be disposed on a distal end of tin  620  to insulate the distal end of fin  620 . 
     In some examples, device  650  may be any type of heat generating device, such as, a memory, a battery, a CPU, a component on a printed circuit board, such as, a resistor, a capacitor, a diode, an inductor, a transistor, an IC, etc. In such examples, device  650  may be thermally coupled to thermoconductive base  610  to transfer heat to thermoconductive base  610 . Thermoconductive base  610  may be comprised of any material to thermally conduct heat from a device coupled thereto. In some examples, thermoconductive base  610  may be comprised of a metal, a metal-alloy, a ceramic such as silicon carbide, etc. 
     In some examples, fin  620  may extend from a first surface of thermoconductive base  610  and device  650  may be coupled to a second surface of thermoconductive base  610  opposite the first surface. In an example, fin  620  may be extruded from the same material as thermoconductive base  610 . In other examples, fin  620  may be comprised of any material to thermally conduct heat and may be coupled to thermoconductive base  610  by any mechanism, such as, a bonding mechanism, (glue, soldering, etc.), a fastening mechanism (screw, etc.), etc. In some examples, a plurality of fins  620  may extend from thermoconductive base  610 . 
     In some examples, heat insulation layer  630  may be comprised of any thermally insulating material to thermally insulate the distal end of fin  620 . In some examples, heat insulation layer  630  may be comprised of at least one of fiberglass, mineral wool, mineral fiber, mineral cotton, mineral fibre, MMMF, MMVF glass wool, ceramic fibers, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, polystyrene foam in polymeric resins (thermoplastic or thermoset resins). In an example, heat insulation layer  630  may insulate the distal end of fin  620  from heat generated by device  650 . In such an example, the amount of heat radiated by the distal end of fin  620  may be reduced thereby reducing an ambient temperature surrounding the distal end of fin  620  compared to an example in which there is no heat insulation layer  630 . In some examples, between approximately 0.1 mm and approximately 10 mm of heat insulation layer  630  may be disposed on the distal end of fin  620 . 
     In some examples, heat insulation layer  630  may be disposed on less than an entire surface area of the distal end of fin  620  as described above with respect to  FIG. 3 . In such an example, the ambient temperature surrounding the distal end of fin  620  may be reduced compared to an example in which there is no heat insulation layer  630 . 
     In some examples, heat radiation layer  640  may be disposed on thermoconductive base  610  and fin  620  including on heat insulation layer  630  disposed on the distal end of fin  620 . In such an example, heat radiation layer  640  may thermally dissipate heat from thermoconductive base  610  and fin  620 . In some examples, heat radiation layer  640  may be comprised of at least one of graphene, carbon nanotube, graphite, and diamond-like-carbon, etc. Heat radiation layer  640  may be deposited on thermoconductive base  610  and fin  620  in any manner, such as, physical deposition or vapor deposition. In the example of  FIG. 6 , a rate of heat dissipation from thermoconductive base  610  and fin  620  may be increased compared with an example in which no heat radiation layer  640  is disposed on thermoconductive base  610  and fin  620 . Although heat radiation layer  640  is depicted as disposed on the first surface of thermoconductive base  610  and fin  620 , the examples are not limited thereto and heat radiation layer  640  may be disposed only on fin  620  or thermoconductive base  610  to increase the rate of heat dissipation therefrom. In some examples, between approximately 1 μm and approximately 100 μm of heat radiation layer  640  may be disposed on thermoconductive base  610  and fin  620 . 
       FIG. 7  is a side view of an example heat dissipation system  700 . In the example of  FIG. 7 , heat dissipation system  700  includes a thermoconductive base  710 , a fin  720  extending from a surface of thermoconductive base  710 , a device  750 , a heat insulation layer  730 , and a heat radiation layer  740 . In an example, heat insulation layer  730  may be disposed on a distal end of fin  720  to insulate the distal end of fin  720 . 
     In some examples, device  750  may be any type, of heat generating device, such as, a memory, a battery, a CPU, a component on a printed circuit board, such as, a resistor, a capacitor, a diode, an inductor, a transistor, an IC, etc. In such examples, device  750  may be thermally coupled to thermoconductive base  510  to transfer heat to thermoconductive base  710 . Thermoconductive base  710  may be comprised of any material to thermally conduct heat from a device coupled thereto. In some examples, thermoconductive base  710  may be comprised of a metal, a metal-alloy, a ceramic such as silicon carbide, etc. 
     In some examples, fin  720  may extend from a first surface of thermoconductive base  710  and device  750  may be coupled to the first surface of thermoconductive base  710 . In some examples, a plurality of fins  720  may extend from thermoconductive base  710 . In the example of  FIG. 7 , device  750  may be disposed in the center of the plurality of fins  720  on thermoconductive base  710 . In other examples, device  750  may be disposed on any location of the first surface of thermoconductive base  710 . In an example, fin  720  may be extruded from the same material as thermoconductive base  710 . In other examples, fin  720  may be comprised of any material to thermally conduct heat and may be coupled to thermoconductive base  710  by any mechanism, such as, a bonding mechanism, (glue, soldering, etc.), a fastening mechanism (screw, etc.), etc. 
     In some examples, heat insulation layer  730  may be comprised of any thermally insulating material to thermally insulate the distal end of fin  720 . In some examples, heat insulation layer  730  may be comprised of at least one of fiberglass, mineral wool, mineral fiber, mineral cotton, mineral fibre, MMMF, MMVF glass wool, ceramic fibers, cellulose, calcium silicate, cellular glass, elastomeric foam, phenolic foam, vermiculite, polyurethane foam, polystyrene foam in polymeric resins (thermoplastic or thermoset resins). In an example, heat insulation layer  730  may insulate the distal end of fin  520  from heat generated by device  750 . In such an example, the amount of heat radiated by the distal end of fin  520  may be reduced thereby reducing an ambient temperature surrounding the distal end of fin  720  compared to an example in which there is no heat insulation layer  730 . In some examples, between approximately 0.1 mm and approximately 10 mm of heat insulation layer  630  may be disposed on the distal end of fin  620 . 
     In some examples, heat insulation layer  730  may be disposed on less than an entire surface area of the distal end of fin  720  as described above with respect to  FIG. 3 . In such an example, the ambient temperature surrounding the distal end of fin  720  may be reduced compared to an example in which there is no heat insulation layer  730 . 
     In some examples, heat radiation layer  740  may be disposed on thermoconductive base  710 , except an area surrounding device  750  and under device  750 , and fin  720 . In such an example, heat radiation layer  740  may thermally dissipate heat from the portions of thermoconductive base  710  on which it is disposed and fin  720 . In some examples, heat radiation layer  740  may be comprised of at least one of graphene, carbon nanotube, graphite, and diamond-like-carbon, etc. Heat radiation layer  740  may be deposited on thermoconductive base  710  and fin  720  in any manner, such as, physical deposition or vapor deposition. In the example of  FIG. 7 , a rate of heat dissipation from thermoconductive base  710  and fin  720  may be increased compared with an example in which no heat radiation layer  740  is disposed on thermoconductive base  710  and fin  720 . Although heat radiation layer  740  is depicted as disposed on the first surface of thermoconductive base  710  and fin  720 , the examples are not limited thereto and heat radiation layer  740  may be disposed only on fin  720  or thermoconductive base  710  to increase the rate of heat dissipation therefrom. In some examples, between approximately 1 μm and approximately 100 μm of heat radiation layer  740  may be disposed on thermoconductive base  710  and fin  720 . 
       FIG. 9  is a side perspective view of an example silhouette of an electronic device  900  including a heat dissipation system  100 . In an example, electronic device  900  may be any electronic device including a circuit board  980  on which a device  150  may be disposed. In an example, electronic device  900  may be a monitor, display, television, etc. Circuit board  980  may be coupled to a surface of thermoconductive base  110  opposite a surface from which a plurality of fins  120  extend. Heat insulation layer  130  may be disposed on a distal end of fins  120 . Electronic device  900  may include a first surface  910  coupled to the distal end of fins  120 . In such an example, as described above with respect to  FIG. 1 , the ambient temperature surrounding the distal end of fin  120  may be reduced compared to an example in which there is no heat insulation layer  130 . In such an example, first surface  910  of electronic device  900  may remain at a lower temperature compared to an example in which there is no heat insulation layer  130 . In such an example, the temperature of first surface  910  may remain within a temperature range that is suitable for human contact while device  150  is generating heat. Although electronic device  900  is depicted including heat dissipation system  100 , any of heat dissipation systems  200  and  400 - 700  may be included in the electronic device  900 . In such examples, the temperature of first surface  910  may remain within a temperature range that is suitable for human contact while a device coupled thereto is generating heat. 
       FIG. 10  is a side perspective view of an example silhouette of an electronic device  1000  including a heat dissipation system  100 . In an example, electronic device  1000  may be any electronic device including a circuit board  1080  on which a device  150  may be disposed. In an example, electronic device  1000  may be a monitor, display, television, etc. Circuit board  1080  may be coupled to a surface of heat insulation layer  130  opposite a surface of thermoconductive base  110  from which a plurality of fins  120  extend. Heat insulation layer  130  may be disposed on a distal end of fins  120 . Electronic device  1000  may include a first surface  1010  adjacent to a distal end of fins  120  on which heat insulation layer  130  is disposed. In such an example, first surface  1010  of electronic device  1000  may remain at a lower temperature compared to an example in which there is no heat insulation layer  130  on the distal end of fins  120 . In such an example, the temperature of first surface  1010  may remain within a temperature range that is suitable for human contact while device  150  is generating heat. Although electronic device  1000  is depicted including heat dissipation system  100 , any of heat dissipation systems  200  and  400 - 700  may be included in the electronic device  1000 . In such examples, the temperature of first surface  1010  may remain within a temperature range that is suitable for human contact while a device coupled thereto is generating heat. 
       FIG. 11  is a rear view of an example computing device  1100  including a heat dissipation system. In an example, computing device  1100  may be any computing device including a heat dissipation system, such as, heat dissipation systems  100 ,  200 , and  400 - 700  described above. In  FIG. 11 , computing device  1100  may include a first surface  1110  disposed adjacent to a heat dissipation system (not shown) which includes holes  1115  to expel air to an external environment. In the example of  FIG. 11 , first surface  1110  and/or air expelled from holes  115  may remain within a temperature range safe for human contact while computing device  1100  generates heat because a heat dissipation system therein includes a heat insulation layer disposed adjacent to or in contact with first surface  1100 . 
     While certain implementations have been shown and described above, various changes in form and details may be made. For example, some features that have been described in relation to one implementation and/or process can be related to other implementations. In other words, processes, features, components, and/or properties described in relation to one implementation can be useful in other implementations. Furthermore, it should be understood that the systems, apparatuses, and methods described herein can include various combinations and/or sub-combinations of the components and/or features of the different implementations described. Thus, features described with reference to one or more implementations can be combined with other implementations described herein. 
     The above discussion is meant to be illustrative of the principles and various examples of the present disclosure. Numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated. It is intended that the following claims be interpreted to embrace all such variations and modifications.