US20070000643A1 - Heat sink - Google Patents
Heat sink Download PDFInfo
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- US20070000643A1 US20070000643A1 US11/515,786 US51578606A US2007000643A1 US 20070000643 A1 US20070000643 A1 US 20070000643A1 US 51578606 A US51578606 A US 51578606A US 2007000643 A1 US2007000643 A1 US 2007000643A1
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- Prior art keywords
- heat
- heat conductive
- conductive block
- heat dissipating
- dissipating
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- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- 238000005476 soldering Methods 0.000 claims description 6
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 230000017525 heat dissipation Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 10
- 239000004020 conductor Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the invention relates to a heat sink and, in particular to a heat sink with a heat dissipating base that has a three-dimensional curved surface.
- the heat dissipating device or system becomes indispensable equipment. If the heat produced by an electronic device is not released to the environment properly, the efficiency may deteriorate or the device may burn out. Therefore, the heat dissipating device is of particular importance to microelectronic devices (e.g. IC). With the increase in the density of elements and advance in the packaging technology, the IC's have even smaller areas. At the same time, the heat accumulated in each unit area grows. Therefore, highly efficient heat sinks always form an important research subject in the electronics industry.
- microelectronic devices e.g. IC
- the heat dissipating device is installed on the surface of a heat-generating device to remove the heat form the device.
- the heat dissipating devices can be categorized as planar and cylindrical ones.
- FIG. 1 is a schematic view of the conventional heat dissipating device 10 .
- FIG. 2 is a top view of the planar heat sink 20 shown in FIG. 1 .
- FIG. 3 is a side view of the planar heat sink 20 along the 3 - 3 cross section.
- the heat dissipating device 10 includes an axial-flow fan 12 and a planar heat sink 20 .
- the planar heat sink 20 has a copper or copper alloy heat conductive plate 24 , an aluminum or aluminum alloy heat dissipating shell 26 covering over the heat conductive plate 24 , and a plurality of aluminum or aluminum alloy heat dissipating fins 22 perpendicularly installed on the heat dissipating shell 26 .
- the fan 12 is embedded and fixed on the fins 22 of the heat sink 20 .
- the lower surface of the heat conductive plate 24 is attached onto a heat-producing device (e.g. a CPU, not shown in the drawing).
- the heat-producing device releases a lot of heat during operations. Since copper has an extremely good heat conductive property, the released heat rapidly flows toward the heat dissipating shell 26 and to the fins 22 through the heat conductive plate 24 . The fan 12 further blows the heat on the fins 22 away, thereby achieving the heat dissipation effect. However, the produced heat forms a heat flow field (see FIG. 3 ) within the heat conductive plate 24 . This results in a worse heat conductive effect in the central area of the base 24 . Moreover, the position that generates the most heat in a typical heat-producing device is the central region. Therefore, the central area of the heat conductive plate 24 in the planar heat sink 20 requires a better heat conducting element to enhance the dissipation effect.
- FIG. 4 shows another conventional heat dissipating device 30 .
- FIG. 5 is a top view of the cylindrical heat sink 40 in FIG. 4 .
- FIG. 6 is a side view of the cylindrical heat sink 40 along the 6 - 6 cross section.
- the heat dissipating device 30 contains an axial-flow fan 12 (same as in FIG. 1 ) and a cylindrical heat sink 40 .
- the cylindrical heat sink 40 is comprised of a copper or copper alloy heat conductive cylinder 44 , an aluminum or aluminum alloy heat dissipating shell 46 covering over the rim of the heat conductive cylinder 44 , and a plurality of aluminum or aluminum alloy fins 42 perpendicularly installed on the shell 46 .
- the fan 12 is embedded and fixed on the fins 42 of the heat sink 40 .
- the other surface of the heat sink 40 is then attached onto the heat-producing device (e.g. CPU).
- the heat released during the operation of the heat-producing device quickly flows to the heat conductive cylinder 44 , the heat dissipating shell 46 , and the fins 42 .
- the heat flows along the heat conductive cylinder 44 , the shell 46 , and the fins 42 in the axial direction toward to fan 12 .
- the fan then provides air convection to bring out the heat.
- the cylindrical heat sink 40 indeed solves the unsatisfactory heat dissipation effect in the central region of the planar heat sink 20 .
- the region close to the connection interface between the heat sink 40 and the fan 12 does not have a good dissipation effect. This obviously is a waste of available space in the heat dissipating device 30 . It is very unpractical to use such devices in small electronics.
- the heat conductive plate 24 of the heat sink 20 and the heat conductive cylinder 44 of the heat sink 40 are connected to the heat dissipating shell 26 , 46 by soldering, bonding, or high-pressure mounting, respectively. If the precision of the heat conductive plate 24 , he heat conductive cylinder 44 , and the heat sinks 26 , 46 is not high enough, air gaps may appear at the connection interfaces. Besides, soldering often increases the thermal resistance of the contact interface, also affecting the heat conduction effect of the heat sinks 20 , 40 .
- the invention provides an improved heat sink with a heat dissipating base that has a three-dimensional curved surface.
- FIG. 1 is the schematic view of a conventional heat dissipating device
- FIG. 2 is a top view of the planar heat sink in FIG. 1 ;
- FIG. 3 is a side view of the planar heat sink along the cross section 3 - 3 ;
- FIG. 4 is the schematic view of another conventional heat dissipating device
- FIG. 5 is a top view of the cylindrical heat sink in FIG. 4 ;
- FIG. 6 is a side view of the cylindrical heat sink along the cross section 6 - 6 ;
- FIG. 7 is a schematic view of the disclosed heat dissipating device
- FIG. 8 is a top view of the heat sink in the first embodiment of the invention.
- FIG. 9 is a side view of the heat sink in FIG. 8 along the cross section 9 - 9 ;
- FIG. 10A shows the thermal resistance of the heat dissipating base as a function of the ratio of the cross section width of the bottom surface of the heat conductive block and the cross section width of the heat conductive plate in the first embodiment of the invention
- FIG. 10B shows the thermal resistance of the heat dissipating base as a function of the ratio of the vertical height of the heat dissipating base and the vertical height between the lower surface of the heat dissipating base and the top of fins in the first embodiment
- FIG. 10C shows the thermal resistance of the heat dissipating base as a function of the angle subtended between the bottom surface and the side surface of the heat conductive block in the first embodiment
- FIG. 11 is a side view of the heat sink in the second embodiment along the cross section 11 - 11 ;
- FIG. 12 is a side view of the heat sink in the third embodiment along the cross section 12 - 12 .
- the disclosed heat sink is mounted on a heat-producing device, which can be a microprocessor or a central processing unit (CPU).
- the heat dissipating device 50 of the invention contains an axial-flow fan 12 and a first improved heat sink 60 .
- the heat sink 60 contains a heat dissipating base 70 with a three-dimensional curved surface and a plurality of heat dissipating fins 62 .
- the base 70 contains a heat conductive plate 64 and a heat conductive block 66 installed at the center of the topmost surface 61 of the heat conductive plate 64 .
- the fins 62 are mounted perpendicular to the topmost surface 61 of the heat conductive plate 64 and the side surface 68 of the heat conductive block 66 . Since the fins 62 are installed along the side surface 68 , they have different surface areas.
- the fan 12 can be fixed onto the heat sink 60 using four fixing elements (e.g. screws) on the fins 62 at the four corners.
- the heat sink 60 in the first embodiment is featured in that: the heat conductive plate 64 of the heat dissipating base 70 is installed with an approximately cylindrical heat conductive block 66 on the top surface 61 . That is, the bottom surface area of the block 66 is greater than its topmost surface area.
- the heat conductive block 66 and the heat conductive plate 64 are formed together using aluminum, aluminum alloys, copper, copper alloys that have high coefficient of thermal conduction to form a heat dissipating base 70 with a three-dimensional curved surface.
- the fins 62 on the heat dissipating base 70 are soldered or formed together with the heat dissipating base 70 .
- FIG. 10A shows the thermal resistance R of the heat dissipating base 70 as a function of the ratio d/D of the cross section width d of the bottom surface of the heat conductive block 66 and the cross section width D of the heat conductive plate 64 in the first embodiment of the invention.
- FIG. 10B shows the thermal resistance R of the heat dissipating base 70 as a function of the ratio h/H of the vertical height h of the heat dissipating base 70 and the vertical height H between the bottom surface 63 of the heat dissipating base 70 and the top of fins 62 in the first embodiment.
- FIG. 10C shows the thermal resistance R of the heat dissipating base 70 as a function of the angle ⁇ subtended between the bottom surface 67 and the side surface 68 of the heat conductive block 66 in the first embodiment.
- Parameters that affect the design of the heat conductive block 66 include the cross section width D of the heat conductive plate 64 , the cross section width d of the bottom surface of the heat conductive block, the vertical height h of the heat dissipating base 70 (the total height of the heat conductive plate 64 and the heat conductive block 66 ), the vertical height H from the lower surface 63 of the heat dissipating base 70 to the top of the fins 62 (the total height of the heat conductive plate 64 , the heat conductive block 66 , and the fins 62 ), the angle ⁇ between the bottom surface 67 and the side surface 68 of the heat conductive block 66 , and the thermal resistance R of the heat dissipating base 70 .
- the heat conductive block 66 in the first embodiment has the following features: (1) The cross section width d of its bottom surface is smaller than the cross section width D of the heat conductive plate 64 .
- the heat dissipating base 70 reaches a minimum thermal resistance, point A in FIG. 10A , when the ratio d/D approaches 0.5.
- (2) The vertical height h of the heat dissipating base 70 is smaller than or equal to the vertical height H from the lower surface of the heat dissipating base 70 to the top of the fins 62 ; that is, the height of the heat conductive block is not larger than the height of each fin 62 .
- the heat dissipating base 70 has a minimum thermal resistance, point B in FIG. 10B .
- the angle ⁇ between the lower surface 67 and the side surface 68 of the heat conductive block 66 is smaller than 90 degrees. In other words, the area of the lower surface 67 is greater than that of the topmost surface 65 .
- a is between 80 degrees and 85 degrees, the heat dissipating base 70 reaches a minimum thermal resistance, point C in FIG. 10C .
- the heat produced by the device can be transferred to each of the fins 62 through the disclosed heat conductive block 66 .
- the axial-flow fan 12 then provides air convection to bring away the heat.
- FIG. 11 is a side view of the heat sink 80 in a second embodiment of the invention along the 11 - 11 cross section.
- the current heat sink 80 contains a heat dissipating base 90 comprised of a heat conductive element 92 and a heat dissipating shell 94 covering over the heat conductive element 92 .
- the heat dissipating shell 94 and the heat dissipating base 90 are made of different metal materials.
- the heat conductive element 92 is made of copper and the heat dissipating shell 94 is made of aluminum.
- the heat dissipating fins 82 are formed together with the heat dissipating shell 94 , and they are only formed on the topmost surface 81 and the side surface 88 of the heat dissipating shell 94 . Otherwise, the heat conductive element 92 is similar to the heat dissipating base 70 . It also has a heat conductive plate 84 and a heat conductive block 86 formed thereon. It should be mentioned that the size, shape, composition, and property of the heat conductive plate 84 and the heat conductive block 86 in the current embodiment are similar to those in the first embodiment.
- the three-dimensional curved surface of the heat conductive element 92 is covered by the thin piece of heat dissipating shell 94 by soldering or high-pressure mounting.
- the lower surface 83 of the heat conductive element 92 i.e. the lower surface 83 of the heat conductive plate 84
- the parameters in designing the heat conductive block 86 are different from those in the first embodiment only in that the cross section width d is the width of the bottom surface 87 of the heat conductive block 86 plus the widths of the heat dissipating shell 94 on both sides.
- the shape of the heat conductive block 86 is particularly designed according to the heat flow field inside the heat conductor and the coefficient of thermal conduction obtained from experiments.
- the experimental results in the current embodiment are also similar to FIGS. 10A, 10B , and 10 C and the heat dissipation effect is the same as in the first embodiment, so we do not repeat here.
- the composition and structure of the third embodiment of the heat sink 100 are the same as those of the heat sink 80 .
- the heat sink 100 has a screw 102 for connecting the heat dissipating shell 94 and the heat conductive block 86 .
- the heat dissipating shell 94 has a through hole 104
- the heat conductive block 86 is formed with a trench 106 corresponding to and with the same diameter as the through hole 104 .
- Another feature of the current embodiment is that when the heat conductive element 92 and the heat dissipating shell 94 are combined together, the screw 102 with a diameter slightly larger than those of the through hole 104 and the trench 106 is inserted into the through hole 104 of the heat dissipating shell 94 .
- the screw 102 is rotated into the trench 106 on the heat conductive block 86 by hand or machine.
- the heat dissipating shell 94 is then tightly connected to the heat conductive element 92 through the screw 102 . Therefore, it can avoid increase in thermal resistance due to the connection of two different metals by soldering.
- the side surface of the heat conductive block does not need to be a plane. It can be a smooth and curved surface.
- the fins can be made into other shapes that have larger heat dissipating areas. These modifications are still within the scope of the invention but not further described herein.
- a distinct characteristic of the invention is that: all the heat sinks 60 , 80 , 100 in the embodiments of the invention have heat dissipating bases 70 , 90 with a three-dimensional curved surface. They are designed according to the heat flow field inside the heat conductors and data of coefficient of thermal conduction obtained from experiments. Therefore, they solve the problems of inferior heat dissipation in the conventional planar and the cylindrical heat sinks. With the connecting element introduced in the third embodiment, the heat dissipation effect of the disclosed heat sink can be further improved.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
A heat sink for coolers is provided. The heat sink contains a heat conductive element, a heat dissipating shell covering over the heat conductive element, and a plurality of heat dissipating fins installed on the heat dissipating shell. The heat conductive element includes a heat conductive plate and a heat conductive block installed at the center thereof. The area of the bottom surface of the heat conductive block is greater than that of the topmost surface thereof. When the lower surface of the heat conductive plate is in contact with a device that needs heat dissipation, the heat conductive block increases the heat conducting volume at the center of the heat conductive plate, so that the heat produced by the device can be released at an optimal rate.
Description
- This application is a Division of co-pending application Ser. No. 10/339,488, filed on Jan. 10, 2003, the entire contents of which are hereby incorporated by reference and for which priority is claimed under 35 U.S.C. §120.
- The invention relates to a heat sink and, in particular to a heat sink with a heat dissipating base that has a three-dimensional curved surface.
- With the increasing efficiency of electronic devices, the heat dissipating device or system becomes indispensable equipment. If the heat produced by an electronic device is not released to the environment properly, the efficiency may deteriorate or the device may burn out. Therefore, the heat dissipating device is of particular importance to microelectronic devices (e.g. IC). With the increase in the density of elements and advance in the packaging technology, the IC's have even smaller areas. At the same time, the heat accumulated in each unit area grows. Therefore, highly efficient heat sinks always form an important research subject in the electronics industry.
- Generally speaking, the heat dissipating device is installed on the surface of a heat-generating device to remove the heat form the device. According to the shape of the base, the heat dissipating devices can be categorized as planar and cylindrical ones.
- Please refer to
FIGS. 1, 2 and 3.FIG. 1 is a schematic view of the conventionalheat dissipating device 10.FIG. 2 is a top view of theplanar heat sink 20 shown inFIG. 1 .FIG. 3 is a side view of theplanar heat sink 20 along the 3-3 cross section. As shown in these drawings, theheat dissipating device 10 includes an axial-flow fan 12 and aplanar heat sink 20. Theplanar heat sink 20 has a copper or copper alloy heatconductive plate 24, an aluminum or aluminum alloyheat dissipating shell 26 covering over the heatconductive plate 24, and a plurality of aluminum or aluminum alloy heat dissipating fins 22 perpendicularly installed on theheat dissipating shell 26. Thefan 12 is embedded and fixed on thefins 22 of theheat sink 20. The lower surface of the heatconductive plate 24 is attached onto a heat-producing device (e.g. a CPU, not shown in the drawing). - The heat-producing device releases a lot of heat during operations. Since copper has an extremely good heat conductive property, the released heat rapidly flows toward the
heat dissipating shell 26 and to thefins 22 through the heatconductive plate 24. Thefan 12 further blows the heat on thefins 22 away, thereby achieving the heat dissipation effect. However, the produced heat forms a heat flow field (seeFIG. 3 ) within the heatconductive plate 24. This results in a worse heat conductive effect in the central area of thebase 24. Moreover, the position that generates the most heat in a typical heat-producing device is the central region. Therefore, the central area of the heatconductive plate 24 in theplanar heat sink 20 requires a better heat conducting element to enhance the dissipation effect. - To improve the heat dissipation effect in the central region of the heat
conductive plate 24, a cylindrical heat sink is proposed in the prior art. Please refer toFIGS. 4, 5 and 6.FIG. 4 shows another conventionalheat dissipating device 30.FIG. 5 is a top view of thecylindrical heat sink 40 inFIG. 4 .FIG. 6 is a side view of thecylindrical heat sink 40 along the 6-6 cross section. As shown in the drawings, theheat dissipating device 30 contains an axial-flow fan 12 (same as inFIG. 1 ) and acylindrical heat sink 40. Thecylindrical heat sink 40 is comprised of a copper or copper alloy heatconductive cylinder 44, an aluminum or aluminum alloyheat dissipating shell 46 covering over the rim of the heatconductive cylinder 44, and a plurality of aluminum or aluminum alloy fins 42 perpendicularly installed on theshell 46. Analogously, thefan 12 is embedded and fixed on thefins 42 of theheat sink 40. The other surface of theheat sink 40 is then attached onto the heat-producing device (e.g. CPU). - As the heat-producing device is in direct contact with the
heat sink surface 40, the heat released during the operation of the heat-producing device quickly flows to the heatconductive cylinder 44, theheat dissipating shell 46, and thefins 42. Through the cylindrical design, the heat flows along the heatconductive cylinder 44, theshell 46, and thefins 42 in the axial direction toward tofan 12. The fan then provides air convection to bring out the heat. - From the above description, one sees that the
cylindrical heat sink 40 indeed solves the unsatisfactory heat dissipation effect in the central region of theplanar heat sink 20. However, it is easily seen from the heat flow field inFIG. 6 that the region close to the connection interface between theheat sink 40 and thefan 12 does not have a good dissipation effect. This obviously is a waste of available space in theheat dissipating device 30. It is very unpractical to use such devices in small electronics. - Furthermore, the heat
conductive plate 24 of theheat sink 20 and the heatconductive cylinder 44 of theheat sink 40 are connected to theheat dissipating shell conductive plate 24, he heatconductive cylinder 44, and the heat sinks 26, 46 is not high enough, air gaps may appear at the connection interfaces. Besides, soldering often increases the thermal resistance of the contact interface, also affecting the heat conduction effect of theheat sinks - The invention provides an improved heat sink with a heat dissipating base that has a three-dimensional curved surface. By tight connection between the heat dissipating base and the heat dissipating shell using the disclosed connector, an optimal heat conduction effect can be achieved.
- The invention will become more fully understood from the detailed description given hereinbelow illustration only, and thus are not limitative of the present invention, and wherein:
-
FIG. 1 is the schematic view of a conventional heat dissipating device; -
FIG. 2 is a top view of the planar heat sink inFIG. 1 ; -
FIG. 3 is a side view of the planar heat sink along the cross section 3-3; -
FIG. 4 is the schematic view of another conventional heat dissipating device; -
FIG. 5 is a top view of the cylindrical heat sink inFIG. 4 ; -
FIG. 6 is a side view of the cylindrical heat sink along the cross section 6-6; -
FIG. 7 is a schematic view of the disclosed heat dissipating device; -
FIG. 8 is a top view of the heat sink in the first embodiment of the invention; -
FIG. 9 is a side view of the heat sink inFIG. 8 along the cross section 9-9; -
FIG. 10A shows the thermal resistance of the heat dissipating base as a function of the ratio of the cross section width of the bottom surface of the heat conductive block and the cross section width of the heat conductive plate in the first embodiment of the invention; -
FIG. 10B shows the thermal resistance of the heat dissipating base as a function of the ratio of the vertical height of the heat dissipating base and the vertical height between the lower surface of the heat dissipating base and the top of fins in the first embodiment; -
FIG. 10C shows the thermal resistance of the heat dissipating base as a function of the angle subtended between the bottom surface and the side surface of the heat conductive block in the first embodiment; -
FIG. 11 is a side view of the heat sink in the second embodiment along the cross section 11-11; and -
FIG. 12 is a side view of the heat sink in the third embodiment along the cross section 12-12. - The disclosed heat sink is mounted on a heat-producing device, which can be a microprocessor or a central processing unit (CPU). As shown in
FIGS. 7, 8 and 9, theheat dissipating device 50 of the invention contains an axial-flow fan 12 and a firstimproved heat sink 60. Theheat sink 60 contains aheat dissipating base 70 with a three-dimensional curved surface and a plurality ofheat dissipating fins 62. The base 70 contains a heatconductive plate 64 and a heatconductive block 66 installed at the center of thetopmost surface 61 of the heatconductive plate 64. Thefins 62 are mounted perpendicular to thetopmost surface 61 of the heatconductive plate 64 and theside surface 68 of the heatconductive block 66. Since thefins 62 are installed along theside surface 68, they have different surface areas. Thefan 12 can be fixed onto theheat sink 60 using four fixing elements (e.g. screws) on thefins 62 at the four corners. - It should be emphasized that the
heat sink 60 in the first embodiment is featured in that: the heatconductive plate 64 of theheat dissipating base 70 is installed with an approximately cylindrical heatconductive block 66 on thetop surface 61. That is, the bottom surface area of theblock 66 is greater than its topmost surface area. The heatconductive block 66 and the heatconductive plate 64 are formed together using aluminum, aluminum alloys, copper, copper alloys that have high coefficient of thermal conduction to form aheat dissipating base 70 with a three-dimensional curved surface. Thefins 62 on theheat dissipating base 70 are soldered or formed together with theheat dissipating base 70. - The shape of the heat
conductive block 66 is designed according to the heat flow field distribution inside the heat conductor and the coefficient of thermal conduction obtained in experiment. Here we only use simple texts and associated figures to describe the manufacturing and formation of the disclosed heatconductive block 66. Please refer toFIGS. 9, 10A , 10B and 10C.FIG. 10A shows the thermal resistance R of theheat dissipating base 70 as a function of the ratio d/D of the cross section width d of the bottom surface of the heatconductive block 66 and the cross section width D of the heatconductive plate 64 in the first embodiment of the invention.FIG. 10B shows the thermal resistance R of theheat dissipating base 70 as a function of the ratio h/H of the vertical height h of theheat dissipating base 70 and the vertical height H between thebottom surface 63 of theheat dissipating base 70 and the top offins 62 in the first embodiment.FIG. 10C shows the thermal resistance R of theheat dissipating base 70 as a function of the angle α subtended between thebottom surface 67 and theside surface 68 of the heatconductive block 66 in the first embodiment. Parameters that affect the design of the heatconductive block 66 include the cross section width D of the heatconductive plate 64, the cross section width d of the bottom surface of the heat conductive block, the vertical height h of the heat dissipating base 70 (the total height of the heatconductive plate 64 and the heat conductive block 66), the vertical height H from thelower surface 63 of theheat dissipating base 70 to the top of the fins 62 (the total height of the heatconductive plate 64, the heatconductive block 66, and the fins 62), the angle α between thebottom surface 67 and theside surface 68 of the heatconductive block 66, and the thermal resistance R of theheat dissipating base 70. - As shown in
FIGS. 10A, 10B , and 10C, the heatconductive block 66 in the first embodiment has the following features: (1) The cross section width d of its bottom surface is smaller than the cross section width D of the heatconductive plate 64. Theheat dissipating base 70 reaches a minimum thermal resistance, point A inFIG. 10A , when the ratio d/D approaches 0.5. (2) The vertical height h of theheat dissipating base 70 is smaller than or equal to the vertical height H from the lower surface of theheat dissipating base 70 to the top of thefins 62; that is, the height of the heat conductive block is not larger than the height of eachfin 62. When the ratio h/H is between 0.9 and 1.0, theheat dissipating base 70 has a minimum thermal resistance, point B inFIG. 10B . (3) The angle α between thelower surface 67 and theside surface 68 of the heatconductive block 66 is smaller than 90 degrees. In other words, the area of thelower surface 67 is greater than that of thetopmost surface 65. When a is between 80 degrees and 85 degrees, theheat dissipating base 70 reaches a minimum thermal resistance, point C inFIG. 10C . - When the
lower surface 67 of the heatconductive plate 64 in the first embodiment is attached to a heat-producing device (not shown), the heat produced by the device can be transferred to each of thefins 62 through the disclosed heatconductive block 66. The axial-flow fan 12 then provides air convection to bring away the heat. -
FIG. 11 is a side view of theheat sink 80 in a second embodiment of the invention along the 11-11 cross section. The biggest difference between thisheat sink 80 and theprevious one 60 is that thecurrent heat sink 80 contains aheat dissipating base 90 comprised of a heatconductive element 92 and aheat dissipating shell 94 covering over the heatconductive element 92. Theheat dissipating shell 94 and theheat dissipating base 90 are made of different metal materials. For example, the heatconductive element 92 is made of copper and theheat dissipating shell 94 is made of aluminum. Theheat dissipating fins 82 are formed together with theheat dissipating shell 94, and they are only formed on thetopmost surface 81 and theside surface 88 of theheat dissipating shell 94. Otherwise, the heatconductive element 92 is similar to theheat dissipating base 70. It also has a heatconductive plate 84 and a heatconductive block 86 formed thereon. It should be mentioned that the size, shape, composition, and property of the heatconductive plate 84 and the heatconductive block 86 in the current embodiment are similar to those in the first embodiment. The only difference is that the three-dimensional curved surface of the heatconductive element 92 is covered by the thin piece ofheat dissipating shell 94 by soldering or high-pressure mounting. Thelower surface 83 of the heat conductive element 92 (i.e. thelower surface 83 of the heat conductive plate 84) is also in direct contact with a heat-producing device. In the current embodiment, the parameters in designing the heatconductive block 86 are different from those in the first embodiment only in that the cross section width d is the width of thebottom surface 87 of the heatconductive block 86 plus the widths of theheat dissipating shell 94 on both sides. Therefore, the shape of the heatconductive block 86 is particularly designed according to the heat flow field inside the heat conductor and the coefficient of thermal conduction obtained from experiments. The experimental results in the current embodiment are also similar toFIGS. 10A, 10B , and 10C and the heat dissipation effect is the same as in the first embodiment, so we do not repeat here. - With reference to
FIG. 12 , the composition and structure of the third embodiment of theheat sink 100 are the same as those of theheat sink 80. The only difference is that: theheat sink 100 has ascrew 102 for connecting theheat dissipating shell 94 and the heatconductive block 86. Theheat dissipating shell 94 has a throughhole 104, and the heatconductive block 86 is formed with atrench 106 corresponding to and with the same diameter as the throughhole 104. Another feature of the current embodiment is that when the heatconductive element 92 and theheat dissipating shell 94 are combined together, thescrew 102 with a diameter slightly larger than those of the throughhole 104 and thetrench 106 is inserted into the throughhole 104 of theheat dissipating shell 94. Thescrew 102 is rotated into thetrench 106 on the heatconductive block 86 by hand or machine. Theheat dissipating shell 94 is then tightly connected to the heatconductive element 92 through thescrew 102. Therefore, it can avoid increase in thermal resistance due to the connection of two different metals by soldering. - It should be emphasized here that the side surface of the heat conductive block does not need to be a plane. It can be a smooth and curved surface. The fins can be made into other shapes that have larger heat dissipating areas. These modifications are still within the scope of the invention but not further described herein.
- In comparison with the prior art, a distinct characteristic of the invention is that: all the heat sinks 60, 80, 100 in the embodiments of the invention have
heat dissipating bases
Claims (21)
1. A heat sink comprising:
a heat dissipating base, which has a heat conductive plate and a heat conductive block, the heat conductive plate and the heat conductive block being separately formed, the heat conductive block having a flat top side and a flat bottom side, the flat bottom side of the heat conductive block being disposed at the top side of the heat conductive plate; and
a plurality of heat dissipating fins, installed perpendicular to the heat conductive plate and the flat top side of the heat conductive block, the heat dissipating fins being disposed on and directly connected to the heat conductive plate and the flat top side of the heat conductive block;
wherein the flat bottom side of the heat conductive block has a larger area than the flat top side of the heat conductive block.
2. The heat sink of claim 1 , wherein the plurality of fins on the heat conductive block is installed on a side surface of the heat conductive block.
3. The heat sink of claim 1 , wherein the plurality of fins, the heat conductive plate, and the heat conductive block are made by aluminum, aluminum alloys, copper, and copper alloys or a material with high coefficient of thermal conduction.
4. The heat sink of claim 1 , wherein the plurality of fins are connected to the heat dissipating base by soldering, or formed together with the heat dissipating base.
5. The heat sink of claim 1 , wherein the height of the heat conductive block is not greater than the height of the fins on the heat dissipating base.
6. The heat sink of claim 1 , wherein a side surface of the heat conductive block is a smooth curved surface, or a plane surface.
7. A heat sink, comprising:
a heat dissipating base, which has a heat conductive plate and a heat conductive block, the heat conductive plate and the heat conductive block being separately formed, the heat conductive block having a top side and a bottom side, the bottom side of the heat conductive block being disposed on a top side of the heat conductive plate; and
a plurality of heat dissipating fins disposed on and directly connected to the top side of the heat conductive plate and the top side of the heat conductive block;
wherein the bottom side of the heat conductive block has a larger area than the top side of the heat conductive block.
8. A heat dissipating device, comprising:
a fan; and
a heat sink coupled to the fan, wherein the heat sink comprises:
a heat dissipating base, which has a heat conductive plate and a heat conductive block, the heat conductive block having a top side and a bottom side, the bottom side of the heat conductive block being disposed on a top side of the heat conductive plate; and
a plurality of heat dissipating fins disposed on the top side of the heat conductive plate;
wherein the bottom side of the heat conductive block has a larger area than the top side of the heat conductive block.
9. The heat dissipating device of claim 8 , wherein the heat dissipating base further has a heat dissipating shell covering over the heat conductive plate and the heat conductive block, and the heat dissipating fins are installed to the heat dissipating shell.
10. The heat dissipating device of claim 9 , wherein the heat dissipating shell and the heat conductive block are made of different metal materials.
11. The heat dissipating device of claim 10 , wherein the heat dissipating shell is made of aluminum, and the heat conductive block is made of copper.
12. The heat dissipating device of claim 9 , wherein the heat dissipating shell and the heat conductive block are made by aluminum, aluminum alloys, copper, and copper alloys or a material with high coefficient of thermal conduction.
13. The heat dissipating device of claim 9 , wherein the heat conductive block is covered by the heat dissipating shell by soldering or high-pressure mounting.
14. The heat dissipating device of claim 9 , wherein the sink has a screw for connecting the heat dissipating shell and the heat conductive block.
15. The heat dissipating device of claim 9 , wherein the heat dissipating fins are formed together with the dissipating shell.
16. The heat dissipating device of claim 9 , wherein the heat dissipating fins are only formed on a topmost surface and a side surface of the dissipating shell.
17. The heat dissipating device of claim 8 , wherein the heat sink is used for dissipating a heat-producing device and a bottom surface of the heat conductive plate is in direct contact with the heat-producing device.
18. The heat dissipating device of claim 8 , wherein the fan is fixed onto the heat sink using a plurality of fixing elements on the fins at corners of the heat sink.
19. The heat dissipating device of claim 8 , wherein a cross section width of a bottom surface of the conductive block is smaller than a cross section width of the heat conductive plate.
20. The heat dissipating device of claim 8 , wherein a vertical height of the heat dissipating base is smaller than or equal to a vertical height from a lower surface of the heat dissipating base to a top of the fins.
21. The heat dissipating device of claim 8 , wherein an angle between the bottom side and a side surface of the conductive block is small than 90 degrees.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/515,786 US20070000643A1 (en) | 2002-07-16 | 2006-09-06 | Heat sink |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW091210818U TW540985U (en) | 2002-07-16 | 2002-07-16 | Improved heat sink |
TW91210818 | 2002-07-16 | ||
US10/339,488 US7172017B2 (en) | 2002-07-16 | 2003-01-10 | Heat sink |
US11/515,786 US20070000643A1 (en) | 2002-07-16 | 2006-09-06 | Heat sink |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/339,488 Division US7172017B2 (en) | 2002-07-16 | 2003-01-10 | Heat sink |
Publications (1)
Publication Number | Publication Date |
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US20070000643A1 true US20070000643A1 (en) | 2007-01-04 |
Family
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10/339,488 Expired - Lifetime US7172017B2 (en) | 2002-07-16 | 2003-01-10 | Heat sink |
US11/515,786 Abandoned US20070000643A1 (en) | 2002-07-16 | 2006-09-06 | Heat sink |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/339,488 Expired - Lifetime US7172017B2 (en) | 2002-07-16 | 2003-01-10 | Heat sink |
Country Status (2)
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US (2) | US7172017B2 (en) |
TW (1) | TW540985U (en) |
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US20070014089A1 (en) * | 2005-07-18 | 2007-01-18 | Jia-Lie Huang | Radiator unit for an electronic component |
US20100108292A1 (en) * | 2008-10-31 | 2010-05-06 | Teledyne Scientific & Imaging, Llc | Heat sink system with fin structure |
US20150305205A1 (en) * | 2012-12-03 | 2015-10-22 | CoolChip Technologies, Inc. | Kinetic-Heat-Sink-Cooled Server |
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US20080149305A1 (en) * | 2006-12-20 | 2008-06-26 | Te-Chung Chen | Heat Sink Structure for High Power LED Lamp |
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US9303928B2 (en) * | 2008-07-23 | 2016-04-05 | Tai-Her Yang | Thermal conduction principle and device for intercrossed structure having different thermal characteristics |
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US20150305205A1 (en) * | 2012-12-03 | 2015-10-22 | CoolChip Technologies, Inc. | Kinetic-Heat-Sink-Cooled Server |
Also Published As
Publication number | Publication date |
---|---|
JP3095778U (en) | 2003-08-15 |
US20040011508A1 (en) | 2004-01-22 |
TW540985U (en) | 2003-07-01 |
US7172017B2 (en) | 2007-02-06 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |