JP5019618B2 - heatsink - Google Patents

Description

  The present invention relates to a heat sink that is thermally connected to a heat-generating component or the like to dissipate the heat of the heat-generating component, and more particularly to a heat sink formed by laminating thin plate fin materials manufactured by processing thin plate materials.

  In recent years, electronic devices have built-in high-power, highly-integrated components such as CPUs. Various electronic components such as semiconductor elements have a very high degree of integration and perform processing such as calculation and control of information at high speed, and thus generate a large amount of heat. In addition, the number of devices that generate heat is increasing in other devices, and heat dissipation treatment is an important issue in these devices. On the other hand, the space, especially the height, that can be used to process the heat generated by the device is limited.

  Various heat sinks are used to process the heat generated by these devices. For example, there are a heat sink in which a base plate portion and a heat radiating fin portion are integrally formed by extrusion molding, a heat sink in which a separately manufactured metal base plate and a metal heat radiating fin are combined, and the like.

  In other words, a heat sink combining a separately manufactured metal base plate and metal heat dissipating fin is soldered with a plurality of thin heat dissipating fins on the other surface of the base plate to which the heat generating element is thermally connected to one surface. It is a heat sink formed by bonding with the like. In addition, there is a heat sink that inserts a thin plate fin into a groove portion of a base plate having a plurality of groove portions, mechanically caulks the peripheral portion of the groove portion, and joins the heat radiating fins to the base plate.

  Further, there is a heat radiation fin portion formed of a generally U-shaped member including a top surface portion, a bottom surface portion, and a connection portion connecting the top surface portion and the bottom surface portion, which are integrally formed of a member excellent in heat dissipation. A heat generating element or the like is thermally connected to the bottom surface of the radiating fin. Furthermore, a heat sink is known in which a plurality of the heat radiating portions thus formed are connected in parallel by, for example, a claw portion and a claw receiving portion, and the bottom surface portion forms a flat heat receiving surface as a whole.

  A method of cooling a heat generating element is widely known by combining a heat sink as described above and a fan for forced cooling, and blowing cool air between radiating fins to which heat of the heat generating element is transmitted. Further, when the heat generating element and the heat radiating fin are separated from each other, the heat generating element and the heat radiating fin are thermally connected by the heat pipe, and the heat of the heat generating element is disposed at another position by the heat pipe. It is also known to move to the radiating fin and cool by a cooling fan.

Furthermore, as an effective heat radiating device, a heat sink with a centrifugal fan that cools a heat generating element by attaching a centrifugal fan to a housing having an air intake port and an air discharge port is known. In a heat sink with a centrifugal fan, a plurality of radiating fins are usually stacked at a predetermined interval in a direction perpendicular to the rotation axis of the fan. The heat sink with a centrifugal fan blows the air taken in from the air intake port to the surroundings by rotating the centrifugal fan, and is guided directly to the wall surface of the housing or through the radiating fins arranged near the air exhaust port. Is discharged out of the housing. A heat pipe is thermally connected to the radiating fin to move the heat of the heating element, and the heat of the heating element moved to the radiating fin is dissipated by the air blown by the above-described fan.
JP 2005-38985 A JP 2005-321287 A

  A space for installing a heat sink for processing the heat of the heating element is limited. Especially when it is built in a thin personal computer or the like, the space for installing the heat sink becomes more restrictive. Even when a heat sink with a centrifugal fan is used, the wind generated by the fan may be radiated in various directions, and it is hoped that the cooling performance of the heat sink will be realized efficiently without hindering the flow of the wind. It was rare. In addition, it has been desired to improve the performance and quietness of the heat sink in a limited installation space. Especially when built into a thin personal computer or the like, in the case of a heat sink with a centrifugal fan, in order to conduct heat between the radiation fins stacked at a predetermined interval in the direction perpendicular to the rotation axis, embossing is performed on a part of the radiation fins , Burring, drawing, and the like were joined to conduct heat conduction between the radiating fins.

  Thus, when embossing etc. are applied to the radiation fins and they are joined, the heat conduction from the lowest radiation fin to the uppermost radiation fin of the laminated radiation fins goes through several layers of radiation fins, Heat transfer was not performed smoothly. Although there is a method of conducting heat conduction between the laminated radiating fins using a shaft of a separate part, the manufacturing cost becomes high, and time labor is also required for assembly. Furthermore, the movement of air between the laminated heat dissipating fins is limited, and effective heat dissipation is hindered.

  Therefore, an object of the present invention is to directly connect the heat radiation fins laminated at predetermined intervals to the uppermost heat radiation fin or the heat pipe connected to the uppermost heat radiation fin, and between the heat radiation fins. An object of the present invention is to provide a heat sink that is capable of air flow and has excellent thermal efficiency.

  The inventor conducted extensive research to solve the conventional problems. As a result, an appropriate location of the fin of the single plate is cut and raised in an approximately L shape, so that the horizontal portion of the L-shaped tip can be directly joined to the fin to be thermally conducted, and further, it is located in the lower layer. The fin cut-and-raised portion passes through the opening formed in the fin cut-and-raised portion located in the upper layer, and when a plurality of fins are laminated so as to be bonded to the fin that wants to conduct heat, It has been found that any of the fins made can be directly joined to the fin that is to be thermally conducted.

Further, it has been found that wind can flow between the fins stacked by the cut and raised portions, and the heat dissipation efficiency is improved.
Furthermore, it was found that by setting the direction of the part to be cut appropriately, the flow of the wind sent by the centrifugal fan is inhibited as much as possible, and it can be used as a heat radiating part. did.

A first aspect of the heat sink according to the present invention includes a substantially L-shaped cut-and-raised portion composed of a vertical portion and a horizontal portion formed by cutting and bending a predetermined portion, and an opening formed by the cut-and-raised portion. A plurality of thin plate-like bodies provided are formed by laminating the horizontal portion thermally connected to another thin plate-like body, and the L-shaped cut and raised portion of the thin plate-like body is another thin plate-like body A heat sink , wherein the horizontal portion is thermally connected to a predetermined thin plate-like body through the opening formed in the body .

A second aspect of the heat sink of the present invention is the heat sink according to the first aspect of the heat sink of the present invention described above, wherein the height of the vertical portion of the L-shaped cut-and-raised portion is different.

According to a third aspect of the heat sink of the present invention, in the first or second aspect of the heat sink of the present invention described above, the heat sink includes a substantially circular opening formed in a part of the thin plate-like body, and the plurality of sheets This is a heat sink in which a centrifugal fan is accommodated in a cylindrical cavity formed by laminating thin plate-like members.

According to a fourth aspect of the heat sink of the present invention, in the third aspect of the heat sink of the present invention described above, the L-shaped cut-and-raised portion is arranged to guide the wind of the centrifugal fan in a desired direction. The heat sink.

According to a fifth aspect of the heat sink of the present invention, in any one of the first to fourth aspects of the heat sink of the present invention described above , the heat pipe is heated on the thin plate-like body at the top of the laminated thin plate-like bodies. The L-shaped cut-and-raised portion of each of the thin plate-like members that are joined and stacked together is thermally connected to the uppermost thin plate-like member via the horizontal portion.

According to a sixth aspect of the heat sink of the present invention, in the fifth aspect of the heat sink of the present invention described above, a portion of the heat pipe protrudes outward from the thin plate-like body, so that the space portion is formed, the upper and lower surfaces of a portion of the heat pipe that is disposed to form the space portion, wherein the heat pipe to flow air for cooling is arranged, a heat sink.

According to a seventh aspect of the heat sink of the present invention, in the fifth or sixth aspect of the heat sink of the present invention described above , another cut is formed in the uppermost thin plate-like body, the cut portion is bent, and one sheet is formed. It is a heat sink which is fixing so that the said heat pipe may be pinched | interposed by the part of the thin plate-shaped body.
An eighth aspect of the heat sink of the present invention is the heat sink according to any one of the first to seventh aspects of the present invention described above, wherein the thin plate-like body is made of a single plate and is guided by the L-shaped cut and raised portion. An end portion of the laminated thin plate-like body from which the released air is discharged functions as a heat sink.
According to a ninth aspect of the heat sink of the present invention, in any one of the first to eighth aspects of the heat sink of the present invention described above, a heat dissipating fin portion is provided at an end portion of the laminated thin plate-like body, An L-shaped cut-and-raised part is a heat sink arranged to guide the wind of the centrifugal fan to the heat radiating fin part.

  According to the present invention, an appropriate portion of a single-plate fin is cut and raised in an approximately L shape, and the horizontal portion of the L-shaped tip is directly joined to the fin to be thermally conducted, and further, the fin located below the fin. The cut-and-raised part of the laminate penetrates through the opening formed in the raised-and-raised part of the fin located in the upper layer, and a plurality of fins are laminated so as to be joined to the fin that wants to conduct heat thereon. Any fin that has been made can be directly joined to the fin that is to conduct heat.

Furthermore, according to the present invention, wind can flow between the fins laminated by the cut-and-raised portion, and the heat dissipation efficiency can be improved. Furthermore, according to the present invention, by appropriately setting the direction of the part to be cut and raised, the flow of the wind sent by the centrifugal fan is suppressed as much as possible to guide and use itself as a heat radiating part. be able to.
Furthermore, as described above, since the wind flow is inhibited from being inhibited as much as possible, the performance of the heat sink can be improved and the silence can be improved.

Embodiments of the heat sink of the present invention will be described in detail with reference to the drawings.
A first aspect of the heat sink according to the present invention includes a substantially L-shaped cut-and-raised portion composed of a vertical portion and a horizontal portion formed by cutting and bending a predetermined portion, and an opening formed by the cut-and-raised portion. It is a heat sink formed by laminating a plurality of thin plate-like bodies provided so that the horizontal portion is thermally connected to another thin plate-like body.
The thin plate-like body is made of a thin plate material, for example, a metal thin plate material having high workability such as copper, aluminum, aluminum alloy having excellent thermal conductivity.

  FIG. 1 is a perspective view showing one example of a thin plate member provided with a cut-and-raised portion and an opening formed by the cut-and-raised portion. As shown in FIG. 1, the thin plate material 2 is made of a single plate, and is made of a thin plate material that is partially processed. That is, a substantially L-shaped cut-and-raised portion 11 composed of a vertical portion 12 and a horizontal portion 13 formed by cutting a predetermined portion of the thin plate material 2 and bending the cut-out portion, and an opening generated by the cutting and raising. 10 is provided. The incision is performed, for example, by making incisions into three pieces in a U-shape. Thus, since the thin plate material 2 is rich in workability, various processing is possible according to the situation.

  The cut-and-raised portion 11 has a vertical portion 12 that defines the height between the thin plate materials when a plurality of processed thin plate materials 2 are stacked, and the horizontal portion 13 is joined to the other thin plate materials 2 to generate heat. Connected. Thus, the cut-and-raised portion 11 has a function of performing heat conduction between the thin plate members 2. Further, the vertical portion 12 of the cut-and-raised portion 11 is disposed at a predetermined position as a wall surface and functions as a guide portion that guides the cooling air passing between the plurality of laminated thin plate members 2 in a desired direction. An example of the flow of wind generated by the centrifugal fan is indicated by arrows. As indicated by arrows in FIG. 1, the vertical portions 12 of the plurality of raised portions 11 arranged at predetermined positions serve as wall surfaces to restrict the flow of the wind, and the wind generated by the centrifugal fan is guided in a desired direction. Is done.

  Thus, the shape and size of the cut-and-raised portion 11 can be variously set according to the heat conduction by the connection with the other thin plate member 2 and the induction direction of the cooling air. Thin plate materials with excellent workability can be used in various situations and are extremely flexible. The opening 10 generated by cutting and raising facilitates the movement of the cooling air between the laminated thin plates 2, and the opening 10 is used to change the desired thin plate 2 to another thin plate 2. The vertical portion 12 of the cut and raised portion 11 can be communicated.

  For example, the vertical portion 12 of the cut-and-raised portion 11 of the lowermost thin plate member 2 is formed long and penetrates the opening 10 generated by the cut-and-raised portion of the other thin plate member 2 to the back surface of the uppermost thin plate member 2. The horizontal part 13 is thermally connected and joined. In this way, thermal communication with the desired thin plate material 2 is possible, and heat can be conducted to the desired thin plate material 2. In addition, the shape of the thin plate material 2 can be appropriately set depending on the location of the centrifugal fan, the space that can be used as a heat sink, and the like.

  FIG. 2 is a diagram illustrating a state in which a plurality of processed thin plate materials are stacked. FIG. 2 shows a state in which four processed thin plate materials are stacked. The state which looked at the laminated sheet material from diagonally downward is shown. As shown in the thin plate material 2-4 positioned at the bottom of the four laminated thin plate materials 2-1, 2-2, 2-3, 2-4, a plurality of each formed by cutting and raising in a desired direction The cut-and-raised part 11 is provided.

  The cut-and-raised part 11 is formed in a substantially L-shape consisting of a vertical part 12 and a horizontal part 13 by cutting and raising the three sides of the rectangle and bending the tip part in the horizontal direction. The horizontal portion 13 of the cut-and-raised portion 11 is formed on a flat surface in order to facilitate thermal connection with other thin plate materials. A plurality of openings 10 generated by cutting and raising are provided in the thin plate member 2.

  In this aspect, the height of the cut-and-raised portion of the thin plate material 2-4 (the height of the vertical portion) is substantially the same. Similarly, the remaining three thin plate members 2-1, 2-2, and 2-3 are formed with cut-and-raised portions 11 each having a vertical portion 12 and a horizontal portion 13 having a size corresponding to a substantially corresponding position. Has been. A flat heat pipe 4 is joined and thermally connected to the surface of the uppermost thin plate member 2 so as to surround the peripheral portion of the thin plate member 2. The thin plate materials 2-1, 2-2, 2-3, and 2-4 processed in this way are thermally applied to the back surface of the adjacent thin plate material 2 in which the horizontal portions 13 of the cut and raised portions 11 are laminated. Connected to. The vertical portion 12 of the cut-and-raised portion 11 is positioned like a wall surface, and its direction is set so as to regulate and guide the flow of cooling air from the centrifugal fan in a desired direction. In addition, the vertical part of the cut-and-raised part itself functions as a heat radiating member.

  When the above-described four processed thin plate members 2 are laminated, the thin plate member 2 is joined at the horizontal portion 13 of the cut-and-raised portion 11, so that heat conduction is performed between the laminated thin plate members 2. Furthermore, the cooling air can communicate with each other between the lowermost plate and the uppermost thin plate material through the opening 10 generated by cutting and raising. In this way, heat of the heat pipe transmitted to the uppermost thin plate member 2 is conducted to the other thin plate members 2 and is moved toward the heat radiating units 8 and 14 by the centrifugal fan.

  The height of the vertical portion 12 of the cut and raised portion 11 can be set as appropriate. FIG. 3 is a partially enlarged view illustrating a state in which the cut and raised portions 11 having the vertical portions 12 having different heights are combined. As shown in FIG. 3, the height of the vertical portion 12 of the cut and raised portion 11 is changed between the thin plate members 2. The lowermost thin plate member 2 includes a cut-and-raised portion 11 including a vertical portion 12-3 and a horizontal portion 13-3. The second thin plate member 2 from the bottom includes a cut-and-raised portion 11 including a vertical portion 12-2 and a horizontal portion 13-2.

  As shown in FIG. 3, for example, the cut-and-raised portion 11 of the thin plate material 2-3 on the lower side is set so that the vertical portion 12-3 is long (high), and the opening 10 of the thin plate material 2-2 is set. It penetrates and the horizontal part 13-3 of the cut-and-raised part 11 is joined and thermally connected to the back surface of the thin plate material 2-1. Thus, the height of the vertical portion 12 can be changed according to the situation such as the size of the gap between the thin plates. For example, heat in which the vertical portion 12 of the thin plate member 2 located at the lower part of the four laminated thin plate members 2 is directly joined to the uppermost thin plate member 2 and is thermally connected to the uppermost thin plate member 2. The heat of the pipe 4 can be directly moved to the lowermost thin plate member 2 through the cut-and-raised portion 11 to increase the cooling efficiency. When joining one cut-and-raised part through the opening of another thin plate material and joining it to the back surface of the thin plate material, the position of the cut-and-raised part overlaps, so the horizontal part of the cut and raised part may overlap, The bending direction of the horizontal portion may be changed so as to avoid overlapping.

FIG. 4 is a perspective view for explaining one embodiment of the heat sink of the present invention. The heat sink according to the present invention includes the thin plate materials described above and a centrifugal fan at the center.
In order to limit the overall height, a flat heat pipe can be used as the heat pipe thermally connected to the uppermost thin plate material.

  As shown in FIG. 4, the thin heat sink 1 is formed by laminating processed thin plate materials 2 so that the air can be easily taken into the intake port of the centrifugal fan even when the height is limited. Is arranged. That is, the thin heat sink 1 is attached to the laminated thin plate material 2, the flat heat pipe 4 joined with a space portion at the top of the laminated thin plate material, and the end of the laminated thin plate material. The heat radiating fins 8 and the heat radiating fins 14 using the end portions of the laminated thin plate members are provided.

  The plurality of thin plate members 2 having a predetermined shape are provided with a circular opening for accommodating a centrifugal fan (not shown) at a substantially central portion. The thin plate materials are stacked with a predetermined gap, and a cylindrical hollow portion for accommodating the centrifugal fan is formed by a circular opening. The laminated thin plate materials form a part of a case that houses the centrifugal fan. The laminated thin plate material includes an air guiding portion formed by processing.

  The heat radiating fin portion 8 is connected to the end portion of the thin plate member 2, and the air guided to the air guiding portion of the thin plate member 2 passes through it. The flat heat pipe 4 has one end portion 5 thermally connected to a portion of a thin plate material that is thermally connected to a heat-generating component, and the other end portion 6 uses a heat radiating fin utilizing the end portion of the thin plate material. A space portion 7 is provided between the thin plate member 2 and the thin plate member 2. In a heat sink with a centrifugal fan, the entire surface is usually joined to the end of the thin plate material so as to surround the air inlet at the top of the laminated thin plate material.

  In the thin heat sink of the present invention, as described above, the thin heat sink is disposed so as to protrude to the outside of the laminated thin plate material, thereby facilitating the flow of air to the air inlet to the centrifugal fan. A plurality of heat pipes are used corresponding to the number of radiating fin portions. In the embodiment shown in FIG. 4, two flat heat pipes are used and attached along the entire circumference of the laminated thin plate materials.

This will be described in more detail with reference to FIG.
As shown in FIG. 4, the flat heat pipe 4 is joined and thermally connected to the surface of the uppermost thin plate member 2-1 of the thin plate members 2 stacked in this way. In the aspect shown in FIG. 4, two flat heat pipes 4-1 and 4-2 are arranged. The heat pipes 4-1 and 4-2 are thermally formed by joining one end portion 5-1 and 5-2 as a heat absorbing portion to the portion of the thin plate material 2-1 to which the heat generating component is thermally connected. Connected. As shown in FIG. 4, each of the heat pipes 4-1 and 4-2 is disposed with a space portion 7 between the laminated thin plate members 2.

  In other words, the heat pipes 4-1 and 4-2 are arranged in the same plane and are arranged so as to protrude outside the thin plate material 2, which is partially laminated. 7 are formed. Conventionally, the entire upper surface of the thin plate material was joined and thermally connected so as to surround the intake port, but if the height is limited, the air flow to the intake port of the centrifugal fan is restricted. Ingestion becomes difficult.

  In order to solve this problem, in the present invention, the heat pipes 4-1 and 4-2 are not joined to the thin plate material 2-1 over the entire surface so as to surround the air inlet 3, but as described above, A part of the heat pipes 4-1 and 4-2 is arranged so as to protrude to the outside of the thin plate material 2 on the same surface, and a space 7 is formed between the heat pipes 4-1 and 4-2. Thus, when a part of the heat pipes 4-1 and 4-2 is projected to the outside of the thin plate material 2 on the same surface, the thickness of the entire heat sink 1 does not change, and the flow of air to the intake port 3 is increased. can do.

  As a result, when the centrifugal fan is rotated, the cold air passes through both the upper and lower surfaces of the heat pipes 4-1 and 4-2 that protrude outward and form the space 7 between the thin plate member 2. Flows toward the air inlet 3. Accordingly, a part of the heat pipes 4-1 and 4-2 can be cooled by the cold air flowing to the intake port 3. Further, when another radiating fin portion (not shown) is connected to the portion of the heat pipes 4-1 and 4-2 protruding outward and forming the space portion 7 between the thin plate member 2, The heat pipes 4-1 and 4-2 are cooled by the cold air flowing toward the air, and the cooling efficiency is further increased.

  The heat pipes 4-1 and 4-2 protrude outward and form a space 7 between the thin plate member 2 and then return to the uppermost surface of the thin plate member 2 and are joined to the radiation fin portions 8 and 14. Connected thermally. For example, the uppermost part 9 of the laminated thin plate members 2 may be bent to sandwich the heat pipes 4-1 and 4-2 from both sides. By doing so, the heat radiating portion 6 of the heat pipe 4 is joined and thermally connected to the end of the thin plate material by the processed thin plate material 2.

  In one aspect of the heat pipe of the present invention, two types of heat radiation fin portions 8 and 14 are provided. One radiating fin portion 8 is a first radiating fin portion made of a plurality of thin plate members attached to the end portion of the processed thin plate material 2. The fins of the first heat radiating fin portion 8 are arranged parallel to the axial direction of the centrifugal fan (that is, in the vertical direction). For example, the first radiating fin portion 8 includes a plurality of plate-like plates each having a substantially U-shaped cross section including a bottom surface, a vertical surface, and an upper surface, and the vertical surface is disposed in parallel with the axial direction of the centrifugal fan. Yes.

  A plurality of fins are arranged in parallel on the top and bottom surfaces to form a flat surface. For example, as shown in FIG. 4, one surface forms a heat receiving surface, and is joined and thermally connected to the lower surfaces of the heat pipes 4-1 and 4-2. The first radiating fin portions 8-1 and 8-2 are, for example, a wind guided through the laminated thin plate members 2 approximately on the vertical surfaces of the first radiating fin portions 8-1 and 8-2. Located in the corners of the heat sink, flowing in parallel. As shown in FIG. 4, the first radiating fin portions 8-1 and 8-2 can be arranged in the same number as the number of the heat pipes 4-1 and 4-2.

  In the other radiating fin portion, the end of the laminated thin plate material 2 forms the second radiating fin portion 14. That is, as shown in FIG. 4, the thin plate material portions 14-1 and 14-where the heat radiation portions 6-1 and 6-2 of the flat heat pipes 4-1 and 4-2 are joined and thermally connected. 2 are arranged in parallel in a direction perpendicular to the axial direction of the centrifugal fan (that is, in the horizontal direction).

  This portion is guided to the laminated thin plate material 2 by the vertical portion 12 of the cut and raised portion 11 formed by processing, and wind (including curved wind) flowing in an oblique direction passes through the exhaust port. As described above, by providing a plurality of types of heat radiation fins 8 and 14 having a shape corresponding to the wind flow of the centrifugal fan, the flow of wind flowing between the laminated thin plate materials becomes smooth, and the heat dissipation effect is improved. Can be increased.

  In addition, the substantially circular opening formed in a part of thin plate material is provided, and the centrifugal fan is accommodated in the cylindrical hollow part formed by laminating | stacking several thin plate materials.

  According to this invention, even if a heat pipe is disposed so as to surround the air intake port, it is possible to provide a thin heat sink that can be easily sucked by the centrifugal fan and has excellent cooling efficiency.

FIG. 1 is a perspective view showing one example of a thin plate member provided with a cut-and-raised portion and an opening formed by the cut-and-raised portion. FIG. 2 is a diagram illustrating a state in which a plurality of processed thin plate materials are stacked. FIG. 3 is a partially enlarged view illustrating a state in which the cut and raised portions 11 having the vertical portions 12 having different heights are combined. FIG. 4 is a perspective view for explaining one embodiment of the thin heat sink of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat sink 2 Thin plate material 3 Cavity part, inlet port 4 Heat pipe 5 Heat absorption part 6 of heat pipe Heat radiation part 7 Space part 8 Radiation fin part 9 Bent part 10 of thin sheet material Opening part 11 Cut and raised part 12 Vertical portion 13 Horizontal portion 14 Second radiation fin portion

Claims (9)

A plurality of thin plate-like bodies each provided with an approximately L-shaped cut-and-raised portion composed of a vertical portion and a horizontal portion formed by cutting and bending a predetermined portion, and an opening formed by the cut-and-raised portion, The horizontal part is formed by being thermally connected to another thin plate-like body ,
The L-shaped cut-and-raised portion of the thin plate member passes through the opening formed in another thin plate member, and the horizontal portion is thermally connected to the predetermined thin plate member. Features heat sink. The heat sink according to claim 1, wherein heights of vertical portions of the L-shaped cut and raised portions are different . A substantially circular opening formed in a part of the thin plate-like body is provided, and a centrifugal fan is accommodated in a cylindrical cavity formed by stacking the plurality of thin plate-like bodies. The heat sink according to claim 1 or 2 . The heat sink according to claim 3 , wherein the L-shaped cut-and-raised portion is arranged to guide the wind of the centrifugal fan in a desired direction . A heat pipe is thermally joined to the uppermost thin plate-like body of the laminated thin plate-like bodies, and the L-shaped cut-and-raised portion of each of the laminated thin plate-like bodies is disposed through the horizontal portion. The heat sink according to any one of claims 1 to 4, wherein the heat sink is thermally connected to the uppermost thin plate-like body . A space portion is formed between the heat pipe and a portion of the thin plate-like body that protrudes outward from the thin plate-like body, and an upper surface of the portion of the heat pipe that is disposed to form the space portion. The heat sink according to claim 5 , wherein the heat pipe is arranged so that cooling air flows through the lower surface and the lower surface . 7. The uppermost thin plate-like body is formed with another cut, and the cut portion is bent and fixed so that the heat pipe is sandwiched by one thin plate-like body portion. Heat sink. The thin plate-like body is made of a single plate material, and air guided by the L-shaped cut-and-raised portion is released, and an end portion of the laminated thin-plate bodies functions as a heat radiating portion. The heat sink according to any one of 7. The heat sink fin part is provided in the edge part of the laminated | stacked said thin-plate-like body, The said L-shaped cut-and-raised part is arrange | positioned so that the wind of a centrifugal fan may be guide | induced to the said heat sink fin part. The heat sink according to any one of 8.

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