JP2004134696A - Cooling device and heat sink used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small cooling device of high performance which can easily fix a fan and a heat sink to each other. <P>SOLUTION: The cooling device 1 is provided with a heat sink 2 having a plurality of sheet-like fins 21 arranged in a thickness direction and a base 22 connecting lower ends of the fins and with a fan 3 having a blade sending wind to the heat sink 2 with rotation and a housing 8 holding the blade so that it can rotate. The cooling device is characterized in that the fan 3 has one pair or a plurality of pairs of legs 8d extending downward from both ends in the thickness direction or a face direction of the fins 21 in the housing 8, and the heat sink 2 has parts engaged with the respective legs 8d for a plurality of the adjacent fins 21. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooling device and a heat sink used therein, and particularly to a cooling device suitably used for cooling a CPU of a personal computer.
[0002]
[Prior art]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2000-341909 Certain types of electronic components, such as CPUs, generate heat during use, and when the temperature becomes abnormally high, the operation is hindered. A conventional cooling device for a CPU includes, for example, a heat sink H including a group of a plurality of plate-like fins 121 and a rectangular base 122 connecting lower end portions of the fins 121 as shown in a vertical sectional view in FIG. And a fan H provided on the heat sink H. An electronic component is disposed in contact with the lower surface of the heat sink H. The heat of the electronic component is absorbed by the heat sink H and the fan F blows the heat. The heat of H is radiated. The heat sink H is integrally formed of a material having good thermal conductivity (for example, aluminum) (for example, Patent Document 1).
The fan F includes a rotating member and a stationary member that rotatably holds the rotating member via bearing means. The rotating member generally has one rotating shaft R at the center, a plurality of blades B arranged around the rotating shaft R, and a driving magnet M provided inside the blades. The stationary member usually connects a cylindrical bearing holder 18a concentric with the rotation axis R, a plurality of ribs 18b extending horizontally from the upper end of the bearing holder 18a to each surface, and connects the tips of the ribs 18b on each side to each other and takes in the blade B. The housing 18 includes a frame 18c and four legs 18d extending downward from four corners of the frame 18c. A hook P protruding in a claw shape is formed at a lower end of the leg 18d. The housing 18 is integrally formed of a synthetic resin. The bearing K is fixed to the outer peripheral surface of the rotating shaft R and the inner peripheral surface of the bearing holder 18a. The stator S is fixed to the outer peripheral surface of the holder 18a. The blade B is formed so as to be inclined with respect to the rotation axis R such that the wind goes downward along the rotation axis R when rotating.
[0003]
The fixing of the fan F to the heat sink H is often performed by the hook P being elastically deformed and hooked on the step D at the tip of the fin 121 at each end of the heat sink H. The fan F and the heat sink H are firmly integrated so that the fan F does not vibrate or separate from the heat sink H due to the wind pressure generated by the rotating fan F.
In this case, the hook P of the fan F may be integrated with the base 122 of the heat sink H so as to be hooked, but it is difficult to maintain the molding accuracy of the housing 18 because the length of the leg 18c is correspondingly long. In addition, since the housing 18 is made of a resin that is easily warped with respect to the metal heat sink H, the possibility of the housing 18 being warped and bent is increased. Therefore, by shortening the length of the leg 18c as much as possible, the stress acting on the base 122 is small and the warp is less likely to occur, and the molding accuracy of the housing 18 can be maintained. Therefore, it may be preferable to form a step D or a concave portion shown in the fins 121 at both ends of the group of fins 121 so as to engage with the hook P on the heat sink H side.
By the way, the amount of heat generated by electronic components is increasing with the improvement of the performance of personal computers, and high cooling performance is required for cooling devices. Further, as users are demanding further miniaturization of personal computers, a cooling device, which is one of the components, must be further miniaturized. A simple way to increase the performance while reducing the size of the cooling device in response to such a demand is to increase the surface area of the entire heat sink by reducing the thickness of each fin and increasing the number of fins.
[0004]
[Problems to be solved by the invention]
However, since the rigidity of the fin decreases as the fin becomes thinner, the fin to be engaged when the hook is hooked is bent and a predetermined engagement structure cannot be obtained.
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cooling device which is small in size, has high performance, and can easily fix the fan and the heat sink to each other.
[0005]
[Means for Solving the Problems]
In order to solve the problem, the cooling device of the present invention is:
A heat sink having a plurality of plate-shaped fins arranged in the thickness direction and a base connecting the lower ends of the fins, a fan for sending wind to the heat sink with rotation, and a fan having a housing for rotatably holding the blades. In the cooling device provided,
The fan has one or more pairs of legs extending downward from both ends in the thickness direction or the surface direction of the fin of the housing,
The heat sink has a portion where each of the legs engages over a plurality of adjacent fins.
[0006]
According to the configuration of the cooling device of the present invention, since the heat sink has a portion that extends over a plurality of fins with respect to one leg, the stress acting on the fin from the leg is dispersed to the plurality of fin groups, and The stress applied to the fins per contact is reduced to one part of the number of fins. Therefore, even if the fins are thinned, they can be reliably engaged with the hooks without bending. In addition, since the fins are thin, the number of fins can be increased to increase the surface area of the entire heat sink, thereby improving the cooling performance. Alternatively, since the fins are thin, the external dimensions of the entire heat sink can be reduced, and as a result, the entire cooling device can be reduced in size.
[0007]
One preferable cooling device of the present invention is such that a hook protruding in a direction substantially orthogonal to the fin is formed at a lower end of the leg, and the engaging portion is formed in a through hole formed between the adjacent fins to receive the hook. It is assumed that. With this configuration, it is possible to determine and fix the position of the fan in the vertical direction, that is, the axial direction, with respect to the heat sink simply by inserting the hook into the through hole.
Another preferred cooling device according to the present invention is such that a hook protruding in the surface direction of the fin is formed at a lower end of the leg, and the engaging portion is formed at a position lower than the upper end of the adjacent fin so as to complement the lower end of the leg. It is a cut-out notch. With this configuration, the hook elastically deforms upward while the leg is inserted into the notch from above the heat sink, and when the lower end of the leg reaches the bottom of the notch, the hook returns to its standard shape by elastic restoring force and easily. Because it gets caught.
In still another preferred cooling device of the present invention, a hook protruding in the surface direction of the fin is formed inside the lower end of the leg, and the engaging portion is formed on both sides of the adjacent fin so as to be hooked with the hook. Step. With this configuration, the hooks are easily hooked on the steps due to the elastic restoring force of the two legs simply by sandwiching the fin from both sides by elastically deforming the legs in a slightly expanding direction.
[0008]
Therefore, a heat sink suitable for the cooling device of the present invention is a heat sink used in combination with a fan, and in a heat sink having a plurality of plate-like fins arranged in a thickness direction and a base connecting lower ends of the fins,
In order to fix the fan to the fan, as a portion where the hook of the fan engages with the fin, two or more fins adjacent to each other among the plurality of fins have concentric through holes, hook-shaped cuts cut from the upper end. It is characterized in that either a notch or a step is formed on both sides.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
-Embodiment 1-
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a cooling device according to the first embodiment, and FIG. 2 is a perspective view showing a state where a fan and a heat sink of the cooling device are separated.
The cooling device 1 includes a heat sink 2 and a fan 3 provided thereon. As shown in FIG. 2, the heat sink 2 is composed of a group of a large number of substantially rectangular plate-like fins 21 and a base 22 having a rectangular shape in plan view that connects the lower ends of the fins 21 to each other. It is manufactured in. The thickness of the fins 21 is smaller than that of the conventional heat sink shown in FIG. Nevertheless, the overall dimensions of the heat sink 2 are the same as in the prior art. In the fins 21 at both ends of the group of fins 21 and the fins 21 adjacent thereto, circular through holes 23 are formed near both ends in the surface direction, and the fins 21 penetrate through the two fins 21 inside each one. A second through-hole 24 concentric with the hole 23 is formed (that is, the through-holes 23 and 24 are formed over a plurality of adjacent fins 21). These through holes 23 and 24 are formed by a drill or the like after the extrusion molding. The shape of the through holes 23 and 24 is not limited to a circle as long as it can engage with a hook described later.
[0010]
The fan 3 includes a rotating member and a stationary member which rotatably holds the rotating member via bearing means. The rotating member usually has one rotating shaft 4 in the center, a bowl-shaped bracket 5 fixed to the lower end thereof, a driving magnet 6 arranged circumferentially on the inner circumferential surface of the bracket 5, and a rotating shaft on the outer circumferential surface of the bracket 5. It has an impeller 7 fixed concentrically with the shaft 4. The impeller 7 includes a cylindrical boss 7a and a plurality of blades 7b extending in a radial direction from the outer peripheral surface of the boss 7a. Each of the blades 7b rotates so as to send wind downward in the vertical direction of the rotary shaft 4 with the rotation. It is formed inclined with respect to the axis. On the other hand, the stationary member usually has a housing 8, a stator 9, and a drive circuit (not shown). The housing 8 includes a cylindrical bearing holder 8a arranged concentrically with the rotating shaft 4, a plurality of ribs 8b extending from the flange at the upper end of the bearing holder 8a horizontally to the respective surfaces, and connecting the tips of the ribs 8b to each other. And a leg 8d extending downward from four corners of the frame 8c. A stator 9 is fixed to the outer peripheral surface of the holder 8a so as to face the driving magnet 6. The stator 9 is electrically connected to a drive circuit. The rotating member and the stationary member are joined by fixing the inner ring of the bearing 10 to the outer peripheral surface of the rotating shaft 4 and fixing the outer ring of the bearing 10 to the inner peripheral surface of the holder 8a.
[0011]
The housing 8, particularly the legs 8d, will be described in detail. The housing 8 has a holder 8a, ribs 8b, frame 8c, and legs 8d integrally formed of resin, and has a rectangular shape in plan view substantially overlapping the shape of the heat sink 2 in plan view. The space between the ribs 8b serves as an intake port for taking air into the frame 8c. Each of the legs 8d is formed in a long plate shape in the vicinity of each of the four corners, and extends downward in the vertical direction (same as the vertical direction of the rotary shaft 4) so as to face two fins 21 with all the fins 21 therebetween. Reaches a little lower than the through hole 23. The distance between the legs 8d opposed in the thickness direction of the fins 21 is somewhat smaller than the distance in the thickness direction between the fins 21 at both ends. A cylindrical hook 11 protruding horizontally and inward is formed on the inner surface of the lower end of each leg 8d facing the through hole 23, and the hook 11 projects to the extent that the hook 11 can be inserted into the through holes 23 and 24 in the assembled state. . The hook 11 has a tapered shape having a claw-shaped portion having a diameter larger than that of the columnar portion at the tip, and is divided into two by an axial groove 11a at the earliest. The cylindrical portion of the hook 11 is substantially the same as the hole diameter of the through holes 23 and 24, and the outer diameter of the claw portion is larger than the hole diameter. However, the outer diameter when the claw portion is reduced in diameter by the groove 11a is the same as the hole diameter. Is the same as Therefore, when the hook 11 is fitted into the through holes 23 and 24, the groove 11a is narrowed and elastically deforms in a direction in which the outer diameter is reduced, and when the hook 11 passes through the through hole 23 (or 24), the original force is restored by the restoring force. The hook 11 is hooked on the inner surface of the through hole 24 to prevent the hook 11 from coming off. At this time, since the main body of the leg 8d is in close contact with the outer side surfaces of the fins 21 at both ends, the two adjacent fins 21 are firmly sandwiched between the main body of the leg 8d and the claw-shaped portion of the hook 11. Have been. As described above, one leg 8d is engaged with a plurality of adjacent fins 21, and the engaged portions are formed at the four corners of the housing 8, whereby the fan 3 is fixed to the heat sink 2.
The length of the frame 8c in the up-down direction is such that the rotation member in the housing 8 is fixed to the fins 21 with the fan 3 fixed to the heat sink 2 by inserting the hooks 11 of the legs 8d into the through holes 23 and 24. Is designed so that it is located above the upper end with a sufficient gap 12.
[0012]
The cooling device 1 is mounted on an electronic component such as a CPU (not shown) so that the base 22 is in contact with the electronic component. The cooling device 1 absorbs heat generated during operation of the electronic component from the base 22 and emits the air between the fins 21. . During the operation of the electronic components, the drive circuit of the cooling device 1 is also activated, and the impeller 7 rotates to take in air from the outside and blow air toward the fins 21. As a result, the air between the fins 21 is constantly exchanged to keep the fins 21 and the base 22 cool, thereby facilitating the absorption of heat from the electronic components.
[0013]
According to the cooling device 1, one leg 8 d is engaged with two adjacent fins 21 so that one hook 11 is inserted into the through holes 23 and 24, so that stress acting from the leg 8 d is applied. Are dispersed in each of the two fins 21 and exhibit high rigidity like a single thick fin. At this time, since the stress on one fin 21 is small, the fin 21 does not easily bend when the hook 11 is inserted. Further, the fan 3 is fixed to the heat sink 2 by one leg 8d engaging with two fins 21, so that the weight of the fan 3 is supported by twice as many fins 21 as the conventional one. Even if the fin 21 is thin, the fin 21 does not bend due to the weight of the fan 3, and the gap 12 between the upper end of the fin 21 and the rotating member is maintained as designed. As described above, this cooling device can correctly fix the fin 21 having a small thickness and a low rigidity to the heat sink 2 and the fan 3, and increase the number of the fins 21 to reduce the surface area of the entire heat sink 2. Since the expansion has been achieved, the cooling performance is high as a result.
[0014]
The material of the heat sink 2 is not limited to aluminum, but may be any metal having good thermal conductivity. As a forming method, other than the above-described extrusion forming, a drawing method or a method of shaving and raising the surface of the base 22 to form the fins 21 may be used. In the latter case, recesses to be the through holes 23 and 24 may be provided in the base 22 in consideration of the shape of the fins 21 after shaving. Alternatively, after the base 22 and the fins 21 are individually formed by pressing, cutting, or the like, the lower ends of the fins 21 may be embedded in the base 22 (hereinafter, referred to as a crimp type). In this case, the through holes 23 and 24 can be formed simultaneously with the molding of the fin 21. Further, a fin 21 formed by folding a single metal plate into a multilayer shape may be fixed to a metal base 22 having good heat conductivity.
Also, the hook 11 is projected only inside the leg 8d, but is projected outward as shown in the sectional view of the main part in FIG. 3 to form two hooks 11 for one leg 8d. The relationship between the number of hooks 11 and the number of fins 21 having through holes may be one-to-one. Even in this case, two fins 21 are still engaged with one leg 8d. Even if one fin 21 is thin, the fin 21 bends due to the stress from the leg 8d or the weight of the fan 3. The gap 12 between the upper end of the fin 21 and the rotating member is kept as designed.
[0015]
-Embodiment 2
A second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a longitudinal sectional view showing a cooling device according to the second embodiment, and FIG. 5 is a perspective view showing a state where a fan and a heat sink of the cooling device are separated.
The cooling device 1 of this embodiment has the same shape and the same shape as that of the first embodiment except for the shape of the fins 21 in the heat sink 2, and the fan 3 has the same configuration as that of the housing 8 except for the shapes of the legs 8d and the hooks 11. Since they are the same in shape and shape as 1, the same components are denoted by the same reference numerals, and description thereof is omitted. The method of forming the heat sink 2 may be the same as in the first embodiment. Hereinafter, differences from the first embodiment will be described in detail.
[0016]
First, in this embodiment, the positional relationship between the heat sink 2 and the fan 3 is different, and the heat sink 2 is arranged to be rotated by 90 degrees with respect to the fan 3 in plan view with respect to the first embodiment. That is, in the first embodiment, the fins 21 and the legs 8d are parallel, but in this embodiment, they are orthogonal.
The legs 8d at the four corners of the housing 8 are formed in a long plate shape, and the width of one leg 8d is approximately the same as the thickness of the two adjacent fins 21 and the distance between the adjacent fins 21. Is the same. At the lower end of each leg 8d, a hook 31 projecting outward in the surface direction of the fin 21, ie, in the thickness direction of the leg 8d, is formed, and in the middle, a stopper 41 projecting outward is formed. The hook 31 has a claw shape formed by an upper surface 31a that is perpendicular or slightly inclined with respect to the main surface of the leg 8d, and a lower surface 31b whose tip is connected to the upper surface 31a and is inclined with respect to the main surface of the leg 8d.
[0017]
On the other hand, unlike the first embodiment, the fin 21 does not have a through-hole, and instead has a notch 25 cut vertically downward from the upper end near both ends in the surface direction of the fin 21. The notches 25 are formed two by two in all the fins 21. Each notch 25 has a depth so as to be complementary to the shape of the stopper 41 or less of the leg 8d and spreads in a claw shape at the bottom, and the width in the surface direction is equal to the leg. The thickness is slightly smaller than the thickness of the claw-shaped portion at the tip of 8d. The in-plane spacing between the two notches 25 formed in one fin 21 is slightly smaller than the in-plane spacing between the two legs 8d of the fin 21 located in the in-plane direction.
In order to fix the fan 3 to the heat sink 2, the four legs 8d are simultaneously inserted from above the notch 25 (or two adjacent legs 8d may be inserted, and then the other two legs may be inserted). .). At this time, each leg 8d is elastically deformed so as to approach each other with respect to the surface direction of the fin 21, and is inserted from the opening of the corresponding notch 25. During insertion, the deformation is maintained, and the tip of the hook 31 closely contacts the side surface of the notch 25 and is elastically deformed in the upward direction, that is, the direction in which the upper surface 31a approaches the outer main surface of the leg 8d. When the lower end of the leg 8d reaches the bottom of the notch 25, the leg 8d and the hook 31 return to a fixed shape due to the elastic restoring force. Of the notch 25 fits into the expanded portion 25a of the notch 25. The one leg 8d is engaged with two adjacent fins 21, and the engagement is formed at four corners, and the heat sink 2 and the fan 3 are fixed.
[0018]
According to the cooling device 1, the stress acting from one leg 8d is distributed to each of the two fins 21 and the weight of the fan 3 is supported by twice as many fins 21 as the conventional one. The fins 21 are not easily bent even if they are thin. Further, the fan 3 is prevented from being pulled upward by the engagement of the total of four hooks 31 formed on each leg 8d and the eight notches 25. The gap 12 is maintained as designed by the lower end of the leg 8 d hitting the bottom of the notch 25, but the play of the fan 3 against the heat sink 2 is prevented by the stopper 41 hitting the upper end of the fin 21. At the same time, the extended portion 25a can have a margin for the hook 31, and the hook 31 can be easily received.
The notches 25 are formed with all the fins 21 and the notches 25 of the other fins 21 into which the legs 8d are not inserted serve as air passages, thereby contributing to an improvement in cooling performance.
[0019]
-Embodiment 3-
A third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a longitudinal sectional view showing a cooling device according to the third embodiment, and FIG. 7 is a perspective view showing a state where a fan and a heat sink of the cooling device are separated.
The cooling device 1 of this embodiment is also the same as the cooling device 1 of the first embodiment except for the shape of the fins 21 in the heat sink 2, and the fan 3 is the same as the cooling device 1 of the embodiment except for the shapes of the housing 8, especially the legs 8d and the hooks 11. Since they are the same in shape and shape as 1, the same components are denoted by the same reference numerals, and description thereof is omitted. The method of forming the heat sink 2 may be the same as in the first embodiment. Hereinafter, differences from the first embodiment will be described in detail.
[0020]
First, the positional relationship between the heat sink 2 and the fan 3 is the same as that of the second embodiment, and the heat sink 2 is arranged to be rotated by 90 degrees with respect to the fan 3 in a plan view than the first embodiment. Are orthogonal.
At the lower end of each leg 8d, a hook 51 projecting inward in the surface direction of the fin 21, ie, in the thickness direction of the leg 8d, is formed, and in the middle, a stopper 61 projecting inward is formed. That is, the projecting directions of the hook 51 and the stopper 61 are opposite to those of the second embodiment. The hook 51 has a claw shape formed by an upper surface 51a perpendicular to the main surface of the leg 8d, and a lower surface 51b having a leading end connected to the upper surface 51a and inclined with respect to the main surface of the leg 8d.
[0021]
On the other hand, the surface width of the fin 21 is slightly larger in the upper half of the fin than in the space between the opposing legs 8d, and smaller in the lower half of the fin. Therefore, a step 26 is formed at both ends in the surface direction of the fin 21 due to the difference in width between the upper half and the lower half, and the length of the step 26 is substantially the same as the protruding length of the upper surface 51 a of the hook 51.
In order to fix the fan 3 to the heat sink 2, the frame 8 c and the legs 8 d are elastically deformed in a direction in which the interval between the two legs 8 d facing each other in the surface direction of the fins 21 is expanded, and the frames 8 c and 8 d are lowered as they are. A group of fins 21 is arranged between them. When the force applied to the frame 8c and the leg 8d is released with the hook 51 passing through the step 26, the leg 8d returns to the home position by the elastic restoring force, and the portion of the fin upper half that protrudes from the lower half is hook 51. And the stopper 61. That is, the upper surface 51 a of the hook 51 hits the step 26, and the stopper 61 hits the upper end of the fin 21. Since the width of the leg 8d is larger than the interval between the fins 21, the upper half of the two fins 21 is fitted between the hook 51 and the stopper 61 of one leg 8d.
In this way, the fan 3 is prevented from coming off upward by the engagement of the total of four hooks 51 formed on each leg 8d and the eight steps 26. In addition, the gap 12 is maintained as designed by the stopper 61 abutting on the upper end of the fin 21. Also in this case, since one stopper 61 is in contact with the two fins 21, even if the fin 21 is thin, it does not bend due to the weight of the fan 3.
Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these, and various modifications are possible. For example, in each of the above embodiments, one leg 8d is configured to engage with two fins 21, but may be configured to engage with three or more fins. The four legs 8d formed on the frame 8c of the housing 8 are all the same, but need not necessarily be the same. The drawings cited in the description of the above embodiments are shown in a somewhat exaggerated manner while being simplified in order to make the configuration of the embodiments easier to understand.
[0022]
【The invention's effect】
As described above, the cooling device of the present invention can appropriately support the fan even with a thin fin, so that the cooling performance can be increased by increasing the number of fins, and the heat sink can be downsized. it can.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a cooling device according to a first embodiment.
FIG. 2 is a perspective view showing a state where a fan and a heat sink of the cooling device are separated.
FIG. 3 is a sectional view of a main part of another heat sink used in the cooling device.
FIG. 4 is a longitudinal sectional view showing a cooling device according to a second embodiment.
FIG. 5 is a perspective view showing a state where a fan and a heat sink of the cooling device are separated.
FIG. 6 is a longitudinal sectional view showing a cooling device according to a third embodiment.
FIG. 7 is a perspective view showing a state where a fan and a heat sink of the cooling device are separated.
FIG. 8 is a longitudinal sectional view showing a conventional cooling device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cooling device 2 Heat sink 21 Fin 22 Base 3 Fan 4 Rotation shaft 6 Driving magnet 7 Impeller 8 Housing 8c Frame 8d Leg 9 Stator 11, 31, 51 Hook 23, 24 Through hole 25 Notch 26 Step

Claims (5)

A heat sink having a plurality of plate-like fins arranged in the thickness direction and a base connecting the lower ends of the fins, a fan for sending wind to the heat sink with rotation, and a fan having a housing for rotatably holding the blades. In the cooling device provided,
The fan has a pair or a plurality of pairs of legs extending downward from both ends in the thickness direction or the surface direction of the fin of the housing,
The cooling device according to claim 1, wherein the heat sink has a portion where each leg engages over a plurality of adjacent fins. The cooling device according to claim 1, wherein a hook protruding in a direction substantially orthogonal to the fin is formed at a lower end of the leg, and the engaging portion is a through hole formed in the adjacent fin so as to receive the hook. . 2. A hook protruding in the surface direction of a fin is formed at a lower end of the leg, and the engaging portion is a notch cut from an upper end of an adjacent fin so as to complement a lower end of the leg. The cooling device according to claim 1. 2. The cooling device according to claim 1, wherein a hook protruding in the surface direction of the fin is formed inside a lower end of the leg, and the engaging portion is a step formed on both sides of an adjacent fin so as to be hooked on the hook. . It is a heat sink used in combination with a fan,
In a heat sink having a plurality of plate-like fins arranged in the thickness direction and a base connecting the lower ends of the fins,
In order to fix the fan to the fan, as a portion where the hook of the fan hooks on the fin, two or more fins adjacent to each other among the plurality of fins have concentric through holes, hook-shaped cuts cut from the upper end. A heat sink characterized in that either a notch or a step is formed on both sides.

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