JP2003218295A - Heat sink and cooling device having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily manufacture a heat sink whose heat radiating efficiency is satisfactory and a cooling device having the heat sink with high yield. <P>SOLUTION: A plurality of (for example, 12 pieces of) fin units 1 comprises a triangle-pole shaped metallic substrate 1a making a planar right triangle, and a plurality of heat radiating fins 1b erected on the upper face of the substrate 1a and arrayed almost in parallel. The units are arrayed in a row so that a heat sink 9 can be formed. This heat sink 9 is configured so that a space formed between the two fins 1b faced to each other in each fin unit 1 can be communicated between the adjacent fin units 1, and that a spiral channel 3 can be formed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink mounted on a heating element for cooling the heating element and a cooling device including the heat sink.

[0002]

2. Description of the Related Art Generally, in a computer, a CPU (Cen
tral Processing Unit / Central Processing Unit) and MPU (Micro
In order to prevent malfunction and performance deterioration due to temperature rise due to heat generation of the Processing Unit
The U and MPU are being forcibly cooled. As a cooling device of this type, as shown in FIG. 9, for example, a heat sink 103 having a large number of heat radiation fins 101 on a metal base 100 is attached to the surface of the CPU 105, and a housing 107 and a fan 109 attached to the housing 107 are used. By attaching the air blowing means 111 to the heat sink 103 and cooling the heat sink 103 with the cooling air from the fan 109, heat dissipation of the CPU 105 is promoted.

As a concrete example of a cooling device including such a combination of the heat sink 103 and the fan 109, Japanese Patent Laid-Open Nos. 7-30025 and 2001-10278 are available.
There is one described in Japanese Patent No.

By the way, in the case of this type of cooling device, the fan used is mainly an axial flow fan that produces cooling air in the axial direction of the rotary shaft, and the cooling air produced toward the heat sink is the fan. Since the heat of the heat sink is taken away while diffusing in a spiral shape as it rotates, in order to improve the air flow on the heat sink surface and efficiently dissipate the heat, each fin of the heat sink has a spiral shape. It is preferably arranged to form a stream of air.

However, in the cooling device described in each of the above publications, a plurality of columnar fins are arranged vertically and horizontally on the base (see Japanese Patent Application Laid-Open No. 7-30025), or fins elongated in one direction are used as the base. Since they are arranged at a predetermined interval above (see Japanese Patent Application Laid-Open No. 2001-102787), even if the cooling air from the axial fan is generated toward the heat sink, the fins are rather obstructive. There is a problem in that the air does not diffuse smoothly in a spiral shape, the air flow on the surface of the heat sink is greatly disturbed, and efficient heat dissipation cannot be performed.

Therefore, as described in US Pat. No. 5,661,638, it has been proposed to form a heat sink by arranging a large number of spirally formed fins on a base member. With this configuration, the spiral fins allow the cooling air from the axial fan to smoothly diffuse along the fins from the center of the spiral to the outer peripheral direction and remove heat from the heat sink, thereby efficiently cooling the heat sink.

[0007]

However, in the case of the conventional heat sink having the spiral fins, each of the slightly curved fins is cut or processed, or the conventional heat sink is disclosed in Japanese Unexamined Patent Publication No. 2001-2001.
As described in Japanese Patent Laid-Open No. 156224/1990, it is extremely difficult to create it by a technique of thinly raising a part of the surface of the base to integrally form each fin, and it is a little It may be possible to fix each curved fin by spirally welding it to the base member, but whichever method is used, it takes a lot of time and effort to manufacture the heat sink, resulting in poor yield. It was

[0008] Therefore, an object of the present invention is to make it possible to easily manufacture a heat sink having a good heat dissipation efficiency and a cooling device provided with the heat sink with a high yield.

[0009]

In order to achieve the above-mentioned object, a heat sink according to the invention of claim 1 has a metal base body having one surface attached to the heating element, and the other surface of the base body. A space formed between two fins facing each other in the fin unit, in which a plurality of fin units each including a plurality of radiating fins arranged upright and arranged substantially in parallel are arranged in parallel in the circumferential direction of the circle. Is communicated between the adjacent fin units in a juxtaposed state, and a spiral cooling medium passage is formed by juxtaposing the fin units.

According to such a configuration, by arranging a plurality of fin units side by side in the circumferential direction of the circle, the space between the two fins facing each other in each fin unit is increased between the fin units adjacent to each other. To form a spiral cooling medium flow path as a whole.

Therefore, the spiral cooling medium flow path can be formed only by arranging a plurality of fin units in parallel, and each fin is swirled to form the spiral cooling medium flow path as in the prior art. It is not necessary to process the heat sink into a shape, and it is sufficient to prepare a plurality of fin units, and a heat sink with good heat dissipation efficiency can be easily manufactured.

Here, the cooling medium may be liquid as well as gas, and air blown by a fan is most preferable. Further, it is most preferable that the fins are formed integrally with the base body, or the fins may be fixed to the base body by welding or the like, or in short, the fins may be bonded to the base body in a heat conductive state.

Further, in the heat sink according to the second aspect of the present invention, a spiral shape obtained by arranging the fin units in parallel progresses in the direction from the inner circumference to the outer circumference.
It is characterized in that the intervals between the fins in the fin unit gradually increase. According to such a configuration, when a plurality of fin units are arranged in parallel to form a spiral cooling medium flow path, the amount of air blown from a separately provided air blower is different between the central portion and the outer peripheral portion of the spiral. In the case of a difference, even if there is such a difference in the amount of blown air, the air flow in the spiral cooling medium passage can be made smoother, and effective cooling can be achieved.

The heat sink according to a third aspect of the invention is characterized in that the fins in the fin unit are spaced at equal intervals. With such a configuration, the fins are evenly spaced,
The fins can be easily processed as compared with the case where the intervals are different, and the fin unit can be manufactured more easily.

The heat sink according to a fourth aspect of the present invention is characterized in that the other surface of the base body has a substantially triangular shape. According to such a configuration,
When a plurality of fin units are installed side by side, without gaps,
Alternatively, the fin units can be arranged side by side with a certain gap, and the fin units can be arranged in a desired state to form a spiral cooling medium flow path. Further, by dividing one long base material, it is possible to form a plurality of fin units, and it is possible to improve the yield. still,
As the other surface shape of the base body in this case, regardless of whether it is a right triangle, an acute triangle or an obtuse triangle, the sides of each triangle forming the outer peripheral edge when arranged in parallel may be curved instead of being straight.
Further, it may be a trapezoid whose upper base has a very short length and a high height, and which looks like a triangle at first glance.

The heat sink according to a fifth aspect of the invention is characterized in that the height of the fins located on the center side of the fin units arranged in parallel is higher than that on the outer peripheral side.

According to such a structure, the amount of air blown to the spiral cooling medium flow path formed by each fin unit may be different between the center side and the outer peripheral part, depending on the type of the air blower. In such a case, by changing the height of each fin, the air can be made to flow smoothly according to the difference in the amount of air blown by the air blower, and efficient cooling can be performed.

The heat sink according to a sixth aspect of the present invention is characterized in that each of the fins of the fin unit is formed integrally with the base body. According to such a configuration, as compared with the case where a separately formed fin is fixed to the base body, the fixing work is not required and the manufacturing efficiency of the fin unit can be improved. Heat conduction can be secured.
Specifically, it is desirable to integrally form each fin by cutting or raising the base.

The heat sink according to the invention of claim 7 is characterized in that the heating element is an electronic component such as an IC. According to such a configuration, it is suitable for heat dissipation of semiconductor elements such as ICs, CPUs of computers, MPUs, etc., and especially of resin-molded electronic parts, and efficiently dissipates heat of the CPUs, etc. via a heat sink. It is possible to prevent the deterioration of the processing capability of the CPU by discharging the CPU.

Further, a cooling device according to an eighth aspect of the present invention comprises an air blowing means mounted on the heat sink according to any one of the first to seventh aspects, wherein the flow path is generated by the air blowing means. The feature is that it serves as a cooling air flow passage.

According to this structure, the cooling air from the blowing means smoothly flows through the spiral flow passage formed by each fin unit, so that the heating element such as an electronic component can be efficiently cooled. Moreover, since the cooling air smoothly flows through the spiral flow path, wind noise can be reduced, and a silent cooling device can be provided.

According to a ninth aspect of the present invention, in the cooling device, the air blowing means includes an axial fan that generates cooling air in the axial direction of the rotating shaft, and the axial fan rotates in the rotating direction. The feature is that it matches the direction of the spiral of the road. According to such a configuration, the spiral cooling air generated by the axial fan smoothly flows through the spiral flow passage from the center side toward the outer peripheral side, so that the spiral cooling air generated by the axial fan is cooled. It is possible to provide a silent cooling device that can efficiently use wind and has high cooling efficiency.

[0023]

(First Embodiment) First Embodiment of the Invention
An embodiment will be described with reference to FIGS. 1 to 4.
However, FIG. 1 is a plan view of the heat sink, FIG. 2 is a perspective view of the fin unit, FIG. 3 is an explanatory view of the arrangement interval of the fins, and FIG.
FIG. 2 is a front view of a cooling device including the heat sink shown in FIG. 1.

The heat sink in this embodiment is shown in FIG.
Or, as shown in FIG. 3, a plurality (here, 12)
The fin units 1 are formed side by side. Each fin unit 1 includes a metal base 1a of a triangular prism shape having a low height which forms a right triangle in a plan view, and a plurality of heat radiation fins 1b standing on the upper surface of the base 1a and arranged substantially in parallel. There is.

As the material of the base 1a, it is preferable to use, for example, aluminum which has good workability and high thermal conductivity. For each fin 1b, the base 1a is cut or extruded, or disclosed in JP-A-2001-156224. It is desirable to integrally form the base 1a by the shaving process as described. However, if the workability is sacrificed to some extent, a separately formed fin may be thermally conductively fixed by welding.

At this time, as shown in FIG. 3, the space between the fins 1b is represented by the angle θ of the right triangle.
(If the fin unit 1 has 12 pieces, θ is 30 °). That is, as shown in FIG. 3, when a right-angled triangle is used as a basic shape, the nth interval dn counted from the opposite side of the apex angle satisfies the relation of dn = dn-1 * cos θ ... (1) The spacing between the fins 1b may be set.

Therefore, according to the relationship of the equation (1), the spacing between the fins 1b in each fin unit 1 gradually increases from the apex angle side to the opposite side. Moreover, if the above formula (1) is satisfied, as shown in FIG. 1, when the fin units 1 are arranged side by side in the circumferential direction of the circle with the apex angle portion as the center side, the fin units 1 face each other 2 Since the space formed between the individual fins 1b communicates with each other without being displaced between the adjacent fin units 1, the fin units 1 are arranged side by side so that air as a cooling medium flows in the direction of the arrow in FIG. A plurality of spiral flow channels 3 which are cooling medium flow channels are formed.

In the example of FIG. 1, one spiral flow path 3 has 9
The nine spiral flow paths 3 which are formed by the individual fin units 1 and which are the intervals between the two adjacent fins 1b in the single fin unit 1 are arranged with the apex angle θ of the above-described right triangle displaced. It is set up.

In particular, as shown in FIG. 4, the height of the fins 1b located on the center side of each fin unit 1 is set higher than that on the outer peripheral side. The reason for this is that when cooling air is generated by an axial fan as an air blowing means, as will be described later, the amount of air blown on the center side of the axial fan is smaller than that on the outer peripheral side.
This is because by increasing the height of b toward the center side, the cooling air generated by the axial fan can be efficiently taken into the spiral flow passage 3.

Further, as shown in FIG. 4, the lower surface side of each fin unit 1 is thermally conductively fixed to the pedestal 5, and the lower surface of the pedestal 5 is a semiconductor element 7 such as a CPU which is an electronic component serving as a heating element. Are thermally conductively fixed. Thus
A heat sink 9 formed by arranging a plurality of fin units 1 in parallel on a pedestal 5 is formed. Then, the heat generated in the semiconductor element 7 diffuses to the fins 1b of the fin units 1 of the heat sink 9 via the pedestal 5.

By the way, in each fin unit 1,
The upper surface of the base body 1a on which the fins 1b are provided is formed into fine irregularities by sandblasting. By doing so, the surface area of the base body 1a can be increased, and the heat dissipation area can be expanded and cooled. You can hope for increased efficiency.

Further, as shown in FIG. 4, the housing 11
An axial fan 13 is supported above the heat sink 9 and serves as a blower that generates cooling air in the direction of the rotation axis. The heat sink 9 and the axial fan 13 constitute a cooling means. At this time, the housing 11 is configured by connecting a cylindrical body having a space in the shape of a short cylinder on the inner peripheral side and a support plate arranged in the central portion of the upper surface thereof by a plurality of arms. The axial fan 13 includes a fan motor 13 whose rotation shaft is rotatably supported by a support plate of the housing 11.
a and a plurality of impellers 13b mounted on the outer circumference of the motor case of the fan motor 13a. The housing 11 is detachably attached to the heat sink 9 by an attachment mechanism (not shown) to assemble the cooling device. .

By the rotation of the axial fan 13 as described above, the cooling air sucked into the trapezoidal fan 13 and blown out in a substantially columnar shape is rotated by the rotation of the impeller 13b of the axial fan 13. It is sprayed on the heat sink 9 in a spiral shape. Then, the blown air flows along the plurality of spiral flow paths 3 of the heat sink 9 and flows from the center of the spiral toward the outer peripheral side, and at this time, the semiconductor element 7 transmitted to each fin 1b of the heat sink 9. The air flows while taking away the heat of, and cools the heat sink 9.

Therefore, according to the first embodiment described above,
The spiral flow path 3 can be formed only by arranging a plurality of fin units 1 side by side, and it is not necessary to process each fin 1b to form the spiral flow path 3 as in the conventional case. It suffices to prepare a plurality of units 1 so that the heat sink 9 having good heat dissipation efficiency can be easily manufactured.

Further, since the spacing between the fins 1b in the fin unit 1 gradually increases from the center side of the spiral toward the outer peripheral portion, a plurality of fin units 1 are arranged side by side to form the spiral flow path 3. When formed, even if the amount of air blown from the axial fan 13 is different between the central portion and the outer peripheral portion, the air flow in the spiral flow passage 3 can be made smoother, and the cooling efficiency is improved. Can be achieved.

Further, since the fin unit 1 has a right-angled triangle in a plan view, when the distance between the fins 1b is set, any angle other than the right angle of the right-angled triangle, for example, the apex angle θ (see FIG. 3). ), The distance between the fins 1b can be determined by a simple calculation, and the fins 1b can be easily arranged.

Further, since the fin units 1 are arranged side by side in the circumferential direction with the apex angle portion of each fin unit 1 as the center side, each fin unit 1 has a polygonal shape (here, approximately 1).
The spiral flow path 3 can be easily and accurately formed. However, the number of fin units 1 arranged in parallel is not limited to the above-mentioned 12 units, and if the number of fin units 1 is further increased, the external shape of the heat sink 9 approaches a circular shape, and the spiral flow path 3
Can be made smoother, and further smoothing of air circulation can be desired.

Further, the amount of cooling air generated by the axial fan 13 differs between the center side and the outer peripheral portion of the spiral flow passage 3 formed by each fin unit 1, but the center side of each fin 1a. The axial fan 13
The cooling air can be smoothly circulated in the spiral flow passage 3, and efficient cooling can be performed.

As a modification of the first embodiment, FIG.
As shown in FIG. 7, even when the base body 1a is not a right-angled triangle in a plan view but a triangle (here, an acute-angled triangle), by arranging a plurality of fin units 1 side by side as described above, a spiral flow in which air flows is obtained. The path 3 can be formed.

In this case, the space between the fins 1b is, as shown in FIG. 5, the size of the most acute angle, and the angle θ1 is defined by a perpendicular line descending toward the opposite side.
And θ2, the n-th interval dn counted from the opposite side of this acute angle is dn = dn-1 * cos θ2 / co
The spacing between the fins 1b may be set so as to satisfy the relationship of sθ1 (2).

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG. However, FIG. 6 is a plan view of the heat sink. Note that, in FIG. 6, the same reference numerals as those in FIGS. 1 to 4 denote the same or corresponding ones, and in the following, differences from the first embodiment will be mainly described.

As shown in FIG. 6, the heat sink 15 of this embodiment is substantially different from the first embodiment described above in that the intervals between the fins 1b of the fin units 1 are made equal. In this case, the substrate remains a right triangle in a plan view.

In this way, if at least the fins 1b are formed at a predetermined interval on the metal base material having an equilateral triangle in a plan view, the two fin units 1 can be formed by equally dividing the base material into two. Can be formed at once. Depending on how to set the spacing between the fins 1b, a required number of long fins may be formed in the longitudinal direction of the metal base material that is rectangular in plan view, and the rectangular base material may be divided at one time. It is also possible to obtain a large number of fin units 1.

In the case of this embodiment, since the fins 1b are equally spaced, when a plurality of fin units 1 are arranged in parallel, they are formed between the two fins 1b facing each other in each fin unit 1. The spaces formed by the adjacent fin units 1 communicate with each other while being slightly displaced from each other. However, since the spiral flow passage 17 is formed as a whole, there is no problem in practical use, and the cooling air by the axial flow fan 13 does not exist. Flows smoothly in the spiral flow path 17 in the direction of the arrow in FIG.

As a modified example of the second embodiment, the base may be a triangle (here, an acute triangle) instead of the right triangle in plan view as shown in FIG.

As another modified example, FIG. 6 illustrates an example in which the apex angles of the fin units 1 each having a right triangle in plan view are aligned and arranged side by side so that no gap is formed in the center. As shown in FIG. 2, the fin unit 1 formed of acute-angled triangles in a plan view and having fins 1b arranged at equal intervals is arranged side by side with the sharpest-angled portions being slightly displaced without being aligned.
You may form the heat sink 19 which has a polygonal (here dodecagonal) space in the center part.

By doing so, even if the fin unit 1 has an acute-angled triangle in plan view and the fins 1b are arranged at equal intervals, a plurality of fin units 1 (here,
When the heat sink 19 is formed by arranging 11 fins side by side, the spaces formed between the two fins 1b facing each other in each fin unit 1 communicate with each other without being displaced between the adjacent fin units 1. The continuous spiral flow path 21 can be formed, and the air can be more smoothly circulated in the spiral flow path 21 as compared with the case where the spiral flow path 21 is displaced as shown in FIG. 6.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIG. However, FIG. 8 is a plan view of the heat sink. In the following, differences from the first and second embodiments will be mainly described.

In this embodiment, as shown in FIG. 8, instead of one type of fin unit 1 as in the first and second embodiments, two types of fin units 25 and 27 in which the arrangement of each fin 23 is different are used. The heat sink 29 is formed by preparing and arranging the fin units 25 and 27 having different arrangement patterns of the fins 23 alternately and arranging the apex angle portions in the circumferential direction of the circle. In this case, the substrate remains a right triangle in a plan view.

One of the fin units 25 has a fin 23, which is located on the opposite side of the apex angle, and which is the outermost fin 23 when arranged in parallel, and the fins 23 are arranged at equal intervals from the fin 23. Further, the other fin unit 27 is
The fins 23 on the outermost side when arranged in parallel are provided at a position slightly deviated from the position on the opposite side of the apex angle, and the fins 23 are arranged at equal intervals from the fins. It is less than 25.

At this time, the fin units 25 and 27 having different arrangement patterns of the fins 23 are alternately arranged and aligned in the circumferential direction of the circle with the apex angle portions aligned, so that the fin units 25 and 27 face each other. The space formed between the two fins 23 communicates with each other between the adjacent fin units 25 and 27 with almost no deviation, and a substantially continuous spiral flow path 31 is formed.

Therefore, according to the third embodiment, the fin 2
As shown in FIG. 6, by arranging the fin units 25 and 27 having different arrangement patterns of 3 alternately in parallel, the fin units 1 of one kind of arrangement pattern in which the fins 1b are arranged at equal intervals are arranged in parallel. In comparison with the adjacent fin units 25 and 27, each fin unit 2
It is possible to reduce the deviation of the space formed between the two fins 23 that face each other in each of Nos. Can be smooth,
Efficient cooling can be realized.

As a modification of the third embodiment, the base may be a triangle (here, an acute triangle) instead of the right triangle in plan view.

Furthermore, the fin units having different arrangement patterns of the fins 23 are not limited to two types as described above, and may be three or more types.

In each of the above-mentioned embodiments, the cooling medium is described as air. However, a gas other than air may be used, and the present invention is similarly applied to the case where a liquid is used as the cooling medium. It can be applied and the same effect as each of the above-described embodiments can be obtained.

Further, in each of the above-described embodiments, the case where the height of the fins located on the center side of the fin units arranged side by side in the circumferential direction of the circle is set higher than that on the outer peripheral side has been described. Of course, all heights may be the same.

Further, in each of the above-described embodiments, the case where the upper surface of the base body having each fin is finely roughened has been described, but it is not always necessary to perform such roughening processing on the upper surface of the base body. The shape of the base body is not limited to the above triangular prism shape, and may be any solid body having at least a fin-forming surface having a substantially triangular shape. The triangle at this time may be a right-angled triangle, an acute-angled triangle, or an obtuse-angled triangle, and the sides of each triangle that forms the outer peripheral edge when juxtaposed may be curved instead of being straight, and the length of the upper base is very large. It may be a trapezoid that is short and high, and looks like a triangle at first glance.

In each of the above-described embodiments, as an application example of the present invention, the semiconductor element 7 such as a CPU or MPU of a computer which is an electronic component is used as the heating element. It is needless to say that the present invention can be applied to electronic components such as a Rutier cooling element and the same effects as those of the above-described embodiments can be obtained.

Further, in each of the above-mentioned embodiments, the blower means is the axial fan 13, but the blower means is not limited to the axial fan.

The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

[0061]

As described above, according to the invention of claim 1, by arranging a plurality of fin units in parallel,
A space between two fins facing each other in each fin unit is communicated between the fin units adjacent to each other, thereby forming a spiral cooling medium flow path as a whole. A spiral cooling medium flow path can be formed simply by arranging them side by side, and it is not necessary to process each fin into a spiral shape in order to form a spiral cooling medium flow path as in the conventional case. It suffices to prepare a plurality of heat sinks, and it is possible to easily manufacture a heat sink having good heat dissipation efficiency.

Further, according to the second aspect of the present invention, when a plurality of fin units are arranged in parallel to form a spiral cooling medium flow path, the amount of air blown from the separately provided air blowing means is swirled. When there is a difference between the central part and the outer peripheral part of
Even if there is such a difference in the amount of air blown, it is possible to make the air flow in the spiral cooling medium flow path smoother and realize effective cooling.

Further, according to the third aspect of the invention, since the fins are arranged at equal intervals, the fins can be processed more easily than when the intervals are different, and the fin unit can be manufactured more easily. It will be possible.

According to the invention described in claim 4, when a plurality of fin units are arranged side by side, they can be arranged side by side without a gap or with a certain gap, so that a desired state can be obtained. The fin units can be arranged in parallel to form a spiral cooling medium flow path. Further, by dividing one long base material, it is possible to form a plurality of fin units, and it is possible to improve the yield.

According to the fifth aspect of the present invention, the amount of air blown to the spiral cooling medium flow passage formed by each fin unit differs depending on the type of the air blower between the center side and the outer peripheral portion. In such a case, by changing the height of each fin, it is possible to smoothly flow air according to the difference in the amount of air blown by the air blower, and it is possible to perform efficient cooling.

According to the sixth aspect of the invention, as compared with the case where the separately formed fin is fixed to the base, the fixing work is unnecessary and the fin unit manufacturing efficiency can be improved. Moreover, it becomes possible to secure the heat conduction between each fin and the base body.

According to the invention of claim 7, I
It is suitable for heat dissipation of semiconductor elements such as C and CPUs of computers, especially for resin-molded electronic parts, and efficiently dissipates heat of the CPUs and the like through a heat sink to reduce the processing capacity of the CPUs. It becomes possible to prevent.

Further, according to the invention described in claim 8, the cooling air by the air blowing means smoothly flows through the spiral flow passage formed by each fin unit, so that the heating elements such as electronic parts can be efficiently supplied. Since the cooling air can be cooled and the cooling air flows smoothly through the spiral flow path, the wind noise can be reduced, and a silent cooling device with high cooling efficiency can be provided.

According to the ninth aspect of the present invention, the spiral cooling air generated by the axial fan smoothly flows through the spiral flow passage from the center side toward the outer peripheral side. It is possible to efficiently use the spiral cooling air generated by the fan, and to provide a silent cooling device with high cooling efficiency.

[Brief description of drawings]

FIG. 1 is a plan view of a heat sink according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a fin unit according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of an arrangement interval of fins in the first embodiment of the present invention.

FIG. 4 is a front view of a cooling device including the heat sink shown in FIG.

FIG. 5 is an explanatory diagram of fin arrangement intervals in a modified example of the first embodiment of the present invention.

FIG. 6 is a plan view of a heat sink according to a second embodiment of the present invention.

FIG. 7 is a plan view of a heat sink in a modified example of the second embodiment of the present invention.

FIG. 8 is a plan view of a heat sink according to a third embodiment of the present invention.

FIG. 9 is a front view of a conventional cooling device.

[Explanation of symbols]

1,25,27 fin unit 1a base 1b, 23 fins 3,17,21,31 spiral flow path (cooling medium flow path) 5 pedestals 7 Semiconductor elements (electronic parts, heating elements) 9,15,19,29 Heat sink 13 Axial fan (blower means)

Continued front page    (72) Inventor Takayuki Kishi             55 Mimizuguchi-cho, Mizuno, Hino-gun, Tottori Prefecture             Honden Electronics Co., Ltd. Tottori Technology             In the development center (72) Inventor Hirotsugu Yokotani             55 Mimizuguchi-cho, Mizuno, Hino-gun, Tottori Prefecture             Honden Electronics Co., Ltd. Tottori Technology             In the development center (72) Inventor Yusuke Yoshida             55 Mimizuguchi-cho, Mizuno, Hino-gun, Tottori Prefecture             Honden Electronics Co., Ltd. Tottori Technology             In the development center F term (reference) 5E322 AA01 AA11 BA05 BB02 BB03                 5F036 AA01 BA04 BA24 BB05

Claims (9)

[Claims] 1. A heat sink mounted on a heat-generating body to cool the heat-generating body, a metal base having one surface attached to the heat-generating body,
A plurality of fin units each of which is provided on the other surface of the base body and has a plurality of heat radiation fins arranged substantially in parallel are arranged in parallel in the circumferential direction of the circle, and the two fins facing each other in the fin unit. A heat sink characterized in that a space formed therebetween is communicated between the adjacent fin units in a juxtaposed state, and a spiral cooling medium flow path is formed by juxtaposing the fin units. 2. The space between each of the fins in the fin unit gradually widens as the fin unit progresses in the direction from the inner circumference toward the outer circumference in a spiral shape obtained by arranging the fin units in parallel. The heat sink according to claim 1. 3. The heat sink according to claim 1, wherein the fins of the fin unit have equal intervals. 4. The heat sink according to claim 1, wherein the other surface of the base has a substantially triangular shape. 5. The heat sink according to claim 1, wherein the fins located on the center side of the fin units arranged in parallel have a height higher than that on the outer peripheral side. 6. The fins of the fin unit,
The heat sink according to claim 1, wherein the heat sink is formed integrally with the base body. 7. The heat sink according to claim 1, wherein the heating element is an electronic component. 8. An air blower attached to the heat sink according to claim 1, wherein the flow path comprises:
A cooling device, which serves as a passage for cooling air generated by the air blower. 9. The blower means includes an axial fan that generates cooling air in the axial direction of the rotary shaft, and the rotation direction of the axial fan matches the direction in which the spiral of the flow passage spreads. The cooling device according to claim 8.