JP2587582B2 - Heat sink and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink having a plurality of rod-shaped or plate-shaped fins on a base plate, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a heat sink, a heat sink formed by, for example, an insertion brazing method is known (JP-A-54-47154). In this method, as shown in FIG.
In this method, a brazing material 91 is clad on a surface and inserted into a groove 92 formed in a base plate 90, and the inserted portion is brazed. However, in the above method, a cladding step, a groove forming step, and the like are required, and the productivity is poor. Further, in order to obtain a uniform heat sink, high dimensional accuracy of the members is required, and from this point, productivity is low.
For example, as shown in FIG. 25, the width of the groove 92 is too large,
If the brazing gap is large, the fins 80 are inclined, or the brazing gap becomes uneven, so that a uniform heat sink cannot be obtained. If the heat sink is not uniform, the expected heat dissipation effect cannot be obtained.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat sink having a simple and strong structure and a more uniform structure, and to provide a method for easily manufacturing the heat sink. .

[0004]

According to a first aspect of the present invention, there is provided a heat sink comprising a base plate and a plurality of bar-shaped fins arranged upright at right angles to the surface thereof. , The end of which is inserted into each of a number of through-holes of the base plate, the end of the rod-shaped fin is formed into a tapered shape by tapering, and the diameter of the portion that changes to tapered is the through-hole. The length of the tapered portion is set shorter than the thickness of the base plate, and the rod-shaped fin is a solder or brazing material that is densely filled in the space around the tapered portion in the through hole. And is joined to the base plate.

A heat sink according to a second aspect of the present invention is a heat sink in which a number of bar-shaped fins are erected on a base plate at right angles to the surface thereof. The materials are arranged side by side with their sides facing each other and integrated,
The rod-shaped fin has its end sandwiched between opposing side surfaces of the extruded profile, and a concave portion is formed on the opposing side surface of the extruded profile, and the concave portion is formed on the opposing side surface. The end portion of the rod-shaped fin is sandwiched by the recessed portion, and is formed in such a shape that a gap is formed between the end portion and the wall of the recessed portion and between opposing side surfaces in the sandwiched state. The rod-shaped fin is characterized in that it is joined to the base plate by solder or brazing material that is densely filled in the gap.

A heat sink according to a third aspect of the present invention is a heat sink in which a large number of plate-like fins are erected on a base plate at right angles to the surface thereof. The profile members are arranged side by side with their sides facing each other and integrated,
The plate-like fin has its end sandwiched by opposing side surfaces of the extruded profile, and there is a gap without the plate-like fin between the opposing side surfaces. It is characterized in that it is joined to the base plate by tightly filled solder or brazing material.

A heat sink according to a fourth aspect of the present invention is a heat sink in which a number of rod-shaped fins are erected at right angles to a surface of a base plate, and has a rib in a thickness direction near an end. A plurality of plate-shaped extruded members of a predetermined shape are formed by being overlapped with each other via a rib and joined to each other by a solder or a brazing material. The base plate is formed of a joint portion of the extruded profile with the solder or brazing material, and is opposite to the joint portion of the extruded profile with the rib as a boundary. The side portion is formed in a comb shape, and each of the comb portions is a bar-shaped fin.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a heat sink, comprising: a base plate having a large number of rod-shaped fins erected at right angles to the surface thereof;
In a manufacturing method, a large number of through-holes are formed in a base plate, and the end of each rod-shaped fin is formed in a narrow shape such that a gap is formed between the end of each bar-shaped fin and the wall of the through-hole. Insert the end portion of the rod-shaped fin into each of the through holes of the base plate, and immerse the through hole of the base plate in molten solder or molten brazing material in that state,
The method is characterized in that the gap is filled with the solder or brazing material by applying ultrasonic vibration, and the rod-shaped fin is joined to the base plate.

In a sixth aspect of the present invention, there is provided a method of manufacturing a heat sink, comprising: a base plate having a plurality of rod-shaped fins standing upright at right angles to the surface thereof;
A method of manufacturing, wherein a base plate is formed by integrating a large number of block-shaped extruded members in parallel with their side surfaces facing each other, and forming concave portions on opposed side surfaces of the extruded members. The end portion of the extruded profile is clamped by the concave portion formed on the opposing side surface, and a gap is formed between the end portion and the wall of the concave portion and between the opposing side surfaces in the clamped state. The extruded profile is formed in such a shape, the extruded profiles are arranged side by side, and the ends of the bar-shaped fins are sandwiched by opposing recesses. It is characterized in that the gap is filled with the solder or the brazing material by immersing it in a medium or a molten brazing material and applying ultrasonic vibration to join the rod-shaped fin to the base plate.

The method of manufacturing a heat sink according to a seventh aspect of the present invention is directed to a heat sink comprising a base plate having a number of plate-like fins erected at right angles to the surface thereof.
A method for manufacturing a base plate, wherein a base plate comprises a large number of block-shaped extruded members which are arranged side by side and are integrated with their side surfaces facing each other. In addition, the end of the plate-like fin is sandwiched by the opposing side surfaces so that a gap without the plate-like fin is formed between the opposing side surfaces. It is characterized in that the gap is filled with the solder or the brazing material by immersing in the inside and applying ultrasonic vibration, and the rod-shaped fin is joined to the base plate.

According to an eighth aspect of the present invention, there is provided a method for manufacturing a heat sink, comprising: a heat sink comprising a base plate having a number of bar-shaped fins erected at right angles to the surface thereof;
A method of manufacturing, having a rib in the thickness direction in the vicinity of the end and a portion opposite to the end with respect to the rib is formed in a comb shape, a plate-shaped extruded shape, By overlapping a plurality of via a rib, the gap portion formed by the adjacent extruded profile and the rib in the overlapped body, immersed in molten solder or molten brazing material, by applying ultrasonic vibration The method is characterized in that the gap is filled with the solder or brazing material and the extruded members are joined to each other.

[0012]

In the heat sinks according to the first to third aspects of the present invention, the fins and the base plate are joined by solder or brazing material that has penetrated sufficiently into every corner of the gap. Moreover, the fins are merely joined by being inserted into the through holes of the base plate or sandwiched by the extruded members constituting the base plate.

In the heat sink according to the fourth aspect of the present invention, the adjacent extruded members are joined by solder or brazing material which has sufficiently penetrated into every corner of the gap. In addition, the extruded profile has a portion constituting the base plate and a portion serving as the rod-shaped fin integrally. Furthermore, since the extruded shapes can be mass-produced, there is no problem in dimensional accuracy.

In the method for manufacturing a heat sink according to the fifth to eighth aspects of the present invention, since the ultrasonic vibration is applied, the oxide film on the surface of the joint is destroyed. The wettability with the brazing material is improved, and the surface tension of the molten solder or the molten brazing material is reduced due to vibration. Therefore, the molten solder or the molten brazing material sufficiently penetrates all corners of the gap.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a plan view showing a heat sink of the present embodiment, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a partially enlarged view of FIG. FIG. The heat sink 1 is configured by joining a large number of rod-shaped fins 3 to a base plate 2 in an upright state. Both 2 and 3 are made of aluminum.

As shown in FIGS. 2 and 3, a large number of through holes 21 are formed in the base plate 2, and the rod-shaped fin 3 has an end 31 inserted into the through hole 21. The rod-shaped fin 3 is a cylindrical body, and an end 31 of the rod-shaped fin 3 is provided.
Is formed in a tapered shape by taper processing, and the length L is set shorter than the thickness T of the base plate 2. Therefore, a space including a gap between the end portion 31 and the wall of the through hole 21 is formed in the through hole 21. The space is filled with solder 5 densely, and the bar-shaped fins 3 are joined to the base plate 2 by the solder 5. Note that the end 31 has a shape that is temporarily fixed in a state where it is simply inserted into the through-hole 21, and specifically, the diameter X of the portion of the end 31 that is tapered. (FIG. 3) is equal to the diameter of the through hole 21. The maximum width of the space is set to about 0.3 mm. The solder 5 is a solder for an aluminum member, and here, a eutectic solder of 95% Zn-5% Al is used.

Next, a method of manufacturing the heat sink 1 having the above configuration will be described. First, as shown in FIG. 4, a large number of through holes 21 are formed in the base plate 2, and the end portions 31 of the rod-shaped fins 3 are formed in the tapered shape as described above. Then, with the end 31 inserted into the through-hole 21, as shown in FIG. 5, the base plate 2 is immersed in the molten solder 5 in the bath 7 so that the through-hole 21 is sufficiently immersed. Ultrasonic vibration is applied to the bath 7 or the base plate 2. Specifically, for example, the temperature of the molten solder 5 is 420 ° C., and the frequency of the ultrasonic vibration applied is 18 kHz.
It is about. A space 6 including a gap 61 between the end portion 31 and the wall of the through hole 21 is formed in the through hole 21.

If the base plate 2 having the rod-shaped fins 3 is simply immersed in the molten solder 5, the molten solder 5 is repelled because an oxide film is formed on the surface of the end portion 31 and the wall of the through hole 21. In addition, due to the surface tension of the molten solder 5, the molten solder 5 does not spread particularly in the gap 61 in the space 6, and the gap 61 is not densely filled with the solder 5. However, since the ultrasonic vibration is applied, the oxide film is destroyed, so that the wettability between the surface of the end portion 31 and the wall of the through hole 21 and the molten solder 5 is improved, and the molten solder 5 vibrates. Therefore, the molten solder 5 penetrates into every corner of the gap 61 sufficiently, and the space 6 is densely filled with the solder 5 as shown in FIG.

When the filling of the solder 5 into the space 6 is completed, the base plate 2 provided with the bar-shaped fins 3 is pulled up from the molten solder 5 and the portion of the solder 5 protruding from the space 6 is scraped off by machining. Thereby, the heat sink 1 having the above configuration is obtained.

The above method is based on the method of
This is very simple because the end 31 of the bar-shaped fin 3 is inserted into 1, it is immersed in the molten solder 5, and the space 6 is filled with the solder 5 by ultrasonic vibration. In addition, since the space 6 is filled with the solder 5 by applying ultrasonic vibration, the solder 5 penetrates into every corner of the gap 61 sufficiently, and the joining between the bar-shaped fin 3 and the base plate 2 is performed without any trouble. .

The heat sink 1 obtained by the above method is strong because the rod-shaped fins 3 and the base plate 2 are joined by the solder 5 which has penetrated into every corner of the space 6. Moreover, since the end 31 of the rod-shaped fin 3 is merely inserted into the through hole 21 of the base plate 2 and joined, the configuration is simple.

(Embodiment 2) FIG. 6 is a plan view showing a heat sink of this embodiment, FIG. 7 is a sectional view taken along the line VII--VII of FIG. 6, and FIG.
6 is a sectional view taken along line VIII-VIII of FIG. 6, FIG. 9 is a partially enlarged view of FIG.
FIG. 10 is an exploded perspective partial view of FIG. This heat sink 1a has a large number of rod-like fins 3a on a base plate 2a.
Are connected in an upright state. Both 2a, 3
a is both made of aluminum.

The base plate 2a is composed of several, here five, block-shaped extruded members 22 arranged side by side with their side surfaces 22a facing each other and integrated. The rod-shaped fin 3a is a cylindrical body. A plurality of recesses 23 are formed on the side surface 22 a of the extruded profile 22 in the thickness direction of the extruded profile 22. The concave portion 23 clamps the end portion 31a of the bar-shaped fin 3a by the concave portion 23 formed on the side surface 22a of the extruded profile 22 and, between the end portion 31a and the wall of the concave portion 23 in the clamped state. It is formed in such a shape that a gap is created between the opposing side surfaces 22a. The gap is filled with the solder 5 densely, and the bar-shaped fin 3a is joined to the base plate 2a by the solder 5. Specifically, as shown in FIG. 9, for example, the concave portion 23 has a half cross-sectional shape of an ellipse, a shorter diameter Y1 is smaller than a radius of the rod-shaped fin 3a, and a longer diameter Y2 is smaller than that of the rod-shaped fin 3a. It is set larger than the radius. In addition, the maximum width of the gap is about 0.
It is set to 3 mm. The same solder 5 as in the first embodiment is used.

Next, a method of manufacturing the heat sink 1a having the above configuration will be described. First, the side surface 22 of the extruded shape member 22
A concave portion 23 is formed in a. Next, the extruded members 22 are arranged side by side with their side surfaces 22a facing each other, and the end portions 31a of the rod-shaped fins 3a are clamped by the concave portions 23 facing each other. At this time, a gap 6a (FIG. 11) is formed between the end portion 31a and the wall of the concave portion 23 and between the opposing side surfaces 22a. Then, as shown in FIG.
The concave portion 23 of the base plate 2a holding the base plate 2a is immersed in the molten solder 5, and in that state, ultrasonic vibration is applied to the bath 7 or the base plate 2a. Specific conditions are, for example, the same as in the first embodiment. As a result, similarly to the first embodiment, the molten solder 5 sufficiently penetrates all corners of the gap 6a, and the rod-shaped fins 3a are joined to the base plate 2a by the solder 5. And the gap 6a of the solder 5
The heat sink 1a of this embodiment is obtained by shaving off the protruding portion.

That is, the heat sink 1a of this embodiment is manufactured in the same manner as in the first embodiment, and has the same operation and effect. That is, the rod-shaped fin 3a and the base plate 2a can be joined very easily in the manufacturing process without any trouble.

(Embodiment 3) FIG. 12 is a front view showing a heat sink according to the present embodiment, FIG. 13 is a view taken along arrow XIII in FIG. 12, FIG. 14 is a view taken along arrow XIV in FIG. 12, and FIG. -X
V is a partial enlarged view, FIG. 16 is an XVI-XVI sectional view of FIG. 14, and FIG. 17 is an exploded perspective partial view of FIG. The heat sink 1b is configured by joining a large number of plate-like fins 3b to a base plate 2b in an upright state. Both 2
Both b and 3b are made of aluminum.

The base plate 2b is composed of several, here nine, extruded block-shaped members 24 arranged side by side with their side surfaces 24a facing each other and integrated. The plate-like fin 3b is a flat plate. The plate-like fin 3b has an edge 3
1b is sandwiched between the opposing side surfaces 24a, and the end 131b of the end portion 31b is located approximately in the middle of the thickness of the extruded member 24 between the opposing side surfaces 24a. Therefore, a gap is formed between the opposing side surfaces 24a without the edge portion 31b. As shown in FIG. 14, since the width W1 of the plate-like fin 3b is smaller than the width W2 of the extruded profile 24, the gap is formed not only below the edge 131b but also on both sides of the edge 31b. I have. The gap is filled with solder 5 densely, and the plate-like fin 3b is joined to the base plate 2b by the solder 5. The same solder 5 as in the first embodiment is used.

Next, a method of manufacturing the heat sink 1b having the above configuration will be described. First, the extruded members 24 are arranged side by side with their side surfaces 24a opposed to each other, and the edge portions 31b of the plate-like fins 3b are sandwiched by the opposed side surfaces 24a so as to form the above-mentioned gap 6b (FIG. 18). I do. Then, as shown in FIG. 18, the gap 6b of the base plate 2b sandwiching the plate-like fin 3b is immersed in the molten solder 5, and in that state, the bath 6 or the base plate 2b is
Apply ultrasonic vibration. Specific conditions are described in, for example, Example 1.
Is the same as As a result, similarly to the first embodiment, the molten solder 5 sufficiently enters every corner of the gap 6b,
The plate-like fin 3b is joined to the base plate 2b by the solder 5. Then, by removing a portion of the solder 5 protruding from the gap 6b, the heat sink 1b of the present embodiment is obtained.

That is, the heat sink 1b of this embodiment is manufactured in the same manner as in the first embodiment, and has the same operation and effect. That is, it can be obtained very easily, the plate-like fin 3b and the base plate 2b can be joined without any trouble in the manufacturing process, and they are firmly joined by the solder 5, and the structure is simple.

(Embodiment 4) FIG. 19 is a front view showing a heat sink according to the present embodiment, FIG. 20 is a view taken on line XX of FIG.
1 is a view on arrow XXI of FIG. This heat sink 1
“c” is configured by arranging a large number of rod-shaped fins 3c on a base plate 2c.

This heat sink 1c is formed by stacking several extruded members 25 shown in FIG. The extruded member 25 is plate-shaped, has a rib 25a in the thickness direction near the lower end portion, and the upper end portion is formed in a comb shape with the rib 25a as a boundary. Numeral 30 is a comb-like portion. The protruding height H1 of the rib 25a is set to be the same as the thickness T2 of the extruded profile 25. Solder 5 is made of extruded material 2
5 and the gap formed by the rib 25a. In this heat sink 1c, the base plate 2c is composed of a joint of the extruded profile 25 with the solder 5, and each of the comb-shaped portions of the extruded profile 25 is a bar-shaped fin 3c. The solder 5 is a solder for an aluminum member, and here, a eutectic solder of 95% Zn-5% Al is used.

Next, a method of manufacturing the heat sink 1c having the above configuration will be described. First, thirteen extruded members 25 having the shape shown in FIG. 22 are prepared. Comb portion 3 of extruded profile 25
0 is formed by press punching. Next, the thirteen extruded members 25 are overlaid via the ribs 25a. The superposed body 125 has adjacent extruded members 25 and ribs 2.
A gap 6c (FIG. 23) is formed by 5a.
Then, as shown in FIG.
The gap 6c is immersed in the molten solder 5 in the bath 7 so as to be sufficiently immersed therein.
Then, ultrasonic vibration is applied. Specific conditions are, for example, the same as in the first embodiment. As a result, similarly to the first embodiment, the molten solder 5 sufficiently penetrates into every corner of the gap 6c, and the adjacent extruded members 25 are joined by the solder 5. Then, the portion of the solder 5 protruding from the gap 6c is scraped off to remove the heat sink 1c of the present embodiment.
Is obtained.

In the above method, the extruded members 25 are overlapped,
The laminated body 125 is immersed in the molten solder 5,
This is very simple because only the space 6c is filled with the solder 5 by ultrasonic vibration. Moreover, since the filling of the solder 5 into the space 6c is performed by applying ultrasonic vibration,
The solder 5 sufficiently penetrates into every corner of the gap 6c, and the extruded members 25 are joined without any trouble.

Then, the heat sink 1c obtained by the above method is strong because the adjacent extruded members 25 are joined by the solder 5 which has sufficiently penetrated into every corner of the gap 6c. In addition, the extruded shape 25 has a simple structure because it integrally has a portion forming the base plate 2c and a portion forming the rod-shaped fin 3c.
Further, since the same extruded material 25 can be mass-produced, there is no problem in dimensional accuracy, and therefore, the heat sink 1c is uniform.

(Another Embodiment) (1) In Embodiments 1 to 4, instead of the solder 5, a brazing material for an aluminum member may be used.

(2) In the first embodiment, the shape of the end 31 is not limited to a tapered shape as long as a space is formed around the inside of the through hole 21. Also,
The length L (FIG. 3) may be the same as the thickness T.

(3) In the second embodiment, the length L1 (FIG. 7) of the end 31a may be shorter than the thickness T1 of the base plate 2a.

(4) In the first and second embodiments, the rod-shaped fins 3 and 3a are not limited to cylindrical bodies, and may be, for example, square pillars. Correspondingly, the through-hole 21 is not limited to a circular shape, and the concave portion 23 is not limited to an elliptical half-shape. For example, the through hole 21 and the concave portion 23 may have a square shape.

[0039]

According to the present invention as described above, the following effects can be obtained. (1) According to the heat sink of the first aspect, the tapered transition portion comes into contact with the peripheral edge of the through hole, so that the fin can be maintained in a stable standing state. In addition, not only the peripheral surface of the tapered portion (end portion 31) but also the entire surface including the tip surface,
The fins can be firmly joined to the base plate because they are in contact with the solder or brazing material and are involved in joining with the base plate. Moreover, since the fins are merely inserted and joined to the through holes of the base plate, the configuration is also simple. (2) According to the heat sink according to claim 2 or 3,
Since the fin and the base plate are joined by solder or brazing material that has penetrated sufficiently into every corner of the gap, the fin and the base plate are strong. Moreover, the fins are simply joined by being inserted into the through holes of the base plate or sandwiched by the extruded members forming the base plate, so that the structure is simple.

(2) According to the heat sink of the fourth aspect, since the adjacent extruded members are joined by the solder or brazing material which has sufficiently penetrated into the corners of the gap, the extruded members become strong. In addition, the extruded shape has a simple structure because it has a portion constituting the base plate and a portion serving as the bar-shaped fin integrally. Further, since the extruded members can be mass-produced, there is no problem in dimensional accuracy, and therefore, the heat sink is uniform.

(3) In the method for manufacturing a heat sink according to any one of the fifth to eighth aspects, the base plate holding the fins or the extruded shape material overlapped is immersed in the molten solder or the molten brazing material. It is very simple because only the gap is filled with solder or brazing material by sonic vibration. In addition, since the gap is filled with the solder or brazing material by applying ultrasonic vibration, the solder or brazing material sufficiently penetrates into every corner of the gap, and the fin and the base plate are joined without any trouble.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a heat sink according to a first embodiment.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is an exploded sectional partial view of FIG. 3;

FIG. 5 is a sectional view showing one step of a method for manufacturing the heat sink of the first embodiment.

FIG. 6 is a plan view illustrating a heat sink according to a second embodiment.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a partially enlarged view of FIG. 6;

FIG. 10 is an exploded perspective partial view of FIG. 7;

FIG. 11 is a cross-sectional view showing a step of the method for manufacturing the heat sink of the second embodiment.

FIG. 12 is a front view illustrating a heat sink according to a third embodiment.

13 is a view taken in the direction of the arrow XIII in FIG. 12;

FIG. 14 is a view taken in the direction of the arrow XIV in FIG. 12;

FIG. 15 is an enlarged cross-sectional view taken along a line XV-XV in FIG. 14;

16 is a sectional view taken along the line XVI-XVI in FIG.

17 is an exploded perspective partial view of FIG.

FIG. 18 is a cross-sectional view illustrating a step of the method for manufacturing the heat sink according to the third embodiment.

FIG. 19 is a front view illustrating a heat sink according to a fourth embodiment.

20 is a view as viewed in the direction of the arrow XX in FIG. 19;

21 is a view as viewed in the direction of the arrow XXI in FIG. 19;

FIG. 22 is a perspective view showing an extruded member constituting a heat sink according to a fourth embodiment.

FIG. 23 is a cross-sectional view illustrating a step of the method for manufacturing the heat sink according to the fourth embodiment.

FIG. 24 is a partially enlarged cross-sectional view showing one step of a conventional method for manufacturing a heat sink.

FIG. 25 is a partially enlarged sectional view of a conventional heat sink.

[Explanation of symbols]

 1, 1a, 1b Heat sink 2, 2a, 2b Base plate 3, 3a Rod fin 3b Plate fin 5 Solder 6a, 6b, 6c, 61 Gap 22, 22, 25 Extruded profile 22a, 24a Side surface 23 Recess 25a Rib

Claims (8)

(57) [Claims] 1. A heat sink comprising a base plate and a plurality of bar-shaped fins standing upright at right angles to the surface thereof, wherein each bar-shaped fin has an end portion formed in each of a number of through holes of the base plate. The end of the rod-shaped fin is tapered to form a tapered shape, the diameter of the tapered portion is equal to the diameter of the through hole, and the length of the tapered portion is A heat sink, wherein the rod-shaped fin is set to be shorter than the thickness of the base plate, and the rod-shaped fin is joined to the base plate by solder or brazing material that is densely filled in a space around the tapered portion in the through hole. 2. A heat sink comprising a plurality of bar-shaped fins standing upright on a base plate at right angles to the surface thereof, wherein the base plate has a large number of extruded block-shaped members whose side faces face each other. The bar-shaped fins are sandwiched between the side surfaces of the extruded profile members facing each other, and a concave portion is formed on the opposing side surfaces of the extruded profile members. The concave portion clamps the end of the rod-shaped fin with the concave portion formed on the opposing side surface, and in the clamped state, between the end portion and the wall of the concave portion and between the opposing side surfaces. A heat sink, wherein the rod-shaped fins are joined to the base plate by solder or brazing material that is densely filled in the gap. 3. A heat sink comprising a base plate having a number of plate-like fins erected at right angles to the surface thereof, wherein the base plate has a plurality of block-shaped extruded members whose side surfaces face each other. The plate-like fins are sandwiched at the ends by opposing side surfaces of the extruded profile, and there is a gap without the plate-like fins between the opposing side surfaces. The heat sink, wherein the plate-like fins are joined to the base plate by solder or brazing material that is densely filled in the gap. 4. A heat sink comprising a base plate having a large number of rod-shaped fins standing upright at right angles to the surface thereof, the plate-shaped extruded shape having a rib in the thickness direction near an end. A plurality of materials are overlapped via a rib and are joined to each other by a solder or a brazing material, and the solder or the brazing material is densely packed in a gap formed by an adjacent extruded shape and the rib. The base plate is formed of a joint portion of the extruded shape member with the solder or brazing material, and a portion of the extruded shape member opposite to the joint portion with respect to the rib is formed in a comb shape. And one of the comb-shaped portions 1
A heat sink, wherein the book is the rod-shaped fin. 5. A method for manufacturing a heat sink comprising a plurality of rod-shaped fins standing upright on a base plate at right angles to the surface thereof, wherein a plurality of through holes are formed in the base plate. The end of each rod-shaped fin is formed in a narrow shape such that a gap is formed between the end of each rod-shaped fin and the wall of the through-hole, and the end of each rod-shaped fin is inserted into each of the through-holes of the base plate. A heat sink characterized by immersing the through hole of the base plate in a molten solder or a molten brazing material, filling the gap with the solder or the brazing material by applying ultrasonic vibration, and joining a rod-shaped fin to the base plate. Manufacturing method. 6. A method for manufacturing a heat sink comprising a plurality of bar-shaped fins standing on a base plate at right angles to a surface thereof, wherein the base plate comprises a plurality of extruded block-shaped members. The recesses are formed on the opposing sides of the extruded profile, and the ends of the extruded profile are formed by the recesses formed on the opposing sides. The extruded sections are formed in such a shape that the gap is formed between the end portion and the wall of the concave portion and between the opposing side surfaces in the clamped state. And the opposite end of the rod-shaped fin is sandwiched by the opposed concave portions,
In that state, the concave portion of the extruded shape is immersed in a molten solder or a molten brazing material, and the gap is filled with the solder or the brazing material by applying ultrasonic vibration to join the rod-shaped fin to the base plate. A method for manufacturing a heat sink characterized by the following. 7. A method for manufacturing a heat sink comprising a plurality of plate-like fins standing upright on a base plate at right angles to the surface thereof, wherein the base plate comprises a plurality of extruded block-shaped members. The extruded profiles are juxtaposed with their side surfaces facing each other, and the extruded profiles are arranged side by side with their side surfaces facing each other. By sandwiching the gap so that a gap without a plate-like fin is formed between the mating side surfaces, the gap is immersed in a molten solder or a molten brazing material in this state, and the above solder or brazing is applied to the gap by applying ultrasonic vibration. A method of manufacturing a heat sink, comprising filling a material and joining a rod-shaped fin to a base plate. 8. A method for manufacturing a heat sink comprising a plurality of bar-shaped fins standing upright on a base plate at right angles to a surface thereof, comprising: a rib in a thickness direction near an end portion; A plurality of plate-shaped extruded members having a comb-shaped portion opposite to the end portion with respect to the end portion are overlapped with each other via a rib. The portion of the gap constituted by the ribs is immersed in the molten solder or the molten brazing material, and by applying ultrasonic vibration, the solder or the brazing material is filled in the gap and the extruded members are joined to each other. A method for manufacturing a heat sink.