JP2704241B2 - heatsink - 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 for cooling semiconductors and electronic equipment.

[0002]

2. Description of the Related Art There are various types of such heat sinks. For example, in the type shown in FIG. The protruding wall portions 24 are formed at appropriate intervals on one of the metal plates 17, and one end of the fin 19 is inserted into the groove 18 formed by the protruding wall portion 24. The fin 19 is fixed to the metal plate 17 by caulking the portion 24 to both sides of the fin 19, and the other end of the fin 19 is inserted into a groove 20 formed in another metal plate 21. Then, the opposed metal plates 17 and 21 are connected to each other with screws 23 via side plates 22.

[0003]

Since the fins 19 are fixed to the metal plate 17 by caulking the protruding wall portions 24 on both sides of the fins 19, as shown in FIG. The heat conductivity between the metal plate 17 and the fins 19 is low.

It is possible to fix the fin 19 to the metal plate 17 by pressing only the protruding wall portion 24 on one side of the fin 19 to the fin 19 side.
If only the protruding wall portion 24 on one side is pressed, the protruding wall portion 24 on the other side may be deformed and cannot be securely fixed.

[0005] In this case, the other side of the fin 19 to which the protruding wall portion 24 is not pressed is supported by the groove 18 immersed in the metal plate 17. Since the height of the clamping position is different from that of the part 24, the fin
The contact area between 19 and the metal plate 17 is also reduced,
Tying is also difficult.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and even when only one side of the fin is fixed to the substrate by caulking, the contact area between the fin and the substrate can be increased and the thermal conductivity can be reduced. It is another object of the present invention to provide a heat sink which can be increased and which can be easily fixed by caulking and which can surely prevent the fins from being detached after fixing.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a semiconductor device, comprising: a plurality of fin insertion grooves formed at intervals on a substrate; The fins are formed side by side, and the protruding wall formed between the fin insertion grooves and the grooves is deformed toward the fins to be inserted into the fin insertion grooves of the substrate, and the fins are caulked to the substrate. The gist is that a groove is formed at the base of the protruding wall on the fin insertion groove side, and a protrusion is formed on the fin insertion groove at the upper end of the protruding wall.

[0008]

According to the first aspect of the present invention, the entire length of the protruding wall portion is deformed toward the fin by making the depth of the groove forming the protruding wall portion greater than the depth of the fin insertion groove. As a result, the entire surface of the portion where the fin is inserted into the insertion groove is in close contact with the substrate, and the heat conduction efficiency is increased.

According to the second aspect of the present invention, in addition to the above operation, the groove formed on the base of the protruding wall facilitates bending of the protruding wall toward the fin.

According to the third aspect of the present invention, in addition to the above operation, in a state where the protruding wall is deformed toward the fin, the protruding ridge at the upper end of the protruding wall bites into the fin. Detachment from the substrate is reliably prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing a first embodiment of a heat sink according to the present invention, and FIG. 2 is a vertical sectional front view of a main part of the heat sink according to the first embodiment. The heat sink according to the present invention comprises a substrate 1 and a number of fins 2.

The substrate 1 is provided with a cooling surface for mounting a heating element on its outer surface. The substrate 1 is formed by extrusion from a metal material having good heat conductivity, such as aluminum, an aluminum alloy, or copper, and is formed at intervals. Forming a large number of fin insertion grooves 3,
Fin insertion groove 3 adjacent to and adjacent to this fin insertion groove 3
The groove portions 4 immersed in the substrate 1 were arranged side by side at the center between them.

The depth of the groove 4 is formed to be greater than the depth of the fin insertion groove 3, and the projecting wall 5 is formed by the adjacent fin insertion groove 3 and the groove 4 formed therebetween. Form. A small groove 6 was formed at the base of the protruding wall 5 on the side of the fin insertion groove 3, and a protrusion 7 was formed on the upper end of the protruding wall 5 on the side of the fin insertion groove 3.

The fins 2 are made of aluminum,
It was formed of a metal material having good heat conductivity such as aluminum alloy and copper, and was formed in a flat plate shape. Note that the height of the fins 2 is determined by the required thermal performance.

FIG. 3 shows a pressing jig as a pressing device for fixing the fin 2 to the substrate 1 by caulking. The pressing jig 8 includes, as an example, a drawing jig 9 and FIGS.
The plug jig 10 and the guide jig 11 are combined with the plug jig 10 and the guide jig 11 as shown in FIG.

The plug jig 10 has an upper end surface fixed to the extraction jig 9 formed on a pressing surface 10a.
a is a ridge, and the pressing surface 10a is formed as an inclined surface whose diameter gradually increases from the base to the tip. Note that a groove-shaped notch 10b may be formed in the pressing surface 10a in order to reduce resistance during use. As shown in FIG. 10, the guide jig 11 has a ridge 11a protruding from the lower end surface as an example.

FIG. 5 shows a fin fixture for fixing the fin 2 to the substrate 1 when the heat sink is for one-side cooling and the substrate 1 is fixed to only one end of the fin 2. The fixture 12 forms a fin support groove 13 on the upper surface of the base 12a and a passage groove 14 of the guide jig 11 adjacent to the fin support groove 13. In this case, the substrate 1 and the fin fixture
In a state in which the fin insertion groove 3 faces the fin insertion groove 3 formed in the substrate 1 and the fin support groove 13 formed in the fin fixture 12, the groove 4 and the passage groove 14 face each other.

It is desirable that the shape of the passage groove 14 conforms to the shape of the guide jig 11 in order to facilitate the passage of the guide jig 11.

Next, a method of manufacturing the heat sink will be described. First, as shown in FIG. 6, the substrate 1 and the fin fixture 12 are placed at opposing positions.
The two ends of the fin 2 are inserted between a large number of fin insertion grooves 3 and fin support grooves 13 formed on the respective opposing surfaces, and in this state, the upper and lower substrates 1 and the fin fixture 12 are restrained by appropriate jigs. I do. Next, using a suitable insertion device (not shown), the part of the pulling jig 9 of the pressing jig 8 is inserted between the adjacent fins 2 in the direction of arrow A, and the part of the plug jig 10 is pulled out. It is located on the opposite side of the direction.

Thereafter, the restraint by the insertion device is released, and the pull-out jig 9 is pulled in the direction of arrow A by another pull-out device.
The plug jig 10 is passed along the groove 4. At this time,
Since the guide jig 11 passes through the passage groove 14, the pull-out direction of the pressing jig 8 is restricted, and the plug jig 10 does not come off the groove 4.

When the plug jig 10 passes through the groove 4, the pressing surface 10a formed so as to widen from the base end to the tip of the plug jig 10 pushes the groove 4 to both sides, and 5 is deformed toward the fin 2 inserted into the fin insertion groove 3 of the substrate 1, and the fin 2 is crimped to the substrate 1.

In this case, the depth of the groove 4 is
7, the entire length of the protruding wall portion 5 can be deformed toward the fin 2 as shown in FIG.
The entire surface of the fin 2 to be inserted into the fin insertion groove 3 is the substrate 1.
Adhere to

When the projecting wall 5 is deformed in the direction of the fin 2, the groove 6 is formed at the base of the projecting wall 5, so that the projecting wall 5 can be easily caulked to the fin 2 side. Further, in the crimped state, the protruding ridge 7 at the upper end of the protruding wall portion 5 bites into the fin 2, so that the fin 2 is securely fixed to the substrate 1 and is prevented from being detached.

The pressing jig 8 shown in FIG. 3 is used for pulling out in the direction of arrow A in FIG. 6, but when pulling out in the direction of arrow B opposite thereto, it is shown in FIG. A plug jig 10 having a widening direction reversed is used.

FIG. 9 shows another example of the plug jig 10, in which a convex pressing surface 10a is formed in a diameter-enlarging portion which gradually expands in a stepwise manner from its base to its tip.

FIG. 11 shows another example of the guide jig 11, and FIG.
A guide roller 11b can be provided instead of the ridge 11a shown in FIG.

Further, the configuration of the pressing jig 8 is shown in FIG.
2. As shown in FIG. 13, the plug jig 10 can be formed integrally with the extraction jig 9, or as shown in FIGS. 14 and 15, both the plug jig 10 and the guide jig 11 can be combined with the extraction jig 9. The guide jig 11 can be formed integrally with the pull-out jig 9 as shown in FIGS. 16 and 17.

The first embodiment is of a single-sided type in which the substrate 1 is fixed to only one end of the fin 2, but is not limited to this. As shown in FIG. It can also be applied to a double-sided type in which the substrate 1 is fixed to both ends of the fin 2. In this case, the fin fixture 12 becomes unnecessary, and the pressing jig 8 is also provided with plug jigs 10 above and below the drawing jig 9, and the plug jig 10 passes through the grooves 4 of the upper and lower substrates 1. The protruding wall portion 5 is caulked to the fin 2 side.

Since the plug jig 10 is provided above and below the pressing jig 8, the fins 2
At the same time, the groove 4
Can be simultaneously caulked to the adjacent fins 2 on both sides.

[0030]

As described above, in the heat sink of the present invention, the contact area between the fin and the substrate can be increased, so that the heat conductivity increases. Further, even when only one side of the fin is fixed to the substrate by caulking, the caulking can be easily fixed and the fin can be reliably prevented from being detached after fixing.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional front view of a main part of the first embodiment of the heat sink of the present invention.

FIG. 3 is a perspective view of an example of a pressing jig used when manufacturing the heat sink of the present invention.

FIG. 4 is a perspective view of another example of a pressing jig used when manufacturing the heat sink of the present invention.

FIG. 5 is a perspective view of a fin fixture used when manufacturing the heat sink of the present invention.

FIG. 6 is a perspective view showing a state in which a pressing jig of the heat sink of the present invention is pulled out.

FIG. 7 is a longitudinal sectional front view of a main part showing a fin fixed state of the heat sink of the present invention.

FIG. 8 is a perspective view of a plug jig used when manufacturing the heat sink of the present invention.

FIG. 9 is a perspective view showing another example of a plug jig used when manufacturing the heat sink of the present invention.

FIG. 10 is a perspective view of a guide jig used when manufacturing the heat sink of the present invention.

FIG. 11 is a perspective view showing another example of a guide jig used when manufacturing the heat sink of the present invention.

FIG. 12 is a perspective view of another pressing jig used when manufacturing the heat sink of the present invention.

FIG. 13 is a perspective view of another pressing jig used when manufacturing the heat sink of the present invention.

FIG. 14 is a perspective view of another pressing jig used when manufacturing the heat sink of the present invention.

FIG. 15 is a perspective view of another pressing jig used when manufacturing the heat sink of the present invention.

FIG. 16 is a perspective view of another pressing jig used when manufacturing the heat sink of the present invention.

FIG. 17 is a perspective view of another pressing jig used when manufacturing the heat sink of the present invention.

FIG. 18 is a perspective view of a heat sink according to a second embodiment of the present invention in a state where a pressing jig is pulled out.

FIG. 19 is a perspective view showing a conventional example of a heat sink.

FIG. 20 is a longitudinal sectional front view of a main part of a conventional example of a heat sink.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Fin 3 ... Fin insertion groove 4 ... Groove 5 ... Protrusion wall 6 ... Groove 7 ... Protrusion 8 ... Pressing jig 9 ... Pull-out jig 10 ... Plug jig 10a ... Pressing surface 10b ... Cut Notch 11: Guide jig 11a: Protrusion 11b: Guide roller 12: Fin fixing device 12a: Base 13: Fin support groove 14: Passage groove 17: Metal plate 18: Groove 19: Fin 20 ... Groove 21 ... Metal plate 22 ... Side plate 23 ... Screw 24 ... Protrusion

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayasu Kisaragi 5-11-3, Shimbashi, Minato-ku, Tokyo Inside Sumitomo Light Metal Industries Co., Ltd. (72) Inventor Hideo Itagaki 5-3-1, Shimbashi, Minato-ku, Tokyo No. Sumitomo Light Metal Industry Co., Ltd.

Claims (3)

(57) [Claims] A fin insertion groove adjacent to a plurality of fin insertion grooves formed at intervals on a substrate and having a depth not less than the depth of the fin insertion groove and immersed in the substrate; A heatsink wherein a protruding wall portion formed between the groove and the groove is deformed toward a fin inserted into the fin insertion groove of the substrate, and the fin is caulked to the substrate. 2. The heat sink according to claim 1, wherein a groove is formed at a base of the protruding wall on the side of the fin insertion groove. 3. The heat sink according to claim 1, wherein a projection is formed on the upper end of the projection wall on the fin insertion groove side.