JPH1117080A - Radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiator which can be inexpensively manufactured with a good productivity and can have radiating fins provided with a high density. SOLUTION: In a radiator 1 having a plurality of radiating fins 3 and 4 of thin plate members erected on a substrate 2, the fins 3 and 4 are joinedly brazed onto an upper flat surface of the substrate 2. Since the radiator 1 can be manufactured with relatively simple steps, its productivity can be high. Further the radiating fins 3 and 4 can be provided with a high density. Thus, when the fins 3 are made to have an L-shaped section, the fins 3 can be joined to the substrate 2 with a high strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator which is attached to a heating element such as a semiconductor element to dissipate heat generated in the heating element to the outside.

[0002]

2. Description of the Related Art Generally, a radiator for dissipating heat generated in a heating element such as a semiconductor element to the outside has a structure in which a radiating fin is provided on a base plate (substrate). The base plate and the base plate are manufactured separately, and they are joined together, or the radiating fin and the base plate are extruded integrally, the radiating fin is cut and raised on the surface of the extruded mold material, and ground with a multi-wire saw There is an example in which the heat radiation fin and the base plate are integrally formed by processing. Among these radiators, a radiator disclosed in Japanese Utility Model Laid-Open Publication No. 2-58342 and the like is conventionally known as one in which the radiating fin and the base plate are formed separately.

In the radiator disclosed in Japanese Utility Model Application Laid-Open No. 2-58342, a mounting groove for mounting a radiation fin is formed on a base plate, and a root portion of the radiation fin is fitted into the mounting groove. The base plate and the radiating fins are integrally joined by caulking the same portion, and have been developed for the purpose of improving mass productivity.

[0004]

In recent years, in the field of semiconductor devices, the degree of integration has been increased, and the price has been remarkably reduced due to mass production and the cost has been reduced. Therefore,
Naturally, the radiator used for this purpose is required to further improve the productivity and to reduce the price.

[0005] However, the aforementioned Japanese Utility Model Application Laid-Open No. 2-58342.
In the radiator disclosed in Japanese Patent Application Laid-Open Publication No. H11-157, the radiating fins must be applied to the mounting grooves one by one in order to fit the radiating fins into the mounting grooves, and the fins must be pushed into the mounting grooves. However, the production efficiency is not always high. Further, the pressing body is inserted between the radiation fins fitted in the mounting grooves, and the fitting portion is caulked by the pressing body. However, when the interval between the radiation fins is narrow, the pressing body is securely inserted between the radiation fins. It is not easy to insert it into the device, and the production efficiency is low in this respect as well. Also, if the spacing between the radiating fins becomes narrow, the thickness of the pressing body inserted between the radiating fins must be reduced, and the strength of the pressing body that can withstand caulking cannot be obtained. There is also a disadvantage that it cannot be provided for

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a radiator which has good productivity, is inexpensive, and can be provided with radiating fins at high density.

[0007]

According to a first aspect of the present invention, there is provided a radiator having a plurality of radiating fins formed of a thin plate member, the radiator being provided on a substrate. Brazing the radiation fins to the upper surface of the substrate,
It is characterized by joining both.

[0008] Such a radiation fin is formed, for example, by appropriately applying a brazing material to the upper surface of the substrate by melting, forming the radiation fin into an appropriate shape, and then placing the radiation fin on the substrate at a predetermined interval. Thereafter, the brazing material applied on the upper surface of the substrate is melted again and the radiation fins are brazed on the substrate.

According to the first aspect of the invention, since the radiator can be manufactured by a relatively simple process, the productivity of the radiator can be improved. Further, there is no limitation on the interval at which the heat radiation fins are provided, and the interval can be set freely, so that the heat radiation fins can be provided at a high density. Further, since the members are joined by brazing, the heat conductivity is good, and the radiator obtained has excellent heat radiation.

According to a second aspect of the present invention, in the first aspect of the present invention, the radiating fin is formed of a thin plate member having an L-shaped cross section including a vertical side and a horizontal side, and the horizontal side is formed on the upper surface of the substrate. The heat radiation fin and the substrate are joined by brazing.

According to the present invention, since the horizontal sides of the heat radiation fins having an L-shaped cross section are brazed to the upper surface of the substrate, the area to be brazed can be increased, and the heat radiation fins and the substrate can be formed with high strength. Can be joined. Therefore, it is possible to prevent the inconvenience that an external force acts on the radiator when the radiator is handled and the radiator fin is detached from the substrate.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing the entire radiator according to the present embodiment, and FIG. 2 is a side view in the direction of arrow A in FIG.

As shown in FIGS. 1 and 2, this radiator 1
Is a rectangular substrate 2 having flat upper and lower surfaces;
The first radiating fin 3 is composed of a first radiating fin 3 and a second radiating fin 4 erected on the top, and the first radiating fin 3 is formed by bending a flat rectangular thin plate member by a press device. The second radiating fin 4 is formed of a flat rectangular thin plate member having an L-shaped cross section having a side 3a and a horizontal side 3b.

The first radiating fins 3 are erected on the substrate 2 so that the horizontal sides 3b are in contact with the upper surface of the substrate 2, and the second radiating fins 4 are connected to the lower end of the substrate 2 The first heat radiation fins 3 and the second heat radiation fins 4 are joined to each other by brazing the respective contact portions on the substrate 2 so as to be in contact with the upper surface.

In the radiator 1, the first radiating fins 3 are disposed so that the first radiating fins 3 are opposite to each other with the second radiating fins 4 interposed therebetween. This is to form as many radiating fins as possible on the substrate 2 to increase the radiating efficiency.

The material constituting the substrate 2, the first radiating fins 3 and the second radiating fins 4 is not particularly limited, and may be, for example, aluminum, aluminum alloy, copper, copper alloy or the like. One having excellent conductivity can be given as an example.

The radiator 1 having the above configuration can be manufactured as follows.

That is, first, a brazing filler metal is appropriately applied to the upper surface of the substrate 2 while the first radiating fins 3 and the second radiating fins 4 are formed in the above-described shape. Then, for example, using a comb-shaped jig provided with supporting claws at predetermined intervals, the vertical side 3b of the first radiating fin 3 and the second radiating fin 4 are inserted between the supporting claws, and the jig is used. The first radiating fins 3 and the second radiating fins 4 are supported so that the first radiating fins 3 and the second radiating fins 4 are in the above-described state at predetermined intervals, and the first radiating fins 3 and the second radiating fins 4 are mounted on the substrate 2. Place. Thereafter, the substrate 2, the first radiating fins 3 and the second radiating fins 4 are put into the furnace together with the jig, and the brazing material applied to the upper surface of the substrate 2 is melted again, so that the upper surface of the substrate 2 and the first radiating fins The space between the lower surface of the horizontal side 3a of the fin 3 and the lower end surface of the second radiating fin 4 is brazed.

The radiator 1 thus manufactured is attached to the heat source by clips, screws, or the like such that the lower surface 2a contacts a heat source such as a semiconductor.

According to the radiator 1, since the horizontal side 3b of the first radiating fin 3 having an L-shaped cross section is brazed to the upper surface of the substrate 2, a large area for brazing can be obtained. The first radiation fins 3 and the substrate 2 can be joined with high strength. On the other hand, the lower end surface of the second radiating fin 4 has a smaller area than the lower surface of the horizontal side 3b.
Is provided so as to be sandwiched between the side end surfaces of the horizontal side 3b, and a brazing material is formed by capillarity in a gap between the second heat radiation fin 4 and the end surface of the horizontal side 3b during brazing. Penetrates and the portion is brazed, so that the second radiating fins 4 are also joined to the upper surface of the substrate 2 with high strength. As described above, since both the first radiating fin 3 and the second radiating fin 4 are joined to the upper surface of the substrate 2 with high strength, an external force acts during handling of the radiator 1 so that the first radiating fin 3 is provided. The inconvenience that the third and second heat radiation fins 4 come off the substrate 2 can be prevented.

In the radiator 1, the first radiating fins 3 and the second radiating fins 4 are arranged at predetermined intervals on the substrate 2
Although a jig is required to place the radiator on the radiator 1, the overall process is relatively simple, so that the productivity is high and the radiator 1 can be manufactured at low cost. In addition, by changing the length of the horizontal side 3b of the first radiating fin 3, it is possible to easily change the installation pitch of the radiating fins. Yes, and as shown in FIG.
In order to provide the mounting hole 5 for the heat source, the horizontal side 3b of the same portion may be elongated to widen the interval between the radiation fins. Further, since the members are joined by brazing, the heat conductivity is good and the heat dissipation is excellent.

Although a specific embodiment of the present invention has been described above, it is needless to say that the possible modes of the present invention are not limited to this. Is slightly reduced,
It may be composed of only the first heat radiation fins 3 or may be composed of only the second heat radiation fins 4 if the joining strength of the heat radiation fins does not matter.

As shown in FIG. 4, a plurality of sets of radiating fins arranged so that the first radiating fins 3 are opposite to each other with the second radiating fins 4 interposed therebetween are provided. You may comprise. By doing so, it is possible to reduce the number of first radiating fins 3 that need to be bent while keeping the joining strength high, and it is possible to further improve the productivity of the radiator 1.

Also, according to the shape of the heat source to be attached,
The lower surface 2a of the substrate 2 can be appropriately processed.

[0025]

As described in detail above, claim 1 of the present invention
According to the invention, the radiator is brazed to the upper surface of the flat substrate and the two are joined, so that the radiator can be manufactured by a relatively simple process, and the productivity of the radiator can be reduced. Can be enhanced. Further, there is no limitation on the interval at which the heat radiation fins are provided, and the interval can be set freely, so that the heat radiation fins can be provided at a high density. Further, since the members are joined by brazing, the heat conductivity is good, and the radiator obtained has excellent heat radiation.

According to the second aspect of the present invention, since the horizontal side of the heat radiation fin having an L-shaped cross section is brazed to the upper surface of the substrate, a large area for brazing can be obtained. And can be joined with high strength. Therefore, it is possible to prevent such a disadvantage that the radiation fin is detached from the substrate due to an external force acting during the handling of the radiator.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire radiator according to a specific embodiment of the present invention.

FIG. 2 is a side view in the direction of arrow A in FIG.

FIG. 3 is a side view showing a radiator according to a modification.

FIG. 4 is a side view showing a radiator according to a modification.

[Description of Signs] 1 radiator 2 substrate 2a lower surface 3 first radiator fin 3a vertical side 3b horizontal side 4 second radiator fin 5 mounting hole

Claims (2)

[Claims] 1. A radiator comprising a plurality of radiating fins formed of a thin plate member erected on a substrate, wherein the radiating fins are brazed to the flat upper surface of the substrate, and the two are joined together. vessel. 2. The heat radiation fin is formed of a thin plate member having an L-shaped cross section composed of a vertical side and a horizontal side, and the horizontal side is brazed to the upper surface of the substrate to join the heat radiation fin to the substrate. The radiator according to claim 1, wherein: