JPH0861879A - Radiator - Google Patents

Abstract

PURPOSE: To improve radiating properties by providing an uneven part on the surface of a radiator. CONSTITUTION: A radiator 1 is formed by bending and shaping an aluminum plate which has excellent thermal conductivity, excellent processability such as malleability, ductility, bendability, for example, formed in section substantially in a sine wave shape except a predetermined position in U-shaped shape of the entire section and mounting a power transistor 3 in the state clamped at a predetermined position by a screw 4 and a nut 5. Further, a PCB (printed board) 2 placed with a heat radiating plate 1 mounted with the transistor 3 and connecting the transistor 3 to a circuit is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator formed by bending a sheet metal.

[0002]

2. Description of the Related Art Generally, when a heat-generating element such as a power transistor which consumes a large amount of power is used in an electric circuit, the element is attached to a radiator and mounted on a PCB (printed circuit board) to keep the junction temperature within an allowable value. You need to be careful to keep it down. FIG. 5 shows an example of a radiator made by bending a conventional sheet metal. Reference numeral 10 denotes a radiator, for example, which is formed by bending an aluminum plate into a U-shaped cross section, and uses the power transistor 3 with screws 4, nuts 5, etc., and tightens it at a predetermined position. 2 is equipped with a radiator 10 to which the power transistor 3 is attached,
It is a PCB (printed circuit board) for circuit-connecting the power transistor 3. Conventionally, there is also a heat sink with a fin formed by drawing, but since it is expensive and heavy, it is rarely used by mounting it on a PCB.

The operation of the heat sink of the embodiment shown in FIG. 5 will be described. The heat sequentially generated by the power consumption of the power transistor 3 is a radiator 10 made of aluminum or the like having good heat conduction.
It is transmitted to and diffused. The diffused heat is radiated from the surface of the radiator 10 into the air, propagates, and is cooled (air cooled).

However, a PC equipped with the radiator 10
When B is stored in a thin and compact case, the same radiator 1
There are restrictions on the shape and dimensions such as height and area of 0. Therefore, the surface area of the radiator 10 is reduced, and the amount of heat released by air cooling is reduced. Therefore, good heat dissipation cannot be achieved, and it becomes difficult to maintain the junction temperature and the like of the heating element within the allowable temperature, which causes a malfunction of the element, a shortened life, and a reliability problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a radiator that is compact and low-cost by press working and has high air cooling performance.

[0006]

In order to achieve the above object, in a radiator formed by bending a flat plate member having good thermal conductivity and workability into a required shape, the flat plate member has an uneven portion. Is provided.

[0007]

With the above-mentioned structure, the surface area of the flat member increases due to the irregularities, and the contact area with air increases, thereby improving the air cooling capacity.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A radiator according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a radiator according to the present invention. No. 1 has excellent heat conductivity and excellent workability such as malleability, ductility, and bendability. For example, an aluminum plate whose cross section is processed to have a substantially sinusoidal shape except for a predetermined part is used. It is a radiator that is bent and shaped into a shape, and the power transistor 3 is installed in a state where it is fastened to the predetermined location using screws 4, nuts 5 and the like. Reference numeral 2 is a P for mounting the radiator 1 to which the power transistor 3 is attached and for connecting the power transistor 3 in a circuit.
CB (printed circuit board).

The heat sink operation of the radiator according to the present invention will be described with reference to FIG. In the radiator 1 shown in FIG. 1, a power transistor 3 tightened in a close contact state is attached to a flat plate-shaped predetermined portion, and heat is sequentially generated by power (Pc) consumed by the power transistor 3. The radiator 1 is made of a flat plate member such as aluminum having good heat conductivity, and is formed by press working so as to have, for example, unevenness having a substantially sinusoidal cross section. By comparison, the surface area is increasing. The heat generated by the power transistor 3 is transmitted to the radiator 1 and diffused throughout the radiator 1. Further, the diffused heat propagates from the entire surface of the radiator 1 into the air and is cooled.

The uneven shape of the flat plate member formed by pressing is not limited to a substantially sinusoidal cross section, and for example, even if the cross section has a substantially triangular wave shape, as shown in FIG.
As shown in the external view of (a) and the cross-sectional view of (b), even if the cross-section has a substantially rectangular wave shape, as shown in the cross-sectional view of (c) of FIG. It may have a plurality of concavo-convex shapes connected to each other, for example, a strip shape such as a sine wave shape, or a substantially prismatic projection. Further, as shown in the external view of FIG. 3A and the cross-sectional view of FIG. 3B, even if the cross-section is a cut-and-raised shape and two vertically opposed side surfaces are through holes, Further, as shown in the external view of FIG. 4, the protrusions may have a substantially columnar shape, or may have a shape in which they are combined, and both of them have the same action (explanation omitted) as the embodiment of FIG. The effect is obtained.

[0011]

As described above, the present invention provides a radiator that is compact and low-cost by press working and has high air cooling performance. Therefore, when the PCB equipped with the radiator is housed in a thin and small case, the radiator of the present invention has the advantages of preventing malfunction of the heating element, extending the life, and ensuring the reliability of the product.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a radiator according to the present invention.

FIG. 2 is a diagram showing another embodiment of a radiator according to the present invention.

FIG. 3 is a diagram showing another embodiment of the radiator according to the present invention.

FIG. 4 is a diagram showing another embodiment of the radiator according to the present invention.

FIG. 5 is a diagram showing an example of a conventional radiator.

[Explanation of symbols]

 1 heat sink 2 PCB (printed circuit board) 3 power transistor 4 screw 5 nut 10 heat sink

Claims (9)

[Claims] 1. A radiator formed by bending a flat plate member having good thermal conductivity and workability into a desired shape, wherein the flat plate member is provided with an uneven portion. 2. The radiator according to claim 1, wherein the uneven portion provided on the flat plate member has a substantially sinusoidal cross section. 3. The radiator according to claim 1, wherein the uneven portion provided on the flat plate member has a substantially triangular cross section. 4. The radiator according to claim 1, wherein the uneven portion provided on the flat plate member has a substantially rectangular wave section. 5. The radiator according to claim 1, wherein the uneven portion provided on the flat plate-shaped member is a plurality of strips having an uneven shape whose base portion is connected to the flat plate-shaped member. 6. The radiator according to claim 1, wherein the uneven portion provided on the flat plate-shaped member is a projection having a substantially prismatic shape. 7. The radiator according to claim 1, wherein the uneven portion provided on the flat plate-shaped member is a substantially columnar projection. 8. The radiator according to claim 1, wherein the uneven portion provided on the flat plate-like member is formed by cutting and raising a cross-section having a substantially U-shape to form two through side surfaces facing each other in the vertical direction. . 9. The radiator according to claim 1, wherein the flat member is provided with an uneven portion by press working.