JP2003086743A - Heat sink and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink wherein coupling between fins is improved and the efficiency is high while preventing bending of a base, and coming-out of the fins is not generated, by using a bending stress of the base when fins are forcibly inserted at the same time into the base, avoiding the bending stress which is generated in the case of insertion by coupling parts of plural fins, and turning the stress into mutual coupling between mutual fins. SOLUTION: The heat sink is constituted of a base surface on which heating elements are fixed, and a plurality of fins for dissipating heat from the base surface, and is assembled by forcibly inserting the fins into the base. An uneven part for coupling mutually the fins is formed in the fins, which are mutually coupled by using the coupling parts and forcibly inserted into the base. As a result, the bending stress which is generated when the fins are forcibly inserted into the base is turned into a tensile force between mutual fins in the coupling parts, thus increasing the coupling force between mutual fins and the coupling force between the fins and the base.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention finds application in heat sink assembly for cooling semiconductors.

[0002]

2. Description of the Related Art A conventional press-fitting type heat sink has a base surface on the side to be press-fitted when press-fitting a convex or concave portion of a fin made of aluminum or copper into a corresponding concave-convex portion of a base. Bending occurs on the opposite side of the base due to the increase in volume, and it was difficult to join several fins to the base at one time due to this bending when the press-in tolerance was increased to secure the connection. However, when the press-fitting tolerance was reduced, the coupling became uncertain, the fins were omitted, and the heat dissipation performance of the heat sink was significantly reduced.

[0003]

SUMMARY OF THE INVENTION The present invention utilizes the bending stress of the base that occurs when the fins are pressed into the base simultaneously, and prevents the bending stress that occurs when the fins are connected to each other at the joint portion of the fins. By changing the connecting force between the fins, the bending of the base can be prevented, the connecting force between the fins can be increased, and an efficient heat sink with no fins removed can be provided at a low price.

[Means for Solving the Problems]

The present invention comprises a base surface for mounting a heating element and a plurality of fins for radiating heat from the base surface,
In a heat sink assembled by press-fitting the fins into the base, the fins are provided with concavo-convex portions that connect the fins to each other, and the fins are connected to each other by the connecting parts to press-fit the base. A method for assembling a heat sink and a heat sink, characterized in that bending stress of the base generated when press-fitting the base into the base is converted into a tensile force between the fins at the connecting portion to increase the binding force between the fins and between the fin and the base. Is.

The present invention comprises a base surface for mounting a heating element and a plurality of fins for radiating heat from the base surface,
In the heat sink assembled by press-fitting the fins into the base, the heat sink is characterized in that the fins are formed with uneven portions that connect the fins to each other.

According to the present invention, it is possible to provide a heat sink which is free from fins and is inexpensive and has a high cooling efficiency.

[0006]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a conventional press-fit type heat sink, in which a fin (2) made of an extruded material and a base (1) to which a heating element is attached have a convex portion (3) provided on the fin as a concave portion of the base (1). It is pressed in and combined. The connecting convex portion (3) provided on the fin is located between the adjacent fins so as to be easily located under the connecting jig so as to easily receive the pressure of the jig during press fitting. It is located at If the connecting convex portion is not located between the fins, sufficient pressure is not applied to the connecting convex portion, so that a large press-fitting tolerance cannot be provided in the press-fitting, and there is a risk of fin dislodgement. FIG. 2 is a press-fitting method of the conventional press-fitting type heat sink. As shown in FIG. 2A, fins are pressed into the base one by one using a jig, and FIG. FIG. 3 is an enlarged view of the press-fitted portion of the fin and the base. When the convex-shaped portion (3) provided on the fin is press-fitted into the concave-shaped portion (4) of the base, the press-fitting tolerance difference is widened. (1) is bent in the direction opposite to the press-fitting side, so that the connecting groove (4) provided in the base is displaced from the position of the convex portion of the bent fin, and several fins are provided. Make it difficult to press in at once.

FIG. 3 shows a heat sink according to the present invention. The heat sink is composed of a base (6), fins (5) and fins (8), and the fins (8) are press-fitted into the final joint of the heat sink. It is a fin to be.
FIG. 4 (c) shows a front view of the fin (5). This fin has a convex portion (1) press-fitted into the base and a convex portion (1) so that the fins can be connected in the horizontal direction.
0) and the concave portion (11) having a width t1 is made larger than the corresponding convex portion t (e).
As shown in FIG. 3, a plurality of press-fitting portions (7) and (12) can be connected horizontally, as shown in FIG. 3, with fins press-fitted to the end of the heat sink according to the present invention. This prevents the fins from falling off at the end. The groove t3 provided in the fin (8) is almost the same as t1.

FIG. 6 (e) is a view of the fin group to which the heat sink is connected, before the base is press-fitted. FIG. 5 shows a method of press fitting a heat sink according to the present invention. Figure (f) is a view just before press fitting of the heat sink, and figure (g) shows a view after press fitting. By pressing the fins (5) and fins (8) into the base (6), The generated force for expanding the base is converted into a coupling force between the fins and is prevented by the coupling portions provided on the fins (5) and (8).

[0009]

According to the present invention, a low cost heat sink can be provided because several fins can be joined at one time.

[Brief description of drawings]

FIG. 1 is a perspective view of a conventional press-fit type heat sink.

FIG. 2A is a diagram showing how fins of a conventional press-fitting heat sink are joined together, and FIG. 2B is a state diagram after the fins of a conventional heat sink are press-fitted into a base.

FIG. 3 is a perspective view of a heat sink according to the present invention.

FIG. 4 (c) heat sink fin diagram according to the present invention (d) fin diagram located at the end of the heat sink according to the present invention (e) immediately before joining the heat sinks according to the present invention

FIG. 5 (f) is a heat sink coupling diagram according to the present invention. FIG. 5 (g) is a coupling state after press-fitting the fins of the heat sink according to the present invention into the base.

[Explanation of symbols]

[Figure 1] 1. Conventional base 2. Conventional fins 3. Convex portion for conventional press-fit connection of fins

FIG. 2 (a) 2. Conventional fins 3 Press-fit connection convex part of conventional fin 4. Conventional base recess Figure (b) 1. Conventional base 2. Conventional fins 3. Convex portion for conventional press-fit connection of fins

FIG. 3. Fins according to the invention 6. Base of the heat sink according to the invention 7. Convex portion for press-fit connection of fin according to the present invention

FIG. 4 (C) 5. Fins according to the invention 7. Convex portion for press-fit connection of fin according to the present invention 10. Convex part for fin connection 11. Recess for fin connection Figure (d) 7. Convex portion for press-fit connection of fin according to the present invention 8. For the ends of fins according to the invention 12. Press-fitting convex portion according to the present invention Figure (e) 5. Fins according to the invention 7. Convex portion for press fitting of fin according to the present invention 8. For the ends of fins according to the invention 9. Heat sink base concave portion according to the present invention

FIG. 5 (f) 5. Fins according to the invention 6. Base of the heat sink according to the invention 7. Convex portion for press fitting of fin according to the present invention 8. For the ends of fins according to the invention

Claims (2)

[Claims] 1. A heat sink comprising a base surface on which a heating element is mounted and a plurality of fins for radiating heat from the base surface. The heat sink is assembled by press-fitting the fins. The uneven shape connects the fins to each other. A part is provided on the fin, and the fins are connected by the connecting part and press-fitted into the base, whereby bending stress of the base generated when the fin is press-fitted into the base is finned by the connecting part. A heat sink assembling method and a heat sink, characterized by increasing the binding force between fins and between a fin and a base by changing the pulling force of the heat sink. 2. A heat sink which comprises a base surface for mounting a heating element and a plurality of fins for radiating heat from the base surface, and is assembled by press-fitting the fins into the base. A heat sink characterized in that the fins are formed on the fins.