JP2011114206A - Fin integrated heat sink - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique wherein, by improving a conventional corrugated fin type heat sink, a top part of each upper side projection being a fin part, does not become plane like before, as a result, wind from an upper part (vertical direction and oblique direction) sufficiently reaches a lower part of the fin part and a fixed part, the board thickness of the fin also obtains the same bending strength as before and is twice the thickness of the conventional corrugated fin, and thereby, the heat sink has the advantage of the heat conventional sink that plate fins are arranged in a substrate in parallel. <P>SOLUTION: In a corrugated fin with such a shape that the upper projection which is a fin part 1 and the lower projection which is a fixed part 2 are alternately formed by bending a plate member, a top part 3 of each upper side projection has a shape formed by a single folding. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat sink for cooling a semiconductor element.

  2. Description of the Related Art Conventionally, as a heat sink for cooling a semiconductor element, a structure in which a large number of plate-like fins 91 are arranged and fixed on a substrate 90 as shown in FIG. As a method of manufacturing this type of heat sink, a method is known in which after fins 91 are fitted in grooves arranged in the substrate 90, the groove walls 92 are caulked to fix the fins 91 and the substrate 90 ( Patent Document 1, FIG. 1, FIGS. 5 to 7).

  As another heat sink, corrugated (pleated) fins are also known. This is because, as shown in FIG. 6, the plate member is appropriately bent by bending, pressing, or the like, so that the upper convex portion that becomes the fin portion 100 and the lower convex portion that becomes the fixing portion 101 are alternately formed. (Hereinafter, the fin having this shape is also referred to as “corrugated fin”). As a method of manufacturing this type of heat sink, a method of brazing corrugated fins and fixing them onto the substrate 103, or a method of fixing corrugated fins by pressing them against the substrate is used (Patent Document 2, FIG. 5). To paragraphs 7, 0004 and 0005).

Japanese Patent No. 2715890 (FIGS. 1 and 5 to 7) Japanese Patent No. 3602806 (paragraphs of FIGS. 5 to 7, 0004, 0005)

  For the former heat sink, that is, in a form in which a large number of plate-like fins 91 are arranged and fixed to the substrate 90, it is not necessary to bend the fin body, but the plate-like fins 91 are all attached. It must be inserted and fixed into the groove of the substrate one by one, which takes time. Further, when the fin 91 is fixed to the substrate 90, it is necessary to apply a large load in order to caulk the groove wall portion 92, and there is a problem that capital investment for that purpose is increased.

  On the other hand, for the latter heat sink, that is, a corrugated fin composed of a plurality of fin portions 100 and a fixed portion 101, the top portion 102 of each upper convex portion forming the fin portion is flat and becomes like a roof. Therefore, when heat is radiated from the top (vertical direction or diagonal direction), if the wind is blocked by the flat top 102 and the wind efficiently hits the bottom (below the fin 100 or the fixed part 101) Therefore, the heat dissipation characteristic will be lowered. Similarly, when cleaning by jetting with wind or water, there is a problem that the ceiling part 102 blocks the jet and the jet does not reach, and the fixed part 101 tends to collect dust, and it is difficult to perform regular maintenance. is there. In addition, these fin portions 100 have a property of improving heat dissipation characteristics as the thickness increases, but the plate thickness of the fin 91 can be easily increased with the former heat sink, whereas corrugated fins are used. In the latter heat sink used, if the plate thickness is large, the bending strength must be increased in the step of bending the fin portion 100, and there is a problem that the cost is increased.

  The present invention was devised in view of the above problems of the prior art, and by improving the conventional corrugated fin type heat sink, it solves the problems that it has and arranges the conventional plate fins on the substrate. The present invention intends to provide a technology that also has the advantage of a heat sink that is installed and fixed.

  For this reason, the fin-integrated heat sink according to the present invention is a corrugated shape in which a plate member is bent and an upper convex portion serving as a fin portion and a lower convex portion serving as a fixing portion are alternately formed. In the fin, the top portion of each upper convex portion has a shape that is formed by one turn.

  Each upper convex part which becomes a fin part of the present invention has a shape that is formed by one turn, and the top part of each upper convex part is a pointed shape as shown in an embodiment described later. Therefore, the wind from above reaches the lower part of the fin part and the fixed part sufficiently.

  As described above, according to the fin-integrated heat sink according to the present invention, the top portion of each upper convex portion that is a fin portion does not have a planar shape as in the prior art, so that it is from above (vertical direction or oblique direction). The wind reaches the lower part of the fin part and the fixed part sufficiently, so that the heat radiation characteristic is improved and the maintenance of the fixed part and the accumulation of dust can be prevented. In addition, the plate thickness can be the same bending strength as the conventional one, a thickness twice that of the conventional corrugated fin can be obtained, and the heat dissipation characteristics can be improved.

An example of the fin according to the present invention is shown, (a) is a front view, and (b) is a perspective view. It is a front view which shows the state attached to the rectangular parallelepiped board | substrate of the example of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a state in which an embodiment of the present invention is caulked to a substrate, (a) is a perspective view before caulking this embodiment to the substrate, and (b) is after caulking this embodiment to the substrate. FIG. FIG. 4 shows another embodiment of the present invention, where (a) is a front view and (b) is a perspective view. It is a figure which shows the heat sink which arranged and fixed the conventional plate-shaped fin on the board | substrate, (a) is a front view, (b) is a perspective view. It is a figure which shows the state which attached the conventional corrugated fin type heat sink to the board | substrate, (a) is a front view, (b) is a perspective view.

  An example of a specific embodiment of the invention according to the present application will be described with reference to the drawings. The corrugated fin and substrate shown below assume aluminum as a material, but if it is a deformable material shown in the form example and is a material having excellent heat dissipation characteristics as a heat sink, even a metal such as copper or magnesium, Other materials may be used. The following embodiment is merely an example, and it is natural that the invention according to the present application is not limited to the following embodiment.

  FIG. 1 shows one embodiment of the fin according to the present invention, where (a) is a front view and (b) is a perspective view. Reference numeral 1 denotes a fin portion (upper convex portion), 2 denotes a fixed portion (lower convex portion), and 3 denotes a top portion of the fin portion. Since the fin according to the present invention is an improvement over the conventional corrugated (pleated) fin, the following description will be given based on the conventional form shown in FIG.

  As shown in FIG. 6, the base form of the present embodiment is formed by bending the plate member and alternately forming the upper convex portion that becomes the fin portion 100 and the lower convex portion that becomes the fixing portion 101. In this embodiment, as shown in FIG. 1, the top portion 3 of each upper convex portion is formed so as to be folded once, and each upper convex portion 1 Are formed so that all of the plate members forming the upper and lower sides overlap (from the top to the base end). For this reason, each upper convex part, ie, the top part 3 of each fin part 1, is in a pointed state as shown in the figure. Such a form can be obtained by a process using a conventional corrugated fin manufacturing process, but may of course be obtained by a process other than that process.

  Further, in the present embodiment, the lower convex portions that serve as the fixing portions 2 are adjacent to each other without a gap, and a horizontal plane having no gap is formed at the bottom of the fin A. Therefore, the fin A can be used as a heat sink by fixing the horizontal surface of the fixed portion 2 directly to the heat radiator. In addition, as shown in FIG. 2, the contact surface may be fixed to a substrate 4 having a flat surface. In the present embodiment, the substrate 4 has a rectangular parallelepiped shape, but the shape is not particularly limited. Any fixing method may be used as long as the fin portion A and the substrate 4 are bonded to each other, such as brazing, solder, adhesive tape, or adhesive. Further, as described below, the present embodiment may be a heat sink that is attached to the substrate by caulking.

  FIG. 3 shows an embodiment in which the heat sink according to this embodiment is caulked on the substrate. The fin B has a configuration in which two rows of notches 5 and 6 are formed from the fixing portion 2 of the fin A to the base end portion of the fin portion 1. And the protrusion part 7 and 8 is formed in the board | substrate at the position corresponding to the notch part 5 and 6 of a fin.

  Next, a process of caulking the fin B to the substrate is shown. First, as shown in FIG. 3 (a), the protrusions 7 and 8 of the substrate are inserted into the notches 5 and 6 of the fin B, and then, as shown in FIG. The protrusions 7 and 8 sandwiched between them are crushed from above, and are caulked to the edges of the notches 5 and 6 to form caulking portions 9 and 10, and the fin B is attached to the substrate 4.

  Further, as shown in FIG. 4, when the embodiment shown in FIG. 1 is caulked to the substrate 4 as shown in FIG. 4, the fin base end portion may be widened so that a slight gap is generated. Even in such a fin C, the top part of each upper part is the same as that of the above-described embodiment in that the top part of each upper convex part is formed by a single turn, so that the top part 3 of each fin part 1 is pointed as shown in the figure. Thus, the effect of the present invention can be obtained. As shown in FIG. 4B, the heat sink according to the present embodiment is formed by inserting the protrusions 11 of the substrate 4 between the fixing portions 2 of the fins C.

  According to such a fin-integrated heat sink according to this embodiment, since the plane of the ceiling portion 102 of the corrugated fin-type heat sink has been eliminated, the upper (vertical direction or The wind from the oblique direction) can reach the lower part of the fin part 1 and the fixed part 2 sufficiently, so that the heat radiation characteristics can be maintained, and dust can be prevented from collecting in the fixed part 2, and the maintenance can be facilitated. Further, as in the case of the fin A, if the fin portion 1 is formed so that the plate members overlap each other from the top portion 3 to the fin base end portion in the vertical direction, not only the fixed portion 2 but also between the plate members. It is possible to prevent the accumulation of dust and facilitate the maintenance of the portion. And since the plate thickness also uses the conventional long plate member and has a structure in which they are double stacked, the thickness is twice that of the conventional corrugated fin without increasing the bending strength. Can be obtained, and heat dissipation characteristics can be improved.

  In addition, since the fixing portion 2 is flat and has almost one surface, the fin 4 can be used as a heat sink without providing the substrate 4, and can be used as a heat sink by using the fin alone. Since C is integrated, the fins A to C can be bonded to the substrate 4 at a time or inserted into the grooves of the substrate 4, and it does not take time. The load when the fins A to C are caulked and fixed can also be reduced as compared with the caulking of the groove wall portion 92 of the substrate 90.

  As described above, the invention according to the present application is not limited to the above-described embodiment. For example, the fins A to C may be in other forms, and the fin portion 1 and the fixing portion 2 The number, size, etc. can be changed as appropriate. Further, in the case of a heat sink in which fins are fixed to the substrate 4 by bonding, caulking, etc., the fins and the substrate may be in a corresponding shape.For example, a groove is formed in the substrate, and the fin is fitted into the groove. Of course, the shape of the fin fixing portion may be matched to the shape of the groove as long as it is configured to match.

A ~ C Fin
1 Fin part (upper convex part)
2 Fixed part (lower convex part)
3 Top
4 Board
5,6 Notch
7,8 ridge
9,10 Caulking section
11 ridge

Claims (1)

  In the corrugated fin having a shape in which the plate member is bent and the upper convex portion serving as the fin portion and the lower convex portion serving as the fixing portion are alternately formed, the top portion of each upper convex portion is once A fin-integrated heat sink having a shape that is formed by folding.

Images