JP2010021387A - Heat sink - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, in a heat sink formed by combining conventional plate materials, since a heat radiating portion is thermally segmented, a small heating element is not directly connected to each heat radiating portion, causing the degradation of heat radiation performance. <P>SOLUTION: The heat sink includes a heat radiating fin portion equipped with a heat receiving surface allowing the heating element to be directly attached, which is formed by arranging a plurality of plate materials having a heat receiving portion formed by folding the vicinity of one side at almost right angle, in almost parallel to the thickness direction of the plate materials, and a connecting member which thermally connects the plurality of plate materials while being attached to the back face of the heat receiving surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a heat sink, and more particularly to a heat sink that can efficiently cool a heating element smaller than a heat receiving surface.

    Electronic components such as semiconductor elements mounted on electric and electronic devices such as televisions and DVDs have a high element density, high heat generated by the elements, and if the elements are not effectively cooled, There are problems such as destruction by heat and malfunction. For this reason, various methods for cooling electric / electronic elements (hereinafter referred to as “heating elements”) that require cooling are applied. For example, a method of directly cooling a heat generating element by attaching a cooling body such as a heat sink to the heat generating element is typically known.

  As a method of dissipating the heat of the heat generating element, for example, a heat radiating fin is connected to a heat sink made of a material having excellent heat conductivity such as copper material or aluminum material, the heat of the heat generating element is moved to the heat sink, and air cooling is performed by a heat radiating fan To do. These heat sinks are fixed to a substrate or the like using a fixing member, and are thermally connected to the heating elements.

  By the way, in order to cope with the further increase in the heat generation amount of the heat generating elements in recent years, various ideas for further improving the heat dissipation performance of the heat sink have been made. As a conventional heat sink, as shown in FIG. 11, as shown in FIG. 11, a plurality of members formed by bending the vicinity of two opposite sides of a substantially rectangular plate material at a substantially right angle to form an upper surface portion 7 and a lower surface portion 9 are connected. A heat sink 2 formed in this manner is described.

JP 2005-38985 A

  However, in the heat sink formed by combining conventional plate materials, the lower surface portion 9 (surface on which the heat generating element is attached) of each member is thermally divided. Therefore, when the heat generating elements are small, the lower surface portions of all the members There is a problem that the heat generating element is not directly connected to 9 and the heat dissipation performance is deteriorated. In such a case, connecting the heat generating element and the heat sink via a heat equalizing plate made of a material having excellent thermal conductivity increases the thermal resistance between the respective members and improves the heat dissipation performance. It was difficult.

  The present invention has been made to solve the above-described problems, and in a heat sink in which a plurality of plates are connected to form a heat receiving surface, a heating element having a size smaller than the heat receiving surface is effectively cooled. An object of the present invention is to provide a heat sink that can be used.

In order to solve the above-described problems, a heat sink according to one aspect of the present invention includes a heat receiving portion and a heat radiating portion formed by bending an inner end portion of one side at a substantially right angle along the one side. A plurality of plate members having a heat radiation fin portion provided with a heat receiving surface to which a heat generating element is directly attached, formed by being arranged substantially parallel to the thickness direction of the heat radiating portion, and attached to the back surface of the heat receiving surface, And a connecting member for connecting a plurality of plate members.

  According to this aspect, since the heat generating element is directly connected to the heat receiving surface of the heat sink, the thermal resistance can be reduced, and the heat of the heat generating elements can be reduced by the connecting member attached to the back surface of the heat receiving surface. Since it can move to a heat radiating part, it becomes possible to radiate heat efficiently.

Further, in the heat sink according to another aspect of the present invention, the heat radiating portion has an opening in the vicinity of the back surface of the heat receiving surface corresponding to at least a portion to which the heat generating element is attached, and the connecting member is the opening. It is characterized by being inserted into.

  According to this aspect, the opening is provided in the vicinity of the back surface of the heat receiving surface corresponding to the portion of the plate material to which the heating element is attached, and the connection member is inserted into the opening to integrally connect the respective plate materials. Therefore, the heat of the connection member can be efficiently moved to the heat radiating portion of each plate member, and the heat radiation efficiency can be further improved.

  In the heat sink according to another aspect of the present invention, the connection member further includes a fixing portion for fixing the heat sink to a substrate on which the heating element is mounted.

  The heat sink according to another aspect of the present invention includes a heat generating element for attaching and fixing the heat generating element by inserting the heat receiving part and the connecting member at positions corresponding to the heat receiving part and the connecting member. A fixing member is further provided.

A heat sink according to another aspect of the present invention is a connection for connecting at least one other side other than the one side of the plurality of plate members, respectively, and fixing to the substrate on which the heating element is mounted. A fixing member is further provided.

  ADVANTAGE OF THE INVENTION According to this invention, in the heat sink which connected the several board | plate material and formed the heat receiving surface, even if it is a heat generating element of a size smaller than a heat receiving surface, the heat sink which can be cooled effectively can be provided. .

  Hereinafter, the heat sink of the present invention will be described in detail with reference to the drawings.

  FIG. 1A is a perspective view I and FIG. 1B is a perspective view II showing a first embodiment of a heat sink of the present invention. As shown in FIG. 1A, the inner end portions of two opposing sides of a substantially rectangular plate member 100 are bent at substantially right angles along each side, and at least one of the bent end portions serves as a heat receiving portion 102. Is formed. Further, the other bent end portion 103 and the plate-like portion 105 between the bent end portions function as the heat radiating portion 101. A plurality of the plate members 100 are arranged substantially parallel to the plate-like portion 105, and the heat receiving surfaces 140 for connecting the heat generating elements 20 are formed by aligning the respective heat receiving portions 102 on substantially the same surface.

  On the back side of the heat receiving surface 140, a connecting member 110 that thermally connects the plate members 100 is provided. The connecting member 110 may be a member provided to connect the plate-like portions 105 of the adjacent plate members 100 and to contact the heat receiving portion 102 in order to move the heat of the adjacent plate members 100 to each other. The member which connects the back surface of the heat receiving part 102 which forms the heat receiving surface 140 integrally may be sufficient. Further, the connection member 110 may include a fixing portion 112 for fixing the heat sink 10 to a substrate on which the heat generating element 20 and the like are mounted.

  FIG. 2 is a (a) top view and (b) AA ′ sectional view of a plate member 100 used in the first embodiment of the heat sink of the present invention. As shown in FIG. 2, the plate member 100 has a substantially rectangular opening 104 for inserting the connecting member 110 formed in the vicinity of the back surface of the heat receiving portion 102 so that one side is in contact with the heat receiving portion 102. I have. In addition, the opening 104 is provided with a cut-and-raised piece 106 for locking the connection member 110 on a side perpendicular to the heat receiving portion 102.

FIG. 3A is a perspective view, FIG. 3B is a top view, and FIG. 3C is a cross-sectional view taken along line BB ′ of the connection member 110 used in the first embodiment of the heat sink of the present invention. As shown in FIG. 3, the connection member 110 is provided with a locking portion 114 corresponding to the cut and raised piece 106 provided on the plate member 100. The locking portion 114 may be cut and raised as shown in FIG. Moreover, the latching | locking part 114 should just be a structure which can latch the cut-and-raised piece 106 of the board | plate material 100, and may be a recessed part of a predetermined shape, or a rectangular opening part.

  As shown in FIG. 3B, the connecting member 110 has a shape in which inner end portions of two opposing sides of a plate material having a predetermined thickness are bent along the sides. In addition, the connecting member 110 includes a hole 116 in a surface 110a connected to the back surface of the heat receiving surface 140, and a burring-formed convex portion 118 is formed on the back surface side of the surface 110a. The hole 116 is for inserting the heating element fixing member 120 (see FIG. 1) for fixing the plate member 100, the connecting member 110, and the heating element 20 together. The convex portion 118 may be appropriately provided when necessary to fix each member, such as when a screw is used as the heating element fixing member 120.

  Next, the manufacturing method of the heat sink of this invention is demonstrated using FIG. As shown to Fig.4 (a), the board | plate material 100 mentioned above is arranged in parallel, and the radiation fin part 200 is formed. Next, as shown in FIG. 4B, the connecting member 110 in which the locking portion 114 is formed is inserted through the opening 104 of the plate member 100 in the direction of the arrow X in the figure. The locking portion 114 has a shape corresponding to the cut-and-raised piece 106 provided in the opening portion 104, and is fitted to the cut-and-raised piece 106 by pushing the connecting member 110 into the opening portion 104. Is locked. As the connecting member 110, a member formed by bending the vicinity of two opposing sides of a thick member as compared with the plate member 100 can be used. However, in order to improve thermal conductivity, a rectangular columnar heat transfer block is used. Can also be used. The connection member 110 includes a claw portion 119 for positioning for connection with the heat radiation fin portion 200.

  FIG. 4C is a top view showing a state in which the connection member 110 is locked to the radiating fin portion 200. As shown in the figure, the surface 110 a of the connection member 110 is in thermal contact with the back surface of the heat receiving surface 140 formed by the heat radiating fin portion 200.

  FIG.4 (d) is CC 'sectional drawing in FIG.4 (c). As shown in FIG. 4 (d), the engaging portions 114 of the connection members 110 inserted through the radiating fin portions 200 are fitted with the cut and raised pieces 106 provided on the respective plate members 100, so that the connection members 110. Dropout can be prevented. In addition, since the cut and raised pieces 106 and / or the locking portions 114 have a shape that is easily elastically deformed, a heat sink can be easily formed simply by pushing the connecting member 110 into the radiating fin portion 200. Note that the connecting member 110 may not include the claw portion 119.

  FIG. 5 is a perspective view showing a second embodiment of the heat sink of the present invention. As shown in FIG. 5, the heat sink 30 includes a connecting and fixing member 130 that connects and fixes each plate member 300 on the side 308 facing the side where the heat receiving portion 302 is provided. Further, the connection fixing member 130 includes a fixing portion 132 for fixing the heat sink 30 to a substrate (not shown) on which the heat generating element is mounted. The heat sink 30 can be securely fixed to the substrate in a balanced manner by the fixing portion 112 of the connecting member 110 and the fixing portion 132 of the connection fixing member 130 described above. Note that the hole 226 for fixing the connecting member 110 and the plate member 300 may be provided in at least a part of the plate member necessary for fixing the heating element.

  FIG. 6 is a (a) top view and (b) CC ′ sectional view showing a plate member 300 used in the second embodiment of the heat sink of the present invention. As shown in FIG. 6, the plate member 300 includes a slit 310 on a side 308 to which the coupling fixing member 130 is connected. Further, a cut-and-raised portion 312 that extends in the direction in which the slit 310 extends is provided inside the slit 310. The slit 310 and the cut-and-raised part 312 facilitate the elastic deformation of the plate member 300 and prevent the plastic deformation of the plate member 300 and the connection fixing member 130 when connecting the connecting and fixing member 130 described later to the plate member 300. Can do.

  FIGS. 7A and 7B are (a) a perspective view and (b) an enlarged view of a portion A showing a connecting and fixing member 130 used in the second embodiment of the heat sink of the present invention. As shown in FIG. 7A, the connecting and fixing member 130 has a shape (substantially U-shaped) obtained by bending a rectangular plate material at two locations at substantially right angles. A portion connected to the plate member 300 is provided with a locking slit 134. As shown in FIG. 7B, the locking slit 134 has a locking side 134 a and is connected to the slit 310 of the plate member 300 by locking the cut-and-raised portion 312 of the plate member 300 described above. They can be easily fixed to each other simply by pushing in the locking slits of the fixing member 130.

FIG. 8 is a perspective view showing a third embodiment of the heat sink of the present invention. As shown in FIG. 8, the heat sink 40 includes a plurality of plate members 400, and a larger heat receiving surface 440 is formed as compared with the heat generating element 20. In such a case, the heat generating element 20 is directly connected to a part of the plate material 410 and thermally connected to the other plate material 420 via the connection member 110. That is, a part of the heat of the heating element 20 moves to the heat receiving surface 440 formed by a part of the plate material 410 and then moves to another plate material 420 via the connection member 110 attached to the back side of the heat receiving surface 440. Heat is dissipated. Here, the connection member 110 and the other plate member 420 are in thermal contact with each other by the same member as the heating element fixing member 120 described above, or by a method such as caulking the uneven portions formed on each.

  FIG. 9A is a perspective view showing a fourth embodiment of the heat sink of the present invention, and FIG. 9B is a top view of the plate member 500. As shown in FIG. 9A, the heat sink 50 has a heat receiving surface 540 formed by connecting a plurality of plate members 500 bent in the vicinity of two opposing sides at a substantially right angle. An opening 504 is provided on the back side of the heat receiving surface 540 and the connection member 110 is inserted therethrough. Further, at least one of the sides 508 adjacent to the side where the heat receiving portion is formed is connected to the respective plate members 500, and the connecting and fixing member 130 having the fixing portion 132 for fixing the heat sink 50 to the substrate (not shown). It has.

  Further, as shown in FIG. 9B, the plate member 500 is formed with an opening 504 for inserting the connection member 110 and a cut and raised piece 506 for locking the connection member 110. Further, on the side 508 adjacent to the heat receiving portion 502, a slit 510 and a cut-and-raised portion 512 are formed at a portion to which the coupling fixing member 130 is connected.

  The connecting and fixing member is not limited to the one formed by bending a rectangular plate material, but as shown in FIG. 10, a connecting and fixing member 230 in which a fixing portion 232 and a locking slit 234 are provided on a rectangular plate material. There may be.

  As the plate material and connection member used in the present invention, various materials having good thermal conductivity, for example, plate materials made of aluminum, copper, and alloys thereof can be used. Moreover, iron etc. which were excellent in mechanical strength can be used as a connection fixing member of this invention. The fixing portions formed on the connecting member and the connecting and fixing member are plated with tin or the like so that they can be easily soldered by a reflow furnace or the like.

It is (a) perspective view I and (b) perspective view II which show 1st Embodiment of the heat sink of this invention. It is the (a) top view of the board | plate material 100 used for 1st Embodiment of the heat sink of this invention, (b) It is AA 'sectional drawing. It is (a) perspective view, (b) top view, and (c) BB 'sectional view showing the connecting member 110 used in the first embodiment of the heat sink of the present invention. It is (a), (b) perspective view, (c) top view, (d) CC 'sectional drawing which shows the process of manufacturing the heat sink of this invention. It is a perspective view which shows 2nd Embodiment of the heat sink of this invention. It is (a) top view and (b) CC 'sectional drawing which show the board | plate material 300 used for 2nd Embodiment of the heat sink of this invention. It is the (a) perspective view which shows the connection fixing member 130 used for 2nd Embodiment of the heat sink of this invention, and (b) The enlarged view of the A section. It is a perspective view which shows 3rd Embodiment of the heat sink of this invention. It is the (a) perspective view which shows 4th Embodiment of the heat sink of this invention, (b) The top view of the board | plate material 500. FIG. It is a perspective view which shows the connection fixing member 230 used for the heat sink of this invention. It is a perspective view which shows the conventional heat sink.

Explanation of symbols

10, 30, 40, 50 Heat sink 20 Heating element 100, 300, 400, 410, 420, 500 Plate material 101 Heat radiation portion 102, 302, 402, 502 Heat receiving portion 103 End portion 104, 304, 504 Opening portion 105 Plate-like portion 106 , 306, 506 Cut and raised piece 110 Connection member 110a Surface 112, 132, 232 Fixing portion 114 Locking portion 116, 226 Hole portion 118 Protruding portion 119 Claw portion 120 Heating element fixing member 130, 230 Connecting fixing member 134, 234 Stop slit 134a Locking side 140, 440, 540 Heat receiving surface 200 Radiation fin portion 308, 508 Side 310, 510 Slit 312, 512 Cut-up portion

Claims (5)

A plurality of plate members having a heat receiving portion and a heat radiating portion formed by bending an inner end portion of one side substantially at right angles along the one side are arranged substantially parallel to the thickness direction of the heat radiating portion. A formed heat radiating fin portion having a heat receiving surface to which a heating element is directly attached;
A heat sink comprising: a connection member attached to the back surface of the heat receiving surface and connecting the plurality of adjacent plate members.   The heat radiating portion has an opening in the vicinity of the back surface of the heat receiving surface corresponding to at least a portion where the heat generating element is attached, and the connection member is inserted into the opening. The heat sink described.   The heat sink according to claim 1, wherein the connection member further includes a fixing portion for fixing to the substrate on which the heat generating element is mounted.   The heat receiving portion and the connection member each include a hole portion at a corresponding position, and further include a heat generating element fixing member that is inserted through the hole portion to attach and fix the heat generating element. The heat sink according to any one of claims 3 to 4. 2. A connecting and fixing member for connecting at least one other side other than the one side of the plurality of plate members and fixing the plurality of plate members to a substrate on which the heat generating element is mounted. The heat sink according to any one of claims 4 to 4.