JP2020072161A - Heat sink - Google Patents

Abstract

To fully exert a heat transfer function of a heat pipe to improve a cooling performance even when a size of a heating element is small.SOLUTION: A heat sink 1 comprises a heat receiving member 2 and first and second heat pipes 3 and 4. The first and second heat pipes 3 and 4 are laminated in an order of the first heat pipe 3 and the second heat pipe 4 along a first direction from a heat receiving surface of the heat receiving member 2 toward a back surface 2b. The second heat pipe 4 includes a proximity heat pipe 43 arranged in a first area Ar1 in which a heating element 100 is arranged, and a separation heat pipe 44 arranged in a second area Ar2 other than the first area Ar1. An area of the first heat pipe 3 which overlaps with the separation heat pipe 44 is larger than an area of the first heat pipe which overlaps with the proximity heat pipe 43.SELECTED DRAWING: Figure 3

Description

  The present invention relates to heat sinks.

Conventionally, as a heat sink for cooling a heating element such as a semiconductor element, a heat sink for cooling the heating element by utilizing latent heat when a working fluid enclosed in a hermetically sealed container undergoes a phase change, that is, a heat having a heat transport function. A heat sink using a pipe is known (for example, see Patent Document 1).
The heat sink described in Patent Document 1 is a laminated body in which three aluminum plates are laminated, and is disposed between a heat receiving member having a heat receiving surface that is thermally connected to a heat generating body and an adjacent aluminum plate. And a plurality of heat pipes.
Specifically, the plurality of heat pipes are composed of two layers stacked along the stacking direction of the three aluminum plates. In the following, the plurality of heat pipes in the first layer will be referred to as a first heat pipe, and the plurality of heat pipes in the second layer will be referred to as a second heat pipe in order from the heat receiving surface side. That is, in the heat sink described in Patent Document 1, the heating element is cooled by utilizing the heat transport function of the first and second heat pipes that are stacked on each other.

JP-A-57-80748 (FIG. 3)

By the way, when the size of the heat generating element is reduced, it is difficult to make the distances between all the heat pipes constituting the second heat pipe and the heat generating element the same due to the design of the heat pipe. That is, in the second heat pipe, a heat pipe having a relatively small separation distance from the heating element (hereinafter referred to as a proximity heat pipe) and a heat pipe having a relatively large separation distance from the heating element (hereinafter referred to as a separation distance). (Described as heat pipe) will exist.
In this case, since the proximity heat pipe has a relatively small distance from the heating element, it is considered that the heat from the heating element can be sufficiently taken in through the heat receiving member and the heat transport function can be sufficiently exerted. .. On the other hand, since the separated heat pipe has a relatively large separation distance from the heating element, it is not possible to take in sufficient heat from the heating element via the heat receiving member, and it is not possible to sufficiently exhibit the heat transport function. it is conceivable that. That is, when the size of the heating element is small, there is a problem that the heat transport function of the heat pipe cannot be sufficiently exerted and it is difficult to improve the cooling performance of the heat sink.

  The present invention has been made in view of the above, and provides a heat sink capable of sufficiently exhibiting the heat transport function of the heat pipe and improving the cooling performance even when the size of the heating element is small. The purpose is to do.

  In order to solve the above-mentioned problems and to achieve the object, a heat sink according to the present invention has a heat receiving surface that is thermally connected to a heating element, and a heat receiving member that has a back surface that forms a front surface and a back surface with the heat receiving surface, A first heat pipe thermally connected to the heat receiving member; and a second heat pipe thermally connected to the heat receiving member and the first heat pipe, respectively. The heat pipe and the second heat pipe are stacked in the order of the first heat pipe and the second heat pipe along a first direction from the heat receiving surface toward the back surface, and the second heat pipe is stacked. When the area of the entire heat receiving member is divided into a first area in which the heating element is arranged and a second area other than the first area when viewed along the first direction , The proximity arranged in the first area A heat pipe and a separated heat pipe arranged in the second region, wherein the first heat pipe has an area larger than that of the adjacent heat pipe when viewed along the first direction. The area overlapping the separated heat pipe is larger.

  Further, in the heat sink according to the present invention, in the above invention, the proximity heat pipe and the separation heat pipe each have a portion on one end side overlapping the heat receiving member when viewed along the first direction, and the like. The end side portions respectively extend in the direction away from the heat receiving member, and at the other end side portions of the proximity heat pipe and the separation heat pipe, in the extending direction of the proximity heat pipe and the separation heat pipe. It is characterized in that a plurality of fins arranged in parallel are attached.

  Further, in the heat sink according to the present invention, in the above invention, the proximity heat pipe and the separation heat pipe have a larger separation distance between the parts on the other end side than a separation distance between the parts on the one end side. And

  According to the heat sink according to the present invention, even if the size of the heating element is small, the heat transport function of the heat pipe can be sufficiently exerted and the cooling performance can be improved.

FIG. 1 is a perspective view showing the configuration of the heat sink according to the first embodiment. FIG. 2 is an exploded perspective view of the heat sink. FIG. 3 is a plan view of the heat sink. FIG. 4 is a perspective view showing the configuration of the heat sink according to the second embodiment. FIG. 5 is an exploded perspective view of the heat sink. FIG. 6 is a plan view of the heat sink. FIG. 7 is a diagram showing a first modification of the first and second embodiments. FIG. 8 is a diagram showing a modified example 1 of the first embodiment and the second embodiment. FIG. 9 is a diagram showing a modified example 2 of the first embodiment and the second embodiment. FIG. 10 is a diagram showing a modified example 3 of the first and second embodiments.

  Hereinafter, modes (hereinafter, embodiments) for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Further, in the description of the drawings, the same parts are designated by the same reference numerals. Further, the drawings are schematic, and the dimensional relationship of each element, the ratio of each element, and the like may differ from the actual situation. Further, the drawings may include portions having different dimensional relationships and ratios from each other.

(Embodiment 1)
[Structure of heat sink]
FIG. 1 is a perspective view showing the configuration of the heat sink 1 according to the first embodiment. FIG. 2 is an exploded perspective view of the heat sink 1. FIG. 3 is a plan view of the heat sink 1.
In addition, in FIG. 1, the Z axis indicates an axis parallel to the vertical direction (+ Z axis side is the upper side and −Z axis side is the lower side). Further, the X axis and the Y axis are two axes orthogonal to the Z axis. The same applies to the drawings after FIG.
The heat sink 1 is a heat sink using a heat pipe having a heat transport function, and cools an electric component 100 (FIG. 3) such as a semiconductor element which is a heating element. In the first embodiment, the electric component 100 is a small component and is housed inside the sealed casing 200 (FIG. 1). Then, the heat sink 1 uses a heat pipe to transfer heat from the electric component 100 to the outside of the closed casing 200, and radiates the heat outside the closed casing 200.
As shown in FIGS. 1 to 3, the heat sink 1 includes a heat receiving member 2, a plurality of (six in the first embodiment) first heat pipes 3 (FIGS. 2 and 3), and a plurality of (pieces). The second embodiment includes five second heat pipes 4 and a plurality of fins 5.

The heat receiving member 2 is formed of a laminated body in which a plurality of layers (three layers in the present embodiment) of plate bodies made of a metal material such as aluminum, aluminum alloy, copper, and copper alloy are laminated along the Z-axis direction. ing. Then, the heat receiving member 2 is arranged inside the closed casing 200 in a posture in which each plate surface is parallel to the XY plane. In the following, as shown in FIG. 2, the first layer is referred to as a heat receiving plate 21, the second layer is referred to as a first heat equalizing plate 22, and the third layer is referred to as a second layer in order from the −Z axis side. The soaking plate 23 of FIG.
The heat receiving plate 21 is configured by a substantially square plate body having a planar shape larger than that of the electric component 100 (planar shape when viewed along the Z axis). Here, in the heat receiving plate 21, the −Z-axis side plate surface corresponds to the heat receiving surface 2a (FIGS. 1 and 2) according to the present invention. Then, the electric component 100 is thermally connected to the center position P1 of the heat receiving surface 2a (FIG. 3).

The first heat equalizing plate 22 has substantially the same outer shape as the heat receiving plate 21. Then, the first heat equalizing plate 22 is attached to the + Z-axis side plate surface of the heat receiving plate 21. That is, the first soaking plate 22 is thermally connected to the heat receiving plate 21.
As shown in FIG. 2, the first heat equalizing plate 22 penetrates through the front and back and has a planar shape of the six first heat pipes 3 (a planar shape when viewed along the Z axis). A first placement opening 221 having substantially the same planar shape as the above is formed.

The second heat equalizing plate 23 has substantially the same outer shape as the heat receiving plate 21 and the first heat equalizing plate 22. Then, the second heat equalizing plate 23 is attached to the plate surface of the first heat equalizing plate 22 on the + Z axis side. That is, the second soaking plate 23 is thermally connected to the first soaking plate 22. Here, in the second heat equalizing plate 23, the plate surface on the + Z axis side corresponds to the back surface 2b (FIGS. 1 and 2) according to the present invention. That is, the + Z axis direction, which is the direction from the heat receiving surface 2a to the back surface 2b, corresponds to the first direction according to the present invention.
As shown in FIG. 1 or FIG. 2, the second heat equalizing plate 23 extends from the end surface on the + X axis side toward the −X axis side, and includes five second heat pipes 4. Five second placement openings 231 having substantially the same planar shape as the planar shape (planar shape when viewed along the Z axis) are formed.

The six first heat pipes 3 have the same configuration, the same heat transport function, and the same cross-sectional shape (cross-sectional shape orthogonal to the longitudinal direction).
Although not specifically shown, the first heat pipe 3 has a configuration in which a working fluid is enclosed in a long container. Examples of the material of the container include copper and copper alloys because of their excellent thermal conductivity, and aluminum and aluminum alloys because of their light weight. In the first embodiment, the first heat pipe 3 (the container) has a flat cross-sectional shape (perpendicular to the longitudinal direction) so as to have a thickness dimension substantially the same as the thickness dimension of the first soaking plate 22. Cross section). Further, a wick structure is provided on the inner surface of the container from one end 31 (FIGS. 2 and 3) to the other end 32 (FIGS. 2 and 3). That is, the wick structure extends in the longitudinal direction of the container. The wick structure may be any structure that produces a capillary force, and includes a plurality of fine grooves (grooves) extending in the longitudinal direction of the container, a sintered body of metal powder, and a sintered body of metal fibers. A metal mesh or the like can be exemplified. Further, the working fluid can be appropriately selected according to the compatibility with the material of the container, and water, alternative CFCs, perfluorocarbons, cyclopentane, etc. can be exemplified.

  Then, in the first heat pipe 3, when the part on the one end 31 side is heated, the working fluid at the part evaporates, and the heat is released from the one end 31 side to the other end 32 side inside the container. It liquefies. Further, the liquefied working fluid follows the wick structure, returns to the one end 31 side, and evaporates again. That is, the first heat pipe 3 has a heat transport function of transporting the heat received at the part on the one end 31 side toward the other end 32 side by repeating the above-described evaporation, liquefaction, and evaporation.

  The six first heat pipes 3 described above are arranged in the first arrangement opening 221 while being sandwiched between the heat receiving plate 21 and the second heat equalizing plate 23. That is, the six first heat pipes 3 are arranged in the same XY plane inside the closed casing 200. In addition, the + Z axis side plate surfaces of the six first heat pipes 3 and the heat receiving plate 21, the edge portion of the first placement opening 221, and the −Z axis side plate of the second heat equalizing plate 23. Thermally conductive members such as solder and grease are interposed in the gaps between the surfaces. That is, the six first heat pipes 3 are thermally connected to the heat receiving plate 21 and the first and second soaking plates 22 and 23, respectively.

Further, as shown in FIG. 3, the portions of the six first heat pipes 3 on the one end 31 side overlap with the electric component 100 when viewed along the Z axis, and the X axis (Y axis). ) At about 45 °. The six first heat pipes 3 are bent a plurality of times (for example, once or twice) so as to cover the entire heat receiving member 2 when viewed along the Z axis, and the other ends of the six heat pipes 3 are bent. Each extends to 32.
That is, the heat transferred from the electric component 100 to the vicinity of the center position P1 of the heat receiving plate 21 is directed from the part on the one end 31 side to the other end 32 by the heat transport function of the six first heat pipes 3. It is transported and diffused throughout the heat receiving member 2.

The five second heat pipes 4 have the same configuration as the first heat pipe 3, the same heat transport function, and the same cross-sectional shape (cross-sectional shape orthogonal to the longitudinal direction).
Then, the five second heat pipes 4 are arranged in the five second arrangement openings 231 respectively. That is, the five second heat pipes 4 are arranged in the same XY plane. Further, the first heat pipe 3 and the second heat pipe 4 are laminated in the order of the first heat pipe 3 and the second heat pipe 4 along the + Z axis direction. In addition, the + Z axis side plate surfaces of the five second heat pipes 4 and the first heat equalizing plate 22, the + Z axis side surfaces of the six first heat pipes 3, and the five second Thermally conductive members such as solder and grease are interposed in the gaps between the arrangement openings 231 and the edge portions. That is, the five second heat pipes 4 are thermally connected to the heat receiving plate 21, the first heat equalizing plate 22, the second heat equalizing plate 23, and the six first heat pipes 3. Connected to.

Further, as shown in FIG. 3, the five second heat pipes 4 extend substantially linearly from the one end 41 to the other end 42 along the X axis and are arranged in parallel along the Y axis. ing. That is, in the first embodiment, the distance between the parts on the one end 41 side of the second heat pipes 4 adjacent to each other and the distance between the parts on the other end 42 side are set to be substantially the same. ing. More specifically, among the five second heat pipes 4, one second heat pipe 4 located at the center in the Y-axis direction is located at the center position P1 when viewed along the Z-axis. They are arranged at overlapping positions. In addition, the other four second heat pipes 4 are spaced at substantially equal intervals on the + Y axis side and the −Y axis side with respect to the one second heat pipe 4 located at the center in the Y axis direction. Are installed. Further, in the five second heat pipes 4, when viewed along the Z axis, the part on the one end 41 (FIG. 3) side overlaps with the heat receiving member 2, and the part on the other end 42 (FIG. 3) side. Respectively extend in the + X axis direction away from the heat receiving member 2. Then, the portions of the five second heat pipes 4 on the other end 42 side project to the outside of the hermetically sealed casing 200, as shown in FIG. 1.
That is, the heat transferred from the electric component 100 to the heat receiving plate 21 and diffused to the entire heat receiving member 2 by the heat transport function of the six first heat pipes 3 is the heat transport of the five second heat pipes 4. Depending on the function, it is transported toward each of the other ends 42 and is exhausted to the outside of the closed casing 200.

  Each of the plurality of fins 5 is made of a metal material such as aluminum and has a thin flat plate shape. Then, the plurality of fins 5 are arranged outside the closed casing 200 at a specific pitch in the X-axis direction in a posture in which the plate surfaces are parallel to the YZ plane, and each of the five second heat pipes 4 and the like. The parts on the side of the end 42 penetrate respectively. That is, the plurality of fins 5 are thermally connected to the five second heat pipes 4. Then, the heat exhausted to the outside of the closed casing 200 by the heat transport function of the five second heat pipes 4 is radiated by the plurality of fins 5.

[Regarding the positional relationship between the first heat pipe and the second heat pipe]
Next, the positional relationship between the first heat pipe 3 and the second heat pipe 4 will be described with reference to FIG.
In the following, for convenience of explanation, the first region Ar1 (FIG. 3) in which the electric component 100 is disposed (including the central position P1) and the first region Ar1 are arranged in the entire region of the heat receiving member 2 when viewed along the Z axis. It is divided into two second regions Ar2 (FIG. 3) other than the region Ar1. Of the five second heat pipes 4, when viewed along the Z axis, the three second heat pipes 4 arranged in the first region Ar1 are close to each other according to the present invention. It corresponds to the heat pipe 43 (FIG. 3). On the other hand, the two second heat pipes 4 respectively arranged in the two second regions Ar2 correspond to the separated heat pipes 44 (FIG. 3) according to the present invention. In other words, the region where the three adjacent heat pipes 43 that overlap with the electric component 100 when viewed along the Z axis are arranged is the first region Ar1, and the other regions are the second regions Ar2.

  Then, the six first heat pipes 3 are respectively arranged so that the area overlapping with the adjacent heat pipes 44 is larger than the area overlapping with the adjacent heat pipes 43 when viewed along the Z axis. ing. Note that, in FIG. 3, only one first heat pipe 3 among the six first heat pipes 3 is focused on, and the one first heat pipe 3, the proximity heat pipe 43, and the separated heat Areas that overlap with the pipes 44 are shaded.

According to the first embodiment described above, the following effects are achieved.
Since the proximity heat pipe 43 is arranged in the first region Ar1, the separation distance from the electric component 100 is smaller than that of the separation heat pipe 44. That is, the proximity heat pipe 43 can sufficiently take in heat from the electric component 100 via the heat receiving member 2 and can sufficiently exert the heat transport function. On the other hand, since the separation heat pipe 44 is disposed in the second region Ar2, the separation distance from the electric component 100 is larger than that of the proximity heat pipe 43. That is, it is difficult for the separated heat pipe 44 to sufficiently take in heat from the electric component 100 via the heat receiving member 2, and it is difficult to sufficiently exert the heat transport function.

Therefore, in the heat sink 1 according to the first embodiment, the position of the first heat pipe 3 having a function of diffusing the heat transferred from the electric component 100 to the vicinity of the central position P1 of the heat receiving plate 21 over the entire heat receiving member 2 is set. I am devising.
That is, the first heat pipe 3 is arranged such that the area overlapping the adjacent heat pipes 44 is larger than the area overlapping the adjacent heat pipes 43 when viewed along the Z axis. Therefore, the separated heat pipe 44 can sufficiently take in heat from the electric component 100 by the heat transport function of the first heat pipe 3. That is, the heat transport function of the separated heat pipe 44 can be sufficiently exerted.
Therefore, even if the size of the electric component 100 is small, the heat transport function of the heat pipe can be sufficiently exerted, and the cooling performance of the heat sink 1 can be improved.

  In addition, in the heat sink 1 according to the first embodiment, the second heat pipe 4 has a portion on the other end 42 side that protrudes to the outside of the closed casing 200. Further, a plurality of fins 5 are attached to a portion of the second heat pipe 4 on the other end 42 side. That is, the size of the fin 5 is not limited by the size of the closed casing 200, and the degree of freedom in designing the fin 5 is improved. Further, since the heat of the electric component 100 can be exhausted to the outside of the closed casing 200, the temperature inside the closed casing 200 does not become higher than necessary, and the electric component 100 can be cooled effectively. it can.

(Embodiment 2)
Next, the second embodiment will be described.
In the following description, the same components as those in the above-described first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted or simplified.
FIG. 4 is a perspective view showing the configuration of the heat sink 1A according to the second embodiment. FIG. 5 is an exploded perspective view of the heat sink 1A. FIG. 6 is a plan view of the heat sink 1A.
In the heat sink 1 according to the first embodiment described above, the electric component 100 is arranged at the center position P1 of the heat receiving surface 2a.
On the other hand, in the heat sink 1A according to the second embodiment, as shown in FIG. 6, the electric component 100 is arranged on the heat receiving surface 2a at the corner position P2 separated from the center position P1. Along with this, in the heat sink 1A according to the second embodiment, as shown in FIG. 5 or 6, in addition to the heat sink 1 described in the first embodiment, six first heat pipes 3 are provided. Employs a plurality of (five in the second embodiment) first heat pipes 3A each having a different planar shape (planar shape when viewed along the Z axis).

Specifically, as shown in FIG. 6, the portions of the five first heat pipes 3 </ b> A on the respective one ends 31 overlap with the electric component 100 when viewed along the Z-axis, and the X-axis ( They extend in directions intersecting with each other at about 45 ° with respect to the Y axis). Then, when viewed along the Z axis, the five first heat pipes 3A are bent once or twice so as to extend over the entire heat receiving member 2 and extend to the other ends 32, respectively. ..
That is, the heat transferred from the electric component 100 to the vicinity of the corner position P2 of the heat receiving plate 21 is directed from the part on the one end 31 side to the other end 32 by the heat transport function of the five first heat pipes 3A. Are transported and diffused throughout the heat receiving member 2.

  It should be noted that the positions of the first region Ar1 and the second region Ar2 in the heat receiving member 2 are changed as the position where the electric component 100 is arranged is changed (FIG. 6). That is, the first region Ar1 according to the second embodiment is a region including the corner position P2. The second area Ar2 is an area other than the first area Ar1. Of the five second heat pipes 4, when viewed along the Z axis, the two second heat pipes 4 arranged in the first region Ar1 are close to each other according to the present invention. It corresponds to the heat pipe 43 (FIG. 6). On the other hand, the three second heat pipes 4 arranged in the second region Ar2 correspond to the separated heat pipes 44 (FIG. 6) according to the present invention. In other words, the region in which the two adjacent heat pipes 43 that overlap with the electric component 100 when viewed along the Z axis are arranged is the first region Ar1, and the other regions are the second regions Ar2.

Then, the five first heat pipes 3A (3A1 to 3A5) are arranged so as to respectively overlap with the five second heat pipes 4 as shown below when viewed along the Z axis. Has been done.
Of the two second heat pipes 4, the first heat pipe 3A1 has the largest overlapping area with the second heat pipe 4 (separated heat pipe 44) located at the lowermost position in FIG. It is arranged. The same applies to the other first heat pipes 3A3.
Of the five second heat pipes 4, the first heat pipe 3A2 has the largest area in which it overlaps with the second heat pipe 4 (separated heat pipe 44) located in the vertical center in FIG. It is arranged as follows.
Of the five second heat pipes 4, the first heat pipe 3A4 has the largest area in which it overlaps with the second heat pipe 4 (separated heat pipe 44) located second from the bottom in FIG. It is arranged as follows. The same applies to the other first heat pipes 3A5.

  The first placement openings 221 according to the second embodiment are different from the first placement openings 221 described in the first embodiment above in the planar shape of the five first heat pipes 3A. It is changed so as to have a substantially same planar shape as (planar shape when viewed along the Z axis). Further, in the space formed when the five first heat pipes 3A are arranged in the first arrangement opening 221, heat having the same thickness dimension as that of the first soaking plate 22 is formed. A plate 24 (FIG. 5) made of a conductive member is arranged. The plate 24 is adjacent to the first heat pipe 3A, the + Z-axis side plate surface of the heat receiving plate 21, the −Z-axis side plate surface of the second heat equalizing plate 23, and the adjacent plate. Are thermally connected to the respective second heat pipes 4 arranged.

  Even when the arrangement position of the electric component 100 is changed as in the second embodiment described above, by adopting the five first heat pipes 3A, the above-described first embodiment is not provided. Has the same effect.

(Other embodiments)
So far, the embodiments for carrying out the present invention have been described, but the present invention should not be limited only by the above-described first and second embodiments.
7 and 8 are diagrams showing a first modification of the first embodiment and the second embodiment. Specifically, FIG. 7 is a side view of the heat sink 1B according to the first modification as viewed along the Y axis. FIG. 8 is a plan view of the heat sink 1B viewed along the Z axis. 7 and 8, only three second heat pipes 4 are shown for convenience of description.
In Embodiment 1 and Embodiment 2 described above, the distance between the portions on the one end 41 side of the second heat pipes 4 adjacent to each other and the distance between the portions on the other end 42 side are substantially the same. Although the same settings are made, the present invention is not limited to this, and the configuration of the heat sink 1B shown in FIG. 7, for example, may be adopted.

Specifically, in the heat sink 1B, of the three second heat pipes 4, the second heat pipe 45 located at the center in the Y-axis direction extends linearly along the X-axis. In addition, in the other two second heat pipes 46 and 47, the portion protruding from the heat receiving member 2 to the + X axis side is bent to the + Z axis side or the −Z axis side, and then linear along the X axis. Extend to. That is, in the heat sink 1B, the distance between the parts on the other end 42 side of the second heat pipes 4 adjacent to each other is larger than the distance between the parts on the one end 41 side.
In the case of the configuration of the first modification, the heat exhausted to the outside of the closed casing 200 by the heat transport function of the plurality of second heat pipes 4 is unevenly transferred to a part of the fins 5. Therefore, the heat dissipation efficiency of the fins 5 can be improved.

FIG. 9 is a diagram showing a second modification of the first embodiment and the second embodiment. Specifically, FIG. 9 is a side view of the heat sink 1C according to Modification 2 as viewed along the Y axis. Note that, in FIG. 9, only three second heat pipes 4 are illustrated for convenience of description.
In the heat sink 1C according to the present second modification, the entire portion of the three second heat pipes 4 protruding from the heat receiving member 2 toward the + X axis side is set to the + Z axis side with respect to the heat sink 1B according to the above first modification. When pushed up, the shape as a whole is inclined toward the + Z axis as it goes toward the + X axis.
Even in the case of the configuration of the second modification, the same effect as that of the first modification described above can be obtained.

FIG. 10: is a figure which shows the modification 3 of this Embodiment 1 and Embodiment 2. As shown in FIG. Specifically, FIG. 10 is a side view of the heat sink 1D according to Modification 3 as viewed along the Y axis. Note that, in FIG. 10, only three second heat pipes 4 are illustrated for convenience of description.
In the heat sink 1D according to Modified Example 3, of the three second heat pipes 4, the second heat pipe 45 located at the center in the Y-axis direction projects from the heat receiving member 2 to the + X-axis side, It bends to the + Z axis side and inclines toward the + Z axis as it extends toward the + X axis. The other two second heat pipes 46 and 47 project from the heat receiving member 2 to the + X axis side, and then move to the + Z axis at an inclination angle different from that of the second heat pipe 45. Inclining and extending. At this time, the plurality of fins 5 are divided for each of the three second heat pipes 4.
Even in the case of the configuration of the third modified example, the same effect as that of the first modified example can be obtained.

In the first embodiment, the second embodiment, and the modified examples 1 to 3 described above, the heat receiving member 2 is composed of a laminated body of three layers, but it is not limited to this and may be composed of one body. It may be composed of a laminated body of two layers, or may be composed of a laminated body of four or more layers. Similarly, the numbers of the first and second heat pipes 3 (3A) and 4 are not limited to the numbers described in the first embodiment, the second embodiment, and the modified examples 1 to 3, and other numbers. It doesn't matter.
In the first embodiment, the second embodiment, and the modified examples 1 to 3 described above, the postures in which the heat sinks 1 and 1A to 1D are arranged are the same as those in the first embodiment, the second embodiment, and the modified examples 1 to 1. The posture is not limited to the posture described in 3, and other postures may be used.

1, 1A to 1D Heat sink 2 Heat receiving member 2a Heat receiving surface 2b Rear surface 3, 3A, 3A1 to 3A5 First heat pipe 4, 45 to 47 Second heat pipe 5 Fin 21 Heat receiving plate 22 First heat equalizing plate 23 Second soaking plate 24 Plate 31 One end 32 Other end 41 One end 42 Other end 43 Proximity heat pipe 44 Spacing heat pipe 100 Electrical component 200 Sealed housing 221 First placement opening 231 Second placement opening Ar1 1st area | region Ar2 2nd area | region P1 center position P2 corner position

Claims (3)

A heat-receiving member that has a heat-receiving surface that is thermally connected to the heating element, and a back surface that forms front and back surfaces with the heat-receiving surface;
A first heat pipe thermally connected to the heat receiving member;
A second heat pipe thermally connected to the heat receiving member and the first heat pipe,
The first heat pipe and the second heat pipe are
The first heat pipe and the second heat pipe are laminated in this order along a first direction from the heat receiving surface to the back surface,
The heat receiving member,
It is divided into a first region in which the heating element is arranged and a second region other than the first region,
The second heat pipe is
A proximity heat pipe arranged in the first region and a separated heat pipe arranged in the second region,
The first heat pipe is
A heat sink characterized in that an area overlapping with the adjacent heat pipe is larger than an area overlapping with the adjacent heat pipe. The proximity heat pipe and the separated heat pipe,
The part on one end side overlaps with the heat receiving member, and the part on the other end side extends in a direction away from the heat receiving member,
On the other end side of the proximity heat pipe and the separated heat pipe,
The heat sink according to claim 1, wherein a plurality of fins arranged in parallel in the extending direction of the adjacent heat pipe and the spaced heat pipe are attached. The proximity heat pipe and the separated heat pipe,
The heat sink according to claim 2, wherein the distance between the portions on the other end side is larger than the distance between the portions on the one end side.

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