JP2018004165A - Heat sink structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink structure that has excellent heat transport characteristic and function as an evenly heating plate with respect to heating elements installed in a narrowed internal space to exert excellent cooling performance by a simple configuration.SOLUTION: A heat sink structure includes: a flat type heat pipe; and a tubular heat pipe thermally connected to the flat type heat pipe, where heating elements are thermally connected to a position where the tubular heat pipe and the flat type heat pipe overlap on each other in plan view.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat sink structure excellent in cooling performance for a heating element installed in a narrow internal space.

  Electronic parts such as semiconductor elements mounted on electric / electronic devices have increased in calorific value due to high-density mounting accompanying higher functionality, and in recent years, cooling has become more important. In addition, due to the downsizing and thinning of electrical and electronic equipment, the internal space of the housing of electrical and electronic equipment is becoming increasingly narrow. A planar heat pipe may be used as a cooling means for electronic components installed in a narrowed internal space.

  As a cooling structure for an electronic component installed in a narrowed internal space, a first heating element provided in the casing, a heat sink provided in the casing, a first pressing member, and a first heating element A first heat pipe having a first portion opposite to the first heat pipe and a second portion deviating from the first heating element, and being bent by the pressing of the first pressing member, and the first heat pipe The cooling structure provided with the 2nd heat pipe and the 2nd heat pipe which has the tubular container connected to the heat sink is proposed (patent document 1).

  However, in Patent Document 1, since the flat heat pipe is bent by the pressing of the pressing member, that is, deformed in the vertical direction with respect to the flat surface, in the flat heat pipe with a thin container, the internal space In particular, the space in the thickness direction may be blocked or narrowed, and the heat transport characteristics, which are functions as a flat plate heat pipe, and the function as a soaking plate that diffuses heat throughout the flat plate may be impaired. Therefore, in patent document 1, there existed a problem that the heat transfer from the flat heat pipe to the 2nd heat pipe which has a tubular container was not enough.

  Moreover, in patent document 1, since the 2nd heat pipe which has a heat generating body and a tubular container is located away, there existed a problem that heat transfer from a heat generating body to a tubular heat pipe was not enough.

  Further, in Patent Document 1, when cooling a plurality of heating elements, flat heat pipes that are separate from each other are connected to the respective heating elements, and the flat heat pipes are respectively tubular. It needs to be connected to a second heat pipe, which is a main heat pipe, having a container. Therefore, the dimensions of the flat heat pipe must be adjusted according to the position of the heating element, and there is a problem that the number of parts increases and the structure becomes complicated.

  Further, in Patent Document 1, when cooling a plurality of heating elements, flat heat pipes which are separate from each other are connected to each other. There is a problem in that the heating element having the amount may not be sufficiently cooled.

JP 2011-106793 A

  In view of the above circumstances, the present invention has an excellent cooling performance by having an excellent heat transport characteristic and a function as a soaking plate for a heating element installed in a narrowed internal space with a simple configuration. An object of the present invention is to provide a heat sink structure that exhibits the above.

  An aspect of the present invention is a heat sink structure including a planar heat pipe and a tubular heat pipe thermally connected to the planar heat pipe, and the planar heat pipe and the tubular in a plan view. This is a heat sink structure in which a heating element is thermally connected at a position where heat pipes overlap.

  In the said aspect, a heat generating body is connected to a planar heat pipe or a tubular heat pipe. In addition, in this specification, "plan view" means the aspect visually recognized from the perpendicular direction with respect to the plane part of a planar heat pipe.

  An aspect of the present invention is a heat sink structure in which the tubular heat pipe is arranged in the direction of the heating element rather than the planar heat pipe. In the above aspect, the heating element is connected to the tubular heat pipe.

  An aspect of the present invention is a heat sink structure in which the planar heat pipe is arranged in the direction of the heating element rather than the tubular heat pipe. In the said aspect, a heat generating body is connected to a planar heat pipe.

  An aspect of the present invention is a heat sink structure in which heat exchange means is provided in a heat radiating portion of the tubular heat pipe.

  An aspect of the present invention is a heat sink structure in which the heat exchanging means has heat radiating fins.

  An aspect of the present invention is a heat sink structure in which the heat exchange means and / or the heat radiating portion of the tubular heat pipe is cooled by cooling air from a blower fan.

  According to the aspect of the present invention, since the planar heat pipe and the tubular heat pipe are thermally connected, the heat from the heating element is diffused on the surface by the planar heat pipe, and the heat radiation area is increased. In the state, the tubular heat pipe operates. Further, since the heating element is thermally connected to the position where the planar heat pipe and the tubular heat pipe overlap, heat is smoothly transferred from the heating element to the tubular heat pipe. Therefore, the heat sink structure of the present invention can exhibit excellent cooling performance with respect to the heating element by having excellent heat transport characteristics and a function as a soaking plate.

  Further, according to the aspect of the present invention, when a plurality of heating elements are cooled and the heating values of the respective heating elements are different, the heating elements having a relatively small heating value are Since it can cool with the planar heat pipe which has a function, the heat transport amount of a tubular heat pipe can be reduced by that much.

  According to the aspect of the present invention, since the number of heating elements that use a planar heat pipe and are thermally connected is not particularly limited, heat generated in a narrowed internal space with a simple configuration. Excellent cooling performance for the body.

  According to the aspect of the present invention, the tubular heat pipe is disposed in the direction of the heating element rather than the planar heat pipe, so that the heat of the heating element is smoothly transferred to the tubular heat pipe, and the The heat from the heating element transmitted to the flat heat pipe is diffused on the surface by the function of the flat plate heat pipe as a soaking plate, thereby increasing the heat radiation area. Therefore, in the said aspect, the amount of heat transport of a tubular heat pipe can be reduced, and by extension, a tubular heat pipe can be flattened (thinned) and thinned. Thus, since the tubular heat pipe can be flattened and thinned, the heat sink structure can be further downsized.

  According to the aspect of the present invention, the planar heat pipe is arranged in the direction of the heating element rather than the tubular heat pipe, so that the heat of the heating element is first brought about by the function as the soaking plate of the planar heat pipe. Since it is transmitted to the tubular heat pipe after being diffused upward, it is possible to prevent hot spots from occurring in the planar heat pipe. Thus, since a hot spot can be prevented from occurring in the planar heat pipe, excellent cooling performance can be exhibited for the heating element.

  According to the aspect of the present invention, the heat exchange means is provided in the heat radiating portion of the tubular heat pipe, so that the heat radiating characteristic of the tubular heat pipe is improved, and even a heating element installed in a narrow internal space is reliably cooled. it can.

It is explanatory drawing of the side view of the heat sink structure which concerns on the example of 1st Embodiment of this invention. It is explanatory drawing of planar view of the heat sink structure which concerns on the example of 1st Embodiment of this invention. (A) The figure is explanatory drawing of the heat sink structure which concerns on 2nd Example of this invention from the side view, (b) Figure is explanatory drawing of the planar view of the heat sink structure which concerns on 2nd Embodiment of this invention. is there. (A) The figure is explanatory drawing of the side view of the heat sink structure which concerns on 3rd Embodiment of this invention, (b) The figure is explanatory drawing of the planar view of the heat sink structure which concerns on 3rd Embodiment of this invention. is there. It is explanatory drawing of the planar view of the heat sink structure which concerns on the example of 4th Embodiment of this invention.

  The heat sink structure according to the first embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the heat sink structure 1 according to the first embodiment includes a planar heat pipe 10 and a tubular heat pipe 12 thermally connected to the planar heat pipe 10. . In the heat sink structure 1, the planar container 11 of the planar heat pipe 10 and the tubular container 13 of the tubular heat pipe 12 are in direct contact with each other so that the planar heat pipe 10 and the tubular heat pipe 12 are thermally connected. Yes.

  In the heat sink structure 1, the tubular heat pipe 12 is arranged in the direction of the heating element rather than the planar heat pipe 10. The tubular heat pipe 12 is thermally connected to the first heating element 100 mounted on the substrate 102, and the planar heat pipe 10 is thermally connected to the second heating element 101 mounted on the substrate 102. It is connected. Accordingly, the first heating element 100 is thermally connected to the planar heat pipe 10 via the tubular heat pipe 12, and the second heating element 101 is connected to the tubular heat pipe 12 via the planar heat pipe 10. Thermally connected. Accordingly, the planar heat pipe 10 has a function as a soaking plate.

  In the heat sink structure 1, the tubular heat pipe 12 is in direct contact with the first heating element 100 to be thermally connected to the first heating element 100, and the planar heat pipe 10 is connected to the second heating element 101. The heat generating grease (not shown) may be thermally connected to the second heating element 101 by direct contact, and the tubular heat pipe 12 and the first heating element 100, the planar heat pipe 10 and the second heating pipe 101 are connected to each other. It may be inserted between the heating element 101 and thermally connected.

  As shown in FIGS. 1 and 2, one end 14 of the tubular heat pipe 12 is thermally connected to the planar heat pipe 10, and the first heating element 100 is connected to the one end 14 of the tubular heat pipe 12. Thermally connected. That is, as shown in FIG. 2, the first heating element 100 is thermally connected at a position where the planar heat pipe 10 and the tubular heat pipe 12 overlap in a plan view. On the other hand, the second heating element 101 is thermally connected to the planar heat pipe 10 at a position that does not overlap the tubular heat pipe 12 in plan view. In the heat sink structure 1, one tubular heat pipe 12 is thermally connected to the planar heat pipe 10.

  The method of thermally connecting the planar heat pipe 10 and the tubular heat pipe 12 is not particularly limited. For example, the tubular container 13 of the tubular heat pipe 12 is soldered to the planar container 11 of the planar heat pipe 10. The flat heat pipe 10 and the tubular heat pipe 12 can be thermally connected by fixing by attaching, caulking, or the like.

  One end portion 14 of the tubular heat pipe 12 thermally connected to the planar heat pipe 10 and the first heating element 100 functions as a heat receiving portion of the tubular heat pipe 12. On the other hand, portions of the tubular heat pipe 12 other than the one end portion 14, that is, the center portion 15 and the other end portion 16 are not in contact with the planar heat pipe 10. Among these, the other end portion 16 of the tubular heat pipe 12 functions as a heat radiating portion of the tubular heat pipe 12. The tubular heat pipe 12 may be bent as shown in FIGS. 1 and 2 or may be used in a linear shape. Moreover, in order to improve thermal connectivity, the tubular heat pipe 12 may be partially or entirely flattened.

  In the heat sink structure 1, radiating fins 17 are attached to the other end portion 16 of the tubular heat pipe 12 (that is, the heat radiating portion of the tubular heat pipe 12) as heat exchange means. A blower fan 103 is disposed between the heat radiating fins 17 and the planar heat pipe 10. Cooling air from the blower fan 103 is supplied to the radiation fins 17.

  In the heat sink structure 1, the plurality of heat radiation fins 17 are attached to the other end portion 16 of the tubular heat pipe 12, so that heat is smoothly released from the heat radiation portion of the tubular heat pipe 12 to the external environment. The installation position of the blower fan 103 is not particularly limited, but when the blower fan 103 is disposed between the heat radiation fin 17 and the planar heat pipe 10, the blower fan 103 is operated to cool the heat radiation fin 17. Not only the wind is supplied, but also an air flow is generated from the planar heat pipe 10 toward the radiating fins 17, and this air flow also functions as cooling air for cooling the planar heat pipe 10.

  The flat heat pipe 10 includes a flat container 11, a working fluid (not shown) sealed in the internal space of the flat container 11, and a wick structure (not shown) provided in the internal space of the flat container 11. Z). The tubular heat pipe 12 includes a tubular container 13, a working fluid (not shown) sealed in the inner space of the tubular container 13, and a wick structure (not shown) provided in the inner space of the tubular container 13. And have.

  Examples of the material for the flat container 11 and the tubular container 13 include copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, stainless steel, titanium, and the like. Further, the working fluid can be appropriately selected according to the compatibility with the material of the planar container 11 and the tubular container 13, and examples thereof include water, fluorocarbons such as chlorofluorocarbons and fluorinate, and cyclopentane. Can do.

  Examples of the wick structure include a sintered body of metal powder such as copper powder, a metal mesh, a wire, a groove formed on the inner surface of the flat container 11 and the tubular container 13.

  The heating element to be cooled is not particularly limited, but a central processing unit, graphic chip (GPU, VGA), memory, capacitor, power supply mounted on the substrate 102 (for example, a circuit board built in an electronic device). Etc.

  Next, the mechanism of the cooling action of the heat sink structure 1 will be described. When one end portion 14 (heat receiving portion) of the tubular heat pipe 12 receives heat from the first heating element 100, the heat transferred from the first heating element 100 to the heat receiving portion of the tubular heat pipe 12 is the tubular heat pipe. 12 is transported to the heat radiating portion of the tubular heat pipe 12, and is discharged from the heat radiating portion of the tubular heat pipe 12 to the external environment via the heat radiating fins 17.

  Further, a part of the heat transmitted to the heat receiving portion of the tubular heat pipe 12 was thermally connected to one end portion 14 of the tubular heat pipe 12 without being transported to the heat radiating portion of the tubular heat pipe 12. It is transmitted to the planar heat pipe 10. The heat transferred from the heat receiving portion of the tubular heat pipe 12 to the planar heat pipe 10 is released from the planar heat pipe 10 while diffusing along the plane of the planar heat pipe 10. On the other hand, when the planar heat pipe 10 receives heat from the second heating element 101, the heat transmitted from the second heating element 101 to the planar heat pipe 10 is the heat transmitted from the first heating element 100. Similarly, it is discharged from the planar heat pipe 10 while diffusing along the plane of the planar heat pipe 10.

  Depending on the amount of heat generated by the second heating element 101, the heat transferred from the second heating element 101 to the flat heat pipe 10 is diffused along the plane of the flat heat pipe 10, and a part thereof. Is transported to one end 14 of the tubular heat pipe 12 and discharged from the heat radiating portion of the tubular heat pipe 12 to the external environment via the heat radiating fins 17. Accordingly, the planar heat pipe 10 has a function as a soaking plate.

  That is, the heat of the first heating element 100 and the second heating element 101 received by the heat sink structure 1 is smoothly released to the external environment by being transported to the portion of the radiation fin 17 by the tubular heat pipe 12, It diffuses along the plane of the planar heat pipe 10 and is also released from the planar heat pipe 10.

  As described above, in the heat sink structure 1, the planar heat pipe 10 and the tubular heat pipe 12 are thermally connected, so that the heat from the first heating element 100 and the second heat pipe 10 are heated by the planar heat pipe 10. In the state where the heat from the heating element 101 diffuses on the surface and the heat radiation area increases, the tubular heat pipe 12 exhibits a heat transport function. In addition, at a position where the planar heat pipe 10 and the tubular heat pipe 12 overlap each other, at least a part of the plurality of heating elements (first heating element 100 and second heating element 101) (first heating element). Since the body 100) is thermally connected, heat is smoothly transferred from the first heating element 100 to the tubular heat pipe 12. Therefore, the heat sink structure 1 can exhibit excellent cooling performance for the heating element by having excellent heat transport characteristics and a function as a soaking plate.

  Further, in the heat sink structure 1, when a plurality of heat generating elements (the first heat generating element 100 and the second heat generating element 101) are cooled and the heat generation amounts of the respective heat generating elements are different from each other, heat is generated relatively. A small amount of the heating element (for example, the second heating element 101) can be cooled by the flat heat pipe 10 having a function as a soaking plate, so that the heat transport amount of the tubular heat pipe 12 can be reduced accordingly. .

  Furthermore, in the heat sink structure 1, the flat heat pipe 10 is used, and the number of heat generating elements to be thermally connected is not particularly limited, so that heat generated in a narrowed internal space with a simple configuration. Excellent cooling performance for the body.

  In the heat sink structure 1, the tubular heat pipe 12 is arranged in the direction of the heating element (the first heating element 100 and the second heating element 101) (the direction of the substrate 102) rather than the planar heat pipe 10, thereby generating heat. The heat of the body (first heating element 100 in FIGS. 1 and 2) is smoothly transferred to the tubular heat pipe 12. In addition, the heat transmitted from each heating element (the first heating element 100 and the second heating element 101) is transmitted on the surface of the planar heat pipe 10 by the function as a soaking plate of the planar heat pipe 10. By diffusing, the heat dissipation area increases. Therefore, the amount of heat transport of the tubular heat pipe 12 can be reduced, and as a result, the tubular heat pipe 12 can be flattened and thinned. Thus, since the tubular heat pipe 12 can be flattened and thinned, the heat sink structure 1 can be further downsized.

  Next, a heat sink structure according to a second embodiment of the present invention will be described with reference to the drawings. The same components as those of the heat sink structure according to the first embodiment of the present invention will be described using the same reference numerals.

  In the heat sink structure 1 according to the first embodiment, the first heat generator 100 mounted on the substrate 102 is connected to the tubular heat pipe 12, and the first heat generator 100 mounted on the substrate 102 is connected to the planar heat pipe 10. However, instead of this, in the heat sink structure 2 according to the second embodiment, as shown in FIGS. 3 (a) and 3 (b), the planar heat pipe 10 includes The heating element is not connected.

  That is, as shown in FIG. 3, the first heating element 100 is thermally connected at a position where the planar heat pipe 10 and the tubular heat pipe 12 overlap in a plan view. On the other hand, the heating element is not connected to a position where the tubular heat pipe 12 and the planar heat pipe 10 do not overlap in plan view.

  Even in the heat sink structure 2, since the flat heat pipe 10 and the tubular heat pipe 12 are thermally connected, the heat from the first heating element 100 is caused to flow from the flat heat pipe 10 by the flat heat pipe 10. The tubular heat pipe 12 exhibits a heat transport function in a state where the heat radiating area increases while diffusing along the plane. In addition, since the heating element (first heating element 100) is thermally connected to the position where the planar heat pipe 10 and the tubular heat pipe 12 overlap each other, the first heating element 100 is smoothly connected to the tubular heat pipe 12. Heat transferred. Therefore, like the heat sink structure 1, the heat sink structure 2 can exhibit excellent cooling performance with respect to the heating element by having excellent heat transport characteristics and a function as a soaking plate.

  Next, a heat sink structure according to a third embodiment of the present invention will be described with reference to the drawings. The same components as those of the heat sink structure according to the first and second embodiments of the present invention will be described using the same reference numerals.

  In the heat sink structure 1 according to the first embodiment, the tubular heat pipe 12 is arranged in the direction of the heating element rather than the flat heat pipe 10, but instead, the heat sink structure according to the third embodiment. 3, as shown in FIGS. 4A and 4B, the planar heat pipe 10 is arranged in the direction of the heating element rather than the tubular heat pipe 12.

  The planar heat pipe 10 is connected to heating elements mounted on the substrate 102 (in FIG. 4, a plurality of heating elements, that is, the first heating element 100 and the second heating element 101). On the other hand, a heating element is not connected to the tubular heat pipe 12. Accordingly, both of the heating elements, that is, the first heating element 100 and the second heating element 101 are thermally connected to the tubular heat pipe 12 via the planar heat pipe 10. Accordingly, the planar heat pipe 10 has a function as a soaking plate.

  As shown in FIG. 4 (b), a part of the plurality of heating elements (in FIG. 4 (b), the first heat pipe 10 and the tubular heat pipe 12 overlap each other in plan view). The heating element 100) is thermally connected to the planar heat pipe 10. On the other hand, the other part of the heating elements (in FIG. 4B, the second heating element 101) is heated with the planar heat pipe 10 at a position that does not overlap the tubular heat pipe 12 in plan view. Connected.

  As shown in FIG. 4 (a), in the heat sink structure 3, the first heating element 100 is in contact with the flat heat pipe 10 directly or through heat conductive grease (not shown), thereby forming a flat surface. The mold heat pipe 10 is thermally connected. On the other hand, a heat conductive member 18 such as a heat conductive sheet is inserted between the planar heat pipe 10 and the second heat generating element 101, and the second heat generating element 101 is a heat conductive member 18. It is thermally connected to the planar heat pipe 10 via

  As described above, when the heating elements having different dimensions in the height direction are thermally connected to the heat sink structure 3, the heating elements having a small height dimension (in FIG. 4A, the second heating element 101). ) And the planar heat pipe 10, it is possible to adjust the height between the heating elements having different dimensions in the height direction while preventing an increase in thermal resistance. Therefore, deformation such as bending of the planar heat pipe 10 can be prevented, so that the internal space of the planar heat pipe 10 can be maintained, and as a result, deterioration of the cooling performance of the heat sink structure 3 can be prevented.

  Next, the mechanism of the cooling action of the heat sink structure 3 will be described. When the planar heat pipe 10 receives heat from the first heating element 100 and the second heating element 101, both the heat from the first heating element 100 and the heat from the second heating element 101 are planar heat. It is discharged from the planar heat pipe 10 while diffusing on the planar heat pipe 10 along the plane of the pipe 10. The tubular heat pipe 12 is provided at a position overlapping the first heating element 100 in plan view, and one end portion 14 (heat receiving portion) of the tubular heat pipe 12 is in direct contact with the planar heat pipe 10. . Therefore, the heat that has not been released from the planar heat pipe 10 is transmitted to the heat receiving portion of the tubular heat pipe 12. The heat transferred to the heat receiving portion of the tubular heat pipe 12 is transported from the heat receiving portion of the tubular heat pipe 12 to the other end 16 (heat radiating portion) of the tubular heat pipe 12 and from the heat radiating fins 17 provided in the heat radiating portion. Released to the outside environment. Therefore, the tubular heat pipe 12 has a function of transporting heat that has not been released from the planar heat pipe 10 to the portion of the radiation fin.

  By arranging the planar heat pipe 10 in the direction of the heating element (the first heating element 100 and the second heating element 101) rather than the tubular heat pipe 12, the heat of the heating element is changed to that of the planar heat pipe 10. Due to the function as a heat equalizing plate, the heat is first diffused along the plane of the flat heat pipe 10 and then transmitted to the tubular heat pipe 12. Accordingly, hot spots can be prevented from occurring in the planar heat pipe 10. Thus, since the heat sink structure 3 can prevent a hot spot from being generated in the planar heat pipe 10, it can exhibit excellent cooling performance for the heating element. Further, the planar heat pipe 10 can cover the entirety of the heating elements (the first heating element 100 and the second heating element 101) connected to the planar heat pipe 10 in plan view. Heat transfer from the body to the heat sink structure 3 is improved.

  Next, another embodiment of the present invention will be described. In each of the above embodiments, the number of tubular heat pipes is one. However, the number is not particularly limited, and a plurality of tubular heat pipes may be installed according to the use state of the heat sink structure.

  For example, in the heat sink structure 1 according to the first embodiment, one tubular heat pipe 12 is thermally connected to the first heating element 100 mounted on the substrate 102, but instead, As shown in FIG. 5, in the heat sink structure 4 according to the fourth embodiment, a plurality of (two in FIG. 5) tubular heat pipes 12, 12 ′ are provided on the first heating element 100 mounted on the substrate 102. May be thermally connected.

  In the heat sink structure 4, two tubular heat pipes 12 and 12 ′ are thermally connected to a position overlapping the first heating element 100 in a plan view. In the heat sink structure 4, the portion of the two tubular heat pipes 12 and 12 ′ that overlaps the first heating element 100 in plan view is arranged in parallel and overlaps with the planar heat pipe 10 in plan view. In the part which is not present, one tubular heat pipe 12 and the other tubular heat pipe 12 ′ are arranged so as to be substantially symmetrical with respect to the center line of the planar heat pipe 10.

  The plurality of tubular heat pipes 12 and 12 ′ are thermally connected to the first heating element 100, so that the first heating element 100 can be securely connected even when the first heating element 100 generates a large amount of heat. Can be cooled.

  In addition, the number of heating elements that are thermally connected to the position where the planar heat pipe and the tubular heat pipe overlap in plan view is not particularly limited, and in each of the above embodiments, one heating element is provided at the position. Are thermally connected, but a plurality of heating elements may be thermally connected.

  In each of the above embodiments, the heat radiating fins are provided as the heat exchanging means in the heat radiating portion of the tubular heat pipe. However, the heat exchanging means may not be provided depending on the use situation. Moreover, in each said embodiment, although the ventilation fan was installed in the radiation fin vicinity, it is not necessary to install a ventilation fan according to a use condition. Moreover, you may apply | coat heat conductive grease between a heat generating body and a planar heat pipe or a tubular heat pipe as needed in order to improve thermal connectivity.

  The heat sink structure of the present invention exhibits excellent cooling performance by having an excellent heat transport characteristic and a function as a heat equalizing plate for a heating element installed in a narrowed internal space with a simple configuration. Therefore, for example, the utility value is high in the field of cooling the heating element mounted on the substrate.

1, 2, 3, 4 Heat sink structure 10 Planar heat pipe 12 Tubular heat pipe 17 Radiation fin

An aspect of the present invention is a heat sink structure including a planar heat pipe and a tubular heat pipe thermally connected to the planar heat pipe, and the planar heat pipe and the tubular in a plan view. a position the heat pipe overlap, the heating element is thermally connected, the heat receiving portion of the tubular heat pipe is the heat sink structure that extend along the planar heat pipe in the flat machined and, in plan view .

Claims (6)

A heat sink structure comprising a planar heat pipe and a tubular heat pipe thermally connected to the planar heat pipe,
A heat sink structure in which a heating element is thermally connected to a position where the planar heat pipe and the tubular heat pipe overlap in a plan view.   The heat sink structure according to claim 1, wherein the tubular heat pipe is disposed in a direction of the heating element with respect to the planar heat pipe.   The heat sink structure according to claim 1, wherein the planar heat pipe is disposed in a direction of the heating element with respect to the tubular heat pipe.   The heat sink structure according to any one of claims 1 to 3, wherein a heat exchanging means is provided in a heat radiating portion of the tubular heat pipe.   The heat sink structure according to claim 4, wherein the heat exchanging means has a radiation fin.   The heat sink structure according to claim 4 or 5, wherein the heat exchange means and / or the heat radiating portion of the tubular heat pipe is cooled by cooling air from a blower fan.

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