Thermal diffusion device and electronic equipment

Abstract

A thermal diffusion device and an electronic apparatus are provided. This heat diffusion device (1) is provided with: a housing (10) having a first inner wall surface (11a) and a second inner wall surface (12a) which face each other in the thickness direction Z; a working medium (20) sealed in the internal space of the housing (10); and a core (30) disposed in the internal space of the housing (10). The core (30) is provided with: a support (31) that is in contact with the first inner wall surface (11a); and a perforated body (32) that is in contact with the support body (31). The perforated body (32) has a through-hole (33) penetrating in the thickness direction (Z). Protrusions (34) are provided on the periphery of the through-hole (33) in a direction approaching the first inner wall surface (11a).

Description

[0001] This application is a divisional application of an application with the filing date of January 5, 2023, the application number of 2023 9 0000 195.2 (PCT / JP2023 / 000095), and the utility model name of "Heat Diffusion Device and Electronic Equipment". TECHNICAL FIELD

[0002] The utility model relates to heat diffusion device and electronic equipment. BACKGROUND

[0003] In recent years, the heat generation has increased due to the high integration and high performance of components. In addition, as the product is miniaturized, the heat generation density increases, and therefore, the heat dissipation countermeasure becomes important. This situation is particularly remarkable in the field of mobile terminals such as smartphones and tablet computers. As a heat countermeasure member, graphite sheet or the like is used, but the heat transport amount is not sufficient, and therefore, the use of various heat countermeasure members is being studied. Among them, as a heat diffusion device that can very effectively diffuse heat, the use of a planar heat pipe, that is, a vapor chamber, is also being promoted.

[0004] The vapor chamber has a structure in which a working medium (also referred to as a working fluid) and a wick that transports the working medium by capillary force are enclosed inside a housing. The working medium absorbs heat from a heat generating element such as an electronic component at an evaporation portion for absorbing heat from the heat generating element, and after the working medium evaporates inside the vapor chamber, the working medium moves inside the vapor chamber, is cooled, and returns to a liquid phase. The working medium that returns to the liquid phase moves again to the evaporation portion on the heat generating element side by the capillary force of the wick, and cools the heat generating element. By repeatedly performing the above actions, the vapor chamber operates by itself without external power, and can two-dimensionally and at high speed diffuse heat using the latent heat of evaporation and the latent heat of condensation of the working medium.

[0005] Patent Literature 1 discloses a thermal ground plane as one example of a vapor chamber. The thermal ground plane described in Patent Literature 1 has: a first planar substrate member; a plurality of micro pillars disposed on the first planar substrate member; a mesh adhered to at least a part of the micro pillars; a vapor core disposed in at least one of the first planar substrate member, the micro pillars, and the mesh; and a second planar substrate member disposed on the first planar substrate member, the mesh separates the micro pillars from the vapor core, and the first planar substrate member and the second planar substrate member surround the micro pillars, the mesh, and the vapor core.

[0006] Patent Literature 1: U.S. Patent No. 10,527,358

[0007] In the heat spreader described in Patent Literature 1, a core is configured by a pillar such as a micro pillar and a porous body such as a mesh. As the porous body of the heat spreader, a porous body in which a hole portion is formed in a metal plate by etching processing or the like is used. In such a porous body, in a portion on the liquid flow path side of the working medium, the surface of the porous body and the surface surrounded by the periphery of the hole portion are flush with each other. Also, in the portion on the liquid flow path side of the working medium, the surface surrounded by the periphery of the hole portion is in contact with the working medium, and thus capillary force is generated. However, there is a potential problem that, for example, when the amount of liquid of the working medium is small due to a process problem such as a small amount of injection of the working medium in an injection process at the time of manufacturing of the heat spreader, or the like, in the portion on the liquid flow path side of the working medium in the porous body, there is a case where the surface surrounded by the periphery of the hole portion is not in contact with the working medium, and thus capillary force is not easily generated in the core. In this case, movement of the working medium is not easily generated in the heat spreader, and thus there is a problem that heat spreading performance and heat transport performance of the heat spreader are reduced. SUMMARY

[0008] The present application has been made to solve the above problems, and has as its object to provide a heat spreading device capable of suppressing reduction in heat spreading performance and heat transport performance even when the amount of liquid of a working medium is small. Also, the present application has as its object to provide an electronic device provided with the heat spreading device.

[0009] The heat spreading device of the present application is provided with: a housing having a first inner wall surface and a second inner wall surface facing each other in a thickness direction; a working medium enclosed in an internal space of the housing; and a core disposed in the internal space of the housing, the core including: a support body in contact with the first inner wall surface; and a porous body in contact with the support body, the porous body having a through-hole penetrating in the thickness direction, and a protrusion provided on the periphery of the through-hole in a direction approaching the first inner wall surface.

[0010] The electronic device of the present application is provided with the heat spreading device of the present application.

[0011] According to the present application, it is possible to provide a heat spreading device capable of suppressing reduction in heat spreading performance and heat transport performance even when the amount of liquid of a working medium is small. Also, according to the present application, it is possible to provide an electronic device provided with the heat spreading device. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a perspective view schematically showing one example of the heat spreading device of the present application.

[0013] Figure 2 is Figure 1An example of a cross-sectional view of the heat diffusion device shown along line II-II.

[0014] Figure 3 A of FIG. 1 is a partially enlarged cross-sectional view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 2 An example of a cross-sectional view of the core and the working medium of the heat diffusion device shown. Figure 3 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 3 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 3 C of FIG. 1 is a perspective view schematically showing another example of the shape of the convex portion of the core shown in A of FIG. 1. Figure 3 C of FIG. 1 is a perspective view schematically showing another example of the shape of the convex portion of the core shown in A of FIG. 1.

[0015] Figure 4 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 3 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 4 B of FIG. 1 is a perspective view schematically showing another example of the shape of the convex portion of the core shown in A of FIG. 1. Figure 3 B of FIG. 1 is a perspective view schematically showing another example of the shape of the convex portion of the core shown in A of FIG. 1.

[0016] Figure 5 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 5 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 5 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1.

[0017] Figure 6 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 6 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 6 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1.

[0018] Figure 7-1 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 7-1 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 7-1 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1.

[0019] Figure 7-2 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 7-1 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 7-2 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 7-2 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1.

[0020] Figure 7-3 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 7-1 A of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 7-3 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1. Figure 7-3 B of FIG. 1 is a perspective view schematically showing the shape of the convex portion of the core shown in A of FIG. 1.

[0021] Figure 8 is a partially enlarged cross-sectional view schematically showing a convex portion of the fourth modification example.

[0022] Figure 9 is a partially enlarged cross-sectional view schematically showing a convex portion of the fifth modification example.

[0023] Figure 10 is a partially enlarged cross-sectional view schematically showing a core of the first modification example.

[0024] Figure 11 is a partially enlarged cross-sectional view schematically showing a convex portion in the core shown in Figure 10

[0025] Figure 12 is a partially enlarged cross-sectional view schematically showing a convex portion in the core shown in Figure 10

[0026] Figure 13 is a partially enlarged cross-sectional view schematically showing a core of the second modification example.

[0027] Figure 14 is a plan view schematically showing a core of the third modification example.

[0028] Figure 15 is a cross-sectional view schematically showing a heat diffusion device of the first modification example.

[0029] Figure 16 is a cross-sectional view schematically showing a heat diffusion device of the second modification example.

[0030] Figure 17 is a plan view seen from the hole body side of the core shown in A of the first modification example. Figure 3

[0031] Figure 18 is a cross-sectional view of the core shown in along the A-A line. Figure 17

[0032] Figure 19 is a diagram for explaining the definition of a convex portion in the core shown in Figure 11

[0033] Figure 20 is a diagram for explaining the definition of a convex portion in the core shown in Figure 18 DETAILED DESCRIPTION

[0034] Hereinafter, the heat diffusion device of the present application will be described.

[0035] ​​​​​​However, the present application is not limited to the following embodiments, and can be applied with appropriate changes within the scope of the gist of the present application. In addition, a structure in which two or more of the structures described below are combined is also the present application.

[0036] Hereinafter, as one embodiment of the heat spreading device of the present application, a vapor chamber will be described as an example. The heat spreading device of the present application can also be applied to a heat pipe or the like.

[0037] The drawings shown below are schematic, and the size, the scale of the aspect ratio, and the like can be different from those of actual products.

[0038] Figure 1 is a perspective view schematically showing one example of the heat spreading device of the present application. Figure 2 is Figure 1 is one example of a cross-sectional view of the heat spreading device shown in

[0039] Figure 1 and Figure 2 The vapor chamber (heat spreading device) 1 shown in FIG. 1 is provided with a hollow housing 10 that is sealed in airtight state. The housing 10 has a first inner wall surface 11a and a second inner wall surface 12a that face each other in the thickness direction Z. The vapor chamber 1 is further provided with a working medium 20 that is enclosed in the internal space of the housing 10, and a wick 30 that is disposed in the internal space of the housing 10.

[0040] An evaporation portion that evaporates the enclosed working medium 20 is provided in the housing 10. As shown in Figure 1 A heat source HS as a heating element is disposed on the outer wall surface of the housing 10. As the heat source HS, an electronic component such as a central processing unit (CPU) or the like of an electronic device can be cited. The portion in the internal space of the housing 10 that is near the heat source HS and is heated by the heat source HS corresponds to the evaporation portion.

[0041] It is preferable that the entire vapor chamber 1 be flat. That is, it is preferable that the entire housing 10 be flat. Here, "flat" includes a plate shape and a sheet shape, and refers to a shape in which the width direction X (hereinafter, referred to as width) and the length direction Y (hereinafter, referred to as length) are substantially larger than the size in the thickness direction Z (hereinafter, referred to as thickness or height), such as a shape in which the width and the length are 10 times or more, and preferably 100 times or more, the thickness.

[0042] The size of the vapor chamber 1, i.e., the size of the housing 10 is not particularly limited. The width and length of the vapor chamber 1 can be appropriately set according to the use. The width and length of the vapor chamber 1 are, for example, each 5 mm or more and 500 mm or less, 20 mm or more and 300 mm or less, or 50 mm or more and 200 mm or less. The width and length of the vapor chamber 1 can be the same or different.

[0043] The housing 10 is preferably composed of the first sheet 11 and the second sheet 12 which are joined at the outer edge portions thereof.

[0044] In the case where the housing 10 is composed of the first sheet 11 and the second sheet 12, the material constituting the first sheet 11 and the second sheet 12 is not particularly limited as long as it has properties suitable for use as a vapor chamber, such as thermal conductivity, strength, flexibility, and the like. The material constituting the first sheet 11 and the second sheet 12 is preferably a metal, such as copper, nickel, aluminum, magnesium, titanium, iron, or an alloy in which these are the main components, and is particularly preferably copper. The material constituting the first sheet 11 and the second sheet 12 can be the same or different, but is preferably the same.

[0045] In the case where the housing 10 is composed of the first sheet 11 and the second sheet 12, the first sheet 11 and the second sheet 12 are joined to each other at the outer edge portions thereof. The method of such joining is not particularly limited, but, for example, laser welding, resistance welding, diffusion bonding, brazing, TIG welding (tungsten-inert gas welding), ultrasonic bonding, or resin sealing can be used, and laser welding, resistance welding, or brazing is preferably used.

[0046] The thickness of the first sheet 11 and the second sheet 12 is not particularly limited, but is preferably 10 μm or more and 200 μm or less, more preferably 30 μm or more and 100 μm or less, and further preferably 40 μm or more and 60 μm or less, respectively. The thickness of the first sheet 11 and the second sheet 12 can be the same or different. Furthermore, the thickness of each of the first sheet 11 and the second sheet 12 can be the same overall or can be thinner in part.

[0047] The shape of the first sheet 11 and the second sheet 12 is not particularly limited. For example, the first sheet 11 and the second sheet 12 can each be a shape in which the outer edge portion is thicker than the portion other than the outer edge portion.

[0048] The thickness of the vapor chamber 1 as a whole is not particularly limited, but is preferably 50 μm or more and 500 μm or less.

[0049] The planar shape of the case 10 as viewed in the thickness direction Z is not particularly limited, and for example, polygons such as a triangle or a rectangle, a circle, an ellipse, a shape obtained by combining these shapes, and the like can be cited. Further, the planar shape of the case 10 can be a letter L shape, a letter C shape (Kana shape), a stepped shape, or the like. Further, the case 10 can have a through hole. The planar shape of the case 10 can also be a shape corresponding to the purpose of the vapor chamber, the shape of the assembly site of the vapor chamber, or other components present in the vicinity.

[0050] The working medium 20 is not particularly limited as long as it is a medium that can undergo a gas-liquid phase change in the environment within the case 10, and for example, water, alcohol, Freon substitutes, or the like can be used. For example, the working medium 20 is an aqueous compound, and preferably water.

[0051] The wick 30 has a capillary structure that can move the working medium 20 by capillary force.

[0052] The size and shape of the wick 30 are not particularly limited, but for example, it is preferable that the wick 30 be continuously disposed in the internal space of the case 10. It can also be that the wick 30 is disposed in the entire internal space of the case 10 as viewed in the thickness direction Z, or it can also be that the wick 30 is disposed in a part of the internal space of the case 10 as viewed in the thickness direction Z.

[0053] Figure 3 A of FIG. 1 is a schematic view of a heat spreading device according to an embodiment of the present application. Figure 2 FIG. 2 is a partially enlarged cross-sectional view of one example of a wick and a working medium of the heat spreading device shown in FIG. 1.

[0054] As shown in A of FIG. 1, the wick 30 includes a support body 31 that is in contact with the first inner wall surface 11a, and a porous body 32 that is in contact with the support body 31. Figure 2 Figure 3 As shown in A of FIG. 1, the wick 30 includes a support body 31 that is in contact with the first inner wall surface 11a, and a porous body 32 that is in contact with the support body 31.

[0055] In the wick 30, the porous body 32 is composed of the same material as the support body 31. In the case where the porous body 32 is composed of the same material as the support body 31, the material that constitutes the support body 31 and the porous body 32 is not particularly limited, but for example, resins, metals, ceramics, or mixtures or laminates thereof, and the like can be cited. It is preferable that the material that constitutes the support body 31 and the porous body 32 be a metal.

[0056] Further, in the wick 30, the support body 31 and the porous body 32 can be integrally composed. In the present specification, "the support body 31 and the porous body 32 are integrally composed" means that there is no interface between the support body 31 and the porous body 32, and specifically, means that a boundary cannot be distinguished between the support body 31 and the porous body 32.

[0057] ​The core 30 in which the support body 31 and the hole body 32 are integrated can be manufactured, for example, by an etching technique, a printing technique based on multilayer coating, another multilayer technique, or the like.

[0058] In the core 30, in a case where the hole body 32 is made of the same material as the support body 31, the support body 31 and the hole body 32 are not integrated. For example, in the core 30 in which a copper pillar as the support body 31 and a copper mesh as the hole body 32 are fixed by diffusion bonding or spot welding or the like, it is difficult to bond the support body 31 and the hole body 32 throughout the surface, and thus a gap is generated between the support body 31 and the hole body 32 in a local part. In such a core 30, a boundary between the support body 31 and the hole body 32 is recognized, and thus it can be said that although the support body 31 and the hole body 32 are not integrated, the hole body 32 is made of the same material as the support body 31.

[0059] Figure 4 A of FIG. 1 is a plan view of the core 30 as viewed from the support body side. Figure 3 A of FIG. 1 is a plan view of the core 30 as viewed from the support body side. Figure 4 B of FIG. 1 is another example of the plan view of the core 30 as viewed from the support body side. Figure 3 B of FIG. 1 is another example of the plan view of the core 30 as viewed from the support body side.

[0060] In the core 30, the support body 31 includes, for example, a plurality of columnar members. By holding the working medium 20 in a liquid phase between the columnar members, the heat transport performance of the vapor chamber 1 can be improved. Here, "columnar" means a shape in which the length of the long side of the bottom surface is less than 5 times the length of the short side of the bottom surface.

[0061] The shape of the columnar member is not particularly limited, but for example, a cylindrical shape, a prismatic shape, a truncated conical shape, a truncated pyramidal shape, or the like can be cited. In the example shown in A of FIG. 1, the cross-sectional shape of the support body 31 perpendicular to the height direction is a quadrangular shape, and in the example shown in B of FIG. 1, the cross-sectional shape of the support body 31 perpendicular to the height direction is a circular shape. Figure 4 Figure 4 The columnar member can have a shape other than the above shapes. For example, the columnar member can have a shape in which the height is relatively high only at the center of the bottom surface.

[0062] The columnar member can have a shape other than the above shapes. For example, the columnar member can have a shape in which the height is relatively high only at the center of the bottom surface.

[0063] The shape of the support body 31 is not particularly limited, but as shown in A of FIG. 1 and B of FIG. 1, the support body 31 can have a shape in which the height is relatively high only at the center of the bottom surface. Figure 2 Figure 3 ​​As shown in A of FIG. 10, the support body 31 preferably has a tapered shape in which the width narrows from the hole body 32 toward the first inner wall surface 11a. Thereby, it is possible to suppress the dropping of the hole body 32 between the support bodies 31, and to expand the flow path between the support bodies 31 on the case 10 side. As a result thereof, the transmittance rises, and the maximum heat transport amount becomes large.

[0064] The arrangement of the support body 31 is not particularly limited, but it is preferable that the support bodies 31 be arranged uniformly in a predetermined region, and it is more preferable that the support bodies 31 be arranged uniformly throughout the entirety, for example, so as to make the center-to-center distance (pitch) of the support bodies 31 constant.

[0065] The center-to-center distance (pitch) of the support bodies 31 is, for example, 60 μm or more and 800 μm or less. The width (W31) of the support body 31 is, for example, 20 μm or more and 500 μm or less. The height (T31) of the support body 31 is, for example, 10 μm or more and 100 μm or less. Figure 4 Figure 4 In A of FIG. 10 or B of FIG. 10, the length indicated by P31 is, for example, 60 μm or more and 800 μm or less. The width (W31) of the support body 31 is, for example, 20 μm or more and 500 μm or less. The height (T31) of the support body 31 is, for example, 10 μm or more and 100 μm or less. Figure 4 Figure 4 In A of FIG. 10 or B of FIG. 10, the length indicated by W31 is, for example, 20 μm or more and 500 μm or less. The height (T31) of the support body 31 is, for example, 10 μm or more and 100 μm or less. Figure 3

[0066] The hole body 32 has a through hole 33 that penetrates in the thickness direction Z. The working medium 20 is able to move within the through hole 33 by capillary phenomenon. It is preferable that, when viewed from the thickness direction Z, the through hole 33 be provided in a portion in which the support body 31 is not present. The shape of the through hole 33 is not particularly limited, but it is preferable that the cross section at a face perpendicular to the thickness direction Z be circular or elliptical.

[0067] The arrangement of the through hole 33 of the hole body 32 is not particularly limited, but it is preferable that the through holes 33 be arranged uniformly in a predetermined region, and it is more preferable that the through holes 33 be arranged uniformly throughout the entirety, for example, so as to make the center-to-center distance (pitch) of the through holes 33 of the hole body 32 constant.

[0068] The center-to-center distance (pitch) of the through holes 33 of the hole body 32 is, for example, 3 μm or more and 150 μm or less. The diameter of the end face of the through hole 33 on the first inner wall surface 11a side (φ33) is, for example, 100 μm or less. The thickness (T32) of the hole body 32 is, for example, 5 μm or more and 50 μm or less. Figure 4 Figure 4 In A of FIG. 10 or B of FIG. 10, the length indicated by P33 is, for example, 3 μm or more and 150 μm or less. The diameter of the end face of the through hole 33 on the first inner wall surface 11a side (φ33) is, for example, 100 μm or less. The thickness (T32) of the hole body 32 is, for example, 5 μm or more and 50 μm or less. Figure 4 Figure 4 In A of FIG. 10 or B of FIG. 10, the length indicated by φ33 is, for example, 100 μm or less. The thickness (T32) of the hole body 32 is, for example, 5 μm or more and 50 μm or less. Note that the thickness of the hole body 32 refers to the thickness of the hole body 32 at a portion in which the protrusion 34 described later is not provided. Figure 3

[0069] ​​​​​​A protrusion 34 is provided on the periphery of the through-hole 33 and in a direction approaching the first inner wall surface 11a.

[0070] Figure 3 B is a perspective view schematically showing Figure 3 A is a perspective view schematically showing the shape of the protrusion of the wick.

[0071] The protrusion 34 has a first end portion 35 on the first inner wall surface 11a side and a second end portion 36 on the second inner wall surface 12a side.

[0072] Figure 3 In the example shown in B, the protrusion 34 has a cylindrical shape. In this way, the protrusion 34 has, for example, a cylindrical shape in which the first end portion 35 is flat. In this case, the protrusion 34 can also have a square cylindrical shape, or a shape in which the inside of a truncated cone, a truncated pyramid, or the like is hollow.

[0073] Figure 3 In A, the working medium 20 is drawn up into the through-hole 33 by capillary force due to contact with the surface surrounded by the inner wall of the protrusion 34. Therefore, for a portion of the wick 30 in which the through-hole 33 is not present as viewed in the thickness direction Z, the working medium 20 can be drawn up into the through-hole 33 even though the liquid surface of the working medium 20 is located on the first inner wall surface 11a side than the hole body 32. In this way, for the vapor chamber 1, the working medium 20 can be drawn up into the through-hole 33 even in a case in which the liquid amount of the working medium 20 is small. Therefore, even in a case in which the liquid amount of the working medium 20 is small, it is possible to prevent a situation in which capillary force is not easily generated in the wick 30. According to the above, the vapor chamber 1 can suppress a decrease in the heat spreading performance and the heat transport performance even in a case in which the liquid amount of the working medium 20 is small.

[0074] For the vapor chamber 1, a decrease in the heat spreading performance and the heat transport performance can be suppressed even in a case in which the liquid amount of the working medium 20 is small, and therefore, for example, the influence of a change in the design value of the liquid injection amount of the working medium 20 in the manufacturing process, inconsistency in the liquid injection amount of the working medium 20 in the manufacturing process, and a change in the liquid amount of the working medium 20 at the time of use on the heat spreading performance or the heat transport performance is small. In other words, the vapor chamber 1 can be said to have excellent robustness with respect to the liquid amount of the working medium 20.

[0075] The protrusion 34 is preferably provided on the entire periphery of the through-hole 33. The protrusion 34 can be provided only on a portion of the periphery of the through-hole 33 as long as it is a shape that can draw up the working medium 20 by capillary force.

[0076] The protrusion 34 may be provided on the periphery of all the through holes 33 in the porous body 32, or it may be provided only on the periphery of a portion of the through holes 33 in the porous body 32. Preferably, when the protrusion 34 is provided only on the periphery of a portion of the through holes 33 in the porous body 32, the protrusion 34 is provided at least on the periphery of the through holes 33 located directly above the heat source HS. When the protrusion 34 is provided on the through holes 33 located directly above the heat source HS, even when the liquid volume of the working medium 20 is small, the evaporation of the working medium 20 in the evaporation section can be suppressed. Alternatively, the protrusion 34 may be provided only on the periphery of the through holes 33 located directly above the heat source HS.

[0077] The through hole 33 and the protrusion 34 can be manufactured, for example, by blanking the metal constituting the hole body 32 through a stamping process. In the blanking process, the formation and shape of the protrusion can be adjusted by appropriately adjusting the blanking depth, etc. In addition, the blanking depth refers to, for example, the extent to which the punch is pressed in the blanking direction when blanking is performed by the punch.

[0078] The dimensions of the protrusion 34 are not particularly limited. For example, the height of the protrusion 34 can be greater than the diameter of the through hole 33, the height of the protrusion 34 can be less than the diameter of the through hole 33, or the height of the protrusion 34 can be the same as the diameter of the through hole 33. Furthermore, in Figure 3 A and Figure 3 In the protrusion 34 of B, the height of the protrusion 34 refers to the distance in the thickness direction Z between the first end 35 and the second end 36.

[0079] Figure 3 The C is schematically represented. Figure 3 A perspective view of another example of the shape of the protrusion of the core shown in A.

[0080] for Figure 3 Regarding the protrusion 34 shown in C, the first end portion 35 is not flat, but has irregularities. Furthermore, when the first end portion 35 has irregularities, the height of the protrusion 34 refers to the maximum distance between the first end portion 35 and the second end portion 36 in the thickness direction Z.

[0081] Figure 5 A is a partially enlarged cross-sectional view schematically representing the first modified example of the convex portion. Figure 5 B is a schematic representation. Figure 5 A three-dimensional view of the shape of the convex part shown in Figure A.

[0082] Figure 5 A and Figure 5The protrusion 34a shown in Figure B has a first end portion 35a on the side of the first inner wall surface 11a and a second end portion 36a on the side of the second inner wall surface 12a. When viewed from the thickness direction Z, the cross-sectional area of ​​the region enclosed by the inner wall of the first end portion 35a is smaller than the cross-sectional area of ​​the region enclosed by the inner wall of the second end portion 36a when viewed from the thickness direction Z. If the cross-sectional area of ​​the region enclosed by the inner wall of the first end portion 35a is smaller than the cross-sectional area of ​​the region enclosed by the inner wall of the second end portion 36a when viewed from the thickness direction Z, the capillary force generated in the region enclosed by the inner wall of the first end portion 35a can be increased. Therefore, the capillary force of the core 30 can be increased, and thus the maximum heat transfer capacity of the heat exchanger 1 can be increased.

[0083] Alternatively, in the protrusion 34a, when viewed from the thickness direction Z, the inner wall of the first end 35a is located further inward than the inner wall of the second end 36a.

[0084] In the cross section along the thickness direction Z, the protrusion 34a has a tapered shape in which the distance between the outer walls of the protrusion 34a narrows as it tends to approach the first inner wall surface 11a.

[0085] In the cross section along the thickness direction Z, the protrusion 34a is on the side facing the first inner wall surface 11a ( Figure 5 The shape protrudes from the lower side of A. In other words, in the cross section along the thickness direction Z, the protrusion 34a is oriented towards the first inner wall surface 11a relative to the line segment connecting the first end 35a and the second end 36a. Figure 5 The lower side of A) is curved.

[0086] Figure 6 A is a partially enlarged cross-sectional view schematically representing the second variation of the convex portion. Figure 6 B is a schematic representation. Figure 6 A three-dimensional view of the shape of the convex part shown in Figure A.

[0087] Figure 6 A and Figure 6 The protrusion 34b shown in B has a first end portion 35b on the side of the first inner wall surface 11a and a second end portion 36b on the side of the second inner wall surface 12a. In a cross section along the thickness direction Z, the protrusion 34b has a tapered shape in which the distance between the outer walls of the protrusion 34b narrows as it approaches the first inner wall surface 11a. In a cross section along the thickness direction Z, the protrusion 34b is on the side of the second inner wall surface 12a ( Figure 6 The shape protrudes from the upper side of A. In other words, in the cross section along the thickness direction Z, the protrusion 34b is positioned relative to the line segment connecting the first end 35b and the second end 36b towards the second inner wall surface 12a. Figure 6 The upper side of A) is curved.

[0088] Figure 7-1 A is a partially enlarged cross-sectional view schematically representing the third variation of the convex portion. Figure 7-1 B is a schematic representation. Figure 7-1 A three-dimensional view of the shape of the convex part shown in Figure A.

[0089] Figure 7-1 A and Figure 7-1 The protrusion 34c shown in Figure B has a first end portion 35c on the side of the first inner wall surface 11a and a second end portion 36c on the side of the second inner wall surface 12a. When viewed in the thickness direction Z, the cross-sectional area of ​​the region enclosed by the inner wall of the first end portion 35c is smaller than the cross-sectional area of ​​the region enclosed by the inner wall of the second end portion 36c for the protrusion 34c. The protrusion 34c has a cover portion 37 in the first end portion 35c that reduces the opening of the protrusion 34c. When viewed in the thickness direction Z for the protrusion 34c, the cross-sectional area of ​​the region enclosed by the inner wall of the first end portion 35c is smaller compared to the protrusion 34b, which does not have the cover portion 37 in the first end portion 35c.

[0090] Alternatively, the cover portion 37 that reduces the opening of the protrusion 34c can be formed, for example, by stamping the first end portion 35c. The size and shape of the cover portion 37 that reduces the opening of the protrusion 34c are not particularly limited; it is sufficient that the opening of the protrusion 34c on the side near the first end portion 35c is reduced. Preferably, the cover portion 37 that reduces the opening of the protrusion 34c is a flat surface. The cover portion 37 that reduces the opening of the protrusion 34c is preferably a flat surface perpendicular to the thickness direction Z. The cover portion 37 that reduces the opening of the protrusion 34c can also be partially or entirely curved. The cover portion 37 that reduces the opening of the protrusion 34c can also have a surface with unevenness. The thickness of the cover portion 37 that reduces the opening of the protrusion 34c can be the same as or different from the thickness of the protrusion 34c.

[0091] exist Figure 7-1 A and Figure 7-1 In B, the cover portion 37 is disposed integrally at the first end portion 35c. Figure 7-1 A and Figure 7-1 In B, the center of the periphery of the through hole 33 at the first end 35c is aligned with the center of the periphery of the through hole 33 at the second end 36c.

[0092] Figure 7-2 A is a schematic representation. Figure 7-1 Another example of the convex portion shown in A is a partially enlarged cross-sectional view. Figure 7-2 B is a schematic representation. Figure 7-2 A three-dimensional view of the shape of the convex part shown in Figure A.

[0093] exist Figure 7-2 A and Figure 7-2In A of FIG. 10, the cover portion 37 is provided only on a part of the first end portion 35c. In B of FIG. 10, the cover portion 37 is provided only on a part of the convex portion 34c. Figure 7-2 In A of FIG. 11, the cover portion 37 is provided only on the left side of the convex portion 34c. In B of FIG. 11, the cover portion 37 is provided only on the right side of the convex portion 34c. Figure 7-2 In A of FIG. 12, the cover portion 37 is provided only on a part of the first end portion 35c. In B of FIG. 12, the cover portion 37 is provided only on a part of the convex portion 34c. Figure 7-3 In A of FIG. 13, the center of the periphery of the through-hole 33 of the first end portion 35c is not aligned with the center of the periphery of the through-hole 33 of the second end portion 36c. In B of FIG. 13, the center of the periphery of the through-hole 33 of the first end portion 35c is aligned with the center of the periphery of the through-hole 33 of the second end portion 36c.

[0094] Figure 7-1 A of FIG. 14 is a partially enlarged cross-sectional view schematically showing another example of the convex portion shown in A of FIG. 14. Figure 7-3 A of FIG. 15 is a perspective view schematically showing the shape of the convex portion shown in A of FIG. 15. Figure 7-3 B of FIG. 15 is a perspective view schematically showing the shape of the convex portion shown in B of FIG. 15. Figure 7-3

[0095] In A of FIG. 16, the cover portion 37 is provided only on a part of the first end portion 35c. In B of FIG. 16, the cover portion 37 is provided only on a part of the convex portion 34c. Figure 7-3 In A of FIG. 17, the cover portion 37 is provided only on the right side of the convex portion 34c. In B of FIG. 17, the cover portion 37 is provided only on the left side of the convex portion 34c. Figure 7-3 In A of FIG. 18, the cover portion 37 is provided only on a part of the first end portion 35c. In B of FIG. 18, the cover portion 37 is provided only on a part of the convex portion 34c. Figure 7-3 In A of FIG. 19, the cover portion 37 is provided only on the right side of the convex portion 34c. In B of FIG. 19, the cover portion 37 is provided only on the left side of the convex portion 34c. Figure 7-1 In A of FIG. 20, the cover portion 37 is provided only on a part of the first end portion 35c. In B of FIG. 20, the cover portion 37 is provided only on a part of the convex portion 34c. Figure 7-1 In A of FIG. 21, Figure 7-2 In B of FIG. 21, Figure 7-2 In A of FIG. 22, the cover portion 37 is a flat surface perpendicular to the thickness direction Z. In B of FIG. 22, the cover portion 37 is provided so as to extend toward the first inner wall surface 11a side (the lower side of A of FIG. 22). Figure 7-3 In A of FIG. 23, the cover portion 37 is a flat surface perpendicular to the thickness direction Z. In B of FIG. 23, the cover portion 37 is provided so as to extend toward the first inner wall surface 11a side (the lower side of A of FIG. 23). Figure 7-3 In A of FIG. 24, the cover portion 37 is a flat surface perpendicular to the thickness direction Z. In B of FIG. 24, the cover portion 37 is provided so as to extend toward the first inner wall surface 11a side (the lower side of A of FIG. 24). Figure 7-3 In A of FIG. 25, the cover portion 37 is a flat surface perpendicular to the thickness direction Z. In B of FIG. 25, the cover portion 37 is provided so as to extend toward the first inner wall surface 11a side (the lower side of A of FIG. 25). Figure 7-3 In A of FIG. 26, the cover portion 37 is a flat surface perpendicular to the thickness direction Z. In B of FIG. 26, the cover portion 37 is provided so as to extend toward the first inner wall surface 11a side (the lower side of A of FIG. 26). Figure 7-3 In A of FIG. 27, the cover portion 37 is a flat surface perpendicular to the thickness direction Z. In B of FIG. 27, the cover portion 37 is provided so as to extend toward the first inner wall surface 11a side (the lower side of A of FIG. 27). Figure 8 In A of FIG. 28, the cover portion 37 is a flat surface perpendicular to the thickness direction Z. In B of FIG. 28, the cover portion 37 is provided so as to extend toward the first inner wall surface 11a side (the lower side of A of FIG. 28).

[0096] Figure 8 A of FIG. 29 is a partially enlarged cross-sectional view schematically showing a fourth modification example of the convex portion.

[0097] Figure 9 ​The protrusion 34d has a first end portion 35d on the first inner wall surface 11a side and a second end portion 36d on the second inner wall surface 12a side. When viewed in the thickness direction Z, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35d is larger than the cross-sectional area of the region surrounded by the inner wall of the second end portion 36d. If the cross-sectional area of the region surrounded by the inner wall of the first end portion 35d is larger than the cross-sectional area of the region surrounded by the inner wall of the second end portion 36d when viewed in the thickness direction Z, the amount of the working medium 20 drawn into the through-hole 33 can be increased. If the amount of the working medium 20 drawn into the through-hole 33 is large, the allowable variation of the working medium 20 until the working medium 20 is completely drawn into the through-hole 33 increases in the case where the working medium 20 in the vapor chamber 1 is reduced. Therefore, the robustness of the vapor chamber 1 with respect to the liquid amount of the working medium 20 is improved.

[0098] Also, when viewed in the thickness direction Z, the inner wall of the first end portion 35d can be located further outward than the inner wall of the second end portion 36d in the protrusion 34d.

[0099] Figure 9 FIG. 18 is a partially enlarged cross-sectional view schematically showing a fifth modification of the protrusion.

[0100] Figure 10 The protrusion 34e has a first end portion 35e on the first inner wall surface 11a side and a second end portion 36e on the second inner wall surface 12a side. When viewed in the thickness direction Z, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35e is larger than the cross-sectional area of the region surrounded by the inner wall of the second end portion 36e. The protrusion 34e has a cover portion 37 that reduces the opening of the protrusion 34e at the first end portion 35e. For the protrusion 34e, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35e is narrower when viewed in the thickness direction Z than in the protrusion 34d in which the cover portion 37 is not present in the first end portion 35e.

[0101] The cover portion 37 that reduces the opening of the protrusion 34e can be formed, for example, by press working the first end portion 35e. The size and shape of the cover portion 37 that reduces the opening of the protrusion 34e are not particularly limited, and it is only necessary to reduce the opening of the protrusion 34e on the first end portion 35e side. The cover portion 37 that reduces the opening of the protrusion 34e is preferably a flat surface. The cover portion 37 that reduces the opening of the protrusion 34e is preferably a flat surface perpendicular to the thickness direction Z. The cover portion 37 that reduces the opening of the protrusion 34e can be partially or entirely curved. The cover portion 37 that reduces the opening of the protrusion 34e can have a concave-convex shape on the surface. The thickness of the cover portion 37 that reduces the opening of the protrusion 34e can be the same as or different from the thickness of the protrusion 34e.

[0102] Figure 10 This is a partially enlarged cross-sectional view schematically representing the first modified example of the core.

[0103] exist Figure 10 In the core 30A shown, a support 31 is formed in the recessed portion by locally bending and recessing the metal foil, for example, through a stamping process. A vapor space is formed in the recessed portion of the support 31, thus improving thermal conductivity. (Not limited to...) Figure 10 The example shown could also be that, in the case of stamping a metal foil, depending on the stamping process, a through hole is formed in the recessed portion when the metal foil is partially bent.

[0104] Ideally, the thickness of the metal foil should be constant before stamping or other processing. However, there are also cases where the metal foil becomes thinner in the bent portion. Based on the above, it is preferable that the thickness of the support 31 in the core 30A is the same as or smaller than the thickness of the perforated body 32.

[0105] The core 30A is preferably formed by stamping the support 31 and the through hole 33 and the protrusion 34 together.

[0106] Alternatively, in the core 30A, the thickness of the protrusion 34 can be the same as the thickness of the support 31. Alternatively, in the core 30A, the thickness of the protrusion 34 can be the same as the thickness of the perforated body 32. For example... Figure 11 As shown, in the core 30A, the thickness of the support 31, the thickness of the perforated body 32, and the thickness of the protrusion 34 can also be constant.

[0107] Alternatively, in the core 30A, the thickness of the protrusion 34 may be different from the thickness of the support 31. Alternatively, in the core 30A, the thickness of the protrusion 34 may be different from the thickness of the perforated body 32.

[0108] Figure 10 It is a schematic representation Figure 11 A partially enlarged cross-sectional view of the first modified example of the protrusion in the core shown.

[0109] Figure 6 The convex portion 34b shown has the same Figure 6 A and Figure 11 The protrusion 34b shown in Figure B has the same shape. The protrusion 34b has a first end portion 35b on the side of the first inner wall surface 11a and a second end portion 36b on the side of the second inner wall surface 12a. In a cross-section along the thickness direction Z, the protrusion 34b has a tapered shape in which the distance between the outer walls of the protrusion 34b narrows towards the first inner wall surface 11a. In a cross-section along the thickness direction Z, the protrusion 34b becomes towards the second inner wall surface 12a (… Figure 11a convex shape. In other words, in a cross section along the thickness direction Z, the convex portion 34b becomes convex with respect to a line segment connecting the first end portion 35b and the second end portion 36b to the second inner wall surface 12a side (the upper side) in the cross section. Figure 12 a curved shape.

[0110] The thickness of the convex portion 34b can be the same as or different from the thickness of the support body 31. The thickness of the convex portion 34b can be the same as or different from the thickness of the hole body 32.

[0111] Figure 10 is a partially enlarged cross-sectional view schematically showing a second modification example of the core. Figure 12 is a partially enlarged cross-sectional view schematically showing a second modification example of the core.

[0112] Figure 7-1 The convex portion 34c shown in Figure 7-1 A of the convex portion 34c shown in Figure 10 B. The convex portion 34c has a first end portion 35c on the first inner wall surface 11a side and a second end portion 36c on the second inner wall surface 12a side. When viewed in the thickness direction Z, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35c is smaller than the cross-sectional area of the region surrounded by the inner wall of the second end portion 36c for the convex portion 34c. The convex portion 34c has a cover portion 37 that reduces the opening of the convex portion 34c in the first end portion 35c.

[0113] The thickness of the convex portion 34c can be the same as or different from the thickness of the support body 31. The thickness of the convex portion 34c can be the same as or different from the thickness of the hole body 32. The thickness of the cover portion 37 that reduces the opening of the convex portion 34c can be the same as or different from the thickness of the support body 31. The thickness of the cover portion 37 that reduces the opening of the convex portion 34c can be the same as or different from the thickness of the hole body 32.

[0114] Figure 5 The convex portion 34 shown in Figure 5 A and Figure 8 B. The convex portion 34a shown in Figure 9 the convex portion 34d shown in Figure 13 the convex portion 34e shown in

[0115] Figure 13 is a partially enlarged cross-sectional view schematically showing a second modification example of the core.

[0116] For the convex portion 34 shown in Figure 13The hole body 32 is made of a different material from the support body 31 in the core 30B shown. The material that constitutes the support body 31 is not particularly limited, but for example, resin, metal, ceramic, or a mixture, a laminate, or the like thereof can be listed. The material that constitutes the hole body 32 is not particularly limited, but for example, resin, metal, ceramic, or a mixture, a laminate, or the like thereof can be listed. It is preferable that the material that constitutes the hole body 32 be metal.

[0117] Figure 5 The protrusion 34 shown can also be the same shape as the protrusion 34a shown in A and B of Figure 5 Figure 6 the protrusion 34b shown in A and B of Figure 6 Figure 7-1 the protrusion 34c shown in A and B of Figure 7-1 Figure 7-2 the protrusion 34c shown in A and B of Figure 7-2 Figure 7-3 the protrusion 34c shown in A and B of Figure 7-3 Figure 8 the protrusion 34c shown in A and B of Figure 9 the protrusion 34d shown in Figure 14 the protrusion 34e shown in

[0118] Figure 14 is a plan view that schematically represents a third modification example of the core. In addition, Figure 14 is a plan view of the core as viewed from the support body side.

[0119] For the core 30C shown in Figure 14 , the support body 31 includes a plurality of rail-shaped members. By holding the working medium 20 in a liquid phase between the rail-shaped members, it is possible to improve the heat transport performance of the heat spreader 1. Here, "rail-shaped" means a shape in which the length of the long side of the bottom surface is 5 times or more the length of the short side of the bottom surface.

[0120] The cross-sectional shape of the rail-shaped member perpendicular to the extending direction is not particularly limited, but for example, a polygon such as a quadrilateral, a semicircle, a semioval, a shape obtained by combining them, or the like can be listed.

[0121] The rail-shaped member can be relatively high in height than the surrounding. Thus, the rail-shaped member includes, in addition to the portion that protrudes from the first inner wall surface 11a, a portion that is relatively high in height due to the groove formed in the first inner wall surface 11a.

[0122] In addition, the core 30C is not limited to Figure 2 ​​​​​The disclosed shape can also be used by being arranged in a part of the internal space, rather than the entirety of the internal space. For example, the support body 31 can be formed in a rail shape along the outer periphery of the internal space, and the hole body 32 having a shape along the outer periphery can be arranged on the support body 31.

[0123] As shown in Figure 2 , a support pillar 40 can be arranged in the internal space of the housing 10 in contact with the second inner wall surface 12a. The housing 10 and the wick 30 can be supported by arranging the support pillar 40 in the internal space of the housing 10.

[0124] The material constituting the support pillar 40 is not particularly limited, but for example, resin, metal, ceramic, or a mixture, laminate, or the like thereof can be listed. In addition, the support pillar 40 can be integrated with the housing 10, and for example, can be formed by etching processing or the like of the second inner wall surface 12a of the housing 10.

[0125] The shape of the support pillar 40 is not particularly limited as long as it is a shape capable of supporting the housing 10 and the wick 30, but as the shape of the cross section perpendicular to the height direction of the support pillar 40, for example, a polygon such as a rectangle, a circle, an ellipse, or the like can be listed.

[0126] The height of the support pillar 40 can be the same in one heating plate, or can be different.

[0127] In Figure 15 the cross section shown, the width of the support pillar 40 is not particularly limited as long as it gives strength capable of suppressing deformation of the housing 10, but the equivalent circle diameter of the cross section perpendicular to the height direction of the end portion of the support pillar 40 is, for example, 100 μm or more and 2000 μm or less, and is preferably 300 μm or more and 1000 μm or less. By increasing the equivalent circle diameter of the support pillar 40, it is possible to more suppress the deformation of the housing 10. On the other hand, by making the equivalent circle diameter of the support pillar 40 smaller, it is possible to more ensure a space for moving the vapor of the working medium 20.

[0128] The arrangement of the support pillar 40 is not particularly limited, but it is preferable to be arranged uniformly in a predetermined region, and more preferably to be arranged uniformly throughout the entirety, for example, so as to make the distance between the support pillars 40 constant. By uniformly arranging the support pillars 40, it is possible to ensure uniform strength throughout the entirety of the heating plate 1.

[0129] Figure 15 is a cross-sectional view schematically showing a first modification of the heat spreading device.

[0130] For Figure 15In the vapor chamber (heat diffusion device) 1A shown, the support 31 is integrally formed with the first sheet 11 of the housing 10. In the vapor chamber 1A, the first sheet 11 and the support 31 can be manufactured, for example, by etching technology, multilayer coating-based printing technology, or other multilayer technologies. Figure 16 As shown, the perforated body 32 is preferably made of a different material than the support body 31. In the heat spreader (heat diffusion device) 1A, the perforated body 32 may also be made of the same material as the support body 31 and the first sheet 11 of the housing 10, or the perforated body 32 may be integrally formed with the support body 31 and the first sheet 11 of the housing 10.

[0131] Figure 16 This is a cross-sectional view schematically showing a second modified example of a heat diffusion device.

[0132] for Figure 17 In the case of the heat spreader (heat diffusion device) 1B shown, for example, a support 31 is formed in the recessed portion by locally bending and recessing the first inner wall surface 11a of the housing 10 using stamping or the like.

[0133] Figure 3 Viewed from the side of the perforated body Figure 18 The top view of the first deformed example of the core shown in Figure A. Figure 17 yes Figure 18 The core shown is a cross-sectional view along line AA.

[0134] for Figure 18 Regarding the core 30D shown, in the cross-section along the thickness direction Z, the protrusions 34 are curved relative to each other, and there are no flat portions. Furthermore, Figure 19 This is a cross-sectional view through the through hole 33, but in the section along the thickness direction Z that does not pass through the through hole 33, the protrusions 34 may or may not have flat portions between them. Alternatively, in the core 30D, the perforated body 32 may be entirely curved, without any flat portions.

[0135] Figure 11 It is used for Figure 19 The diagram illustrates the definition of the protrusions in the core. Figure 11 Besides adding lines L1 and L2, the others are... Figure 19 Same diagram.

[0136] In this specification, in a cross-section along the thickness direction Z, a protrusion is defined as the portion between straight lines L1 and L2 as follows. Furthermore, when multiple protrusions exist, straight lines L1 and L2 are defined for each protrusion. Figure 19 As shown, in a cross-section along the thickness direction Z, when on both sides of the through hole (Figure 19 In the case where the protrusions exist on both the right and left sides of the core 30A, straight lines L1 and L2 are set for each of the protrusions. In the definition of the protrusions described below, a plane (XY plane) perpendicular to the thickness direction Z is referred to as a reference plane. Hereinafter, the reference plane is referred to as the XY plane. Figure 19 The straight lines L1 and L2 are described taking the core 30A shown in FIG. 6 as an example.

[0137] First, a straight line that passes through a point (point P1) existing on the first end portion 35b of the protrusion 34b existing on the periphery of the through-hole 33 on the first inner wall surface 11a side and existing on the most first inner wall surface 11a side and that is parallel to the reference plane is set as L1. Figure 19

[0138] Next, a straight line that passes through a point (point P2) existing on the surface of the core 30A on the first inner wall surface 11a side and existing on the most second inner wall surface 12a side and that is parallel to the reference plane is set as L2. Figure 20

[0139] In a cross section along the thickness direction Z, the portion of the core 30A on the straight line L2 becomes the second end portion 36b. When there are a plurality of portions of the core 30A on the straight line L2, the portion including the point having the smallest distance from the periphery of the through-hole 33 on the second inner wall surface 12a side becomes the second end portion 36b. The protrusion 34b extends from the second end portion 36b thus set to the first end portion 35b.

[0140] Figure 18 is a drawing for describing the definition of the protrusion in the core shown in FIG. 6. Figure 20 is a drawing that is the same as FIG. 6 except that straight lines L1 and L2 are added. Figure 18 Figure 20 In the core 30D shown in FIG. 8, straight lines L1 and L2 are also set in the same manner as in the core 30A. For the core 30D, the protrusions 34 become curved surfaces with respect to each other, and there is no flat portion, but the portion on the straight line L2 becomes the second end portion 36.

[0141] In the core 30D shown in FIG. 8, straight lines L1 and L2 are also set in the same manner as in the core 30A. For the core 30D, the protrusions 34 become curved surfaces with respect to each other, and there is no flat portion, but the portion on the straight line L2 becomes the second end portion 36. ​ The heat diffusion device of the present application is not limited to the above-described embodiments, and various applications and modifications can be made to the structure, manufacturing conditions, and the like of the heat diffusion device within the scope of the present application.

[0142] In the heat diffusion device of the present application, the housing can have one evaporation portion, or can have a plurality of evaporation portions. That is, one heat source or a plurality of heat sources can be provided on the outer wall surface of the housing. The number of evaporation portions and heat sources is not particularly limited.

[0143]

[0144] ​​​​In the heat diffusion device of the present application, in the case where the housing is composed of the first sheet and the second sheet, the first sheet and the second sheet can be overlapped with the end portions in alignment or can be overlapped with the end portions misaligned.

[0145] In the heat diffusion device of the present application, in the case where the housing is composed of the first sheet and the second sheet, the material constituting the first sheet and the material constituting the second sheet can be different. For example, by using a material with high strength for the first sheet, stress applied to the housing can be dispersed. Further, by making the materials different, one sheet or one function can be utilized and another function can be obtained with the other sheet. As the above-mentioned function, there is no particular limitation, and for example, heat conduction function, electromagnetic wave shielding function, etc. can be listed.

[0146] The heat diffusion device of the present application can be mounted on an electronic device for the purpose of heat dissipation. Therefore, an electronic device provided with the heat diffusion device of the present application is also one of the technical solutions of the present application. As the electronic device of the present application, for example, a smart phone, a tablet terminal, a notebook computer, a game machine, a wearable device, etc. can be listed. The heat diffusion device of the present application can work by itself without external power as described above, and can diffuse heat in two dimensions and at high speed using latent heat of evaporation and latent heat of condensation of the working medium. Therefore, by the electronic device provided with the heat diffusion device of the present application, heat dissipation can be effectively achieved in the limited space inside the electronic device.

[0147] Industrial applicability

[0148] The heat diffusion device of the present application can be used in a wide range of applications in the field of portable information terminals, etc. For example, it can be used for the purpose of reducing the temperature of a heat source such as a CPU, extending the use time of an electronic device, and can be used in a smart phone, a tablet terminal, a notebook computer, etc.

[0149] Explanation of reference numerals

[0150] 1, 1A, 1B... heat plate (heat spreading device); 10... housing; 11... 1st sheet; 11a... 1st inner wall surface; 12... 2nd sheet; 12a... 2nd inner wall surface; 20... working medium; 30, 30A, 30B, 30C, 30D... core; 31... support body; 32... perforated body; 33... through hole; 34, 34a, 34b, 34c, 34d, 34e... protrusion; 35, 35a, 35b, 35c, 35d, 35e... 1st end portion; 36, 36a, 36b, 36c, 36d, 36e... 2nd end portion; 37... cover portion; 40... support pillar; HS... heat source; P31... center-to-center distance of support body; P33... center-to-center distance of through hole; T31... height of support body; T32... thickness of perforated body; W31... width of support body; X... width direction; Y... length direction; Z... thickness direction; φ33... diameter of end surface of through hole on 1st inner wall surface side.

Claims

1. A heat diffusion device, characterized in that, have: A housing having a first inner wall surface and a second inner wall surface facing each other in the thickness direction; The working medium is sealed within the internal space of the housing; as well as A core, disposed within the internal space of the housing. The core includes a support body that contacts the first inner wall surface; And a perforated body that contacts the support body. The porous body has a through hole extending through the thickness direction. The support has a recessed portion. A protrusion is provided around the periphery of the through hole in the direction approaching the first inner wall surface.

2. The heat diffusion device according to claim 1, characterized in that, The protrusion has a first end portion against the first inner wall surface and a second end portion against the second inner wall surface. When viewed from the thickness direction, the cross-sectional area of ​​the region enclosed by the inner wall of the first end is smaller than the cross-sectional area of ​​the region enclosed by the inner wall of the second end.

3. The heat diffusion device according to claim 2, characterized in that, When viewed from the thickness direction, the inner wall of the first end is located further inward than the inner wall of the second end.

4. The heat diffusion device according to claim 1, characterized in that, The protrusion has a first end portion against the first inner wall surface and a second end portion against the second inner wall surface. When viewed from the thickness direction, the cross-sectional area of ​​the region enclosed by the inner wall of the first end is larger than the cross-sectional area of ​​the region enclosed by the inner wall of the second end.

5. The heat diffusion device according to claim 4, characterized in that, When viewed from the thickness direction, the inner wall of the first end is located on the outer side than the inner wall of the second end.

6. The heat diffusion device according to any one of claims 1 to 5, characterized in that, The thickness of the support body is the same as or less than the thickness of the perforated body.

7. The heat diffusion device according to any one of claims 1 to 5, characterized in that, The porous body is made of the same material as the support.

8. The heat diffusion device according to any one of claims 1 to 5, characterized in that, The porous body is made of a different material than the support body.

9. The heat diffusion device according to any one of claims 1 to 5, characterized in that, The support body includes multiple columnar components.

10. The heat diffusion device according to any one of claims 1 to 5, characterized in that, The support body includes multiple guide rail-like components.

11. The heat diffusion device according to any one of claims 1 to 5, characterized in that, The through hole is provided with a through hole that has capillary force.

12. The heat diffusion device according to any one of claims 1 to 5, characterized in that, The support body is formed by stamping the recessed portion.

13. The heat diffusion device according to claim 12, characterized in that, The through hole and the protrusion are formed by stamping.

14. The heat diffusion device according to claim 13, characterized in that, The core is formed by simultaneously performing stamping processes to form the support body and to form the through hole and the protrusion.

15. An electronic device, characterized in that, The device comprising any one of claims 1 to 14.

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