Thermal diffusion device and electronic device

Abstract

Provided are a heat dissipating device and an electronic device that have excellent heat source temperature lowering effects. A vapor chamber (1) as an embodiment of the heat dissipating device includes a housing (10) having a first inner surface (11a) and a second inner surface (12a) that face each other in a thickness direction (Z) and provided with an internal space, a working medium (20) enclosed in the internal space of the housing (10), and a wick (30) disposed in the internal space of the housing (10). The wick (30) includes a first wick (31). The first wick (31) is composed of a metal porous body and has a plurality of protrusions (40) or recesses (45) on a surface on the side of the first inner surface (11a) of the housing (10).

Description

Technical Field

[0001] This utility model relates to heat diffusion devices and electronic devices. Background Technology

[0002] In recent years, the increasing integration and performance of components have led to increased heat generation. Furthermore, the miniaturization of products has increased heat density, making heat dissipation strategies crucial. This is particularly evident in mobile devices such as smartphones and tablets. While graphite sheets are commonly used as heat dissipation components, their insufficient heat transfer necessitates research into various other heat dissipation components. Among these, the use of vapor chambers as planar heat pipes, which can effectively diffuse heat, is being investigated.

[0003] The vapor chamber has the following structure: a working medium (also called working fluid) is sealed inside the shell, and a core that transports the working medium using capillary force. The working medium absorbs heat from the heating elements in the evaporation section, which absorbs heat from heating elements such as electronic components, and evaporates within the vapor chamber. Afterward, the working medium moves within the vapor chamber, is cooled, and returns to a liquid phase. The liquid-phase working medium then moves again towards the evaporation section on the heating element side using the capillary force of the core, cooling the heating element. By repeating this process, the vapor chamber can operate autonomously without external power, utilizing the latent heat of vaporization and condensation of the working medium to achieve high-speed, two-dimensional heat diffusion.

[0004] Patent Document 1 discloses a heat spreader comprising: a shell; a column disposed within the interior space of the shell to support the shell from the inside; a working fluid sealed within the interior space of the shell; and a core disposed within the interior space of the shell, wherein at least a portion of the main inner surface of the shell is exposed to the interior space of the shell, and having fine pores with an average depth of 10 nm or more. Patent Document 1 describes that, for example, porous bodies, meshes, sintered bodies, nonwoven fabrics, filaments, etc., can be used as the material for the core.

[0005] Patent Document 2 discloses a heat diffusion device comprising: a housing having a first inner wall surface and a second inner wall surface opposite each other in the thickness direction; a working medium sealed in the internal space of the housing; and a core structure disposed in the internal space of the housing, the core structure comprising: a support portion that contacts the first inner wall surface; and a perforated portion formed of the same material as the support portion and integrally formed with the support portion.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2018-189349

[0009] Patent Document 2: International Publication No. 2023 / 090265 Utility Model Content

[0010] Problems to be solved by utility models

[0011] Heat diffusion devices such as vapor chambers are sometimes used in areas with high heat inputs of tens of W or even more than 100 W. Therefore, for the core located in the evaporation section near the heat source, in order to reduce the temperature of the heat source, it is required to receive more heat from the heat source and transfer more heat to the working medium so that the working medium evaporates more.

[0012] This invention was made to solve the aforementioned problems, and its purpose is to provide a heat diffusion device with excellent heat source temperature reduction effect. Furthermore, this invention aims to provide an electronic device including the aforementioned heat diffusion device.

[0013] Solution for solving the problem

[0014] The heat diffusion device of this invention includes: a housing having a first inner surface and a second inner surface opposite to each other in the thickness direction, and having an internal space; a working medium sealed in the internal space of the housing; and a core disposed in the internal space of the housing. The core includes a first core. The first core is made of a porous metal body and has a plurality of protrusions or recesses on the surface adjacent to the first inner surface of the housing.

[0015] Preferably, a hollow portion is formed between the surface of the first core and the second inner surface of the housing.

[0016] Preferably, the first core has a plurality of recesses or protrusions on the surface of the first core on the side of the second inner surface of the housing.

[0017] Preferably, the recess on the second inner surface side is located on the opposite side of the convex portion on the first inner surface side, and the convex portion on the second inner surface side is located on the opposite side of the recess on the first inner surface side.

[0018] Preferably, the thickness of the first core is constant.

[0019] Preferably, the surface of the first core on the side adjacent to the second inner surface of the housing is flat.

[0020] Preferably, the first core is disposed in a region that overlaps with the evaporation portion of the housing in the thickness direction.

[0021] Preferably, the core also includes a sheet-like second core disposed over the entire extent of the internal space of the housing.

[0022] Preferably, the porous metal body constituting the first core is a sintered metal body or a nonwoven metal fabric.

[0023] The electronic device of this invention includes the heat diffusion device of this invention.

[0024] Effects of the utility model

[0025] According to this invention, a heat diffusion device with excellent heat source temperature reduction effect can be provided. Furthermore, according to this invention, an electronic device including the aforementioned heat diffusion device can be provided. Attached Figure Description

[0026] Figure 1 This is a perspective view schematically illustrating an example of the heat diffusion device of this invention.

[0027] Figure 2 This is an exploded perspective view schematically illustrating an example of the heat diffusion device of this invention.

[0028] Figure 3 It means in Figure 2 An exploded perspective view of the heat diffusion device showing the core positioned within the internal space of the housing.

[0029] Figure 4 yes Figure 3 The heat diffusion device shown is a cross-sectional view along line IV-IV.

[0030] Figure 5A This is a cross-sectional view schematically representing an example of a first core without protrusions positioned near a heat source. Figure 5B This is a cross-sectional view schematically representing an example of a first core with a protrusion positioned near a heat source.

[0031] Figure 6A This is a perspective view schematically showing the first core of the first embodiment. Figure 6B This is a schematic cross-sectional view of the first core of the first embodiment.

[0032] Figure 7A It is a schematic representation of from and Figure 6A A perspective view of the first core of the first embodiment as observed from the opposite side. Figure 7B It is a schematic representation of from and Figure 6B A cross-sectional view of the first core of the first embodiment as seen from the opposite side.

[0033] Figure 8A This is a perspective view schematically representing the first core of the second embodiment. Figure 8B This is a schematic cross-sectional view of the first core of the second embodiment.

[0034] Figure 9A It is a schematic representation of from and Figure 8A A perspective view of the first core of the second embodiment as observed from the opposite side. Figure 9B It is a schematic representation of from and Figure 8B A cross-sectional view of the first core of the second embodiment as seen from the opposite side.

[0035] Figure 10A This is a perspective view schematically representing the first core of the third embodiment. Figure 10B This is a schematic top view of the first core of the third embodiment.

[0036] Figure 11A This is a perspective view schematically showing the cross-sectional shape of the first core in the third embodiment. Figure 11B This is a cross-sectional view schematically showing the cross-sectional shape of the first core in the third embodiment.

[0037] Figure 12A It is a schematic representation of from and Figure 11A A perspective view of the cross-sectional shape of the first core of the third embodiment as observed from the opposite side. Figure 12B It is a schematic representation of from and Figure 11B A cross-sectional view of the cross-sectional shape of the first core of the third embodiment as observed from the opposite side.

[0038] Figure 13A This is a perspective view schematically representing the first core of the fourth embodiment. Figure 13B This is a schematic top view of the first core of the fourth embodiment.

[0039] Figure 14A This is a perspective view schematically showing the cross-sectional shape of the first core in the fourth embodiment. Figure 14B This is a cross-sectional view schematically showing the cross-sectional shape of the first core in the fourth embodiment.

[0040] Figure 15A This is a perspective view schematically representing the first core of the fifth embodiment. Figure 15B This is a schematic top view of the first core of the fifth embodiment.

[0041] Figure 16A This is a perspective view schematically showing the cross-sectional shape of the first core in the fifth embodiment. Figure 16B This is a cross-sectional view schematically showing the cross-sectional shape of the first core in the fifth embodiment.

[0042] Figure 17A This is a perspective view schematically representing the first core of the sixth embodiment. Figure 17BThis is a schematic cross-sectional view of the first core of the sixth embodiment.

[0043] Figure 18A It is a schematic representation of from and Figure 17A A perspective view of the first core of the sixth embodiment as observed from the opposite side. Figure 18B It is a schematic representation of from and Figure 17B A cross-sectional view of the first core of the sixth embodiment as seen from the opposite side.

[0044] Figure 19A This is a perspective view schematically representing the first core of the seventh embodiment. Figure 19B This is a schematic cross-sectional view of the first core of the seventh embodiment.

[0045] Figure 20A It is a schematic representation of from and Figure 19A A perspective view of the first core of the seventh embodiment as observed from the opposite side. Figure 20B It is a schematic representation of from and Figure 19B A cross-sectional view of the first core of the seventh embodiment as seen from the opposite side.

[0046] Figure 21 This is an exploded perspective view schematically illustrating another example of the heat diffusion device of this utility model.

[0047] Explanation of reference numerals in the attached figures

[0048] 1, 1A, heat spreader (heat diffusion device); 10, housing; 11, first piece; 11a, first inner surface; 12, second piece; 12a, second inner surface; 20, working medium; 30, 30A, core; 31, 31a, 31A, 31B, 31C, 31D, 31E, 31F, 31G, first core; 32, second core; 40, 55, protrusion; 45, 50, concave; 60, hollow part; EP, evaporation part; HS, heat source; X, width direction; Y, length direction; Z, thickness direction. Detailed Implementation

[0049] The heat diffusion device of this utility model will be described below.

[0050] However, this invention is not limited to the following embodiments, and can be applied with appropriate modifications without changing the spirit of this invention. Furthermore, structures combining two or more preferred structures of this invention described below are also part of this invention.

[0051] As one embodiment of the heat diffusion device of this utility model, a heat spreader plate will be used as an example for the following description. The heat diffusion device of this utility model can also be applied to heat diffusion devices such as heat pipes.

[0052] The accompanying drawings are schematic diagrams and may differ from the actual product in dimensions, aspect ratio, scale, etc. The same reference numerals are used for identical or equivalent parts in the drawings. Furthermore, the same reference numerals are used for identical elements across different drawings, and redundant descriptions are omitted.

[0053] In this specification, terms indicating relationships between elements (e.g., "perpendicular," "parallel," "orthogonal," etc.) and terms indicating the shape of elements are not merely expressions with a strict meaning, but rather expressions indicating substantially equal ranges, including, for example, differences of a few percentage points. Furthermore, in this specification, "same" or "constant" are not merely expressions indicating completely identical or constant situations, but rather expressions indicating substantially identical or constant situations, including, for example, differences of a few percentage points.

[0054] Figure 1 This is a perspective view schematically illustrating an example of the heat diffusion device of this invention. Figure 2 This is an exploded perspective view schematically illustrating an example of the heat diffusion device of this invention. Figure 3 It means in Figure 2 An exploded perspective view of the heat diffusion device showing the core positioned within the internal space of the housing.

[0055] Figure 1 The vapor chamber (heat diffusion device) 1 shown includes a hollow housing 10 that is sealed in an airtight state. For example... Figure 2 As shown, the housing 10 has a first inner surface 11a and a second inner surface 12a opposite each other in the thickness direction Z. An internal space is provided in the housing 10. The heat spreader 1 also includes a working medium 20 sealed within the internal space of the housing 10 and a core 30 disposed within the internal space of the housing 10. Although not shown, the heat spreader 1 may also include a support column disposed within the internal space of the housing 10.

[0056] like Figure 1 As shown, a working medium 20 (see reference) is provided in the housing 10 for sealing. Figure 2 The evaporation portion (EP) of the evaporator. Figure 2 As shown, a heat source HS, serving as a heating element, is disposed on the outer surface of the housing 10. Examples of heat sources HS include electronic components of electronic devices, such as central processing units (CPUs). The portion of the interior space of the housing 10 located near the heat source HS and heated by it corresponds to the evaporator EP.

[0057] Preferably, the heat spreader 1 is generally planar. That is, preferably, the housing 10 is generally planar. Here, "planar" means a shape that includes plate-like and sheet-like shapes, where the dimensions in the width direction X (hereinafter referred to as width) and length direction Y (hereinafter referred to as length) are relatively large relative to the dimensions in the thickness direction Z (hereinafter referred to as thickness or height), for example, the width and length are more than 10 times the thickness, preferably more than 100 times.

[0058] The size of the heat spreader 1, i.e., the size of the housing 10, is not particularly limited. The width and length of the heat spreader 1 can be appropriately set according to the application. For example, the width and length of the heat spreader 1 can be 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, respectively. The width and length of the heat spreader 1 can be the same or different.

[0059] Preferably, the housing 10 is composed of opposing first pieces 11 and second pieces 12 joined at their outer edges.

[0060] When the housing 10 is composed of a first piece 11 and a second piece 12, the materials constituting the first piece 11 and the second piece 12 are not particularly limited, as long as they possess properties suitable for use as heat diffusion devices such as heat spreaders, such as thermal conductivity, strength, flexibility, and so on. The materials constituting the first piece 11 and the second piece 12 are preferably metals, such as copper, nickel, aluminum, magnesium, titanium, iron, or alloys with these as their main components, with copper being particularly preferred. The materials constituting the first piece 11 and the second piece 12 may be the same or different, but they are preferably the same.

[0061] When the housing 10 is composed of a first piece 11 and a second piece 12, the first piece 11 and the second piece 12 are joined together at their outer edges. The method of joining is not particularly limited, and for example, laser welding, resistance welding, diffusion bonding, brazing, TIG welding (tungsten-inactive gas welding), ultrasonic bonding, or resin sealing can be used. Laser welding, resistance welding, or brazing is preferred.

[0062] 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 even more preferably 40 μm or more and 60 μm or less. The thickness of the first sheet 11 and the second sheet 12 can be the same or different. In addition, the thickness of each sheet of the first sheet 11 and the second sheet 12 can be the same throughout or be thinner in some areas.

[0063] The shapes of the first piece 11 and the second piece 12 are not particularly limited. For example, the first piece 11 and the second piece 12 may also be shapes in which the outer edge is thicker than the parts outside the outer edge.

[0064] The overall thickness of the heat spreader 1 is not particularly limited, but it is preferably 50 μm or more and 500 μm or less. The height of the internal space of the housing 10 is not particularly limited, but it is preferably 30 μm or more and 400 μm or less.

[0065] The planar shape of the housing 10 as viewed from the thickness direction Z is not particularly limited. Examples include polygons such as triangles or rectangles, circles, ellipses, and combinations thereof. Furthermore, the planar shape of the housing 10 can also be L-shaped, C-shaped, stepped, etc. Additionally, the housing 10 may have a through-hole. The planar shape of the housing 10 can also correspond to the application of heat diffusion devices such as heat spreaders, the shape of the assembly area of ​​the heat diffusion devices, and other nearby components.

[0066] Although not shown in the figure, it is also possible that a support column is arranged inside the housing 10 to contact the first inner surface 11a. By arranging the support column inside the housing 10, the housing 10 and the core 30 can be supported.

[0067] The material constituting the support is not particularly limited, and examples include resin, metal, ceramic or mixtures thereof, and laminates thereof. Alternatively, the support can be integral with the housing 10, for example, it can be formed by etching the first inner surface 11a of the housing 10.

[0068] The shape of the support column is not particularly limited as long as it can support the shell 10 and the core 30. The shape of the cross section perpendicular to the height direction of the support column can be, for example, a rectangle, a polygon, a circle, an ellipse, etc.

[0069] The support pillars may also have a tapered shape that narrows in width from the first inner surface 11a of the housing 10 toward the core 30. This allows for a wider flow path between the support pillars on the core 30 side.

[0070] When multiple supports are arranged within the interior space of the housing 10, the heights of the supports within a vapor chamber can be either the same or different. For example, the height of the supports can be 50 μm or more and 1000 μm or less.

[0071] The arrangement of the supports is not particularly limited, but it is preferable to arrange them evenly in a predetermined area, and more preferably evenly over the entire area, for example, by arranging them with a constant center-to-center distance (pitch) between adjacent supports. By arranging the supports evenly, uniform strength can be ensured over the entire area of ​​the heat diffusion device such as the heat spreader. The center-to-center distance between the supports is, for example, 100 μm and less than 5000 μm.

[0072] The width of the support column is not particularly limited as long as it provides sufficient strength to suppress deformation of the housing 10. The diameter of the circle of the cross-section perpendicular to the height direction at the end of the support column near the core 30 is, for example, 100 μm or more and 2000 μm or less, preferably 300 μm or more and 1000 μm or less. Increasing the diameter of the support column further suppresses deformation of the housing 10. On the other hand, decreasing the diameter of the support column provides more space for the movement of vapor in the working medium 20.

[0073] The working medium 20 is not particularly limited as long as it can produce a gas-liquid phase change in the environment inside the housing 10; for example, water, alcohols, Freon substitutes, etc., can be used. For example, the working medium 20 is an aqueous compound, preferably water.

[0074] The core 30 has a capillary structure that enables the working medium 20 to move using capillary force.

[0075] Core 30 includes the first core 31.

[0076] Preferably, the first core 31 is disposed at the evaporation section EP of the housing 10 (refer to...). Figure 1 The region overlapping in the thickness direction Z. In this case, at least a portion of the first core 31 overlaps with at least a portion of the evaporation section EP of the housing 10 in the thickness direction Z. For example, either the entire first core 31 overlaps with at least a portion of the evaporation section EP of the housing 10 in the thickness direction Z, or at least a portion of the first core 31 overlaps with the entire evaporation section EP of the housing 10 in the thickness direction Z.

[0077] Preferably, the first core 31 is configured with respect to the heat source HS (refer to...). Figure 2 The region overlapping in the thickness direction Z. In this case, at least a portion of the first core 31 overlaps with at least a portion of the heat source HS in the thickness direction Z. For example, either the entire first core 31 overlaps with at least a portion of the heat source HS in the thickness direction Z, or at least a portion of the first core 31 overlaps with the entire heat source HS in the thickness direction Z.

[0078] Preferably, the core 30 also includes a sheet-like second core 32 disposed over the entire extent of the interior space of the housing 10. Alternatively, the second core 32 may also be disposed within a portion of the interior space of the housing 10.

[0079] Figure 4 yes Figure 3 The heat diffusion device shown is a cross-sectional view along line IV-IV.

[0080] exist Figure 4The overall structure is not shown, but the first core 31 is made of a porous metal material, located near the first inner surface 11a of the shell 10 (see reference). Figure 2 ) side surface (in Figure 4 The upper surface (the middle part) has multiple protrusions 40.

[0081] The material constituting the first core 31 is, for example, a metal such as copper, nickel, aluminum, magnesium, titanium, iron, or an alloy thereof, preferably copper. The material constituting the first core 31 may be the same as or different from the material constituting the housing 10.

[0082] The porous metal body constituting the first core 31 is preferably a sintered metal body or a metal nonwoven fabric. Alternatively, the porous metal body constituting the first core 31 may also be a metal mesh. On the other hand, the porous metal body constituting the first core 31 does not contain a pressed body of metal foil or metal plate. The first core 31 is preferably composed of a sintered metal body, and more preferably of a copper sintered body.

[0083] Figure 5A This is a cross-sectional view schematically representing an example of a first core without protrusions positioned near a heat source. Figure 5B This is a cross-sectional view schematically representing an example of a first core with a protrusion positioned near a heat source.

[0084] For example, Figure 5A The first core 31a and shown Figure 5B The first core 31 shown is made of a sintered metal body. Thus, if the first core 31a or the first core 31 is made of a porous metal body such as a sintered metal body, the contact area with the second inner surface 12a of the shell 10 can be set to be larger, thereby increasing the contact area with the core 30 (see reference). Figure 2 The amount of heat input.

[0085] exist Figure 5A The first core 31a and shown Figure 5B In the first core 31 shown, the heat received from the heat source HS is transferred to the working medium 20 (refer to...) Figure 2 The vapor generated by the transfer is dispersed into the vapor space inside the shell 10.

[0086] However, in Figure 5A In the first core 31a shown, if the vapor dispersion capacity of the working medium 20 emanating from the core 30 is not higher than the heat input capacity from the heat source HS to the core 30, then the amount of heat input to the core 30 will not increase.

[0087] In contrast, Figure 5B The first core 31 shown is located on the first inner surface 11a of the housing 10 (see reference). Figure 2 ) side surface (in Figure 5BThe upper surface (of which the middle part is located) has multiple protrusions 40, thus increasing the surface area for vapor dissipation of the working medium 20. Therefore, with... Figure 5A Compared to the first core 31a shown, the amount of working medium 20 evaporates increases. As a result, heat retention decreases, and in other words, thermal resistance decreases, thus improving the effect of reducing the heat source temperature.

[0088] There is no particular limitation on the method of making the first core 31. For example, the following method can be used: pressing a metal sintered body such as a copper sintered body from the front and back sides using a mold with concave and convex shapes, so that the concave and convex shapes of the mold are transferred to the surface of the metal sintered body.

[0089] Alternatively, the thickness of the first core 31 can be constant throughout the entire structure. For example, by using compression molding to manufacture the first core 31, the thickness of the first core 31 can be kept constant. If the thickness of the first core 31 is constant, the working medium 20 is uniformly distributed in the surface direction of the first core 31.

[0090] exist Figure 4 In the example shown, the first core 31 has a plurality of recesses 50 on the surface of the first core 31 on the side of the second inner surface 12a of the housing 10. As a result, a hollow portion 60 may also be formed between the surface of the first core 31 and the second inner surface 12a of the housing 10.

[0091] Figure 6A This is a perspective view schematically showing the first core of the first embodiment. Figure 6B This is a schematic cross-sectional view of the first core of the first embodiment. Figure 7A It is a schematic representation of from and Figure 6A A perspective view of the first core of the first embodiment as observed from the opposite side. Figure 7B It is a schematic representation of from and Figure 6B A cross-sectional view of the first core of the first embodiment as seen from the opposite side.

[0092] Figure 6A , Figure 6B , Figure 7A as well as Figure 7B When the first core 31A shown is disposed in the internal space of the housing 10, it has a plurality of protrusions 40 on the surface of the first inner surface 11a of the housing 10 and a plurality of recesses 50 on the surface of the second inner surface 12a of the housing 10.

[0093] Preferably, in the first core 31A, the recess 50 on the side of the second inner surface 12a is located on the opposite side of the protrusion 40 on the side of the first inner surface 11a.

[0094] Figure 8A This is a perspective view schematically representing the first core of the second embodiment. Figure 8BThis is a schematic cross-sectional view of the first core of the second embodiment. Figure 9A It is a schematic representation of from and Figure 8A A perspective view of the first core of the second embodiment as observed from the opposite side. Figure 9B It is a schematic representation of from and Figure 8B A cross-sectional view of the first core of the second embodiment as seen from the opposite side.

[0095] Figure 8A , Figure 8B , Figure 9A as well as Figure 9B When the first core 31B shown is disposed in the internal space of the housing 10, it has a plurality of recesses 45 on the surface of the first inner surface 11a of the housing 10 and a plurality of protrusions 55 on the surface of the second inner surface 12a of the housing 10.

[0096] Preferably, in the first core 31B, the protrusion 55 on the side of the second inner surface 12a is located on the opposite side of the recess 45 on the side of the first inner surface 11a.

[0097] Figure 10A This is a perspective view schematically representing the first core of the third embodiment. Figure 10B This is a schematic top view of the first core of the third embodiment. Figure 11A This is a perspective view schematically showing the cross-sectional shape of the first core in the third embodiment. Figure 11B This is a cross-sectional view schematically showing the cross-sectional shape of the first core in the third embodiment. Figure 12A It is a schematic representation of from and Figure 11A A perspective view of the cross-sectional shape of the first core of the third embodiment as observed from the opposite side. Figure 12B It is a schematic representation of from and Figure 11B A cross-sectional view of the cross-sectional shape of the first core of the third embodiment as observed from the opposite side.

[0098] Figure 10A , Figure 10B , Figure 11A , Figure 11B , Figure 12A as well as Figure 12B When the first core 31C shown is disposed in the internal space of the housing 10, it has a plurality of recesses 45 on the surface of the first inner surface 11a of the housing 10 and a plurality of protrusions 55 on the surface of the second inner surface 12a of the housing 10.

[0099] Preferably, in the first core 31C, the protrusion 55 on the side of the second inner surface 12a is located on the opposite side of the recess 45 on the side of the first inner surface 11a.

[0100] In the first core 31C, in Figure 10B When viewed from above, the planar shape of the recess 45 on the side of the first inner surface 11a is hexagonal.

[0101] Preferably, the first core 31C also has a plurality of recesses 50 on the surface of the second inner surface 12a of the housing 10.

[0102] Alternatively, the first core 31C may also have a plurality of protrusions on the surface of the first inner surface 11a of the housing 10. Preferably, the protrusions on the first inner surface 11a side are located on the opposite side of the recess 50 on the second inner surface 12a side.

[0103] In the first core 31C, the planar shape of the recess 50 on the second inner surface 12a side is hexagonal. Preferably, the area of ​​the recess 50 on the second inner surface 12a side is the same as the area of ​​the recess 45 on the first inner surface 11a side. Moreover, preferably, the depth of the recess 50 on the second inner surface 12a side is the same as the depth of the recess 45 on the first inner surface 11a side.

[0104] Figure 13A This is a perspective view schematically representing the first core of the fourth embodiment. Figure 13B This is a schematic top view of the first core of the fourth embodiment. Figure 14A This is a perspective view schematically showing the cross-sectional shape of the first core in the fourth embodiment. Figure 14B This is a cross-sectional view schematically showing the cross-sectional shape of the first core in the fourth embodiment.

[0105] Figure 13A , Figure 13B , Figure 14A as well as Figure 14B When the first core 31D shown is disposed in the internal space of the housing 10, it has a plurality of recesses 45 on the surface of the first inner surface 11a of the housing 10 and a plurality of protrusions 55 on the surface of the second inner surface 12a of the housing 10.

[0106] Preferably, in the first core 31D, the protrusion 55 on the side of the second inner surface 12a is located on the opposite side of the recess 45 on the side of the first inner surface 11a.

[0107] In the first core 31D, in Figure 13B When viewed from above, the planar shape of the recess 45 on the side of the first inner surface 11a is triangular.

[0108] Preferably, the first core 31D also has a plurality of recesses on the surface of the second inner surface 12a of the housing 10.

[0109] Alternatively, the first core 31D may also have a plurality of protrusions on the surface of the first inner surface 11a of the housing 10. Preferably, the protrusions on the first inner surface 11a side are located on the opposite side of the recesses on the second inner surface 12a side.

[0110] In the first core 31D, the planar shape of the recess on the second inner surface 12a side is triangular. Preferably, the area of ​​the recess on the second inner surface 12a side is the same as the area of ​​the recess 45 on the first inner surface 11a side. Moreover, preferably, the depth of the recess on the second inner surface 12a side is the same as the depth of the recess 45 on the first inner surface 11a side.

[0111] Figure 15A This is a perspective view schematically representing the first core of the fifth embodiment. Figure 15B This is a schematic top view of the first core of the fifth embodiment. Figure 16A This is a perspective view schematically showing the cross-sectional shape of the first core in the fifth embodiment. Figure 16B This is a cross-sectional view schematically showing the cross-sectional shape of the first core in the fifth embodiment.

[0112] Figure 15A , Figure 15B , Figure 16A as well as Figure 16B When the first core 31E shown is disposed in the internal space of the housing 10, it has a plurality of recesses 45 on the surface of the first inner surface 11a of the housing 10 and a plurality of protrusions 55 on the surface of the second inner surface 12a of the housing 10.

[0113] Preferably, in the first core 31E, the protrusion 55 on the side of the second inner surface 12a is located on the opposite side of the recess 45 on the side of the first inner surface 11a.

[0114] In the first core 31E, in Figure 15B As shown in the top view, the planar shape of the recess 45 on the side of the first inner surface 11a is quadrilateral.

[0115] Preferably, the first core 31E also has a plurality of recesses on the surface of the second inner surface 12a of the housing 10.

[0116] Alternatively, the first core 31E may also have a plurality of protrusions on the surface of the first inner surface 11a of the housing 10. Preferably, the protrusions on the first inner surface 11a side are located on the opposite side of the recesses on the second inner surface 12a side.

[0117] In the first core 31E, the planar shape of the recess on the second inner surface 12a side is quadrilateral. Preferably, the area of ​​the recess on the second inner surface 12a side is the same as the area of ​​the recess 45 on the first inner surface 11a side. Moreover, preferably, the depth of the recess on the second inner surface 12a side is the same as the depth of the recess 45 on the first inner surface 11a side.

[0118] As described above, the planar shape of the recess 45 on the first inner surface 11a side can also be a polygon such as a triangle, quadrilateral, pentagon, or hexagon. In this case, the planar shape of the recess 45 on the first inner surface 11a side can also be a regular polygon. Alternatively, the planar shape of the recess 45 on the first inner surface 11a side can also be a circle, ellipse, oblong, or the like.

[0119] Similarly, when the recess 50 exists on the side of the second inner surface 12a, the planar shape of the recess 50 on the second inner surface 12a side can also be a polygon such as a triangle, quadrilateral, pentagon, or hexagon. In this case, the planar shape of the recess 50 on the second inner surface 12a side can also be a regular polygon. Alternatively, the planar shape of the recess 50 on the second inner surface 12a side can also be a circle, ellipse, or oblong. Preferably, the planar shape of the recess 50 on the second inner surface 12a side is the same as the planar shape of the recess 45 on the first inner surface 11a side. In this case, it is preferable that the area of ​​the recess 50 on the second inner surface 12a side is the same as the area of ​​the recess 45 on the first inner surface 11a side. Moreover, it is preferable that the depth of the recess 50 on the second inner surface 12a side is the same as the depth of the recess 45 on the first inner surface 11a side.

[0120] Figure 17A This is a perspective view schematically representing the first core of the sixth embodiment. Figure 17B This is a schematic cross-sectional view of the first core of the sixth embodiment. Figure 18A It is a schematic representation of from and Figure 17A A perspective view of the first core of the sixth embodiment as observed from the opposite side. Figure 18B It is a schematic representation of from and Figure 17B A cross-sectional view of the first core of the sixth embodiment as seen from the opposite side.

[0121] Figure 17A , Figure 17B , Figure 18A as well as Figure 18B The first core 31F shown, when disposed within the interior space of the housing 10, has a plurality of protrusions 40 on the surface near the first inner surface 11a of the housing 10, which is consistent with... Figure 6A , Figure 6B , Figure 7A as well as Figure 7B The first core 31A shown is common.

[0122] On the other hand, the surface of the first core 31F on the side adjacent to the second inner surface 12a of the housing 10 is flat, which is consistent with... Figure 6A , Figure 6B , Figure 7A as well as Figure 7B The first core 31A shown is different.

[0123] Figure 19A This is a perspective view schematically representing the first core of the seventh embodiment. Figure 19B This is a schematic cross-sectional view of the first core of the seventh embodiment. Figure 20A It is a schematic representation of from and Figure 19A A perspective view of the first core of the seventh embodiment as observed from the opposite side. Figure 20B It is a schematic representation of from and Figure 19B A cross-sectional view of the first core of the seventh embodiment as seen from the opposite side.

[0124] Figure 19A , Figure 19B , Figure 20A as well as Figure 20B The first core 31G shown, when disposed within the interior space of the housing 10, has a plurality of recesses 45 on the surface near the first inner surface 11a of the housing 10, which is consistent with... Figure 10A , Figure 10B , Figure 11A , Figure 11B , Figure 12A as well as Figure 12B The first core 31C shown is common.

[0125] On the other hand, the surface of the first core 31G on the side adjacent to the second inner surface 12a of the housing 10 is flat, which is consistent with... Figure 10A , Figure 10B , Figure 11A , Figure 11B , Figure 12A as well as Figure 12B The first core 31C shown is different.

[0126] Alternatively, as with the first cores 31F and 31G, the surface on the side of the second inner surface 12a of the housing 10 can be flat. In this case, the contact area with the second inner surface 12a of the housing 10 can be increased.

[0127] Hereinafter, without distinguishing between the first core 31A to 31G, it will be referred to as the first core 31.

[0128] Preferably, the first core 31 is an integral piece having a plurality of protrusions 40 or recesses 45. For example, preferably, the first core 31 is integrally plate-shaped or sheet-shaped.

[0129] The shape, size, and height of the protrusions 40 can be the same, or partially or completely different. Similarly, the shape, size, and depth of the recesses 45 can be the same, or partially or completely different.

[0130] The arrangement of the protrusions 40 or the recesses 45 is not particularly limited. It is preferred that they are arranged equally in a predetermined area, and more preferably that they are arranged equally over the entire area, for example, in such a way that the center-to-center distance (pitch) between adjacent protrusions 40 or recesses 45 is constant.

[0131] The center-to-center distance (pitch) between adjacent protrusions 40 or recesses 45 is not particularly limited, for example, it is more than 100 μm and less than 1000 μm. If the center-to-center distance (pitch) is too large, it will be difficult to increase the surface area of ​​the first core 31. On the other hand, if the center-to-center distance (pitch) is too small, it will be difficult to process the protrusions 40 or recesses 45.

[0132] The shape, size, and height of the recesses 50 can be the same, or partially or completely different. Similarly, the shape, size, and depth of the protrusions 55 can be the same, or partially or completely different.

[0133] The arrangement of the recesses 50 or protrusions 55 is not particularly limited. It is preferred that they be arranged equally in a predetermined area, and more preferably that they are arranged equally over the entire area, for example, in such a way that the center-to-center distance (pitch) between adjacent recesses 50 or protrusions 55 is constant.

[0134] The center-to-center distance (pitch) between adjacent recesses 50 or convexities 55 is not particularly limited, for example, it is more than 100 μm and less than 1000 μm. The center-to-center distance (pitch) between adjacent recesses 50 or convexities 55 can be the same as or different from the center-to-center distance (pitch) between adjacent convexities 40 or recesses 45.

[0135] The portion of the first core 31 that contacts the second inner surface 12a of the housing 10 may or may not engage with the housing 10.

[0136] When core 30 also includes a second core 32, the size and shape of the second core 32 are not particularly limited as long as it is sheet-like. For example, it is preferable that the second core 32 is continuously arranged in the internal space of the housing 10. Preferably, the second core 32 is arranged in a manner that does not overlap with the first core 31 in the thickness direction Z.

[0137] The capillary structure of the second core 32 can also be a known structure used in conventional heat diffusion devices.

[0138] The material of the second core 32 is not particularly limited, and can be, for example, a porous metal membrane, mesh, nonwoven fabric, sintered body, or porous body formed by etching or metalworking. The mesh used as the material of the second core 32 can be, for example, a metal mesh, a resin mesh, or the aforementioned meshes with surface coatings, preferably a copper mesh, stainless steel (SUS) mesh, or polyester mesh. The sintered body used as the material of the second core 32 can also be, for example, a porous metal sintered body, a porous ceramic sintered body, etc., preferably a porous copper or nickel sintered body. The porous body used as the material of the second core 32 can also be, for example, a porous metal body, a porous ceramic body, a porous resin body, etc.

[0139] Alternatively, the second core 32 can also be a core structure made of the same material, consisting of a support portion and a perforated portion integrally formed, as described in International Publication No. 2023 / 090265.

[0140] The thickness of the second core 32 is not particularly limited; it can be the same as, greater than, or less than the thickness of the first core 31. The thickness of the second core 32 can also vary in certain areas.

[0141] The heat diffusion device of this utility model is not limited to the above-described embodiments. Various applications and modifications can be applied to the structure and manufacturing conditions of the heat diffusion device within the scope of this utility model.

[0142] Figure 21 This is an exploded perspective view schematically illustrating another example of the heat diffusion device of this utility model.

[0143] exist Figure 21 In the heat spreader (heat diffusion device) 1A shown, core 30A only includes the first core 31. Alternatively, as... Figure 21 As shown, core 30A does not include the second core 32 (refer to...). Figure 2 The first core 31 is disposed over the entire extent of the internal space of the housing 10. Alternatively, the first core 31 may be disposed over a portion of the internal space of the housing 10.

[0144] When the core 30A only includes the first core 31, the size and shape of the first core 31 are not particularly limited. For example, it is preferred that the first core 31 is continuously arranged in the internal space of the housing 10.

[0145] In the heat diffusion device of this invention, the housing can have one evaporation section or multiple evaporation sections. That is, one heat source or multiple heat sources can be disposed on the outer wall surface of the housing.

[0146] In the heat diffusion device of this invention, when the housing has multiple evaporation sections, for example, a first core may be arranged to overlap with two or more evaporation sections in the thickness direction of the housing, or a separate first core may be arranged to overlap with each evaporation section.

[0147] In the heat diffusion device of this utility model, when the housing is composed of a first piece and a second piece, the first piece and the second piece can overlap either with their ends aligned or with their ends staggered.

[0148] In the heat diffusion device of this invention, when the housing is composed of a first piece and a second piece, the materials constituting the first piece and the second piece may be different. For example, by using a material with higher strength for the first piece, the stress acting on the housing can be dispersed. Furthermore, by using different materials for the two pieces, one piece can achieve one function while the other piece achieves another. The functions described are not particularly limited, but examples include heat conduction and electromagnetic wave shielding.

[0149] The heat diffusion device of this invention can be incorporated into electronic devices for the purpose of heat dissipation. Therefore, electronic devices incorporating the heat diffusion device of this invention are also considered part of this invention. Examples of electronic devices incorporating this invention include smartphones, tablet computers, laptops, gaming devices, and wearable devices. As described above, the heat diffusion device of this invention can operate autonomously without external power, utilizing the latent heat of vaporization and latent heat of condensation of the working medium to diffuse heat in a two-dimensional manner at high speed. Therefore, electronic devices incorporating the heat diffusion device of this invention can effectively achieve heat dissipation within the limited space inside the electronic device.

[0150] The following information is disclosed in this specification.

[0151] <1>

[0152] A heat diffusion device, wherein,

[0153] The heat diffusion device includes:

[0154] A housing having a first inner surface and a second inner surface opposite each other in the thickness direction, and having an internal space;

[0155] The working medium, which is sealed within the aforementioned internal space of the housing; and

[0156] The core, which is disposed in the aforementioned internal space of the aforementioned housing,

[0157] The aforementioned core includes the first core.

[0158] The first core is made of a porous metal material and has a plurality of protrusions or recesses on the surface of the first inner surface of the shell.

[0159] <2>

[0160] According to the heat diffusion device described in <1>, wherein,

[0161] A hollow portion is formed between the surface of the first core and the second inner surface of the housing.

[0162] <3>

[0163] According to the heat diffusion device described in <2>, wherein,

[0164] The first core has a plurality of recesses or protrusions on the surface of the first core on the side of the second inner surface of the housing.

[0165] <4>

[0166] According to the heat diffusion device described in <3>, wherein...

[0167] The recess on the second inner surface is located on the opposite side of the protrusion on the first inner surface.

[0168] The protrusion on the second inner surface is located on the opposite side of the concave portion on the first inner surface.

[0169] <5>

[0170] The heat diffusion device according to any one of <2> to <4>, wherein,

[0171] The thickness of the first core mentioned above is constant.

[0172] <6>

[0173] According to the heat diffusion device described in <1>, wherein,

[0174] The surface of the first core that is adjacent to the second inner surface of the housing is flat.

[0175] <7>

[0176] The heat diffusion device according to any one of <1> to <6>, wherein,

[0177] The first core is disposed in the region that overlaps with the evaporation section of the housing in the thickness direction.

[0178] <8>

[0179] According to the heat diffusion device described in <7>, wherein...

[0180] The aforementioned core also includes a sheet-like second core disposed over the entire extent of the aforementioned internal space of the aforementioned housing.

[0181] <9>

[0182] The heat diffusion device according to any one of <1> to <8>, wherein,

[0183] The aforementioned porous metal body constituting the first core is a sintered metal body or a nonwoven metal fabric.

[0184] <10>

[0185] An electronic device, wherein,

[0186] The electronic device includes any one of <1> to <9>.

[0187] Industrial availability

[0188] This heat dissipation device can be widely used in portable information terminals and other fields. For example, it can be used to extend the life of electronic devices by reducing the temperature of heat sources such as CPUs, and can be used in smartphones, tablet computers, laptops, etc.

Claims

1. A heat diffusion device, characterized in that, The heat diffusion device includes: A housing having a first inner surface and a second inner surface opposite each other in the thickness direction, and having an internal space; A working medium, which is sealed within the internal space of the housing; and The core, which is disposed in the internal space of the housing, The core includes a first core. The first core is made of a porous metal material and has multiple protrusions or recesses on the surface of the first inner surface of the housing.

2. The heat diffusion device according to claim 1, characterized in that, A hollow portion is formed between the surface of the first core and the second inner surface of the housing.

3. The heat diffusion device according to claim 2, characterized in that, The first core has a plurality of recesses or protrusions on the surface of the first core on the side of the second inner surface of the housing.

4. The heat diffusion device according to claim 3, characterized in that, The recess on the second inner surface side is located on the opposite side of the convex portion on the first inner surface side. The protrusion on the second inner surface side is located on the opposite side of the concave portion on the first inner surface side.

5. The heat diffusion device according to claim 2, characterized in that, The thickness of the first core is constant.

6. The heat diffusion device according to claim 1, characterized in that, The surface of the first core on the side adjacent to the second inner surface of the housing is flat.

7. The heat diffusion device according to any one of claims 1 to 6, characterized in that, The first core is disposed in the region that overlaps with the evaporation portion of the housing in the thickness direction.

8. The heat diffusion device according to claim 7, characterized in that, The core also includes a sheet-like second core configured throughout the entire extent of the interior space of the housing.

9. The heat diffusion device according to any one of claims 1 to 6, characterized in that, The porous metal body constituting the first core is a sintered metal body or a nonwoven metal fabric.

10. An electronic device, characterized in that, The electronic device includes the heat diffusion device according to any one of claims 1 to 6.

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