TW202403256A - Heat diffusion device and electronic appliance - Google Patents

Abstract

A vapor chamber 1 as an embodiment of this heat diffusion device comprises: a housing 10 having a first inner surface 11a and a second inner surface 12a, which face each other in the thickness direction Z; a working fluid 20 enclosed in the inner space of the housing 10; and a wick 30 disposed in the inner space of the housing 10, the wick 30 including a support 31 which is in contact with the first inner surface 11a and a perforated object 32 which is in contact with the support 31, the edges of the wick 30 being bent so as to approach the first inner surface 11a.

Description

Thermal diffusion devices and electronic equipment

The present invention relates to a thermal diffusion device and electronic equipment.

In recent years, the amount of heat generated has increased due to the high integration and high performance of components. In addition, as the heat density increases due to the miniaturization of products, heat dissipation measures become important. This situation is particularly significant in the area of mobile terminals such as smartphones and tablets. As heat countermeasure members, graphite sheets and the like are often used. However, since the heat transfer capacity is insufficient, the use of various heat countermeasure members has been examined. Among them, the industry has promoted the use of vapor chambers in the form of planar heat pipes to diffuse heat very effectively.

The vapor chamber has a structure in which a working medium (also called a working fluid) is sealed inside the casing and a core is used to transport the working medium through capillary force. After the working medium absorbs heat from the heating element and evaporates in the vapor chamber in the evaporation section that absorbs heat from the heating element such as electronic parts, it moves in the vapor chamber and is cooled and returns to the liquid phase. The working medium that returns to the liquid phase moves to the evaporation part on the side of the heating element again by the capillary force of the core, cooling the heating element. By repeating this, the vapor chamber can work independently without external power, using the latent heat of evaporation and condensation of the working medium to diffuse heat in two dimensions at a high speed.

Patent Document 1 describes a vapor chamber that includes a casing that includes an upper casing sheet and a lower casing sheet that are joined at the outer edge and have an internal space; and a working fluid that is enclosed in the above-mentioned casing. Internal space; micro-channels, which are arranged in the internal space of the above-mentioned lower shell sheet and constitute the flow path of the above-mentioned working fluid; and a sheet-shaped core, which is arranged in the above-mentioned internal space of the above-mentioned shell and are connected with the above-mentioned micro channels arranged in contact; and the contact area between the core and the microchannel is 5% to 40% relative to the area of the internal space when viewed from above. [Prior technical documents] [Patent documents]

[Patent Document 1] International Publication No. 2021/229961

[Problem to be solved by the invention]

In the vapor chamber described in Patent Document 1, the working fluid changes from liquid to gas in the hole of the core by heat from a heat source closely connected to the lower case sheet. That is, the working fluid forms a gas-liquid interface in the pores of the core. The vaporized working fluid releases heat and returns to liquid in the internal space of the housing. The working fluid that recovers the liquid moves in the microchannel through the capillary force formed by the holes in the core, and is again transported to the vicinity of the heat source. However, there is room for improvement in terms of enlarging the vapor space in the internal space of the casing for the working fluid that is vaporized to become vapor to move.

In addition, the above-mentioned problems are not limited to the vapor chamber, but are common to thermal diffusion devices that can diffuse heat by having the same structure as the vapor chamber.

The present invention was completed in order to solve the above-mentioned problems, and its object is to provide a heat diffusion device that can expand the vapor space. Furthermore, an object of the present invention is to provide an electronic device provided with the above-mentioned thermal diffusion device. [Technical means to solve problems]

The thermal diffusion device of the present invention includes: a casing having a first inner surface and a second inner surface facing each other in the thickness direction; a working medium sealed in the internal space of the casing; and a core disposed in the casing. The above-mentioned internal space of the body; and the above-mentioned core includes: a support body connected with the above-mentioned first inner surface, and a porous body connected with the above-mentioned support body; the edge end of the above-mentioned core is close to the above-mentioned first inner surface side Way to bend.

The electronic device of the present invention includes the thermal diffusion device of the present invention. [The effect of the invention]

According to the present invention, a heat diffusion device capable of expanding the vapor space can be provided. Furthermore, according to the present invention, an electronic device including the above-mentioned thermal diffusion device can be provided.

Hereinafter, the thermal diffusion device of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be appropriately modified and applied within the scope that does not change the gist of the present invention. In addition, the present invention also includes a combination of two or more of each preferred configuration of the present invention described below.

Hereinafter, as an embodiment of the thermal diffusion device of the present invention, a vapor chamber will be described as an example. The thermal diffusion device of the present invention can also be applied to thermal diffusion devices such as heat pipes.

The drawings shown below are schematic drawings, and their dimensions, aspect ratios, etc. may differ from the actual product.

FIG. 1 is a perspective view schematically showing an example of the heat diffusion device of the present invention. FIG. 2 is an example of a cross-sectional view taken along line II-II of the heat diffusion device shown in FIG. 1 .

The vapor chamber (thermal diffusion device) 1 shown in FIGS. 1 and 2 includes a hollow casing 10 sealed in an airtight state. The housing 10 has a first inner surface 11a and a second inner surface 12a facing each other in the thickness direction Z. The vapor chamber 1 further includes: a working medium 20 sealed in the internal space of the casing 10 ; and a core 30 arranged in the internal space of the casing 10 .

The casing 10 is provided with an evaporation part for evaporating the enclosed working medium 20 . As shown in FIG. 1 , a heating element (heat source) HS is arranged on the outer surface of the housing 10 . Examples of the heat source HS include electronic components of electronic equipment, such as a central processing unit (CPU). The portion in the inner space of the casing 10 near the heat source HS and heated by the heat source HS corresponds to the evaporation portion.

The steam chamber 1 is preferably planar as a whole. That is, the housing 10 is preferably planar as a whole. Here, "planar shape" includes plate shape and sheet shape, and means that the dimension in the width direction A shape with a considerable thickness or height, such as a shape with a width and length that are more than 10 times the thickness, preferably more than 100 times.

The size of the steam chamber 1, that is, the size of the housing 10 is not particularly limited. The width and length of the steam chamber 1 can be appropriately set according to the purpose. The width and length of the vapor chamber 1 are, for example, 5 mm to 500 mm, 20 mm to 300 mm, or 50 mm to 200 mm. The width and length of the steam chamber 1 can be the same or different.

The housing 10 is preferably composed of a first sheet 11 and a second sheet 12 facing each other in the thickness direction Z and having their outer edges joined. The first sheet 11 has the first inner surface 11 a of the housing 10 . The second sheet 12 has the second inner surface 12a of the housing 10. The respective outer edge portions of the first sheet 11 and the second sheet 12 are joined by the joining portion 13 .

In the case where the housing 10 is composed of the first sheet 11 and the second sheet 12, the materials constituting the first sheet 11 and the second sheet 12 only need to have properties suitable for use as a vapor chamber, such as thermal conductivity. , strength, softness, flexibility, etc. are not particularly limited. The material constituting the first sheet 11 and the second sheet 12 is preferably metal, and may be, for example, copper, nickel, aluminum, magnesium, titanium, iron, or alloys mainly composed of these, and is particularly preferably copper. The materials constituting the first sheet 11 and the second sheet 12 may be the same or different, but are preferably the same.

When the housing 10 is composed of the first sheet 11 and the second sheet 12 , the outer edge portions of the first sheet 11 and the second sheet 12 are joined by the joint portion 13 . The above-mentioned joining method is not particularly limited. For example, laser welding, resistance welding, diffusion joining, sinter welding, TIG welding (tungsten-inert gas welding), ultrasonic joining or resin sealing can be used. Preferably, laser welding can be used. , resistance welding or welding.

The thickness of the first sheet 11 and the second sheet 12 is not particularly limited, but each is preferably from 10 μm to 200 μm, more preferably from 30 μm to 100 μm, and most preferably from 40 μm to 60 μm. The thickness of the first sheet 11 and the second sheet 12 may be the same or different. In addition, the thickness of each of the first sheet 11 and the second sheet 12 may be the same throughout, or may be partially thinner.

The shapes of the first sheet 11 and the second sheet 12 are not particularly limited. For example, each of the first sheet 11 and the second sheet 12 may have a shape in which the outer edge portion is thicker than the portion other than the outer edge portion.

In the joint part 13, the first sheet 11 and the second sheet 12 are joined. The joining portion 13 may have traces of joining the first sheet 11 and the second sheet 12 .

The overall thickness of the vapor chamber 1 is not particularly limited, but is preferably 50 μm or more and 500 μm or less.

The planar shape of the housing 10 when viewed from the thickness direction Z is not particularly limited, and examples thereof include polygonal shapes such as triangles and rectangles, circles, ellipses, and combinations thereof. In addition, the planar shape of the housing 10 may be L-shaped, C-shaped (U-shaped), stepped, etc. In addition, the housing 10 may have a through-hole. The planar shape of the housing 10 can be a shape corresponding to the purpose of the steam chamber, the shape of the place where the steam chamber is incorporated, and other nearby components.

The working medium 20 is not particularly limited as long as the gas-liquid phase change may occur under the environment in the casing 10 . For example, water, alcohol, alternative Freon, etc. may be used. For example, the working medium is an aqueous compound, preferably water.

The core 30 has a capillary structure that can move the working medium 20 by capillary force. The capillary structure of the core 30 may be a well-known structure used in previous vapor chambers.

The size and shape of the core 30 are not particularly limited. For example, it is preferable that the core 30 is continuously arranged in the internal space of the housing 10 . The core 30 can be disposed in the entire internal space of the casing 10 when viewed from the thickness direction Z, or it can be disposed in a part of the internal space of the casing 10 when viewed from the thickness direction Z. Examples of the arrangement of cores in the internal space of the housing 10 will be described later using FIGS. 23 , 24 and 25 .

As shown in FIG. 2 , the core 30 includes a support 31 in contact with the first inner surface 11 a and a porous body 32 in contact with the support 31 .

Figure 3 is an enlarged view of part III of Figure 2. FIG. 3 is an enlarged view showing the periphery of the edge of the core 30 .

FIG. 4 is an enlarged view showing a modified example of part III of FIG. 2 .

The edge end of the core 30 is bent toward the first inner surface 11a side. The edge of the core 30 is bent toward the lower side in FIGS. 3 and 4 . In the core 30 shown in FIGS. 3 and 4 , the edge end of the perforated body 32 is bent toward the first inner surface 11 a side.

If the edge end of the core 30 is bent so as to approach the first inner surface 11a side, compared to a core with an unbent edge end, the space on the second inner surface 12a side can be expanded further than the edge end of the core 30, so it can The space in which the working medium 20 that expands the gas supply and becomes vapor moves is the vapor space. Specifically, in the core 30 , compared with a core in which the edge is not bent so as to approach the first inner surface 11 a side, the area indicated by R in FIGS. 3 and 4 can be expanded as the vapor space. If the vapor space is enlarged, the thermal conductivity of the vapor chamber 1 can be increased.

The edge end of the core 30 can be bent so as to approach the first inner surface 11a side by performing a punching process, for example. In the case where the core 30 is made of a porous sintered body such as a ceramic porous sintered body, a paste-like material can be printed, punched and then fired, whereby the edge of the core 30 can be directed toward the first inner surface. It is curved so that the surface 11a side approaches. Alternatively, the porous sintered body may be made thick in advance, and a part of the porous sintered body may be removed by etching or the like, thereby bending the edge of the core 30 toward the first inner surface 11a side.

The shape of the edge of the core 30 is not particularly limited as long as it is curved so as to approach the first inner surface 11a side.

In the example shown in FIGS. 3 and 4 , the edge of the core 30 is curved in a cross-section along the thickness direction Z so as to approach the first inner surface 11 a side. In this case, it is preferable that the edge end of the core 30 has a shape convex toward the second inner surface 12a side (upper side) as shown in FIGS. 3 and 4 . When the edge of the core 30 is curved in the cross section along the thickness direction Z, it may be bent in a constant curvature, or it may be bent while the curvature changes. In addition, the edge end of the core 30 can be linearly bent at a predetermined position in a cross section along the thickness direction Z so as to approach the first inner surface 11a side.

As shown in FIG. 3 , in the cross section along the thickness direction Z, it is preferable that there is a gap between the edge end of the core 30 and the inner edge of the housing 10 in the direction perpendicular to the thickness direction Z. That is, in the cross section along the thickness direction Z, it is preferable that the edge end of the core 30 does not contact the inner edge of the housing 10 . Hereinafter, the effect produced by having a gap in the direction perpendicular to the thickness direction Z between the edge end of the core 30 and the inner edge of the housing 10 in the cross section along the thickness direction Z will be described.

In the vapor chamber 1, in the portion of the vapor space near the inner edge of the casing 10, the working medium 20 that becomes vapor easily becomes liquid by being in contact with the inner edge of the casing 10. Therefore, in the case where the edge of the core 30 is in contact with the inner edge of the casing 10 in the cross section along the thickness direction Z, the liquid working medium 20 is accumulated between the edge of the core 30 and the casing 10 There is a risk that the vapor space will become narrower near the portion where the inner edges are connected. In view of this, if in the cross section along the thickness direction Z, there is a gap between the edge end of the core 30 and the inner edge of the housing 10 in the direction perpendicular to the thickness direction Z, then the liquid working medium 20 can pass through the core The gap between the edge of 30 and the inner edge of the housing 10 is moved to the liquid flow path, thereby preventing the vapor space from being narrowed due to the accumulation of the liquid working medium 20 in the vapor space.

The distance between the edge of the core 30 and the inner edge of the housing 10 (the length indicated by A in FIG. 3 ) is preferably, for example, 10 μm or more. If the distance between the edge of the core 30 and the inner edge of the casing 10 (the length indicated by A in Figure 3) is 10 μm or more, it can further effectively prevent the liquid working medium 20 from accumulating in the vapor space and causing the vapor space to collapse. Narrow. On the other hand, the distance between the edge of the core 30 and the inner edge of the housing 10 (the length indicated by A in FIG. 3 ) is preferably 500 μm or less.

As shown in FIG. 4 , in the cross section along the thickness direction Z, there may be no gap between the edge end of the core 30 and the inner edge of the housing 10 in the direction perpendicular to the thickness direction Z. In FIG. 4 , the edge end of the core 30 is connected to the inner edge of the housing 10 . In addition, when the edge end of the core 30 is in contact with the inner edge of the housing 10 as shown in FIG. 4 , the distance between the edge end of the core 30 and the inner edge of the housing 10 is 0 μm.

The distance in the thickness direction Z between the edge end of the core 30 and the portion constituting the core 30 other than the edge end, that is, the bending height of the edge end of the core 30 (the distance represented by B in FIG. 3 ) is not particularly limited, and may be, for example, 1 μm. Above, below 100 μm.

The length of the portion of the edge of the core 30 in the cross section along the thickness direction Z that is bent toward the second inner surface 12a side in the direction perpendicular to the thickness direction Z is the bending width of the edge of the core 30 (The length represented by C in FIG. 3) is not particularly limited, and may be, for example, 1 μm or more and 1000 μm or less. In FIG. 3 , the bending width of the edge end of the core 30 is the length in the width direction X.

Only a part of the edge of the core 30 may be bent toward the first inner surface 11a side. However, from the viewpoint of expanding the vapor space, it is preferable that the entire edge of the core 30 be bent toward the first inner surface 11a side. way to bend.

The joint portion 13 of the first sheet 11 and the second sheet 12 is preferably located at a position different from the edge end of the core 30 in the thickness direction Z. If the joint 13 of the first sheet 11 and the second sheet 12 is located at the same position as the edge of the core 30 in the thickness direction Z, then during the manufacturing process of the steam chamber, the first sheet 11 and the second sheet 12 are When the 2 sheets 12 are joined, the core 30 enters the joint portion 13 and the portion that functions as the core 30 is reduced, so the maximum heat transfer amount may be reduced. In this regard, if the joint portion 13 of the first sheet 11 and the second sheet 12 is located at a different position from the edge end of the core 30 in the thickness direction Z, the edge end of the core 30 can be prevented from entering the joint portion 13. Therefore, It can prevent the maximum heat transfer capacity in the steam chamber 1 from being reduced.

In Figures 3 and 4, the joint 13 of the first sheet 11 and the second sheet 12 is located between the edge end of the core 30 and the second inner surface 12a of the housing 10 in the thickness direction Z, but the core 30 The edge end may be located between the joint portion 13 of the first sheet 11 and the second sheet 12 and the second inner surface 12a of the housing 10 in the thickness direction Z.

FIG. 5 is a partially enlarged cross-sectional view schematically showing an example of the core constituting the heat diffusion device shown in FIG. 2 . Fig. 6 is a top view of the core shown in Fig. 5 viewed from the support side.

In the core 30, a part of the metal foil is bent and recessed by, for example, punching processing, and the support 31 is formed in the recessed part. Since the vapor space is formed in the recessed portion of the support 31, the thermal conductivity is improved. Not limited to the example shown in FIG. 5 , when punching metal foil, depending on the conditions of the punching process, a through hole may be formed in the recessed portion when bending a part of the metal foil.

The thickness of the metal foil before punching processing etc. is preferably kept constant. However, the metal foil sometimes becomes thinner in the curved portion. Based on the above facts, in the core 30 , it is preferable that the thickness of the support body 31 is the same as the thickness of the porous body 32 , or is smaller than the thickness of the porous body 32 .

In the core 30 , the porous body 32 is made of the same material as the support 31 .

In the core 30, the support body 31 and the porous body 32 are integrally formed. In this specification, "the support 31 and the porous body 32 are integrally formed" means that there is no interface between the support 31 and the porous body 32. Specifically, it means that there is no interface between the support 31 and the porous body. There is no boundary between 32 and 32.

In the core 30 , the support 31 includes a plurality of columnar members as shown in FIG. 8 , for example. By maintaining the liquid phase working medium 20 between the columnar members, the heat transfer performance of the vapor chamber 1 can be improved. Here, "columnar" means a shape in which the ratio of the length of the long side of the base is less than 5 times the length of the short side of the base.

The shape of the columnar member is not particularly limited, and examples include a cylindrical shape, a rectangular prism shape, a truncated cone shape, a truncated cone shape, and the like.

The shape of the support 31 is not particularly limited, but it is preferably a tapered shape in which the width of the support 31 becomes narrower from the porous body 32 toward the first inner surface 11 a as shown in FIGS. 2 and 5 . This prevents the porous body 32 from falling between the supports 31 and expands the flow path between the supports 31 on the housing 10 side. As a result, the transmittance increases and the maximum heat transfer amount becomes larger.

The arrangement of the supports 31 is not particularly limited, but it is preferably arranged evenly in a predetermined area, more preferably evenly throughout the whole, for example, the distance (pitch) between the centers of the supports 31 is constant.

The distance between the centers of the supports 31 (length represented by P ₃₁ in FIG. 6 ) is, for example, 60 μm or more and 800 μm or less. The width of the support 31 (length represented by W ₃₁ in FIG. 6 ) is, for example, 20 μm or more and 500 μm or less. The height of the support 31 (length represented by T ₃₁ in FIG. 5 ) is, for example, 10 μm or more and 100 μm or less. The circular equivalent diameter of the cross section perpendicular to the height direction of the support 31 is, for example, 20 μm or more and 500 μm or less.

In the example shown in FIG. 5 , the bending height of the edge end of the core 30 (the distance represented by B in FIG. 5 ) is smaller than the height of the support 31 (the length represented by T ₃₁ in FIG. 5 ).

The bending width at the edge of the core 30 (the distance represented by C in Figures 5 and 6) can be smaller or larger than the width of the support 31 (the length represented by _W31 in Figure 6). It can also be the same.

In the core 30 , the porous body 32 may have a through hole 33 penetrating along the thickness direction Z. In the through hole 33, the working medium 20 can move by capillary phenomenon. The through-hole 33 is preferably provided in a non-existent portion of the support 31 when viewed from the thickness direction Z. The shape of the through hole 33 is not particularly limited, but the cross section in the plane perpendicular to the thickness direction Z is preferably circular or elliptical.

The arrangement of the through-holes 33 of the perforated body 32 is not particularly limited. It is preferably arranged evenly in a predetermined area, and more preferably it is evenly arranged throughout the entire body. For example, the distance between the centers of the through-holes 33 of the perforated body 32 is (Pitch) is configured in a certain way.

The distance between the centers of the through holes 33 of the porous body 32 (length represented by P ₃₃ in FIG. 6 ) is, for example, 3 μm or more and 150 μm or less. The diameter of the through hole 33 (length represented by ϕ ₃₃ in FIG. 6 ) is, for example, 100 μm or less. The thickness of the porous body 32 (length represented by T ₃₂ in FIG. 5 ) is, for example, 5 μm or more and 50 μm or less.

The bending height of the edge of the core 30 (the distance represented by B in Figure 5) can be smaller than the thickness of the porous body 32 (the length represented by _T32 in Figure 5), can also be greater, or can be compared with the thickness of the porous body 32. same.

The bending width of the edge of the core 30 (the distance represented by C in Figures 5 and 6) can be smaller than the diameter of the through hole 33 (the length represented by _ϕ33 in Figure 6), or can be larger, or it can be larger. Can be the same as it.

The through hole 33 can be produced, for example, by punching metal or the like constituting the porous body 32 by punching. The core 30 can be formed by collectively performing punching processing to form the support 31 and punching processing to form the through-hole 33 .

As shown in FIG. 2 , the vapor chamber 1 may further include a support column 40 disposed in the internal space so as to be in contact with the second inner surface 12 a of the housing 10 . By arranging the pillars 40 in the internal space of the housing 10, the housing 10 and the core 30 can be supported.

The material constituting the support 40 is not particularly limited, and examples thereof include resin, metal, ceramics, mixtures and laminates thereof, and the like. In addition, the pillar 40 may be integrated with the housing 10, and may be formed by etching the second inner surface 12a of the housing 10, for example.

The shape of the support 40 is not particularly limited as long as it can support the housing 10 and the core 30 . Examples of the shape of the cross section of the support 40 perpendicular to the height direction include polygons such as rectangles, circles, and ellipses.

The heights of the pillars 40 in a steam chamber can be the same or different.

The height of the pillar 40 may be, for example, 50 μm or more and 1000 μm or less.

The height of the pillar 40 is preferably greater than the height of the support body 31 .

In the cross section shown in FIG. 2 , the width of the pillar 40 is not particularly limited as long as it provides strength that can suppress the deformation of the housing 10 . The circular equivalent diameter of the cross section perpendicular to the height direction of the end of the pillar 40 is, for example, 100 μm or more and 2000 μm or less, preferably 300 μm or more and 1000 μm or less. By increasing the circle equivalent diameter of the pillar 40, the deformation of the housing 10 can be further suppressed. On the other hand, by reducing the circle equivalent diameter of the support 40, a wider space for the vapor of the working medium 20 to move can be ensured.

The circular equivalent diameter of the cross section perpendicular to the height direction of the support 40 is preferably larger than the circular equivalent diameter of the support body 31 of the cross section perpendicular to the height direction.

The arrangement of the pillars 40 is not particularly limited, but it is preferably arranged evenly in a specific area, more preferably evenly throughout the whole, for example, the distance between the pillars 40 is constant. By arranging the pillars 40 evenly, uniform strength can be ensured throughout the entire vapor chamber 1 .

The distance between the centers of adjacent pillars 40 may be, for example, 100 μm or more and 5000 μm or less.

The distance between the centers of adjacent pillars 40 is preferably larger than the distance between the centers of adjacent supports 31 . In the case where the support body 31 includes a plurality of columnar members, the distance between the centers of adjacent pillars 40 is preferably larger than the distance between the centers of adjacent columnar members.

FIG. 7 is a partially enlarged cross-sectional view of the first variation of the schematic display core.

In addition, in the cross-sectional views shown in FIGS. 7 to 9 , in order to simplify the explanation of variations of the core, the edge end of the core is not shown. The shape of the edge end of the core in the cross-sectional view shown in FIGS. 7 to 9 may be the same as the shape of the edge end of the core 30 in the cross-sectional view shown in FIG. 5 .

In the core 30A shown in Figure 7, the support 31 is not recessed.

In the core 30A shown in FIG. 7 , the porous body 32 is made of the same material as the support 31 . When the porous body 32 is made of the same material as the support 31, the material constituting the support 31 and the porous body 32 is not particularly limited, and examples thereof include resin, metal, ceramics, or mixtures and laminates thereof. wait. The material constituting the support body 31 and the porous body 32 is preferably metal.

In the core 30A, the support body 31 and the porous body 32 can be integrally formed.

The core 30A in which the support 31 and the porous body 32 are integrated can be produced by, for example, etching technology, printing technology using multi-layer coating, or other multi-layer technology.

In the core 30A, when the porous body 32 is made of the same material as the support 31, the support 31 and the porous body 32 do not need to be integrally formed. For example, since the copper pillars as the support 31 and the copper mesh as the porous body 32 are fixed in the core 30A by diffusion bonding or point welding, it is difficult to fully join the support 31 and the porous body 32 . , so a gap is generated in a part between the support body 31 and the porous body 32 . In such a core 30A, since a boundary can be distinguished between the support body 31 and the porous body 32, the porous body 32 is made of the same material as the support body 31, but the support body 31 and the porous body 32 are different. Constructed in one piece.

FIG. 8 is a partially enlarged cross-sectional view of a second modification example of the schematic display core.

In the core 30B shown in Figure 8, the support 31 is not recessed.

In the core 30B shown in FIG. 8 , the support 31 and the porous body 32 are made of porous bodies. Since not only the porous body 32 but also the supporting body 31 is made of a porous body, the capillary force of the core 30B can be improved.

Examples of the porous body constituting the support 31 and the porous body 32 include porous sintered bodies such as metal porous sintered bodies and ceramic porous sintered bodies, or porous bodies such as metal porous bodies, ceramic porous bodies, and resin porous bodies. .

The core 30B made of a porous body can be produced by, for example, a printing technique using multi-layer coating using a metal paste or a ceramic paste. At this time, the content of the metal or ceramic in the paste used to form the support 31 may be the same as the content of the metal or ceramic in the paste used to form the porous body 32, or may be greater than that used to form the porous body 32. The content of metal or ceramic in the paste for the body 32 may be less, or may be greater than the content of metal or ceramic in the paste used to form the porous body 32 . For example, the content of the metal or ceramic in the paste used to form the support 31 is greater than the content of metal or ceramic in the paste used to form the porous body 32, so that the support 31 can be made more durable. The density is greater than that of the porous body 32 . As a result, the strength of the support 31 can be improved.

The porous body 32 made of a porous body may have a through hole 33 penetrating along the thickness direction Z. The porous body 32 made of a porous body does not need to have the through-hole 33 penetrating along the thickness direction Z.

FIG. 9 is a partially enlarged cross-sectional view of a third modification example of the schematic display core.

In the core 30C shown in Figure 9, the support 31 is not recessed.

In the core 30C shown in FIG. 9 , the porous body 32 is made of a different material from the support 31 .

When the support 31 and the porous body 32 are made of different materials, the material constituting the support 31 is not particularly limited, and examples thereof include resin, metal, ceramics, mixtures, and laminates thereof. The material constituting the porous body 32 is not particularly limited, and examples thereof include resin, metal, ceramics, mixtures and laminates thereof, and the like.

The core 30C in which the support 31 and the porous body 32 are made of different materials can be produced by, for example, printing technology using multi-layer coating using metal paste or ceramic paste.

When the porous body 32 is made of a different material from the support body 31 , the support body 31 and the porous body 32 can be fixed by diffusion bonding or point welding.

In the core 30C, the porous body 32 is composed of a porous body, for example.

Examples of the porous body constituting the porous body 32 include porous sintered bodies such as metal porous sintered bodies and ceramic porous sintered bodies, or porous bodies such as metal porous bodies, ceramic porous bodies, and resin porous bodies.

The porous body 32 made of a porous body may have through-holes 33 penetrating along the thickness direction Z. The porous body 32 made of a porous body does not need to have the through-hole 33 penetrating along the thickness direction Z.

FIG. 10A is a partially enlarged cross-sectional view of a fourth modification example of the schematic display core. FIG. 10B is a plan view schematically showing the flow of vapor in the through holes, the convex portions, and the vicinity of the convex portions when the core shown in FIG. 10A is viewed from the porous body side.

In the core 30D shown in FIG. 10A , a convex portion 34 is provided on the periphery of the through hole 33 in a direction approaching the second inner surface 12 a.

The convex portion 34 has a first end portion 35 on the first inner surface 11a side and a second end portion 36 on the second inner surface 12a side.

Hereinafter, the effect produced by providing the convex portion 34 in the direction close to the second inner surface 12a on the periphery of the through hole 33 will be described. The working medium 20 evaporated in the heat source HS flows in a vapor state in the space between the porous body 32 and the second inner surface 12a in a direction away from the heat source HS. As shown in FIG. 10B , if a protrusion 34 is provided on the periphery of the through hole 33 in a direction approaching the second inner surface 12 a , the vapor flowing in the space between the perforated body 32 and the second inner surface 12 a will be It flows in a roundabout manner at the outer periphery of the convex portion 34 . Therefore, the flow of steam can be prevented from directly contacting the liquid surface of the working medium 20 in the through hole 33 . Therefore, the capillary force of the core 30 can reduce the influence of the flow of vapor in the opposite direction, the so-called countercurrent. Therefore, the maximum heat transfer capacity of the steam chamber 1 can be increased.

The convex portion 34 is preferably provided on the entire peripheral edge of the through hole 33 . The protrusion 34 may be provided only on a part of the periphery of the through hole 33 .

The protrusions 34 may be provided at the periphery of all the through holes 33 in the porous body 32 , or may be provided at only the periphery of a part of the through holes 33 in the porous body 32 . When the convex portion 34 is provided only on the periphery of a part of the through-hole 33 in the perforated body 32, it is preferable to provide the convex portion 34 on the periphery other than the through-hole 33 located directly above the heat source HS.

The through hole 33 and the convex portion 34 can be produced by, for example, punching the metal constituting the perforated body 32 by punching. In punching by punching processing, the shape of the convex portion, etc. can be adjusted by appropriately adjusting the depth of punching. In addition, the depth of punching means, for example, how far the punching tool is pressed along the punching direction when punching is performed by a punching tool.

The size of the convex portion 34 is not particularly limited. For example, the height of the protrusion 34 can be larger than the diameter of the through hole 33 , the height of the protrusion 34 can also be smaller than the diameter of the through hole 33 , and the height of the protrusion 34 can also be the same as the diameter of the through hole 33 . In addition, in the convex portion 34 shown in FIG. 10A , the height of the convex portion 34 means the distance in the thickness direction Z between the first end portion 35 and the second end portion 36 .

In the example shown in FIG. 10A , the bending height of the edge end of the core 30D (the distance indicated by B in FIG. 10A ) is larger than the height of the convex portion 34 . The bending height of the edge of the core 30D (the distance indicated by B in FIG. 10A ) may be smaller than the height of the convex part 34 , or may be the same as the height of the convex part 34 .

In addition, when the protrusion 34 is provided on the periphery of the through hole 33 in the direction approaching the second inner surface 12a, the thickness of the perforated body 32 means the thickness of the perforated body 32 in the portion where the protrusion 34 is not provided. thickness.

In the core 30D shown in FIG. 10A , a part of the metal foil is bent and recessed by punching processing or the like, and a support 31 is formed in the recessed part. The core 30D can be formed by collectively performing punching processing to form the support 31 and punching processing to form the through holes 33 and the convex portions 34 .

The core 30D shown in FIG. 10A can be like the core 30A shown in FIG. 7 , the core 30B shown in FIG. 8 , and the core 30C shown in FIG. 9 , and the supporting body 31 is not recessed.

FIG. 11 is a partially enlarged cross-sectional view schematically showing a first modification example of the convex portion shown in FIG. 10A .

In addition, in the cross-sectional views shown in FIGS. 11 to 15 , in order to simplify the explanation of variations of the core, the edge end of the core is not shown. The shape of the edge end of the core in the cross-sectional view shown in FIGS. 11 to 15 may be the same as the shape of the edge end of the core 30D in the cross-sectional view shown in FIG. 10A .

The convex portion 34a shown in FIG. 11 has a first end portion 35a on the first inner surface 11a side and a second end portion 36a on the second inner surface 12a side. Viewed from the thickness direction Z of the convex portion 34a, the cross-sectional area of the region surrounded by the inner wall of the second end portion 36a is smaller than the cross-sectional area of the region surrounded by the inner wall of the first end portion 35a. If viewed from the thickness direction Z, the cross-sectional area of the area surrounded by the inner wall of the second end 36a is smaller than the cross-sectional area of the area surrounded by the inner wall of the first end 35a, then the flow of steam and the through-hole 33 can be further prevented. The liquid surface of the working medium 20 inside is in direct contact. Thereby, the influence of the counterflow can be further reduced, so the maximum heat transfer capacity of the steam chamber 1 can be further increased.

In the convex portion 34a, when viewed from the thickness direction Z, the inner wall of the second end portion 36a is located inside the inner wall of the first end portion 35a. If viewed from the thickness direction Z, the inner wall of the second end 36 a is located inward of the inner wall of the first end 35 a, which further prevents the flow of steam from directly contacting the liquid surface of the working medium 20 in the through hole 33 . Thereby, the influence of the counterflow can be further reduced, so the maximum heat transfer capacity of the steam chamber 1 can be further increased.

In the cross section along the thickness direction Z, the convex portion 34a has a tapered shape in which the distance between the outer walls of the convex portion 34a becomes narrower toward the second inner surface 12a. If the convex portion 34a has a tapered shape in the cross section along the thickness direction Z in which the distance between the outer walls of the convex portion 34a narrows toward the second inner surface 12a, then when the perforated body 32 and the second inner surface 12a flow through, When the vapor in the space between the inner surfaces 12a comes into contact with the convex portion 34a, the vapor can not only flow in a circuitous manner in the convex portion 34a, but also along the outer wall of the convex portion 34a in the cross section along the thickness direction Z. The mode flows toward the second inner surface 12a side. Therefore, compared with a convex portion 34 in a cross section along the thickness direction Z that does not have a tapered shape in which the distance between the outer walls of the convex portion 34a narrows toward the second inner surface 12a, the distance between the convex portion 34a and the convex portion 34a can be increased. The flow path of the vapor in contact. Thereby, a decrease in the thermal conductivity of the vapor chamber 1 can be suppressed.

The convex portion 34a has a shape convex toward the second inner surface 12a side (upper side in FIG. 11) in the cross section along the thickness direction Z. In other words, the convex portion 34a has a shape curved toward the second inner surface 12a side (upper side in FIG. 11) with respect to the line segment connecting the first end portion 35a and the second end portion 36a in the cross section along the thickness direction Z.

FIG. 12 is a partially enlarged cross-sectional view schematically showing a second modification example of the convex portion shown in FIG. 10A .

The convex portion 34b shown in FIG. 12 has a first end portion 35b on the first inner surface 11a side and a second end portion 36b on the second inner surface 12a side. In the cross section along the thickness direction Z, the convex portion 34b has a tapered shape in which the distance between the outer walls of the convex portion 34b becomes narrower toward the second inner surface 12a. The convex portion 34b has a shape convex toward the first inner surface 11a side (lower side in FIG. 12) in the cross section along the thickness direction Z. In other words, in the cross section along the thickness direction Z, the convex portion 34b has a shape that is curved toward the first inner surface 11a side (the lower side in FIG. 12) with respect to the line segment connecting the first end portion 35b and the second end portion 36b. . If the convex portion 34b has a shape convex toward the first inner surface 11a side (lower side in Fig. 12) in the cross section along the thickness direction Z, then the shape is convex toward the second inner surface 12a side (Fig. 11 Compared with the convex portion 34a having a convex shape (the middle is the upper side), the inclination of the outer wall surface becomes gentler in the portion of the convex portion 34b on the first end 35b side. Therefore, when the vapor flowing through the space between the porous body 32 and the second inner surface 12a comes into contact with the portion on the first end 35b side of the convex portion 34b, it is easy to flow along the cross section along the thickness direction Z. The outer wall surface of the convex portion 34a further flows toward the second inner surface 12a side. Thereby, the reduction in the thermal conductivity of the vapor chamber 1 can be further suppressed.

FIG. 13 is a partially enlarged cross-sectional view schematically showing a third modification example of the convex portion shown in FIG. 10A .

The convex portion 34c shown in FIG. 13 has a first end portion 35c on the first inner surface 11a side and a second end portion 36c on the second inner surface 12a side. When viewed from the thickness direction Z of the convex portion 34c, the cross-sectional area of the region surrounded by the inner wall of the second end portion 36c is smaller than the cross-sectional area of the region surrounded by the inner wall of the first end portion 35c. The convex part 34c is provided with the cover part 37 which narrows the opening of the convex part 34c in the 2nd end part 36c. In the convex portion 34c, when viewed from the thickness direction Z, the cross-sectional area of the region surrounded by the inner wall of the second end portion 36c is smaller compared to the convex portion 34b in which the cover portion 37 is not present in the second end portion 36c. . If the convex part 34c is provided with the cover part 37 in the second end part 36c which narrows the opening of the convex part 34c, it can further prevent the flow of steam from directly contacting the liquid surface of the working medium 20 in the through hole 33. Thereby, the influence of the counterflow can be further reduced, so the maximum heat transfer capacity of the steam chamber 1 can be further increased.

The cover portion 37 that narrows the opening of the convex portion 34c can be formed by punching the second end portion 36c, for example. The size and shape of the cover portion 37 that narrows the opening of the convex portion 34c are not particularly limited, as long as the opening of the convex portion 34c on the second end 36c side is narrowed. The cover portion 37 narrowing the opening of the convex portion 34c is preferably a flat surface. The cover portion 37 that narrows the opening of the convex portion 34c is preferably a flat surface perpendicular to the thickness direction Z. The cover portion 37 that narrows the opening of the convex portion 34c may be partially or entirely curved. The cover portion 37 that narrows the opening of the convex portion 34c may have a concave and convex shape on the surface. The thickness of the cover portion 37 that narrows the opening of the convex portion 34c may be the same as or different from the thickness of the convex portion 34c.

FIG. 14 is a partially enlarged cross-sectional view schematically showing a fourth modification example of the convex portion shown in FIG. 10A.

The convex portion 34d shown in Fig. 14 has a first end portion 35d on the first inner surface 11a side and a second end portion 36d on the second inner surface 12a side. When viewing the convex portion 34d from the thickness direction Z, the cross-sectional area of the region surrounded by the inner wall of the second end portion 36d is larger than the cross-sectional area of the region surrounded by the inner wall of the first end portion 35d.

In the convex portion 34d, when viewed from the thickness direction Z, the inner wall of the second end portion 36d is located outside the inner wall of the first end portion 35d.

FIG. 15 is a partially enlarged cross-sectional view schematically showing a fifth modification example of the convex portion shown in FIG. 10A.

The convex portion 34e shown in FIG. 15 has a first end portion 35e on the first inner surface 11a side and a second end portion 36e on the second inner surface 12a side. When viewed from the thickness direction Z of the convex portion 34e, the cross-sectional area of the region surrounded by the inner wall of the second end portion 36e is larger than the cross-sectional area of the region surrounded by the inner wall of the first end portion 35e. The convex part 34e is provided with the cover part 37 which narrows the opening of the convex part 34e in the 2nd end part 36e. In the convex portion 34e, when viewed from the thickness direction Z, compared with the convex portion 34d in which the cover portion 37 is not present in the second end portion 36e, the cross-sectional area of the region surrounded by the inner wall of the second end portion 36e is smaller. . If the convex part 34e is provided with the cover part 37 in the second end part 36e which narrows the opening of the convex part 34e, it can further prevent the flow of steam from directly contacting the liquid surface of the working medium 20 in the through hole 33. Thereby, the influence of the counterflow can be further reduced, so the maximum heat transfer capacity of the steam chamber 1 can be further increased.

The cover portion 37 that narrows the opening of the convex portion 34e can be formed by punching the second end portion 36e, for example. The size and shape of the cover portion 37 that narrows the opening of the convex portion 34e are not particularly limited, as long as the opening of the convex portion 34e on the second end 36e side is narrowed. The cover portion 37 narrowing the opening of the convex portion 34e is preferably a flat surface. The cover portion 37 that narrows the opening of the convex portion 34e is preferably a flat surface perpendicular to the thickness direction Z. The cover portion 37 that narrows the opening of the convex portion 34e may be partially or entirely curved. The surface of the cover 37 that narrows the opening of the convex portion 34e may have an uneven shape. The thickness of the cover portion 37 that narrows the opening of the protruding portion 34e may be the same as or different from the thickness of the protruding portion 34e.

FIG. 16A is a partially enlarged cross-sectional view of a fifth modification example of the schematic display core. FIG. 16B is a cross-sectional view showing an example of a state in which the working medium is enclosed in the cross-sectional view shown in FIG. 16A.

In addition, in the cross-sectional views shown in FIG. 16B and FIGS. 17 to 21 , in order to simplify the description of variations of the core, the edge end of the core is not shown. The shape of the edge end of the core in the cross-sectional view shown in FIG. 13B and FIGS. 17 to 21 may be the same as the shape of the edge end of the core 30E in the cross-sectional view shown in FIG. 16A.

In the core 30E shown in FIG. 16A , a convex portion 34 is provided on the periphery of the through hole 33 in a direction approaching the first inner surface 11 a.

The convex portion 34f has a first end portion 35f on the first inner surface 11a side and a second end portion 36f on the second inner surface 12a side.

Hereinafter, the effect produced by providing the convex portion 34f in the direction approaching the first inner surface 11a on the periphery of the through hole 33 will be described. In FIG. 16B , the working medium 20 is in contact with the surface surrounded by the inner wall of the convex portion 34 f and is sucked into the through hole 33 by capillary force. Therefore, in the portion where the core 30E does not have the through hole 33 when viewed from the thickness direction Z, even though the liquid level of the working medium 20 is located closer to the first inner surface 11 a than the porous body 32 , it is also sucked into the through hole 33 Work Media20. In this way, even when the liquid amount of the working medium 20 is small as shown in FIG. 16B , the working medium 20 can be sucked into the through hole 33 . Therefore, even when the liquid volume of the working medium 20 is small, it is possible to prevent capillary force from being easily generated in the core 30E. According to the above, in the vapor chamber 1 , even when the liquid amount of the working medium 20 is small, the deterioration of the heat distribution performance and the heat transfer performance can be suppressed.

If the convex portion 34f is provided on the periphery of the through hole 33 in the direction approaching the first inner surface 11a, even when the liquid amount of the working medium 20 is small, the deterioration of the heat distribution performance and the heat transfer performance can be suppressed. For example, changes in the design value of the liquid injection amount of the working medium 20 in the manufacturing step, differences in the liquid injection amount of the working medium 20 in the manufacturing step, changes in the liquid amount of the working medium 20 during use, etc. have an impact on the uniform heating. There is little impact on performance or heat transfer performance. That is, it can be said that if the protrusion 34f is provided on the periphery of the through hole 33 in the direction approaching the first inner surface 11a, the stability with respect to the liquid amount of the working medium 20 in the vapor chamber 1 is improved.

The convex portion 34f is preferably provided on the entire peripheral edge of the through hole 33. The convex portion 34f may be provided on only a part of the periphery of the through hole 33 as long as it has a shape that can suck the working medium 20 by capillary force.

The convex portion 34f may be provided at the periphery of all the through holes 33 in the perforated body 32, or may be provided at only the periphery of a part of the through holes 33 in the perforated body 32. When the convex portion 34f is provided only on the periphery of a part of the through-hole 33 in the perforated body 32, it is preferable that the convex portion 34f is provided on at least the periphery of the through-hole 33 located directly above the heat source HS. When the protrusion 34f is provided in the through hole 33 located directly above the heat source HS, evaporation of the working medium 20 in the evaporation part can be suppressed even when the liquid amount of the working medium 20 is small. The convex portion 34f may be provided only on the periphery of the through hole 33 located directly above the heat source HS.

The through hole 33 and the convex portion 34f can be produced, for example, by punching the metal constituting the perforated body 32 by punching. In punching by punching processing, the shape of the convex portion, etc. can be adjusted by appropriately adjusting the depth of punching. In addition, the depth of punching means, for example, how far the punching tool is pressed along the punching direction when punching is performed by a punching tool.

The size of the convex portion 34f is not particularly limited. For example, the height of the convex portion 34f can be larger than the diameter of the through hole 33 , the height of the convex portion 34f can also be smaller than the diameter of the through hole 33 , and the height of the convex portion 34f can also be the same as the diameter of the through hole 33 . In addition, in the convex part 34f shown in FIG. 16A, the height of the convex part 34f means the distance in the thickness direction Z between the 1st end part 35f and the 2nd end part 36f.

In the example shown in FIG. 16A , the bending height of the edge end of the core 30E (the distance indicated by B in FIG. 16A ) is larger than the height of the convex portion 34f. The bending height of the edge of the core 30E (distance indicated by B in FIG. 16A) may be smaller than the height of the convex part 34f, or may be the same as the height of the convex part 34f.

In addition, when the protrusion 34f is provided on the periphery of the through hole 33 in the direction close to the first inner surface 11a, the thickness of the perforated body 32 means the thickness of the perforated body 32 in the portion where the protrusion 34f is not provided. thickness.

In the core 30E shown in FIG. 16A , a part of the metal foil is bent and recessed by punching processing or the like, and a support 31 is formed in the recessed part. The core 30E can be formed by collectively performing a punching process to form the support 31 and a punching process to form the through-hole 33 and the convex portion 34f.

The core 30E shown in FIG. 16A can be like the core 30A shown in FIG. 7, the core 30B shown in FIG. 8, and the core 30C shown in FIG. 9, and the support 31 is not recessed.

FIG. 17 is a partially enlarged cross-sectional view schematically showing a first modification example of the convex portion shown in FIG. 16A.

The convex part 34g shown in FIG. 17 has the 1st end part 35g on the 1st inner surface 11a side, and the 2nd end part 36g on the 2nd inner surface 12a side. When viewing the convex portion 34g from the thickness direction Z, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35g is smaller than the cross-sectional area of the region surrounded by the inner wall of the second end portion 36g. If viewed from the thickness direction Z, the cross-sectional area of the area surrounded by the inner wall of the first end 35g is smaller than the cross-sectional area of the area surrounded by the inner wall of the second end 36g, then it can be increased from the first end 35g The capillary force generated in the area surrounded by the inner wall. Therefore, the capillary force of the core 30E can be increased, and thus the maximum heat transfer capacity of the vapor chamber 1 can be increased.

In the convex portion 34g, when viewed from the thickness direction Z, the inner wall of the first end portion 35g can be located inward of the inner wall of the second end portion 36g.

In the cross section along the thickness direction Z, the convex portion 34g has a tapered shape in which the distance between the outer walls of the convex portion 34g becomes narrower toward the first inner surface 11a.

The convex portion 34g has a shape convex toward the first inner surface 11a side (lower side in FIG. 17) in the cross section along the thickness direction Z. In other words, the convex portion 34g has a shape curved toward the first inner surface 11a side (lower side in FIG. 17 ) with respect to the line segment connecting the first end portion 35g and the second end portion 36g in the cross section along the thickness direction Z. .

FIG. 18 is a partially enlarged cross-sectional view schematically showing a second modification example of the convex portion shown in FIG. 16A.

The convex part 34h shown in FIG. 18 has the 1st end part 35h on the 1st inner surface 11a side, and the 2nd end part 36h on the 2nd inner surface 12a side. In the cross section along the thickness direction Z, the convex portion 34h has a tapered shape in which the distance between the outer walls of the convex portion 34h becomes narrower toward the first inner surface 11a. The convex portion 34h has a shape convex toward the second inner surface 12a side (upper side in FIG. 18) in the cross section along the thickness direction Z. In other words, the convex portion 34h has a shape curved toward the second inner surface 12a side (upper side in FIG. 18) with respect to the line segment connecting the first end portion 35h and the second end portion 36h in the cross section along the thickness direction Z.

FIG. 19 is a partially enlarged cross-sectional view schematically showing a third modification example of the convex portion shown in FIG. 16A.

The convex portion 34i shown in FIG. 19 has a first end portion 35i on the first inner surface 11a side and a second end portion 36i on the second inner surface 12a side. When viewed from the thickness direction Z of the convex portion 34i, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35i is smaller than the cross-sectional area of the region surrounded by the inner wall of the second end portion 36i. The convex part 34i is provided with the cover part 37 which narrows the opening of the convex part 34i in the 1st end part 35i. In the convex portion 34i, when viewed from the thickness direction Z, compared with the convex portion 34h in which the cover portion 37 is not present in the first end portion 35i, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35i is smaller. .

The cover portion 37 that narrows the opening of the convex portion 34i can be formed by punching the first end portion 35i, for example. The size and shape of the cover portion 37 that narrows the opening of the convex portion 34i are not particularly limited, as long as the opening of the convex portion 34i on the first end 35i side is narrowed. The cover portion 37 narrowing the opening of the convex portion 34i is preferably a flat surface. The cover portion 37 that narrows the opening of the convex portion 34i is preferably a flat surface perpendicular to the thickness direction Z. The cover portion 37 that narrows the opening of the convex portion 34i may be partially or entirely curved. The cover portion 37 that narrows the opening of the convex portion 34i may have an uneven surface. The thickness of the cover portion 37 that narrows the opening of the protruding portion 34i may be the same as or different from the thickness of the protruding portion 34i.

FIG. 20 is a partially enlarged cross-sectional view schematically showing a fourth modification example of the convex portion shown in FIG. 16A.

The convex portion 34j shown in FIG. 20 has a first end portion 35j on the first inner surface 11a side and a second end portion 36j on the second inner surface 12a side. When viewed from the thickness direction Z of the convex portion 34j, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35j is larger than the cross-sectional area of the region surrounded by the inner wall of the second end portion 36j. If viewed from the thickness direction Z, the cross-sectional area of the area surrounded by the inner wall of the first end 35j is larger than the cross-sectional area of the area surrounded by the inner wall of the second end 36j, then the working medium in the through hole 33 can be increased. 20 puffs. If the amount of the working medium 20 sucked into the through hole 33 is large, the working medium 20 in the vapor chamber 1 gradually decreases until the working medium 20 is completely no longer sucked into the through hole 33 . The allowable value of the change of 20 becomes larger. Thus, the robustness with respect to the liquid volume of the working medium 20 in the vapor chamber 1 is increased.

In the convex portion 34j, when viewed from the thickness direction Z, the inner wall of the first end portion 35j can be located outside the inner wall of the second end portion 36j.

FIG. 21 is a partially enlarged cross-sectional view schematically showing a fifth modification example of the convex portion shown in FIG. 16A.

The convex portion 34k shown in FIG. 21 has a first end portion 35k on the first inner surface 11a side and a second end portion 36k on the second inner surface 12a side. When viewed from the thickness direction Z of the convex portion 34k, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35k is larger than the cross-sectional area of the region surrounded by the inner wall of the second end portion 36k. The convex part 34k is provided with the cover part 37 which narrows the opening of the convex part 34k in the 1st end part 35k. In the convex portion 34k, when viewed from the thickness direction Z, the cross-sectional area of the region surrounded by the inner wall of the first end portion 35k is smaller than that of the convex portion 34j in which the cover portion 37 is not present in the first end portion 35k. .

The cover portion 37 that narrows the opening of the convex portion 34k can be formed by punching the first end portion 35k, for example. The size and shape of the cover portion 37 that narrows the opening of the convex portion 34k are not particularly limited, as long as the opening of the convex portion 34k on the first end 35k side is narrowed. The cover portion 37 narrowing the opening of the convex portion 34k is preferably a flat surface. The cover portion 37 that narrows the opening of the convex portion 34k is preferably a flat surface perpendicular to the thickness direction Z. The cover portion 37 that narrows the opening of the convex portion 34k may be partially or entirely curved. The cover portion 37 that narrows the opening of the convex portion 34k may have a concave and convex shape on the surface. The thickness of the cover portion 37 that narrows the opening of the protruding portion 34k may be the same as or different from the thickness of the protruding portion 34k.

FIG. 22 is a top view of a sixth modification example of the schematic display core. In addition, FIG. 22 is a top view of the core viewed from the support side.

In the core 30F shown in Figure 22, the support 31 includes a plurality of track-shaped members. By maintaining the liquid phase working medium 20 between the rail-like members, the heat transfer performance of the vapor chamber 1 can be improved. Here, "orbital shape" means a shape in which the ratio of the length of the long side of the bottom surface to the length of the short side of the bottom surface is 5 times or more.

The cross-sectional shape of the track-shaped member perpendicular to the extending direction is not particularly limited, and examples thereof include polygonal shapes such as squares, semicircles, semiellipses, and shapes that are a combination thereof.

The rail-shaped member only needs to be relatively higher than its surroundings. Therefore, in addition to the portion protruding from the first inner surface 11a, the rail-shaped member also includes a portion whose height is relatively higher than the groove formed in the first inner surface 11a.

In addition, the core 30F is not limited to the shape shown in FIG. 22 and may be partially arranged and utilized instead of being arranged in the entire internal space. For example, a track-shaped support body 31 may be formed in the inner space along the outer circumference, and a porous body 32 shaped along the outer circumference may be disposed thereon.

FIG. 23 is a top view schematically showing the arrangement of the core of the heat diffusion device shown in FIG. 1 when viewed from the thickness direction.

In the vapor chamber 1 shown in FIG. 23 , when viewed from the thickness direction Z, the core 30 is disposed throughout the entire internal space of the housing 10 .

In the vapor chamber 1 , when viewed from the thickness direction Z, the evaporation portion EP (evaporation portion) overlaps the inner edge of the housing 10 . In the vapor chamber 1 shown in FIG. 23 , when viewed from the thickness direction Z, the evaporation part EP overlaps with the core 30 .

In FIG. 23 , the edge end of the core 30 is not in contact with the inner edge of the housing 10 . The edge end of the core 30 can be connected with the inner edge of the housing 10 .

FIG. 24 is a plan view schematically showing the arrangement of the core of the first variation of the thermal diffusion device of the present invention when viewed from the thickness direction.

In the vapor chamber (thermal diffusion device) 1A shown in FIG. 24 , when viewed from the thickness direction Z, the core 30 is disposed throughout the entire internal space of the housing 10 , and the internal space has a structure configured as viewed from the thickness direction Z. The area of the core 30 and the area where the core 30 is not arranged extend linearly when viewed from the thickness direction Z.

In the vapor chamber 1A, the area where the core 30 is not arranged may extend linearly or curvedly when viewed from the thickness direction Z.

In the steam chamber 1A, the edge end of the core 30 on the inner edge side of the housing 10 is bent in such a manner as to approach the second inner surface 12a side. Among the edge ends of the core 30, the edge end on the side of the area where the core 30 is not arranged may or may not be bent so as to approach the second inner surface 12a side.

In FIG. 24 , the edge end of the core 30 is not in contact with the inner edge of the housing 10 . The edge end of the core 30 can be connected with the inner edge of the housing 10 .

In the vapor chamber 1A shown in FIG. 24 , when viewed from the thickness direction Z, the evaporation part EP overlaps the inner edge of the housing 10 . In the vapor chamber 1A shown in FIG. 24 , the area where the core 30 is not arranged may extend to the evaporation part EP when viewed from the thickness direction Z, or may not extend to the evaporation part EP.

FIG. 25 is a plan view schematically showing the arrangement of the core of the second modification example of the thermal diffusion device of the present invention when viewed from the thickness direction.

In the vapor chamber (thermal diffusion device) 1B shown in FIG. 25 , the core 30 is arranged along the outer periphery of the internal space of the housing 10 when viewed from the thickness direction Z.

In the steam chamber 1B, the edge end of the core 30 on the inner edge side of the housing 10 is bent in such a manner as to approach the second inner surface 12a side. The edge end of the core 30 on the side of the hollow region of the core 30 may or may not be bent in a manner approaching the second inner surface 12a side.

In the vapor chamber 1B shown in FIG. 25 , when viewed from the thickness direction Z, the evaporation part EP overlaps the inner edge of the housing 10 . In the vapor chamber 1B shown in FIG. 25 , when viewed from the thickness direction Z, the evaporation part EP overlaps with the core 30 .

In FIG. 25 , the edge end of the core 30 is not in contact with the inner edge of the housing 10 . The edge end of the core 30 can be connected with the inner edge of the housing 10 .

FIG. 26 is a cross-sectional view schematically showing a third modification example of the thermal diffusion device.

In the vapor chamber (thermal diffusion device) 1C shown in FIG. 26 , the support 31 is integrally formed with the first sheet 11 of the housing 10 . In the vapor chamber 1C, the first sheet 11 and the support 31 can be produced by, for example, etching technology, printing technology using multi-layer coating, or other multi-layer technology. In the steam chamber 1C, the porous body 32 may be made of the same material as the support 31 and the first sheet 11 of the housing 10, or may be made of different materials. The porous body 32 may be integrally formed with the support body 31 and the first sheet 11 of the housing 10 .

FIG. 27 is a cross-sectional view schematically showing a fourth modification example of the thermal diffusion device.

In the vapor chamber (thermal diffusion device) 1D shown in FIG. 27, a part of the first inner surface 11a of the housing 10 is bent and recessed by, for example, punching processing, and thereby, the recessed part is formed. There is a support body 31.

The thermal diffusion device of the present invention is not limited to the above-described embodiment, and various applications and changes can be applied to the structure, manufacturing conditions, etc. of the thermal diffusion device within the scope of the present invention.

In the heat diffusion device of the present invention, the housing may have one evaporation part or a plurality of evaporation parts. That is to say, one heat source can be disposed on the outer surface of the casing, or a plurality of heat sources can be disposed. The number of evaporation parts and heat sources is not particularly limited.

In the thermal diffusion device of the present invention, when the housing is composed of a first sheet and a second sheet, the first sheet and the second sheet may be overlapped so that their ends are aligned, or their ends may be offset. And overlap.

In the thermal diffusion device of the present invention, when 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 may be different. For example, by using a high-strength material for the first sheet, the stress applied to the housing can be dispersed. Furthermore, by making the two materials different, one function can be obtained by using one piece of material, and another function can be obtained by using another sheet of material. The above functions are not particularly limited, and examples thereof include heat conduction function, electromagnetic wave shielding function, and the like.

The thermal diffusion device of the present invention can be mounted on electronic equipment for the purpose of heat dissipation. Therefore, electronic equipment equipped with the thermal diffusion device of the present invention is also one of the present invention. Examples of electronic devices of the present invention include smartphones, tablet terminals, notebook personal computers, game machines, and wearable devices. As mentioned above, the thermal diffusion device of the present invention works independently without external power, and utilizes the latent heat of evaporation and condensation heat of the working medium to diffuse heat in two dimensions at a high speed. Therefore, by using an electronic device equipped with the thermal diffusion device of the present invention, heat dissipation can be effectively achieved in a limited space inside the electronic device.

The following contents are disclosed in this manual.

<1> A thermal diffusion device, which includes: a shell, which has a first inner surface and a second inner surface facing each other in the thickness direction; a working medium, which is enclosed in the internal space of the above-mentioned shell; and a core, which is configured In the above-mentioned internal space of the above-mentioned shell; and the above-mentioned core includes: a support body connected with the above-mentioned first inner surface, and a perforated body connected with the above-mentioned support body; the edge end of the above-mentioned core is directed towards the above-mentioned first inner surface Curved in a side-to-side approach.

<2> The thermal diffusion device of <1>, wherein in the cross section along the thickness direction, there is a gap between the edge end of the core and the inner edge of the housing in a direction perpendicular to the thickness direction.

<3> The thermal diffusion device of <1> or <2>, wherein the above-mentioned shell system is composed of a first sheet and a second sheet whose outer edges are joined and opposed in the above-mentioned thickness direction; and The above-mentioned first sheet The joint portion between the material and the second sheet is located at a position different from the edge end of the core in the thickness direction.

＜4＞ The thermal diffusion device according to any one of ＜1＞ to ＜3>, further comprising a pillar arranged in the above-mentioned internal space in a manner connected to the above-mentioned second inner surface of the above-mentioned casing; and The height of the pillar is greater than the height of the above-mentioned supporting body.

<5> The thermal diffusion device of <4>, wherein the circular equivalent diameter of the cross section perpendicular to the height direction of the support is larger than the circular equivalent diameter of the cross section perpendicular to the height direction of the support.

<6> The thermal diffusion device of <4> or <5>, wherein the distance between the centers of the adjacent pillars is larger than the distance between the centers of the adjacent supports.

<7> The thermal diffusion device according to any one of <1> to <6>, wherein the porous system is made of the same material as the support.

<8> The thermal diffusion device of <7>, wherein the porous body and the support system are composed of porous bodies.

<9> The thermal diffusion device according to any one of <1> to <6>, wherein the porous system is composed of a material different from that of the support.

<10> The thermal diffusion device of <9>, wherein the porous system is composed of a porous body.

<11> The thermal diffusion device according to any one of <1> to <10>, wherein the thickness of the support is the same as or smaller than the thickness of the porous body.

<12> The thermal diffusion device according to any one of <1> to <11>, wherein the porous body has a through hole penetrating along the thickness direction; and the periphery of the through hole is close to the second inner surface A convex portion is provided in the direction.

<13> The thermal diffusion device of <12>, wherein the convex portion has a first end on the first inner surface side and a second end on the second inner surface side; and Viewed from the thickness direction, the above-mentioned first end The cross-sectional area of the area surrounded by the inner wall of the second end is smaller than the cross-sectional area of the area surrounded by the inner wall of the first end.

<14> The thermal diffusion device according to any one of <1> to <11>, wherein the porous body has a through hole penetrating along the thickness direction; and the periphery of the through hole is close to the first inner surface A convex portion is provided in the direction.

<15> The thermal diffusion device of <14>, wherein the convex portion has a first end on the first inner surface side and a second end on the second inner surface side; and Viewed from the thickness direction, the above-mentioned first end The cross-sectional area of the area surrounded by the inner wall of the first end is smaller than the cross-sectional area of the area surrounded by the inner wall of the second end.

<16> The thermal diffusion device according to any one of <1> to <15>, wherein the core is disposed throughout the entire internal space of the housing when viewed from the thickness direction.

<17> The thermal diffusion device according to any one of <1> to <15>, wherein when viewed from the thickness direction, the above-mentioned core is disposed throughout the entirety of the above-mentioned internal space of the above-mentioned housing; and The above-mentioned internal space is in When viewed from the above-mentioned thickness direction, it has an area where the above-mentioned core is arranged, and an area where the above-mentioned core is not arranged; The area where the above-mentioned core is not arranged extends linearly when viewed from the above-mentioned thickness direction.

<18> The thermal diffusion device according to any one of <1> to <15>, wherein the core is arranged along the outer periphery of the internal space of the housing when viewed from the thickness direction.

<19> An electronic device including the thermal diffusion device according to any one of <1> to <18>. [Industrial availability]

The thermal diffusion device of the present invention can be used in a wide range of applications in fields such as portable information terminals. For example, it can be used to reduce the temperature of heat sources such as CPUs and extend the use time of electronic equipment. It can be used in smartphones, tablet terminals, notebook personal computers, etc.

1, 1A, 1B, 1C, 1D: Vapor chamber (thermal diffusion device) 10: Case 11: 1st sheet 11a: 1st inner surface 12: 2nd sheet 12a: 2nd inner surface 13: Joint part 20 : Working media 30, 30A, 30B, 30C, 30D, 30E, 30F: Core 31: Support body 32: Perforated body 33: Through hole 34, 34a, 34b, 34c, 34d, 34e, 34f, 34g, 34h, 34i , 34j, 34k: convex portion 35, 35a, 35b, 35c, 35d, 35e, 35f, 35g, 35h, 35i, 35j, 35k: first end 36, 36a, 36b, 36c, 36d, 36e, 36f, 36g , 36h, 36i, 36j, 36k: 2nd end 37: Cover 40: Pillar A: The distance between the far end of the core and the inner edge of the shell B: The bending height of the edge of the core C: The distance between the edge of the core Bend width EP: Evaporation part HS: Heat source II-II: Line III: Part P ₃₁ : Distance between the centers of the support P ₃₃ : Distance between the centers of the through holes R: Area T ₃₁ : Height of the support T ₃₂ : Hole Thickness of body W ₃₁ : Width of support body X: Width direction Y: Length direction Z: Thickness direction ϕ ₃₃ : Diameter of through hole

FIG. 1 is a perspective view schematically showing an example of the heat diffusion device of the present invention. Figure 2 is an example of a cross-sectional view along line II-II of the thermal diffusion device shown in Figure 1. Figure 3 is an enlarged view of part III of Figure 2. Figure 4 is an enlarged view showing a modification example of part III of Figure 2. FIG. 5 is a partially enlarged cross-sectional view schematically showing an example of the core constituting the heat diffusion device shown in FIG. 2 . Figure 6 is a top view of the core shown in Figure 5 viewed from the side of the self-supporting body. Figure 7 is a partially enlarged cross-sectional view of the first variation of the schematic display core. Figure 8 is a partially enlarged cross-sectional view of the second modification example of the schematic display core. Figure 9 is a partially enlarged cross-sectional view of a third modification example of the schematic display core. 10A is a partially enlarged cross-sectional view of a fourth modification example of the schematic display core. 10B is a plan view schematically showing the flow of vapor in the through holes, the convex portions, and the vicinity of the convex portions when the core shown in FIG. 10A is viewed from the side of the porous body. Fig. 11 is a partially enlarged cross-sectional view schematically showing a first variation of the convex portion shown in Fig. 10A. Fig. 12 is a partially enlarged cross-sectional view schematically showing a second modification example of the convex portion shown in Fig. 10A. Fig. 13 is a partially enlarged cross-sectional view schematically showing a third modification example of the convex portion shown in Fig. 10A. 14 is a partially enlarged cross-sectional view schematically showing a fourth variation example of the convex portion shown in FIG. 10A. Fig. 15 is a partially enlarged cross-sectional view schematically showing a fifth modification example of the convex portion shown in Fig. 10A. 16A is a partially enlarged cross-sectional view of a fifth modification example of the schematic display core. 16B is a cross-sectional view showing an example of a state in which a working medium is enclosed in the cross-sectional view shown in FIG. 16A. Fig. 17 is a partially enlarged cross-sectional view schematically showing a first variation of the convex portion shown in Fig. 16A. Fig. 18 is a partially enlarged cross-sectional view schematically showing a second modification example of the convex portion shown in Fig. 16A. Fig. 19 is a partially enlarged cross-sectional view schematically showing a third modification example of the convex portion shown in Fig. 16A. Fig. 20 is a partially enlarged cross-sectional view schematically showing a fourth modification example of the convex portion shown in Fig. 16A. Fig. 21 is a partially enlarged cross-sectional view schematically showing a fifth modification example of the convex portion shown in Fig. 16A. Figure 22 is a top view of the sixth modification example of the schematic display core. Figure 23 is a top view schematically showing the arrangement of the core of the heat diffusion device shown in Figure 1 when viewed from the thickness direction. 24 is a top view schematically showing the arrangement of the core of the first variation of the thermal diffusion device of the present invention when viewed from the thickness direction. 25 is a top view schematically showing the arrangement of the core of the second variation of the thermal diffusion device of the present invention when viewed from the thickness direction. 26 is a cross-sectional view schematically showing a third modification example of the heat diffusion device. 27 is a cross-sectional view schematically showing a fourth modification example of the heat diffusion device.

1: Vapor chamber (heat diffusion device)

10: Shell

11:Sheet 1

11a: 1st inner surface

12: 2nd sheet

12a: 2nd inner surface

13:Joint

20:Work media

30:core

31:Support

32: Porous body

33:Through hole

40:Pillar

III:Part

X: width direction

Y: length direction

Z:Thickness direction

Claims (19)

A thermal diffusion device, which includes: a shell, which has a first inner surface and a second inner surface facing each other in the thickness direction; a working medium, which is enclosed in the internal space of the aforementioned shell; and a core, which is arranged in the aforementioned shell The aforementioned internal space of the body; and the aforementioned core includes: a support body connected with the aforementioned first inner surface, and a porous body connected with the aforementioned support body; the edge end of the aforementioned core is close to the side of the aforementioned first inner surface Way to bend. The thermal diffusion device of claim 1, wherein in a cross section along the thickness direction, there is a gap between the edge end of the core and the inner edge of the housing in a direction perpendicular to the thickness direction. The thermal diffusion device of claim 1 or 2, wherein the aforementioned shell system is composed of a first sheet and a second sheet whose outer edges are joined and face each other in the aforementioned thickness direction; and The aforementioned first sheet and the aforementioned second sheet The joint portion of the sheet material is located at a different position from the edge end of the core in the thickness direction. The thermal diffusion device of Claim 1 or 2, further comprising a pillar, which is arranged in the aforementioned internal space in a manner connected to the front second inner surface of the aforementioned housing; and the height of the aforementioned pillar is greater than the height of the aforementioned support body For big. The thermal diffusion device of claim 4, wherein the circular equivalent diameter of the cross section perpendicular to the height direction of the support is larger than the circular equivalent diameter of the cross section perpendicular to the height direction of the support. The thermal diffusion device of claim 5, wherein the distance between the centers of the adjacent pillars is larger than the distance between the centers of the adjacent supports. The thermal diffusion device of claim 1 or 2, wherein the porous system is made of the same material as the support. The thermal diffusion device of claim 7, wherein the porous body and the support system are composed of porous bodies. The thermal diffusion device of claim 1 or 2, wherein the porous system is made of a material different from that of the support. The thermal diffusion device of claim 9, wherein the porous system is composed of a porous body. The thermal diffusion device of claim 1 or 2, wherein the thickness of the aforementioned support body is the same as the thickness of the aforementioned porous body, or is smaller than the thickness of the aforementioned porous body. The thermal diffusion device of claim 1 or 2, wherein the porous body has a through hole penetrating along the thickness direction; and a protrusion is provided on the periphery of the through hole in a direction approaching the second inner surface. The thermal diffusion device of claim 12, wherein the convex portion has a first end on the first inner side and a second end on the second inner side; and Viewed from the thickness direction, the second end The cross-sectional area of the area surrounded by the inner wall is smaller than the cross-sectional area of the area surrounded by the inner wall of the first end. The thermal diffusion device of claim 1 or 2, wherein the porous body has a through hole penetrating along the thickness direction; and a protrusion is provided on the periphery of the through hole in a direction approaching the first inner surface. The thermal diffusion device of claim 14, wherein the convex portion has a first end on the first inner side and a second end on the second inner side; and Viewed from the thickness direction, the first end The cross-sectional area of the area surrounded by the inner wall is smaller than the cross-sectional area of the area surrounded by the inner wall of the second end. The thermal diffusion device according to claim 1 or 2, wherein when viewed from the thickness direction, the core is disposed throughout the entire internal space in front of the housing. The thermal diffusion device of claim 1 or 2, wherein when viewed from the aforementioned thickness direction, the aforementioned core is disposed throughout the entirety of the aforementioned internal space in front of the aforementioned housing; and the aforementioned interior space has a configuration when viewed from the aforementioned thickness direction The area of the aforementioned core, and the area where the aforementioned core is not arranged; The area where the aforementioned core is not arranged extends linearly when viewed from the aforementioned thickness direction. The thermal diffusion device according to claim 1 or 2, wherein when viewed from the thickness direction, the core is arranged along the outer periphery of the internal space in front of the housing. An electronic machine including the thermal diffusion device of claim 1 or 2.