WO2022107479A1 - Heat spreading device - Google Patents

Abstract

A vapor chamber 1, which is an embodiment of a heat spreading device, comprises a housing 10, a working medium 20, and a wick 30. The wick 30 includes a first porous body 41 and a second porous body 42 which support a first inner wall surface 11a and a second inner wall surface 12a of the housing 10 from inside. The first porous body 41 extends along a direction perpendicular to a thickness direction Z, and is split via a first split region R1 in the extending direction. The second porous body 42 is disposed with a gap from the first porous body 41 so as to be fitted in the first split region R1.

Description

Heat diffusion device

The present invention relates to a heat diffusion device.

In recent years, the amount of heat generated has increased due to the high integration and high performance of elements. In addition, as the miniaturization of products progresses, the heat generation density increases, so heat dissipation measures are important. This situation is especially noticeable in the field of mobile terminals such as smartphones and tablets. As the heat countermeasure member, a graphite sheet or the like is often used, but since the heat transport amount is not sufficient, the use of various heat countermeasure members is being considered. In particular, the use of a vapor chamber, which is a planar heat pipe, is being studied as a heat diffusion device capable of diffusing heat very effectively.

The vapor chamber has a structure in which a working medium and a wick that transports the working medium by capillary force are enclosed inside the housing. The working medium absorbs heat from the heat generating element in the evaporation unit that absorbs heat from the heat generating element and evaporates in the vapor chamber, then moves in the vapor chamber, is cooled, and returns to the liquid phase. The working medium that has returned to the liquid phase moves to the evaporation part on the heat generating element side again by the capillary force of the wick, and cools the heat generating element. By repeating this, the vapor chamber operates independently without having external power, and can diffuse heat two-dimensionally at high speed by utilizing the latent heat of vaporization and the latent heat of condensation of the working medium.

The vapor chamber is also required to be thinner in order to support the thinner mobile terminals such as smartphones and tablets. In such a thin vapor chamber, it becomes difficult to secure mechanical strength and heat transfer efficiency.

Therefore, as described in Patent Document 1, in order to secure the mechanical strength of the housing constituting the vapor chamber, the wick arranged inside the housing is supported to maintain the shape of the housing. It has been proposed to be used as a body.

In the vapor chamber described in Patent Document 1, a pair of inner wall surfaces facing each other of the housing, a side surface of the wick that does not contact the pair of inner wall surfaces, and a facing surface formed with a gap from the side surface of the wick. In the enclosed space, a liquid pool flow path of condensed working fluid is formed. According to Patent Document 1, by combining the wick and the liquid pool flow path, it is possible to create a state in which the liquid is always supplied to the wick, so that the pressure loss of the liquid as a whole of the liquid flow path can be reduced, and the pressure loss of the liquid can be reduced. As a result, it is said that the maximum heat transport amount of the vapor chamber can be increased.

Japanese Unexamined Patent Publication No. 2019-11370 (Patent No. 6442594)

In a thin vapor chamber, it is assumed that the housing is bent and arranged according to the shape of the place where the vapor chamber is incorporated.

However, depending on the bending direction of the housing, the wick placed inside the housing may also be bent. In that case, since a large stress is applied to the portion of the wick that is the starting point of bending, coarse defects such as cracks are likely to occur. As a result, the capillary force of the wick cannot be maintained, and the heat transport capacity may decrease.

The above problem is not limited to the vapor chamber, but is a problem common to heat diffusion devices capable of diffusing heat by the same configuration as the vapor chamber.

An object of the present invention is to provide a heat diffusion device in which the capillary force of the wick is maintained and a high heat transfer capacity is obtained when the housing is bent. It is also an object of the present invention to provide an electronic device provided with the heat diffusion device.

The heat diffusion device of the present invention has a housing having a first inner wall surface and a second inner wall surface facing each other in the thickness direction, an actuating medium enclosed in the internal space of the housing, and the internal space of the housing. Equipped with a placed wick. The wick includes a first porous body and a second porous body that support the first inner wall surface and the second inner wall surface of the housing from the inside. The first porous body extends along a direction perpendicular to the thickness direction, and is divided through the first dividing region in the extending direction. The second porous body is arranged with a gap from the first porous body so as to fit in the first divided region.

The electronic device of the present invention includes the heat diffusion device of the present invention.

According to the present invention, it is possible to provide a heat diffusion device having a high heat transport capacity by maintaining the capillary force of the wick when the housing is bent.

FIG. 1 is a perspective view schematically showing an example of a vapor chamber according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II of the vapor chamber shown in FIG. FIG. 3 is a cross-sectional view taken along the line III-III of the vapor chamber shown in FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV of the vapor chamber shown in FIG. FIG. 5 is a cross-sectional view schematically showing a state in which the vapor chamber shown in FIG. 4 is bent. FIG. 6 is a modification of FIG. FIG. 7 is a modification of FIG. 4. FIG. 8 is a plan view schematically showing an example of the first porous body and the third porous body formed on the first sheet. FIG. 9 is a cross-sectional view of the first porous body as seen from the direction indicated by the arrow IX in FIG. FIG. 10 is a cross-sectional view of the first porous body seen from the direction indicated by the arrow X in FIG. FIG. 11 is a plan view schematically showing an example of the second porous body and the fourth porous body formed on the second sheet. FIG. 12 is a cross-sectional view of the second porous body as seen from the direction indicated by the arrow XII in FIG. FIG. 13 is a cross-sectional view of the second porous body as seen from the direction indicated by the arrow XIII in FIG. FIG. 14 is a cross-sectional view schematically showing an example of a vapor chamber according to a second embodiment of the present invention. FIG. 15 is a cross-sectional view schematically showing an example of a vapor chamber according to a third embodiment of the present invention. FIG. 16 is a cross-sectional view schematically showing an example of a vapor chamber according to a fourth embodiment of the present invention. FIG. 17 is a cross-sectional view schematically showing an example of a vapor chamber according to a fifth embodiment of the present invention. FIG. 18 is a cross-sectional view schematically showing an example of a vapor chamber according to a sixth embodiment of the present invention. FIG. 19 is a cross-sectional view taken along the line XIX-XIX of the vapor chamber shown in FIG.

Hereinafter, the heat 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 without changing the gist of the present invention. It should be noted that a combination of two or more of the individual preferable configurations described below is also the present invention.

It goes without saying that each embodiment shown below is an example, and partial replacement or combination of the configurations shown in different embodiments is possible. In the second and subsequent embodiments, the description of the matters common to the first embodiment will be omitted, and only the differences will be described. In particular, the same action and effect due to the same configuration will not be mentioned sequentially for each embodiment.

In the following description, when each embodiment is not particularly distinguished, it is simply referred to as "heat diffusion device of the present invention".

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

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

[First Embodiment]
FIG. 1 is a perspective view schematically showing an example of a vapor chamber according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II of the vapor chamber shown in FIG. FIG. 3 is a cross-sectional view taken along the line III-III of the vapor chamber shown in FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV of the vapor chamber shown in FIG.

The vapor chamber 1 shown in FIG. 1 includes a hollow housing 10 that is hermetically sealed. As shown in FIGS. 3 and 4, the housing 10 has a first inner wall surface 11a and a second inner wall surface 12a facing each other in the thickness direction Z. As shown in FIG. 2, the vapor chamber 1 further includes a working medium 20 enclosed in the internal space of the housing 10 and a wick 30 arranged in the internal space of the housing 10.

As shown in FIG. 2, the housing 10 is provided with an evaporation unit EP that evaporates the enclosed working medium 20. Further, the housing 10 may be set with a condensation portion CP for condensing the evaporated working medium 20. As shown in FIG. 1, a heat source HS, which is a heat generating element, is arranged on the outer wall surface of the housing 10. Examples of the heat source HS include electronic components of electronic devices, such as a central processing unit (CPU). In the internal space of the housing 10, the portion near the heat source HS and heated by the heat source HS corresponds to the evaporation portion EP. On the other hand, the portion away from the evaporation portion EP corresponds to the condensation portion CP. Further, the evaporated working medium 20 can be condensed other than the condensed portion CP. In the present embodiment, a portion where the evaporated working medium 20 is particularly easy to condense is expressed as a condensing portion CP.

The vapor chamber 1 is planar as a whole. That is, the housing 10 is planar as a whole. Here, the "plane" includes a plate shape and a sheet shape, and the dimension in the width direction X (hereinafter referred to as "width") and the dimension in the length direction Y (hereinafter referred to as "length") are in the thickness direction Z. It means a shape that is considerably larger than a dimension (hereinafter referred to as thickness or height), for example, a shape having a width and a length of 10 times or more, preferably 100 times or more the thickness.

The size of the vapor chamber 1, that is, the size of the housing 10 is not particularly limited. The width and length of the vapor chamber 1 can be appropriately set according to the intended use. The width and length of the vapor chamber 1 are, for example, 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 vapor chamber 1 may be the same or different.

It is preferable that the housing 10 is composed of the first sheet 11 and the second sheet 12 facing each other to which the outer edges are joined. The materials constituting the first sheet 11 and the second sheet 12 are not particularly limited as long as they have properties suitable for use as a vapor chamber, such as thermal conductivity, strength, flexibility, and flexibility. The material constituting the first sheet 11 and the second sheet 12 is preferably a metal, for example, copper, nickel, aluminum, magnesium, titanium, iron, or an alloy containing them as a main component, and particularly preferably copper. Is. 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 first sheet 11 and the second sheet 12 are joined to each other at their outer edges. The joining method is not particularly limited, and for example, laser welding, resistance welding, diffusion welding, brazing, TIG welding (tungsten-inert gas welding), ultrasonic welding, or resin encapsulation can be used, and is preferable. Can use laser welding, resistance welding or low welding.

The thicknesses of the first sheet 11 and the second sheet 12 are not particularly limited, but are preferably 10 μm or more and 200 μm or less, more preferably 30 μm or more and 100 μm or less, and further preferably 40 μm or more and 60 μm or less, respectively. The thicknesses of the first sheet 11 and the second sheet 12 may be the same or different. Further, the thickness of each of the first sheet 11 and the second sheet 12 may be the same throughout, or a part thereof may be thin.

The shapes of the first sheet 11 and the second sheet 12 are not particularly limited. For example, in the examples shown in FIGS. 3 and 4, the first sheet 11 has a flat plate shape having a constant thickness, and the second sheet 12 has a shape in which the outer edge portion is thicker than the portion other than the outer edge portion.

Alternatively, even if the first sheet 11 has a flat plate shape having a constant thickness and the second sheet 12 has a constant thickness and a portion other than the outer edge portion is convex outward with respect to the outer edge portion. good. In this case, a dent is formed on the outer edge of the housing 10. Therefore, the dent on the outer edge can be used when mounting the vapor chamber. Further, other parts and the like can be arranged in the recess of the outer edge portion.

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

The working medium 20 is not particularly limited as long as it can cause a gas-liquid phase change in the environment inside the housing 10, and for example, water, alcohols, CFC substitutes, or the like can be used. For example, the working medium is an aqueous compound, preferably water.

The wick 30 includes a first porous body 41, a second porous body 42, a third porous body 43, and a fourth porous body 44. These porous bodies function as wicks that transport the working medium 20 by capillary force. Further, by using a porous body as a support of the housing 10, the weight of the vapor chamber 1 can be reduced.

The first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44 each support the first inner wall surface 11a and the second inner wall surface 12a of the housing 10 from the inside. By arranging these porous bodies in the internal space of the housing 10, it is possible to absorb the impact from the outside of the housing 10 while ensuring the mechanical strength of the housing 10.

In the example shown in FIG. 3, the first porous body 41 is in contact with the first inner wall surface 11a and the second inner wall surface 12a, and similarly, the third porous body 43 is in contact with the first inner wall surface 11a and the second inner wall surface 12a. It is in contact with 12a. Further, in the example shown in FIG. 4, the second porous body 42 is in contact with the first inner wall surface 11a and the second inner wall surface 12a. Although not shown, the fourth porous body 44 is in contact with the first inner wall surface 11a and the second inner wall surface 12a, as in the example shown in FIG. The first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44 may be in contact with either the first inner wall surface 11a or the second inner wall surface 12a, and may be in contact with either one of the first inner wall surface 11a and the second inner wall surface 12a. It does not have to be in contact with the wall surface 11a and the second inner wall surface 12a.

The first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44 are composed of, for example, a metal porous body, a ceramic porous body, or a resin porous body. Even if the first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44 are composed of a sintered body such as a metal porous sintered body or a ceramic porous sintered body, for example. good. The first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44 are preferably composed of a metal porous sintered body of copper or nickel. The materials constituting the first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44 may be the same or different, but are preferably the same.

As shown in FIG. 2, the first porous body 41 extends along a direction perpendicular to the thickness direction Z (in the present embodiment, the length direction Y). As shown in FIGS. 2 and 4, the first porous body 41 is divided in the extending direction via the first dividing region R1.

As shown in FIG. 2, the third porous body 43 extends along the direction in which the first porous body 41 extends (in the present embodiment, the length direction Y). As shown in FIG. 2, the third porous body 43 is divided through the second divided region R2 in the extending direction thereof.

As shown in FIG. 2, a steam flow path 50 through which a gas phase operating medium 20 flows is formed between adjacent wicks 30.

On the other hand, in each wick 30, the first porous body 41 and the third porous body 43 extend between the first porous body 41 and the third porous body 43 (in the present embodiment, the length direction Y). The liquid flow path 51 is formed by providing an interval along the line. The liquid flow path 51 can be used as a liquid flow path through which the working medium 20 of the liquid phase flows. By alternately arranging the vapor flow path 50 and the liquid flow path 51 with the first porous body 41 or the third porous body 43 interposed therebetween, the heat transport efficiency can be improved.

The width of the steam flow path 50 is larger than the width of the liquid flow path 51. The width of the steam flow path 50 is preferably 1000 μm or more and 3000 μm or less, and more preferably 1000 μm or more and 2000 μm or less. The width of the liquid flow path 51 is preferably 50 μm or more and 500 μm or less. In the above cross section, when the width of the steam flow path 50 is different in the thickness direction Z, the width of the widest portion is defined as the width of the steam flow path 50. Similarly, when the width of the liquid flow path 51 is different in the thickness direction Z, the width of the widest portion is defined as the width of the liquid flow path 51.

As shown in FIGS. 2 and 4, the second porous body 42 is arranged with a gap from the first porous body 41 so as to fit in the first divided region R1.

As shown in FIG. 2, the fourth porous body 44 is arranged with a gap from the third porous body 43 so as to fit in the second divided region R2.

In the vapor chamber 1, the housing 10 can be bent at a bending line L (see FIG. 2) connecting a set of adjacent first dividing regions R1 and second dividing regions R2.

FIG. 5 is a cross-sectional view schematically showing a bent state of the vapor chamber shown in FIG.

As shown in FIG. 5, when the housing 10 is bent with the bending line L located in the first dividing region R1 as a boundary, the first porous body 41 does not exist in the portion that becomes the starting point of the bending, so that the bending is performed. No stress is applied to the first porous body 41. Therefore, it is possible to prevent coarse defects such as cracks that occur in the first porous body 41.

On the other hand, if the first porous body 41 is divided, the capillary force of the wick 30 decreases. Therefore, by arranging the second porous body 42 so as to fit in the first divided region R1, the capillary force of the wick 30 can be maintained. Further, by arranging the second porous body 42, the steam flow path 50 is less likely to be crushed when the housing 10 is bent, so that high heat equalization can be maintained.

Although not shown, similarly to the above, when the housing 10 is bent with respect to the bending line L located in the second dividing region R2, it is possible to prevent coarse defects such as cracks generated in the third porous body 43. can. Further, by arranging the fourth porous body 44 so as to fit in the second divided region R2, the capillary force of the wick 30 can be maintained. Further, by arranging the fourth porous body 44, the steam flow path 50 is less likely to be crushed when the housing 10 is bent, so that high heat equalization can be maintained.

As described above, in the vapor chamber 1, since the wick 30 includes the first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44, when the housing 10 is bent. , The capillary force of the wick 30 is maintained, and high heat transport capacity is maintained.

As shown in FIG. 2, looking at the cross section perpendicular to the thickness direction Z, the dimension of the porous body in the direction orthogonal to the direction in which the first porous body 41 extends (the width direction X in the present embodiment) is defined as the width. When, the width of the second porous body 42 may be the same as the width of the first porous body 41, may be smaller than the width of the first porous body 41, but may be larger than the width of the first porous body 41. preferable. In this case, since the width of the wick 30 at the starting point of bending is larger than the width of the surrounding wick 30, the steam flow path 50 is less likely to be crushed when the housing 10 is bent.

When the width of the second porous body 42 is larger than the width of the first porous body 41, the width of the second porous body 42 is preferably 120% or more and 300% or less of the width of the first porous body 41.

For the same reason, the width of the fourth porous body 44 may be the same as the width of the third porous body 43, may be smaller than the width of the third porous body 43, but may be smaller than the width of the third porous body 43. Larger is preferred. Further, the width of the fourth porous body 44 may be the same as or different from the width of the second porous body 42.

When the width of the 4th porous body 44 is larger than the width of the 3rd porous body 43, the width of the 4th porous body 44 is preferably 120% or more and 300% or less of the width of the 3rd porous body 43.

From the viewpoint of maintaining the capillary force of the wick 30, as shown in FIG. 5, when the cross section of the first porous body 41 along the extending direction and the thickness direction Z is viewed, the housing 10 is in a bent state. The distance between the first porous body 41 and the second porous body 42 sandwiching the bending line L is preferably 0 mm or more and 0.1 mm or less, and more preferably 0 mm or more and 0.05 mm or less. As described above, the distance between the first porous body 41 sandwiching the bending line L and the second porous body 42 may be 0 mm, that is, the first porous body 41 and the second porous body 42 sandwiching the bending line L may be separated from each other. It may be in contact.

For the same reason, when the cross section along the extending direction and the thickness direction Z of the third porous body 43 is viewed, the third porous body 43 and the third porous body 43 sandwiching the bending line L are in a bent state. The distance from the 4 porous body 44 is preferably 0 mm or more and 0.1 mm or less, and more preferably 0 mm or more and 0.05 mm or less. As described above, the distance between the third porous body 43 sandwiching the bending line L and the fourth porous body 44 may be 0 mm, that is, the third porous body 43 and the fourth porous body 44 sandwiching the bending line L may be separated from each other. It may be in contact. The distance between the third porous body 43 and the fourth porous body 44 sandwiching the bending line L may be the same as or different from the distance between the first porous body 41 and the second porous body 42 sandwiching the bending line L. good.

The distance between the first porous body 41 and the second porous body 42 sandwiching the bending line L means the distance of the widest portion in the above cross section. The same applies to the distance between the third porous body 43 and the fourth porous body 44 sandwiching the bending line L.

The shape of the second porous body 42 arranged in the first divided region R1 may be different from the shape of the fourth porous body 44 arranged in the second divided region R2, but it is preferable that the shape is the same.

The shape of the second porous body 42 is not particularly limited as long as the second porous body 42 is arranged with a gap from the first porous body 41 so as to fit in the first divided region R1, but as shown in FIG. When looking at the cross section along the direction in which the first porous body 41 extends and the thickness direction Z, it is preferable that the second porous body 42 has one or more acute angles. In this case, the acute angle of the second porous body 42 can be used to adjust the bending angle of the housing 10. Specifically, it is preferable that the housing 10 is bent so that the outer wall surface corresponding to the inner wall surface of the housing 10 that is not in contact with the acute angle is inside.

On the other hand, when looking at the cross section along the direction orthogonal to the extending direction of the first porous body 41 and the thickness direction Z, the second porous body 42 may have one or more acute angles, and has an acute angle. It does not have to be. For example, the cross-sectional shape of the second porous body 42 may be rectangular or the like.

In the example shown in FIG. 4, the cross-sectional shape of the second porous body 42 is a trapezoid having two acute angles. In the present embodiment, the acute angles of the second porous body 42 are both in contact with the first inner wall surface 11a of the housing 10. Therefore, as shown in FIG. 5, the outer wall surface corresponding to the second inner wall surface 12a of the housing 10 that is not in contact with the acute angle of the second porous body 42, that is, the outer wall surface of the second sheet 12 is on the inner side. The housing 10 is bent.

As shown in FIG. 4, when the cross section of the first porous body 41 along the extending direction and the thickness direction Z is viewed, the second porous body 42 has one or more acute angles and the housing 10 is bent. In the folded state, the housing 10 in which the second porous body 42 closest to the first porous body 41 is arranged with respect to the outer wall surface of the housing 10 in which the first porous body 41 closest to the bending line L is arranged. The relationship between the bending angle θ ₁ of the outer wall surface (see FIG. 5) and the acute angle angle α ₂ (see FIG. 4) of the second porous body 42 satisfies 0 ° <θ ₁ ≤ 90 ° − α ₂ . Is preferable.

FIG. 6 is a modification of FIG.
As shown in FIG. 6, when the second porous body 42 has two acute angles, the housing 10 may be bent in two steps. In FIG. 6, the housing 10 is bent with the bending lines L1 and L2 as boundaries.

FIG. 7 is a modification of FIG. 4.
In the vapor chamber 1A shown in FIG. 7, the cross-sectional shape of the second porous body 42A is a trapezoid having one acute angle.

When the second porous body 42 has one or more acute angles in the cross section along the extending direction and the thickness direction Z of the first porous body 41, the cross-sectional shape of the second porous body 42 may be a shape other than a trapezoid. Further, in the above-mentioned cross section, the second porous body 42 does not have to have an acute angle, and for example, the cross-sectional shape of the second porous body 42 may be a rectangle or the like.

The shape of the fourth porous body 44 is not particularly limited as long as the fourth porous body 44 is arranged with a gap from the third porous body 43 so as to fit in the second divided region R2. Similarly, when looking at the cross section along the direction in which the third porous body 43 extends and the thickness direction Z, it is preferable that the fourth porous body 44 has one or more acute angles. In this case, the acute angle of the fourth porous body 44 can be used to adjust the bending angle of the housing 10.

On the other hand, when looking at the cross section along the direction orthogonal to the extending direction of the third porous body 43 and the thickness direction Z, the fourth porous body 44 may have one or more acute angles, and has an acute angle. It does not have to be. For example, the cross-sectional shape of the fourth porous body 44 may be rectangular or the like.

Similar to the example shown in FIG. 2, when the cross section of the third porous body 43 along the extending direction and the thickness direction Z is viewed, the fourth porous body 44 has one or more acute angles and the housing 10 In the bent state, the housing in which the fourth porous body 44 closest to the third porous body 43 is arranged with respect to the outer wall surface of the housing 10 in which the third porous body 43 closest to the bending line L is arranged. The relationship between the bending angle θ ₃ (not shown) of the outer wall surface of 10 and the acute angle angle α ₄ (not shown) of the fourth porous body 44 is 0 ° <θ ₃ ≤ 90 ° −α ₄ . It is preferable to meet. The angle θ ₃ is preferably the same as the angle θ ₁ , and the angle α ₄ is preferably the same as the angle α ₂ .

When the fourth porous body 44 has two acute angles in the cross section along the extending direction and the thickness direction Z of the third porous body 43, the housing 10 may be bent in two steps.

When the fourth porous body 44 has one or more acute angles in the cross section along the extending direction and the thickness direction Z of the third porous body 43, the cross-sectional shape of the fourth porous body 44 may be a shape other than a trapezoid. Further, in the above cross section, the fourth porous body 44 does not have to have an acute angle, and for example, the cross-sectional shape of the fourth porous body 44 may be a rectangle or the like.

When looking at the cross section along the direction in which the first porous body 41 extends and the thickness direction Z, instead of the second porous body 42 having one or more acute angles, or the second porous body 42 has an acute angle of 1. In addition to having one or more points, the first porous body 41 may have one or more acute angles. In this case, the acute angle of the first porous body 41 can be used to adjust the bending angle of the housing 10.

On the other hand, when looking at the cross section along the direction orthogonal to the extending direction of the first porous body 41 and the thickness direction Z, the first porous body 41 may have one or more acute angles, and has an acute angle. It does not have to be. For example, the cross-sectional shape of the first porous body 41 may be rectangular or the like.

When the cross section along the extending direction and the thickness direction Z of the first porous body 41 is viewed, the bending line is in a state where the first porous body 41 has one or more acute angles and the housing 10 is bent. Bending angle θ ₁ of the outer wall surface of the housing 10 in which the second porous body 42 closest to the first porous body 41 is arranged with respect to the outer wall surface of the housing 10 in which the first porous body 41 closest to L is arranged. It is preferable that the relationship between (see FIG. 5) and the acute angle angle α ₁ (not shown) of the first porous body 41 satisfies 0 ° <θ ₁ ≤ 90 ° − α ₁ .

When the cross section along the extending direction and the thickness direction Z of the first porous body 41 is viewed, the first porous body 41 has one or more acute angles, and the second porous body 42 has one or more acute angles. In addition, when the housing 10 is bent, the second porous body 42 closest to the first porous body 41 is attached to the outer wall surface of the housing 10 in which the first porous body 41 closest to the bending line L is arranged. The bending angle θ ₁ (see FIG. 5) of the outer wall surface of the arranged housing 10, the acute angle angle α ₁ (not shown) of the first porous body 41, and the acute angle angle of the second porous body 42. It is preferable that the relationship with α ₂ (see FIG. 4) satisfies 0 ° <θ ₁ ≦ 90 ° − α ₁ − α ₂ . The angle α ₂ may be the same as or different from the angle α ₁ .

When the first porous body 41 has two acute angles in the cross section along the extending direction and the thickness direction Z of the first porous body 41, the housing 10 may be bent in two steps.

When the first porous body 41 has one or more acute angles in the cross section along the extending direction and the thickness direction Z of the first porous body 41, the cross-sectional shape of the first porous body 41 may be a shape other than a trapezoid. Further, in the above-mentioned cross section, the first porous body 41 does not have to have an acute angle, and for example, the cross-sectional shape of the first porous body 41 may be a rectangle or the like.

When looking at the cross section along the direction in which the third porous body 43 extends and the thickness direction Z, instead of the fourth porous body 44 having one or more acute angles, or the fourth porous body 44 has an acute angle of 1. In addition to having one or more points, the third porous body 43 may have one or more acute angles. In this case, the acute angle of the third porous body 43 can be used to adjust the bending angle of the housing 10.

On the other hand, when looking at the cross section along the direction orthogonal to the extending direction of the third porous body 43 and the thickness direction Z, the third porous body 43 may have one or more acute angles, and has an acute angle. It does not have to be. For example, the cross-sectional shape of the third porous body 43 may be rectangular or the like.

When the cross section along the extending direction and the thickness direction Z of the third porous body 43 is viewed, the bending line is in a state where the third porous body 43 has one or more acute angles and the housing 10 is bent. Bending angle θ ₃ of the outer wall surface of the housing 10 in which the fourth porous body 44 closest to the third porous body 43 is arranged with respect to the outer wall surface of the housing 10 in which the third porous body 43 closest to L is arranged. It is preferable that the relationship between (not shown) and the acute angle angle α ₃ (not shown) of the third porous body 43 satisfies 0 ° <θ ₃ ≤ 90 ° −α ₃ . The angle θ ₃ is preferably the same as the angle θ ₁ , and the angle α ₃ is preferably the same as the angle α ₁ .

When the cross section along the extending direction and the thickness direction Z of the third porous body 43 is viewed, the third porous body 43 has one or more acute angles, and the fourth porous body 44 has one or more acute angles. Further, in a state where the housing 10 is bent, the fourth porous body 44 closest to the third porous body 43 is attached to the outer wall surface of the housing 10 in which the third porous body 43 closest to the bending line L is arranged. The bending angle θ ₃ (not shown) of the outer wall surface of the arranged housing 10, the acute angle angle α ₃ (not shown) of the third porous body 43, and the acute angle angle of the fourth porous body 44. It is preferable that the relationship with α ₄ (not shown) satisfies 0 ° <θ ₃ ≤ 90 ° − α ₃ − α ₄ . The angle α ₄ may be the same as or different from the angle α ₃ . The angle θ ₃ is preferably the same as the angle θ ₁ , the angle α ₃ is preferably the same as the angle α ₁ , and the angle α ₄ is preferably the same as the angle α ₂ .

When the third porous body 43 has two acute angles in the cross section along the extending direction and the thickness direction Z of the third porous body 43, the housing 10 may be bent in two steps.

When the third porous body 43 has one or more acute angles in the cross section along the extending direction and the thickness direction Z of the third porous body 43, the cross-sectional shape of the third porous body 43 may be a shape other than a trapezoid. Further, in the above-mentioned cross section, the third porous body 43 does not have to have an acute angle, and for example, the cross-sectional shape of the third porous body 43 may be a rectangle or the like.

When looking at the cross section along the direction in which the first porous body 41 extends and the thickness direction Z, the housing 10 in which the first porous body 41 closest to the bending line L is arranged in a state where the housing 10 is bent. The bending angle θ ₁ of the outer wall surface of the housing 10 in which the second porous body 42 closest to the first porous body 41 is arranged with respect to the outer wall surface of the housing 10 is preferably 10 ° or more and 45 ° or less, preferably 10 °. It is more preferably 30 ° or less.

When the cross section of the third porous body 43 along the extending direction and the thickness direction Z is viewed, the housing 10 in which the third porous body 43 closest to the bending line L is arranged in the bent state of the housing 10. The bending angle θ ₃ of the outer wall surface of the housing 10 in which the fourth porous body 44 closest to the third porous body 43 is arranged with respect to the outer wall surface of the housing 10 is preferably 10 ° or more and 45 ° or less, preferably 10 °. It is more preferably 30 ° or less. The angle θ ₃ is preferably the same as the angle θ ₁ .

As described above, when looking at the cross section perpendicular to the thickness direction Z and defining the dimension of the porous body in the direction orthogonal to the direction in which the first porous body 41 extends as the width, the width of the first porous body 41 and the third. The width of each of the porous bodies 43 is preferably 50 μm or more and 300 μm or less. This makes it possible to obtain a high capillary force. The width of the first porous body 41 may be the same as or different from the width of the third porous body 43. The width of the first porous body 41 and the width of the third porous body 43 may or may not be constant in the thickness direction Z. Further, a porous body having a constant width in the thickness direction Z and a porous body having a non-constant width in the thickness direction Z may coexist.

The width of the second porous body 42 and the width of the fourth porous body 44 are preferably 60 μm or more and 500 μm or less, respectively. The width of the second porous body 42 may be the same as or different from the width of the fourth porous body 44. The width of the second porous body 42 and the width of the fourth porous body 44 may or may not be constant in the thickness direction Z. Further, a porous body having a constant width in the thickness direction Z and a porous body having a non-constant width in the thickness direction Z may coexist.

The height of the first porous body 41 and the height of the third porous body 43 are preferably 20 μm or more and 300 μm or less, and more preferably 50 μm or more and 200 μm or less, respectively. The height of the first porous body 41 may be the same as or different from the height of the third porous body 43.

The height of the second porous body 42 and the height of the fourth porous body 44 are preferably 20 μm or more and 300 μm or less, and more preferably 50 μm or more and 200 μm or less, respectively. The height of the second porous body 42 may be the same as or different from the height of the fourth porous body 44. Further, the height of the second porous body 42 may be the same as or different from the height of the first porous body 41. Similarly, the height of the fourth porous body 44 may be the same as or different from the height of the third porous body 43.

Next, the operation of the vapor chamber 1 configured as described above will be described.

In the evaporation unit EP, the working medium 20 of the liquid phase located on the surfaces of the first porous body 41 and the third porous body 43 is heated and evaporated through the inner wall surface of the housing 10. As the working medium 20 evaporates, the pressure of the gas in the steam flow path 50 in the vicinity of the evaporation unit EP increases. As a result, the working medium 20 of the gas phase moves in the steam flow path 50 toward the condensed portion CP side.

The gas phase working medium 20 that has reached the condensing portion CP is deprived of heat through the inner wall surface of the housing 10 and is condensed into droplets. As described above, the working medium 20 of the gas phase can be condensed other than the condensed portion CP. The droplets of the working medium 20 permeate into the pores of the first porous body 41 and the pores of the third porous body 43 by the capillary force. Further, a part of the working medium 20 of the liquid phase that has penetrated into the pores of the first porous body 41 and the pores of the third porous body 43 flows into the liquid flow path 51. Therefore, the liquid flow path is formed by the first porous body 41, the third porous body 43, and the liquid flow path 51.

The working medium 20 of the liquid phase in the pores of the first porous body 41, in the pores of the third porous body 43, and in the liquid flow path 51 moves to the evaporation part EP side by the capillary force. On the way, in the first divided region R1 where the first porous body 41 was divided, the working medium 20 of the liquid phase passed from the first porous body 41 on the CP side of the condensed portion to the second porous body 42 by the capillary force. It moves to the first porous body 41 on the EP side of the evaporation part. Similarly, in the second divided region R2 in which the third porous body 43 is divided, the working medium 20 of the liquid phase passes through the third porous body 43 to the fourth porous body 44 on the CP side of the condensing portion by the capillary force. , Moves to the third porous body 43 on the EP side of the evaporation part. Then, the working medium 20 of the liquid phase is supplied from the pores of the first porous body 41, the pores of the third porous body 43, and the liquid flow path 51 to the evaporation section EP. The working medium 20 of the liquid phase that has reached the evaporation unit EP evaporates again from the surfaces of the first porous body 41 and the third porous body 43 in the evaporation unit EP.

As shown in FIG. 2, it is preferable that the liquid flow path 51 reaches the evaporation unit EP. The evaporating unit EP may include the liquid flow path 51 and the wick 30, or may include only the wick 30 without the liquid flow path 51, or may include the liquid flow path 51 and the wick 30. It does not have to be.

Further, it is preferable that the bending line L is not arranged in the evaporation portion EP. That is, it is preferable that the second porous body 42 and the fourth porous body 44 are not arranged in the evaporation unit EP.

The working medium 20 that has evaporated and becomes a gas phase moves to the condensed portion CP side again through the steam flow path 50. In this way, the vapor chamber 1 can repeatedly transport the heat recovered on the evaporation unit EP side to the condensation unit CP side by repeatedly utilizing the gas-liquid phase change of the working medium 20.

The pore diameters of the first porous body 41 and the third porous body 43 are preferably 50 μm or less, respectively. By reducing the pore diameter, high capillary force can be obtained. The pore diameters of the first porous body 41 and the third porous body 43 may be the same or different. The shape of the hole is not particularly limited.

The pore diameters of the second porous body 42 and the fourth porous body 44 are preferably 50 μm or less, respectively. By reducing the pore diameter, high capillary force can be obtained. The pore diameters of the second porous body 42 and the fourth porous body 44 may be the same or different. Further, the pore diameter of the second porous body 42 may be the same as or different from the pore diameter of the first porous body 41. Similarly, the pore diameter of the fourth porous body 44 may be the same as or different from the pore diameter of the third porous body 43. The shape of the hole is not particularly limited.

As shown in FIG. 2, the ends of at least one set of adjacent wicks 30 on the EP side of the evaporation portion may be connected to each other, and the liquid flow paths 51 may communicate with each other. Further, at least one set of adjacent wicks 30 may be connected to each other at the ends opposite to the evaporation portion EP, for example, the ends on the condensing portion CP side, and the liquid flow paths 51 may communicate with each other.

As described above, in the vapor chamber 1, the vapor flow path 50 and the liquid flow path 51 are formed between the wicks 30. Above all, as shown in FIG. 2, it is preferable that the density of the flow path in the evaporation part EP is higher than the density of the flow path in the portion away from the evaporation part EP, for example, the density of the flow path in the condensation part CP. Thereby, the maximum heat transport amount can be improved.

The vapor chamber 1 is manufactured by, for example, the following method. In the following example, the first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44 are composed of a metal porous sintered body such as copper. The method for manufacturing the vapor chamber 1 is not particularly limited as long as the above configuration can be obtained.

First, of the surface of the first sheet 11, the surface to be the first inner wall surface 11a is coated with a metal paste such as a copper paste for forming the first porous body 41 and the third porous body 43. Examples of the method of applying the metal paste include printing such as screen printing.

By heating the first sheet 11 coated with the metal paste, the metal paste becomes a metal porous sintered body. As a result, the first porous body 41 and the third porous body 43 are formed on the first sheet 11.

FIG. 8 is a plan view schematically showing an example of the first porous body and the third porous body formed on the first sheet. FIG. 9 is a cross-sectional view of the first porous body as seen from the direction indicated by the arrow IX in FIG. FIG. 10 is a cross-sectional view of the first porous body seen from the direction indicated by the arrow X in FIG.

In the example shown in FIG. 8, the metal paste is applied onto the first sheet 11 along the length direction Y by a method such as printing. As a result, the first porous body 41 and the third porous body 43 are formed on the first sheet 11 along the length direction Y. The first divided region R1 is formed in the first porous body 41, and the second divided region R2 is formed in the third porous body 43. As shown in FIG. 9, in the cross section viewed from the direction perpendicular to the application direction of the metal paste, the cross-sectional shape of the first porous body 41 is rectangular. Similarly, the cross-sectional shape of the third porous body 43 is also rectangular. On the other hand, as shown in FIG. 10, in the cross section viewed from the direction parallel to the coating direction of the metal paste, the cross-sectional shape of the first porous body 41 is trapezoidal. Similarly, the cross-sectional shape of the third porous body 43 is also trapezoidal.

Separately, of the surface of the second sheet 12, a metal paste such as a copper paste for forming the second porous body 42 and the fourth porous body 44 is applied to the surface to be the second inner wall surface 12a. Examples of the method of applying the metal paste include printing such as screen printing. The metal paste for forming the second porous body 42 and the fourth porous body 44 may be the same as or different from the metal paste for forming the first porous body 41 and the third porous body 43.

By heating the second sheet 12 coated with the metal paste, the metal paste becomes a metal porous sintered body. As a result, the second porous body 42 and the fourth porous body 44 are formed on the second sheet 12.

FIG. 11 is a plan view schematically showing an example of the second porous body and the fourth porous body formed on the second sheet. FIG. 12 is a cross-sectional view of the second porous body as seen from the direction indicated by the arrow XII in FIG. FIG. 13 is a cross-sectional view of the second porous body as seen from the direction indicated by the arrow XIII in FIG.

In the example shown in FIG. 11, the metal paste is applied onto the second sheet 12 along the width direction X by a method such as printing. As a result, the second porous body 42 and the fourth porous body 44 are formed on the second sheet 12 along the width direction X. As shown in FIG. 12, the cross-sectional shape of the second porous body 42 is trapezoidal in the cross-sectional view seen from the direction parallel to the application direction of the metal paste. Similarly, the cross-sectional shape of the fourth porous body 44 is also trapezoidal. On the other hand, as shown in FIG. 13, the cross-sectional shape of the second porous body 42 is rectangular in the cross section viewed from the direction perpendicular to the application direction of the metal paste. Similarly, the cross-sectional shape of the fourth porous body 44 is also rectangular.

The order in which the first sheet 11 and the second sheet 12 are heated is not particularly limited, and may be, for example, after the first sheet 11 and the second sheet 12 are joined.

After that, the first sheet 11 is fitted so that the second porous body 42 is fitted in the first divided region R1 of the first porous body 41 and the fourth porous body 44 is fitted in the second divided region R2 of the third porous body 43. And the second sheet 12 are overlapped with each other, and the outer edge portion is joined. At this time, an encapsulation port for encapsulating the working medium 20 of the liquid phase is formed. As a result, the housing 10 having an internal space is manufactured.

After injecting the working medium 20 of the liquid phase from the encapsulation port of the housing 10, the encapsulation port is closed.

The vapor chamber 1 is manufactured through the above steps.

The vapor chamber 1 may be manufactured by a method other than the above. For example, the direction of applying the metal paste for forming the second porous body 42 and the fourth porous body 44 is the same as the direction of applying the metal paste for forming the first porous body 41 and the third porous body 43. But it may be. Further, the metal paste for forming the first porous body 41 and the third porous body 43 is applied onto the first sheet 11, and the metal paste for forming the second porous body 42 and the fourth porous body 44 is also the first. It may be applied on 1 sheet 11. Alternatively, the metal paste for forming the first porous body 41 and the third porous body 43 is applied onto the second sheet 12, and the metal paste for forming the second porous body 42 and the fourth porous body 44 is also the first. 2 It may be applied on the sheet 12.

[Second Embodiment]
In the vapor chamber according to the second embodiment of the present invention, a plurality of second porous bodies are arranged in the direction in which the first porous body extends in the first divided region, and the third porous body is arranged in the second divided region. A plurality of fourth porous bodies are arranged in the extending direction.

FIG. 14 is a cross-sectional view schematically showing an example of a vapor chamber according to a second embodiment of the present invention.

In the vapor chamber 2 shown in FIG. 14, a plurality of second porous bodies 42 are arranged in the first divided region R1 in the direction in which the first porous body 41 extends. Although not shown, a plurality of fourth porous bodies 44 are arranged in the second divided region R2 in the direction in which the third porous body 43 extends. In the example shown in FIG. 14, five second porous bodies 42 are arranged in the first divided region R1, but if two or more second porous bodies 42 are arranged in the first divided region R1. good. Similarly, two or more fourth porous bodies 44 may be arranged in the second divided region R2.

A plurality of second porous bodies 42 are arranged in the first divided region R1, and a plurality of fourth porous bodies 44 are arranged in the second divided region R2, whereby the second porous body 42 or the fourth porous body 44 is arranged. The housing 10 can be bent at the place where the housing 10 is arranged. Therefore, the housing 10 can be bent at an angle larger than the bending angles θ ₁ and θ ₃ described in the first embodiment.

The number of the second porous bodies 42 arranged in the first divided region R1 may be different from the number of the fourth porous bodies 44 arranged in the second divided region R2, but it is preferable that they are the same. The shape of the second porous body 42 arranged in the first divided region R1 may be different from the shape of the fourth porous body 44 arranged in the second divided region R2, but is preferably the same.

The shape of the second porous body 42 may be the same or different in the cross section along the direction in which the first porous body 41 extends and the thickness direction Z. Similarly, in the cross section along the direction in which the third porous body 43 extends and the thickness direction Z, the shape of the fourth porous body 44 may be the same or different.

[Third Embodiment]
In the vapor chamber according to the third embodiment of the present invention, the first porous body has a plurality of first divided regions, and the third porous body has a plurality of second divided regions. Of the bending lines connecting one set of adjacent first and second dividing regions, the orientation of the housing that can be bent with at least one bending line as the boundary is the orientation of the housing that can be bent with another bending line as the boundary. It is the same as the orientation.

FIG. 15 is a cross-sectional view schematically showing an example of a vapor chamber according to a third embodiment of the present invention.

In the vapor chamber 3 shown in FIG. 15, the first porous body 41 has a plurality of first divided regions R1. Although not shown, the third porous body 43 has a plurality of second divided regions R2. In the example shown in FIG. 15, the first porous body 41 has two first divided regions R1, but may have three or more first divided regions R1. Similarly, the third porous body 43 may have two second divided regions R2, or may have three or more second divided regions R2.

Of the bending lines L1 and L2 connecting one set of adjacent first dividing regions R1 and the second dividing region R2, the direction of the housing 10 that can be bent with one bending line L1 as a boundary is different from the bending line L2. It is the same as the orientation of the housing 10 that can be bent at the boundary.

Since the first porous body 41 has a plurality of first divided regions R1 and the third porous body 43 has a plurality of second divided regions R2, the bent portion and the straight portion can be combined. Therefore, the housing 10 can be bent according to the shape of the space.

When the first porous body 41 has three or more first divided regions R1 and the third porous body 43 has three or more second divided regions R2, a set of adjacent first divided regions R1 and a first. If the orientation of the housing 10 that can be bent with at least one bending line L1 as the boundary among the bending lines connecting the two divided regions R2 is the same as the orientation of the housing 10 that can be bent with another bending line L2 as the boundary. good.

The number of the first divided regions of the first porous body 41 may be different from the number of the second divided regions R2 of the third porous body 43, but is preferably the same.

The number of the second porous bodies 42 arranged in each of the first divided regions R1 may be the same or different. Similarly, the number of the fourth porous bodies 44 arranged in each of the second divided regions R2 may be the same or different.

[Fourth Embodiment]
In the vapor chamber according to the fourth embodiment of the present invention, the first porous body has a plurality of first divided regions, and the third porous body has a plurality of second divided regions. Of the bending lines connecting one set of adjacent first and second dividing regions, the orientation of the housing that can be bent with at least one bending line as the boundary is the orientation of the housing that can be bent with another bending line as the boundary. The orientation is different.

FIG. 16 is a cross-sectional view schematically showing an example of a vapor chamber according to a fourth embodiment of the present invention.

In the vapor chamber 4 shown in FIG. 16, the first porous body 41 has a plurality of first divided regions R1. Although not shown, the third porous body 43 has a plurality of second divided regions R2. In the example shown in FIG. 16, the first porous body 41 has two first divided regions R1, but may have three or more first divided regions R1. Similarly, the third porous body 43 may have two second divided regions R2, or may have three or more second divided regions R2.

Of the bending lines L1 and L2 connecting one set of adjacent first dividing regions R1 and the second dividing region R2, the direction of the housing 10 that can be bent with one bending line L1 as a boundary is different from the bending line L2. It is different from the orientation of the housing 10 that can be bent at the boundary.

Since the first porous body 41 has a plurality of first divided regions R1 and the third porous body 43 has a plurality of second divided regions R2, the bent portion and the straight portion can be combined. Therefore, as in the third embodiment, the housing 10 can be bent according to the shape of the space.

When the first porous body 41 has three or more first divided regions R1 and the third porous body 43 has three or more second divided regions R2, a set of adjacent first divided regions R1 and a first. If the orientation of the housing 10 that can be bent with at least one bending line L1 as a boundary among the bending lines connecting the two divided regions R2 is different from the orientation of the housing 10 that can be bent with another bending line L2 as a boundary. good.

The number of the first divided regions of the first porous body 41 may be different from the number of the second divided regions R2 of the third porous body 43, but is preferably the same.

The number of the second porous bodies 42 arranged in each of the first divided regions R1 may be the same or different. Similarly, the number of the fourth porous bodies 44 arranged in each of the second divided regions R2 may be the same or different.

[Fifth Embodiment]
In the vapor chamber according to the fifth embodiment of the present invention, when a cross section perpendicular to the thickness direction is viewed, the bending line connecting one set of adjacent first division regions and second division regions is the contour line of the housing. Is tilted against.

FIG. 17 is a cross-sectional view schematically showing an example of a vapor chamber according to a fifth embodiment of the present invention.

In the vapor chamber 5 shown in FIG. 17, when the cross section perpendicular to the thickness direction Z is viewed, the bending line L connecting the pair of adjacent first dividing regions R1 and the second dividing region R2 is the contour of the housing 10. It is inclined with respect to the line.

Since the bending line L connecting one set of adjacent first dividing regions R1 and the second dividing region R2 is inclined with respect to the contour line of the housing 10, the housing 10 is bent according to the shape of the space. Can be done.

[Sixth Embodiment]
The sixth embodiment is different from the first to fifth embodiments in that the wick contains the first porous body and the second porous body, and does not include the third porous body and the fourth porous body.

FIG. 18 is a cross-sectional view schematically showing an example of a vapor chamber according to a sixth embodiment of the present invention. FIG. 19 is a cross-sectional view taken along the line XIX-XIX of the vapor chamber shown in FIG.

In the vapor chamber 6 shown in FIG. 18, the wick 30A includes the first porous body 41 and the second porous body 42. Unlike the vapor chamber 1 shown in FIG. 2, the wick 30A does not include the third porous body 43 and the fourth porous body 44. Therefore, in the vapor chamber 6, the liquid flow path 51 is not formed, but the liquid flow path is formed by the first porous body 41 and the second porous body 42.

As shown in FIG. 18, the first porous body 41 extends along a direction perpendicular to the thickness direction Z (in the present embodiment, the length direction Y). As shown in FIG. 18, the first porous body 41 is divided through the first divided region R1 in the extending direction thereof.

As shown in FIGS. 18 and 19, a steam flow path 50 is formed between adjacent wicks 30.

As shown in FIG. 18, the second porous body 42 is arranged with a gap from the first porous body 41 so as to fit in the first divided region R1.

In the vapor chamber 6, the housing 10 can be bent with a bending line L (see FIG. 18) including the first dividing region R1 as a boundary.

As described above, the vapor chamber 6 in which the wick 30A does not include the third porous body 43 and the fourth porous body 44 but includes the first porous body 41 and the second porous body 42 is similar to the vapor chamber 1. The effect can be expected.

The vapor chamber according to the sixth embodiment of the present invention has the same configuration as the first embodiment of the present invention except that the wick does not contain the third porous body and the fourth porous body.

In the vapor chamber according to the sixth embodiment of the present invention, as in the second embodiment of the present invention, a plurality of second porous bodies are arranged in the first divided region in the direction in which the first porous body extends. May be good.

In the vapor chamber according to the sixth embodiment of the present invention, as in the third embodiment of the present invention, the first porous body has a plurality of first dividing regions, and a bending line including each first dividing region. Of these, the orientation of the housing that can be bent with at least one bending line as a boundary may be the same as the orientation of the housing that can be bent with another bending line as a boundary.

In the vapor chamber according to the sixth embodiment of the present invention, as in the fourth embodiment of the present invention, the first porous body has a plurality of first dividing regions, and a bending line including each first dividing region. Of these, the orientation of the housing that can be bent with at least one bending line as a boundary may be different from the orientation of the housing that can be bent with another bending line as a boundary.

In the vapor chamber according to the sixth embodiment of the present invention, as in the fifth embodiment of the present invention, when the cross section perpendicular to the thickness direction is viewed, the bending line including the first dividing region is the contour of the housing. It may be inclined with respect to the line.

[Other embodiments]
The heat diffusion device of the present invention is not limited to the above embodiment, and various applications and modifications can be added within the scope of the present invention regarding the configuration of the heat diffusion device, manufacturing conditions, and the like.

In the heat diffusion device of the present invention, the planar shape of the housing 10 when viewed from the thickness direction Z is not particularly limited, and examples thereof include polygons such as triangles and rectangles, circles, ellipses, and combinations thereof. Be done. Further, the planar shape of the housing 10 may be L-shaped, C-shaped (U-shaped), or the like. Further, a through hole may be provided inside the housing 10. The planar shape of the housing 10 may be a shape corresponding to the application of the heat diffusion device, the shape of the place where the heat diffusion device is incorporated, and other parts existing in the vicinity.

In the above embodiment, the wick 30 including the first porous body 41 and the second porous body 42 is arranged in the entire internal space of the housing 10 in a plan view of the housing 10 from the thickness direction Z. As shown, it may be placed locally. For example, in a plan view of the housing 10 from the thickness direction Z, the wick 30 may be arranged only along the edge of the internal space of the housing 10, or near the central portion of the housing 10 in the lateral direction. The wick 30 may be placed only in.

In the heat diffusion device of the present invention, when the housing 10 is composed of the first sheet 11 and the second sheet 12, the first sheet 11 and the second sheet 12 are overlapped so that their ends coincide with each other. Alternatively, the ends may be offset and overlapped.

In the heat diffusion device of the present invention, when the housing 10 is composed of the first sheet 11 and the second sheet 12, the material constituting the first sheet 11 and the material constituting the second sheet 12 are different. May be good. For example, by using a high-strength material for the first sheet 11, the stress applied to the housing 10 can be dispersed. Further, by using different materials for both, one sheet can obtain one function and the other sheet can obtain another function. The above-mentioned functions are not particularly limited, and examples thereof include a heat conduction function and an electromagnetic wave shielding function.

In the heat diffusion device of the present invention, in the cross section perpendicular to the direction in which the first porous body 41 extends, the width of the first porous body 41 may be constant in the thickness direction Z, and the width may be constant in the thickness direction Z. It does not have to be constant. For example, in the cross section perpendicular to the direction in which the first porous body 41 extends, the width of the end portion on the second inner wall surface 12a side of the first porous body 41 is narrower than the width of the end portion on the first inner wall surface 11a side. May be good. In this case, a portion having a constant width may be included.

In the heat diffusion device of the present invention, when the wick 30 includes the third porous body 43 and the fourth porous body 44, the third porous body 43 has a thickness in a cross section perpendicular to the direction in which the third porous body 43 extends. The width may be constant in the direction Z, and the width may not be constant in the thickness direction Z. For example, in the cross section perpendicular to the direction in which the third porous body 43 extends, the width of the end portion on the second inner wall surface 12a side of the third porous body 43 is narrower than the width of the end portion on the first inner wall surface 11a side. May be good. In this case, a portion having a constant width may be included.

In the heat diffusion device of the present invention, the housing 10 may have a plurality of evaporation units EP.

In the heat diffusion device of the present invention, unlike the vapor chamber 1 shown in FIG. 2, a wick 30 extending along an oblique direction with respect to the width direction X and the length direction Y may exist. For example, the wick 30 may extend radially from the evaporation unit EP.

In the heat diffusion device of the present invention, a plurality of columns that support the first inner wall surface 11a and the second inner wall surface 12a of the housing 10 from the inside may be arranged in the steam flow path 50.

When a plurality of columns are arranged in the steam flow path 50, the steam flow path 50 is divided between the columns. The columns support the first inner wall surface 11a and the second inner wall surface 12a of the housing 10 from the inside. When the number of liquid flow paths 51 is small, it is possible to support the housing 10 by arranging columns in the steam flow path 50.

When a plurality of columns are arranged in the steam flow path 50, it is preferable that the columns are arranged in all the steam flow paths 50, but there may be a steam flow path 50 in which the columns are not arranged.

The column may be in contact with both the first inner wall surface 11a and the second inner wall surface 12a, may be in contact with either the first inner wall surface 11a or the second inner wall surface 12a, and may be in contact with either one of the first inner wall surface 11a and the second inner wall surface 12a. And it does not have to be in contact with both the second inner wall surface 12a.

The material forming the column is not particularly limited, and examples thereof include resin, metal, ceramics, a mixture thereof, and a laminate. Further, the support column may be integrated with the housing 10, and may be formed by, for example, etching the inner wall surface of the first sheet 11 or the second sheet 12.

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

The height of the columns is not particularly limited, and may be the same as or different from the height of the wick 30.

The height of the columns may be the same or different in one heat diffusion device. For example, the height of the stanchions in one area may be different from the height of the stanchions in another area.

The width of the strut is not particularly limited as long as it gives strength that can suppress the deformation of the housing of the heat diffusion device, but the equivalent circle diameter of the cross section perpendicular to the height direction of the end of the strut is, for example, 100 μm or more and 2000 μm. It is less than or equal to, preferably 300 μm or more and 1000 μm or less. By increasing the diameter equivalent to the circle of the support column, it is possible to further suppress the deformation of the housing of the heat diffusion device. On the other hand, by reducing the diameter equivalent to the circle of the column, it is possible to secure a wider space for the steam of the working medium to move.

The arrangement of the columns is not particularly limited, but is preferably arranged evenly in a predetermined area, more preferably evenly over the entire area, for example, so that the distance between the columns is constant. By arranging the columns evenly, uniform strength can be ensured throughout the heat diffusion device.

The heat diffusion device of the present invention may further include a wick other than the first porous body 41, the second porous body 42, the third porous body 43, and the fourth porous body 44. For example, the heat diffusion device of the present invention may further include at least one of the wicks arranged along the first inner wall surface and the wicks arranged along the second inner wall surface.

The wick arranged along the first inner wall surface and the wick arranged along the second inner wall surface are not particularly limited as long as they have a capillary structure capable of moving the working medium by a capillary force. The capillary structure of the wick may be a known structure used in conventional heat diffusion devices. Examples of the capillary structure include microstructures having irregularities such as pores, grooves, and protrusions, such as a porous structure, a fiber structure, a groove structure, and a mesh structure.

The material of the wick arranged along the first inner wall surface and the material of the wick arranged along the second inner wall surface are not particularly limited, and for example, a metal porous film formed by etching or metal processing, a mesh, a non-woven fabric, and the like. A sintered body, a porous body, or the like is used. The mesh used as the material of the wick may be composed of, for example, a metal mesh, a resin mesh, or a surface-coated mesh thereof, and is preferably composed of a copper mesh, a stainless (SUS) mesh, or a polyester mesh. .. The sintered body used as the material of the wick may be composed of, for example, a metal porous sintered body and a ceramic porous sintered body, and is preferably composed of a copper or nickel porous sintered body. .. The porous body used as the material of the wick may be, for example, a porous body made of a metal porous body, a ceramic porous body, a resin porous body, or the like.

The size and shape of the wick arranged along the first inner wall surface and the wick arranged along the second inner wall surface are not particularly limited, but are, for example, continuous from the evaporation part to the condensing part inside the housing. It is preferable to have a size and a shape that can be installed.

The thickness of the wick arranged along the first inner wall surface and the thickness of the wick arranged along the second inner wall surface are not particularly limited, but are, for example, 2 μm or more and 200 μm or less, preferably 5 μm or more and 100 μm or less, respectively. More preferably, it is 10 μm or more and 40 μm or less. The thickness of the wicks arranged along the first inner wall surface and the wicks arranged along the second inner wall surface may be partially different. The thickness of the wick arranged along the first inner wall surface may be the same as or different from the thickness of the wick arranged along the second inner wall surface.

The heat diffusion device of the present invention can be mounted on an electronic device for the purpose of heat dissipation. Therefore, an electronic device provided with the heat diffusion device of the present invention is also one of the present inventions. Examples of the electronic device of the present invention include smartphones, tablet terminals, notebook computers, game devices, wearable devices and the like. As described above, the heat diffusion device of the present invention operates independently without the need for external power, and can diffuse heat in two dimensions at high speed by utilizing the latent heat of vaporization and the latent heat of condensation of the working medium. Therefore, the electronic device provided with the heat diffusion device of the present invention can effectively dissipate heat in the limited space inside the electronic device.

The heat diffusion device of the present invention can be used for a wide range of applications in the field of portable information terminals and the like. For example, it can be used to lower the temperature of a heat source such as a CPU and extend the usage time of an electronic device, and can be used for a smartphone, a tablet terminal, a notebook computer, or the like.

1, 1A, 2, 3, 4, 5, 6 Vapor chamber (heat diffusion device)
10 Housing 11 1st sheet 11a 1st inner wall surface 12 2nd sheet 12a 2nd inner wall surface 20 Working medium 30, 30A Wick 41 1st porous body 42, 42A 2nd porous body 43 3rd porous body 44 4th porous body 50 Steam flow path 51 Liquid flow path CP Condensing part EP Evaporation part HS Heat source L, L1, L2 Bending line R1 First dividing region R2 Second dividing region X Width direction Y Length direction Z Thickness direction α ₂ Second porous body Angle of sharp angle θ ₁ Bending angle of the outer wall surface of the housing in which the second porous body closest to the first porous body is arranged with respect to the outer wall surface of the housing in which the first porous body closest to the bending line is arranged.

Claims (14)

1. A housing having a first inner wall surface and a second inner wall surface facing each other in the thickness direction,
   The working medium enclosed in the internal space of the housing and
   With a wick arranged in the internal space of the housing,
   The wick includes a first porous body and a second porous body that support the first inner wall surface and the second inner wall surface of the housing from the inside.
   The first porous body extends along a direction perpendicular to the thickness direction, and is divided in the extending direction through the first dividing region.
   The second porous body is a heat diffusion device arranged with a gap from the first porous body so as to fit in the first divided region.
2. The wick further includes a third porous body and a fourth porous body that support the first inner wall surface and the second inner wall surface of the housing from the inside.
   The third porous body extends along the direction in which the first porous body extends, and is divided in the extending direction via the second dividing region.
   A liquid flow path is formed between the first porous body and the third porous body along the direction in which the first porous body and the third porous body extend.
   The heat diffusion device according to claim 1, wherein the fourth porous body is arranged with a gap from the third porous body so as to fit in the second divided region.
3. Looking at the cross section perpendicular to the thickness direction, when the dimension of the porous body in the direction orthogonal to the direction in which the first porous body extends is defined as the width, the width of the second porous body is the width of the first porous body. The heat diffusion device according to claim 1 or 2, which is larger than the width.
4. The heat diffusion according to any one of claims 1 to 3, wherein the second porous body has one or more acute angles when the cross section is viewed along the direction in which the first porous body extends and the thickness direction. device.
5. The heat diffusion according to any one of claims 1 to 4, wherein the first porous body has one or more acute angles when the cross section is viewed along the extending direction and the thickness direction of the first porous body. device.
6. The housing is bent at a bending line including the first dividing region.
   When the cross section along the extending direction and the thickness direction of the first porous body is viewed, the first porous body and the second porous body sandwiching the bending line are in a bent state. The heat diffusion device according to any one of claims 1 to 5, wherein the distance between the two is 0 mm or more and 0.1 mm or less.
7. The housing is bent at a bending line including the first dividing region.
   When the cross section along the extending direction and the thickness direction of the first porous body is viewed, the bending is performed in a state where the second porous body has one or more acute angles and the housing is bent. With respect to the outer wall surface of the housing in which the first porous body closest to the line is arranged, the bending angle θ ₁ of the outer wall surface of the housing in which the second porous body closest to the first porous body is arranged. The heat diffusion device according to any one of claims 1 to 6, wherein the relationship between the second porous body and the acute angle angle α ₂ satisfies 0 ° <θ ₁ ≤ 90 ° − α ₂ .
8. The housing is bent at a bending line including the first dividing region.
   When the cross section along the extending direction and the thickness direction of the first porous body is viewed, the bending is performed in a state where the first porous body has one or more acute angles and the housing is bent. With respect to the outer wall surface of the housing in which the first porous body closest to the line is arranged, the bending angle θ ₁ of the outer wall surface of the housing in which the second porous body closest to the first porous body is arranged. The heat diffusion device according to any one of claims 1 to 6, wherein the relationship between the first porous body and the acute angle angle α ₁ satisfies 0 ° <θ ₁ ≤ 90 ° − α ₁ .
9. The housing is bent at a bending line including the first dividing region.
   When the cross section along the extending direction and the thickness direction of the first porous body is viewed, the housing in which the first porous body closest to the bending line is arranged in a bent state of the housing. The bending angle θ ₁ of the outer wall surface of the housing in which the second porous body closest to the first porous body is arranged with respect to the outer wall surface of the above is 10 ° or more and 45 ° or less, according to claims 1 to 8. The heat diffusion device according to any one item.
10. The heat diffusion device according to any one of claims 1 to 9, wherein a plurality of the second porous bodies are arranged in the first divided region in a direction in which the first porous body extends.
11. The first porous body has a plurality of the first divided regions, and the first porous body has a plurality of the first divided regions.
    Of the bending lines including each of the first dividing regions, the orientation of the housing that can be bent with at least one bending line as a boundary is the same as the orientation of the housing that can be bent with another bending line as a boundary. , The heat diffusion device according to any one of claims 1 to 10.
12. The first porous body has a plurality of the first divided regions, and the first porous body has a plurality of the first divided regions.
    A claim that the orientation of the housing that is bent at least one of the bending lines including the first dividing region is different from the orientation of the housing that is bent at another bending line. Item 2. The heat diffusion device according to any one of Items 1 to 10.
13. The invention according to any one of claims 1 to 12, wherein when the cross section perpendicular to the thickness direction is viewed, the bending line including the first dividing region is inclined with respect to the contour line of the housing. Heat diffusion device.
14. An electronic device provided with the heat diffusion device according to any one of claims 1 to 13.

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