Vapor chamber and cooling device

Abstract

To provide a vapor chamber capable of efficiently cooling a heating element even when the vapor chamber is placed in an inclined manner.SOLUTION: A vapor chamber 1 includes a chamber body 10. The chamber body 10 includes a front surface 11, a bottom surface 24, a first inclined surface 25, a second inclined surface 26 and a top surface 27. The front surface 11 includes a placement region 17 where a heating element 2 is placed. In plan view of the front surface 11, the first inclined surface 25 and the second inclined surface 26 are inclined with respect to the bottom surface in such a manner that a sealed space spreads gradually from the bottom surface 24 toward the top surface 27. In plan view of the front surface 11, the placement region 17 is located between the first inclined surface 25 and the second inclined surface 26.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a vapor chamber and a cooling device. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2001-165585 (Patent Document 1) discloses a flat heat pipe including a heat generating section, a first condensation section, a second condensation section, a first intermediate section, and a second intermediate section. The first intermediate section includes a first short-path section that provides a shortcut between the heat generating section and the first condensation section. The second intermediate section includes a second short-path section that provides a shortcut between the heat generating section and the second condensation section. The heat generating section is provided with a heat generating element attachment section to which a heat generating element is attached. A working fluid is sealed inside the flat heat pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-165585 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the flat heat pipe described in Patent Document 1, the wall surface constituting the heat pipe is located immediately above the heat generating part. Therefore, the vapor generated by the evaporation of the working fluid is blocked by the wall surface and goes around to the first condensation part and the second condensation part. In this way, the vapor does not move directly to the condensation part but reaches the condensation part via a bypass route, so it takes a long time for the working fluid to return to the heat generating part via the condensation part after evaporating. As a result, the cooling efficiency of the flat heat pipe is reduced. An object of the present disclosure is to provide a vapor chamber and a cooling device equipped with a vapor chamber that can efficiently cool a heat-generating body even if the vapor chamber is positioned at an angle. [Means for solving the problem]

[0005] A vapor chamber according to a first aspect of the present disclosure includes a chamber body. An enclosed space in which a working liquid is sealed is provided inside the chamber body. The chamber body includes a front surface, a rear surface opposite the front surface, a first main surface on the rear side of the front surface, a second main surface facing the first main surface, a bottom surface, a first inclined surface, a second inclined surface, and a top surface. The first main surface, the second main surface, the bottom surface, the first inclined surface, the second inclined surface, and the top surface define an enclosed space. The front surface includes a mounting area on which a heating element is mounted. The bottom surface is connected to the first main surface and the second main surface, and includes a first edge and a second edge. The first edge and the second edge are both end edges of the bottom surface in a plan view of the front surface. The top surface is connected to the first main surface and the second main surface, and faces the bottom surface, the first inclined surface, and the second inclined surface. The first inclined surface is connected to the first main surface, the second main surface, and the first edge, and is inclined relative to the bottom surface so that the sealed space gradually expands from the bottom surface to the top surface in a plan view of the front surface. The second inclined surface is connected to the first main surface, the second main surface, and the second edge, and is inclined relative to the bottom surface so that the sealed space gradually expands from the bottom surface to the top surface in a plan view of the front surface. In a plan view of the front surface, the placement area is between the first inclined surface and the second inclined surface.

[0006] A vapor chamber according to a second aspect of the present disclosure includes a flat container. A space in which a working fluid is sealed is provided inside the container. The container has a heat dissipation section that dissipates heat transferred from a heating element into the space, and a condensation section in which the vapor of the working fluid evaporated by the heat of the heat dissipation section condenses. The inner surface of the container has a first main surface having the heat dissipation section, a second main surface facing the first main surface, a first side surface, a second side surface, a bottom surface, a top surface, a first inclined surface, and a second inclined surface. The first side surface is connected to the first main surface and the second main surface. The second side surface is connected to the first main surface and the second main surface, and faces the first side surface. The bottom surface is connected to the first main surface and the second main surface. The bottom surface has a first edge on the side of the first side surface and a second edge on the side of the second side surface, and extends from the first edge to the second edge. The top surface is connected to the first and second main surfaces and faces the bottom surface. The first inclined surface is inclined from the first edge toward the first side surface so as to become higher as it moves away from the bottom surface. The second inclined surface is inclined from the second edge toward the second side surface so as to become higher as it moves away from the bottom surface. A condensation portion is provided between the top surface and the bottom surface.

[0007] The cooling device of the present disclosure comprises the vapor chamber of the first or second aspect of the present disclosure and a cooler attached to the vapor chamber. Effect of the Invention

[0008] The vapor chamber and cooling device of the present disclosure can efficiently cool a heat-generating element even when placed at an angle. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic perspective view of a vapor chamber and a cooling device according to the first embodiment. [Diagram 2] 2 is a schematic cross-sectional view of the vapor chamber and cooling device of the first embodiment taken along the cross-sectional line II-II shown in FIG. 1. [Diagram 3] 3 is a schematic partial cross-sectional view of the vapor chamber and cooling device of embodiment 1 taken along the cross-sectional line III-III shown in FIGS. 1 and 2. FIG. [Figure 4] 1 is a schematic cross-sectional view of a vapor chamber of embodiment 1 that is arranged so that the z direction is inclined relative to the vertical direction in a plane along the front surface. FIG. [Diagram 5] 1 is a schematic cross-sectional view of a vapor chamber of embodiment 1 that is arranged so that the z direction is inclined relative to the vertical direction in a plane along the front surface. FIG. [Figure 6] FIG. 1 is a schematic partial cross-sectional view of a vapor chamber of embodiment 1, which is arranged so that the z direction is inclined relative to the vertical direction within a plane defined by the z direction and the x direction in which the front and back surfaces are spaced apart from each other. [Figure 7] FIG. 1 is a schematic partial cross-sectional view of a vapor chamber of embodiment 1, which is arranged so that the z direction is inclined relative to the vertical direction within a plane defined by the z direction and the x direction in which the front and back surfaces are spaced apart from each other. [Figure 8] 1 is a schematic cross-sectional view of a vapor chamber of a first comparative example, which is arranged so that the z direction is inclined with respect to the vertical direction in a plane along the front surface. FIG. [Figure 9] 1 is a schematic cross-sectional view of a vapor chamber of a first comparative example, which is arranged so that the z direction is inclined with respect to the vertical direction in a plane along the front surface. FIG. [Figure 10] FIG. 1 is a schematic partial cross-sectional view of a vapor chamber of a first comparative example, which is arranged so that the z direction is inclined with respect to the vertical direction within a plane defined by the z direction and the x direction in which the front and back surfaces are spaced apart from each other. [Figure 11] FIG. 11 is a schematic partial cross-sectional view of a vapor chamber of a second comparative example, which is arranged so that the z direction is inclined with respect to the vertical direction within a plane defined by the z direction and the x direction in which the front and back surfaces are spaced apart from each other. [Figure 12] FIG. 11 is a schematic cross-sectional view of a vapor chamber and a cooling device of a second embodiment. [Figure 13] 13 is a schematic partial cross-sectional view of the vapor chamber and the cooling device of the second embodiment taken along the cross-sectional line XIII-XIII shown in FIG. 12. [Figure 14] FIG. 11 is a schematic cross-sectional partial view of a vapor chamber of a third comparative example. [Figure 15] FIG. 11 is a schematic cross-sectional view of a vapor chamber and a cooling device of a third embodiment. [Figure 16] 16 is a schematic partial cross-sectional view of the vapor chamber and cooling device of embodiment 3 taken along the cross-sectional line XVI-XVI shown in FIG. 15. [Figure 17] FIG. 11 is a schematic partial cross-sectional view of a vapor chamber and a cooling device of a modified example of embodiment 3. [Figure 18] FIG. 11 is a schematic cross-sectional view of a vapor chamber and a cooling device of a fourth embodiment. [Figure 19] 19 is a schematic partial cross-sectional view of the vapor chamber and cooling device of the fourth embodiment taken along the cross-sectional line XIX-XIX shown in FIG. 18. [Figure 20] FIG. 13 is a schematic partial cross-sectional view of a vapor chamber and a cooling device of a modified example of embodiment 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described. Note that the same reference numerals are used to refer to the same components, and the description thereof will not be repeated.

[0011] Embodiment 1

[0012] A vapor chamber 1 and a cooling device 4 according to a first embodiment will be described with reference to Fig. 1 to Fig. 3. The cooling device 4 includes a vapor chamber 1 and a cooler 3. The vapor chamber 1 includes a chamber body 10 and a working liquid 30.

[0013] The chamber body 10 is formed of a metal such as copper (Cu). The size of the chamber body 10 in the thickness direction (x direction) of the chamber body 10 may be smaller than the size of the chamber body 10 in the z direction perpendicular to the thickness direction of the chamber body 10. The size of the chamber body 10 in the x direction may be smaller than the size of the chamber body 10 in the y direction perpendicular to the x and z directions.

[0014] The chamber body 10 is a container having a space therein in which the working liquid 30 is sealed. After the working liquid 30 is sealed, the chamber body 10 is sealed to form a sealed space (working liquid sealing space) 20 inside the chamber body 10. The sealed space 20 is degassed. The working liquid 30 is, for example, water, an ethylene glycol aqueous solution, or an organic solvent such as acetone or ethanol.

[0015] The chamber body 10 has a front surface 11, a rear surface 12, a bottom surface 13, a top surface 14, a first outer surface 15, and a second outer surface 16. The chamber body 10 has, as inner surfaces constituting the sealed space 20, a first main surface 21, a second main surface 22, a bottom surface 24, a first inclined surface 25, a second inclined surface 26, a top surface 27, a first side surface 28, and a second side surface 29.

[0016] The lower surface 13 and the bottom surface 24 are surfaces that are on the lower side in the vertical direction when the vapor chamber 1 is in operation. The upper surface 14 and the top surface 27 are surfaces that are on the upper side in the vertical direction when the vapor chamber 1 is in operation. When the vapor chamber 1 is not in operation (for example, when the vapor chamber 1 is manufactured or when the vapor chamber 1 is sold), the lower surface 13 and the bottom surface 24 do not have to be on the lower side in the vertical direction, and the upper surface 14 and the top surface 27 do not have to be on the upper side in the vertical direction.

[0017] As shown in FIG. 1, the front surface 11 extends in the z-direction and the y-direction. The front surface 11 includes a mounting area 17 on which a heating element 2 is mounted. The heating element 2 is, for example, an electronic device that generates heat during operation. The heating element 2 is, for example, a transmitting / receiving module or a receiving module of an array antenna. As shown in FIG. 2, the mounting area 17 is the area of ​​the front surface 11 closest to the bottom surface 24. In a plan view of the front surface 11, the mounting area 17 overlaps the bottom surface 24. In a plan view of the front surface 11, the mounting area 17 is between a first inclined surface 25 and a second inclined surface 26.

[0018] The rear surface 12 extends in the z direction and the y direction. The rear surface 12 is opposite to the front surface 11. The front surface 11 and the rear surface 12 are both end surfaces of the chamber body 10 in the thickness direction (x direction) of the chamber body 10. The front surface 11 and the rear surface 12 are spaced apart from each other in the x direction. A cooler 3 such as a heat sink is attached to the rear surface 12. The rear surface 12 is the mounting surface for the cooler 3.

[0019] The lower surface 13 is a surface located on the lower side in the vertical direction when the vapor chamber 1 is in operation, and is connected to the front surface 11 and the rear surface 12. The upper surface 14 is a surface located on the upper side in the vertical direction when the vapor chamber 1 is in operation, and is connected to the front surface 11 and the rear surface 12. The first outer surface 15 and the second outer surface 16 are connected to the front surface 11 and the rear surface 12, respectively. In this manner, the front surface 11 and the rear surface 12 are connected to the upper surface 14 at the upper ends of the front surface 11 and the rear surface 12, connected to the lower surface 13 at the lower ends of the front surface 11 and the rear surface 12, and connected to the first outer surface 15 and the second outer surface 16 at the side ends of the front surface 11 and the rear surface 12.

[0020] The first main surface 21, the second main surface 22, the bottom surface 24, the first inclined surface 25, the second inclined surface 26, the top surface 27, the first side surface 28, and the second side surface 29 define a sealed space 20. The chamber body 10 is a flat sealed container, and the sealed space 20 in which the working liquid 30 is sealed is provided inside the chamber body 10. The chamber body 10 has a storage section 18 in which the working liquid 30 is stored, a heat dissipation section 23 that dissipates heat transferred from the heating element 2 to the sealed space 20, and a condensation section 19 in which the vapor of the working liquid 30 evaporated by the heat of the heat dissipation section 23 is cooled and condensed.

[0021] 3, the first main surface 21 is on the rear side of the front surface 11. The first main surface 21 extends in the z direction and the y direction. For example, the first main surface 21 is parallel to the front surface 11, and the inclination angle of the first main surface 21 with respect to the front surface 11 is zero degrees. The first main surface 21 has a heat dissipation section 23 that dissipates heat transferred from the heating element 2 to the sealed space 20. The heat dissipation section 23 may be, for example, a region on the rear side of the mounting region 17 of the front surface 11.

[0022] As shown in FIG. 3, the second main surface 22 is on the rear side of the rear surface 12. The second main surface 22 faces the first main surface 21 in the x direction. The second main surface 22 is inclined with respect to the front surface 11. That is, the second main surface 22 is inclined with respect to the first main surface 21. The second main surface 22 is inclined with respect to the rear surface 12. The second main surface 22 gradually approaches the first main surface 21 from the bottom surface 24 toward the top surface 27. That is, the second main surface 22 is inclined with respect to the first main surface 21 such that the distance between the second main surface 22 and the first main surface 21 becomes shorter from the bottom surface 24 toward the top surface 27.

[0023] In a cross section defined by the z direction and the x direction, the inclination of the second main surface 22 with respect to the z direction is greater than the inclination of the first main surface 21 with respect to the z direction. In a cross section defined by the z direction and the x direction, the inclination of the second main surface 22 with respect to the front surface 11 is greater than the inclination of the first main surface 21 with respect to the front surface 11. In a cross section defined by the z direction and the x direction, the inclination of the second main surface 22 with respect to the back surface 12 is greater than the inclination of the first main surface 21 with respect to the back surface 12. In a cross section defined by the z direction and the x direction, the inclination of the second main surface 22 with respect to the back surface 12 is greater than the inclination of the first main surface 21 with respect to the front surface 11.

[0024] In a cross section defined by the z direction and the x direction, the inclination angle α of the second main surface 22 with respect to the back surface 12 is the tolerance angle θ t (See Figure 6) For example, the tolerance angle θ t is 1° and the tilt angle α is greater than 1°.

[0025] As shown in FIG. 2 and FIG. 3, the bottom surface 24 extends, for example, in the x direction and the y direction. The bottom surface 24 may be a plane perpendicular to the z direction. The bottom surface 24 is connected to the first main surface 21, the second main surface 22, the first inclined surface 25, and the second inclined surface 26. The bottom surface 24 includes a first edge 24a and a second edge 24b. In a plan view of the front surface 11, the first edge 24a and the second edge 24b are both end edges of the bottom surface 24. The second edge 24b is on the opposite side to the first edge 24a in the y direction. That is, the bottom surface 24 extends from the first edge 24a on the side of the first side surface 28 to the second edge 24b on the side of the second side surface 29.

[0026] The first inclined surface 25 is connected to the first main surface 21, the second main surface 22, the first edge 24a of the bottom surface 24, and the first side surface 28. As shown in Fig. 2, in a plan view of the front surface 11, the first inclined surface 25 is inclined with respect to the bottom surface 24 so that the sealed space 20 gradually expands from the bottom surface 24 toward the top surface 27. In a plan view of the front surface 11, the inclination angle θ1 of the first inclined surface 25 with respect to the bottom surface 24 is smaller than the tolerance angle θ of the arrangement of the vapor chamber 1. t (See Figures 4 to 6). For example, the tolerance angle θ t is 1°, and the inclination angle θ1 is greater than 1°.

[0027] The second inclined surface 26 is connected to the first main surface 21, the second main surface 22, the second edge 24b of the bottom surface 24, and the second side surface 29. The first inclined surface 25 and the second inclined surface 26 are spaced apart from each other in the y direction. As shown in FIG. 2, in a plan view of the front surface 11, the second inclined surface 26 is inclined with respect to the bottom surface 24 such that the sealed space 20 gradually expands from the bottom surface 24 toward the top surface 27. In a plan view of the front surface 11, the inclination angle θ2 of the second inclined surface 26 with respect to the bottom surface 24 is equal to the tolerance angle θ of the arrangement of the vapor chamber 1. t (See FIG. 4 and FIG. 5). The inclination angle θ2 may be equal to the inclination angle θ1 or may be different from the inclination angle θ1. For example, the tolerance angle θ t is 1°, and the inclination angle θ2 is greater than 1°.

[0028] Thus, the chamber body 10 has a first inclined surface 25 that inclines from a first edge 24a, which is one end of the bottom surface 24, toward a first side surface 28 so as to become higher as it moves away from the bottom surface 24, and a second inclined surface 26 that inclines from a second edge 24b, which is the other end of the bottom surface 24, toward a second side surface 29 so as to become higher as it moves away from the bottom surface 24. Note that, in this embodiment, the second main surface 22 is inclined with respect to the first main surface 21, but the second main surface 22 may be parallel to the first main surface 21.

[0029] As shown in FIG. 2 and FIG. 3, the top surface 27 faces the bottom surface 24, the first inclined surface 25, and the second inclined surface 26. The bottom surface 24 and the top surface 27 are spaced apart from each other in the z direction. The top surface 27 and the first inclined surface 25 are spaced apart from each other in the z direction. The top surface 27 and the second inclined surface 26 are spaced apart from each other in the z direction. The top surface 27 extends, for example, in the x direction and the y direction. The top surface 27 may be a plane perpendicular to the z direction. The top surface 27 is connected to the first main surface 21, the second main surface 22, the first side surface 28, and the second side surface 29. A condensation section 19 is provided between the top surface 27 facing the bottom surface 24 and the bottom surface 24.

[0030] 2, the first side surface 28 and the second side surface 29 face each other and are spaced apart from each other in the y direction. The first side surface 28 and the second side surface 29 extend, for example, in the z direction and the x direction, respectively. The first side surface 28 is connected to the first main surface 21, the second main surface 22, the top surface 27, and the first inclined surface 25. The second side surface 29 is connected to the first main surface 21, the second main surface 22, the top surface 27, and the second inclined surface 26.

[0031] The sealed space 20 includes a storage portion 18 in which the hydraulic fluid 30 is stored. The storage portion 18 is a portion of the sealed space 20 that is closest to a bottom surface 24. In a plan view of the front surface 11, the storage portion 18 overlaps with the mounting area 17. The storage portion 18 is defined by a first main surface 21, a second main surface 22, a bottom surface 24, a first inclined surface 25, and a second inclined surface 26.

[0032] The sealed space 20 includes a condensation section 19 where steam evaporated by the heat of the heating element 2 is cooled and condensed. The condensation section 19 is an upper part of the sealed space 20. In a plan view of the front surface 11, the condensation section 19 is a part of the sealed space 20 that is above the mounting area 17 and the heat dissipation section 23. The condensation section 19 includes at least the parts of the sealed space 20 that are immediately above the mounting area 17 and the heat dissipation section 23.

[0033] An example of a method for manufacturing the vapor chamber 1 of this embodiment will be described. Two copper plates are prepared. A recess is formed on one surface of each of the two copper plates. In addition, at least one of the two copper plates is provided with an inlet for injecting the working liquid 30. Next, the recesses of the two copper plates are assembled so that an internal space is formed by the recesses of the two copper plates. The two copper plates are brazed together. After that, the working liquid 30 is injected into the internal space through the inlet. The internal space is degassed. The inlet is sealed to form the sealed space 20. In this manner, the vapor chamber 1 can be manufactured.

[0034] The operation of the vapor chamber 1 of this embodiment will be described.

[0035] The vapor chamber 1 is disposed so that the z direction is vertical and the bottom surface 24 is the lowest of the surfaces defining the sealed space 20. Therefore, the z direction in which the bottom surface 24 and the top surface 27 are spaced apart from each other is vertical. The top surface 27 is the uppermost of the surfaces defining the sealed space 20. The mounting area 17 is the lowest area of ​​the front surface 11. The reservoir 18 is the lowermost part of the sealed space 20. The working fluid 30 is stored in the reservoir 18 of the sealed space 20, and the working fluid 30 is in contact with a portion of the first main surface 21 on the back side of the mounting area 17 (the heat dissipation portion 23).

[0036] When the heating element 2 is in operation, heat is generated from the heating element 2. This heat is transferred from the mounting area 17 of the front surface 11 to the heat dissipation portion 23 of the first main surface 21 on the back side of the front surface 11, and then transferred from the heat dissipation portion 23 to the working liquid 30. The temperature of the working liquid 30 rises, and the working liquid 30 becomes steam. The steam rises toward the top surface 27, and the heat of the heating element 2 is spread throughout the vapor chamber 1. As the steam rises, the distance from the heating element 2 increases, and the temperature of the steam decreases. The steam condenses and becomes the working liquid 30. The second main surface 22 is farther from the heating element 2 and closer to the cooler 3 than the first main surface 21. The second main surface 22 has a lower temperature than the first main surface 21. Therefore, the condensed working liquid 30 adheres to the second main surface 22, the first side surface 28, and the second side surface 29. Gravity acting on the condensed working fluid 30 attached to the second main surface 22, the first side surface 28, and the second side surface 29 causes the condensed working fluid 30 to move on the second main surface 22, the first side surface 28, the second side surface 29, the first inclined surface 25, and the second inclined surface 26 toward the storage portion 18. The condensed working fluid 30 is returned to the storage portion 18.

[0037] By repeating phase changes of evaporation and condensation, the working liquid 30 continues to evaporate due to the heat from the heating element 2, and the working liquid 30 continues to accumulate in the reservoir 18 and to contact the portion of the first main surface 21 on the back side of the mounting area 17 (heat dissipation portion 23). The heat generated by the heating element 2 is spread by the vapor chamber 1, and the heating element 2 continues to be efficiently cooled. During the operation of the heating element 2, the temperature of the heating element 2 is maintained at an appropriate temperature.

[0038] The operation of this embodiment when the vapor chamber 1 is arranged at an angle will be described with reference to FIGS.

[0039] As shown in FIG. 2, in the vapor chamber 1 of this embodiment, the sealed space 20 includes a first inclined surface 25 and a second inclined surface 26. In a plan view of the front surface 11, the mounting area 17 is between the first inclined surface 25 and the second inclined surface 26. Therefore, as shown in FIG. 4 and FIG. 5, even if the vapor chamber 1 is arranged so that the z direction is inclined with respect to the vertical direction in a plane (yz plane) along the front surface 11, the working liquid 30 continues to contact the part (heat dissipation part 23) on the back side of the mounting area 17 of the first main surface 21. The heat generated by the heating element 2 is spread by the vapor chamber 1, and the heating element 2 continues to be efficiently cooled. During the operation of the heating element 2, the temperature of the heating element 2 is kept at an appropriate temperature.

[0040] In contrast, in the vapor chamber 1p of the first comparative example shown in Figures 8 to 10, the sealed space 20 does not include the first inclined surface 25 and the second inclined surface 26. Therefore, as shown in Figures 8 and 9, when the vapor chamber 1p of the first comparative example is arranged so that the z direction is inclined with respect to the vertical direction in a plane (yz plane) along the front surface 11, the working fluid 30 moves away from a portion (heat dissipation portion 23) of the first main surface 21 on the back side of the mounting area 17. The cooling efficiency of the heat generating body 2 decreases, and there is a risk that the temperature of the heat generating body 2 will rise excessively.

[0041] As shown in FIG. 3, in the vapor chamber 1 of this embodiment, the second main surface 22 is inclined with respect to the back surface 12, and gradually approaches the first main surface 21 from the bottom surface 24 to the top surface 27. Therefore, as shown in FIG. 6 and FIG. 7, even if the vapor chamber 1 is arranged so that the z direction is inclined with respect to the vertical direction in a plane (xz plane) defined by the z direction and the x direction, the working liquid 30 continues to contact the part (heat dissipation part 23) of the first main surface 21 on the back side of the mounting area 17. The heat generated by the heating element 2 is spread by the vapor chamber 1, and the heating element 2 continues to be efficiently cooled. During the operation of the heating element 2, the temperature of the heating element 2 is kept at an appropriate temperature.

[0042] Also, as shown in FIG. 7, even if the vapor chamber 1 of this embodiment is arranged so that the z direction is inclined with respect to the vertical direction in the plane (xz plane) defined by the z direction and the x direction, the inclination of the second main surface 22 with respect to the vertical direction is small. The component along the second main surface 22 of the gravity acting on the condensed working liquid 30 attached to the second main surface 22 is large. The speed at which the condensed working liquid 30 attached to the second main surface 22 moves on the second main surface 22 is higher, and the amount of the condensed working liquid 30 that flows back to the storage section 18 per unit time is larger. Therefore, even if the vapor chamber 1 is arranged so that the z direction is inclined with respect to the vertical direction in the plane (xz plane) defined by the z direction and the x direction, the working liquid 30 continues to be in contact with the portion (heat dissipation section 23) on the back side of the mounting area 17 of the first main surface 21. The heating element 2 continues to be efficiently cooled. During operation of the heating element 2, the temperature of the heating element 2 is maintained at an appropriate temperature.

[0043] 8 to 10, the second main surface 22 is parallel to the back surface 12 and perpendicular to the bottom surface 24. Therefore, as shown in Fig. 10, when the vapor chamber 1p of the first comparative example is arranged so that the z direction is inclined with respect to the vertical direction in a plane (xz plane) defined by the z direction and the x direction, the working fluid 30 moves away from a portion (heat dissipation portion 23) of the first main surface 21 on the back side of the mounting area 17. The cooling efficiency of the heat generating body 2 decreases, and there is a risk that the temperature of the heat generating body 2 will rise excessively.

[0044] 10, when the vapor chamber 1p of the first comparative example is arranged so that the z direction is inclined with respect to the vertical direction in a plane (xz plane) defined by the z direction and the x direction, the inclination of the second main surface 22 with respect to the vertical direction becomes large. The component of gravity acting on the condensed working fluid 30 attached to the second main surface 22 along the second main surface 22 becomes small. The speed at which the condensed working fluid 30 attached to the second main surface 22 moves on the second main surface 22 decreases, and the amount of the condensed working fluid 30 returning to the storage section 18 per unit time decreases. The amount of working fluid 30 stored in the storage section 18 decreases, or the working fluid 30 disappears from the storage section 18. The contact area between the working fluid 30 and the portion (heat dissipation portion 23) of the first main surface 21 on the rear side of the mounting area 17 is reduced, or the working fluid 30 no longer comes into contact with the portion (heat dissipation portion 23) of the first main surface 21 on the rear side of the mounting area 17. The cooling efficiency of the heat generating body 2 is reduced, and there is a risk that the temperature of the heat generating body 2 will rise excessively.

[0045] 11, the first main surface 21 is inclined with respect to the front surface 11. Specifically, the first main surface 21 gradually approaches the second main surface 22 from the bottom surface 24 toward the top surface 27. The second main surface 22 is parallel to the back surface 12 and perpendicular to the bottom surface 24.

[0046] Therefore, as shown in Fig. 11, when the vapor chamber 1q of the second comparative example is arranged so that the z direction is inclined with respect to the vertical direction in a plane (xz plane) defined by the z direction and the x direction, the inclination of the second main surface 22 with respect to the vertical direction becomes large. The component of gravity acting on the condensed working fluid 30 attached to the second main surface 22 along the second main surface 22 becomes small. The speed at which the condensed working fluid 30 attached to the second main surface 22 moves on the second main surface 22 decreases, and the amount of the condensed working fluid 30 that flows back to the storage section 18 per unit time decreases. The amount of working fluid 30 stored in the storage section 18 decreases, or the working fluid 30 disappears from the storage section 18. The contact area between the working fluid 30 and the portion (heat dissipation portion 23) of the first main surface 21 on the rear side of the mounting area 17 is reduced, or the working fluid 30 no longer comes into contact with the portion (heat dissipation portion 23) of the first main surface 21 on the rear side of the mounting area 17. The cooling efficiency of the heat generating body 2 is reduced, and there is a risk that the temperature of the heat generating body 2 will rise excessively.

[0047] The effects of the vapor chamber 1 of this embodiment will be described.

[0048] The vapor chamber 1 of this embodiment includes a chamber body 10. Inside the chamber body 10, a sealed space 20 in which a working liquid 30 is sealed is provided. The chamber body 10 includes a front surface 11, a back surface 12 opposite to the front surface 11, a first main surface 21 on the back side of the front surface 11, a second main surface 22 facing the first main surface 21, a bottom surface 24, a first inclined surface 25, a second inclined surface 26, and a top surface 27. The first main surface 21, the second main surface 22, the bottom surface 24, the first inclined surface 25, the second inclined surface 26, and the top surface 27 define a sealed space 20. The front surface 11 includes a mounting area 17 on which the heating element 2 is mounted. The bottom surface 24 is connected to the first main surface 21 and the second main surface 22, and includes a first edge 24a and a second edge 24b. The first edge 24a and the second edge 24b are both end edges of the bottom surface 24 in a plan view of the front surface 11. The top surface 27 is connected to the first main surface 21 and the second main surface 22, and faces the bottom surface 24, the first inclined surface 25, and the second inclined surface 26. The first inclined surface 25 is connected to the first main surface 21, the second main surface 22, and the first edge 24a, and is inclined with respect to the bottom surface 24 so that the sealed space 20 gradually expands from the bottom surface 24 to the top surface 27 in a plan view of the front surface 11. The second inclined surface 26 is connected to the first main surface 21, the second main surface 22, and the second edge 24b, and is inclined with respect to the bottom surface 24 so that the sealed space 20 gradually expands from the bottom surface 24 to the top surface 27 in a plan view of the front surface 11. In a plan view of the front surface 11, the placement area 17 is located between the first inclined surface 25 and the second inclined surface .

[0049] In this way, since the vapor chamber 1 has the first inclined surface 25 and the second inclined surface 26, even if the vapor chamber 1 is arranged so that the direction (z direction) in which the bottom surface 24 and the top surface 27 are separated from each other in a plane (yz plane) along the front surface 11 is inclined with respect to the vertical direction, the working liquid 30 continues to contact the portion (heat dissipation portion 23) of the first main surface 21 on the back side of the mounting area 17. Therefore, the vapor chamber 1 can efficiently cool the heating element 2.

[0050] The vapor chamber 1 is arranged so as to operate when the flat vapor chamber 1 is upright, i.e., the longitudinal direction of the first main surface 21 is vertical (the up-down direction in FIG. 2). Therefore, the working fluid 30 condensed in the condenser 19 can be returned to the reservoir 18 by gravity alone, and the vapor chamber 1 does not include a capillary structure such as sintered metal or wire mesh. Therefore, the cost of the vapor chamber 1 can be reduced.

[0051] In the vapor chamber 1 of the present embodiment, the second main surface 22 is inclined with respect to the back surface 12, and gradually approaches the first main surface 21 from the bottom surface 24 toward the top surface 27.

[0052] Even if the vapor chamber 1 is disposed such that the direction in which the bottom surface 24 and the top surface 27 are separated from each other is inclined with respect to the vertical direction within a plane (xz plane) defined by the direction in which the bottom surface 24 and the top surface 27 are separated from each other (z direction) and the direction in which the front surface 11 and the back surface 12 are separated from each other (x direction), the working liquid 30 continues to contact the portion (heat dissipation portion 23) of the first main surface 21 on the back side of the mounting area 17. Therefore, the vapor chamber 1 can efficiently cool the heating element 2.

[0053] In the vapor chamber 1 of this embodiment, the rear surface 12 is a surface on which the cooler 3 is attached.

[0054] The heat generated by the heating element 2 is spread in the vapor chamber 1 and dissipated to the cooler 3. Therefore, the vapor chamber 1 can cool the heating element 2 efficiently.

[0055] The vapor chamber 1 of this embodiment includes a flat container (chamber body 10). A space (sealed space 20) in which the working liquid 30 is sealed is provided inside the container. The container has a heat dissipation section 23 that dissipates heat transferred from the heating element 2 into the space, and a condensation section 19 in which the vapor of the working liquid 30 evaporated by the heat of the heat dissipation section 23 is condensed. The inner surface of the container has a first main surface 21 having the heat dissipation section 23, a second main surface 22 facing the first main surface 21, a first side surface 28, a second side surface 29, a bottom surface 24, a top surface 27, a first inclined surface 25, and a second inclined surface 26. The first side surface 28 is connected to the first main surface 21 and the second main surface 22. The second side surface 29 is connected to the first main surface 21 and the second main surface 22, and faces the first side surface 28. The bottom surface 24 is connected to the first main surface 21 and the second main surface 22. The bottom surface 24 has a first edge 24a on the first side surface 28 side and a second edge 24b on the second side surface 29 side, and extends from the first edge 24a to the second edge 24b. The top surface 27 is connected to the first main surface 21 and the second main surface 22, and faces the bottom surface 24. The first inclined surface 25 is inclined from the first edge 24a toward the first side surface 28 so as to become higher as it moves away from the bottom surface 24. The second inclined surface 26 is inclined from the second edge 24b toward the second side surface 29 so as to become higher as it moves away from the bottom surface 24. A condensation section 19 is provided between the top surface 27 and the bottom surface 24.

[0056] In this way, since the vapor chamber 1 has the first inclined surface 25 and the second inclined surface 26, even if the vapor chamber 1 is arranged so as to be inclined, the working liquid 30 continues to contact the heat dissipation portion 23 of the first main surface 21. The vapor chamber 1 can efficiently cool the heating element 2.

[0057] The vapor chamber 1 is arranged so as to operate when the flat vapor chamber 1 is upright, i.e., the longitudinal direction of the first main surface 21 is vertical (the up-down direction in FIG. 2). Therefore, the working fluid 30 condensed in the condenser 19 can be returned to the reservoir 18 by gravity alone, and the vapor chamber 1 does not include a capillary structure such as sintered metal or wire mesh. Therefore, the cost of the vapor chamber 1 can be reduced.

[0058] In the vapor chamber 1 of the present embodiment, the second main surface 22 is inclined with respect to the first main surface 21 so that the distance between the first main surface 21 and the second main surface 22 becomes narrower from the bottom surface 24 toward the top surface 27.

[0059] Therefore, even if the vapor chamber 1 is arranged so as to be tilted, the working liquid 30 continues to be in contact with the heat dissipation portion 23 of the first main surface 21. The vapor chamber 1 can cool the heat generating element 2 efficiently.

[0060] The cooling device 4 of this embodiment includes a vapor chamber 1 and a cooler 3. The cooler 3 is attached to the vapor chamber 1.

[0061] In this way, the cooling device 4 includes the vapor chamber 1. Therefore, even if the vapor chamber 1 is arranged at an angle, the heating element 2 can be efficiently cooled, and the cost of the cooling device 4 can be reduced.

[0062] Embodiment 2

[0063] The vapor chamber 1 and the cooling device 4 of the second embodiment will be described with reference to Fig. 12 and Fig. 13. The vapor chamber 1 and the cooling device 4 of the present embodiment have the same configuration as the vapor chamber 1 and the cooling device 4 of the first embodiment, but differ mainly in the following points.

[0064] In this embodiment, the second main surface 22 is inclined with respect to the front surface 11 and the back surface 12, and gradually approaches the first main surface 21 from the top surface 27 toward the bottom surface 24. The second main surface 22 includes a first inclined portion 22a and a second inclined portion 22b. The second inclined portion 22b is closer to the bottom surface 24 than the first inclined portion 22a. As shown in FIG. 13, in a cross section defined by the z direction and the x direction, the inclination angle α2 of the second inclined portion 22b with respect to the back surface 12 (or the z direction) is smaller than the inclination angle α1 of the first inclined portion 22a with respect to the back surface 12 (or the z direction). The area of ​​the second inclined portion 22b may be larger than the area of ​​the first inclined portion 22a. In a cross section defined by the z direction and the x direction, the length of the second inclined portion 22b may be larger than the length of the first inclined portion 22a.

[0065] The operation of the vapor chamber 1 of the present embodiment will be described in comparison with the vapor chamber 1r of the third comparative example. As shown in Fig. 14, the vapor chamber 1r of the third comparative example is configured similarly to the vapor chamber 1 of the present embodiment, but differs from the vapor chamber 1 of the present embodiment in that the entire second main surface 22 is inclined at an inclination angle α1 with respect to the back surface 12 (or the z direction) in a cross section defined by the z direction and the x direction.

[0066] In the third comparative example, the entire second main surface 22 is inclined at an inclination angle α1 with respect to the back surface 12 (or the z direction). Therefore, the width of the storage section 18 in the x direction is narrowed. The capillary force acting on the working liquid 30 prevents the working liquid 30 from contacting the bottom surface 24. The working liquid 30 is unable to contact a part of the portion (heat dissipation section 23) of the first main surface 21 on the back side of the mounting area 17. Heat from the heating element 2 is not efficiently transferred to the working liquid 30. In addition, the component of gravity acting on the condensed working liquid 30 attached to the second main surface 22 along the second main surface 22 is reduced over the entire second main surface 22. The speed at which the condensed working liquid 30 attached to the second main surface 22 moves on the second main surface 22 is reduced, and the amount of condensed working liquid 30 returning to the storage section 18 per unit time is reduced. Thus, in the vapor chamber 1r of the third comparative example, the cooling efficiency of the heat generating element 2 decreases.

[0067] In contrast, in this embodiment, the second main surface 22 includes a first inclined portion 22a and a second inclined portion 22b. The inclination angle α2 of the second inclined portion 22b with respect to the back surface 12 (or the z direction) is smaller than the inclination angle α1 of the first inclined portion 22a with respect to the back surface 12 (or the z direction). Therefore, the width of the storage portion 18 in the x direction increases. The capillary force does not act on the working liquid 30, and the working liquid 30 can contact the bottom surface 24. The contact area between the working liquid 30 and the portion (heat dissipation portion 23) of the first main surface 21 on the back side of the placement area 17 increases. Heat from the heating element 2 is efficiently transferred to the working liquid 30. In addition, the component along the second main surface 22 of the gravity acting on the condensed working liquid 30 attached to the second main surface 22 increases in the second inclined portion 22b of the second main surface 22. The speed at which the condensed working liquid 30 adhering to the second main surface 22 moves on the second main surface 22 increases, and the amount of condensed working liquid 30 returning to the reservoir 18 per unit time increases. The heating element 2 is efficiently cooled. During operation of the heating element 2, the temperature of the heating element 2 is maintained at an appropriate temperature.

[0068] The vapor chamber 1 of the present embodiment has the following effects in addition to the effects of the vapor chamber 1 of the first embodiment.

[0069] In the vapor chamber 1 of this embodiment, the second main surface 22 is inclined with respect to the back surface 12, and gradually approaches the first main surface 21 from the top surface 27 toward the bottom surface 24. The second main surface 22 includes a first inclined portion 22a and a second inclined portion 22b that is closer to the bottom surface 24 than the first inclined portion 22a. The inclination angle α2 of the second inclined portion 22b with respect to the back surface 12 is smaller than the inclination angle α1 of the first inclined portion 22a with respect to the back surface 12.

[0070] Therefore, the width of the reservoir 18 in the direction in which the front surface 11 and the back surface 12 are separated from each other (x direction) increases. The capillary force does not act on the working liquid 30, and the working liquid 30 can contact the bottom surface 24. The contact area between the working liquid 30 and the portion of the first main surface 21 on the back side of the mounting area 17 (heat dissipation portion 23) increases. Heat from the heating element 2 is efficiently transferred to the working liquid 30. In addition, the component of gravity acting on the condensed working liquid 30 attached to the second main surface 22 along the second main surface 22 increases at the second inclined portion 22b of the second main surface 22. The amount of condensed working liquid 30 that flows back to the reservoir 18 per unit time increases. The vapor chamber 1 can efficiently cool the heating element 2.

[0071] In the vapor chamber 1 of the present embodiment, the area of ​​the second inclined portion 22b is larger than the area of ​​the first inclined portion 22a.

[0072] Therefore, the width of the reservoir 18 in the direction in which the front surface 11 and the back surface 12 are spaced apart from each other (x direction) is further increased. The capillary force does not act on the working liquid 30, and the working liquid 30 can contact the bottom surface 24. The contact area between the working liquid 30 and the portion of the first main surface 21 on the back side of the mounting area 17 (heat dissipation portion 23) is increased. The heat from the heating element 2 is efficiently transferred to the working liquid 30. In addition, the component of gravity acting on the condensed working liquid 30 attached to the second main surface 22 along the second main surface 22 is increased at the second inclined portion 22b of the second main surface 22. The amount of the condensed working liquid 30 that flows back to the reservoir 18 per unit time is further increased. The vapor chamber 1 can efficiently cool the heating element 2.

[0073] Embodiment 3

[0074] The vapor chamber 1 and the cooling device 4 of the third embodiment will be described with reference to Fig. 15 and Fig. 16. The vapor chamber 1 and the cooling device 4 of the present embodiment have the same configuration as the vapor chamber 1 and the cooling device 4 of the first embodiment, but differ mainly in the following points.

[0075] The vapor chamber 1 of this embodiment further includes a plurality of fins 35. The plurality of fins 35 are formed of a metal such as copper (Cu). The plurality of fins 35 may be formed of the same material as the chamber body 10. The plurality of fins 35 extend at least in the z direction. That is, the plurality of fins 35 may extend in the z direction or may extend in a direction oblique to the z direction. In this embodiment, the plurality of fins 35 extend in the z direction. The plurality of fins 35 extend toward the bottom surface 24, the first inclined surface 25, or the second inclined surface 26. At least one of the plurality of fins 35 extends toward the bottom surface 24. At least one of the plurality of fins 35 may extend toward the first inclined surface 25. At least one of the plurality of fins 35 may extend toward the second inclined surface 26.

[0076] The multiple fins 35 are provided on the first main surface 21 and protrude from the first main surface 21. As shown in Fig. 15, in a plan view of the front surface 11, some of the multiple fins 35 overlap the mounting area 17. The multiple fins 35 may be spaced apart from the bottom surface 24, the first inclined surface 25, and the second inclined surface 26. The multiple fins 35 may be spaced apart from the top surface 27.

[0077] 17, in a modification of the present embodiment, a plurality of fins 35 may be provided on second main surface 22 and protrude from second main surface 22. In the modification of the present embodiment, as shown in FIG.

[0078] The vapor chamber 1 of the present embodiment has the following effects in addition to the effects of the vapor chamber 1 of the first embodiment.

[0079] The vapor chamber 1 of the present embodiment further includes a plurality of fins 35 protruding from the first main surface 21 or the second main surface 22. The plurality of fins 35 extend toward the bottom surface 24, the first inclined surface 25, or the second inclined surface 26.

[0080] Due to gravity acting on the condensed working liquid 30, the condensed working liquid 30 moves over the second main surface 22 and the multiple fins 35 toward the storage section 18. The amount of condensed working liquid 30 returning to the storage section 18 per unit time increases. The amount of working liquid 30 contacting the portion of the first main surface 21 on the back side of the mounting area 17 (heat dissipation section 23) increases. The vapor chamber 1 of this embodiment can efficiently cool the heating element 2.

[0081] Furthermore, the multiple fins 35 increase the thickness of the portion of the chamber body 10 where the multiple fins 35 are provided, improving the mechanical strength of that portion. Even if the sealed space 20 is evacuated and atmospheric pressure acts on the front surface 11 and rear surface 12 of the chamber body 10, the multiple fins 35 can prevent the chamber body 10 from being damaged. Furthermore, since the mechanical strength of the portion of the chamber body 10 where the multiple fins 35 are provided is improved, the thickness of the chamber body 10 other than that portion can be reduced. Therefore, the vapor chamber 1 can be made lighter.

[0082] In the vapor chamber 1 of the present embodiment, a portion of the multiple fins 35 overlaps the mounting area 17 in a plan view of the front surface 11.

[0083] The condensed working fluid 30 moving among the fins 35 is reliably supplied to the portion (heat dissipation portion 23) of the first main surface 21 on the rear side of the mounting area 17. The heat from the heating element 2 is also spread by the fins 35. The vapor chamber 1 can efficiently cool the heating element 2.

[0084] Embodiment 4

[0085] The vapor chamber 1 and the cooling device 4 of the fourth embodiment will be described with reference to Fig. 18 and Fig. 19. The vapor chamber 1 and the cooling device 4 of the present embodiment have the same configuration as the vapor chamber 1 and the cooling device 4 of the third embodiment, but differ mainly in the following points.

[0086] 18, in this embodiment, the fins 35 are inclined with respect to the z direction. The fins 35 are inclined with respect to the bottom surface 24. Each of the fins 35 extends toward the mounting area 17 as it approaches the bottom surface 24.

[0087] The multiple fins 35 include multiple first fins 36 and multiple second fins 37. The multiple first fins 36 and the multiple second fins 37 are provided on the first main surface 21 and protrude from the first main surface 21. As shown in FIG. 18, in a plan view of the front surface 11, a portion of the multiple first fins 36 overlaps the mounting area 17. In a plan view of the front surface 11, a portion of the multiple second fins 37 overlaps the mounting area 17. The multiple first fins 36 and the multiple second fins 37 may be separated from the bottom surface 24, the first inclined surface 25, and the second inclined surface 26. The multiple first fins 36 and the multiple second fins 37 may be separated from the top surface 27.

[0088] Each of the first fins 36 faces the bottom surface 24 and the first inclined surface 25. In a plan view of the front surface 11, each of the first fins 36 is inclined from the first edge 24a to the second edge 24b as it moves from the top surface 27 to the bottom surface 24. Each of the first fins 36 is inclined with respect to the bottom surface 24 in the same direction as the first inclined surface 25. An inclination angle β1 of each of the first fins 36 with respect to the bottom surface 24 is equal to or greater than an inclination angle θ1 of the first inclined surface 25 with respect to the bottom surface 24. The inclination angle β1 may be equal to the inclination angle θ1 or may be different from the inclination angle θ1.

[0089] Each of the second fins 37 faces the bottom surface 24 and the second inclined surface 26. In a plan view of the front surface 11, each of the second fins 37 is inclined from the second edge 24b to the first edge 24a as it moves from the top surface 27 to the bottom surface 24. Each of the second fins 37 is inclined with respect to the bottom surface 24 in the same direction as the second inclined surface 26. An inclination angle β2 of each of the second fins 37 with respect to the bottom surface 24 is equal to or greater than an inclination angle θ2 of the second inclined surface 26 with respect to the bottom surface 24. The inclination angle β2 may be equal to the inclination angle θ2 or may be different from the inclination angle θ2.

[0090] 20, in a modification of the present embodiment, a plurality of first fins 36 and a plurality of second fins 37 may be provided on second main surface 22 and protrude from second main surface 22. As shown in FIG.

[0091] The vapor chamber 1 of the present embodiment has the following effects similar to those of the vapor chamber 1 of the third embodiment.

[0092] In the vapor chamber 1 of the present embodiment, the multiple fins 35 are inclined with respect to the bottom surface 24, and extend toward the mounting area 17 as they approach the bottom surface 24.

[0093] Therefore, the condensed working fluid 30 moving among the fins 35 is reliably supplied to the portion (heat dissipation portion 23) of the first main surface 21 on the rear side of the mounting area 17. The vapor chamber 1 of the present embodiment can efficiently cool the heating element 2.

[0094] In the vapor chamber 1 of the present embodiment, the multiple fins 35 include a first fin 36 facing the first inclined surface 25 and a second fin 37 facing the second inclined surface 26. In a plan view of the front surface 11, the first fin 36 is inclined from the first edge 24a to the second edge 24b from the top surface 27 to the bottom surface 24. In a plan view of the front surface 11, the second fin 37 is inclined from the second edge 24b to the first edge 24a from the top surface 27 to the bottom surface 24.

[0095] Due to gravity acting on the condensed working liquid 30, the condensed working liquid 30 moves over the second main surface 22, the first fin 36, and the second fin 37 toward the storage section 18. The amount of condensed working liquid 30 returning to the storage section 18 per unit time increases. The amount of working liquid 30 contacting the portion of the first main surface 21 on the back side of the mounting area 17 (heat dissipation section 23) increases. The vapor chamber 1 of the present embodiment can efficiently cool the heating element 2.

[0096] Furthermore, the first fin 36 and the second fin 37 increase the thickness of the portion of the chamber body 10 where the first fin 36 and the second fin 37 are provided, improving the mechanical strength of the portion. Even if the sealed space 20 is evacuated and atmospheric pressure acts on the front surface 11 or the rear surface 12 of the chamber body 10, the first fin 36 and the second fin 37 can prevent the chamber body 10 from being damaged. Furthermore, since the mechanical strength of the portion of the chamber body 10 where the first fin 36 and the second fin 37 are provided is improved, the thickness of the chamber body 10 other than the portion can be reduced. Therefore, the vapor chamber 1 can be made lighter.

[0097] In the vapor chamber 1 of the present embodiment, the inclination angle β1 of the first fin 36 with respect to the bottom surface 24 is equal to or greater than the inclination angle θ1 of the first inclined surface 25 with respect to the bottom surface 24. The inclination angle β2 of the second fin 37 with respect to the bottom surface 24 is equal to or greater than the inclination angle θ2 of the second inclined surface 26 with respect to the bottom surface 24.

[0098] Due to gravity acting on the condensed working liquid 30, the condensed working liquid 30 moves faster over the first fins 36 and the second fins 37 toward the storage section 18. The amount of condensed working liquid 30 returning to the storage section 18 per unit time increases. The amount of working liquid 30 contacting the portion of the first main surface 21 on the back side of the mounting area 17 (heat dissipation section 23) increases. The vapor chamber 1 of the present embodiment can efficiently cool the heating element 2.

[0099] In the vapor chamber 1 of the present embodiment, a portion of the multiple first fins 36 and a portion of the multiple second fins 37 overlap the mounting area 17 in a plan view of the front surface 11.

[0100] The condensed working fluid 30 moving through the multiple fins 35 is reliably supplied to a portion (heat dissipation portion 23) of the first main surface 21 on the rear side of the mounting area 17. In addition, the heat from the heating element 2 is also spread by some of the multiple first fins 36 and some of the multiple second fins 37. The vapor chamber 1 can efficiently cool the heating element 2.

[0101] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) A chamber body is provided, A sealed space in which a working fluid is sealed is provided inside the chamber body, the chamber body includes a front surface, a back surface opposite to the front surface, a first main surface on the back side of the front surface, a second main surface opposite to the first main surface, a bottom surface, a first inclined surface, a second inclined surface, and a top surface, the first main surface, the second main surface, the bottom surface, the first inclined surface, the second inclined surface, and the top surface define the sealed space, The front surface includes a mounting area on which a heating element is mounted, the bottom surface is connected to the first main surface and the second main surface and includes a first edge and a second edge, the first edge and the second edge being both end edges of the bottom surface in a plan view of the front surface; the top surface is connected to the first main surface and the second main surface, and faces the bottom surface, the first inclined surface, and the second inclined surface; the first inclined surface is connected to the first main surface, the second main surface, and the first edge, and is inclined with respect to the bottom surface such that the sealed space gradually expands from the bottom surface toward the top surface in the plan view of the front surface, the second inclined surface is connected to the first main surface, the second main surface, and the second edge, and is inclined with respect to the bottom surface such that the sealed space gradually expands from the bottom surface toward the top surface in the plan view of the front surface, In the plan view of the front surface, the placement area is a vapor chamber located between the first inclined surface and the second inclined surface. (Appendix 2) The vapor chamber of claim 1, wherein the second main surface is inclined with respect to the back surface and gradually approaches the first main surface from the bottom surface to the top surface. (Appendix 3) the second main surface is inclined with respect to the back surface and gradually approaches the first main surface from the top surface to the bottom surface; the second main surface includes a first inclined portion and a second inclined portion closer to the bottom surface than the first inclined portion; 2. The vapor chamber of claim 1, wherein an inclination angle of the second inclined portion relative to the rear surface is smaller than an inclination angle of the first inclined portion relative to the rear surface. (Appendix 4) 4. The vapor chamber of claim 3, wherein an area of ​​the second inclined portion is greater than an area of ​​the first inclined portion. (Appendix 5) further comprising a plurality of fins protruding from the first major surface or the second major surface; 5. The vapor chamber of claim 1, wherein the plurality of fins extend toward the bottom surface, the first inclined surface, or the second inclined surface. (Appendix 6) The vapor chamber of claim 5, wherein the plurality of fins are inclined with respect to the bottom surface and extend toward the placement area as they approach the bottom surface. (Appendix 7) the plurality of fins include a first fin facing the first inclined surface and a second fin facing the second inclined surface, In the plan view of the front surface, the first fin is inclined from the first edge toward the second edge as it moves from the top surface to the bottom surface, The vapor chamber of claim 5 or 6, wherein, in the planar view of the front surface, the second fin is inclined from the second edge toward the first edge as it moves from the top surface to the bottom surface. (Appendix 8) an inclination angle of the first fin with respect to the bottom surface is equal to or greater than an inclination angle of the first inclined surface with respect to the bottom surface; 8. The vapor chamber of claim 7, wherein an inclination angle of the second fin relative to the bottom surface is equal to or greater than an inclination angle of the second inclined surface relative to the bottom surface. (Appendix 9) 9. The vapor chamber of claim 5, wherein a portion of the fins overlaps the mounting area in the plan view of the front surface. (Appendix 10) a flat-plate-shaped container having a space inside which a working fluid is sealed, the container having a heat dissipation section which dissipates heat transferred from a heating element into the space, and a condensation section in which vapor of the working fluid evaporated by the heat of the heat dissipation section is condensed; The inner surface of the container is A first main surface having the heat dissipation portion; a second main surface opposite to the first main surface; a first side surface connected to the first main surface and the second main surface; a second side surface connected to the first main surface and the second main surface and facing the first side surface; a bottom surface connected to the first main surface and the second main surface; the bottom surface has a first edge on the first side surface side and a second edge on the second side surface side, and extends from the first edge to the second edge; The interior surface of the container further comprises: a top surface connected to the first main surface and the second main surface and facing the bottom surface; a first inclined surface that is inclined from the first edge toward the first side surface so as to become higher as it moves away from the bottom surface; a second inclined surface that is inclined from the second edge toward the second side surface so as to become higher as it moves away from the bottom surface; The condensation section is provided between the top surface and the bottom surface. (Appendix 11) 11. The vapor chamber of claim 10, wherein the second major surface is inclined relative to the first major surface such that the distance between the first major surface and the second major surface narrows from the bottom surface to the top surface. (Appendix 12) The vapor chamber according to any one of claims 1 to 11, and a cooler attached to the vapor chamber.

[0102] The disclosed embodiments 1 to 4 and their modified examples should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is indicated by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0103] 1, 1p, 1q, 1r vapor chamber, 2 heating element, 3 cooler, 4 cooling device, 10 chamber body, 11 front surface, 12 rear surface, 17 mounting area, 18 storage section, 20 sealed space, 21 first main surface, 22 second main surface, 22a first inclined portion, 22b second inclined portion, 24 bottom surface, 24a first edge, 24b second edge, 25 first inclined surface, 26 second inclined surface, 27 top surface, 28 first side surface, 29 second side surface, 30 working fluid, 35 fins, 36 first fin, 37 second fin.

Claims

1. A chamber body is provided, A sealed space in which a working fluid is sealed is provided inside the chamber body, the chamber body includes a front surface, a back surface opposite to the front surface, a first main surface on the rear side of the front surface, a second main surface opposite to the first main surface, a bottom surface, a first inclined surface, a second inclined surface, and a top surface, the first main surface, the second main surface, the bottom surface, the first inclined surface, the second inclined surface, and the top surface define the sealed space, The front surface includes a mounting area on which a heating element is mounted, the bottom surface is connected to the first main surface and the second main surface and includes a first edge and a second edge, the first edge and the second edge being both end edges of the bottom surface in a plan view of the front surface; the top surface is connected to the first main surface and the second main surface, and faces the bottom surface, the first inclined surface, and the second inclined surface; the first inclined surface is connected to the first main surface, the second main surface, and the first edge, and is inclined with respect to the bottom surface such that the sealed space gradually expands from the bottom surface toward the top surface in the plan view of the front surface, the second inclined surface is connected to the first main surface, the second main surface, and the second edge, and is inclined with respect to the bottom surface such that the sealed space gradually expands from the bottom surface toward the top surface in the plan view of the front surface, A vapor chamber, wherein the placement area is located between the first inclined surface and the second inclined surface in the plan view of the front surface.

2. The vapor chamber of claim 1 , wherein the second main surface is inclined with respect to the back surface and gradually approaches the first main surface from the bottom surface to the top surface.

3. the second main surface is inclined with respect to the back surface and gradually approaches the first main surface from the top surface to the bottom surface; the second main surface includes a first inclined portion and a second inclined portion that is closer to the bottom surface than the first inclined portion; The vapor chamber of claim 1 , wherein an inclination angle of the second inclined portion with respect to the rear surface is smaller than an inclination angle of the first inclined portion with respect to the rear surface.

4. The vapor chamber of claim 3 , wherein an area of ​​the second inclined portion is greater than an area of ​​the first inclined portion.

5. further comprising a plurality of fins protruding from the first major surface or the second major surface; The vapor chamber of claim 1 , wherein the plurality of fins extend toward the bottom surface, the first inclined surface, or the second inclined surface.

6. The vapor chamber according to claim 5 , wherein the plurality of fins are inclined with respect to the bottom surface and extend toward the placement area as they approach the bottom surface.

7. the plurality of fins include a first fin facing the first inclined surface and a second fin facing the second inclined surface, In the plan view of the front surface, the first fin is inclined from the first edge toward the second edge as it moves from the top surface to the bottom surface, The vapor chamber of claim 5 , wherein, in the plan view of the front surface, the second fin is inclined from the second edge toward the first edge as it moves from the top surface to the bottom surface.

8. an inclination angle of the first fin with respect to the bottom surface is equal to or greater than an inclination angle of the first inclined surface with respect to the bottom surface; The vapor chamber of claim 7 , wherein an inclination angle of the second fin relative to the bottom surface is equal to or greater than an inclination angle of the second inclined surface relative to the bottom surface.

9. The vapor chamber according to claim 5 , wherein a portion of the plurality of fins overlaps the mounting area in the plan view of the front surface.

10. a flat-plate-shaped container having a space inside which a working fluid is sealed, the container having a heat dissipation section which dissipates heat transferred from a heating element into the space, and a condensation section in which vapor of the working fluid evaporated by the heat of the heat dissipation section is condensed; The inner surface of the container is A first main surface having the heat dissipation portion; a second main surface opposite to the first main surface; a first side surface connected to the first main surface and the second main surface; a second side surface connected to the first main surface and the second main surface and facing the first side surface; a bottom surface connected to the first main surface and the second main surface; the bottom surface has a first edge on the side of the first side and a second edge on the side of the second side, and extends from the first edge to the second edge; The interior surface of the container further comprises: a top surface connected to the first main surface and the second main surface and facing the bottom surface; a first inclined surface that is inclined from the first edge toward the first side surface so as to become higher as it moves away from the bottom surface; a second inclined surface that is inclined from the second edge toward the second side surface so as to become higher as it moves away from the bottom surface; The condensation section is provided between the top surface and the bottom surface.

11. The vapor chamber of claim 10 , wherein the second major surface is inclined relative to the first major surface such that a distance between the first major surface and the second major surface decreases from the bottom surface to the top surface.

12. The vapor chamber according to any one of claims 1 to 11; and a cooler attached to the vapor chamber.

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