Abstract: A thermal diffusion device that includes: a housing having a first inner wall surface and a second inner wall surface that face each other in a thickness direction and define and internal space; a working medium enclosed in the internal space of the housing; and a wick in the internal space of the housing. The wick includes: a support that is in contact with the first inner wall surface; a perforated body that is in contact with the support, the perforated body having a through-hole that penetrates the perforated body in the thickness direction; and a protrusion portion on a peripheral edge of the through-hole and extending in a direction toward the first inner wall surface.

Abstract: A thermal diffusion device that includes: a housing having a first inner wall surface and a second inner wall surface that face each other in a thickness direction and define an internal space; a working medium enclosed in the internal space of the housing; and a wick in the internal space of the housing. The wick includes: a support that is in contact with the first inner wall surface; a perforated body that is in contact with the support, the perforated body having a through-hole that penetrates the perforated body in the thickness direction; and protrusion portion extending from a peripheral edge of the through-hole in a direction toward the second inner wall surface.

Abstract: A thermal diffusion device that includes: a housing including a first inner wall surface and a second inner wall surface facing each other in a thickness direction; a working medium sealed in an inner space of the housing; and a wick structure in the inner space of the housing, the wick structure including a supporting portion in contact with the first inner wall surface and a portion having holes composed of a same material as the supporting portion and integral with the supporting portion.

Abstract: A thermal diffusion device that includes: a housing having a first inner wall surface and a second inner wall surface facing each other in a thickness direction and defining an internal space of the housing; a working medium enclosed in the internal space of the housing; and a wick having a sheet shape and disposed in the internal space of the housing, wherein the wick has at least one bent portion protruding from the first inner wall surface toward the second inner wall surface, and wherein a space defined by the at least one bent portion of the wick and the first inner wall surface forms a liquid channel for the working medium.

Abstract: A vapor chamber that includes a housing including a first sheet and a second sheet opposing each other and joined together at outer edges of the first sheet and the second sheet and defining a hollow vapor flow pass therein; a working fluid in the housing; a first wick in contact with the vapor flow pass; and a second wick between the first wick and an inner wall surface of at least one of the first sheet and the second sheet. The first wick defines a first liquid flow pass, the second wick defines a second liquid flow pass, and a first average diameter of the first liquid flow pass is smaller than or equal to 75% of a second average diameter of the second liquid flow pass.

Abstract: A vapor chamber that includes a housing, a wick structure joined to a major inside surface of the housing, and a working liquid enclosed inside the housing. The wick structure is joined to the housing at a joint portion within a joint region, and a proportion of a total area of the joint portion within the joint region to an area of the joint region is 50% or less.

Abstract: A vapor chamber includes a housing including first and second sheets that face each other and that include respective outer edge portions joined to each other, supports that support the first and second sheets from inside and that are disposed therebetween, and a hydraulic fluid enclosed in the housing. The first and second sheets do not include an angled portion having an angle of about 90° or less between a joint and a support nearest to the joint. The expression 0.02?b/a?0.3 is satisfied, where a is a distance from an outer edge of the outermost support to an inner edge of the joint between the first and second sheets, and b is a distance between the first and second sheets at the outer edge of the outermost support.

Abstract: A vapor chamber that includes a housing composed of a first sheet and a second sheet facing each other and having outer edge portions thereof joined to each other to define an internal space, the second sheet having a plurality of projecting portions on an inner surface thereof that faces the internal space; a pillar between the first sheet and the second sheet and supporting them from the internal space; a wick arranged in the housing, and a working fluid enclosed in the housing. A first flow path and a second flow path are formed in the internal space, and a cross-sectional area of the second flow path is larger than a cross-sectional area of the first flow path.

Abstract: A vapor chamber that includes a housing including a first sheet and a second sheet opposing each other and having respective outer edges of the first sheet and the second sheet joined together; an operation fluid enclosed in the housing; a wick on an inner surface of the first sheet and/or an inner surface of the second sheet; a first pillar on the inner surface of the first sheet and/or the inner surface of the second sheet and that defines a cavity in the housing; and a second pillar on the inner surface of the first sheet and/or the inner surface of the second sheet and configured to prevent the housing from being warped when heated to join the first sheet and the second sheet together.

Abstract: A vapor chamber that includes a housing including a first sheet and a second sheet opposing each other and joined together at outer edges of the first sheet and the second sheet and defining a hollow vapor flow pass therein; a working fluid in the housing; a first wick in contact with the vapor flow pass; and a second wick between the first wick and an inner wall surface of at least one of the first sheet and the second sheet. The first wick defines a first liquid flow pass, the second wick defines a second liquid flow pass, and a first average diameter of the first liquid flow pass is smaller than or equal to 75% of a second average diameter of the second liquid flow pass.

Abstract: A vapor chamber that includes a casing, a pillar in an internal space of the casing and that supports the casing from an inside thereof, a working fluid in the internal space of the casing, and recessed portions in at least a portion of a main external surface of the casing.

Abstract: A vapor chamber that includes a casing, a pillar in an internal space of the casing and that supports the casing from an inside thereof, a working fluid in the internal space of the casing, and recessed portions in at least a portion of a main external surface of the casing.

Abstract: A vapor chamber that includes a housing composed of a first sheet and a second sheet facing each other and having outer edge portions thereof joined to each other to define an internal space, the second sheet having a plurality of projecting portions on an inner surface thereof that faces the internal space; a pillar between the first sheet and the second sheet and supporting them from the internal space; a wick arranged in the housing, and a working fluid enclosed in the housing. A first flow path and a second flow path are formed in the internal space, and a cross-sectional area of the second flow path is larger than a cross-sectional area of the first flow path.

Abstract: A vapor chamber that includes a casing, a pillar in an internal space of the casing and that supports the casing from an inside thereof, a working fluid in the internal space of the casing, and recessed portions in at least a portion of a main external surface of the casing.

Abstract: A vapor chamber that includes a housing, a wick structure joined to a major inside surface of the housing, and a working liquid enclosed inside the housing. The wick structure is joined to the housing at a joint portion within a joint region, and a proportion of a total area of the joint portion within the joint region to an area of the joint region is 50% or less.

Abstract: A vapor chamber includes a housing including first and second sheets that face each other and that include respective outer edge portions joined to each other, supports that support the first and second sheets from inside and that are disposed therebetween, and a hydraulic fluid enclosed in the housing. The first and second sheets do not include an angled portion having an angle of about 90° or less between a joint and a support nearest to the joint. The expression 0.02?b/a?0.3 is satisfied, where a is a distance from an outer edge of the outermost support to an inner edge of the joint between the first and second sheets, and b is a distance between the first and second sheets at the outer edge of the outermost support.