US Patent 11058031 Vapor chamber

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.