Patent attributes
The vapor chamber includes a casing, a working fluid, a microchannel, and a wick. The casing includes an upper casing sheet and a lower casing sheet that face each other and are joined together at an outer edge so as to define an internal space therebetween. The microchannel is in the lower casing sheet and in communication with the internal space so as to form a flow path for the working fluid. The wick is in the internal space of the casing, and is in contact with the microchannel. The microchannel has a plurality of convexes that form the flow path, an area ratio of an area of the plurality of convexes to an entire area of the microchannel is 5% to 40% in a plan view of the vapor chamber, and a height of the plurality of convexes is 5 to 50 μm.