US Patent 11555656 Vapor chamber

A vapor chamber that includes a housing having a first sheet and a second sheet facing each other, wherein at least a part of an outer edge of the housing has a step shape in which an end portion of the second sheet is positioned inside an end portion of the first sheet, and the housing has a bonded portion inside the end portion of the second sheet where the first sheet and the second sheet are bonded to each other; a protective film covering a boundary between the end portion of the second sheet and the first sheet at the step shape; a working fluid enclosed in the housing, and a wick on an inner wall surface of the first sheet or the second sheet.