Patent ID: 8611089

Claim:
A heat pipe for cooling an exothermic body by the vaporization and condensation of an enclosed cooling medium, the heat pipe comprising: a flat plate-like upper plate; a flat plate-like lower plate opposed to the upper plate; and a plurality of flat plate-like intermediate plates overlaid on each other between the upper plate and the lower plate, the intermediate plates including internal through-holes; wherein: the internal through-holes are adapted such that only part of each through-hole is overlapped on each other to form capillary tube paths, each capillary tube path having a cross-sectional area smaller than the cross-sectional area of the internal through-hole in the flat surface direction; and each of the upper plate, the lower plate and a plurality of the intermediate plates each include an external through-hole, the external through-holes being superposed on each other to form a via hole.