US Patent 10184729 Heat pipe

A heat pipe includes a container in which a corrugated portion is formed, the container having a hollow portion formed therein that is sealed, a wick structure provided on an inner peripheral surface of the hollow portion and a working fluid enclosed in the hollow portion. The wick structure has a vapor channel penetrating therethrough in a longitudinal direction of the hollow portion, the wick structure producing a capillary force. The wick structure is a sintered body of a powder metal material and projected into a crest portion of the corrugated portion. The wick structure is provided at a region in the crest portion of the corrugated portion and at a position of a trough portion of the corrugated portion.