Patent ID: 7866374

Claim:
A heat pipe comprising: a cylinder-shaped metal casing containing a working fluid therein, the casing comprising an evaporating section and a condensing section at opposite ends thereof, respectively, and an adiabatic section located between the evaporating section and the condensing section; and a capillary wick arranged on an inner wall of the casing, an inner surface of the capillary wick forming a vapor passage extending along a longitudinal direction of the casing; wherein the capillary wick comprises a plurality of shaped foils stacked along a radial direction of the metal casing, each shaped foil defines multiple channels therein for the working fluid to flow from the condensing section to the evaporating section through the adiabatic section, at least one of the foils has a plurality of protruding portions extending from a surface thereof, the protruding portions are spaced from each other, each of the protruding portions has only one side connecting the corresponding surface of the at least one foil, and a plurality of pores is defined in the at least one foil below the protruding portions, respectively.