Patent ID: 6901994

Claim:
A flat heat pipe having a vacuum chamber which is provided with an evaporator in contact with a heating element, and a condenser connected to a cooling device, said vacuum chamber being provided in a hollow interior with a first wick structure, and a predetermined amount of a working fluid by which an evaporation-condensation cycle is effected; wherein said vacuum chamber is provided in the hollow interior with a plurality of heat conduction pillars; said heat conduction pillars are in contact with an upper wall and a lower wall of the hollow interior of said vacuum chamber, and said heat conduction pillars are disposed only within a central section of the flat heat pipe so as to allow condensates to be collected around both sides of the upper wall of the flat heat pipe; further wherein said flat heat pipe further comprises a plurality of second wick structures arranged alternately with the heat conduction pillars, said second wick structures being made of a material different from said first wick structure and; at least some of said heat conduction pillars have different cross-section area and shape from other heat conduction pillars.