Patent attributes
A loop heat pipe includes a pair of outermost metal layers, an intermediate metal layer provided between the pair of outermost metal layers, an evaporator, a condenser, a liquid pipe and a vapor pipe connecting the evaporator and the condenser and forming a loop shaped passage. The intermediate metal layer includes a pair of walls forming a part of a pipe wall of the evaporator, the condenser, the liquid pipe, and the vapor pipe, and a porous body provided between the pair of walls. The intermediate metal layer includes a first surface opposing one of the pair of outermost metal layers, and a plurality of first cavities, and a first projection between mutually adjacent first cavities, respectively famed at the first surface between the pair of walls. A first gap is famed between the first projection and the one of the pair of outermost metal layers.