Abstract: A heat exchanger utilizes a multi-hole flexible band of light metal which is formed, by extrusion, with a plurality of longitudinal small holes extending in parallel to one another from one band end to the other end. The longitudinal holes are connected at each of the end portions of the band, and both ends of the band is closed by welding to form a sealed cavity partly filled with a working fluid in partial vacuum. The sealed cavity may be in the form of a single long continuous passage, or in the form of parallel passages connected together at both ends. The multi-hole band is bent in such a shape that the band meanders between a high temperature region and a low temperature region. The thus-constructed heat exchanger is advantageous in heat exchanging performance, and capable of reducing the manufacturing and material costs, the weight of the heat exchanger, and improving the reliability.

Abstract: A tunnel-plate type heat pipe is manufactured out of a tube having capillary parallel tunnels defined by partitions through shaping both ends of the tube, forming recesses in the partitions in the vicinity of each end of the tube, closing both ends of the tube to form a capillary tunnel container, cleaning the capillary tunnel container, and charging the capillary tunnel container with a predetermined amount of working fluid.

Abstract: A heat pipe comprises an unit plate having one side formed with a groove which includes a plurality of straight portions arranged in parallel with each other and a plurality of turnings, and a flat plate disposed on the one side of the unit plate.

Abstract: A heat sink comprising a belt-shaped member arranged on a heat radiating side of a heat receiving plate and having one side having a plurality of script's l-shaped pinlike portions. The belt-shaped member includes a capillary heat pipe.