A heat-pipe cooler includes a housing having no air contained therein, working
liquid contained in the housing, a sinter metal held in the housing, and hollow
cooling fins formed on the housing and communicating with interior space of the
housing. Thus, heat produced by a heat source will be transferred to the sinter
metal, and then the working liquid, which has been absorbed by the sinter metal,
is evaporated by the heat, and travels into the cooling fins. And, the evaporated
working liquid is cooled, and changes into liquid form in the cooling fins, drops
onto, and is absorbed by the sinter metal. And finally, the working liquid flows
back to the evaporating section of the cooler along the sinter metal with the help
of capillary force.
