Patent ID: 7936560

Claim:
A cooling device comprising a chassis capable of being electrically and mechanically connected to and disconnected from a blade including an electronic circuit substrate having a plurality of semiconductor devices by moving the blade with respect to the chassis in a direction, a heat pipe which includes a heat absorption part for absorbing a heat energy from CPU as at least one of the semiconductor devices and a vapor condensing tube for discharging therefrom the heat energy, and which is attachable to the blade so that the vapor condensing tube extends in its longitudinal direction along the direction when moving the blade with respect to the chassis in the direction, and a heat radiator attached to a surface of the vapor condensing tube to accelerate the heat energy discharge from the vapor condensing tube, wherein the vapor condensing tube has on its inner surface a groove extending in the longitudinal direction of the vapor condensing tube, spiral fins ends of each of which spiral fins are opposite to each other in a circumferential direction of the inner surface to terminate respectively at the groove, and a bundle of wicks extending longitudinally in the groove.