Patent ID: 6477045
Filing Date: 2002-11-05
Classification: F28D,H01L

Abstract:
A heat dissipater for a CPU (central processing unit) comprising:an upper block and a lower block being integrally formed and made of a heat conductive material, the upper block including: a series of fins extending from a first end of the upper block and adapted to mount a cooling fan on the upper block; a first recess defined in a second side of the upper block; and a series of first capillary grooves defined in a periphery of the first recess in the upper block; the lower block securely attached to the second side of the upper block, the lower block having a first side facing the upper block and a second side adapted to abut the CPU, the lower block including; a second recess defined in the first side of the lower block, the second recess corresponding to the first recess in the upper block and defining a closed chamber with the first recess in the upper block after the lower block being securely attached to the second side of the upper block; and a series of second capillary grooves defined in a periphery of the second recess in the lower block, each second capillary groove aligning with and communicating with a corresponding one of the series of first capillary grooves; and volatile liquid received in chamber, the liquid having a volume smaller than that of the chamber, the volatile liquid vaporizes when a temperature of a working environment is raised; wherein a vacuum is drawn on the chamber to remove residual vapor and foreign articles from the chamber before the volatile liquid is drawn into the chamber.