Patent ID: 8047269

Claim:
A thermal spreader comprising: a casing having a first side contacted with a heat source and a second side of said casing secured with a heat sink, and having a vapor chamber defined in an interior in the casing; and a crosslinking capillary lattice formed in the casing and occupying the vapor chamber in the casing, whereby upon evacuation to form vacuum in the vapor chamber and filling of a vaporizable working fluid in the vapor chamber, the working fluid will be repeatedly vaporized and condensed through the crosslinking capillary lattice to absorb and remove heat from the first side of the casing and to dissipate heat outwardly from the second side of the casing; said casing including: a first cover, which is contacted with a heat source; and a second cover combined with the first cover to define the vapor chamber in between the first cover and the second cover for forming said lattice therein; said second cover secured with a heat sink thereto; said crosslinking capillary lattice including: a lower longitudinal grid closely contacted with the first cover, and an upper latitudinal grid superimposed on the lower longitudinal grid and closely contacted with the second cover; with the two grids occupying the vapor chamber in the casing and respectively contacted with two capillary thin layers respectively formed in the first and second covers; said lower longitudinal grid, as superimposed under the upper latitudinal grid, including: a plurality of lower longitudinal strips juxtapositionally formed in a lower frame, with every two neighboring lower longitudinal strips defining a lower longitudinal capillary slit between the two lower longitudinal strips to be fluidically communicated with a lower capillary thin layer formed in the first cover; said upper latitudinal grid including: a plurality of upper latitudinal strips being respectively projectively perpendicular to the lower longitudinal strips and juxtapositionally formed in an upper frame superimposed on the lower frame, with every two neighboring upper latitudinal strips defining an upper latitudinal capillary slit between the two upper latitudinal strips to be fluidically communicated with an upper capillary thin layer formed in the second cover, and each said upper latitudinal capillary slit fluidically communicated with each said lower longitudinal capillary slit to thereby define a vertical capillary opening through the lower longitudinal capillary slit and the upper latitudinal capillary slit through the two grids; and each said grid including some strips made as solid strips, and the other strips made as porous or fluid-absorbable strips.