Heat spreader with vapor chamber

Abstract

A heat spreader includes a base with a cavity defined therein and a cover mounted on the base to thereby hermetically seal the cavity of the base. A predetermined quantity of working liquid is contained in the cavity. The heat spreader further includes a first wick structure formed on an inner surface of the base, a second wick structure formed on an inner surface of the cover and a third wick structure embedded in the first wick structure. The first and second wick structures are made of metal mesh, carbon nanotube array or bundle of fibers and the third wick structure is made of sintered metal powder. In use, the third wick structure is positioned corresponding to a heat generating electronic component.

1 . A heat spreader comprising:
 a base;   a cover mounted on the base thereby defining a chamber enveloped by the base and the cover;   a working liquid contained in the chamber;   a first wick structure spreading on an inner surface of the base and defining a receiving portion in the first wick structure;   a second wick structure spreading on an inner surface of the cover; and   a third wick structure embedded in the receiving portion of the first wick structure.   
   
   
       2 . The heat spreader as claimed in  claim 1 , wherein the first wick structure connects with the second wick structure. 
   
   
       3 . The heat spreader as claimed in  claim 2 , wherein pores in the first wick structure and pores in a circumference of the second wick structure are communicated with each other. 
   
   
       4 . The heat spreader as claimed in  claim 1 , wherein a circumference of the third wick structure connects with the first wick structure, the third wick structure being wholly received in the receiving portion of the first wick structure. 
   
   
       5 . The heat spreader as claimed in  claim 1 , wherein the first wick structure and the second wick structure are structures having low flow impedance. 
   
   
       6 . The heat spreader as claimed in  claim 5 , wherein the first wick structure and the second wick structure each are selected from one of metal mesh, carbon nanotube array and bundle of fibers. 
   
   
       7 . The heat spreader as claimed in  claim 1 , wherein the third wick structure is formed by sintered metal powder. 
   
   
       8 . The heat spreader as claimed in  claim 1 , wherein the third wick structure is located corresponding to a central portion of the base, the first wick structure being the same type wick structure as the second wick structure, and the third wick being another type wick structure different from the first wick structure. 
   
   
       9 . The heat spreader as claimed in  claim 1 , wherein a flange circumferentially extends outwardly and horizontally from a top of the base, and the flange hermetically engages with a circumference of the cover. 
   
   
       10 . A heat spreader comprising:
 a base with a cavity defined therein;   a cover hermetically covering the base;   a working liquid contained in the cavity;   a first wick structure attached on an inner surface of the base;   a second wick structure attached on an inner surface of the cover; and   a third wick structure formed on a central portion of the inner surface of the base and surrounded by the first wick structure.   
   
   
       11 . The heat spreader as claimed in  claim 10 , wherein a circumference of the second wick structure connects with the first wick structure. 
   
   
       12 . The heat spreader as claimed in  claim 10 , wherein a circumference of the third wick structure tightly contacts with the first wick structure. 
   
   
       13 . The heat spreader as claimed in  claim 10 , wherein the first wick structure is selected from one of metal mesh, carbon nanotube array and bundle of fibers. 
   
   
       14 . The heat spreader as claimed in  claim 10 , wherein the second wick structure is selected from one of metal mesh, carbon nanotube array and bundle of fibers. 
   
   
       15 . The heat spreader as claimed in  claim 10 , wherein the third wick structure is formed by sintered metal powder. 
   
   
       16 . The heat spreader as claimed in  claim 10 , wherein a flange circumferentially extends outwardly from a top of the base, and the flange hermetically engages with a circumference of the cover. 
   
   
       17 . The heat spreader as claimed in  claim 10 , wherein the first wick structure and the third wick structure together form a structure of a single layer.