Heat spreader with vapor chamber and heat dissipation apparatus using the same

Abstract

A heat dissipation apparatus includes a heat sink ( 30 ) and a heat spreader ( 10 ). The heat spreader includes a heating area ( 11 ) and a cooling area ( 13 ), and defines a vapor chamber ( 16 ) therein. A plurality of artery meshes ( 151 ) are arranged in the vapor chamber and extend from the heating area towards the cooling area. A working medium is contained in the artery meshes. The artery meshes are located between wick structures ( 15 a , 15 b ) attached to a top cover ( 14 ) and a base plate ( 12 ) of the heat spreader, respectively, and contact therewith.

1 . A heat spreader comprising:
 a base plate;   a top cover hermetically covering the base plate;   a vapor chamber defined between the base plate and the top cover;   wick structures disposed in the vapor chamber;   working medium contained in the wick structures, wherein the wick structures comprise first and second wicks respectively attached to a top face of the base plate and a bottom face of the top cover; and   a plurality of artery meshes sandwiched between the first and the second wicks, the working medium being also contained in the plurality of artery meshes.   
   
   
       2 . The heat spreader as described in  claim 1 , wherein the plurality of artery meshes are symmetrically disposed in the vapor chamber. 
   
   
       3 . The heat spreader as described in  claim 1 , wherein the plurality of artery meshes comprise two artery meshes arranged at a middle portion of the heat spreader, and four artery meshes extending from a place near neighboring ends of the two artery meshes towards four corners of the heat spreader, respectively. 
   
   
       4 . The heat spreader as described in  claim 1 , wherein each of the plurality of artery meshes is a hollow tube, a channel being defined in a middle portion of the hollow tube and a plurality of pores being defined in a wall of the hollow tube. 
   
   
       5 . The heat spreader as described in  claim 4 , wherein a diameter of each of the plurality of artery meshes equals to a distance between the first and the second wicks. 
   
   
       6 . The heat spreader as described in  claim 4 , wherein a diameter of each of the plurality of artery meshes is in an approximate range from 0.5 mm to 2 mm. 
   
   
       7 . The heat spreader as described in  claim 4 , wherein each of the plurality of artery meshes is woven from a plurality of wires selected from copper wires, aluminum wires, stainless steel wires and fiber wires. 
   
   
       8 . The heat spreader as described in  claim 7 , wherein a diameter of the wire is 0.05 mm, a thickness of the wall of each of the plurality of artery meshes is 0.2 mm, and a diameter of the channel is 1 mm. 
   
   
       9 . The heat spreader as described in  claim 1 , wherein a thickness of the heat spreader is in an approximate range from 0.5 mm to 2 mm. 
   
   
       10 . The heat spreader as described in  claim 1 , wherein the first and second wicks are selected from mesh, fiber, fine grooves, sintered powder and carbon nanotube arrays. 
   
   
       11 . A heat dissipation apparatus comprising:
 a heat sink; and   a heat spreader on which the heat sink is mounted, comprising a heating area and a cooling area surrounding the heating area, and defining a vapor chamber therein, a plurality of artery meshes being arranged in the vapor chamber and extending from the heating area outwardly towards the cooling area, wherein a working medium is contained in the plurality of artery meshes.   
   
   
       12 . The heat dissipation apparatus as described in  claim 11 , further comprising first and second wicks disposed at top and bottom portions of the heat spreader respectively, the plurality of artery meshes being sandwiched between the first and the second wicks. 
   
   
       13 . The heat dissipation apparatus as described in  claim 12 , wherein the first and second wicks are selected from mesh, fiber, fine grooves, sintered powder and carbon nanotube arrays. 
   
   
       14 . The heat dissipation apparatus as described in  claim 11 , wherein each of the plurality of artery meshes is a hollow tube woven from a plurality of wires selected from copper wires, aluminum wires, stainless steel wires and fiber wires, a channel being defined in a middle portion of the hollow tube and a plurality of pores being defined in a wall of the hollow tube. 
   
   
       15 . The heat dissipation apparatus as described in  claim 14 , wherein a diameter of the wire is 0.05 mm, a thickness of the sidewall of each of the plurality of artery meshes is 0.2 mm, and a diameter of the channel is 1 mm. 
   
   
       16 . The heat dissipation apparatus as described in  claim 11 , wherein a diameter of each of the plurality of artery meshes is in an approximate range from 0.5 mm to 2 mm. 
   
   
       17 . The heat dissipation apparatus as described in  claim 1 , wherein a thickness of the heat spreader is in an approximate range from 0.5 mm to 2 mm. 
   
   
       18 . The heat dissipation apparatus as described in  claim 11 , wherein the heat sink has a plurality of fins. 
   
   
       19 . A heat dissipation apparatus, comprising:
 a heat spreader having a base plate and a top cover hermetically connected to the base plate, wherein wick structures are attached to a top face of the base plate and a bottom face of the top cover, respectively, at least an artillery mesh being located between the wick structures, contacting therewith and extending from a place near a middle portion of the heat spreader outward toward an edge of the heat spreader, wherein the artillery mesh is in a form of a flexible elongate hollow tube which is woven from a plurality of wires; and   a heat sink mounted on the top cover of the heat spreader and thermally connecting therewith.