Heat sink

Abstract

A heat sink ( 10 ) includes a plurality of fins ( 12 ). Each of the fins includes a main body ( 122 ) and at least one bulge ( 126 ) disposed on the main body. The main bodies of two adjacent fins cooperatively define an air passage ( 121 ) therebetween, for allowing an airflow to pass therethough. The bulge has a varying projection height so as to form a streamline guide surface ( 127 ) thereon.

1 . A heat sink comprising: 
 a plurality of fins each comprising a main body and at least one bulge disposed on the main body, the main bodies of two adjacent fins cooperatively defining an air passage therebetween for allowing an airflow to pass therethough, the at least one bulge having a varying projection height so as to form a streamline guide surface thereon.    
   
   
       2 . The heat sink as described in  claim 1 , wherein the at least one bulge extends from the main body of the fin towards at least an adjacent fin.  
   
   
       3 . The heat sink as described in  claim 1 , wherein the projection height of the at least one bulge is gradually decreased from a center of the at least one bulge toward the joint of the at least one bulge and the main body.  
   
   
       4 . The heat sink as described in  claim 1 , wherein the profile of the joint between the at least one bulge and the main body is chosen from the group consisting of rhombus-shape, and ellipse-shape.  
   
   
       5 . The heat sink as described in  claim 1 , further comprising a heat pipe thermally connected with the fins.  
   
   
       6 . The heat sink as described in  claim 6 , wherein the at least one bulge extends from a corner of the main body of the fin towards an opposite corner adjacent to the heat pipe.  
   
   
       7 . The heat sink as described in  claim 1 , wherein the extension direction of the at least one bulge forms an obtuse angle to the flow direction of the airflow.  
   
   
       8 . The heat sink as described in  claim 1 , wherein the at least one bulge comprises more than one parallel bulge.  
   
   
       9 . The heat sink as described in  claim 1 , wherein the at least one bulge comprises more than one bulge having a different extension direction.  
   
   
       10 . A heat sink adapted for dissipating heat from a heat-generating electronic component comprising: 
 a plurality of fins each comprising a main body and at least one bulge extending from the main body, the at least one bulge having a projection height gradually decreased from a middle portion of the at least one bulge toward a periphery thereof.    
   
   
       11 . The heat sink as described in  claim 10 , further comprising a heat pipe thermally connected to the fins.  
   
   
       12 . The heat sink as described in  claim 11 , wherein the at least one bulge extends from a corner of the main body of the fin toward an opposite corner adjacent to the heat pipe.  
   
   
       13 . The heat sink as described in  claim 10 , wherein the profile of the periphery of the at least one bulge is selected from the group consisting of rhombus-shape and ellipse-shape.  
   
   
       14 . The heat sink as described in  claim 10 , wherein the at least one bulge has two arrow-shaped guide surfaces formed thereon.  
   
   
       15 . The heat sink as described in  claim 14 , wherein the two guide surfaces have acute corners pointed toward opposite directions and met with each other at a middle of the at least one bulge.  
   
   
       16 . A heat sink comprising: 
 a heat pipe having a first end section adapted for thermally connecting with a heat generating electronic component and a second end section; and    a plurality of fins stacked together, the second end section of the heat pipe extending through the fins and thermally connecting therewith, each of the fins having a main body with an elongated bulge thereon, wherein the elongated bulge extends from a corner of the main body toward the heat pipe.    
   
   
       17 . The heat sink of  claim 16 , wherein the bulge has a height gradually increased from a periphery thereof toward a center thereof.  
   
   
       18 . The heat sink of  claim 17 , wherein the main body comprises an additional bulge having a length smaller than that of the bulge and extending in a direction parallel to that of the bulge.  
   
   
       19 . The heat sink of  claim 18 , wherein the bulge has one of rhombus shape and ellipse shape.  
   
   
       20 . The heat sink of  claim 17 , wherein the main body comprises an additional bulge having a length smaller than that of the bulge and extending in a direction non-parallel to that of the bulge.