Heat sink

Abstract

A heat sink includes a heat conduction portion and a heat dissipation portion. The heat conduction portion contacts a heat source with a flat form. The heat dissipation portion is extended outward from at least one side of the thickness of the heat conduction portion and parallel to the heat conduction portion. The heat dissipation portion includes at least a first branch extended from the heat conduction portion and at least a second branch extended from the first branch.

What is claimed is: 
     
         1 . A heat sink, comprising:
 a heat conduction portion contacting a heat source with a flat form; and   a heat dissipation portion extended outward from at least one side of the thickness of the heat conduction portion and parallel to the heat conduction portion, and comprising:
 at least a first branch extended from the heat conduction portion; and 
 at least a second branch extended from the first branch. 
   
     
     
         2 . The heat sink as recited in  claim 1 , wherein the heat dissipation portion is extended substantially parallel to a surface of the heat source contacting the heat conduction portion. 
     
     
         3 . The heat sink as recited in  claim 2 , further comprising at least a bending portion formed between the heat conduction portion and the first branch. 
     
     
         4 . The heat sink as recited in  claim 3 , wherein the second branches extended from the two adjacent first branches are connected together. 
     
     
         5 . The heat sink as recited in  claim 4 , wherein at least a through hole is formed between the two adjacent first branches. 
     
     
         6 . The heat sink as recited in  claim 4 , wherein the heat dissipation portion is formed a wavy shape from a horizontal direction parallel to the heat conduction portion. 
     
     
         7 . The heat sink as recited in  claim 3 , wherein the heat dissipation portion is formed a ladder-like shape from a horizontal direction parallel to the heat conduction portion. 
     
     
         8 . The heat sink as recited in  claim 7 , wherein at least two of the first branches are not coplanar. 
     
     
         9 . The heat sink as recited in  claim 3 , wherein at least two of the second branches are disposed on different levels. 
     
     
         10 . The heat sink as recited in  claim 1 , wherein the first and second branches are coplanar. 
     
     
         11 . The heat sink as recited in  claim 1 , wherein the first and second branches have different thickness. 
     
     
         12 . The heat sink as recited in  claim 11 , wherein the second branches extended from the two adjacent first branches are connected together. 
     
     
         13 . The heat sink as recited in  claim 12 , wherein at least a through hole is formed between the two adjacent first branches. 
     
     
         14 . The heat sink as recited in  claim 1 , wherein the heat conduction portion and the heat dissipation portion are integrated into a single structure. 
     
     
         15 . The heat sink as recited in  claim 14 , wherein the height of the heat sink is between 0.5 mm and 6.5 mm. 
     
     
         16 . The heat sink as recited in  claim 1 , wherein at least a flow guiding structure is disposed in the space formed by a side of the heat source and a flat portion of the heat conduction portion contacting the heat source.