Radiation board

Abstract

A radiation board consists of a case and a lid. The case has a plurality of circulation channels formed on an inner wall. The lid seals the case to confine an operation fluid in the circulation channels of the case. The lid has miniature flutes corresponding to the circulation channels. Heat generated by a heat-generating element during operation is transferred through the lid to the operation fluid to vaporize the operation fluid. The miniature flutes help to condense the vaporized operation fluid into a liquid again. The operation fluid circulates in the case through the circulation channels to evenly distribute heat to the entire device. The radiation board is easy to fabricate at a low cost.

1 . A radiation board, comprising: 
 a case having a plurality of circulation channels formed on an inner wall to contain an operation fluid and a longitudinal strip between two neighboring circulation channels; and    a lid bonded to the longitudinal strip to seal one side of the case to confine the operation fluid in the case having a plurality of miniature flutes smaller than the circulation channels on one side thereof corresponding to the circulation channels;    wherein one side of the lid is mounted onto a heat generating element to transfer heat of the heat generating element to the operation fluid to cause a portion of the operation fluid to vaporize, the vaporized operation fluid being condensed to become liquid phase which circulates through the circulation channels to evenly distribute the heat absorbed by the operation fluid to the case and the lid.    
   
   
       2 . The radiation board of  claim 1 , wherein the case has a plurality of radiation fins on an outer surface to improve heat dissipation effect of the case.  
   
   
       3 . The radiation board of  claim 1 , wherein the miniature flutes have substantially a V-shape cross section.  
   
   
       4 . The radiation board of  claim 3 , wherein the V-shape cross section has an included angle about 60 degrees.  
   
   
       5 . The radiation board of  claim 1 , wherein the operation fluid is water.  
   
   
       6 . The radiation board of  claim 1 , wherein the operation fluid is acetone.  
   
   
       7 . The radiation board of  claim 1 , wherein the case further has cross channels to allow the neighboring circulation channels to communicate with one another.  
   
   
       8 . The radiation board of  claim 1 , wherein the miniature flutes are formed on the lid in a parallel manner.  
   
   
       9 . The radiation board of  claim 1 , wherein the circulation channels are formed in the case in a parallel manner.  
   
   
       10 . The radiation board of  claim 1 , wherein the surface of the miniature flutes is treated to become a coarse surface.