Composite magnetic sheet and method of producing the same

Abstract

A composite magnetic body is produced from flat soft magnetic powder subjected to annealing to be free from stress strain is prepared and mixed with a binder and a solvent for dissolving the binder to form a slurry-like mixture. The mixture is formed into a film. Then, the solvent is removed. Thus, a sheet of the composite magnetic body is produced.

1 - 16 . (canceled)  
     
     
         17 . A composite magnetic body produced by the steps of: 
 preparing flat soft magnetic powder;    subjecting said flat soft magnetic powder to annealing to be free from stress strain;    mixing, after the annealing step, said flat soft magnetic powder with a binder and a solvent suitable for processing said binder, the mixing step producing a slurry-like mixture;    forming said slurry-like mixture into a desired geometry to produce a green article; and    removing said solvent from green article to produce said composite magnetic body.    
     
     
         18 . The composite magnetic body of  claim 17 , wherein the desired geometry is a film or sheet.  
     
     
         19 . A composite magnetic body produced by the steps of: 
 preparing flat soft magnetic powder;    subjecting said flat soft magnetic powder to annealing to be free from strain;    mixing, after the annealing step, said flat soft magnetic powder, a binder comprising chlorinated polyethylene, and a solvent, said solvent suitable for further processing said binder, to produce a slurry-like mixture;    forming said slurry-like mixture into a desired geometry to produce a green article; and    removing said solvent from said green article to produce said composite magnetic body.    
     
     
         20 . The composite magnetic body of  claim 18 , wherein the desired geometry is a planar.  
     
     
         21 . The composite magnetic body of  claim 21 , wherein the body is a film or sheet.  
     
     
         22 . A composite magnetic body having a magnetic powder reduced in stress strain, produced by the steps of: 
 preparing flat soft magnetic powder;    subjecting said flat soft magnetic powder to annealing to be free from strain;    mixing, after the annealing step, said flat soft magnetic powder, a binder, and a solvent suitable for dissolving said binder, the mixing step producing a slurry-like mixture;    forming said slurry-like mixture into a green article of a planar geometry;    removing said solvent from said green article to produce a planar composite magnetic body; and    pressing said planar body in a direction perpendicular to the plane without inducing stress strain in said powder.    
     
     
         23 . The composite magnetic body of  claim 22 , wherein the body is in the form of a sheet.  
     
     
         24 . A composite magnetic member, comprising: 
 a planar conductive material defining opposing planar surfaces; and    two composite magnetic bodies, each of said bodies being a body as defined in  claim 17 ,  18 ,  19 ,  20 ,  21 ,  22 , or  23 , at least one body arranged on each of said opposing planar surfaces.    
     
     
         25 . A composite magnetic member as claimed in  claim 24 , wherein each of said bodies is the product as defined by in  claim 17 .  
     
     
         26 . A composite magnetic member as claimed in  claim 25 , wherein each of said bodies is the product as defined in  claim 18 .  
     
     
         27 . A composite magnetic member as claimed in  claim 24 , wherein each of said bodies is the product as claimed in  claim 19 .  
     
     
         28 . A composite magnetic member as claimed in  claim 27 , wherein each of said bodies is the product as claimed in  claim 21 .  
     
     
         29 . A composite magnetic member as claimed in  claim 24 , wherein each of said bodies is the product as claimed in  claim 22 .  
     
     
         30 . A composite magnetic member as claimed in  claim 29 , wherein each of said bodies is the product as claimed in  claim 23.