Method for forming carbon fiber layer

Abstract

A method for producing a carbon fiber composite layer having high strength is provided. The method includes steps of providing two carbon fibers layers having fibers in parallel with each other and disposed in a stacked form, and heating and pressing said two carbon layers simultaneously to form said carbon fiber composite layer. A structure of an acoustic diaphragm adapted to be used in a planar diaphragm speaker is also provided. The structure includes a bottom carbon fiber layer and a top carbon fiber layer disposed on the bottom carbon fiber layer, wherein the fibers of the top carbon fiber layer and the fibers of the bottom carbon fiber layer are parallel with each other.

What is claimed is:  
     
         1 . A method for producing a carbon fiber composite layer having high strength, comprising steps of: 
 providing two carbon fibers layers having fibers in parallel with each other and disposed in a stacked form; and    heating and pressing said two carbon layers simultaneously to form said carbon fiber composite layer.    
     
     
         2 . The method according to    claim 1   , wherein said heating and pressing step is carried out at about 130° C. under 300 psia for 60 minutes.  
     
     
         3 . The method according to    claim 1   , further comprising a first vibration absorber layer between said top carbon fiber layer and said bottom carbon fiber layer.  
     
     
         4 . The method according to    claim 1   , further comprising a second vibration absorber layer disposed on said top carbon fiber layer and a third vibration absorber layer disposed under said bottom carbon fiber layer.  
     
     
         5 . The method according to    claim 1   , wherein each of said first vibration absorber layer, said second vibration absorber layer and said third vibration absorber layer is high-density polyethylene (HDPE).  
     
     
         6 . The method according to    claim 1   , wherein the thickness of said top carbon fiber layer is about 0.1 mm.  
     
     
         7 . The method according to    claim 1   , wherein the thickness of said bottom carbon fiber layer is about 0.1 mm.  
     
     
         8 . A structure of an acoustic diaphragm adapted to be used in a planar diaphragm speaker, comprising: 
 a bottom carbon fiber layer; and    a top carbon fiber layer disposed on said bottom carbon fiber layer,    wherein the fibers of said top carbon fiber layer and the fibers of said bottom carbon fiber layer are parallel with each other.    
     
     
         9 . The structure according to    claim 8   , further comprising a first vibration absorber layer between said top carbon fiber layer and said bottom carbon fiber layer.  
     
     
         10 . The structure according to    claim 9   , further comprising a second vibration absorber layer disposed on said top carbon fiber layer and a third vibration absorber layer disposed under said bottom carbon fiber layer.  
     
     
         11 . The structure according to    claim 10   , wherein each of said first vibration absorber layer, said second vibration absorber layer and said third vibration absorber layer is high-density polyethylene (HDPE).  
     
     
         12 . The structure according to    claim 8   , wherein the thickness of said top carbon fiber layer is about 0.1 mm.  
     
     
         13 . The structure according to    claim 1   , wherein the thickness of said bottom carbon fiber layer is about 0.1 mm.  
     
     
         14 . A structure of an acoustic diaphragm adapted to be used in a planar diaphragm speaker, comprising: 
 a bottom carbon fiber layer having a first fiber direction;    a first vibration absorber layer disposed on said bottom carbon fiber layer; and    a top carbon fiber layer disposed on said bottom carbon fiber layer and has a second fiber direction,    wherein said first fiber direction and said second fiber direction are parallel with each other.    
     
     
         15 . The structure according to    claim 14   , further comprising a second vibration absorber layer disposed on said top carbon fiber layer and a third vibration absorber layer disposed under said bottom carbon fiber layer.  
     
     
         16 . The structure according to    claim 15   , wherein each of said first vibration absorber layer, said second vibration absorber layer and said third vibration absorber layer is high-density polyethylene (HDPE).  
     
     
         17 . The structure according to    claim 14   , wherein the thickness of said top carbon fiber layer is about 0.1 mm.  
     
     
         18 . The structure according to    claim 14   , wherein the thickness of said bottom carbon fiber layer is about 0.1 mm.