Method for manufacturing front sheet and microwave oven having the same

Abstract

The present invention relates to a front sheet of a microwave oven and a method for manufacturing the front sheet. The method for manufacturing the front sheet of the microwave oven according to the present invention comprises a first process including a chemical polishing process of removing foreign materials from and polishing a surface of an aluminum sheet so as to give a predetermined luster thereto; a process of forming a porous anodic oxide film onto the surface of the aluminum sheet; a process of dipping the aluminum sheet into a solution containing a dye and penetrating the dye into a porous film of the anodic oxide film; and a process of sealing the porous film into which the dye has been penetrated. The microwave oven according to the present invention includes a colored front sheet manufactured by anodizing and dyeing the surface of the aluminum sheet and attached to a front face of a door portion or a control panel portion of the microwave oven.

What is claimed is:  
     
         1 . A method for manufacturing a front sheet of a microwave oven, comprising: 
 a first process including a chemical polishing process of removing foreign materials from and polishing a surface of an aluminum sheet so as to give a predetermined luster thereto;    a process of forming a porous anodic oxide film onto said surface of said aluminum sheet;    a process of dipping said aluminum sheet into a solution containing a dye and penetrating said dye into a porous film of said anodic oxide film; and    a process of sealing said porous film into which said dye is penetrated.    
     
     
         2 . The method for manufacturing a front sheet of a microwave oven as claimed in  claim 1 , further comprising a texture treatment process of surface treating said aluminum sheet in order to give a predetermined texture to said surface of said aluminum sheet prior to said first process.  
     
     
         3 . The method for manufacturing a front sheet of a microwave oven as claimed in  claim 1 , wherein said first process comprises the steps of removing organic contaminants from said surface by using an organic solvent, and of polishing said surface of said aluminum sheet by using a chemical solution containing phosphoric acid, sulfuric acid and nitric acid.  
     
     
         4 . The method for manufacturing a front sheet of a microwave oven as claimed in  claim 3 , further comprising removing foreign materials from said surface of said aluminum sheet by using an alkaline solution.  
     
     
         5 . A microwave oven, comprising: 
 a colored front sheet manufactured by anodizing and dyeing a surface of an aluminum sheet and attached to a front face of a door portion or a control panel portion of said microwave oven.    
     
     
         6 . The microwave oven as claimed in  claim 5 , wherein said front sheet is constructed to wrap around at least a portion of a front side, opposite lateral sides, and upper and lower sides of said door portion of said microwave oven.  
     
     
         7 . The microwave oven as claimed in  claim 5  or  6 , wherein said front sheet is attached to said front face by using an adhesive.  
     
     
         8 . The microwave oven as claimed in  claim 5  or  6 , wherein said front sheet is attached by coupling mounting projections formed on upper and lower portions of said door portion or said control panel portion with mounting holes formed on said front sheet at positions corresponding thereto, or by using an adhesive therebetween.  
     
     
         9 . The microwave oven as claimed in  claim 6 , wherein edge portions, where said front side joins with said lateral sides and said upper and lower sides, respectively, are treated to have predetermined rounded shapes.