Striking plate of a golf club head

Abstract

The present invention provides a striking plate having an outer surface and an inner surface. The outer surface serves as a striking face formed with a plurality of grooves, and the inner surface is a highly-polished face with a surface roughness below 6.3 μm so as to eliminate surface defects that may otherwise cause contraction of impact stress. The striking plate can be integrated with a sole plate and a crown plate into a golf club head.

what is claimed is:  
     
         1 . A striking plate for a golf club head, comprising an outer surface and an inner surface, said outer surface serving as a striking face, and said inner surface being a highly-polished face so as to eliminate surface defects in said inner surface and hence to improve fatigue endurance of said striking plate.  
     
     
         2 . The striking plate as claimed in  claim 1 , wherein said striking face is formed with a plurality of grooves.  
     
     
         3 . The striking plate as claimed in  claim 1 , wherein said highly-polished face is formed by electrolytic polishing.  
     
     
         4 . The striking plate as claimed in  claim 1 , wherein said highly-polished face is formed by chemical polishing.  
     
     
         5 . The striking plate as claimed in  claim 1 , wherein said highly-polished face is formed by shake-and-grind polishing.  
     
     
         6 . The striking plate as claimed in  claim 1 ,  3 ,  4  or  5 , wherein said highly-polished face has a surface roughness below 6.3 μm.  
     
     
         7 . The striking plate as claimed in  claim 1 ,  3 ,  4  or  5 , wherein said highly-polished face has a surface roughness below 3.5 μm.  
     
     
         8 . The striking plate as claimed in  claim 1 , wherein said is adapted to be integrated with a sole plate and a crown plate into said golf club head.  
     
     
         9 . The striking plate as claimed in  claim 8 , wherein said golf club head has an additional sleeve extending therefrom.