Patent ID: 6776726
Filing Date: 2004-08-17
Classification: A63B

Abstract:
A golf club head comprising:a face plate made of a metal material and defining a ball striking face, said ball striking face provided with a central region having a surface hardness and a peripheral region surrounding the central region and having a surface hardness, wherein the surface hardness is measured on the ball striking face according to a test method specified in the Japanese Industrial Standard Z2244 â€œVickers hardness testâ€  under a load of 50 gf ( 0.4903N) and a holding time of ten seconds, wherein said surface hardness of the central region is in a range of 250 to 600 Hv, and said surface hardness of the peripheral region is in a range of from 0.45 to 0.90 times the surface hardness of the central region.