Golf club head

Abstract

A golf club head having a hollow internal structure, of which a face portion includes, on its internal surface, an intersection portion located in the central portion of the face portion, a C-shaped outer peripheral portion having an opening on the side of a hosel portion, four main ribs extending from the intersection portion up to an outer edge of the face portion, and an intermediate portion located between the intermediate portion and the outer peripheral portion and the hosel portion. The intermediate portion is divided to four areas by the four main ribs. The thicknesses of a toe side area and a heel side area are greater than the thickness of the outer peripheral portion, and the thicknesses of a crown side area and a sole side area are less than the thickness of the outer peripheral portion.

1 . A golf club head having a hollow internal structure, comprising a face portion, a crown portion, a sole portion, and a hosel portion,
 wherein the face portion comprises, on an internal surface, a central portion of the face portion, a C-shaped outer peripheral portion having an opening on the side of the hosel portion, at least four main ribs extending from the central portion to an outer edge of the face portion and an intermediate portion located between the central portion and the outer peripheral portion or the hosel portion,   wherein the intermediate portion is divided into at least four areas: toe side area, heel side area, crown side area and sole side area with the at least four main ribs,   wherein the thicknesses of the toe side area and the heel side area in the intermediate portion are greater than the thickness of the outer peripheral portion and the thicknesses of the crown side area and the sole side area in the intermediate portion are less than the outer peripheral portion.   
     
     
         2 . The golf club head according to  claim 1 , wherein the thickness of the crown side area of the intermediate portion is defined to be greater than the thickness of the sole side area of the intermediate portion. 
     
     
         3 . The golf club head according to  claim 1 , wherein the thickness of the heel side area of the intermediate portion is defined to be greater than the thickness of the toe side area of the intermediate portion. 
     
     
         4 . The golf club head according to  claim 1 , wherein the face portion comprises, on the internal surface, a reinforcement rib extending from the central portion toward the outside of the face portion.