Golf club head

Abstract

This invention discloses a golf club head which has a hollow shell structure and includes a face portion, a sole portion, a crown portion, a back portion, a toe-side side portion, and a heel-side side portion. A ratio R/H×100% is 5% to 20%, where R is the radius of curvature of the upper corner edge on which the face portion and the crown portion intersect with each other, and H is the maximum head height.

1 . A golf club head which has a hollow shell structure and includes a face portion, a sole portion, a crown portion, a back portion, a toe-side side portion, and a heel-side side portion, wherein
 a ratio R/H×100% is 5% to 20%, where R is a radius of curvature of an upper corner edge on which the face portion and the crown portion intersect with each other, and H is a maximum head height.   
     
     
         2 . The head according to  claim 1 , wherein the ratio is 10% to 15%. 
     
     
         3 . The head according to  claim 1 , wherein
 in a longitudinal sectional view taken along a line which runs in a front-to-back direction and passes the face center,   when a contact point between the upper corner edge and a tangent to an outer surface of the upper corner edge, which is inclined by 45° backwards from a vertical direction, is defined as A,   a point on an upper edge of the face portion is defined as B, and   a point C which forms a line segment AC having a length equal to a length of a line segment AB is set on a side of the crown portion,   the radius of curvature is equal to a radius of curvature R of an arc which passes through the points B, A, and C.