Patent ID: 7303487
Filing Date: 2007-12-04
Classification: A63B

Abstract:
1. A golf club head comprising: a face portion hitting a ball; a crown portion connected to the face portion and forming an upper surface of the head; a sole portion connected to said face portion and forming a head bottom surface; a side portion extending between said crown portion and said sole portion from a toe of the face portion through a back face to a heel, and a neck portion having a shaft insertion hole, wherein the golf club head includes a head base body made of a metal material and provided with at least one opening portion, and a cover body arranged in said opening portion and made of a lower specific gravity material having a specific gravity smaller than said metal material, said head base body including said face portion, said neck portion, a crown main wall portion forming a main portion of said crown portion, a sole main wall portion forming a main portion of said sole portion, and a side main wall portion forming a main portion of said side portion, wherein said opening portion includes at least one of a crown opening portion open in said crown portion, a side opening portion open in said side portion and a sole opening portion open in said sole portion, wherein in a head toe side portion and a head heel side portion obtained by virtually sectioning the head by a vertical surface including a normal line drawn from the center of gravity of the head to the face surface in a standard state of being mounted on a horizontal surface at prescribed lie angle and loft angle, a surface area St of a portion of said cover body closing a portion of said opening portion which is located in said head toe side portion is made larger than a surface area Sh of the remaining portion of said cover body closing a portion of said opening portion which is located in said head heel side portion, and a weight Wh of the head heel side portion is set to 55 to 75% of the entire weight of the head, and wherein the shortest distance from the head's center of gravity to the axial center line of said shaft insertion hole is from 20 to 45 mm.