Iron type golf club head

Abstract

An iron type golf club head includes a hitting face that has a plurality of score lines and a face center, a back surface, a sole surface, a top blade and a face thickness. On the back surface, a thick wall portion is formed over a region including a score line center position, the thick wall portion having a face thickness of greater than that of a part on the toe side thereof and greater than that of a part on the heel side thereof. The thick wall portion is formed such that it extends toward the toe side as it goes toward the blade side from the sole side. The iron type golf club head has a loft angle of greater than or equal to 46°. The face thickness is defined as a distance between the hitting face and the back surface.

What is claimed is: 
     
         1 . An iron type golf club head comprising:
 a hitting face that includes a plurality of score lines and a face center;   a back surface;   a sole surface;   a top blade; and   a face thickness that is defined as a distance between the hitting face and the back surface, wherein   on the back surface, a thick wall portion is formed over a region including a score line center position, the thick wall portion having a face thickness of greater than the face thickness of a part on a toe side of the thick wall portion and greater than the face thickness of a part on a heel side of the thick wall portion,   the thick wall portion is formed such that it extends toward the toe side as it goes toward a blade side from a sole side, and   the golf club head has a loft angle of greater than or equal to 46°.   
     
     
         2 . The golf club head according to  claim 1 , wherein
 the face thickness of the thick wall portion decreases toward the blade side.   
     
     
         3 . The golf club head according to  claim 1 , wherein
 the thick wall portion is disposed over a region that includes the face center.   
     
     
         4 . The golf club head according to  claim 1 , further includes an upper thick wall portion that is thicker than an upper end of the thick wall portion and is located on the blade side of the thick wall portion. 
     
     
         5 . The golf club head according to  claim 1 , wherein
 when a thick wall portion region obtained by projecting the thick wall portion onto the hitting face is divided into the following four parts: a heel upper part that is located on the heel side and blade side with respect to the face center; a toe upper part that is located on the toe side and blade side with respect to the face center; a toe lower part that is located on the toe side and sole side with respect to the face center; and a heel lower part that is located on the heel side and sole side with respect to the face center,   an area of the toe upper part is greater than an area of the heel upper part, is greater than an area of the toe lower part, and is greater than an area of the heel lower part.   
     
     
         6 . The golf club head according to  claim 1 , wherein
 when a thick wall portion region obtained by projecting the thick wall portion onto the hitting face includes a heel upper part that is located on the heel side and blade side with respect to the face center, and a toe upper part that is located on the toe side and blade side with respect to the face center,   an area of the toe upper part is greater than or equal to two times an area of the heel upper part.   
     
     
         7 . The golf club head according to  claim 1 , wherein
 when a thick wall portion region obtained by projecting the thick wall portion onto the hitting face is divided into the following two parts: an upper part that is located on the blade side with respect to the face center; and a lower part that is located on the sole side with respect to the face center,   an area of the upper part is greater than an area of the lower part.   
     
     
         8 . The golf club head according to  claim 1 , wherein
 when a thick wall portion region obtained by projecting the thick wall portion onto the hitting face is divided into the following two parts: a toe part that is located on the toe side with respect to the face center; and a heel part that is located on the heel side with respect to the face center,   an area of the toe part is greater than an area of the heel part.   
     
     
         9 . The golf club head according to  claim 1 , wherein
 the golf club head is produced by forging.   
     
     
         10 . A golf club comprising the golf club head according to  claim 1 , a shaft and a grip. 
     
     
         11 . A golf club set comprising two or more golf clubs according to  claim 10 , wherein
 the greater the loft angle is, the larger an area of the thick wall portion is.