Golf club head

Abstract

A golf club head having a hollow structure and including a face, a body, and a weight portion is provided. The body includes a crown, a sole, and a hosel chamber. The crown, the sole, and the hosel chamber include laminated layers of a fiber-reinforced resin. The weight portion is formed of a material having a specific gravity greater than specific gravities of the crown and of the sole. The head volume is greater than or equal to 450 cc and less than or equal to 470 cc. The head weight is less than or equal to 200 g. The average thickness of each of the crown and the sole is greater than or equal to 0.7 mm. The weight of the weight portion is greater than or equal to 20 g, and the weight portion is attached to one or both of the crown and the sole.

What is claimed is: 
     
         1 . A golf club head having a hollow structure, the golf club head comprising:
 a face;   a body including at least a crown, a sole, and a hosel chamber, the crown, the sole, and the hosel chamber including laminated layers of a fiber-reinforced resin; and   a weight portion formed of a material having a specific gravity greater than specific gravities of the crown and of the sole, and disposed inward relative to a head shell,   wherein a head volume is greater than or equal to 450 cc and less than or equal to 470 cc,   wherein a head weight is less than or equal to 200 g,   wherein an average thickness of each of the crown and the sole is greater than or equal to 0.7 mm, and   wherein a weight of the weight portion is greater than or equal to 20 g, and the weight portion is attached to one or both of the crown and the sole.   
     
     
         2 . The golf club head according to  claim 1 , wherein a characteristic time (CT), corresponding to a coefficient of restitution of the face, is less than or equal to 257 μs. 
     
     
         3 . The golf club head according to  claim 1 , wherein the head weight is greater than or equal to 180 g, and the weight of the weight portion is greater than or equal to 30 g and less than or equal to 55 g. 
     
     
         4 . The golf club head according to  claim 1 , wherein the weight portion is not exposed to inside of and outside of the body. 
     
     
         5 . The golf club head according to  claim 1 , wherein the weight portion has a first surface and a second surface, the first surface contacting the head shell and the second surface not contacting the head shell,
 at least one layer of a fiber-reinforced resin is provided on the second surface, and   the at least one layer of the fiber-reinforced resin contacts one or both of an inner surface of the crown and an inner surface of the sole.   
     
     
         6 . The golf club head according to  claim 1 , wherein a maximum head height is greater than or equal to 60 mm, and a maximum head width is greater than or equal to 112 mm. 
     
     
         7 . The golf club head according to  claim 1 , wherein the weight of the weight portion is 20% or more of the head weight. 
     
     
         8 . The golf club head according to  claim 1 , wherein the sole includes a rib formed of a fiber-reinforced resin. 
     
     
         9 . A golf club head having a hollow structure, the golf club head comprising:
 a face;   a body including at least a crown, a sole, and a hosel chamber, the crown, the sole, and the hosel chamber including laminated layers of a fiber-reinforced resin; and   a weight portion formed of a material having a specific gravity greater than specific gravities of the crown and of the sole, and disposed inward relative to a head shell,   wherein a head volume is greater than or equal to 450 cc and less than or equal to 470 cc,   wherein a head weight is less than or equal to 180 g,   wherein an average thickness of each of the crown and the sole is greater than or equal to 0.7 mm, and   wherein a weight of the weight portion is greater than or equal to 10 g, and the weight portion is attached to one or both of the crown and the sole.   
     
     
         10 . The golf club head according to  claim 9 , wherein a characteristic time (CT), corresponding to a coefficient of restitution of the face, is less than or equal to 257 μs. 
     
     
         11 . The golf club head according to  claim 9 , wherein the head weight is greater than or equal to 160 g, and the weight of the weight portion is less than or equal to 35 g. 
     
     
         12 . The golf club head according to  claim 9 , wherein the weight portion is not exposed to inside of and outside of the body. 
     
     
         13 . The golf club head according to  claim 9 , wherein the weight portion has a first surface and a second surface, the first surface contacting the head shell and the second surface not contacting the head shell,
 at least one layer of a fiber-reinforced resin is included at the second surface, and   the at least one layer of the fiber-reinforced resin contacts one or both of an inner surface of the crown and an inner surface of the sole.   
     
     
         14 . The golf club head according to  claim 9 , wherein a maximum head height is greater than or equal to 60 mm, and a maximum head width is greater than or equal to 112 mm. 
     
     
         15 . The golf club head according to claim  9 , wherein a center-of-gravity angle is greater than or equal to 15 degrees and less than or equal to 40 degrees. 
     
     
         16 . The golf club head according to  claim 9 , wherein a center-of-gravity distance is greater than or equal to 35 mm and less than or equal to 45 mm. 
     
     
         17 . The golf club head according to  claim 9 , wherein a value obtained by dividing the weight of the weight portion by the head weight is greater than or equal to 0.09 and less than or equal to 0.19. 
     
     
         18 . The golf club head according to  claim 9 , wherein a value obtained by dividing a center-of-gravity distance by the head weight is greater than or equal to 0.21. 
     
     
         19 . The golf club head according to claim  9 , wherein a value obtained by dividing a center-of-gravity angle by the head weight is greater than or equal to 0.13 and less than or equal to 0.17. 
     
     
         20 . The golf club head according to  claim 9 , wherein the sole includes a rib formed of a fiber-reinforced resin.