Golf club head
A golf club head includes a striking face, a crown and a sole. The crown and/or the sole includes an FRP member formed by a fiber reinforced plastic that contains a fiber and a matrix resin. The FRP member has an average flexural modulus of greater than or equal to 25 GPa. The fiber may contain a carbon fiber. The carbon fiber may have a tensile elastic modulus of greater than or equal to 300 GPa. The fiber may contain a metallic fiber. The FRP member may have a resin content of less than or equal to 40% by weight. The matrix resin may have a glass transition temperature of higher than or equal to 150° C.
1. A golf club head comprising:
a striking face;
a crown; and
a sole, wherein
the crown and/or the sole includes an FRP member formed by a fiber reinforced plastic that contains a fiber and a matrix resin,
the FRP member has an average flexural modulus of greater than or equal to 25 GPa, and a ratio of an area of the FRP member to an area of the crown is greater than or equal to 40%.
2. The golf club head according to claim 1 , wherein
the fiber contains a carbon fiber, and
the carbon fiber has a tensile elastic modulus of greater than or equal to 300 GPa.
3. The golf club head according to claim 1 , wherein
the FRP member has a resin content of less than or equal to 40% by weight.
4. The golf club head according to claim 1 , wherein
the matrix resin has a glass transition temperature of higher than or equal to 150° C.
5. The golf club head according to claim 1 , wherein
the golf club head has a weight of greater than or equal to 175 g and less than or equal to 225 g,
the golf club head has a volume of greater than or equal to 400 cc, and
the golf club head has a left-and-right moment of inertia of greater than or equal to 450×10 −6 kg·m 2 .
6. The golf club head according to claim 1 , wherein
the FRP member has a weight of less than or equal to 20 g.
7. The golf club head according to claim 1 , wherein
the FRP member is provided on the crown, and
the FRP member has a thickness of less than or equal to 0.8 mm.
8. The golf club head according to claim 1 , wherein
the FRP member is provided on the crown, and
the golf club head has a depth of a center of gravity of greater than or equal to 20 mm.
9. The golf club head according to claim 1 , wherein
the FRP member is provided on the sole, and
the FRP member has a thickness of less than or equal to 1.0 mm.
10. The golf club head according to claim 1 , wherein
the average flexural modulus is an average value of a flexural modulus in a 0-degree direction and a flexural modulus in a 90-degree direction, the 0-degree direction being a face-back direction, and the 90-degree direction being a toe-heel direction.
11. The golf club head according to claim 1 , wherein
the golf club head further comprises a head body that includes an opening and is made of a metal,
the opening is disposed in the crown or the sole, or extends from the sole into the crown, and
the FRP member covers the opening.
12. The golf club head according to claim 11 , wherein
the fiber contains a carbon fiber and a metallic fiber.
13. The golf club head according to claim 12 , wherein
the matrix resin has a glass transition temperature of higher than or equal to 150° C.
14. The golf club head according to claim 13 , wherein
the carbon fiber has a tensile elastic modulus of greater than or equal to 300 GPa.
15. The golf club head according to claim 14 , wherein
the FRP member has a resin content of less than or equal to 40% by weight.
16. A golf club head comprising:
a striking face;
a crown; and
a sole, wherein
the crown and/or the sole includes an FRP member formed by a fiber reinforced plastic that contains a fiber and a matrix resin,
the FRP member has an average flexural modulus of greater than or equal to 25 GPa, and
the fiber contains a metallic fiber.