Abstract: A golf club includes a reinforcing member installed on an inner circumferential surface of a shaft near a tip-side end portion and extends in an axial direction of the shaft to straddle an upper end of a cylindrical portion. The reinforcing member has a cylindrical shape configured by laminating prepregs obtained by impregnating carbon fibers being reinforcing fibers with a matrix resin. The reinforcing member is provided with: a first bias layer located at the innermost side in a radial direction; a second bias layer laminated on an outer side of the first bias layer (16A) in the radial direction, an orientation direction of the reinforcing fibers having an opposite direction to the first bias layer; and a straight layer laminated on the outer side of the second bias layer in the radial direction, an orientation direction of the reinforcing fibers being parallel to the axial direction of the shaft.

Abstract: A golf club includes a reinforcing member installed on an inner circumferential surface of a shaft near a tip-side end portion and extends in an axial direction of the shaft to straddle an upper end of a cylindrical portion. The reinforcing member has a cylindrical shape configured by laminating prepregs obtained by impregnating carbon fibers being reinforcing fibers with a matrix resin. The reinforcing member is provided with: a first bias layer located at the innermost side in a radial direction; a second bias layer laminated on an outer side of the first bias layer (16A) in the radial direction, an orientation direction of the reinforcing fibers having an opposite direction to the first bias layer; and a straight layer laminated on the outer side of the second bias layer in the radial direction, an orientation direction of the reinforcing fibers being parallel to the axial direction of the shaft.

Abstract: A golf club head of the present invention includes a face portion having an impact surface that impacts a golf ball and is made from a metallic material, and a crown portion, a heel portion, a sole portion, and the toe portion that are adjacent to the face portion. In at least two portions from among the crown portion, the heel portion, the sole portion, and the toe portion, at least one from among dissimilar metallic materials that differ from the metallic material of the impact surface and fiber reinforced plastic materials is used in regions along ends that are adjacent to the face portion, within a range of 30 mm from the adjacent ends. Thereby, the golf club has a structure that easily deforms with respect to golf ball impacts, and the face portion deforms more than conventional face portions. The coeffecient of restitution of a struck golf ball therefore increases, the initial velocity of the golf ball increases, and the carry distance increases.

Abstract: A golf club head and a golf club provided with the golf club head. The head has outer shell structure portions including a hosel portion, a face portion, a sole portion, a crown portion, and a side portion and a joining portion where a crown member used in the crown portion is bonded to a member used in another outer shell structure portion. The member to be used as the crown member has an equivalent rigidity not more than 0.8 times as high as that of a sole member used in the sole portion where the equivalent rigidity of a member used in any one of the outer shell structure portions is defined as the product of the thickness of the relevant member and the elastic modulus of the member in a direction in which a golf ball-striking surface of the face portion is oriented.

Abstract: A golf club head has a ratio of a head mass to a head volume equal to or grater than 3 g/cm2, and a face portion that includes an impact surface is configured by a member made from an aluminum alloy having a maximum tensile strength equal to or greater than 600 MPa. The aluminum alloy is made by using a rapid quenching method. The golf club head can improve the carry distance and the flight direction characteristics of a hit golf ball compared with a conventional golf club head.

Abstract: A hollow golf club head allowing to increase the repulsion and the degree of design freedom, while maintaining the durability. A hollow golf club head having a head body formed from a metal, wherein a hole is formed in the vicinity of the middle of a crown portion in the head body, the hole is closed with a cover member made of a material different from the head body, and the ratio (?m/?t) of the specific gravity ?m of the head body and the specific gravity ?f of the cover member is set equal or superior to 1.3.

Abstract: A hollow golf club head allowing to increase the repulsion and the degree of design freedom, while maintaining the durability. A hollow golf club head having a head body formed from a metal, wherein a hole is formed in the vicinity of the middle of a crown portion in the head body, the hole is closed with a cover member made of a material different from the head body, the ratio (?m/?f) of the specific gravity ?m of the head body and the specific gravity ?f of the cover member is set equal or superior to 1.3, and the ratio of the face area of a portion where the reinforcement and the head body are combined to the face area of the head body is set equal or superior to 20%.

Abstract: A hollow golf club head enables to increase the bonding strength of an outer shell member made of metal and an outer shell member made of fiber reinforced plastic. The hollow golf club head comprises a hollow golf club having a head body of a hollow structure formed by bonding the metallic outer shell member and the fiber reinforced plastic outer shell member, wherein the fiber reinforced plastic outer shell member is bonded to both faces of the bonding portion of the metallic outer shell member.

Abstract: A hollow golf club head enables to increase the bonding strength of an outer shell member made of metal and an outer shell member made of fiber reinforced plastic. The hollow golf club head comprises a hollow golf club having a head body of a hollow structure formed by bonding the metallic outer shell member and the fiber reinforced plastic outer shell member, wherein the fiber reinforced plastic outer shell member is bonded to both faces of the bonding portion of the metallic outer shell member.

Abstract: A hollow golf club head allowing to increase the repulsion and the degree of design freedom, while maintaining the durability. A hollow golf club head having a head body formed from a metal, wherein a hole is formed in the vicinity of the middle of a crown portion in the head body, the hole is closed with a cover member made of a material different from the head body, the ratio (?m/?f) of the specific gravity ?m of the head body and the specific gravity ?f of the cover member is set equal or superior to 1.3, and the ratio of the face area of a portion where the reinforcement and the head body are combined to the face area of the head body is set equal or superior to 20%.

Abstract: A hollow golf club head allowing to increase the repulsion and the degree of design freedom, while maintaining the durability. A hollow golf club head having a head body formed from a metal, wherein a hole is formed in the vicinity of the middle of a crown portion in the head body, the hole is closed with a cover member made of a material different from the head body, and the ratio (?m/?t) of the specific gravity ?m of the head body and the specific gravity ?f of the cover member is set equal or superior to 1.3.

Abstract: A hollow golf club head enables to increase the bonding strength of an outer shell member made of metal and an outer shell member made of fiber reinforced plastic. The hollow golf club head comprises a hollow golf club having a head body of a hollow structure formed by bonding the metallic outer shell member and the fiber reinforced plastic outer shell member, wherein the fiber reinforced plastic outer shell member is bonded to both faces of the bonding portion of the metallic outer shell member.

Abstract: A hollow golf club head enables to increase the bonding strength of an outer shell member made of metal and an outer shell member made of fiber reinforced plastic. The hollow golf club head comprises a hollow golf club having a head body of a hollow structure formed by bonding the metallic outer shell member and the fiber reinforced plastic outer shell member, wherein the fiber reinforced plastic outer shell member is bonded to both faces of the bonding portion of the metallic outer shell member.

Abstract: A hollow golf club head enables to increase the bonding strength of an outer shell member made of metal and an outer shell member made of fiber reinforced plastic. The hollow golf club head comprises a hollow golf club having a head body of a hollow structure formed by bonding the metallic outer shell member and the fiber reinforced plastic outer shell member, wherein the fiber reinforced plastic outer shell member is bonded to both faces of the bonding portion of the metallic outer shell member.

Abstract: A hollow golf club head allowing to increase the repulsion and the degree of design freedom, while maintaining the durability. A hollow golf club head having a head body formed from a metal, wherein a hole is formed in the vicinity of the middle of a crown portion in the head body, the hole is closed with a cover member made of a material different from the head body, and the ratio (?m/?f) of the specific gravity ?m of the head body and the specific gravity ?f of the cover member is set equal or superior to 1.3.

Abstract: The inner surface of the hollow portion of the golf club head according to the present invention includes either or both of a concave surface and a flat surface. On the other hand, the projecting portion provided on the inner surface of the hollow portion, if any, is so formed that it has a convex surface with a radius of curvature equal to or greater than 3 mm, or chamfered at a level of C3 or more (JIS B0701-1987 standard). Owing to such structure, the golf club head can be manufactured with good efficiency even if the molding is performed using a bladder because the rate of molding failure upon such molding is reduced while the characteristics of the golf club head are ensured. The golf club of the present invention has such a golf club head as above.

Abstract: The golf club head of the present invention comprises outer shell structure portions including a hosel portion, a face portion, a sole portion, a crown portion, and a side portion; and a joining portion where a crown member used in the crown portion is bonded to a member used in another outer shell structure portion. The member to be used as the crown member has an equivalent rigidity not more than 0.8 times as high as that of a sole member used in the sole portion where the equivalent rigidity of a member used in any one of the outer shell structure portions is defined as the product of the thickness of the relevant member and the elastic modulus of the member in a direction in which a golf ball-striking surface of the face portion is oriented.

Abstract: A golf club head of the present invention includes a face portion having an impact surface that impacts a golf ball and is made from a metallic material, and a crown portion, a heel portion, a sole portion, and a toe portion that are adjacent to the face portion. In at least two portions from among the crown portion, the heel portion, the sole portion, and the toe portion, at least one from among dissimilar metallic materials that differ from the metallic material of the impact surface and fiber reinforced plastic materials is used in regions along ends that are adjacent to the face portion, within a range of 30 mm from the adjacent ends. Thereby, the golf club has a structure that easily deforms with respect to golf ball impacts, and the face portion deforms more than conventional face portions. The coefficient of restitution of a struck golf ball therefore increases, the initial velocity of the golf ball increases, and the carry distance increases.

Abstract: A hollow golf club head allowing to increase the repulsion and the degree of design freedom, while maintaining the durability. A hollow golf club head having a head body formed from a metal, wherein a hole is formed in the vicinity of the middle of a crown portion in the head body, the hole is closed with a cover member made of a material different from the head body, the ratio (?m/?f) of the specific gravity ?m of the head body and the specific gravity ?f of the cover member is set equal or superior to 1.3, and the ratio of the face area of a portion where the reinforcement and the head body are combined to the face area of the head body is set equal or superior to 20%.

Abstract: Provided is a hollow golf club head capable of improving repulsion and degree of design freedom compared to the case where a golf club head is formed using only a single metallic material, by combining different kinds of materials as component materials of a face section. The face section of the hollow golf club head is made of a composite material in which metal and fiber-reinforced plastic are combined. For example, in the hollow golf club head comprising a plate member disposed on the face section, the plate member is partially made of fiber-reinforced plastic in a plane direction and the remainder of said plate member is made of metal.