Abstract: A golf club includes a head; a shaft; and a grip, wherein the head includes a front member and a back member detachably mounted to the front member.

Abstract: A golf club c1 has a base part 2, a laser discoloration layer 6, and a protection layer 8. The laser discoloration layer 6 is provided on the outer side of the base part 2. The protection layer 8 is provided on the outer side of the laser discoloration layer 6. The protection layer 8 has laser beam transparency. The laser discoloration layer 6 can be discolored by irradiation of a laser beam. Preferably, an undercoat layer 4 is further provided between the base part 2 and the laser discoloration layer 6. Preferably, the undercoat layer 4 is not discolored by the laser beam. Preferably, the laser discoloration layer 6 includes abase material resin and a laser discoloration material.

Abstract: A golf club includes a head having a plurality of holding holes and a hosel part, the hosel part having a sleeve insertion hole; a shaft; a sleeve, the sleeve being inserted into the sleeve insertion hole and bonded to the shaft, the sleeve having a screw hole; and a connecting member having a screw part inserted into the screw hole of the sleeves and forms a screw-connection of the sleeve and the connecting member, wherein the shaft is configured to be fixed along one of a plurality of shaft axis lines by positioning the connecting member in one of the plurality of holding holes such that a lie angle is adjustable to be along one of the plurality of shaft axis lines.

Abstract: A head of a first aspect is provided with a head body h1x, a double-stick tape t1, and an adherend s1x bonded to the head body h1x by the double-stick tape t1. The double-stick tape t1 has a first adhesive layer 30 provided as an innermost layer, a second adhesive layer 36 provided as an outermost layer, and intermediate layers 32 and 34 provided between the first adhesive layer 30 and the second adhesive layer 36. The intermediate layer includes a fiber layer 34 and/or a resin layer 32. The resin layer 32 is free of bubbles. In a head of a second aspect, a head body h1y or an adherend s1y has a recessed part 27y. In a head of a third aspect, an adherend s1 has a metal member 27 and an elastic member 29. The elastic member 29 has a peripheral part 29a directly or indirectly abutting on a side surface 31 of the metal member 27.

Abstract: A golf club c1 has a base part 2, a laser discoloration layer 6, and a protection layer 8. The laser discoloration layer 6 is provided on the outer side of the base part 2. The protection layer 8 is provided on the outer side of the laser discoloration layer 6. The protection layer 8 has laser beam transparency. The laser discoloration layer 6 can be discolored by irradiation of a laser beam. Preferably, an undercoat layer 4 is further provided between the base part 2 and the laser discoloration layer 6. Preferably, the undercoat layer 4 is not discolored by the laser beam. Preferably, the laser discoloration layer 6 includes abase material resin and a laser discoloration material.

Abstract: In this manufacturing method, a tubular body 18 having a rib 16 provided therein is obtained. The manufacturing method includes the steps of: preparing a mandrel 2 divided into two or more divided bodies d1 along a longitudinal direction of the mandrel 2; winding a prepreg r1 for a rib around at least one of the divided bodies d1; combining all the divided bodies d1 to obtain a first intermediate body 10 after the step of winding the prepreg r1 for the rib; winding a prepreg g1 for the outer peripheral part around an outside of the first intermediate body 10 to obtain a second intermediate body; heating the second intermediate body to obtain a cured laminate; and extracting the mandrel 2 from the cured laminate. Preferably, the mandrel is equally divided in a circumferential direction. Preferably, a winding start end part t2 of the prepreg r1 for the rib and a winding finish end part t1 thereof overlap with each other.

Abstract: A head 2 has a face line 8 having a depth of D1 (mm). In a section line of a surface of the face line 8, a boundary between a land area LA and the face line 8 is defined as a point Pa; a point of which a depth is [D¼] (mm) is defined as a point Pb; a point of which a depth is [D½] (mm) is defined as a point Pc; a point of which a depth is [(D1)×(¾)] (mm) is defined as a point Pd; a radius of a circle CL1 passing through three points of the point Pa, the point Pb, and the point Pc is defined as R3 (mm); a straight line passing through the point Pc and the point Pd is defined as a straight line Lcd; a straight line perpendicular to the land area LA is defined as a straight line Lp; and an angle between the straight line Lcd and the straight line Lp is defined as ?m. At that time, the radius R3 is 0.01 (mm) or greater and 0.10 (mm) or less, and the angle ?m is 40 degrees or greater and 70 degrees or less.

Abstract: A golf club head 2a of a first aspect is provided with a head body h1a, a double-stick tape w1, and an adherend s1a bonded to the head body h1a by the double-stick tape w1. When an average thickness of a lower part of the adherend s1a is defined as f1 and an average thickness of an upper part of the adherend s1a is defined as f2, the thickness f2 is smaller than the thickness f1. A golf club head 2 according to a second aspect is provided with a head body h1, a double-stick tape w1 and an adherend s1 bonded to the head body h1 by the double-stick tape w1. When an average thickness of a heel part of the adherend s1 is defined as t1 and an average thickness of a toe part of the adherend s1 is defined as t2, the thickness t2 is smaller than the thickness t1.

Abstract: A golf club of the present invention comprises at least one adjusting mechanism. In the golf club, at least two specifications can be adjusted independently of each other. Preferably, a head, a shaft, a grip, or a joined part therebetween has an adjusting mechanism (1). The head, the shaft, the grip, or the joined part has further other adjusting mechanism (2). Preferably, the adjusting mechanism (1) and the adjusting mechanism (2) can work independently of each other. The number of the adjusting mechanisms is not restricted. Since the plurality of specifications can be adjusted independently of each other, a degree of freedom of adjustability is improved. These adjusting mechanisms can improve accuracy of the adjustability. The specification capable of being adjusted is not restricted.

Abstract: A golf club (2) includes a head (4), a shaft (6) and a grip (8). At least one siping groove (g1) is provided on a surface of the grip (8). The siping groove (g1) is bent in a direction (Dd) of a depth of the grip. A width (Wg) of the siping groove (g1) is set to be equal to or greater than 0.15 mm and is equal to or smaller than 1.5 mm. It is preferable that an opening edge (e1) of the siping groove (g1) should be bent. The width (Wg) is more preferably equal to or greater than 0.20 mm. The width (Wg) is more preferably equal to or smaller than 1.4 mm and is further preferably equal to or smaller than 1.3 mm. A depth (F1) of the siping groove (g1) is preferably equal to or greater than 0.5 mm and is preferably equal to or smaller than 3.5 mm.

Abstract: A shaft 6 is formed by a prepreg sheet. The sheet of the shaft 6 includes full length sheets (a2), (a3), (a8) and (a11) provided wholly in a longitudinal direction of the shaft, and partial sheets (a1), (a4), (a5), (a6), (a7), (a9), (a10) and (a12) provided partially in the longitudinal direction of the shaft. The number of the full length sheets is equal to or greater than two. The number of the partial sheets is equal to or greater than four. Each of the partial sheets has an end.

Abstract: In this manufacturing method, a tubular body 18 having a rib 16 provided therein is obtained. The manufacturing method includes the steps of: preparing a mandrel 2 divided into two or more divided bodies d1 along a longitudinal direction of the mandrel 2; winding a prepreg r1 for a rib around at least one of the divided bodies d1; combining all the divided bodies d1 to obtain a first intermediate body 10 after the step of winding the prepreg r1 for the rib; winding a prepreg g1 for the outer peripheral part around an outside of the first intermediate body 10 to obtain a second intermediate body; heating the second intermediate body to obtain a cured laminate; and extracting the mandrel 2 from the cured laminate. Preferably, the mandrel is equally divided in a circumferential direction. Preferably, a winding start end part t2 of the prepreg r1 for the rib and a winding finish end part t1 thereof overlap with each other.

Abstract: The invention prevents a resin member from being broken so as to improve durability. The invention provides a golf club head (1) in which at least a part of a crown portion (4) forming an upper surface of the head is formed by a resin member (FR) made of a fiber reinforced resin in which a fiber is oriented in a matrix resin. The resin member (FR) includes a one-way fiber reinforced resin layer in which the fiber is oriented in one direction, and a fiber intersection lamination portion which is laminated so as to differentiate a direction of the fiber. At least two one-way fiber reinforced resin layers which are adjacent in a thickness direction are intersected at an angle of 30 to 130 degrees of the fiber. Further, a compressive strength of the fiber of the one-way fiber reinforced resin layer which is arranged in an innermost side in the fiber intersection lamination portion is set to be equal to or more than 1.3 GPa.

Abstract: The invention prevents a resin member from being broken so as to improve durability. The invention provides a golf club head (1) in which at least a part of a crown portion (4) forming an upper surface of the head is formed by a resin member (FR) made of a fiber reinforced resin in which a fiber is oriented in a matrix resin. The resin member (FR) includes a one-way fiber reinforced resin layer in which the fiber is oriented in one direction, and a fiber intersection lamination portion which is laminated so as to differentiate a direction of the fiber. At least two one-way fiber reinforced resin layers which are adjacent in a thickness direction are intersected at an angle of 30 to 130 degrees of the fiber. Further, a compressive strength of the fiber of the one-way fiber reinforced resin layer which is arranged in an innermost side in the fiber intersection lamination portion is set to be equal to or more than 1.3 GPa.

Abstract: A head 2 has a face line 8 having a depth of D1 (mm). In a section line of a surface of the face line 8, a boundary between a land area LA and the face line 8 is defined as a point Pa; a point of which a depth is [D¼] (mm) is defined as a point Pb; a point of which a depth is [D½] (mm) is defined as a point Pc; a point of which a depth is [(D1)×(¾)] (mm) is defined as a point Pd; a radius of a circle CL1 passing through three points of the point Pa, the point Pb, and the point Pc is defined as R3 (mm); a straight line passing through the point Pc and the point Pd is defined as a straight line Lcd; a straight line perpendicular to the land area LA is defined as a straight line Lp; and an angle between the straight line Lcd and the straight line Lp is defined as ?m. At that time, the radius R3 is 0.01 (mm) or greater and 0.10 (mm) or less, and the angle ?m is 40 degrees or greater and 70 degrees or less.

Abstract: A golf club shaft (10) having a weight not less than 30 g nor more than 60 g. The golf club shaft (10) includes a bias layer (B1) composed of a prepreg whose reinforcing fibers have an orientation angle of not less than ±10° nor more than 80° to an axis of the golf club shaft (10) and a straight layers (A1 through A6) each composed of a prepreg whose reinforcing fibers have an orientation angle within 0°±10° to the axis of the golf club shaft (10). At least one partial reinforcing hoop layer whose reinforcing fibers have an orientation angle of within 90°±10° to the axis of the golf club shaft (10) is disposed in only an important reinforcing region in a range from a point (P) spaced at 15% of a full length (L) of the golf club shaft (10) from a grip-side butt (12) thereof to a point (Q) spaced at 45% of the full length (L) of the golf club shaft (10) from the grip-side butt (12) thereof.

Abstract: A golf club head 2a of a first aspect is provided with a head body h1a, a double-stick tape w1, and an adherend s1a bonded to the head body h1a by the double-stick tape w1. When an average thickness of a lower part of the adherend s1a is defined as f1 and an average thickness of an upper part of the adherend s1a is defined as f2, the thickness f2 is smaller than the thickness f1. A golf club head 2 according to a second aspect is provided with a head body h1, a double-stick tape w1 and an adherend s1 bonded to the head body h1 by the double-stick tape w1. When an average thickness of a heel part of the adherend s1 is defined as t1 and an average thickness of a toe part of the adherend s1 is defined as t2, the thickness t2 is smaller than the thickness t1.

Abstract: A head of a first aspect is provided with a head body h1x, a double-stick tape t1, and an adherend s1x bonded to the head body h1x by the double-stick tape t1. The double-stick tape t1 has a first adhesive layer 30 provided as an innermost layer, a second adhesive layer 36 provided as an outermost layer, and intermediate layers 32 and 34 provided between the first adhesive layer 30 and the second adhesive layer 36. The intermediate layer includes a fiber layer 34 and/or a resin layer 32. The resin layer 32 is free of bubbles. In a head of a second aspect, a head body h1y or an adherend s1y has a recessed part 27y. In a head of a third aspect, an adherend s1 has a metal member 27 and an elastic member 29. The elastic member 29 has a peripheral part 29a directly or indirectly abutting on a side surface 31 of the metal member 27.

Abstract: A golf club shaft composed of a laminate of prepregs. A part of the laminate is formed as a fullerene-containing bias layer BF composed of prepregs containing a matrix resin and fullerene and/or a fullerene compound contained in the matrix resin. Reinforcing fibers of the prepregs form an angle of not less than ±10° nor more than ±80° to the axis of the shaft.

Abstract: The invention prevents a resin member from being broken so as to improve durability. The invention provides a golf club head (1) in which at least a part of a crown portion (4) forming an upper surface of the head is formed by a resin member (FR) made of a fiber reinforced resin in which a fiber is oriented in a matrix resin. The resin member (FR) includes a one-way fiber reinforced resin layer in which the fiber is oriented in one direction, and a fiber intersection lamination portion which is laminated so as to differentiate a direction of the fiber. At least two one-way fiber reinforced resin layers which are adjacent in a thickness direction are intersected at an angle of 30 to 130 degrees of the fiber. Further, a compressive strength of the fiber of the one-way fiber reinforced resin layer which is arranged in an innermost side in the fiber intersection lamination portion is set to be equal to or more than 1.3 GPa.