Golf club head

Abstract

To provide a golf club head having an excellent repulsion performance in lower hitting and in which a gravity center can be lowered.SOLUTION: A golf club head 100 includes: a face part fp1 having a hitting face 102; a body bp1; and a weight member W1 provided to the body bp1. The body bp1 includes a weight arrangement part 130 in which the weight member W1 is provided. A toe-heel length D1 of the weight member W1 is longer than a top-sole length D2 of the weight member W1. The body bp1 includes a sole thin part 136 with an outer surface thereof forming a sole face 104 and that has a thickness t1 of 0.8 mm or more to 4.6 mm or less. An inner face 136b of the sole thin part 136 includes: a weight contact face 140 forming the weight arrangement part 130 and that is in contact with the weight member W1; and a space contact face 142 positioned on a face side of the weight contact face 140 and facing the space SP. The weight member W1 is not exposed outside.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a golf club head.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2020-178933 discloses a golf club head including a head body, a face plate fixed to the head body, and a weight member having a specific gravity greater than that of the head body and the face plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By distributing the weight to the lower side of the head, such as arranging a weight member like a weight, it is possible to lower the center of gravity. On the other hand, when the weight is distributed to the lower side of the head, the wall thickness on the lower side of the head increases, and the repulsion performance in a downstroke is likely to decrease. A downstroke is a shot in which the hitting point is located below the hitting face.

[0005] One object of the present invention is to provide a golf club head capable of lowering the center of gravity and having excellent repulsion performance in a downstroke.

Means for Solving the Problems

[0006] In one aspect, there is provided a golf club head having a striking face and a sole surface. The head includes a face portion including the striking face, a body portion, and a weight member disposed in the body portion. The body portion has a weight placement portion where the weight member is disposed. The weight member is coupled to the weight placement portion. The toe-heel direction length of the weight member is greater than the top-sole direction length of the weight member. The body portion has a sole thin-wall portion whose outer surface forms the sole surface and whose wall thickness is 0.8 mm or more and 4.6 mm or less. The inner surface of the sole thin-wall portion has a weight contact surface that forms the weight placement portion and contacts the weight member, and a space contact surface that is located on the face side of the weight contact surface and faces the space. The weight member is not exposed to the outside.

Advantages of the Invention

[0007] As one aspect, it is possible to provide a golf club head with a low center of gravity and excellent repulsion performance in a downswing.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

[0009] Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate. In each embodiment, the same or common elements are denoted by the same reference numerals, and overlapping descriptions are omitted as appropriate.

[0010] In the present application, the following terms are defined.

[0011] [Reference State] When the striking face is flat like an iron head, the state where the head is placed on the ground plane HP with the score line and the ground plane HP being parallel is defined as the reference state. When the striking face is curved like a wood head, the state where the head is placed on the ground plane HP at a predetermined lie angle is defined as the reference state. In these reference states, the center line Z (shaft axis Z) of the shaft hole of the head is arranged in the vertical plane VP (see FIG. 12). The vertical plane VP is a plane perpendicular to the ground plane HP.

[0012] When the striking face is curved, in the above reference state, the face angle is set to 0 degrees. That is, in a plan view seen from above, the normal line at the geometric center of the striking face is perpendicular to the intersection line NL. The intersection line NL is the intersection line between the vertical plane VP and the ground plane HP. When the striking face is flat, the intersection line NL is parallel to the score line.

[0013] A club is known that has a variable mechanism that adjusts the loft angle, lie angle, and face angle according to the rotational position of a sleeve or the like provided at the tip of the shaft. In the head used for such a club, in the above reference state, with all adjustment items set to neutral, the shaft axis Z is specified. Neutral means the center of the adjustment range.

[0014] [Toe - Heel direction] The direction of the intersection line NL is the toe - heel direction. When the striking face is a plane, this toe - heel direction is parallel to the score line.

[0015] [Face - Back direction] The direction of the normal line of the striking face at the face center is the face - back direction. When the striking face is a plane, the face - back direction is the direction perpendicular to the striking face.

[0016] [Top - Sole direction] The direction of the intersection line between the plane perpendicular to the toe - heel direction and the striking face is the top - sole direction. Therefore, the top - sole direction is parallel to the striking face. When the striking face is not a plane, instead of the striking face, the tangent plane at the face center can be used. That is, the direction of the intersection line between the tangent plane and the plane perpendicular to the toe - heel direction can be defined as the top - sole direction.

[0017] [Toe reference position] Each of the plurality of score lines has a toe-side end. Among these toe-side ends, the position of the end located most on the toe side is defined as the toe reference position (see the toe reference position Pt in FIG. 1). Similar to the embodiment of FIG. 1, in a general iron-type golf club head, the positions of the toe-side ends of all the score lines coincide, and this position is defined as the toe reference position. The toe reference position is a position in the toe-heel direction. Note that an iron head in which score lines are provided over substantially the entire area of the striking face is known. This configuration is mainly adopted for wedges, and the configuration of such score lines is referred to as a full score line or the like. In the case of this full score line, a position 18.5 mm away from the most toe-side point on the head toward the heel side can be defined as the toe reference position. 18.5 mm is the distance in the toe-heel direction.

[0018] [Heel reference position] Each of the plurality of score lines has a heel-side end. Among these heel-side ends, the position of the end located most on the heel side is defined as the heel reference position (see the heel reference position Ph in FIG. 1). In a general iron-type golf club head, the position of the heel-side end of the longest score line coincides with the heel reference position. The heel reference position is a position in the toe-heel direction.

[0019] [Score line center position] The position that bisects the distance between the toe reference position and the heel reference position is the score line center position (see the score line center position Pc in FIG. 1). In a general iron-type golf club head, the position of the center of the longest score line is the score line center position. The score line center position is a position in the toe-heel direction.

[0020] [Toe intermediate position] The position that bisects the distance between the toe reference position and the score line center position is the toe intermediate position (see the toe intermediate position Pt1 in FIG. 1). The toe intermediate position is a position in the toe-heel direction.

[0021] [Heel intermediate position] The position that bisects the distance between the heel reference position and the center position of the score line is the mid - heel position (refer to the mid - heel position Ph1 in Fig. 1). The mid - heel position is a position in the toe - heel direction.

[0022] [Longitudinal section] The cross - section along the face - back direction and the top - sole direction is a longitudinal section. In other words, the cross - section by a plane perpendicular to the toe - heel direction is a longitudinal section. The longitudinal section can be set at each position in the toe - heel direction.

[0023] [Leading edge] In the longitudinal section of the head, the point located at the most forward position in the front - rear direction is determined. This point is determined at each position in the toe - heel direction. The set of these points is the leading edge. The leading edge can be the front edge of the sole surface.

[0024] [Trailing edge] In the longitudinal section of the head, when the radius of curvature of the sole surface is sequentially measured backward, the point at which the radius of curvature first becomes 5 mm or less is determined. The set of these points is defined as the trailing edge. The trailing edge can be the rear edge of the sole surface.

[0025] [Face center] At the center position of the score line, the point that bisects the width of the striking face is the face center (refer to the face center Fc in Fig. 1). In a head where the center position of the score line cannot be appropriately defined, the geometric center (centroid) of the striking face in plan view can be the face center.

[0026] FIG. 1 is a view of the golf club head 100 of the first embodiment as seen from the front of the striking face. FIG. 2 is the same view as FIG. 1, with the line of the weight member W1 hidden by the face portion shown as a dashed line. FIG. 3 is a rear view of the head 100 as seen from the back side. FIG. 4 is an exploded perspective view of the head 100. FIG. 5 is a front view of the body member B1. FIG. 6 is a cross-sectional view taken along the line A-A of FIG. 1. FIG. 7 is a cross-sectional view of the body member B1 taken along the line A-A of FIG. 1.

[0027] The head 100 has a striking face 102, a sole surface 104, a back surface 106, a top surface 108, and a hosel 110. The striking face 102 is the portion where the ball hits during a shot. In this embodiment where it is an iron-type head, the flat portion is the striking face 102. The sole surface 104 constitutes the lower surface of the head 100. The top surface 108 constitutes the upper surface of the head 100. The hosel 110 has a hosel hole 112. The hosel portion 112 has a center line Z. A shaft (not shown) is attached to the hosel hole 112. When the head 100 is a wood-type head or a hybrid-type head, the top surface 108 corresponds to the crown surface. On the outer surface of the head 100, the back surface 106 constitutes the surface between the sole surface 104 and the top surface 108. When the head 100 is a wood-type head or a hybrid-type head, the back surface 106 does not exist.

[0028] As shown in FIG. 3, the head 100 has a leading edge Le and a trailing edge Te. The sole surface 104 has a ridge line 114 extending from the toe side toward the heel side. The ridge line 114 is located between the leading edge Le and the trailing edge Te.

[0029] As shown in FIG. 1, the striking face 102 has a plurality of face lines gv. The plurality of face lines gv includes the longest face line gv1. The longest face line gv1 is the face line with the longest length in the toe-heel direction among the plurality of face lines gv.

[0030] As shown in FIG. 1, the striking face 102 has a face center Fc defined as described above. As shown in FIG. 6, the striking face 102 has a sweet spot SS. The sweet spot SS is the intersection of a straight line L1 passing through the center of gravity G1 of the head 100 and perpendicular to the striking face 102 and the striking face 102. Note that FIG. 6 does not mean that the sweet spot SS and the head center of gravity G1 exist on the cross-section of FIG. 6.

[0031] The head 100 is an iron-type head. In an iron-type head, the striking face 102 is a plane except for the score line gv portion. As shown in FIG. 6, the head 100 has a hollow structure. A hollow portion 116 is formed inside the head 100. Such a head 100 is also referred to as a hollow iron head. Note that the head 100 does not have to be a hollow head. The head 100 may be a cavity-back iron head having a back cavity on its back side, or a muscle-back iron head without a back cavity. Note that the iron-type head includes an iron-type hybrid head. When it is an iron-type head, its club number is not limited.

[0032] The head 100 does not have to be an iron-type head. The head 100 may be a wood-type head, a hybrid-type head, or a putter-type head. The striking face 102 does not have to be a plane.

[0033] From a structural perspective, the head 100 has a face portion fp1, a main body portion bp1, and a weight member W1.

[0034] The face part fp1 has a striking face 102. The striking face 102 constitutes the outer surface of the face part fp1. The face part fp1 has a face back surface 103. The face back surface 103 constitutes the inner surface of the face part fp1. The face back surface 103 is the surface on the side opposite to the striking face 102. The face back surface 103 faces the hollow part 116. The face part fp1 can be the part whose outer surface is the striking face 102 and whose inner surface is the face back surface 103. At least a part of the face part fp1 may be integrally formed with at least a part of the main body part bp1.

[0035] The main body part bp1 is located on the back side of the face part fp1. The main body part bp1 has a sole surface 104, a back surface 106, and a top surface 108. The main body part bp1 has the entire sole surface 104. The main body part bp1 has the entire back surface 106. The main body part bp1 may have a part of the striking face 102. In the head 100, the part other than the face part fp1 can be the main body part bp1. At least a part of the main body part bp1 may be integrally formed with at least a part of the face part fp1.

[0036] From the perspective of the constituent members, the head 100 includes a face member F1, a body member B1, and a weight member W1 (see FIG. 4). The face member F1 is formed separately from the body member B1. The body member B1 is formed separately from the face member F1. The head 100 is formed by the combination of the face member F1 and the body member B1.

[0037] The face member F1 has at least a part of the striking face 102. In the present embodiment, the face member F1 has the entire striking face 102. All the score lines gv are formed on the face member F1. The face member F1 has at least a part of the face back surface 103. In the present embodiment, the face member F1 has the entire face back surface 103. The face member F1 has at least a part of the face portion fp1. In the present embodiment, the face member F1 has the entire face portion fp1. The face member F1 may be integrally formed as a whole, or may be formed by joining a plurality of members.

[0038] In the present embodiment, the face member F1 is a plate-shaped member. The form of the face member F1 is not limited. For example, the face member F1 may have a main portion forming the striking face 102, a top-side extending portion extending from the top-side edge of the main portion to the back side, and a sole-side extending portion extending from the sole-side edge of the main portion to the back side. Such a face member F1 may be referred to as a cup face. In this case, the top-side extending portion and the sole-side extending portion of the face member F1 may constitute the main body portion bp1.

[0039] The body member B1 has at least a part of the sole surface 104. In the present embodiment, the body member B1 has the entire sole surface 104. The body member B1 has at least a part of the back surface 106. In the present embodiment, the body member B1 has the entire back surface 106. The body member B1 has at least a part of the top surface 108. In the present embodiment, the body member B1 has a part of the top surface 108. The other part of the top surface 108 is constituted by the face member F1. The body member B1 has at least a part of the main body portion bp1. In the present embodiment, the body member B1 has substantially the entire main body portion bp1. The body member B1 has at least a part of the hosel 110. In the present embodiment, the body member B1 has the entire hosel 110. The body member B1 may be integrally formed as a whole, or may be formed by joining a plurality of members.

[0040] As shown in FIGS. 5 and 7, the body member B1 has an opening 120 that opens toward the face side. The opening 120 is closed by the face member F1. The body member B1 has an end face 122 on the face side. Around the opening 120, the end face 122 extends from the top side of the opening 120 to the sole side via the toe side. The face member F1 is coupled to this end face 122. This coupling is achieved by welding. The entire end face 122 lies in the same plane. The contact surface 124 on the face member F1 side that contacts (abuts against) the end face 122 also lies entirely in the same plane. The boundary between the end face 122 and the contact surface 124 is the boundary 126 between the body member B1 and the face member F1.

[0041] As shown in FIG. 6, the main body portion bp1 has a weight arrangement portion 130 where the weight member W1 is arranged. The weight arrangement portion 130 is provided on the body member B1. In the present embodiment, the weight arrangement portion 130 forms a recess 132. The weight member W1 is arranged in the weight arrangement portion 130. The weight member W1 is accommodated in the weight arrangement portion 130 which is the recess 132. The weight member W1 is coupled to the weight arrangement portion 130. Note that the form of the weight arrangement portion 130 is not limited to the recess 132.

[0042] The weight arrangement portion 130 faces the hollow portion 116 (space SP described later). The recess 132 opens toward the hollow portion 116 (space SP). The weight arrangement portion 130 (recess 132) is covered by the face portion fp1 (face member F1) from the face side. The weight arrangement portion 130 (recess 132) is not exposed to the outside. The weight member W1 arranged in the weight arrangement portion 130 is not exposed to the outside. In the appearance of the head 100, the weight member W1 is not visible. In the appearance of the head 100, the weight arrangement portion 130 is not visible.

[0043] As shown in FIG. 2, the weight member W1 has a toe - heel direction length D1. As shown in FIG. 6, the weight member W1 has a top - sole direction length D2. As shown in FIG. 6, the weight member W1 has a face - back direction length D3. The toe - heel direction length D1 is greater than the top - sole direction length D2. The toe - heel direction length D1 is greater than the face - back direction length D3.

[0044] As shown in FIG. 6, the entire weight member W1 is located on the sole side of the head center of gravity G1. The entire weight member W1 is located on the sole side of the face center Fc.

[0045] As shown in FIG. 2, the weight member W1 has a toe - side end Et and a heel - side end Eh. The weight member W1 continuously extends from the toe - side end Et to the heel thick portion Th. The toe - side end Et is located on the toe side of the face center Fc. The heel - side end Eh is located on the heel side of the face center Fc. As can be seen from FIGS. 1 and 2, the toe - side end Et is located on the toe side of the toe intermediate position Pt1. The toe - side end Et is located on the toe side of the toe reference position Pt. The heel - side end Eh is located on the heel side of the heel intermediate position Ph1. The heel - side end Eh is located on the heel side of the heel reference position Ph. As shown in FIG. 2, when viewed from the front of the striking face 102, the weight member W1 extends from the toe side of the face center Fc, passes under the face center Fc, and extends to the heel side of the face center Fc.

[0046] The recess 132 opens toward the face side. The internal space formed by the recess 132 is connected to the hollow portion 116. Excluding the bonding material described later, only the hollow portion 116 exists between the weight member W1 and the face back surface 103. The recess 132 has a depth in the face - back direction. The weight member W1 is inserted into the recess 132 from the face side. When the weight placement portion 130 is the recess 132, the orientation of the recess 132 is not limited. For example, the recess 132 may open toward the top side.

[0047] The body part bp1 has a sole thin-wall part 136. The sole thin-wall part 136 constitutes a wall part having the sole surface 104 as the outer surface. The sole thin-wall part 136 extends from the position on the sole side of the weight member W1 toward the face side. The sole thin-wall part 136 extends to a position on the face side of the weight member W1. The sole thin-wall part 136 extends to the face back surface 103. The sole thin-wall part 136 has a wall thickness t1. The wall thickness t1 of the sole thin-wall part 136 is 0.8 mm or more and 4.6 mm or less. The wall thickness t1 is measured along the top-sole direction.

[0048] The wall thickness t1 may vary within the above numerical range. The wall thickness t1 may be constant. The wall thickness t1 may be made substantially constant. In this case, the ratio (t1max / t1min) of the maximum value t1max of the wall thickness t1 to the minimum value t1min of the wall thickness t1 can be 1.0 or more and 1.3 or less, further 1.0 or more and 1.2 or less, and further 1.0 or more and 1.1 or less.

[0049] In this embodiment, the body member B1 has the entire sole thin-wall part 136. The end on the face side of the sole thin-wall part 136 is the end face 122 on the face side of the body member B1. Note that the face member F1 may have the entire sole thin-wall part 136. For example, in the face member F1 called the cup face described above, the sole-side extending part may constitute the sole thin-wall part 136. Also, the sole thin-wall part 136 may be composed of the body member B1 and the face member F1. For example, the part on the face side of the sole thin-wall part 136 may be composed of the sole-side extending part of the face member F1, and the part on the back side of the sole thin-wall part 136 may be composed of the body member B1. In this case, the boundary between the face member F1 and the body member B1 may be provided in the sole thin-wall part 136. When the boundary between the face member F1 and the body member B1 is located in the sole thin-wall part 136 and a bonding material (such as a welding bead) is formed at this boundary, the wall thickness t1 increases due to the bonding material. From this viewpoint, it is preferable that no boundary between members is located in the sole thin-wall part 136. In other words, it is preferable that the entire sole thin-wall part 136 is integrally formed.

[0050] FIG. 6 is a longitudinal section of the face center Fc. The head 100 has a sole thin portion 136 in a longitudinal section passing through the face center Fc. Further, the sole thin portion 136 has an expansion in the toe-heel direction. The sole thin portion 136 is formed in the range from the toe intermediate position Pt1 to the heel intermediate position Ph1. The sole thin portion 136 is formed in the range from the toe reference position Pt to the heel reference position Ph. The existence range of the sole thin portion 136 in the toe-heel direction is equal to the existence range of the weight arrangement portion 130 in the toe-heel direction. The sole thin portion 136 is formed on the sole side of the weight arrangement portion 130 (recess 132) along the weight arrangement portion 130 (recess 132).

[0051] FIG. 8 is the same cross-sectional view as FIG. 6. In FIG. 8, a bonding material 138 not shown in FIG. 6 is illustrated. The following (a) to (c) are exemplified as the bonding material 138. (a) A material added to bond the weight member W1 to the weight arrangement portion 130. (b) A molten material composed of the molten main body portion bp1 and / or the weight member W1. (c) A material in which the material of (a) and the molten material of (b) coexist.

[0052] Examples of the material of (a) include a welding material, a brazing material, a solder, and an adhesive.

[0053] In the embodiment of FIG. 8, the bonding material 138 exists at a position that is not the interface between the weight member W1 and the weight arrangement portion 130. At a position that is not the interface between the weight member W1 and the weight arrangement portion 130, the bonding material 138 may or may not exist. For example, the bonding material 138 may exist only at the interface between the weight member W1 and the weight arrangement portion 130. In this case, the cross-sectional view of the head 100 will be as shown in FIG. 6. Note that FIG. 6 is a cross-sectional view in which the description of the bonding material 138 is omitted in the present embodiment, but it is also a cross-sectional view showing a case where the bonding material 138 does not exist on the face side of the weight member W1 as a modification of the present embodiment.

[0054] In the embodiment of FIG. 8, among the recesses 132, the portions that could not be filled with the weight member W1 are filled with the bonding material 138. The bonding material 138 exists on the face side of the weight member W1. Further, the bonding material 138 also penetrates into the interface between the weight member W1 and the weight arrangement portion 130.

[0055] The bonding material 138 has a face side portion 138a located on the face side of the weight member W1. The face side portion 138a is located within the recess 132. This face side portion 138a can contribute to enhancing the fixing strength of the weight member W1 to the recess 132.

[0056] The means for coupling the weight member W1 to the weight arrangement portion 130 is not limited, and examples include welding and adhesion with an adhesive. Examples of welding include fusion welding, pressure welding, and brazing. When a narrow sense of welding involving melting of the base material (weight member W1 and main body portion bp1) is adopted as the coupling method, the bonding material 138 can be a weld bead and / or a filler metal. In this embodiment, brazing is adopted as the coupling method. That is, the bonding material 138 is a brazing material. Examples of brazing materials include silver brazing, copper alloy brazing, and phosphorus copper brazing. In this embodiment, silver brazing is used.

[0057] The outer surface 136a of the sole thin portion 136 forms the sole surface 104. The inner surface 136b of the sole thin portion 136 forms the weight arrangement portion 130 (recess 132) and has a weight contact surface 140 that contacts the weight member W1 and a space contact surface 142 that faces the space SP. The space SP that the space contact surface 142 faces is the hollow portion 116. The space contact surface 142 constitutes the side surface on the sole side in the recess 132. When the head 100 is a cavity back iron head, the space SP can be the space within the back cavity.

[0058] The sole thin-walled portion 136 extends continuously from the sole-side position of the weight member W1 to the face portion fp1. The inner surface 136b of the sole thin-walled portion 136 extends continuously from the weight contact surface 140 to the space contact surface 142. The face-side end of the space contact surface 142 is located on the face back surface 103. The face-side end of the inner surface 136b of the sole thin-walled portion 136 is located on the face back surface 103.

[0059] The sole thin-walled portion 136 has a front portion 144 whose inner surface is the space contact surface 142 and a rear portion 146 whose inner surface is the weight contact surface 140. The front portion 144 is located on the face side of the rear portion 146. The portion between the front portion 144 and the rear portion 146 is also the sole thin-walled portion 136. The sole thin-walled portion 136 extends continuously from the front portion 144 to the rear portion 146.

[0060] The inner surface 136b of the sole thin-walled portion 136 has a bonding material contact surface 143 that contacts the face-side portion 138a of the bonding material 138. The bonding material contact surface 143 is located between the weight contact surface 140 and the space contact surface 142. The weight contact surface 140 is adjacent to the back side of the bonding material contact surface 143, and the space contact surface 142 is adjacent to the face side of the bonding material contact surface 143. The sole thin-walled portion 136 has an intermediate portion 148 whose inner surface is the bonding material contact surface 143. The bonding material 138 is a brazing material. The material of the bonding material 138 has lower rigidity compared to the material of the weight member W1. This rigidity can be the Young's modulus of the material. The bonding material 138 does not inhibit the bending of the sole thin-walled portion 136 as much as the weight member W1. The face-side portion 138a can increase the fixing strength of the weight member W1 to the weight arrangement portion 130 while suppressing the influence on the bending of the sole thin-walled portion 136.

[0061] The main body part bp1 has a top-side forming part 150 located on the top side of the weight arrangement part 130. The top-side forming part 150 faces the hollow part 116. The top-side forming part 150 forms the weight arrangement part 130 (recess 132) and has a top-side contact surface 152 that contacts the weight member W1. The top-side contact surface 152 forms the top-side side surface in the recess 132. The top-side forming part 150 has a front surface 154. The front surface 154 constitutes an opposing surface that opposes the face back surface 103. The front surface 154 faces the face back surface 103 via the space SP. This space SP is the hollow part 116. The sole-side edge 154a of the front surface 154 forms the opening edge of the recess 132. In the present embodiment, the front surface 154 is parallel to the striking face 102. In the embodiment of FIG. 8, the top-side forming part 150 has a thickness (thickness in the top-sole direction) that is greater than the thickness t1 of the sole thin-wall part 136.

[0062] The front surface 154 does not extend beyond the face side of the boundary 126 between the body member B1 and the face member F1. The front surface 154 is located on the back side of the boundary 126 between the body member B1 and the face member F1.

[0063] FIG. 9 is a view of the head 200 of the second embodiment as seen from the front of the striking face 102. In the head 200, the form of the weight arrangement part 130 (recess 132) and the form of the weight member W1 are different from those of the head 100 of the first embodiment. Other than this point, the head 200 is the same as the head 100.

[0064] The weight member W1 of the head 200 has a large amount of weight distributed on the toe side. In a longitudinal section passing through the face center Fc, the weight member W1 is partitioned into a toe-side portion W1t and a heel-side portion W1h. The weight of the toe-side portion W1t is greater than the weight of the heel-side portion W1h. The volume of the toe-side portion W1t is greater than the volume of the heel-side portion W1h. The length D1t of the toe-side portion W1t is greater than the length D1h of the heel-side portion W1h. The lengths D1t and D1h are measured along the toe-heel direction. The portion where the face-back direction width D2 of the weight member W1 is maximum is located in the toe-side portion W1t. The toe-side end Et of the weight member W1 is located on the toe side of the toe reference position Pt (see FIG. 1).

[0065] FIG. 10 is a view of the head 300 of the third embodiment as seen from the front of the striking face 102. In the head 300, the form of the weight member W1 is different from that of the head 100 of the first embodiment. Other than this point, the head 300 is the same as the head 100.

[0066] The weight member W1 of the head 300 is distributed to the toe side and the heel side. The weight member W1 includes a toe weight member Wt and a heel weight member Wh that are separated from each other. The toe weight member Wt is located on the toe side of the heel weight member Wh. The entire toe weight member Wt is located on the toe side of the face center Fc. The entire heel weight member Wh is located on the heel side of the face center Fc. The weight arrangement portion 130 (recess 132) extends from the toe side to the heel side, similar to the head 100. Between the toe weight member Wt and the heel weight member Wh, a portion without the weight member W1 is formed in the weight arrangement portion 130 (recess 132). This portion is referred to as the weight member missing portion 133. The weight member missing portion 133 is a cavity. The toe-heel direction range of the weight member missing portion 133 includes the face center Fc. Due to the weight member missing portion 133, the rear portion 146 disappears, and the easily bendable front portion 144 expands toward the back side (see FIG. 8). By forming the weight member missing portion 133, the sole thin portion 136 becomes more easily bendable. The center of gravity of the toe weight member Wt may be located on the toe side of the toe intermediate position Pt1 (see FIG. 1). The center of gravity of the heel weight member Wh may be located on the heel side of the heel intermediate position Ph1 (see FIG. 1).

[0067] The toe weight member Wt has a toe-heel direction length Dt. The heel weight member Wh has a toe-heel direction length Dh. When the weight member W1 is separated into a plurality of parts, the toe-heel direction length D1 of the weight member W1 is the sum of the toe-heel direction lengths of each part. In the present embodiment, the length D1 is the sum of the length Dt and the length Dh.

[0068] By distributing the weight member W1 to the toe side and the heel side, the left-right MOI can be increased. Also, the weight ratio can be changed between the toe weight member Wt and the heel weight member Wh, and the position of the head center of gravity G1 can be easily adjusted.

[0069] The specific gravity of the weight member W1 is greater than that of the main body portion bp1. The specific gravity of the weight member W1 is greater than that of the face portion fp1. The specific gravity of the weight member W1 is greater than that of the body member B1. The specific gravity of the weight member W1 is greater than that of the face member F1. In the comparison of specific gravities, the specific gravity of a member or part composed of a plurality of materials is regarded as the average specific gravity. The average specific gravity is calculated by dividing its total weight (g) by its total volume (cm 3 ).

[0070] As an example of the material of the body member B1, metal is exemplified. As this metal, stainless steel, mild steel, maraging steel, and titanium alloy are exemplified. The material of the body member B1 may be other than metal, for example, carbon fiber reinforced resin. The body member B1 may be composed of a plurality of materials.

[0071] As an example of the material of the face member F1, metal is exemplified. As this metal, titanium alloy, stainless steel, chromium vanadium steel, and maraging steel are exemplified. The material of the face member F1 may be other than metal, for example, carbon fiber reinforced resin. The face member F1 may be composed of a plurality of materials.

[0072] As an example of the material of the weight member W1, metal is exemplified. As this metal, an alloy containing tungsten and / or nickel can be mentioned. From the viewpoint of high specific gravity, an alloy containing tungsten and nickel is more preferable.

[0073] From the viewpoint of lowering the center of gravity, the specific gravity of the weight member W1 is preferably 9 or more, more preferably 10 or more, and still more preferably 11 or more. Considering available materials, the specific gravity of the weight member W1 is preferably 20 or less, more preferably 19 or less, and still more preferably 18 or less.

[0074] Considering the material having the required strength for the main body portion bp1, the specific gravity of the main body portion bp1 is preferably 4.0 or more, more preferably 4.1 or more, and still more preferably 4.2 or more. From the viewpoint of lowering the center of gravity, it is preferable that the difference in specific gravity between the main body portion bp1 and the weight member W1 is large. From this viewpoint, the specific gravity of the main body portion bp1 is preferably 8.0 or less, more preferably 7.95 or less, and still more preferably 7.9 or less. Considering the material having the required strength for the face portion fp1, the specific gravity of the face portion fp1 is preferably 4.0 or more, more preferably 4.1 or more, and still more preferably 4.2 or more. From the viewpoint of lowering the center of gravity, it is preferable that the difference in specific gravity between the face portion fp1 and the weight member W1 is large. From this viewpoint, the specific gravity of the face portion fp1 is preferably 8.0 or less, more preferably 7.95 or less, and still more preferably 7.9 or less.

[0075] Considering the material having the required strength for the body member B1, the specific gravity of the body member B1 is preferably 4.0 or more, more preferably 4.1 or more, and still more preferably 4.2 or more. From the viewpoint of lowering the center of gravity, it is preferable that the difference in specific gravity between the body member B1 and the weight member W1 is large. From this viewpoint, the specific gravity of the body member B1 is preferably 8.0 or less, more preferably 7.95 or less, and still more preferably 7.9 or less. Considering the material having the required strength for the face portion fp1, the specific gravity of the face member F1 is preferably 4.0 or more, more preferably 4.1 or more, and still more preferably 4.2 or more. From the viewpoint of lowering the center of gravity, it is preferable that the difference in specific gravity between the face member F1 and the weight member W1 is large. From this viewpoint, the specific gravity of the face member F1 is preferably 8.0 or less, more preferably 7.95 or less, and still more preferably 7.9 or less.

[0076] Each of the embodiments shown above has the following operational effects.

[0077] The weight member W1 having a toe-heel direction length D1 larger than the top-sole direction length D2 is disposed facing the sole thin portion 136. For this reason, the head 100 can have a low center of gravity. By lowering the center of gravity, the launch angle can be increased.

[0078] The sole thin-walled portion 136 makes the lower side of the face portion fp1 more likely to bend, and can improve the repulsion performance in the downstroke.

[0079] The sole thin-walled portion 136 has a front portion 144 provided with a space tangent plane 142. This front portion 144 is easily bent and enhances the repulsion performance in the downstroke.

[0080] The sole thin-walled portion 136 continuously extends from the position of the weight member W1 on the sole side to the face portion fp1. Therefore, the sole thin-walled portion 136 is effectively bent by the impact on the face portion fp1, and the repulsion performance in the downstroke is enhanced.

[0081] Since the weight member W1 is not exposed to the outside, the appearance of the head 100 can be enhanced. Since the weight member W1 is not exposed, the joint portion between the weight member W1 and the weight arrangement portion 130 can also be configured not to be exposed to the outside. The degree of freedom with respect to the appearance of the joint portion can be increased, and the manufacturing of the head 100 becomes easy.

[0082] In FIG. 2, what is indicated by the double arrow D1 is the toe-heel direction length of the weight member W1. In FIG. 6, what is indicated by the double arrow D2 is the top-sole direction length of the weight member W1. In FIG. 6, what is indicated by the double arrow D3 is the face-back direction length of the weight member W1. The units of D1, D2, and D3 are mm. As described above, the toe-heel direction length D1 is larger than the top-sole direction length D2. In the above embodiment, the top-sole direction length D2 is larger than the face-back direction length D3.

[0083] From the viewpoint of lowering the position of the head center of gravity, the top-sole direction length D2 is preferably 20 mm or less, more preferably 15 mm or less, still more preferably 10 mm or less, and even more preferably 7 mm or less. From the viewpoint of increasing the weight of the weight member W1, the top-sole direction length D2 is preferably 3.0 mm or more, more preferably 3.5 mm or more, and still more preferably 4.0 mm or more.

[0084] From the viewpoint of increasing the weight of the weight member W1 and increasing the center-of-gravity depth D4, the face-back direction length D3 is preferably 3.0 mm or more, more preferably 3.3 mm or more, and still more preferably 3.6 mm or more. From the viewpoints of the restriction of the head size and reducing the sweet spot height H2, the face-back direction length D3 is preferably 18 mm or less, more preferably 16 mm or less, and still more preferably 14 mm or less.

[0085] In FIG. 1, what is indicated by the double-headed arrow H1 is the head height. The head height H1 is measured at the toe-heel direction position of the face center Fc. The top-sole direction height of the head 100 at the face center is the head height H1. The head height H1 is measured along the top-sole direction. The unit of the head height H1 is mm.

[0086] The ratio (D2 / H1) of the top-sole direction length D2 of the weight member W1 to the head height H1 may be considered. From the viewpoint of lowering the position of the head center of gravity, D2 / H1 is preferably 0.5 or less, more preferably 0.4 or less, still more preferably 0.3 or less, and still more preferably 0.2 or less. From the viewpoint of increasing the weight of the weight member W1, D2 / H1 is preferably 0.05 or more, more preferably 0.06 or more, and still more preferably 0.07 or more.

[0087] In FIG. 6, what is indicated by the double-headed arrow H2 is the sweet spot height. The sweet spot height H2 is the height of the sweet spot SS from the ground plane HP in the above reference state. The sweet spot height H2 is measured along the direction perpendicular to the ground plane HP. The unit of the sweet spot height H2 is mm.

[0088] The ratio (H2 / H1) of the sweet spot height H2 to the head height H1 may be considered. From the viewpoint of lowering the center of gravity, H2 / H1 is preferably 0.50 or less, more preferably 0.48 or less, and still more preferably 0.46 or less. When ensuring the required head shape, there is a limit to lowering the center of gravity. H2 / H1 can be 0.30 or more, further 0.31 or more, and further 0.32 or more.

[0089] In FIG. 6, what is indicated by the double arrow D4 is the center-of-gravity depth. The center-of-gravity depth is the distance from the hitting face 102 to the head center of gravity G1. The center-of-gravity depth D4 is measured along the face-back direction. The unit of the center-of-gravity depth D4 is mm.

[0090] In FIG. 8, what is indicated by the double arrow D5 is the head thickness. The head thickness D5 is measured at the toe-heel direction position of the face center Fc. The head thickness D5 is measured along the face-back direction. The unit of the head thickness D5 is mm.

[0091] The ratio (D4 / D5) of the center-of-gravity depth D4 to the head thickness D5 may be considered. From the viewpoint of reducing the sweet spot height H2, D4 / D5 is preferably 0.50 or less, more preferably 0.40 or less, and even more preferably 0.35 or less. If the center-of-gravity depth D4 is too small, the moment of inertia of the head 100 tends to decrease. From this viewpoint, D4 / D5 is preferably 0.10 or more, more preferably 0.15 or more, and even more preferably 0.20 or more.

[0092] In FIG. 6, what is indicated by the double arrow D6 is the distance between the front surface 154 of the top-side forming portion 150 and the face back surface 103. This distance is measured along the face-back direction. From the viewpoint of reducing the sweet spot height H2, the distance D6 is preferably 7.0 mm or less, more preferably 6.5 mm or less, and even more preferably 6.0 mm or less. From the viewpoint of increasing the moment of inertia of the head 100 by increasing the center-of-gravity depth D4, the distance D6 is preferably 0.8 mm or more, more preferably 1.0 mm or more, and even more preferably 1.2 mm or more.

[0093] From the viewpoint of suppressing the center of gravity depth D4 and reducing the sweet spot height H2, the top-to-toe direction length D2 of the weight member W1 is preferably greater than the face-to-back direction length D3. From this viewpoint, D2 / D3 is preferably 1.05 or more, more preferably 1.10 or more, and even more preferably 1.15 or more. If the top-to-toe direction length D2 is excessive, the position of the center of gravity of the weight member W1 will be high. From this viewpoint, D2 / D3 is preferably 7.0 or less, more preferably 6.0 or less, and even more preferably 5.0 or less.

[0094] When the volume of the weight member W1 is V1 (cm 3 ) and the volume of the head 100 is V2 (cm 3 ), the ratio (V1 / V2) may be considered. By ensuring the weight of the weight member W1, the effect of the center of gravity shift by the weight member W1 can be enhanced. From this viewpoint, V1 / V2 is preferably 0.010 or more, more preferably 0.015 or more, and even more preferably 0.020 or more. By locally arranging the weight member W1, the effect of the center of gravity shift by the weight member W1 can be enhanced. From this viewpoint, V1 / V2 is preferably 0.1 or less, more preferably 0.09 or less, and even more preferably 0.08 or less.

[0095] Among the weight of the weight member W1, the ratio Rt arranged on the toe side of the head center of gravity G1 may be 60% or more. By arranging more weight on the toe side, the degree of dispersion of the head weight in the toe-to-heel direction increases between the weight of the hosel 110. As a result, the left and right MOI may increase. When the left and right MOI increases, the sweet area becomes wider and the tolerance increases. From this viewpoint, this ratio Rt may be 65% or more, or may be 70% or more. From the viewpoint of ensuring the toe-to-heel direction length D1, this ratio Rt may be 90% or less, may be 85% or less, or may be 80% or less. In the above reference state, an axis perpendicular to the ground plane HP passing through the head center of gravity G1 is set. The moment of inertia of the head around this axis is the left and right MOI.

[0096] From the perspective of increasing the weight of the weight member W1 while lowering the center of gravity position of the weight member W1, the toe-heel direction length D1 is preferably 10 mm or more, more preferably 20 mm or more, and still more preferably 30 mm or more. From the perspective of the constraints due to the head dimensions, the toe-heel direction length D1 is preferably 66 mm or less, more preferably 65 mm or less, and still more preferably 64 mm or less.

[0097] From the perspective of reducing the sweet spot height H2, the center of gravity depth D4 is preferably 10 mm or less, more preferably 9 mm or less, still more preferably 8 mm or less, and even more preferably 7 mm or less. From the perspective of increasing the moment of inertia of the head 100, the center of gravity depth D4 is preferably 3 mm or more, more preferably 3.5 mm or more, and still more preferably 4 mm or more.

[0098] By projecting the weight member W1 onto the striking face 102, the projected area of the weight member W1 can be obtained. The direction of this projection is perpendicular to the striking face 102. This projected area is denoted as S1 (mm 2 ). The area of the striking face 102 is S2 (mm 2 ). The area of the striking face 102 is measured with the score line gv filled. In the iron-type head of the above embodiment, the peripheral edge line of the striking face 102 is determined by the boundary line between the flat portion and the non-flat portion, and the area of the figure drawn by this peripheral edge line is the area S2 of the striking face 102. The area S2 is also referred to as the face area.

[0099] The ratio (S1 / S2) of the projected area S1 of the weight member W1 to the face area S2 can be considered. By ensuring the weight of the weight member W1, the effect of the center of gravity movement by the weight member W1 can be enhanced. From this perspective, S1 / S2 is preferably 0.03 or more, more preferably 0.04 or more, still more preferably 0.05 or more, and even more preferably 0.06 or more. By locally arranging the weight member W1, the effect of the center of gravity movement by the weight member W1 can be enhanced. From this perspective, S1 / S2 is preferably 0.17 or less, more preferably 0.15 or less, and still more preferably 0.13 or less.

[0100] In FIG. 8, the double-headed arrow D7 indicates the depth of the recess 132 that constitutes the weight placement portion 130. The depth D7 is measured along the face-back direction. In measuring the depth D7, the deepest point Pd that is the starting point of the measurement is the point where the weight member W1 enters the recess 132 most deeply.

[0101] From the viewpoint of facilitating the fixing of the weight member W1, the depth D7 is preferably 3 mm or more, more preferably 3.5 mm or more, and even more preferably 4 mm or more. Considering the preferable value of the face-back direction length D3 of the weight member W1, the depth D7 of the recess 132 is preferably 18 mm or less, more preferably 17 mm or less, and even more preferably 16 mm or less.

[0102] In FIG. 8, the double-headed arrow D8 indicates the distance between the back-side end of the weight member W1 and the hitting face 102. The distance D8 is measured along the face-back direction. The distance D8 can be the maximum value of the distances that can be measured at each position in the toe-heel direction. The ratio (D8 / D5) of this distance D8 to the head thickness D5 may be considered. From the viewpoint of reducing the sweet spot height H2, D8 / D5 may be 0.50 or less, further 0.48 or less, and further 0.46 or less. However, from the viewpoint of increasing the left-right MOI, D8 / D5 can be made greater than 0.50. Considering the face-back direction length D3 of the weight member W1, the thickness of the face portion fp1, etc., D8 / D5 can be 0.30 or more, further 0.33 or more, and further 0.36 or more.

[0103] As described above, the thickness t1 of the sole thin-walled portion 136 is 0.8 mm or more and 4.6 mm or less. By reducing the thickness t1, the position of the weight member W1 can be lowered, and the head center of gravity can be lowered. Further, by reducing the thickness t1, the rigidity of the sole thin-walled portion 136 is reduced, and the repulsion performance in the downswing is improved. From this viewpoint, the thickness t1 of the sole thin-walled portion 136 is preferably 4.6 mm or less, more preferably 3.0 mm or less, and even more preferably 2.0 mm or less. From the viewpoint of the durability of the head 100, the thickness t1 of the sole thin-walled portion 136 is preferably 0.8 mm or more, more preferably 0.9 mm or more, and even more preferably 1.0 mm or more.

[0104] For a head that has many opportunities to hit a ball placed on the ground without teeing up, the merit of high repulsion performance in the downswing is great. From this viewpoint, the head of the present invention is preferably a hybrid head (excluding an iron-type hybrid head) and an iron-type head (including an iron-type hybrid head), and more preferably an iron-type head. For a club with a relatively small loft angle, the hit ball tends to be low, and the merit of increasing the hit ball height by lowering the center of gravity is great. From this viewpoint, the real loft angle of the head is preferably 38° or less, more preferably 35° or less, and even more preferably 33° or less. Considering the lower limit value of the loft angle of the iron-type head, the real loft angle of the head is preferably 15° or more, more preferably 17° or more, even more preferably 19° or more, and even more preferably 21° or more.

[0105] The manufacturing method of the head is not limited. The above-described head 100 has a face member F1 and a body member B1 joined together, and the body member B1 has a weight arrangement portion 130. Such a head can be manufactured, for example, by a manufacturing method including the following steps (1) to (3). (1) A step of preparing a face member F1, a body member B1, and a weight member W1. (2) A step of joining the weight member W1 to the weight arrangement portion 130 of the body member B1. (3) A step of joining the face member F1 to the body member B1 to which the weight member W1 is joined.

Example

[0106] [Embodiment] A head identical to the head 100 of the first embodiment was created. The body member B1 was produced by casting (lost wax precision casting). The material of the body member B1 was stainless steel. The face member F1 was produced by forging. The material of the face member F1 was maraging steel. The weight member W1 was produced by powder sintering. The material of the weight member W1 was a tungsten nickel alloy. The weight member W1 was housed in the recess 132 of the weight placement portion 130 and joined to the recess 132 by brazing (brazing). Regarding the weight member W1, the specific gravity was 12, the weight was 10 g, the toe-heel direction length D1 was 56.5 mm, the top-sole direction length D2 was 4.6 mm, and the face-back direction length D3 was 4.0 mm. The specific gravity (average specific gravity) of the portion other than the weight member W1 in the head 100 was 7.83. The manufacturing process of the head was carried out according to the above-described processes (1) to (3).

[0107] When a head was created with a real loft angle of 28.5° (7-iron), the sweet spot height H2 was 19.6 mm, the head height H1 was 45.8 mm, the center of gravity depth D4 was 5.8 mm, and the head thickness D5 was 20.5 mm. When a head was created with a real loft angle of 25.5° (6-iron), the sweet spot height H2 was 19.4 mm, the head height H1 was 45.1 mm, the center of gravity depth D4 was 6.4 mm, and the head thickness D5 was 20.8 mm. When a head was created with a real loft angle of 23.0° (5-iron), the sweet spot height H2 was 19.1 mm, the head height H1 was 44.6 mm, the center of gravity depth D4 was 6.4 mm, and the head thickness D5 was 20.7 mm. When a head was created with a real loft angle of 21.0° (4-iron), the sweet spot height H2 was 19.3 mm, the head height H1 was 44.0 mm, the center of gravity depth D4 was 6.4 mm, and the head thickness D5 was 21.0 mm. For all the heads, values such as D2 / H1, H2 / H1, and D4 / D5 were favorable values, and low center of gravity was achieved. The projected area S1 of the weight member W1 was 252 mm 3and the face area S2 was 3009 mm 3 (7-iron).

[0108] [Comparative Example] To confirm the repulsion performance in the downswing, a comparative example was created. FIG. 11 is a view of the head 400 of the comparative example seen from the front of the hitting face 102. In the head 400, the weight arrangement portion 130 (recess 132) is provided only on the toe side, and the weight member W1 is also provided only on the toe side. The sole thin portion 136 is not formed in the portion without the recess 132. The specific gravity of the weight member W1 is 12, and the weight of the weight member W1 is 10 g. The head (7-iron) of the comparative example 400 was obtained by making it the same as the head 100 of the example except for the positions of the weight arrangement portion 130 and the weight member W1.

[0109] The COR at the downswing hitting point was measured for the example and the comparative example. In this measurement, a first point was set on the hitting face 102. In the head in the reference state, the point where the height from the ground plane HP (vertical height) is 15 mm and the position in the toe-heel direction is the same as the face center Fc was defined as the first point. This first point is close to the ground plane HP and is located below the face center Fc (on the sole side). Further, a point 5 mm apart from this first point on the sole side in the top-sole direction was defined as the second point. Further, measurement points were set at 5 mm intervals in the toe-heel direction and the top-sole direction with the first point as the origin. The COR was measured at each measurement point including the first point and the second point. By comparing the measured values at all the measurement points, the maximum value of the COR in that head was obtained.

[0110] For the head of the example, with respect to the maximum value of the COR, the COR at the first point was 96% and the COR at the second point was 86%. For the head of the comparative example, with respect to the maximum value of the COR, the COR at the first point was 93% and the COR at the second point was 83%. The example was superior in the repulsion performance in the downswing compared to the comparative example.

[0111] Note that COR means Coefficient Of Restitution. COR was measured based on "Interim Procedure for Measuring the Coefficient of Restitution of an Iron Clubhead Relative to a Baseline Plate Revision 1.3 January 1, 2006" defined by the USGA (United States Golf Association).

[0112] The following supplementary notes are part of the invention included in this application. [Supplementary Note 1] A golf club head having a striking face and a sole surface, comprising a face portion including the striking face, a main body portion, and a weight member disposed in the main body portion, wherein the main body portion has a weight placement portion where the weight member is disposed, the weight member is coupled to the weight placement portion, the toe - heel direction length of the weight member is greater than the top - sole direction length of the weight member, the main body portion has a sole thin - wall portion whose outer surface forms the sole surface and whose wall thickness is 0.8 mm or more and 4.6 mm or less, the inner surface of the sole thin - wall portion has a weight contact surface that forms the weight placement portion and contacts the weight member, and a space contact surface that is located on the face side of the weight contact surface and faces the space, a golf club head in which the weight member is not exposed to the outside. [Supplementary Note 2] The golf club head according to Supplementary Note 1, wherein the sole thin - wall portion continuously extends from the sole - side position of the weight member to the face portion. [Supplementary Note 3] The golf club head according to Supplementary Note 1 or 2, wherein the sole thin - wall portion is integrally formed as a whole. [Supplementary Note 4] When the top - sole direction length of the weight member is D2 and the top - sole direction height of the head at the face center is H1, the golf club head according to any one of Appendices 1 to 3, wherein D2 / H1 is 0.05 or more and 0.5 or less. [Appendix 5] When the height of the sweet spot is H2 and the top - sole direction height of the head at the face center is H1, the golf club head according to any one of Appendices 1 to 4, wherein H2 / H1 is 0.30 or more and 0.50 or less. [Appendix 6] When the center - of - gravity depth is D4 and the face - back direction thickness of the head at the face center is D5, the golf club head according to any one of Appendices 1 to 5, wherein D4 / D5 is 0.10 or more and 0.50 or less. [Appendix 7] When the projected area of the weight member projected on the striking face is S1 and the area of the striking face is S2, the golf club head according to any one of Appendices 1 to 6, wherein S1 / S2 is 0.03 or more and 0.17 or less.

Explanation of Signs

[0113] 100, 200, 300, 400 ··· golf club head 102 ··· striking face 103 ··· face back 104 ··· sole 106 ··· back 108 ··· top 110 ··· hosel 116 ··· hollow part 120 ··· opening of the body member 130 ··· weight arrangement part 132 ··· concave part 136 ··· sole thin - wall part 136a ··· outer surface of the sole thin - wall part 136b ··· inner surface of the sole thin - wall part 138 ··· bonding material 140 ··· weight contact surface 142 ··· space contact surface 150 ··· Top side forming part 154 ··· Front surface of the top side forming part Fc ··· Face center SP ··· Space (hollow part) gv ··· Score line gv1 ··· Longest score line F1 ··· Face member B1 ··· Body member W1 ··· Weight member Pt ··· Toe reference position Pc ··· Score line center position Ph ··· Heel reference position Le ··· Leading edge Te ··· Trailing edge

Claims

1. A golf club head having a striking face and a sole face, comprising a face portion including the striking face, a body portion, and a weight member disposed in the body portion, wherein the body portion has a weight placement portion where the weight member is disposed, the weight member is coupled to the weight placement portion, the toe-heel direction length of the weight member is greater than the top-sole direction length of the weight member, the body portion has a sole thin-wall portion whose outer surface forms the sole face and whose wall thickness is 0.8 mm or more and 4.6 mm or less, the inner surface of the sole thin-wall portion has a weight contact surface that forms the weight placement portion and contacts the weight member, and a space contact surface that is located on the face side of the weight contact surface and faces the space, a golf club head in which the weight member is not exposed to the outside.

2. The golf club head according to claim 1, wherein the sole thin-wall portion continuously extends from the sole side position of the weight member to the face portion.

3. The golf club head according to claim 1 or 2, wherein the sole thin-wall portion is integrally formed as a whole.

4. When the top-sole direction length of the weight member is D2 and the top-sole direction height of the head at the face center is H1, D2 / H1 is 0.05 or more and 0.5 or less. The golf club head according to claim 1 or 2.

5. When the height of the sweet spot is H2 and the top-sole direction height of the head at the face center is H1, H2 / H1 is 0.30 or more and 0.50 or less. The golf club head according to claim 1 or 2.

6. When the center of gravity depth is D4 and the face-back direction thickness of the head at the face center is D5, D4 / D5 is 0.10 or more and 0.50 or less. The golf club head according to claim 1 or 2.

7. When the projected area of the weight member projected onto the striking face is S1 and the area of the striking face is S2, S1 / S2 is 0.03 or more and 0.17 or less. The golf club head according to claim 1 or 2.

Images