JP7211332B2 - golf club head - Google Patents

Description

The present disclosure relates to golf club heads.

A head having a face plate fixed to a head body is known. Japanese Patent No. 5708870 discloses an iron-type golf club head comprising a plate-like face member having a face surface and a face back surface, and a head body having a frame portion for fixing the outer peripheral portion of the face member. In this head, the frame portion has a support wall portion having a receiving surface capable of coming into contact with the outer peripheral portion of the back surface of the face, and the support wall portion has at least one notch.

Japanese Patent No. 5708870

The inventor has found a new structure capable of enhancing the resilience of a head having a faceplate.

The present disclosure provides a new structure for enhancing repulsion performance in a head having a faceplate.

In one aspect, a golf club head includes a head body having a sole and a faceplate secured to the head body. The face plate has a plate front surface forming part of a hitting face, a plate rear surface opposite to the plate front surface, and a plate side surface extending between the plate front surface and the plate rear surface. there is The head body has an opening in which the face plate is arranged, and a back supporting portion that supports the face plate from the back side. The bag support portion has a bag receiving surface forming a contact area by contact with the outer peripheral edge of the rear surface of the plate, and a rear surface opposite to the bag receiving surface. The end of the rear surface on the face periphery side is located closer to the face periphery than the end of the contact area on the face center side.

As one aspect, resilience performance at the periphery of the face can be improved.

1 is a front view of a golf club head according to a first embodiment; FIG. 2 is a rear view of the head of FIG. 1; FIG. 3 is a perspective view of the head of FIG. 1; FIG. 4 is an exploded perspective view of the head of FIG. 1; FIG. FIG. 5 is a rear view of the first member; FIG. 6 is a front view of the head body. FIG. 7 is a cross-sectional view along line AA in FIG. 8 is a cross-sectional view taken along line BB of FIG. 2. FIG. 9 is a cross-sectional view taken along line CC of FIG. 2. FIG. FIG. 10 is a cross-sectional view of a golf club head according to the second embodiment. FIG. 11 is a cross-sectional view of a golf club head of a comparative example. FIG. 12 is a rear view of the first member according to the third embodiment; FIG. 13 is a rear view of the first member according to the fourth embodiment; 14A to 14D are process diagrams showing the method of manufacturing the head of the first embodiment.

The following terms are defined in this application.

[Toe-heel direction]
The extending direction of the longest face line is defined as the toe-heel direction. The meaning of the terms "toe side" and "heel side" in this application are interpreted based on this toe-heel direction.

[vertical direction]
The direction parallel to the striking face and perpendicular to the toe-heel direction is defined as the up-down direction. In the present application, the meanings of the terms "upper" and "lower" are interpreted based on this vertical direction.

[Face-back direction]
The direction perpendicular to the hitting face is defined as the face-back direction. If the hitting face is curved, the direction of the normal at the face center is defined as the face-back direction. The meanings of the terms "face side" and "back side" in this application are interpreted based on this face-back direction.

[Face center]
The center position of the hitting face in the vertical direction at the center position of the longest face line in the toe-heel direction is the face center.

[Face Surrounding Side]
In the present application, the face peripheral side is defined as a concept meaning the side away from the center of the head. The face peripheral side means the lower side in the sole side region of the head, the upper side in the top side region of the head, the toe side in the toe side region of the head, and the heel side region of the head. means the heel side.

[Face center side]
In the present application, the face center side is defined as a term meaning the side closer to the center of the head. The face center side means the upper side in the sole side region of the head, the lower side in the top side region of the head, the heel side in the toe side region of the head, and the heel side region of the head. means the toe side. "Face center side" is an antonym of "face peripheral side".

[Sole side area, top side area, toe side area, heel side area]
It may be difficult to determine whether each portion of the head belongs to the sole side, top side, toe side, or heel side. In this case, the sole side area, the top side area, the toe side area and the heel side area can be defined with reference to the following planes Pa, Pb, Pc and Pd.

As shown in FIG. 1, straight lines La, Lb, Lc and Ld can be drawn from the centroid CF of the plate front surface f11. A straight line La is a straight line connecting the centroid CF and the point A. FIG. A straight line Lb is a straight line connecting the centroid CF and the point B. FIG. A straight line Lc is a straight line connecting the centroid CF and the point C. As shown in FIG.
A straight line Ld is a straight line connecting the centroid CF and the point D. FIG. Point A is the point with the smallest radius of curvature on the outer edge line E1 existing in the upper toe region. The upper toe region means a region on the toe side and above the centroid CF of the plate front surface f11. Point B is the point with the smallest radius of curvature on the outer edge line E1 existing in the heel area. The region above the heel means a region on the heel side and above the centroid CF of the plate front surface f11. Point C is the point with the smallest radius of curvature on the outer edge line E1 existing in the lower heel region. The area below the heel means an area on the heel side and below the centroid CF of the plate front surface f11. Point D is the point with the smallest radius of curvature on the outer edge line E1 existing in the lower toe region. The lower toe area means an area on the toe side and below the centroid CF of the plate front surface f11. The outer edge line E1 is the outer edge line of the plate front surface f11 and is present on the hitting face 102 .

A plane Pa including the straight line La and perpendicular to the plate front surface f11, a plane Pb including the straight line Lb and perpendicular to the plate front surface f11, and a plane including the straight line Lc and perpendicular to the plate front surface f11 A plane Pc and a plane Pd including the straight line Ld and perpendicular to the plate front surface f11 are defined. These four planes Pa, Pb, Pc, and Pd can divide the head, head body, first member, and faceplate into a toe-side region R1, a heel-side region R2, a top-side region R3, and a sole-side region R4 ( See Figure 1).

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate.

1 is a front view of the head 100 of the first embodiment, FIG. 2 is a rear view of the head 100, and FIG. 3 is a perspective view of the head 100. FIG.

Head 100 has a striking face 102 , a sole 104 , a top surface 106 and a hosel 108 . Hosel 108 has a hosel bore 110 . A shaft (not shown) is attached to the hosel hole 110 .

The hitting face 102 has a plurality of face lines gv. The plurality of face lines includes the longest face line gv1. In FIG. 1, only the longest face line gv1 positioned closest to the sole is shown among the plurality of face lines gv.

Head 100 is an iron-type golf club head. The hitting face 102 is planar. As shown in FIGS. 2 and 3, head 100 has a back cavity 112 . Head 100 is a cavity back iron.

Note that the head 100 may not be an iron type head. The head 100 may be a wood type head, a utility type head, or a putter type head.

FIG. 4 is an exploded perspective view of the head 100. FIG. Head 100 is formed of a plurality of members. The head 100 has a head body hb1 and a faceplate f1. The faceplate f1 is fixed to the head body hb1. The head body hb1 has a first member h1 and a second member b1. The second member b1 has a weight wt.

The face plate f1 has a plate front surface f11, a plate rear surface f12, and a plate side surface f13. As shown in FIG. 1, the plate front surface f11 forms part of the hitting face 102. As shown in FIG. The plate front surface f11 constitutes most of the hitting face 102 . The plate rear surface f12 is a surface opposite to the plate front surface f11. The plate side f13 extends between the outer edge of the plate front surface f11 and the outer edge of the plate rear surface f12.

The plate rear surface f12 has an outer peripheral edge portion 114 . In this embodiment, the outer peripheral edge portion 114 is a convex portion. That is, as shown in FIG. 4, the outer peripheral edge portion 114 of the plate rear surface f12 is the peripheral edge convex portion 116 . The peripheral edge protrusion 116 extends along the outer edge of the plate rear surface f12. The peripheral edge protrusion 116 is formed over the entire circumference of the plate rear surface f12.

FIG. 5 is a rear view of the first member h1. FIG. 6 is a front view of the head body hb1.

The head body hb1 has a first member h1 and a second member b1. The head main body hb1 is formed by joining the second member b1 to the first member h1. The second member b1 is fixed to the back side of the first member h1. The head main body hb1 may be integrally molded as a whole.

As shown in FIG. 5, the first member h1 has an opening 120. As shown in FIG. Opening 120 is a through hole. Aperture 120 has an aperture inner surface 122 . Faceplate f1 is placed in opening 120 . The faceplate f1 is fitted in the opening 120. As shown in FIG. The opening 120 is closed by the faceplate f1. The first member h1 constitutes a frame m1 that fixes the faceplate f1.

The first member h1 constitutes the entire hosel 108 . The first member h1 constitutes the entire top surface 106 . The first member h1 forms part of the sole 104 (front portion). The first member h1 constitutes a part (periphery) of the hitting face 102 .

The second member b1 is attached to the back side of the first member h1. The second member b1 forms part of the sole 104 (rear portion). The center of gravity of the second member b1 is positioned below the center of gravity of the head 100 . The center of gravity of the second member b1 is located on the back side of the center of gravity of the head 100 .

The material of the second member b1 may be the same as the material of the first member h1. The material of the second member b1 may be different from the material of the first member h1. The specific gravity of the second member b1 may be made larger than the specific gravity of the first member h1. In this case, the entire second member b1 can be used as a weight body. From the viewpoint of joint strength, the second member b1 is preferably weldable to the first member h1.

2 and 3, a boundary line k1 between the second member b1 and the first member h1 is indicated by a chain double-dashed line. The boundary line k1 is not visible in the finished product head 100 that has undergone the surface finish treatment. In this embodiment, the second member b1 is welded to the first member h1. The boundary line k1 is also the welding position k2. Joints other than welding may be used.

The second member b1 has a weight wt. The weight wt is fixed inside the second member b1. The center of gravity of the weight wt is located on the toe side of the center of gravity of the head 100 . The center of gravity of the weight wt is positioned below the center of gravity of the head 100 . The specific gravity of the weight wt is greater than the specific gravity of the first member h1. The specific gravity of the weight wt is greater than the specific gravity of the second member b1.

FIG. 7 is a cross-sectional view along line AA in FIG. 8 is a cross-sectional view taken along line BB of FIG. 2. FIG. 9 is a cross-sectional view taken along line CC of FIG. 2. FIG.

As shown in FIGS. 7, 8, and 9, the head body hb1 (first member h1) has a back supporting portion 130 that supports the face plate f1 from the back side. The back support portion 130 is provided in the sole side region of the head main body hb1 (first member h1). The back support portion 130 is a convex portion (wall) extending from the toe side to the heel side (see FIGS. 4 and 5). The back support portion 130 protrudes upward from the inner surface of the sole 104 . The back support portion 130 is separated from the second member b1.

The bag support portion 130 has a bag receiving surface 132 . The back receiving surface 132 is the front surface (face side surface) of the back supporting portion 130 . The back receiving surface 132 forms a contact region Rc by contact with the outer peripheral edge portion 114 of the plate rear surface f12 (see FIG. 9). The back receiving surface 132 is in surface contact with the outer peripheral edge portion 114 (peripheral edge convex portion 116) of the plate rear surface f12. In this embodiment, the bag receiving surface 132 is flat.

Back support 130 has a rear surface 134 . A rear surface 134 is the rear surface of the back support portion 130 . The rear surface 134 is the surface opposite to the bag receiving surface 132 . In this embodiment, the rear surface 134 is planar.

The rear surface 134 is separated from the second member b1. The second member b1 has a rear portion 128 located on the back side of the rear surface 134 . The rear portion 128 is located on the back side of the back receiving surface 132 . The rear portion 128 is positioned on the back side of the contact region Rc. The rear portion 128 is part of the head body hb1. When the second member b1 is attached to the first member h1, the rear surface 134 cannot be visually recognized from the back side. When the second member b1 is not attached to the first member h1, the rear surface 134 can be viewed from the back side. In the state of the first member h1 alone, the rear surface 134 can be visually recognized from the back side.

The rear face 134 has a face perimeter edge 136 . When the back support portion 130 is located in the sole side region, the face peripheral side means the lower side. Edge 136 is the lower edge of rear surface 134 . In this embodiment, edge 136 is the intersection of the inner surface of sole 104 and rear surface 134 .

The contact region Rc has an edge 140 on the face center side and an edge 142 on the face peripheral side. In the back support portion 130 located in the sole side region, the face center side means the upper side. The end 140 is the upper end of the contact area Rc. The end 142 is the lower end of the contact area Rc.

A lower end 136 of the rear surface 134 is located below an upper end 140 of the contact area Rc (see FIGS. 7, 8 and 9).

The head 100 has a portion where the lower end 136 of the rear surface 134 is located below the lower end 142 of the contact area Rc (see FIG. 8). The head 100 has a portion where the lower end 136 of the rear surface 134 is located above the lower end 142 of the contact area Rc (see FIG. 9).

The sole 104 has a thin portion 150 on the back side of the rear surface 134 . Thin portion 150 is the thinnest portion of sole 104 . The thickness of the thin portion 150 is 4 mm or less. This thickness is measured along the vertical direction. The thin portion 150 forms part of the sole 104 . The outer surface of the thin portion 150 is the sole surface 104a. A lower end 136 of the rear surface 134 is the line of intersection between the inner surface of the thin portion 150 and the rear surface 134 .

The thin portion 150 extends from the lower end 136 of the rear surface 134 to the back side. The thin portion 150 connects the lower end 136 of the rear surface 134 and the second member b1. A rear end surface 152 of the thin portion 150 is joined to the second member b1.

As shown in FIG. 8, a gap 154 is provided between the back support portion 130 and the rear portion 128 . The back supporting portion 130 approaches the rear portion 128 due to the deformation caused by the impact. When the hitting face 102 flexes significantly, the back support 130 contacts the rear portion 128 . That is, the back support portion 130 may come into contact with the rear portion 128 due to the deflection of the hitting face 102 upon hitting. When the amount of displacement of the back support portion 130 reaches the width of the gap 154 in the face-back direction, the back support portion 130 contacts the rear portion 128 . The rear portion 128 prevents the back support portion 130 from being displaced beyond a predetermined amount. The rear portion 128 suppresses deterioration in durability due to excessive deflection of the face 102 . The rear portion 128 suppresses the COR to a predetermined value or less. The rear portion 128 prevents excessive COR and prevents the ball from flying too far.

The striking face 102 has specific measurement points where the back support 130 contacts the rear portion 128 in measuring COR. That is, when the COR is measured at this specific measurement point, the back support portion 130 contacts the rear portion 128 . A specific measurement point is any point on the hitting face 102 . The specific measurement point may be the face center. The specific measurement point may be the maximum rebound point of the striking face 102 . The maximum repulsion point is the point at which the COR is maximum. In a head having specific measurement points, the rear portion 128 can suppress excessive deformation of the hitting face 102, suppress deterioration of durability, and prevent excessive COR.

Preferably, the back support 130 contacts the rearwardly located portion 128 in measuring the COR at the point of maximum rebound. This contact effectively suppresses the COR at the point of maximum repulsion, and can improve durability. The COR at the point of maximum restitution is preferably 0.836 or less. The COR at specific measurement points is preferably 0.836 or less. A method for measuring COR will be described later. It is preferable that the COR at the point of maximum repulsion is equal to or lower than the COR of a baseline plate defined in the measurement method described later.

FIG. 10 is a cross-sectional view showing the top side portion of the head 200 of the second embodiment. The head 200 has a head body hb1 and a faceplate f1. The head main body hb1 constitutes a top surface 202. As shown in FIG.

A head main body hb1 of the head 200 has a back supporting portion 230 that supports the face plate f1 from the back side. The back support portion 230 is provided in the top side region of the head main body hb1. The back support portion 230 is a convex portion (wall) extending from the toe side to the heel side. The back support portion 230 protrudes downward.

The back support portion 230 has a back receiving surface 232 . The back receiving surface 232 is the front surface (face side surface) of the back support portion 230 . The back receiving surface 232 forms a contact region Rc by contact with the outer peripheral edge portion 214 of the plate rear surface f12. The back receiving surface 232 is in surface contact with the outer peripheral edge portion 214 of the plate rear surface f12.

Back support 230 has a rear surface 234 . A rear surface 234 is the rear surface of the back support 230 . The rear surface 234 is the surface opposite to the bag receiving surface 232 .

The rear face 234 has a face perimeter edge 236 . In this embodiment, the back supporting portion 230 is located in the top side area. Therefore, the face peripheral side means the upper side. Edge 236 is the upper edge of rear surface 234 .

The contact region Rc has an end 240 on the face center side. In this embodiment, the back supporting portion 230 is located in the top side area. Therefore, the face center side means the lower side. The end 240 is the lower end of the contact area Rc. An upper end 236 of the rear surface 234 is located above a lower end 240 of the contact area Rc.

As with the head 100 described above, this head 200 also satisfies the following configuration X.
[Configuration X]: The end of the rear surface on the face periphery side is located closer to the face periphery than the end of the contact area on the face center side.

As this configuration X, the following configuration X1, configuration X2, configuration X3, and configuration X4 are listed.
[Configuration X1]: The back supporting portion is located in the sole side region, and the lower end of the rear surface is located below the upper end of the contact region.
[Configuration X2]: The back supporting portion is located in the top side region, and the upper end of the rear surface is located above the lower end of the contact region.
[Configuration X3]: The back supporting portion is positioned in the toe side region, and the toe side end of the rear surface is positioned closer to the toe side than the heel side end of the contact region.
[Configuration X4]: The back supporting portion is positioned in the heel side region, and the heel side end of the rear surface is positioned closer to the heel side than the toe side end of the contact region.

The head 100 of the first embodiment is an example of a head that satisfies the configuration X1. The head 200 of the second embodiment is an example of a head that satisfies the configuration X2.

At the time of hitting, the face plate f1 undergoes flexural deformation toward the back side. Along with this flexural deformation, the back supporting portion may be deformed to fall toward the back (hereinafter also referred to as "falling deformation") starting from the end of the rear surface on the face periphery side. Configuration X promotes this falling deformation. As a result, the deformation of the face plate f1 is increased, and the resilience performance can be improved.

Configuration X enhances the resilience performance in the region near the location of configuration X in particular. The configuration X1 enhances the rebound performance especially on the underside of the hitting face. The configuration X2 particularly enhances the rebound performance on the upper side of the hitting face. The configuration X3 particularly enhances the rebound performance on the toe side of the hitting face. The configuration X4 particularly enhances the rebound performance on the heel side of the hitting face.

A head having configuration X has at least one selected from the group consisting of configuration X1, configuration X2, configuration X3, and configuration X4. The head may have two or more selected from the group consisting of configuration X1, configuration X2, configuration X3 and configuration X4. The head may have three or more selected from the group consisting of configuration X1, configuration X2, configuration X3 and configuration X4. The head may have configuration X1, configuration X2, configuration X3 and configuration X4. The head may have configuration X1 and configuration X2. The head may have configuration X3 and configuration X4.

The back support portion 130 does not have to be formed around the entire circumference of the opening 120 . There may be a portion around the opening 120 where the back support portion 130 is not formed. For example, there may be a portion where the back support portion 130 is not formed in the sole side region. A through hole penetrating through the sole 104 may be provided in a portion where the back support portion 130 is not formed, for example.

The central portion of the faceplate f1 is more likely to deform than the peripheral portion of the faceplate f1. The resilience performance of the peripheral portion tends to be lower than the resilience performance of the central portion. On the other hand, configuration X increases the deformation of the back supporting portion that abuts on the outer peripheral edge of the rear surface of the plate, thereby enhancing the rebound performance of the peripheral portion of the hitting face. As a result, the difference in coefficient of restitution between the peripheral portion and the central portion of the hitting face can be reduced.

FIG. 11 is a cross-sectional view of a head 300 of a comparative example. In this head 300, a face plate f1 is attached to the opening of the head main body hb1. In this head 300, the rigidity of the back supporting portion 302 in the sole side region is high. Therefore, the coefficient of restitution on the lower side of the hitting face is low. In contrast, the head 100 of the first embodiment having the configuration X1 has a higher coefficient of restitution on the lower side of the hitting face.

In particular, with an iron-type golf club head, the hitting point tends to be on the lower side (sole side). The configuration X1 can enhance the repulsion performance when the hitting point is on the lower side, and therefore effectively enhances the repulsion performance of the iron-type golf club head.

The thin portion 150 can reduce the rigidity of the base of the back support portion 130 and promote the falling deformation. The deformation of the face plate f1 is increased, and the resilience performance is enhanced. From this viewpoint, the thickness of the thin portion 150 is preferably 4 mm or less, more preferably 3 mm or less, and more preferably 2.5 mm or less. From the viewpoint of strength, the thickness of the thin portion 150 is preferably 0.5 mm or more, more preferably 1 mm or more. The thickness of the thin portion 150 is measured along the vertical direction.

A double arrow W1 in FIG. 8 indicates the width of the thin portion 150 in the face-back direction. From the viewpoint of facilitating collapse deformation of the back support portion 130 and enhancing resilience performance, the face-back direction width W1 of the thin portion 150 is preferably 1 mm or more, more preferably 2 mm or more, more preferably 3 mm or more, and 5 mm or more. more preferred. Considering the head size and head weight, the face-back direction width W1 of the thin portion 150 is preferably 20 mm or less, more preferably 18 mm or less, and even more preferably 16 mm or less.

As described above, the second member b1 is welded to the first member h1. A boundary line k1 between the first member h1 and the second member b1 is also the welding position k2. A welding position k2 is a welding position on the outer surface of the head.

A double arrow W3 in FIG. 8 indicates the distance between the welding position k2 and the end 136. In FIG. Distance W3 is measured along the face-back direction. In this embodiment, the distance W3 is equal to the width W1. A weld bead is formed at the welded portion of the boundary between the first member h1 and the second member b1. The portion where the weld bead is formed has increased rigidity. If the weld bead is too close to the end 136 , the collapse deformation of the back support portion 130 may be hindered due to the increased rigidity due to the weld bead. From this point of view, the distance W3 is preferably 1 mm or longer, more preferably 2 mm or longer, more preferably 3 mm or longer, and more preferably 5 mm or longer. Considering the head size, the distance W3 is preferably 20 mm or less, more preferably 18 mm or less, and even more preferably 16 mm or less.

A double arrow W4 in FIG. 8 indicates the distance between the upper end 140 of the contact area Rc and the lower end 136 of the rear surface 134 . This distance is measured along the vertical direction. From the viewpoint of facilitating falling deformation of the back support portion 130 and enhancing resilience performance, the distance W4 is preferably 0.5 mm or more, more preferably 1 mm or more, more preferably 2 mm or more, and more preferably 3 mm or more. If the contact region Rc is excessively large, deformation of the faceplate f1 can be suppressed. From this point of view, the distance W4 is preferably 10 mm or less, more preferably 8 mm or less, and more preferably 6 mm or less.

From the viewpoint of resilience performance, the thickness of the back supporting portion in the contact region Rc is preferably 4 mm or less, more preferably 3 mm or less, and even more preferably 2.5 mm or less. Considering the strength, the thickness of the back supporting portion in the contact region Rc is preferably 0.5 mm or more, more preferably 1 mm or more, and more preferably 1.2 mm or more. This thickness is measured along the face-back direction.

From the viewpoint of resilience performance, the length in the toe-heel direction of the portion that satisfies the configuration X is preferably large. A double arrow G1 in FIG. 1 indicates the length of the longest face line gv1 in the toe-heel direction. A double arrow L1 in FIG. 5 indicates the length in the toe-heel direction of the portion that satisfies the configuration X1. From the viewpoint of resilience performance, L1/G1 is preferably 0.5 or more, more preferably 0.7 or more, and more preferably 0.9 or more. L1/G1 is preferably 1.3 or less, more preferably 1.2 or less, and even more preferably 1.1 or less due to restrictions on head dimensions.

FIG. 12 is a rear view of the first member h1 according to the third embodiment. The first member h1 has a back support portion 330. As shown in FIG. A notch portion 332 is provided in the back support portion 330 . The missing portion 332 is formed by partially missing the back support portion 330 . In this embodiment, the number of cutouts 332 is one. The configuration of the head of the third embodiment is the same as that of the head 100 described above, except for the presence of the missing portion 332 .

The notch 332 forms a portion of the outer peripheral edge of the faceplate that is not supported by the back support 330 . Furthermore, the back support portion 330 is divided by the notch portion 332, and the rigidity of the back support portion 330 is lowered. As a result, the deformation of the face plate f1 increases, and the resilience performance increases.

In the third embodiment, the notch 332 is provided at a position corresponding to the face center. In other words, the existence range of the missing portion 332 in the toe-heel direction includes the position of the face center in the toe-heel direction. This cutout portion 332 enhances the resilience performance when the ball is hit below the center of the face.

FIG. 13 is a rear view of the first member h1 according to the fourth embodiment. The first member h1 has a back support portion 430. As shown in FIG. The head of the fourth embodiment is the same as the head 100 described above, except for the existence of a missing portion which will be described later.

In this embodiment, a plurality of notch portions are provided. The back support portion 430 is provided with a first notch portion 432 and a second notch portion 434 . The first notch 432 is provided on the heel side of the second notch 434 . The first missing portion 432 is provided on the heel side of the face center. The second notch 434 is provided on the toe side of the face center. The lacked portions 432 and 434 reduce the rigidity of the back support portion 430 . Especially, the rigidity of the portion between the cutout portion 432 and the cutout portion 434 is effectively reduced. As a result, the tilting deformation of the back support portion 430 is increased, and the resilience performance is improved.

Thus, one or more missing portions can improve the resilience performance.

A double-headed arrow S1 in FIG. 13 indicates the separation distance between the missing portions. When a plurality of cutouts are provided, the separation distance S1 between at least one set of cutouts adjacent to each other is preferably 10 mm or more, more preferably 15 mm or more. By increasing the separation distance S1, the length of the back supporting portion existing between the notched portions is increased. The portions between the missing portions are easily deformable and contribute to the improvement of the resilience performance. Considering the head size, the distance S1 is preferably 80 mm or less.

A double arrow W2 in FIG. 12 indicates the width of the missing portion. From the viewpoint of resilience performance, the width W2 of the chipped portion is preferably 1 mm or more. Considering the strength, it is preferable that the width W2 of the chipped portion is 15 mm or less. When the back support portion is located in the sole-side region, the width W2 of the missing portion is measured along the toe-heel direction.

From the viewpoint of resilience performance, it is preferable that the missing portion is provided in the existence range Rg of the longest face line gv1 (see FIG. 1). The existence range Rg of the longest face line gv1 is a range in the toe-heel direction, and is a range from the toe-side end Pt of the longest face line gv1 to the heel-side end Ph of the longest face line gv1. The missing portion 332 and the missing portions 432 and 434 described above are provided in the existence range Rg of the longest face line gv1.

The notch portion may be formed over the entire height direction of the back support portion. In other words, the missing portion may extend from the face center side end of the rear surface to the face peripheral side end of the rear surface. The cutout portion of the sole-side region may extend from the upper end of the back support portion to the lower end of the rear surface. In this case, the collapse deformation of the back supporting portion is further promoted.

In the head 100 described above, the back supporting portion 130 is provided over the entire circumference of the opening 120 . The annularly connected back support portion 130 is difficult to deform. By providing the back support portion 130 with the notch portion, the rigidity of the back support portion 130 can be effectively reduced.

14A to 14D are process diagrams showing a method of manufacturing the head 100. FIG. The first member h1 has a crimping projection 500 before the faceplate f1 is attached. The crimping convex portion 500 is a convex portion (wall portion) provided along the outer edge of the opening 120 . The crimping protrusion 500 is provided along the entire periphery of the opening 120 . The crimping convex portion 500 is provided on the hitting face 102 . On the other hand, the plate front surface f11 of the face plate f1 has a stepped portion 502 on its outer edge. At the step portion 502, the plate front surface f11 is retracted.

This manufacturing method includes the following steps (see FIG. 14).
(1) A first step St1 of placing the face plate f1 in the opening 120 of the first member h1.
(2) A second step St2 of plastically deforming the crimped convex portion 500 to form the holding portion 504 on the face side of the stepped portion 502 .
(3) A third step St3 of joining the second member b1 to the first member h1.

The second step St2 is performed after the first step St1. The third step St3 is performed after the second step St2.

The second step St2 is also called a crimping process. In this crimping process, the crimping protrusion 500 is crushed. As a result, the holding portion 504 is formed. In the head 100, a holding portion 504 is formed around the entire circumference of the faceplate f1. In this crimping process, the face plate f1 is pressed when the crimping projections 500 are crushed. This pressing force is transmitted to the bag receiving surface 132 . In this crimping process, the back receiving surface 132 is pressed by the face plate f1. In the crimping process, the crimping convex portion 500 is crushed and the face plate f1 is also pressed. When the face plate f1 is pressed, the back support portion 130 is pressed. A strong force is applied to the back support portion 130 .

Thus, the head 100 is manufactured including the following process Y.
[Step Y]: A step in which the back receiving surface 132 is pressed by the face plate f1.
The caulking process described above is an example of this process Y.

In step Y, the back support portion 130 is pressed by the faceplate f1. Therefore, the back support portion 130 needs to have rigidity and strength to withstand this pressing force. From this point of view, a highly rigid back support like the back support 302 in FIG. 11 is preferable. However, in this case, the back supporting portion is less likely to deform when hit, and the resilience performance is reduced.

The process Y is performed on the first member h1 before the second member b1 is attached. As described above, the second member b1 has the rear portion 128 positioned on the back side of the rear surface 134 . This rear portion 128 becomes an obstacle when supporting the rear surface 134 from the back side. In this manufacturing method, the step Y is performed without the second member b1 having the rear portion 128, so the rear surface 134 can be easily supported from the back side. Therefore, even if the rigidity of the back supporting portion 130 is low, the step Y can be smoothly performed.

Therefore, preferably, the head 100 is manufactured including the following process Y1.
[Step Y1]: A step of pressing the back receiving surface 132 by the face plate f1 while supporting the rear surface 134 with a jig.
From the viewpoint of facilitating the support of the rear surface 134, this step Y1 is preferably performed on the first member h1 to which the second member b1 is not attached.

A head in which the face plate f1 is fixed to the head main body hb1 by caulking is essentially manufactured including the process Y described above. Therefore, in this head, the head body hb1 preferably has the first member h1 and the second member b1.

The process Y is not limited to the caulking process. For example, a head in which the face plate f1 is press-fitted into the opening 120 of the first member h1 is manufactured including the process Y described above. In this head, the face plate f1 is press-fitted into the opening of the first member h1 in step St1. In this press fitting, the face plate f1 is fitted into the opening 120 while the opening inner surface 122 is pressed by the plate side surface f13. Also in this head, the head body hb1 preferably has the first member h1 and the second member b1.

A head in which the face plate f1 is adhered to the back receiving surface 132 with an adhesive is manufactured including the process Y described above. This is because, in this bonding, the adhesive is cured while the faceplate f1 is pressed against the back receiving surface 132 . Therefore, in this head as well, the head body hb1 preferably has the first member h1 and the second member b1. This adhesion is preferably adopted when the material of the face plate f1 is non-metal such as FRP (fiber reinforced plastic).

The head in which the face plate f1 is pressure-bonded to the back receiving surface 132 is manufactured including the process Y described above. Therefore, in this head as well, the head body hb1 preferably has the first member h1 and the second member b1.

[Example]
A head identical to the head 100 of the first embodiment was produced. The first member h1 was produced by casting (lost wax precision casting). The material of the first member h1 was stainless steel. The face plate f1 was produced by subjecting a rolled material to NC processing. The material of the face plate f1 was a titanium alloy. The second member b1 was produced by casting (lost wax precision casting). The material of the second member b1 was stainless steel. The weight wt was made by powder sintering. The material of the weight wt was a tungsten-nickel alloy. The weight wt was fixed with an adhesive to a weight pocket provided in the second member b1.

The face plate f1 was press-fitted into the opening 120 of the first member h1 while supporting the back supporting portion 130 with a jig from the back side. Next, while supporting the back supporting portion 130 from the back side with a jig, the crimping convex portion 500 of the first member h1 was plastically deformed to form the holding portion 504 on the face side of the stepped portion 502 . After that, the second member b1 was welded to the first member h1, and surface finishing such as polishing was performed to obtain a head. The number of this head was a 6-iron.

[Comparative example]
A head identical to the head 300 shown in FIG. 11 was fabricated. A comparative head was obtained in the same manner as in the example except that the structure of the head body hb1 was as shown in FIG.

[evaluation]
COR was measured at three points: the face center (FC point), a point 5 mm below the face center (D5 point), and a point 10 mm below the face center (D10 point). COR means Coefficient Of Restitution. ＣＯＲは、ＵＳＧＡ（Ｕｎｉｔｅｄ Ｓｔａｔｅｓ Ｇｏｌｆ Ａｓｓｏｃｉａｔｉｏｎ：全米ゴルフ協会）で規定されている「Ｉｎｔｅｒｉｍ Ｐｒｏｃｅｄｕｒｅ ｆｏｒ Ｍｅａｓｕｒｉｎｇ ｔｈｅ Ｃｏｅｆｆｉｃｉｅｎｔ ｏｆ Ｒｅｓｔｉｔｕｔｉｏｎ ｏｆ ａｎ Ｉｒｏｎ Ｃｌｕｂｈｅａｄ Ｒｅｌａｔｉｖｅ ｔｏ ａ Ｂａｓｅｌｉｎｅ Ｐｌａｔｅ Ｒｅｖｉｓｉｏｎ １．３ Ｊａｎｕａｒｙ １， ２００６」に基づいて測定be done.

In Examples and Comparative Examples, the ratio (%) of COR to the value at the face center was as follows.

[Example]
・FC point: 100%
・D5 points: 102%
・D10 points: 100%

[Comparative example]
・FC point: 100%
・D5 points: 101%
・D10 points: 99%

Thus, in the example, the rate of decrease in COR at the hitting point on the lower side is lower than in the comparative example.

The following remarks are disclosed with respect to the above-described embodiments.
[Appendix 1]
a head body having a sole; and a face plate fixed to the head body,
The face plate has a plate front surface forming part of a hitting face, a plate rear surface opposite to the plate front surface, and a plate side surface extending between the plate front surface and the plate rear surface. cage,
The head body has an opening in which the face plate is arranged and a back supporting portion that supports the face plate from the back side,
The bag support portion has a bag receiving surface forming a contact area by contact with the outer peripheral edge of the rear surface of the plate, and a rear surface opposite to the bag receiving surface,
A golf club head in which the end of the rear surface on the face periphery side is positioned closer to the face periphery than the end of the contact area on the face center side.
[Appendix 2]
The back support portion is in contact with the outer peripheral edge portion of the sole-side region of the rear surface of the plate,
1. The golf club head according to appendix 1, wherein the lower end of the rear surface is located below the upper end of the contact area.
[Appendix 3]
The sole has a thin portion on the back side of the rear surface,
the lower end of the rear surface is the line of intersection between the inner surface of the thin portion and the rear surface;
2. The golf club head according to appendix 2, wherein the thin portion has a thickness of 4 mm or less.
[Appendix 4]
4. The golf club head according to appendix 2 or 3, which is an iron type golf club head.
[Appendix 5]
5. The golf club head according to any one of Appendices 1 to 4, further comprising a missing portion formed by partially missing the back support portion.
[Appendix 6]
the head main body has a rear portion disposed on the back side of the back support portion and a gap formed between the back support portion and the rear portion;
6. The golf club head according to any one of Appendices 1 to 5, wherein the hitting face has a specific measurement point at which the back supporting portion contacts the rear portion in measuring COR.
[Appendix 7]
the head body includes a first member including the back support portion and to which the face plate is fixed; and a second member joined to the first member,
7. The golf club head according to any one of Appendices 1 to 6, wherein the second member has a rear portion located on the back side of the back support portion.

DESCRIPTION OF SYMBOLS 100... Golf club head 102... Hitting face 104... Sole 106... Top surface 108... Hosel 120... Opening of head main body 128... Rear part located on the back side of the rear surface Placement portion 130 Back support portion 132 Back receiving surface 134 Rear surface 136 End of the rear surface on the peripheral side of the face 140 End of the contact area on the center side of the face 150 Thin portion f1 Face plate f11 Plate front surface f12 Plate rear surface hb1 Head body h1 First member b1 Second member Rc Contact area

Claims (10)

a head body having a sole; and a face plate fixed to the head body,
The face plate has a plate front surface forming part of a hitting face, a plate rear surface opposite to the plate front surface, and a plate side surface extending between the plate front surface and the plate rear surface. cage,
The head body has an opening in which the face plate is arranged and a back supporting portion that supports the face plate from the back side,
The bag support portion has a bag receiving surface forming a contact area by contact with the outer peripheral edge of the rear surface of the plate, and a rear surface opposite to the bag receiving surface,
an end of the rear surface on the face periphery side is located closer to the face periphery than an end of the contact area on the face center side ;
A golf club head in which the back receiving surface and the rear surface extend to the face center side from the contact area . The back support portion is in contact with the outer peripheral edge portion of the sole-side region of the rear surface of the plate,
the lower end of the rear surface is positioned below the upper end of the contact area;
2. The golf club head of claim 1 , wherein the lower end of the rear surface is the line of intersection between the inner surface of the sole and the rear surface. a head body having a sole; and a face plate fixed to the head body,
The face plate has a plate front surface forming part of a hitting face, a plate rear surface opposite to the plate front surface, and a plate side surface extending between the plate front surface and the plate rear surface. cage,
The head body has an opening in which the face plate is arranged and a back supporting portion that supports the face plate from the back side,
The bag support portion has a bag receiving surface forming a contact area by contact with the outer peripheral edge of the rear surface of the plate, and a rear surface opposite to the bag receiving surface,
an end of the rear surface on the face periphery side is located closer to the face periphery than an end of the contact area on the face center side ;
The back support portion is in contact with the outer peripheral edge portion of the sole-side region of the rear surface of the plate,
the lower end of the rear surface is positioned below the upper end of the contact area;
the lower end of the rear surface is the line of intersection between the inner surface of the sole and the rear surface;
A golf club head having a portion where the lower end of the rear surface is located above the lower end of the contact area . a head body having a sole; and a face plate fixed to the head body,
The face plate has a plate front surface forming part of a hitting face, a plate rear surface opposite to the plate front surface, and a plate side surface extending between the plate front surface and the plate rear surface. cage,
The head body has an opening in which the face plate is arranged and a back supporting portion that supports the face plate from the back side,
The bag support portion has a bag receiving surface forming a contact area by contact with the outer peripheral edge of the rear surface of the plate, and a rear surface opposite to the bag receiving surface,
an end of the rear surface on the face periphery side is located closer to the face periphery than an end of the contact area on the face center side ;
The back support portion is in contact with the outer peripheral edge portion of the sole-side region of the rear surface of the plate,
the lower end of the rear surface is positioned below the upper end of the contact area;
the lower end of the rear surface is the line of intersection between the inner surface of the sole and the rear surface;
the head body includes a first member including the back support portion and to which the face plate is fixed; and a second member welded to the first member,
The second member has a rear portion arranged on the back side of the back support portion,
A golf club head, wherein a distance in a face-back direction between a welding position of a boundary between the first member and the second member and a lower end of the rear surface is 1 mm or more. a head body having a sole; and a face plate fixed to the head body,
The face plate has a plate front surface forming part of a hitting face, a plate rear surface opposite to the plate front surface, and a plate side surface extending between the plate front surface and the plate rear surface. cage,
The head body has an opening in which the face plate is arranged and a back supporting portion that supports the face plate from the back side,
The bag support portion has a bag receiving surface forming a contact area by contact with the outer peripheral edge of the rear surface of the plate, and a rear surface opposite to the bag receiving surface,
an end of the rear surface on the face periphery side is located closer to the face periphery than an end of the contact area on the face center side ;
The back support portion is in contact with the outer peripheral edge portion of the sole-side region of the rear surface of the plate,
the lower end of the rear surface is positioned below the upper end of the contact area;
the lower end of the rear surface is the line of intersection between the inner surface of the sole and the rear surface;
The back receiving surface and the rear surface extend above the contact area,
A golf club head, wherein the vertical distance between the upper end of the contact area and the lower end of the rear surface is 0.5 mm or more . 6. The golf club head according to any one of claims 3 to 5 , wherein the back receiving surface and the rear surface extend from the contact area to the face center side. The sole has a thin portion with a thickness of 4 mm or less on the back side of the rear surface,
6. The golf club head according to any one of claims 2 to 5 , wherein the lower end of the rear surface is a line of intersection between the inner surface of the thin portion and the rear surface. The golf club head according to any one of claims 1 to 7, wherein the thickness of the back supporting portion in the face-back direction is 4 mm or less. 9. The golf club head according to claim 8 , wherein the height of the back support portion in the vertical direction is greater than the thickness of the back support portion in the face-back direction . the head body includes a first member including the back support portion and to which the face plate is fixed; and a second member joined to the first member,
The second member has a rear portion arranged on the back side of the back support portion,
6. A golf club head according to claim 1 , wherein a gap is provided between said back supporting portion and said rear portion.

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