| CPC A63B 53/0408 (2020.08) [A63B 53/0466 (2013.01); A63B 2209/023 (2013.01)] | 19 Claims |
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1. A golf club head being hollow and having a head outer surface, a head inner surface, and a wall thickness that is a thickness between the head inner surface and the head outer surface, the golf club head comprising:
a body member that has an opening; and
a face member that includes a striking face and a face inner surface, and closes the opening,
wherein
the face member includes a face portion that forms the striking face, a face center that is a center of the striking face, and a peripheral portion that extends from a peripheral edge of the face portion toward a back side of the golf club head,
the peripheral portion of the face member is welded to the body member,
a weld bead that juts from the head inner surface is formed at a boundary position between the peripheral portion and the body member,
the wall thickness at a face-side end point of the weld bead is greater than the wall thickness at a body-side end point of the weld bead,
the peripheral portion has a length of greater than or equal to 2.5 mm and less than or equal to 6 mm,
in a vertical cross section of the golf club head, when a tangent line to a cross-sectional contour line of the striking face at a midpoint Pa of the cross-sectional contour line of the striking face is defined as tangent line Ta, a point that is positioned on the head inner surface and that corresponds to the midpoint Pa is defined as a point Pb, and a straight line that passes through the point Pb and is parallel to the tangent line Ta is defined as straight line Tb, then the weld bead is located on the back side with respect to the straight line Tb,
when a direction of a normal line that is normal to the striking face at the midpoint Pa is defined as a face normal direction, the length of the peripheral portion is a length measured from the peripheral edge of the face portion in the face normal direction,
the peripheral portion includes a sole-side peripheral portion that is formed in a sole-side part of the face member, and a crown-side peripheral portion that is formed in a crown-side part of the face member,
when a boundary point between the sole-side peripheral portion and the body member on the head outer surface is defined as a point P2, a distance in an up-down direction between the point P2 and a ground plane of the golf club head in the vertical cross section passing through the face center is greater than or equal to 1.2 mm, and
the weld bead formed at the boundary position between the crown-side peripheral portion and the body member is located on a lower side with respect to the head inner surface at a position corresponding to a position of an uppermost point of a crown portion of the golf club head.
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