Golf club head
View Patent ↗When a length of a cross section CS 1 in a face-back direction is defined as L; a point being 0.1L from a forefront point Mz 2 of the cross section and positioned on an outer surface of the sole is defined as Ma; a point being 0.2L from a backmost point Mk 2 of the cross section and positioned on the outer surface of the sole is defined as Md; intersection points of lines and the outer surface of the sole are defined as a point Mb and a point Mc from a face side in order, the lines equally dividing a distance between the point Ma and the point Md into three in the face-back direction; a distance of a cross section CS 2 in the toe-heel direction is defined as W; intersection points of lines and the outer surface of the sole are defined as a point Mp, a point Mq, and a point Mr from a toe side in order, the lines equally dividing the distance W into four in the toe-heel direction; a radius of a circle passing through the point Ma, the point Mb, and the point Mc is defined as Ra; a radius of a circle passing through the point Mb, the point Mc, and the point Md is defined as Rb; and a radius of a circle passing through the point Mp, the point Mq, and the point Mr is defined as Rc, Ra>Rb>Rc is satisfied.
1. A golf club head comprising a face, a crown, and a sole, wherein when
a length of a cross section CS 1 in a face-back direction is defined as L, the cross section CS 1 positioned at a center position in a toe-heel direction; a point being 0.1 L from a forefront point of the cross section in the face-back direction and positioned on an outer surface of the sole is defined as Ma;
a point being 0.2L from a backmost point of the cross section in the face-back direction and positioned on the outer surface of the sole is defined as Md;
intersection points of lines and the outer surface of the sole are defined as a point Mb and a point Mc from a face side in order, the lines equally dividing a distance between the point Ma and the point Md into three in the face-back direction;
a distance of a cross section CS 2 in the toe-heel direction is defined as W, the cross section CS 2 being 20 mm from a forefront point of the head and being parallel to the toe-heel direction;
intersection points of lines and the outer surface of the sole are defined as a point Mp, a point Mq, and a point Mr from a toe side in order, the lines equally dividing the distance W into four in the toe-heel direction, then
a radius of a circle passing through the point Ma, the point Mb, and the point Mc is defined as Ra, wherein the radius Ra is equal to or greater than 250 (mm);
a radius of a circle passing through the point Mb, the point Mc, and the point Md is defined as Rb, wherein the radius Rb is equal to or less than 200 (mm); and
a radius of a circle passing through the point Mp, the point Mq, and the point Mr is defined as Rc, wherein the radius Rc is equal to or less than 130 (mm), and
a ratio [Ra/Rb] is equal to or greater than 3; a ratio [Rb/Rc] is 1.1 or greater and 3 or less; and a ratio [Ra/Rc] is equal to or greater than 4.
2. The golf club head according to claim 1 , wherein a rib is provided on an inner surface of the sole.
3. The golf club head according to claim 2 , wherein when an angle between an extending direction of the rib and the toe-heel direction is θ 1 (degree), an absolute value of the angle θ 1 is equal to or less than 20 degrees.
4. The golf club head according to claim 2 , wherein when an angle between an extending direction of the rib and the face-back direction is θ 2 (degree), an absolute value of the angle θ 2 is equal to or less than 20 degrees.
5. The golf club head according to claim 2 , wherein a first rib is provided so that the absolute value of the angle θ 1 with respect to the toe-heel direction is equal to or less than 20 degrees, and a second rib is provided so that the absolute value of the angle θ 2 with respect to the face-back direction is equal to or less than 20 degrees.
6. The golf club head according to claim 2 , wherein a rib height Hr of the rib is 1 mm or greater and 10 mm or less.
7. The golf club head according to claim 2 , wherein a rib width Wr of the rib is 0.5 mm or greater and 10 mm or less.
8. The golf club head according to claim 1 , wherein when a point at which a minute section curvature radius Rs 1 is minimal between the point Mc and the point Md in the cross section CS 1 is defined as Me, the point Me is positioned on a back side from the point Mc.
9. The golf club head according to claim 1 , wherein when a point at which a minute section curvature radius Rs 1 is minimal between the point Mc and the point Md in the cross section CS 1 is defined as Me, the sole has a projection part positioned on a back side from the point Me.
10. The golf club head according to claim 1 , wherein when a minute section curvature radius Rs 2 is defined in all cross sections parallel to the cross section CS 2 , the minute section curvature radius Rs 2 is 50 mm or greater and 300 mm or less at all positions of the outer surface of the sole.
11. The golf club head according to claim 1 , wherein the distance W is 100 mm or greater and less than 127 mm.
12. The golf club head according to claim 1 , wherein a volume of the head is 400 cc or greater and 470 cc or less.
13. The golf club head according to claim 1 , wherein when a point at which a minute section curvature radius Rs 1 is minimal between the point Mc and the point Md in the cross section CS 1 is defined as Me; a point positioned on the cross section CS 1 and being L/2 (mm) from the forefront point Mz 2 of the cross section in the face-back direction is defined as a sole central point Sc; and a distance between the sole central point Sc and the point Me in the face-back direction is defined as De (mm), the distance De is −20 (mm) or greater and +10 mm or less, the distance De represented by plus(+) when the point Me is positioned on a back side from the point Sc and represented by minus(−) when the point Me is positioned on a face side from the point Sc.