Wood-type golf club head
View Patent ↗A wood-type golf club head comprises a face portion having a face for striking a ball. The face comprises a first region having a surface roughness and a second region having a surface roughness larger than that of the first region. The first region is positioned centrally in a toe-heel direction of the face and in an upper side of the face. The second region is positioned adjacently to the first region on a toe side, a heel side and a lower side of the first region and the second region is formed in a U-shape in the front view of the head.
1. A wood-type golf club head comprising:
a face portion having a face for striking a ball,
the face comprising a first region having a surface roughness and a second region having a surface roughness larger than that of the first region,
wherein
the first region is positioned centrally in a toe-heel direction of the face and in an upper side of the face, and
the second region is positioned adjacently to the first region on a toe side, a heel side and a lower side of the first region and the second region is formed in a U-shape in the front view of the head.
2. The wood-type golf club head according to claim 1 , wherein
a toe side part and a heel side part of the second region extend to an upper edge of the face.
3. The wood-type golf club head according to claim 2 , wherein
the boundary between the first region and the second region is curved convexly toward a lower side of the face in an arc in the front view of the head.
4. The wood-type golf club head according to claim 3 ,
wherein
the lowest point on the first region is located at a position not higher than a point at ⅔ of the maximum height of the face.
5. The wood-type golf club head according to claim 2 , wherein
the lowest point on the first region is located at a position not lower than a point at ½ of the maximum height of the face.
6. The wood-type golf club head according to claim 2 , wherein
the lowest point on the first region is located at a position not higher than a point at ⅔ of the maximum height of the face.
7. The wood-type golf club head according to claim 1 , wherein
the boundary between the first region and the second region is curved convexly toward a lower side of the face in an arc in the front view of the head.
8. The wood-type golf club head according to claim 7 , wherein
the lowest point on the first region is located at a position not lower than a point at ½ of the maximum height of the face.
9. The wood-type golf club head according to claim 7 , wherein
the lowest point on the first region is located at a position not higher than a point at ⅔ of the maximum height of the face.
10. The wood-type golf club head according to claim 1 , wherein
the lowest point on the first region is located at a position not lower than a point at ½ of the maximum height of the face.
11. The wood-type golf club head according to claim 1 , wherein
the lowest point on the first region is located at a position not higher than a point at ⅔ of the maximum height of the face.
12. The wood-type golf club head according to claim 1 , wherein
a moment of inertia of the head about a vertical axis passing through the center of gravity of the head is from 3500 to 6000 (g sq. cm), and
the face is provided with a bulge having a radius of from 10 to 16 inches.
13. The wood-type golf club head according to claim 1 , wherein
the difference in the arithmetic average roughness Ra between the first region and the second region is not less than 0.5 micrometers, and
the difference in the maximum height roughness Rz between the first region and the second region is not less than 5 micrometers.
14. The wood-type golf club head according to claim 1 , wherein
the difference in the arithmetic average roughness Ra between the first region and the second region is not less than 0.5 micrometers and not more than 4.0 micrometers, and
the difference in the maximum height roughness Rz between the first region and the second region is not less than 5 micrometers and not more than 15 micrometers.