Golf ball and golf ball manufacturing method
View Patent ↗A golf ball including a spherical core and a cover. The cover has a nominal thickness of 0.1 mm to 1.2 mm. A dimple is formed on the surface of the cover. A concave portion is formed on the surface of the core. The position of the concave portion corresponds to that of the dimple. The golf ball is obtained by forming the core by means of a mold having a large number of projections provided on a cavity surface thereof. By the projections, the concave portion is formed. When the cover is to be formed, the position of the core is determined in such a manner that the projections for forming the dimple correspond to the concave portions.
1. A golf ball comprising:
a solid core, and
a cover having a nominal thickness of 0.1 mm to 1.2 mm disposed on the surface of the solid core,
said core being provided with concave dimples on its outer surface and said cover being provided with concave dimples on its outer surface, said concave dimples on the outer surface of the core corresponding to and aligned with the concave dimples on the cover surrounding the core,
wherein the thickness of the cover under the deepest portion of each dimple is in the range of 60 to 140% of the normal thickness of the cover.
2. The golf ball according to claim 1 , wherein the cover has a thickness of 0.3 mm to 1.2 mm.
3. The golf ball according to claim 1 , wherein the cover has a thickness of 0.3 mm to 1.0 mm.
4. The golf ball according to claim 1 , wherein the dimples have a shape which is circular, non-circular, or both circular and non-circular.
5. The golf ball according to claim 1 , wherein the core comprises more than one layer.
6. A golf ball comprising:
a solid core, and
a cover having a nominal thickness of 0.1 mm to 1.2 mm disposed on the surface of the solid core,
said core being provided with concave dimples on its outer surface and said cover being provided with concave dimples on its outer surface, said concave dimples on the outer surface of the core corresponding to and aligned with the concave dimples on the cover surrounding the core,
wherein the thickness of the cover under the deepest portion of each dimple is in the range of 80 to 120% of the normal thickness of the cover.
7. The golf ball according to claim 6 , wherein the cover has a thickness of 0.3 mm to 1.2 mm.
8. The golf ball according to claim 6 , wherein the cover has a thickness of 0.3 mm to 1.0 mm.
9. The golf ball according to claim 6 , wherein the dimples have a shape which is circular, non-circular, or both circular and non-circular.
10. The golf ball according to claim 6 , wherein the core comprises more than one layer.
11. A golf ball comprising:
a solid core, and
a cover having a nominal thickness of 0.1 mm to 1.2 mm disposed on the surface of the solid core,
said core being provided with concave dimples on its outer surface and said cover being provided with concave dimples on its outer surface, said concave dimples on the outer surface of the core corresponding to and aligned with the concave dimples on the cover surrounding the core,
wherein each concave dimple has a diameter which is 60% to 140% of the diameter of a corresponding dimple with which it is aligned.
12. The golf ball according to claim 11 , wherein the cover has a thickness of 0.3 mm to 1.2 mm.
13. The golf ball according to claim 11 , wherein the cover has a thickness of 0.3 mm to 1.0 mm.
14. The golf ball according to claim 11 , wherein the dimples have a shape which is circular, non-circular, or both circular and non-circular.
15. The golf ball according to claim 11 , wherein the core comprises more than one layer.
16. A golf ball comprising:
a solid core, and
a cover having a nominal thickness of 0.1 mm to 1.2 mm disposed on the surface of the solid core,
said core being provided with concave dimples on its outer surface and said cover being provided with concave dimples on its outer surface, said concave dimples on the outer surface of the core corresponding to and aligned with the concave dimples on the cover surrounding the core,
wherein each concave dimple has a diameter which is 80% to 120% of the diameter of a corresponding dimple with which it is aligned.
17. The golf ball according to claim 16 , wherein the cover has a thickness of 0.3 mm to 1.2 mm.
18. The golf ball according to claim 16 , wherein the cover has a thickness of 0.3 mm to 1.0 mm.
19. The golf ball according to claim 16 , wherein the dimples have a shape which is circular, non-circular, or both circular and non-circular.
20. The golf ball according to claim 16 , wherein the core comprises more than one layer.
21. A golf ball comprising:
a solid core, and
a cover having a nominal thickness of 0.1 mm to 1.2 mm disposed on the surface of the solid core,
said core being provided with concave dimples on its outer surface and said cover being provided with concave dimples on its outer surface, said concave dimples on the outer surface of the core corresponding to and aligned with the concave dimples on the cover surrounding the core,
wherein the depth of the dimple in the core is 60 to 140% of the depth of the dimple in the cover.
22. The golf ball according to claim 21 , wherein the cover has a thickness of 0.3 mm to 1.2 mm.
23. The golf ball according to claim 21 , wherein the cover has a thickness of 0.3 mm to 1.0 mm.
24. The golf ball according to claim 21 , wherein the dimples have a shape which is circular, non-circular, or both circular and non-circular.
25. The golf ball according to claim 21 , wherein the core comprises more than one layer.
26. A golf ball comprising:
a solid core, and
a cover having a nominal thickness of 0.1 mm to 1.2 mm disposed on the surface of the solid core,
said core being provided with concave dimples on its outer surface and said cover being provided with concave dimples on its outer surface, said concave dimples on the outer surface of the core corresponding to and aligned with the concave dimples on the cover surrounding the core,
wherein the depth of the dimple in the core is 80% to 120% of the depth of the dimple in the cover.
27. The golf ball according to claim 26 , wherein the cover has a thickness of 0.3 mm to 1.2 mm.
28. The golf ball according to claim 26 , wherein the cover has a thickness of 0.3 mm to 1.0 mm.
29. The golf ball according to claim 26 , wherein the dimples have a shape which is circular, non-circular, or both circular and non-circular.
30. The golf ball according to claim 26 , wherein the core comprises more than one layer.