| 摘要 |
PROBLEM TO BE SOLVED: To provide a golf ball having excellent flight distance performance and aerodynamic symmetry.SOLUTION: A golf ball 2 has a large number of dimples 10 on a surface thereof. The contours of the dimples 10 are non-circular. A standard deviation of areas of the dimples 10 is equal to or less than 1.7 mm. A ratio of a total area of the dimples 10 relative to a surface area of a phantom sphere of the golf ball 2 is equal to or greater than 80%. By comparting lines CS obtained by projecting sides of a regular dodecahedron, which is inscribed in the phantom sphere, onto the phantom sphere, a surface of the phantom sphere can be divided into 12 units Ut each of which meets the following mathematical formula (I): -2≤(Nt/12)-Nu≤2 (I), where Nt represents the total number of the dimples 10 and Nu represents the number of the dimples 10 on one unit Ut.SELECTED DRAWING: Figure 3 |
