A golf ball has a large number of dimples on a surface thereof. The golf ball meets the following mathematical formula (I): Su ≦9.0* So −6.04 (I), Where: So represents a ratio of a sum of spherical surface areas of all the dimples to a surface area of a phantom sphere of the golf ball; and Su represents a standard deviation (mm 2 ) of the spherical surface areas of all the dimples. Preferably, the ratio So is equal to or greater than 0.780. Preferably, the standard deviation Su is equal to or less than 2.150 mm 2 . Preferably, a number of the dimples is equal to or greater than 300 but equal to or less than 390. Preferably, an average Sa of the spherical surface areas s of all the dimples is equal to or greater than 14.00 mm 2 .
1. A golf ball having a plurality of dimples on a surface thereof, wherein
a ratio So of a sum of spherical surface areas of all the dimples to a surface area of a phantom sphere of the golf ball is equal to or greater than 0.780 and less than or equal to 0.95, at least one of the plurality of dimples has a spherical surface area differing from another one of the plurality of dimples, and
the golf ball meets the following mathematical formula (I):
Su≦ 9.0* So− 6.04 (I),
where Su represents a standard deviation (mm 2 ) of the spherical surface areas of all the dimples.
2. The golf ball according to claim 1 , wherein the ratio So is equal to or greater than 0.840.
3. The golf ball according to claim 1 , wherein the standard deviation Su is equal to or less than 2.150 mm 2 .
4. The golf ball according to claim 1 , wherein the standard deviation Su is equal to or less than 1.946 mm 2 .
5. The golf ball according to claim 1 , wherein a number of the dimples is equal to or greater than 300 but equal to or less than 390.
6. The golf ball according to claim 1 , wherein an average Sa of the spherical surface areas of all the dimples is equal to or greater than 14.00 mm 2 .
7. The golf ball according to claim 1 , wherein the golf ball has dimples whose contours are non-circular.
8. The golf ball according to claim 7 , wherein each dimple has a contour shape different from those of any other dimples.
9. The golf ball according to claim 1 , wherein the golf ball further meets the following mathematical formula (II):
Su≦ 9.0* So− 6.25 (II).
10. The golf ball according to claim 1 ,
wherein the golf ball further meets the following mathematical formula (III):
Su≦ 9.0* So− 6.46 (III).
11. The golf ball according to claim 1 , wherein the golf ball further meets the following mathematical formula (IV):
Su≦ 9.0* So− 6.67 (IV).
12. The golf ball according to claim 1 , wherein a number of types of dimples whose contour shapes are different from one another is equal to or greater than 50.