Golf ball

Abstract

A golf ball 2 has a plurality of dimples on a surface thereof. A ratio So of a sum of areas of the dimples relative to a surface area of a phantom sphere of the golf ball is equal to or greater than 81.0%. A ratio Rs of a number of the dimples each having a diameter of equal to or greater than 9.60% but equal to or less than 10.37%, of a diameter of the golf ball, relative to a total number of the dimples, is equal to or greater than 50%. A dimple pattern of each hemisphere of the phantom sphere includes three units that are rotationally symmetrical to each other. A dimple pattern of each unit includes two small units that are mirror-symmetrical to each other. The golf ball meets the following mathematical formula (1). Rs ≧−2.5* So +273  (1)

What is claimed is: 
     
         1 . A golf ball having a plurality of dimples on a surface thereof, wherein
 a ratio So of a sum of areas of the dimples relative to a surface area of a phantom sphere of the golf ball is equal to or greater than 81.0%,   a ratio Rs of a number of the dimples each having a diameter of equal to or greater than 9.60% but equal to or less than 10.37%, of a diameter of the golf ball, relative to a total number of the dimples, is equal to or greater than 50%,   a dimple pattern of each hemisphere of the phantom sphere includes three units that are rotationally symmetrical to each other,   a dimple pattern of each unit includes two small units that are mirror-symmetrical to each other, and   the golf ball meets the following mathematical formula (1):
     Rs≧− 2.5* So+ 273  (1).
 
   
     
     
         2 . The golf ball according to  claim 1 , wherein the golf ball meets the following mathematical formula (2):
     Rs≧− 2.5* So+ 278  (2).
   
     
     
         3 . The golf ball according to  claim 2 , wherein the golf ball meets the following mathematical formula (3):
     Rs≧− 2.5* So+ 283  (3).
   
     
     
         4 . The golf ball according to  claim 1 , wherein
 a ratio Rs′ of a number of the dimples each having a diameter of equal to or greater than 10.10% but equal to or less than 10.37%, of the diameter of the golf ball, relative to the total number of the dimples, is equal to or greater than 50%, and   the golf ball meets the following mathematical formula (4):
     Rs′≧− 2.2* So+ 245  (4).
 
   
     
     
         5 . The golf ball according to  claim 4 , wherein the golf ball meets the following mathematical formula (5):
     Rs′≧− 2.2* So+ 252  (5).
   
     
     
         6 . The golf ball according to  claim 1 , wherein a depth of a deepest part of each dimple from a surface of the phantom sphere is equal to or greater than 0.10 mm but equal to or less than 0.65 mm. 
     
     
         7 . The golf ball according to  claim 1 , wherein a total volume of the dimples is equal to or greater than 450 mm 3  but equal to or less than 750 mm 3 . 
     
     
         8 . The golf ball according to  claim 1 , wherein a ratio of a number of the dimples each having a diameter exceeding 10.37% of the diameter of the golf ball, relative to the total number of the dimples, is less than 50%.