Golf ball

Abstract

A golf ball 2 has a large number of dimples 10 on a surface thereof. A dimple pattern of each hemisphere of the golf ball 2 includes three units (T1, T2, and T3) that are rotationally symmetrical to each other. A dimple pattern of each unit includes two small units (T1a, T1b) that are mirror-symmetrical to each other. A standard deviation Su of areas of all the dimples 10 is not greater than 1.7 mm2. A standard deviation Pd of distances L between dimples 10 of all neighboring dimple pairs is less than 0.500 mm. A ratio So of a sum of areas of the dimples 10 relative to a surface area of a phantom sphere of the golf ball 2 is not less than 78.0%.

What is claimed is: 
     
         1 . A golf ball having a plurality of dimples on a surface thereof, wherein
 a standard deviation Su of areas of all the dimples is not greater than 1.7 mm 2 , and   a standard deviation Pd of distances L between dimples of all neighboring dimple pairs is less than 0.500 mm.   
     
     
         2 . The golf ball according to  claim 1 , wherein the standard deviation Pd is less than 0.400 mm. 
     
     
         3 . The golf ball according to  claim 1 , wherein
 a dimple pattern of each hemisphere of a phantom sphere of the golf ball includes three units that are rotationally symmetrical to each other, and   a dimple pattern of each unit includes two small units that are mirror-symmetrical to each other.   
     
     
         4 . The golf ball according to  claim 1 , wherein a ratio So of a sum of areas of the dimples relative to a surface area of the phantom sphere is not less than 78.0%. 
     
     
         5 . The golf ball according to  claim 1 , wherein a sum of volumes of all the dimples is not less than 450 mm 3  and not greater than 750 mm 3 . 
     
     
         6 . The golf ball according to  claim 1 , wherein a total number of the dimples is not less than 300 and not greater than 390.