Golf ball

Abstract

A golf ball has three kinds of dimples A to C on a surface. The A, B and C dimples are circular and have different diameters from each other. In each of the A, B and C dimples, a ratio of the number of dimples to the total number of dimples is 5% or more. The C dimple has a minimum diameter. Moreover, the C dimple also has a maximum depth. In the C dimple, a value of K calculated by the following equation (I) is 0.03 or more: K=de−Di× 0.04   (I) (wherein Di represents a diameter of the specific circular dimple kind and de represents a mean depth of the specific circular dimple kind).

What is claimed is:  
     
         1 . A golf ball comprising, on a surface thereof, a large number of dimples including plural kinds of circular dimples having different diameters from each other, 
 wherein when kinds of circular dimples having a ratio of 5% or more to the total number of dimples is set to be specific circular dimple kinds, there are two or more specific circular dimple kinds, and    when a kind having a minimum diameter in the specific circular dimple kinds is set to be a minimum circular dimple kind, a specific circular dimple kind having a maximum mean depth in all the specific circular dimple kinds is set to be a minimum circular dimple kind.    
     
     
         2 . The golf ball according to  claim 1 , wherein a ratio of the number of dimples of the minimum circular dimple kind to the total number of dimples is 10% or more.  
     
     
         3 . The golf ball according to  claim 1 , wherein a value of K calculated by an equation (I) in the minimum circular dimple kind is 0.03 or more:  
         K=de−Di× 0.04   (I)  
       (wherein Di represents a diameter of the specific circular dimple kind and de represents a mean depth of the specific circular dimple kind).  
     
     
         4 . The golf ball according to  claim 3 , wherein the value of K calculated by the equation (I) in the specific circular dimple kinds excluding the minimum circular dimple kind is −0.02 to 0.02.  
     
     
         5 . The golf ball according to  claim 1 , wherein there are three or more specific circular dimple kinds.  
     
     
         6 . The golf ball according to  claim 1 , wherein a ratio of a total dimple area to a surface area of a virtual sphere of the ball is 70% to 90% and a total dimple volume is 250 mm 3  to 350 mm 3 .