Golf ball

Abstract

A golf ball 2 includes a core 4, a mid layer 6, and a cover 8. A Shore C hardness Ms at a surface of a sphere 14 consisting of the core 4 and the mid layer 6 is equal to or greater than a Shore C hardness Cs at a surface of the core 4. The hardness Cs is equal to or greater than a Shore C hardness Bs at a surface of the golf ball 2. A value V1 calculated by the following mathematical formula is 9.15 or more and 10.85 or less.V1=(Cc/Cd)*Cs, where Cc represents an amount of compressive deformation (mm) of the core 4 measured under conditions where an initial load is 98 N and a final load is 1274 N, and Cd represents a diameter (mm) of the core 4.

What is claimed is: 
     
         1 . A golf ball comprising a core, a mid layer positioned outside the core, and a cover positioned outside the mid layer, wherein
 a Shore C hardness Ms at a surface of a sphere consisting of the core and the mid layer is equal to or greater than a Shore C hardness Cs at a surface of the core,   the hardness Cs is equal to or greater than a Shore C hardness Bs at a surface of the golf ball, and   a value V1 calculated by the following mathematical formula is 9.15 or more and 10.85 or less,   
       
         
           
             
               
                 
                   V 
                   ⁢ 
                   1 
                 
                 = 
                 
                   
                     ( 
                     
                       Cc 
                       / 
                       Cd 
                     
                     ) 
                   
                   * 
                   Cs 
                 
               
               , 
             
           
         
       
       where Cc represents an amount of compressive deformation (mm) of the core measured under conditions where an initial load is 98 N and a final load is 1274 N, and Cd represents a diameter (mm) of the core. 
     
     
         2 . The golf ball according to  claim 1 , wherein a value V2 calculated by the following mathematical formula is 253 or more and 355 or less, 
       
         
           
             
               
                 V 
                 ⁢ 
                 2 
               
               = 
               
                 Cs 
                 + 
                 
                   ( 
                   
                     Ms 
                     * 
                     Mt 
                   
                   ) 
                 
                 + 
                 Bs 
               
             
           
         
       
       where Mt represents a thickness (mm) of the mid layer. 
     
     
         3 . The golf ball according to  claim 1 , wherein a value V3 calculated by the following mathematical formula is 0.60 or more and 1.40 or less, 
       
         
           
             
               
                 V 
                 ⁢ 
                 3 
               
               = 
               
                 Cc 
                 / 
                 
                   ( 
                   
                     Mm 
                     * 
                     Mt 
                   
                   ) 
                 
               
             
           
         
       
       where Mm represents a melt flow rate (g/10 min) of the mid layer, and Mt represents a thickness (mm) of the mid layer. 
     
     
         4 . The golf ball according to  claim 1 , wherein a material of the mid layer is a resin composition containing an ionomer resin as a principal component. 
     
     
         5 . The golf ball according to  claim 1 , wherein a material of the cover is a resin composition containing an ionomer resin as a principal component.