Golf ball

Abstract

The present invention provides a golf ball in which a large number of dimples are formed on a ball surface, and when edge angles at points where depths are 10%, 20%, and 30% in a cross-section of one dimple are denoted by ED1, ED2, and ED3, respectively, dimples having a cross-sectional shape satisfying the following condition (1): ED1<ED2>ED3  (1) account for at least 10% of a total number of the dimples.

1 . A golf ball in which a large number of dimples are formed on a ball surface, wherein when edge angles at points where depths are 10%, 20%, and 30% in a cross-section of one dimple are denoted by ED1, ED2, and ED3, respectively, dimples having a cross-sectional shape satisfying the following condition (1): 
       
         
           
             
               
                 
                   
                     
                       ED 
                       ⁢ 
                       1 
                     
                     < 
                     
                       ED 
                       ⁢ 
                       2 
                     
                     > 
                     
                       ED 
                       ⁢ 
                       3 
                     
                   
                 
                 
                   
                     ( 
                     1 
                     ) 
                   
                 
               
             
           
         
       
       account for at least 10% of a total number of the dimples. 
     
     
         2 . The golf ball according to  claim 1 , wherein the dimples satisfying the above condition (1) account for at least 50% of the total number of the dimples. 
     
     
         3 . The golf ball according to  claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 40% is further denoted by ED4, the following condition is satisfied: 
       
         
           
             
               
                 ED 
                 ⁢ 
                 3 
               
               ≥ 
               
                 ED 
                 ⁢ 
                 1 
               
               ≥ 
               
                 ED 
                   
                 4. 
               
             
           
         
       
     
     
         4 . The golf ball according to  claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 50% is further denoted by ED5, the following condition is satisfied: 
       
         
           
             
               
                 ED 
                 ⁢ 
                 
                   1 
                   / 
                   ED 
                 
                 ⁢ 
                 5 
               
               ≥ 
               
                 1.2 
                 . 
               
             
           
         
       
     
     
         5 . The golf ball according to  claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 50% is further denoted by ED5, the following condition is satisfied: 
       
         
           
             
               
                 ED 
                 ⁢ 
                 
                   2 
                   / 
                   ED 
                 
                 ⁢ 
                 5 
               
               ≥ 
               
                 1.2 
                 . 
               
             
           
         
       
     
     
         6 . The golf ball according to  claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 50% is further denoted by ED5, the following condition is satisfied: 
       
         
           
             
               
                 ED 
                 ⁢ 
                 
                   3 
                   / 
                   ED 
                 
                 ⁢ 
                 5 
               
               ≥ 
               
                 1.2 
                 . 
               
             
           
         
       
     
     
         7 . The golf ball according to  claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 60% is further denoted by ED6, the following condition is satisfied: 
       
         
           
             
               
                 ED 
                 ⁢ 
                 
                   2 
                   / 
                   ED 
                 
                 ⁢ 
                 6 
               
               ≥ 
               
                 2. 
                 . 
               
             
           
         
       
     
     
         8 . The golf ball according to  claim 1 , wherein in the dimples satisfying the above condition (1), ED1, ED2, and ED3 are all not more than 90 degrees. 
     
     
         9 . The golf ball according to  claim 1 , wherein in the dimples satisfying the above condition (1), both ED5 and ED6 are not more than 90 degrees. 
     
     
         10 . The golf ball according to  claim 1 , wherein a total volume of the dimples satisfying the above condition (1) is from 300 to 500 mm 3 . 
     
     
         11 . The golf ball according to  claim 1 , wherein number of types of the dimples satisfying the above condition (1) is at least three. 
     
     
         12 . The golf ball according to  claim 1 , wherein number of the dimples satisfying the above condition (1) is from 250 to 500. 
     
     
         13 . The golf ball according to  claim 1 , wherein an occupancy ratio of the dimples satisfying the above condition (1) is 60 to 90%.