Golf ball

Abstract

A golf ball can include a core, mid layer, and a cover. The golf ball can satisfy the following mathematical formulas (1) and (2),Fw/Fwn≤0.98Fw/Fwn2/Fp/Fpn≤0.98, wherein Fw represents a maximum vertical force of the golf ball measured under a first condition, Fwn represents a maximum vertical force of a standard ball measured under the first condition, Fp represents a maximum vertical force of the golf ball measured under a second condition, and Fpn represents a maximum vertical force of the standard ball measured under the second condition.

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, the golf ball satisfying the following mathematical formulas (1) and (2), 
 (Fw/Fwn) ≤ 0.98 (1),   (Fw/Fwn) 2  / (Fp/Fpn) ≤ 0.98 (2),   wherein Fw represents a maximum vertical force of the golf ball measured under a first condition, Fwn represents a maximum vertical force of a standard ball measured under the first condition, Fp represents a maximum vertical force of the golf ball measured under a second condition, and Fpn represents a maximum vertical force of the standard ball measured under the second condition.   
     
     
         2 . The golf ball according to  claim 1 , wherein the golf ball satisfies the mathematical formula (3), 
 (Fp/Fpn) ≤ 0.98 (3) .   
     
     
         3 . The golf ball according to  claim 1 , wherein the golf ball satisfies the mathematical formula (4), 
 (Tp/Tpn) ≥ 1.01 (4),   wherein Tp represents a contact time of the golf ball measured under the second condition, and Tpn represents a contact time of the standard ball measured under the second condition.   
     
     
         4 . The golf ball according to  claim 3 , wherein the golf ball satisfies the mathematical formula (5), 
 (Fp/Fpn) / (Tp/Tpn) ≤ 0.98 (5).   
     
     
         5 . The golf ball according to  claim 1 , wherein the golf ball satisfies the mathematical formula (6), 
 (Tw/Twn) ≥ 1.01 (6),   wherein Tw represents a contact time of the golf ball measured under the first condition, and Twn represents a contact time of the standard ball measured under the first condition.   
     
     
         6 . The golf ball according to  claim 5 , wherein the golf ball satisfies the mathematical formula (7), 
 (Fw/Fwn) / (Tw/Twn) ≤ 0.98 (7) .   
     
     
         7 . The golf ball according to  claim 1 , wherein an amount of compressive deformation CD of the golf ball measured under a condition that an initial load is 98 N and a final load is 1275 N is not less than 3.00 mm. 
     
     
         8 . The golf ball according to  claim 1 , wherein a surface hardness H2s (Shore C) of the mid layer is greater than a surface hardness H1s (Shore C) of the core and is greater than a surface hardness H3s (Shore C) of the cover. 
     
     
         9 . The golf ball according to  claim 1 , wherein a difference (H1s-H1o) between a surface hardness H1s (Shore C) and a central hardness H1o (Shore C) of the core is not less than 14. 
     
     
         10 . The golf ball according to  claim 1 , wherein a ratio of a sum (T2+T3) of a thickness T2 of the mid layer and a thickness T3 of the cover to a diameter D1 of the core is not greater than 0.042. 
     
     
         11 . The golf ball according to  claim 1 , wherein a ratio (H2/H3) of a hardness H2 (Shore D) of the mid layer to a hardness H3 (Shore D) of the cover is not less than 1.80. 
     
     
         12 . The golf ball according to  claim 1 , further comprising one or more paint layers positioned outside the cover, wherein 
 an indentation depth of an outermost paint layer when a load is 30 mgf is not less than 300 nm and not greater than 3000 nm.