Golf ball

Abstract

The present invention provides a golf ball that achieves a satisfactorily long carry distance when hit with a driver and that accurately generates a desirable amount of backspin in an approach shot. The golf ball of the present invention has a spherical main part, a plurality of ribs formed on the surface of the main part, an interlayer that is placed in depressions surrounded by the ribs and has a hardness greater than that of the ribs, an inner cover that covers the interlayer, and an outer cover that covers the inner cover and has a hardness lower than the inner cover.

1 . A golf ball comprising:
 a spherical main part;   a plurality of ribs formed on the surface of the main part;   an interlayer placed in depressions surrounded by the ribs, the interlayer having a hardness greater than that of the ribs;   an inner cover covering the interlayer; and   an outer cover covering the inner cover, the outer cover having a hardness lower than that of the inner cover.   
     
     
         2 . The golf ball according to  claim 1 , wherein the inner cover has a hardness greater than that of the interlayer. 
     
     
         3 . The golf ball according to  claim 1 , wherein the total thickness of the inner cover and the outer cover is not less than 1.9 mm or more. 
     
     
         4 . The golf ball according to  claim 2 , wherein the total thickness of the inner cover and the outer cover is not less than 1.9 mm or more. 
     
     
         5 . The golf ball according to  claim 1 , wherein the inner cover has a Shore D hardness of 55 to 70. 
     
     
         6 . The golf ball according to  claim 1 , wherein the outer cover has a Shore D hardness of 54 to 60.