Patent ID: 7384352
Filing Date: 2008-06-10
Classification: A63B

Abstract:
1. A golf ball which comprises a spherical core and a cover positioned outside of the core, the core having a spherical center and a mid layer positioned outside of the center, wherein the mid layer comprises a polymer composition containing a metal oxide with a three-dimensional shape, a D hardness of the mid layer is 32 or greater and 39 or less, a ratio (C a ratio (C the golf ball having three or more kinds of dimples, each having a different diameter, on the surface thereof, a total number of the dimples is 300 or greater, a ratio Pn of the number of the dimples with a diameter of equal to or greater than 3.40 mm to the total number of the dimples is equal to or greater than 90%, NL and NH, which each represent numbers of kinds of dimples, satisfy formula (I) below, and NL, NHm and NHp, which each represent numbers of kinds of dimples, satisfy formula (II) below: wherein in formula (I), NL represents the number of dimples located in a low latitude region having a latitude that is zero degrees or greater and less than 30 degrees, and having a diameter of equal to or greater than 3.40 mm; and NH represents the number of dimples located in a high latitude region having a latitude that is 30 degrees or greater and 90 degrees or less, and having a diameter of equal to or greater than 3.40 mm; and wherein in formula (II), NL represents the number of dimples located in a low latitude region having a latitude that is zero degrees or greater and less than 30 degrees, and having a diameter of equal to or greater than 3.40 mm; NHm represents the number of dimples located in a middle region having a latitude that is 30 degrees or greater and less than 60 degrees, and having a diameter of equal to or greater than 3.40 mm; and NHp represents the number of dimples located in a polar region having a latitude that is 60 degrees or greater and 90 degrees or less, and having a diameter of equal to or greater than 3.40 mm.