Patent ID: 7278930
Filing Date: 2007-10-09
Classification: A63B

Abstract:
1. A golf ball which comprises a spherical core, a mid layer positioned outside of the core and a cover positioned outside of the mid layer, said cover having a thickness Tc of equal to or less than 0.6 mm, said cover having a hardness Hc as measured with a Shore D type hardness scale of equal to or less than 54, said cover having a volume V of equal to or less than 3.0 cm product obtained by multiplying the thickness Tc (mm) the hardness Hc and the volume V (cm three or more kinds of dimples, each having a different diameter, being provided on the surface of the cover, occupation ratio of total area of the dimples in the surface area of a phantom sphere of the golf ball being equal to or greater than 75%, ratio (Dx/Dn), which is a ratio of a mean diameter of the dimples ranking in the top 10% Dx to a mean diameter of the dimples ranking in the bottom 10% Dn when all the dimples are arranged in decreasing order of the diameter being equal to or greater than 1.30, and standard deviation η of the diameter of all the dimples being equal to or less than 0.40.