Patent ID: 7320651
Filing Date: 2008-01-22
Classification: A63B

Abstract:
1. A golf ball which comprises three or more kinds of dimples, each having a different diameter, on the surface thereof, a total number of the dimples being 300 or more, a ratio Pn of a number of the dimples with a diameter of equal to or greater than 3.40 mm to the total number of the dimples being equal to or greater than 90%, NL and NH, which represent a number of kinds of the dimples, meeting the following formula (I), NL, NHm and NHp, which represent a number of kinds of the dimples, meeting the following formula (II), (In this formula (I), NL represents a number of kinds of the dimples being located in a low latitude region whose latitude is 0 degree or greater and less than 30 degrees, and having a diameter of equal to or greater than 3.40 mm and NH represents a number of kinds of the dimples being located in a high latitude region whose latitude is 30 degrees or greater and 90 degrees or less, and having a diameter of equal to or greater than 3.40 mm) (In this formula (II), NL represents a number of kinds of the dimples being located in the low latitude region whose latitude is 0 degree or greater and less than 30 degrees, and having a diameter of equal to or greater than 3.40 mm; NHm represents a number of kinds of the dimples being located in a middle region whose latitude 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 a number of kinds of the dimples being located in a polar region whose latitude is 60 degrees or greater and 90 degrees or less, and having a diameter of equal to or greater than 3.40 mm).