US 7,320,651 B2
Golf ball
Takahiro Sajima, Kobe (Japan)
Assigned to SRI Soprts Limited, Kobe (Japan)
Filed on Dec. 29, 2006, as Appl. No. 11/647,411.
Claims priority of application No. 2006-014517 (JP), filed on Jan. 24, 2006.
Prior Publication US 2007/0173354 A1, Jul. 26, 2007
Int. Cl. A63B 37/12 (2006.01)
U.S. Cl. 473—383 4 Claims
OG exemplary drawing
 
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),
NL−NH≧0  (I)
(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)
NL>NHm≧NHp  (II)
(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).