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 |
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).
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