US 12,685,905 B2Granted

Golf ball

AssigneeSumitomo Rubber Industries, Ltd.

InventorsTakahiro Sajima, Daijiro Kojima

Life of this patent

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Abstract

A golf ball can include a core, amid layer, and a cover. In the golf ball, a hardness Ho at a central point of the core, a core surface hardness Hs, a hardness H1 at a point to which a distance from the central point of the core can be equal to 25% of a radius of the core, a hardness H2 at a point to which a distance from the central point of the core can be equal to 75% of the radius of the core, a hardness Hm of the mid layer, and a hardness Hc of the cover can satisfy all of the following relational expressions. Ho ≤ H ⁢ 1 ≤ H ⁢ 2 ≤ Hs ( 1 ) Ho < Hs ( 2 ) ( Hs - Ho ) * ( 3 / 2 ) ≤ ( Hm - Hc ) ( 3 ) ( Hs - Hc ) * ( 3 / 2 ) ≤ ( Hm - Hs ) . ( 4 )

Claims15

Dependent claims

A golf ball comprising:

a spherical core,
a mid layer positioned outside the core, and
a cover positioned outside the mid layer,
wherein the golf ball satisfies the following relational expressions (1) to (4):
Ho
≤
H
⁢
1
≤
H
⁢
2
≤
Hs
,
(
1
)
Ho
<
Hs
,
(
2
)
(
Hs
-
Ho
)
*
(
3
/
2
)
≤
(
Hm
-
Hc
)
,
and
(
3
)
(
Hs
-
Hc
)
*
(
3
/
2
)
≤
(
Hm
-
Hs
)
,
(
4
)
wherein
Ho:
Shore-C hardness at a central point of the core,
Hs:
Shore-C hardness at a surface of the core,
H1:
Shore-C hardness at a point to which a distance from the central point of the core is equal to 25% of a radius of the core,
H2:
Shore-C hardness at a point to which a distance from the central point of the core is equal to 75% of the radius of the core,
Hm:
Shore-C hardness of the mid layer,
Hc:
Shore-C hardness of the cover,
wherein the golf ball further satisfies the following relational expression (7):
(
Hm
-
H
⁢
2
)
>
¯
23
,
(
7
)
and
wherein a compressive deformation Dc of the core is 3.80-5.00 mm.

96 more elements

Dependencies are inferred from the claim text.

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Abstract