Golf ball
Abstract
The present invention provides a golf ball in which dimples are formed on a ball surface, wherein when edge angles at points where depths are 10%, 20%, and 30% in a cross-section of one dimple are denoted as ED1, ED2, and ED3, respectively, dimples with a cross-sectional shape satisfying the following condition (1):ED1<ED2>ED3(1)account for at least 10% of a total number of the dimples, and further a ratio A1 of a lift coefficient at a Reynolds number of 218,000 and a spin rate of 2,800 rpm to a drag coefficient, a ratio A2 of a lift coefficient at a Reynolds number of 184,000 and a spin rate of 2,900 rpm to a drag coefficient, and a ratio A3 of a lift coefficient at a Reynolds number of 158,000 and a spin rate of 3,100 rpm to a drag coefficient are optimized.
Claims
exact text as granted — not AI-modified1 . A golf ball wherein a large number of dimples are formed on a ball surface, when edge angles at points where depths are 10%, 20%, and 30% in a cross-section of one dimple are denoted as ED1, ED2, and ED3, respectively, dimples with a cross-sectional shape satisfying the following condition (1):
ED
1
<
ED
2
>
ED
3
(
1
)
account for at least 10% of a total number of the dimples, and when a ratio CL1/CD1 of a lift coefficient CL1 at a Reynolds number of 218,000 and a spin rate of 2,800 rpm to a drag coefficient CD1 is denoted by A1, a ratio CL2/CD2 of a lift coefficient CL2 at a Reynolds number of 184,000 and a spin rate of 2,900 rpm to a drag coefficient CD2 is denoted by A2, and a ratio CL3/CD3 of a lift coefficient CL3 at a Reynolds number of 158,000 and a spin rate of 3,100 rpm to a drag coefficient CD3 is denoted by A3, the following two conditions are satisfied:
0.59
≤
A
1
≤
0.655
,
and
(
A
2
+
A
3
)
/
2
≥
0.67
.
2 . The golf ball according to claim 1 , wherein the dimples satisfying the above condition (1) account for at least 50% of the total number of the dimples.
3 . The golf ball according to claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 40% is further denoted by ED4, the following condition is satisfied:
ED
3
≥
ED
1
≥
ED
4.
4 . The golf ball according to claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 50% is further denoted by ED5, the following condition is satisfied:
ED
1
/
ED
5
≥
1.35
.
5 . The golf ball according to claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 50% is further denoted by ED5, the following condition is satisfied:
ED
2
/
ED
5
≥
1.35
.
6 . The golf ball according to claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 50% is further denoted by ED5, the following condition is satisfied:
ED
3
/
ED
5
≥
1.35
.
7 . The golf ball according to claim 1 , wherein in the dimples satisfying the above condition (1), when an edge angle at a point where the depth is 60% is further denoted by ED6, the following condition is satisfied:
ED
2
/
ED
6
≥
2.
.
8 . The golf ball according to claim 1 , wherein in the dimples satisfying the above condition (1), when edge angles at points where the depth is 50% and 60% are denoted by ED5 and ED6, respectively, ED1, ED2, ED3, ED5, and ED6 are all not more than 90 degrees.
9 . The multi-piece solid golf ball according to claim 1 , wherein the value of (A2+A3)/2 is from 0.670 to 0.783.
10 . The multi-piece solid golf ball according to claim 1 , wherein the value of A2 is from 0.635 to 0.750, and the value of A3 is from 0.695 to 0.815.
11 . The golf ball according to claim 1 , wherein the number of types of the dimples satisfying the above condition (1) is at least three.
12 . The golf ball according to claim 1 , wherein the number of the dimples satisfying the above condition (1) is from 250 to 500.
13 . The golf ball according to claim 1 , wherein an occupancy ratio of the dimples satisfying the above condition (1) is from 60 to 90%.
14 . The golf ball according to claim 1 , wherein a total volume of the dimples is from 300 to 500 mm 3 .Join the waitlist — get patent alerts
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