Dimple patterns for golf balls
Golf balls having a dimple pattern arranged in a tetrahedral layout are disclosed. The dimple pattern has four substantially identical dimple sections, where each dimple section is defined by a spherical triangle. The dimples in each of the four dimple sections have at least three different dimple diameters including a minimum dimple diameter, a maximum dimple diameter, and at least one additional dimple diameter. The resulting dimple pattern has a surface coverage of about 70 percent or less. The reduced surface coverage helps to reduce the flight of the golf balls.
1. A golf ball having a substantially spherical surface, comprising:
a dimple pattern disposed thereon, wherein the dimple pattern consists of four substantially identical dimple sections and three dimple-free great circles, wherein each dimple section is defined by a spherical triangle,
wherein each of the four substantially identical dimple sections comprises a plurality of dimples having at least three different dimple diameters including a minimum dimple diameter, a maximum dimple diameter, and at least one additional dimple diameter, and
wherein the plurality of dimples in the four substantially identical dimple sections covers about 70 percent or less of the substantially spherical surface.
2. The golf ball of claim 1 , wherein the minimum difference in diameter between any two dimples within each dimple section is about 0.030 inches or more.
3. The golf ball of claim 2 , wherein each of the at least three different dimple diameters range from about 0.030 inches to about 0.200 inches.
4. The golf ball of claim 1 , wherein the pattern is rotationally symmetric about the center of each substantially identical dimple section.
5. The golf ball of claim 1 , wherein the dimples each have a corresponding edge angle and the average of all the edge angles (θ μ ) is related to the surface coverage according to equation (III):
8
8
.
8
(
SC
)
2
-
116.9
(
SC
)
+
47.7
≤
θ
μ
≤
170.0
(
SC
)
2
-
242.5
(
SC
)
+
1
0
6.6
,
(
III
)
where SC is the surface coverage.
6. The golf ball of claim 1 , wherein each substantially identical dimple section comprises at least one shared dimple, the shared dimple having a centroid that intersects an edge of the dimple section.
7. A golf ball having a substantially spherical surface, comprising:
a dimple pattern disposed thereon, wherein the dimple pattern consists of four substantially identical dimple sections and three dimple-free great circles, wherein each dimple section is defined by a spherical triangle having three vertices,
wherein each of the four substantially identical dimple sections comprises a plurality of dimples having a corresponding dimple diameter and a corresponding edge angle,
wherein the dimples in each of the four substantially identical dimple sections comprise:
(i) at least three different dimple diameters including a minimum dimple diameter, a maximum dimple diameter, and at least one additional dimple diameter, wherein each of the at least three different dimple diameters range from about 0.030 inches to about 0.200 inches, and
(ii) substantially identical edge angles, and
wherein the plurality of dimples in the four substantially identical dimple sections covers about 60 percent or less of the substantially spherical surface.
8. The golf ball of claim 7 , wherein each substantially identical dimple section comprises at least one shared dimple, the shared dimple having a centroid that intersects an edge of the dimple section.
9. The golf ball of claim 7 , wherein a dimple is located at each of the three vertices of the dimple section.
10. The golf ball of claim 7 , wherein the average of all the edge angles (θ μ ) is related to the surface coverage according to equation (III):
8
8
.
8
(
SC
)
2
-
116.9
(
SC
)
+
47.7
≤
θ
μ
≤
170.0
(
SC
)
2
-
242.5
(
SC
)
+
1
0
6.6
,
(
III
)
where SC is the surface coverage.
11. The golf ball of claim 7 , wherein the maximum difference in diameter between any two dimples within each dimple section is about 0.045 inches or less.
12. The golf ball of claim 7 , wherein the pattern has three-way rotational symmetry about the center of each substantially identical dimple section.
13. A golf ball having a substantially spherical surface, comprising:
a dimple pattern disposed thereon, wherein the dimple pattern consists of four substantially identical dimple sections and three dimple-free great circles, wherein each dimple section is defined by a spherical triangle,
wherein the dimples in each of the four substantially identical dimple sections comprises a plurality of dimples having a corresponding dimple diameter and a corresponding edge angle,
wherein the dimples in each of the four substantially identical dimple sections comprise four or more different dimple diameters including a minimum dimple diameter, a maximum dimple diameter, and at least two additional dimple diameters, wherein each of the four or more different dimple diameters range from about 0.050 inches to about 0.180 inches and differ by more than 0.005 inches,
wherein the plurality of dimples in the four substantially identical dimple sections covers about 50 percent or less of the substantially spherical surface.
14. The golf ball of claim 13 , wherein the dimples in each of the four substantially identical dimple sections comprise substantially identical edge angles.
15. The golf ball of claim 13 , wherein the average of all the edge angles (θ μ ) is related to the surface coverage according to equation (III):
8
8
.
8
(
S
C
)
2
-
1
1
6
.
9
(
S
C
)
+
4
7
.
7
≤
θ
μ
≤
1
7
0
.
0
(
S
C
)
2
-
2
4
2
.
5
(
S
C
)
+
1
0
6.6
,
(
III
)
where SC is the surface coverage.
16. The golf ball of claim 13 , wherein the dimples are arranged entirely within each of the four substantially identical dimple sections.
17. The golf ball of claim 13 , wherein each substantially identical dimple section comprises at least one shared dimple, the shared dimple having a centroid that intersects an edge of the dimple section.
18. The golf ball of claim 13 , wherein the dimples cover about 30 percent or less of the substantially spherical surface.
19. The golf ball of claim 13 , wherein the pattern has three-way rotational symmetry about the center of each substantially identical dimple section.