Golf ball
AssigneeDunlop Sports Co. Ltd.
InventorsKohei Mimura, Takahiro Sajima, Hyoungchol Kim
Life of this patent
Estimating the term…
Abstract
A golf ball 2 has a large number of dimples 10 on a surface thereof. The contours of the dimples 10 are non-circular. A standard deviation of areas of the dimples 10 is equal to or less than 1.7 mm2. A ratio of a total area of the dimples 10 relative to a surface area of a phantom sphere of the golf ball 2 is equal to or greater than 80%. By comparting lines CS obtained by projecting sides of a regular dodecahedron, which is inscribed in the phantom sphere, onto the phantom sphere, a surface of the phantom sphere can be divided into 12 units Ut each of which meets the following mathematical formula (I): −2≦(Nt/12)−Nu≦2 (I), where Nt represents the total number of the dimples 10 and Nu represents the number of the dimples 10 on one unit.
Claims4
A golf ball having a large number of dimples on a surface thereof, wherein
- a standard deviation of areas of the dimples is equal to or less than 1.7 mm2,
- a ratio of a total area of the dimples relative to a surface area of a phantom sphere of the golf ball is equal to or greater than 80%,
- the dimples include a dimple having a non-circular contour, and
- by comparting lines obtained by projecting sides of a regular dodecahedron, which is inscribed in the phantom sphere, onto the phantom sphere, a surface of the phantom sphere can be divided into 12 units each of which meets the following mathematical formula (I):
- −2≦(Nt/12)−Nu≦2 (I),
- where Nt represents a total number of the dimples and Nu represents a number of the dimples on one unit.
Dependencies are inferred from the claim text.