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US 2003/0190979 A1Published application
Golf bail
AssigneeSRI Sports Limited
InventorTakahiro Sajima
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AssigneeSRI Sports Limited
InventorTakahiro Sajima
Estimating the term…
Golf ball 1 has a large number of dimples 2 on its surface. A surface area occupation ratio Y of these dimples 2 is equal to or greater than 75%. A ratio R1 of the diameter of the maximum dimple dmax to the diameter D of this golf ball 1 is 11.0% or greater and 18.0% or less. Total number N of the dimples is equal to or less than 320. A ratio R2 of number of dimples 2 having a diameter d accounting for 11.0% or greater and 18.0% or less of the diameter D, occupied in total number N is equal to or greater than 20%. A mean occupation ratio y which is a value calculated by dividing the surface area occupation ratio Y by total number N is equal to or greater than 0.22%. A summation X of the contour length x of the dimples 2 and the surface area occupation ratio Y satisfy the relationship represented by the following formula (I). X≦38.82·Y+1495 (I)
A golf ball comprising a large number of dimples on its surface,
Dependencies are inferred from the claim text.
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Golf balls: surface depressions or protrusions
Surface depressions or protrusions: arrangement or layout of dimples
Surface depressions or protrusions: dimple profile, i.e. cross-sectional view
Surface depressions or protrusions: specified total dimple volume
Term end not estimated
1. Field of the Invention
The present invention relates to golf balls. More particularly, the present invention relates to the improvement of a dimple pattern of a golf ball.
2. Description of the Related Art
FIG. 1 is a plan view illustrating the golf ball according to one embodiment of the present invention;
FIG. 2 is a front view illustrating the golf ball shown in FIG. 1;
FIG. 3 is a schematic enlarged cross-sectional view illustrating a part of the golf ball shown in FIG. 1;
The present invention is hereinafter described in detail with appropriate references to the accompanying drawing according to the preferred embodiments of the present invention.
A golf ball 1 depicted in FIGS. 1 and 2 has a diameter of from 40 mm to 45 mm in general, and in particular, of from 42 mm to 44 mm. In light of the reduction of air resistance in the range to comply with a rule defined by United States Golf Association (USGA), the diameter is preferably 42.67 mm or greater and 42.80 mm or less. Weight of this golf ball 1 is 40 g or greater and 50 g or less, and particularly 44 g or greater and 47 g or less. In light of the elevation of inertia in the range to comply with a rule defined by United States Golf Association, the golf ball 1 preferably has weight of 45.00 g or greater and 45.93 g or less.
This golf ball 1 includes A dimples having a plane shape of circular with a diameter of 5.60 mm, B dimples having a plane shape of circular with a diameter of 5.10 mm, C dimples having a plane shape of circular with a diameter of 4.85 mm, D dimples having a plane shape of circular with a diameter of 4.50 mm, E dimples having a plane shape of circular with a diameter of 4.25 mm, F dimples having a plane shape of circular with a diameter of 3.90 mm, and G dimples having a plane shape of circular with a diameter of 2.75 mm. Number of the A dimple is 18; number of the B dimple is 102; number of the C dimple is 24; number of the D dimple is 18; number of the E dimple is 72; number of the F dimple is 36; and number of the G dimple is 24. Total number N of the dimples of this golf ball 1 is 294.