Golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsToshiyuki Takubo, Takahiro Sajima
Life of this patent
Estimating the term…
Abstract
A golf ball has a large number of exposed portions 22 on a surface thereof. An average value Hav of heights H of these exposed portions 22 is not less than 0.5 μm and not greater than 50 μm. The surface of the golf ball has one or more first zones and one or more second zones. An average value Hav1 of the heights H of the exposed portions 22 on these first zones is higher than an average value Hav2 of the heights H of the exposed portions 22 on these second zones. Preferably, the average value Hav1 and the average value Hav2 satisfy the following mathematical formula. 3≤(Hav1−Hav2)≤50
Claims14
A golf ball comprising a core and a cover positioned outside the core, wherein
- the cover has a plurality of minute projections on a surface thereof,
- each minute projection has an exposed portion that is exposed on a surface of the golf ball,
- the exposed portion of the minute projection has an average diameter Dav that is not less than 5 μm and not greater than 50 μm,
- an average value Hav of heights H of the exposed portions is not less than 0.5 μm and not greater than 50 μm,
- the surface of the golf ball has one or more first zones and one or more second zones, and
- an average value Hav1 of the heights H of the exposed portions in the first zones is higher than an average value Hav2 of the heights H of the exposed portions in the second zones.
A method for producing a golf ball including a core and a cover positioned outside the core, the method comprising the steps of:
- introducing a material into a mold having a plurality of minute recesses on a cavity face thereof;
- and
- forming the cover having exposed portions having a shape that is an inverted shape of the minute recesses, from the material,
- wherein
- the exposed portions have an average diameter Dav that is not less than 5 μm and not greater than 50 μm,
- an average value Hav of heights H of the exposed portions is not less than 0.5 μm and not greater than 50 m,
- a surface of the golf ball has one or more first zones and one or more second zones, and
- an average value Hav1 of the heights H of the exposed portions in the first zones is higher than an average value Hav2 of the heights H of the exposed portions in the second zones.
A method for producing a golf ball including a core and a cover positioned outside the core, the method comprising the steps of:
- introducing a material into a mold having a plurality of minute recesses on a cavity face thereof;
- forming the cover having minute projections having a shape that is an inverted shape of the minute recesses, from the material;
- and
- forming a paint layer on a surface of the cover such that parts of the minute projections are exposed from the paint layer to form exposed portions,
- wherein
- the exposed portions have an average diameter Dav that is not less than 5 μm and not greater than 50 μm,
- an average value Hav of heights H of the exposed portions is not less than 0.5 μm and not greater than 50 μm,
- a surface of the golf ball has one or more first zones and one or more second zones, and
- an average value Hav1 of the heights H of the exposed portions in the first zones is higher than an average value Hav2 of the heights H of the exposed portions in the second zones.
Dependencies are inferred from the claim text.