GOLF BALL
A golf ball 2 has a plurality of dimples 12 and a land 14 on a surface thereof. The golf ball 2 further has a large number of minute projections 18 formed on surfaces of the dimples 12 and the land 14 . An average depth Fav of the dimples 12 and an average height Hav of the minute projections 18 satisfy the following mathematical formula (1). Hav<Fav *0.05 (1) An average value Pav of pitches P between the minute projections 18 and other minute projections 18 adjacent to the minute projections 18 is not less than 10 μm and not greater than 2000 μm.
1 . A golf ball having a plurality of dimples and a land, wherein
the golf ball further has a large number of minute projections formed on surfaces of the dimples and/or the land, and
an average depth Fav of the dimples and an average height Hav of the minute projections satisfy the following mathematical formula (1):
Hav<Fav* 0.05 (1).
2 . The golf ball according to claim 1 , wherein an average value Pav of pitches P between the minute projections and other minute projections adjacent to the minute projections is not less than 10 μm and not greater than 2000 μm.
3 . The golf ball according to claim 1 , wherein the golf ball has a plurality of rows in each of which a plurality of minute projections are aligned at equal pitches.
4 . The golf ball according to claim 1 , wherein an average area Sav of the dimples and an average area Qav of bottom surfaces of the minute projections satisfy the following mathematical formula (2):
Qav<Sav* 0.016 (2).
5 . The golf ball according to claim 1 , wherein
the golf ball includes a main body and a paint layer positioned outside the main body, and
the minute projections each have a shape in which a surface shape of the main body is reflected.
6 . The golf ball according to claim 1 , wherein an average value Lay of distances between the minute projections and other minute projections adjacent to the minute projections is not less than 5 μm and not greater than 1500 μm.
7 . The golf ball according to claim 1 , wherein the average height Hav of the minute projections is not less than 0.5 μm and not greater than 25 μm.
8 . The golf ball according to claim 1 , wherein a total number of the minute projections is not less than 500 and not greater than 500000.