GOLF BALL
A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4 . The main body 4 includes a spherical core 8 , a mid layer 10 positioned outside the core 8 , and a cover 12 positioned outside the mid layer 10 . The paint layer 6 includes an inner layer 14 and an outer layer 16 positioned outside the inner layer 14 . When an indentation depth (nm) is measured on a cross-section along a plane passing through a central point of the golf ball 2 when a force of 30 mgf is applied to the cross-section in a direction perpendicular to the cross-section, an indentation depth Di on a cross-section of the inner layer 14 is lower than an indentation depth Do on a cross-section of the outer layer 16.
1 . A golf ball comprising a main body and a paint layer positioned outside the main body, wherein
the paint layer includes an inner layer and an outer layer positioned outside the inner layer,
when an indentation depth (mm) is measured on a cross-section along a plane passing through a central point of the golf ball when a force of 30 mgf is applied to the cross-section in a direction perpendicular to the cross-section, an indentation depth Di on a cross section of the inner layer is lower than an indentation depth Do on a cross-section of the outer layer.
2 . The golf ball according to claim 1 , wherein the indentation depth Di is less than 1000 nm.
3 . The golf ball according to claim 1 , wherein the indentation depth Do is not less than 1000 nm.
4 . The golf ball according to claim 1 , wherein a difference (Do−Di) between the indentation depth Do and the indentation depth Di is not less than 50 nm and not greater than 1800 nm.
5 . The golf ball according to claim 1 , wherein the inner layer has a thickness Ti of not less than 5 μm and not greater than 50 μm, and the outer layer has a thickness To of not less than 5 μm and not greater than 50 μm.
6 . The golf ball according to claim 1 , wherein
the main body includes a core and a cover positioned outside the core,
the paint layer is laminated on the cover, and
the cover has a Shore D hardness Hc of not less than 50 and not greater than 80.
7 . The golf ball according to claim 6 , wherein a difference (Do−Di) between the indentation depth Do and the indentation depth Di is not less than 50 nm and not greater than 1000 nm.
8 . The golf ball according to claim 1 , wherein
the main body includes a core and a cover positioned outside the core,
the paint layer is laminated on the cover, and
the cover has a Shore D hardness Hc of equal to or greater than 20 and less than 50.
9 . The golf ball according to claim 8 , wherein a difference (Do−Di) between the indentation depth Do and the indentation depth Di is not less than 200 nm and not greater than 1800 nm.
10 . The golf ball according to claim 8 , wherein the main body further includes a mid layer between the core and the cover.