US 11,724,161 B2
Golf ball
Toshiyuki Takubo, Hyogo (JP); and Takahiro Sajima, Hyogo (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed on Aug. 6, 2021, as Appl. No. 17/395,558.
Claims priority of application No. 2020-142703 (JP), filed on Aug. 26, 2020.
Prior Publication US 2022/0062714 A1, Mar. 3, 2022
Int. Cl. A63B 37/06 (2006.01); A63B 37/00 (2006.01)
CPC A63B 37/00373 (2020.08) [A63B 37/0043 (2013.01); A63B 37/0075 (2013.01); A63B 37/00495 (2020.08)] 10 Claims
OG exemplary drawing
 
1. A golf ball comprising a core and a cover positioned outside the core, wherein
an n-layer (n is a natural number) partial mid layer is provided between the core and the cover and has a hardness equal to a hardness of the cover,
an area of the core in a region where the cover is laminated thereon is not less than 5.0% and not greater than 95.0% of a surface area of a phantom sphere having a radius equal to an average value of a distance from a central point of the core to a surface of the core, and
in an outer surface of the golf ball, a color difference ΔE1 based on a CIELAB color system between a region C where the cover is directly laminated on the core and a region M where the cover is laminated on the partial mid layer is not less than 20.0.