US 12,083,391 B2
Golf ball
Sho Goji, Kobe (JP); and Kazuyoshi Shiga, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Filed by Sumitomo Rubber Industries, Ltd., Kobe (JP)
Filed on Feb. 14, 2023, as Appl. No. 18/109,703.
Claims priority of application No. 2022-028072 (JP), filed on Feb. 25, 2022.
Prior Publication US 2023/0293949 A1, Sep. 21, 2023
Int. Cl. A63B 37/06 (2006.01); A63B 37/00 (2006.01); A63B 47/00 (2006.01)
CPC A63B 37/0062 (2013.01) [A63B 37/0045 (2013.01); A63B 37/0064 (2013.01); A63B 37/0075 (2013.01); A63B 37/0076 (2013.01); A63B 37/0096 (2013.01); A63B 47/008 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A golf ball comprising a spherical core having an inner core and an outer core, and a cover positioned outside the spherical core, wherein
A×a is 12,200 or less, and
B×b is 20,400 or more,
where “a” represents an average hardness (Shore C) of a hardness (H2.5) at a point of 2.5 mm from a center of the spherical core and a hardness (H5) at a point of 5 mm from the center of the spherical core,
“b” represents an average hardness (Shore C) of a hardness (H7.5) at a point of 7.5 mm from the center of the spherical core and a hardness (H9) at a point of 9 mm from the center of the spherical core,
“A” represents an impulse difference (kN·μs) between a back spin impulse and a top spin impulse measured using a contact force tester under a condition corresponding to a condition when the golf ball is hit with a driver, and
“B” represents an impulse difference (kN·μs) between a back spin impulse and a top spin impulse measured using a contact force tester under a condition corresponding to a condition when the golf ball is hit with an 8-iron.