Title:
ゴルフボール
Document Type and Number:
Japanese Patent JP6690134
Kind Code:
B2
Abstract:
An object of the present invention is to provide a golf ball traveling a great distance on driver shots. The present invention provides a golf ball comprising a spherical core including an inner layer and an outer layer, wherein a difference (H X+1 -H X-1 ) between a hardness (H X+1 ) at a point outwardly away in a radial direction from a boundary between the inner layer and the outer layer of the spherical core by 1 mm and a hardness (H X-1 ) at a point inwardly away in the radial direction from the boundary between the inner layer and the outer layer of the spherical core by 1 mm is 0 or more in Shore C hardness, a surface hardness (H X+Y ) of the spherical core is more than 70 in Shore C hardness, an angle ± of a hardness gradient of the inner layer is 0° or more, a difference (±-²) between the angle ± and an angle ² of a hardness gradient of the outer layer is 0° or more, and the intermediate layer has a highest hardness among the constituent members of the golf ball.
Inventors:
Kosuke Tachibana
Kazuya Kamino
Kazuya Kamino
Application Number:
JP2015090786A
Publication Date:
April 28, 2020
Filing Date:
April 27, 2015
Export Citation:
Assignee:
Sumitomo Rubber Industries, Ltd.
International Classes:
A63B37/00
Domestic Patent References:
| JP2012196521A | ||||
| JP11206920A | ||||
| JP2003190331A | ||||
| JP2011254974A | ||||
| JP2014236968A | ||||
| JP2012010726A |
Attorney, Agent or Firm:
Osamu Futakuchi