Golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsTakahiro Shigemitsu, Hidetaka Inoue
Life of this patent
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Abstract
An object of the present invention is to provide a golf ball showing a low spin rate on driver shots and a high spin rate on approach shots. The present invention provides a golf ball comprising a spherical center, at least two envelope layers covering the spherical center, and a cover covering the envelope layers, wherein an envelope layer (Es1) formed from a material having a lowest material hardness among a center constituent material and envelope layers constituent materials, is disposed in a region located at a distance from 36.0% to 65.0% of a golf ball radius from a center point of the golf ball.
Claims18
A golf ball comprising a spherical center, at least four envelope layers covering the spherical center, and a cover covering the envelope layers,
- wherein an envelope layer (Es1), which is formed from a material having a material hardness (Hs1) that is lowest among the center and other envelope layers, is disposed in a region located at a radial distance of from 36.0% to 65.0% of the golf ball radius from the golf ball center point,
- an envelope layer (Eh1), which is formed from a material having a material hardness (Hh1) that is highest among the center, cover and other envelope layers, is disposed in a region located at a radial distance of from 85.0% to 99.5% of the golf ball radius from the golf ball center point,
- an envelope layer (E11) is disposed between the spherical center and the envelope layer (Es1), and
- a material hardness (H11) of the envelope layer (E11) is higher than the material hardness (Hs1) of the envelope layer (Es1) and smaller than a material hardness (Ho1) of the spherical center.
Dependencies are inferred from the claim text.