Golf ball
AssigneeDunlop Sports Co. Ltd.
InventorsKazuhiko ISOGAWA, Kosuke TACHIBANA
Life of this patent
Estimating the term…
Abstract
A golf ball 2 includes a core 4, a first mid layer 10, a second mid layer 12, a third mid layer 14, and a cover 8. A volume Vinm and a Shore D hardness Hinm of the first mid layer, a volume Vm and a Shore D hardness Hm of the second mid layer, a volume Voum and a Shore D hardness Houm of the third mid layer, a volume Vc and a Shore D hardness Hc of the cover, and a volume V of an entirety of the ball meet: (a) Hinm<Hm>Houm>Hc, (b) Vinm<Vm>Voum>Vc, (c) Hm−Hc>25, (d) (Vinm+Vm+Voum+Vc)/V<0.40, (e) Vm/Vc>1.50, and (f) (Vm*Hm)/(Vc*Hc)>3.0.
Claims8
A golf ball comprising a core, amid layer positioned outside the core, and a cover positioned outside the mid layer, wherein
- the mid layer includes a first mid layer, a second mid layer positioned outside the first mid layer, and a third mid layer positioned outside the second mid layer, and
- when:
- a volume (mm3) of the first mid layer is defined as Vinm;
- a Shore D hardness of the first mid layer is defined as Hinm;
- a volume (mm3) of the second mid layer is defined as Vm;
- a Shore D hardness of the second mid layer is defined as Hm;
- a volume (mm3) of the third mid layer is defined as Voum;
- a Shore D hardness of the third mid layer is defined as Houm;
- a volume (mm3) of the cover is defined as Vc;
- a Shore D hardness of the cover is defined as Hc;
- and
- a volume of an entirety of the golf ball is defined as V,
- the golf ball meets the following relational expressions (a) to (f):
- Hinm<Hm>Houm>Hc, (a)
- Vinm<Vm>Voum>Vc, (b)
- Hm−Hc>25, (c)
- (Vinm+Vm+Voum+Vc)/V<0.40, (d)
- Vm/Vc>1.50, and (e)
- (Vm*Hm)/(Vc*Hc)>3.0. (f)
Dependencies are inferred from the claim text.