Golf ball and method of manufacture
AssigneeBridgestone Sports Co., Ltd.
InventorHideo Watanabe
Life of this patent
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Abstract
In a golf ball having a core and a cover of one or more layers, letting the core diameter be D (mm), the cover thickness be T (mm) and the core and ball deflections when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf) be 5 (mm) and B (mm), the following conditions are satisfied: (1) 30≥D/T≥24, (2) 3.9≥E/T≥3.0, and (3) 1.18≥E/B≥1.09. This golf ball provides an excellent flight performance and a soft feel at impact when used by golfers whose head speed is not very fast, such as senior golfers and women golfers. The ball also has a high durability to cracking on repeated impact.
Claims8
A golf ball comprising a core and a cover of one or more layer, wherein, letting the core have a diameter D (mm), the cover have a thickness T (mm), and the core and the golf ball have respective deflections E (mm) and B (mm) when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf), conditions (1) to (3) below are satisfied:
- 30 ≥D/T ≥24, (1)
- 3.9 ≥E/T ≥3.0, and (2)
- 1.18 ≥E/B ≥1.09, (3)
- and wherein E in formula (3) is from 4.4 to 6.0 mm and the initial velocity of the ball is from 76.5 to 77.724 m/s, and
- wherein the core has a hardness profile with, expressed in terms of JIS-C hardness, a core center hardness of 58±5, a hardness at a position 5 mm from the core center of 62±5, a hardness at a position 10 mm from the core center of 65±5, a hardness at a position 15 mm from the core center of 70±5, and a hardness on a surface of the core of 77±5.
Dependencies are inferred from the claim text.