JP6690228B2 - ゴルフボール - Google Patents
ゴルフボール Download PDFInfo
- Publication number
- JP6690228B2 JP6690228B2 JP2015251371A JP2015251371A JP6690228B2 JP 6690228 B2 JP6690228 B2 JP 6690228B2 JP 2015251371 A JP2015251371 A JP 2015251371A JP 2015251371 A JP2015251371 A JP 2015251371A JP 6690228 B2 JP6690228 B2 JP 6690228B2
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- Prior art keywords
- golf ball
- less
- dimples
- hardness
- mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0077—Physical properties
- A63B37/0092—Hardness distribution amongst different ball layers
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
- A63B37/002—Specified dimple diameter
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
インナーコアにおける直径D1(mm)、体積V1(mm3)、中心の硬度H1o(ショアC)、境界内硬度H1in(ショアC)、及び硬度H1inと硬度H1oとの差De1;
アウターコアにおける体積V2(mm3)、及び表面硬度H2s(ショアC)と境界外硬度H2out(ショアC)との差De2;
中間層における厚みTm(mm)及び硬度Hm(ショアD);
並びに
カバーにおける厚みTc(mm)及び硬度Hc(ショアD)
は、下記の数式(1)−(4)を満たす。
1.0 < V2 / V1 < 7.0 (1)
De2 − De1 < 0 (2)
600 < (H1o + H1in) ・ (D1 / 2) / 2 < 1000 (3)
620 < Tc ・ Hc ・ Hm / Tm < 900 (4)
このゴルフボールは、表面に複数のディンプルを有する。これらのディンプルは、面積が8.0mm2未満である複数の小ディンプルと、面積が8.0mm2以上である複数の大ディンプルとを含む。ゴルフボールの仮想球の表面積に対する、小ディンプルの面積の合計の比率PSは、2.0%未満である。この仮想球の表面積に対する、大ディンプルの面積の合計の比率PLは、79.0%以上である。大ディンプルの面積(mm2)の統一度Gは、1.15以下である。
2.0 < V2 / V1 < 6.0
700 < (H1o + H1in) ・ (D1 / 2) / 2 < 900
640 < Tc ・ Hc ・ Hm / Tm < 800
Va = (H1o + H1in) ・ (D1 / 2) / 2
換言すれば、インナーコア4は、下記の数式(3)を満たす。
600 < (H1o + H1in) ・ (D1 / 2) / 2 < 1000 (3)
値Vaは、インナーコア4の硬度分布の積分と近似する。値Vaが600を超えるインナーコア4を有するゴルフボール2では、ドライバーショットでのスピン速度が小さい。値Vaが1000未満であるインナーコア4を有するゴルフボール2では、ドライバーショットでのボールの初速が大きい。小さなスピン速度と大きなボール初速とにより、大きな飛距離が達成される。この観点から、ゴルフボール2が下記数式を満たすことがより好ましい。
700 < (H1o + H1in) ・ (D1 / 2) / 2 < 900
換言すれば、値Vaは700を超えて900未満が好ましい。
1.0 < V2 / V1 < 7.0 (1)
換言すれば、比(V2/V1)は1.0を超えて7.0未満である。比(V2/V1)が1.0を超えるゴルフボール2では、ドライバーショットでのボールの初速が大きい。比(V2/V1)が7.0未満であるゴルフボール2では、ドライバーショットでのスピン速度が小さい。大きなボール初速と小さなスピン速度とにより、大きな飛距離が達成される。この観点から、ゴルフボール2が下記数式を満たすことがより好ましい。
2.0 < V2 / V1 < 6.0
ゴルフボール2が下記数式を満たすことが、特に好ましい。
2.5 < V2 / V1 < 5.0
De2 − De1 < 0 (2)
上記数式を満たすゴルフボール2では、ドライバーショットにおいて、大きな初速と小さなスピン速度とが両立される。この観点から、ゴルフボール2が下記数式を満たすことが、より好ましい。
De2 − De1 < −5
ゴルフボール2が下記数式を満たすことが、特に好ましい。
De2 − De1 < −10
(A1)ポリイソシアネート成分と高分子量ポリオール成分とを含むポリウレタン、
(A2)ポリイソシアネート成分と高分子量ポリオール成分と低分子量ポリオールとを含むポリウレタン、
(A3)ポリイソシアネート成分と高分子量ポリオール成分とポリアミン成分とを含むポリウレタン、
及び
(A4)ポリイソシアネート成分と高分子量ポリオール成分と低分子量ポリオール成分とポリアミン成分とを含むポリウレタン
が例示される。
Vb = Tc ・ Hc ・ Hm / Tm
換言すれば、このゴルフボール2は、下記の数式(4)を満たす。
620 < Tc ・ Hc ・ Hm / Tm < 900 (4)
本発明者が得た知見によれば、値Vbが620を超えて900未満であるゴルフボール2では、飛行性能とコントロール性能とが両立される。この観点から、ゴルフボール2が下記数式を満たすことが、より好ましい。
640 < Tc ・ Hc ・ Hm / Tm < 800
S = (Dm / 2)2 ・ π
G = (((15.9 - 14.9)2 * 80 + (15.2 - 14.9)2 * 74 + (14.5 - 14.9)2 * 62
+ (13.9 - 14.9)2 * 96) / 312)1/2
このゴルフボール2の統一度Gは、0.801である。
100質量部のハイシスポリブタジエン(JSR社の商品名「BR−730」)、26.0質量部のアクリル酸亜鉛、5質量部の酸化亜鉛、適量の硫酸バリウム、0.5質量部のジフェニルジスルフィド及び0.7質量部のジクミルパーオキサイドを混練し、ゴム組成物(b)を得た。このゴム組成物(b)を共に半球状キャビティを備えた上型及び下型からなる金型に投入し、170℃で15分間加熱して、直径D1が24mmであるインナーコアを得た。所定のボール質量が得られるよう、硫酸バリウムの量を調整した。
インナーコア、アウターコア、中間層、カバー及びディンプルの仕様を下記の表7−10に示される通りとした他は実施例1と同様にして、実施例2−9及び比較例1−7のゴルフボールを得た。インナーコア及びアウターコアの仕様の詳細が、下記の表1及び2に示されている。中間層の仕様の詳細が、下記の表3に示されている。カバーの仕様の詳細が、下記の表4に示されている。ディンプルの仕様の詳細が、下記の表5及び6に示されている。比較例3に係るゴルフボールのディンプルパターンは、特開2006−20820公報の比較例4に係るゴルフボールのディンプルパターンと同じである。比較例4に係るゴルフボールのディンプルパターンは、特開2005−137692公報の実施例2に係るゴルフボールのディンプルパターンと同じである。
ゴルフラボラトリー社のスイングマシンに、ドライバー(ダンロップスポーツ社の商品名「Z745」、シャフト硬度:S、ロフト角:8.5°)を装着した。ヘッド速度が50m/secである条件でゴルフボールを打撃して、ゴルフボールの初速、スピン速度及び飛距離を測定した。飛距離は、打撃地点とボールが静止した地点との距離である。12回の測定で得られたデータの平均値が、下記の表7−10に示されている。
4・・・インナーコア
6・・・アウターコア
8・・・中間層
10・・・カバー
12・・・ディンプル
14・・・ランド
16・・・仮想球
Claims (11)
- インナーコアと、このインナーコアの外側に位置するアウターコアと、このアウターコアの外側に位置する中間層と、この中間層の外側に位置するカバーとを備えたゴルフボールであって、
上記インナーコアにおける直径D1(mm)、体積V1(mm3)、中心の硬度H1o(ショアC)、境界内硬度H1in(ショアC)、及び上記硬度H1inと上記硬度H1oとの差De1;
上記アウターコアにおける体積V2(mm3)、及び表面硬度H2s(ショアC)と境界外硬度H2out(ショアC)との差De2;
上記中間層における厚みTm(mm)及び硬度Hm(ショアD);
並びに
上記カバーにおける厚みTc(mm)及び硬度Hc(ショアD)
が、下記の数式(1)−(4’)を満たし、
1.0 < V2 / V1 < 7.0 (1)
De2 − De1 < 0 (2)
600 < (H1o + H1in) ・(D1 / 2) / 2 < 1000 (3)
639 ≦ Tc ・ Hc ・ Hm / Tm ≦ 698 (4’)
その表面に複数のディンプルを有しており、
上記ディンプルが、面積が8.0mm2未満である複数の小ディンプルと、面積が8.0mm2以上である複数の大ディンプルとを含んでおり、
上記ゴルフボールの仮想球の表面積に対する、上記小ディンプルの面積の合計の比率PSが、2.0%未満であり、
上記仮想球の表面積に対する、上記大ディンプルの面積の合計の比率PLが、79.0%以上であり、
上記大ディンプルの面積(mm2)の統一度Gが1.15以下であり、
上記ディンプルの総数が250個以上380個以下であるゴルフボール。 - 下記数式を満たす請求項1に記載のゴルフボール。
2.0 < V2 / V1 < 6.0 - 下記数式を満たす請求項1又は2に記載のゴルフボール。
700 < (H1o + H1in) ・(D1 / 2) / 2 < 900 - 下記数式を満たす請求項1から3のいずれかに記載のゴルフボール。
640 < Tc ・ Hc ・ Hm / Tm < 800 - 上記比率PSが0.7%以上である請求項1から4のいずれかに記載のゴルフボール。
- 上記小ディンプルの数NSが6以上20以下である請求項1から5のいずれかに記載のゴルフボール。
- 上記小ディンプルの数NSの、上記ディンプルの総数Nに対する比(NS/N)が、0.01以上0.07以下である請求項1から6のいずれかに記載のゴルフボール。
- それぞれのディンプルの最深部の、上記仮想球の表面からの深さが、0.10mm以上0.65mm以下である請求項1から7のいずれかに記載のゴルフボール。
- 上記ディンプルの総容積が450mm3以上750mm3以下である請求項1から8のいずれかに記載のゴルフボール。
- 上記比率PLが79.5%以上であり、上記統一度Gが1.10以下である請求項1から9のいずれかに記載のゴルフボール。
- 上記比率PLが80.0%以上であり、上記統一度Gが1.05以下である請求項10に記載のゴルフボール。
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