JP6776526B2 - ゴルフボール - Google Patents
ゴルフボール Download PDFInfo
- Publication number
- JP6776526B2 JP6776526B2 JP2015229152A JP2015229152A JP6776526B2 JP 6776526 B2 JP6776526 B2 JP 6776526B2 JP 2015229152 A JP2015229152 A JP 2015229152A JP 2015229152 A JP2015229152 A JP 2015229152A JP 6776526 B2 JP6776526 B2 JP 6776526B2
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- Prior art keywords
- golf ball
- less
- dimples
- mass
- viewpoint
- 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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- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
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- 150000001993 dienes Chemical group 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 150000002019 disulfides Chemical class 0.000 description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
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- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
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- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
- A63B37/0075—Three piece balls, i.e. cover, intermediate layer and core
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- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
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- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
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- 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
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- A63B37/0017—Specified total dimple volume
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- A—HUMAN NECESSITIES
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- A63B37/00—Solid balls; Rigid hollow balls; Marbles
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- A—HUMAN NECESSITIES
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- A63B37/00—Solid balls; Rigid hollow balls; Marbles
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- A—HUMAN NECESSITIES
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- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
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- A—HUMAN NECESSITIES
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- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
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- A—HUMAN NECESSITIES
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Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
(DH ・ Hm) / (Hc ・ Tc) > 80 (1)
((Sb ・ Tc) / (Hc ・ Hm ・Tm)) ・ 1000 > 0.75 (2)
カバーの硬度Hcは、40以下である。このゴルフボールは、その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。
V1 = (DH ・ Hm) / (Hc ・ Tc)
換言すれば、このゴルフボール2は、下記数式(1)を満たす。
(DH ・ Hm) / (Hc ・ Tc) > 80 (1)
本発明者が得た知見によれば、値V1は、ドライバーショットでのスピン速度と相関する。上記数式(1)を満たすゴルフボール2では、ドライバーショットでのスピンが抑制される。このゴルフボール2は、ドライバーショットでの飛行性能に優れる。この観点から、値V1は90以上がより好ましく、100以上が特に好ましい。打球感の観点から、値V1は135以下が好ましい。
V2 = ((Sb ・ Tc) / (Hc ・ Hm ・Tm)) ・ 1000)
換言すれば、このゴルフボール2は、下記数式(2)を満たす。
((Sb ・ Tc) / (Hc ・ Hm ・Tm)) ・ 1000 > 0.75 (2)
本発明者が得た知見によれば、値V2は、ドライバーショットでの打球感と相関する。上記数式(2)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ソフトな打球感が得られる。この観点から、値V2は0.81以上がより好ましく、0.90以上が特に好ましい。飛行性能の観点から、値V2は1.30以下が好ましい。
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」)、29.5質量部のアクリル酸亜鉛、12質量部の酸化亜鉛、適量の硫酸バリウム、0.1質量部の2−ナフタレンチオール、0.3質量部のペンタブロモジフェニルジスルフィド、0.85質量部のジクミルパーオキサイド及び2質量部の安息香酸を混練し、ゴム組成物を得た。このゴム組成物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、150℃で20分間加熱して、直径が39.7mmであるコアを得た。
コア、中間層、カバー及びディンプルの仕様を下記の表6−8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2−6及び比較例1−6のゴルフボールを得た。コアの仕様の詳細が、下記の表1に示されている。中間層の仕様の詳細が、下記の表2に示されている。カバーの仕様の詳細が、下記の表3に示されている。ディンプルの仕様の詳細が、下記の表4及び5に示されている。比較例5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6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「XXIO8」、シャフト硬度:R、ロフト角:10.5°)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、ボール速度、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6−8に示されている。
30名のプレーヤーにドライバー(ダンロップスポーツ社の商品名「XXIO8」、シャフト硬度:R、ロフト角:10.5°)にてゴルフボールを打撃させ、フィーリングを聞き取った。「フィーリングが良好」と答えたゴルファーの数に基づき、下記の格付けを行った。
A:25人以上
B:20−24人
C:15−19人
D:14人以下
この結果が、下記の表6−8に示されている。
4・・・コア
6・・・中間層
8・・・カバー
10・・・ディンプル
10S・・・小ディンプル
10L・・・大ディンプル
12・・・ランド
14・・・仮想球
Claims (10)
- コアと、この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、
上記コアにおける表面と中心点とのショアC硬度の差DH、上記中間層における厚みTm(mm)及びショアD硬度Hm、上記カバーにおける厚みTc(mm)及びショアD硬度Hc、並びに上記ゴルフボールの圧縮変形量Sb(mm)が、下記数式を満たし、
135 > (DH ・ Hm) /(Hc ・ Tc) >80
1.30 > ((Sb ・ Tc) /(Hc ・ Hm ・Tm)) ・ 1000 > 0.75
上記カバーの硬度Hcが40以下であり、
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、
そ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、
その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。 - 上記中間層の硬度Hmが55以上である請求項1に記載のゴルフボール。
- 上記比率PSが0.7%以上である請求項1又は2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3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4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5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6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7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8に記載のゴルフボール。
- 下記数式を満たす請求項1から9のいずれかに記載のゴルフボール。
1.30 > ((Sb ・ Tc) /(Hc ・ Hm ・Tm)) ・ 1000 ≧ 0.81
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