JP2019097667A - ゴルフボール - Google Patents
ゴルフボール Download PDFInfo
- Publication number
- JP2019097667A JP2019097667A JP2017229103A JP2017229103A JP2019097667A JP 2019097667 A JP2019097667 A JP 2019097667A JP 2017229103 A JP2017229103 A JP 2017229103A JP 2017229103 A JP2017229103 A JP 2017229103A JP 2019097667 A JP2019097667 A JP 2019097667A
- Authority
- JP
- Japan
- Prior art keywords
- golf ball
- dimple
- less
- hardness
- thickness
- 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.)
- Granted
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Abstract
Description
15≦ (TH2−THs) ≦ 100
インナーカバーにおける厚みT1(mm)とショアC硬度H1との積TH1、アウターカバーにおける厚みT3(mm)とショアC硬度H3との積TH3、及び積TH2は、下記数式を満たす。
0.25 < ((TH1 + TH3) / 2) / TH2 <0.65
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。全てのディンプルの面積の標準偏差Suは、1.70mm2以下である。全ての近傍ディンプル対の間の距離Lの標準偏差Pdは、0.500mm未満である。
15≦ (TH2−THs) ≦ 100
換言すれば、差(TH2−THs)は15以上100以下である。差(TH2−THs)がこの範囲内であるゴルフボール2は、飛行性能と打球感とに優れる。この観点から、差(TH2−THs)は15以上90以下がより好ましく、16以上85以下が特に好ましい。
0.25 < ((TH1 + TH3) / 2) / TH2 <0.65
換言すれば、インナーカバー6における積TH1とアウターカバー10における積TH3との平均の、メインカバー8における積TH2に対する比は、0.25を超えて0.65未満である。この比が上記範囲内であるゴルフボール2は、飛行性能と打球感とに優れる。この観点から、この比は0.26以上0.63以下がより好ましく、0.27以上0.60以下が特に好ましい。
S= (Dm / 2)2* π
Su = (((15.21 - 14.02)2 * 60 + (14.52- 14.02)2* 158 + (13.85 - 14.02)2* 72
+ (13.20 - 14.02)2* 36 + (7.07 - 14.02)2* 12)) / 338)1/2
= 1.44
(1)これらのディンプル12の中心を結ぶ直線が、他のディンプル12と交差しない。
(2)これらのディンプル12の2つの共通内接線が、それぞれ、いずれのディンプル12とも交差しない。
100質量部のハイシスポリブタジエン(JSR社の商品名「BR−730」)、28.5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、0.5質量部のジフェニルジスルフィド、0.9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Iを得た。このゴム組成物I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18分間加熱して、直径が37.80mmであるコアを得た。所定の質量のコアが得られるように、硫酸バリウムの量を調整した。
ディンプルの仕様を下記の表9及び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2−5及び比較例1−2のゴルフボールを得た。ディンプルの仕様の詳細が、下記の表5−8に示されている。
コア、インナーカバー、メインカバー、アウターカバー及びディンプルの仕様を下記の表11及び12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6−9及び比較例3−8のゴルフボールを得た。コアの組成の詳細が、下記の表1に示されている。インナーカバーの組成の詳細が、下記の表2に示されている。メインカバーの組成の詳細が、下記の表3に示されている。アウターカバーの組成の詳細が、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5−8に示されている。
ゴルフラボラトリー社のスイングマシンに、チタン合金製のヘッドを備えたドライバー(ダンロップスポーツ社の商品名「XXIO 9」、シャフト硬度:R、ロフト角:10.5°)を装着した。このゴルフボールを、ヘッド速度が40m/secである条件で打撃して、打撃直後のボール速度及びスピン速度並びに飛距離を測定した。飛距離は、発射地点から静止地点までの距離である。テスト時は、ほぼ無風であった。12回の測定で得られたデータの平均値が、下記の表9−12に示されている。
4・・・コア
6・・・インナーカバー
8・・・メインカバー
10・・・アウターカバー
12・・・ディンプル
14・・・ランド
16・・・仮想球
18・・・近傍ディンプル対
Claims (11)
- コアと、このコアの外側に位置するインナーカバーと、このインナーカバーの外側に位置するメインカバーと、このメインカバーの外側に位置するアウターカバーとを備えており、
上記メインカバーにおける厚みT2(mm)とショアC硬度H2との積TH2、及び上記コアにおける半径(mm)の5%の値と表面のショアC硬度Hsとの積THsが、下記の数式を満たし、
15≦ (TH2−THs) ≦ 100
上記インナーカバーにおける厚みT1(mm)とショアC硬度H1との積TH1、上記アウターカバーにおける厚みT3(mm)とショアC硬度H3との積TH3、及び上記積TH2が、下記数式を満たし、
0.25 < ((TH1 + TH3) / 2) / TH2 <0.65
その表面に複数のディンプルを有しており、
全てのディンプルの面積の標準偏差Suが1.70mm2以下であり、
全ての近傍ディンプル対の間の距離Lの標準偏差Pdが0.500mm未満であるゴルフボール。 - 上記厚みT2が、上記厚みT1と同じかこれよりも大きく、
かつ、上記厚みT2が、上記厚みT3と同じかこれよりも大きい請求項1に記載のゴルフボール。 - 上記厚みT2が1.00mm以上である請求項1又は2に記載のゴルフボール。
- 上記厚みT1が1.00mm以下であり、かつ上記厚みT3が1.00mm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。
- 上記硬度H2が93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。
- 上記硬度H1が70以下であり、かつ上記硬度H3が70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。
- 上記標準偏差Suが1.50mm2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。
- 上記標準偏差Pdが0.400mm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。
- 上記ゴルフボールの仮想球の表面積に対する、上記ディンプルの面積の合計の比率Soが、78.0%以上である請求項1から8のいずれかに記載のゴルフボール。
- 全てのディンプルの容積の合計が450mm3以上750mm3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。
- 上記ゴルフボールの仮想球の半球のディンプルパターンが、互いに回転対称である3つのユニットからなり、
それぞれのユニットのディンプルパターンが、互いに鏡面対称である2つの小ユニットからなる請求項1から10のいずれかに記載のゴルフボール。
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US6527652B1 (en) * | 1999-07-28 | 2003-03-04 | Bridgestone Sports Co., Ltd. | Solid golf ball |
US10166441B2 (en) * | 2009-03-13 | 2019-01-01 | Acushnet Company | Three-cover-layer golf ball having transparent or plasticized polyamide intermediate layer |
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JPH10295852A (ja) * | 1997-05-01 | 1998-11-10 | Sumitomo Rubber Ind Ltd | フォーピースソリッドゴルフボール |
JP2000153007A (ja) * | 1998-09-18 | 2000-06-06 | Sumitomo Rubber Ind Ltd | マルチピ―スゴルフボ―ル |
US20040132551A1 (en) * | 2003-01-06 | 2004-07-08 | Steven Aoyama | Golf ball with improved flight performance |
US20070281804A1 (en) * | 2006-06-05 | 2007-12-06 | Sri Sports Limited | Golf ball |
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JP2017113041A (ja) * | 2015-12-21 | 2017-06-29 | ダンロップスポーツ株式会社 | ゴルフボール |
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JP2020191936A (ja) * | 2019-05-24 | 2020-12-03 | 株式会社三共 | 遊技機 |
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