JP6958256B2 - ゴルフボール - Google Patents
ゴルフボール Download PDFInfo
- Publication number
- JP6958256B2 JP6958256B2 JP2017215366A JP2017215366A JP6958256B2 JP 6958256 B2 JP6958256 B2 JP 6958256B2 JP 2017215366 A JP2017215366 A JP 2017215366A JP 2017215366 A JP2017215366 A JP 2017215366A JP 6958256 B2 JP6958256 B2 JP 6958256B2
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- Prior art keywords
- dimple
- golf ball
- less
- mass
- dimples
- 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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- Compositions Of Macromolecular Compounds (AREA)
Description
図1に示されたゴルフボール2は、球状のコア4と、このコア4の外側に位置するカバー8とを備えている。この実施形態では、カバー8はコア4に直接に接合されている。このゴルフボール2は、いわゆるツーピースボールである。このゴルフボール2は、その表面に複数のディンプル10を有している。ゴルフボール2の表面のうちディンプル10以外の部分は、ランド12である。このゴルフボール2は、カバー8の外側にペイント層及びマーク層を備えているが、これらの層の図示は省略されている。
Hs −Ho ≧ 10
この数式において、Hoはコア4の中心の硬度を表し、Hsはコア4の表面の硬度を表す。上記数式を満たすコア4は、いわゆる外剛内柔構造を有する。このコア4を有するゴルフボール2がドライバーで打撃されたとき、スピンが抑制される。このコア4を有するゴルフボール2がドライバーで打撃されたとき、大きな打ち出し角度が得られる。
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の中心を結ぶ直線が、他のディンプルと交差しない。
(2)これらのディンプルの2つの共通内接線が、それぞれ、いずれのディンプルとも交差しない。
100質量部のハイシスポリブタジエン(JSR社の商品名「BR−730」)、31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40.10mm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5及び6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3及び4に示されている。
カバーの組成を下記の表7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6−8及び比較例3のゴルフボールを得た。カバーの組成の詳細が、下記の表2に示されている。
カバーの厚みを下記の表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9−10及び比較例4のゴルフボールを得た。
100質量部のハイシスポリブタジエン(JSR社の商品名「BR−730」)、31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38.70mm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。
コアの直径及びカバーの厚みを下記の表9に示される通りとした他は実施例11と同様にして、実施例12のゴルフボールを得た。
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、打ち出し角度、スピン速度及び飛距離を測定した。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。20回の測定で得られたデータの平均値が、下記の表5−9に示されている。
4、24・・・コア
8、28・・・カバー
10・・・ディンプル
12・・・ランド
14・・・仮想球
16・・・近傍ディンプル対
26・・・中間層
Claims (9)
- コアと、このコアの外側に位置するカバーとを備えており、
上記カバーのショアD硬度が50以上であり、
上記カバーの厚みが1.00mm以上であり、
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1.7mm2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に記載のゴルフボール。
- 上記標準偏差Suが1.62mm2以下である請求項1又は2に記載のゴルフボール。
- 上記標準偏差Pdが0.458mm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4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5のいずれかに記載のゴルフボール。
- ディンプルの総数が250個以上390個以下である請求項1から6のいずれかに記載のゴルフボール。
- 上記カバーのショアD硬度が53以上である請求項1から7のいずれかに記載のゴルフボール。
- 上記カバーの厚みが1.80mm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。
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US4936587A (en) * | 1972-03-20 | 1990-06-26 | Acushnet Company | Golf ball |
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US4729861A (en) * | 1972-03-20 | 1988-03-08 | Acushnet Company | Method of making golf balls |
JPS6279072A (ja) * | 1985-09-30 | 1987-04-11 | 住友ゴム工業株式会社 | ゴルフボ−ル |
US4830378A (en) * | 1987-01-28 | 1989-05-16 | Wilson Sporting Goods Co. | Golf ball with uniform land configuration |
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JP3656808B2 (ja) * | 1999-03-03 | 2005-06-08 | ブリヂストンスポーツ株式会社 | ソリッドゴルフボール及びその選定方法 |
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US7144338B2 (en) * | 2002-05-29 | 2006-12-05 | Acushnet Company | Golf ball with varying land surfaces |
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US20060199667A1 (en) * | 2005-03-04 | 2006-09-07 | Jones Douglas E | Low-weight two piece golf balls |
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US8905866B2 (en) * | 2011-06-17 | 2014-12-09 | Bridgestone Sports Co., Ltd. | Method for arranging dimples on golf ball surface |
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