JP2008036155A - Golf club head - Google Patents

Golf club head Download PDF

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JP2008036155A
JP2008036155A JP2006214852A JP2006214852A JP2008036155A JP 2008036155 A JP2008036155 A JP 2008036155A JP 2006214852 A JP2006214852 A JP 2006214852A JP 2006214852 A JP2006214852 A JP 2006214852A JP 2008036155 A JP2008036155 A JP 2008036155A
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groove
width
golf club
grooves
area ratio
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JP5226196B2 (en
JP2008036155A5 (en
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Ko Saka
航 坂
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Bridgestone Sports Co Ltd
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Bridgestone Sports Co Ltd
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Priority to JP2006214852A priority Critical patent/JP5226196B2/en
Priority to US11/566,407 priority patent/US20080032814A1/en
Priority to GB0709616A priority patent/GB2440799A/en
Priority to CNA2007101059318A priority patent/CN101121067A/en
Priority to KR1020070078411A priority patent/KR101335089B1/en
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Publication of JP2008036155A5 publication Critical patent/JP2008036155A5/ja
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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
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0445—Details of grooves or the like on the impact surface
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/047—Heads iron-type
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0466—Heads wood-type

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the spin amount of a ball from being substantially reduced in the case of shooting when it is raining or from a rough while preventing the ball from being damaged. <P>SOLUTION: In a golf club head whose club face has a plurality of grooves, the fringes of the grooves is formed with roundness of a radius of 0.2 mm or less, the width W (mm) of the grooves in the case of measurement including the roundness, width Ws (mm) between the adjacent grooves, width Wr (mm) of the grooves in the case of measurement by a 30 degree measuring method, and the crosssectional area S (mm<SP>2</SP>) of the grooves satisfy W/Ws×100≥35(%) and S/(Wr×0.5)×100≥70(%). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明はゴルフクラブヘッドに関し、特に、フェース面に形成される溝に関するものである。   The present invention relates to a golf club head, and more particularly to a groove formed on a face surface.

ゴルフクラブのフェース面には、マーキングライン、スコアライン或いはフェースライン溝と呼ばれる溝が複数形成されている。この溝はボールのスピン量に影響する。アイアン型のゴルフクラブヘッド、とりわけウェッジの場合には、ボールのスピン量が増大するように、この溝が形成されることが望ましい。   A plurality of grooves called marking lines, score lines, or face line grooves are formed on the face surface of the golf club. This groove affects the spin rate of the ball. In the case of an iron-type golf club head, particularly a wedge, it is desirable that the groove be formed so that the spin amount of the ball is increased.

特許文献１には溝の断面形状をＶ字型或いは台形型としたゴルフクラブが開示されている。特許文献２及び３には溝の縁（溝の側面とフェース面との境界部分）に丸みをつけたゴルフクラブヘッドが開示されている。この丸みはボールが傷つくこと（ささくれ等）を防止する効果がある。特許文献４及び５には溝の側面を単一の面とせずに、角度が異なる２つの面から構成したゴルフクラブヘッドが開示されている。特許文献６にはフェース面に対する溝の面積比率をクラブの番手に応じて異なるように設定したアイアンゴルフクラブセットが開示されている。なお、公式競技用のゴルフクラブヘッドで溝の幅や深さ、及び、溝間のピッチにルール上の制約があり、公式競技での用途を考慮した場合には、そのようなルールを満たす範囲での工夫が必要である。   Patent Document 1 discloses a golf club having a groove having a V-shaped or trapezoidal cross-sectional shape. Patent Documents 2 and 3 disclose golf club heads in which the edge of the groove (boundary portion between the side surface of the groove and the face surface) is rounded. This roundness has an effect of preventing the ball from being damaged (such as crushing). Patent Documents 4 and 5 disclose golf club heads constituted by two surfaces having different angles without making the side surface of the groove a single surface. Patent Document 6 discloses an iron golf club set in which the area ratio of the groove to the face surface is set differently depending on the club number. In addition, there are restrictions on the rules for the width and depth of the grooves and the pitch between the grooves in golf club heads for official competitions. Ingenuity is necessary.

特開平９−１９９７４号公報Japanese Patent Laid-Open No. 9-19974 特開平９−７０４５７号公報JP-A-9-70457 特開平１０−１７９８２４号公報JP-A-10-179824 特開２００３−９３５６０号公報JP 2003-93560 A 特開２００５−２８７５３４号公報JP 2005-287534 A 特許第３４６３７７９号公報Japanese Patent No. 3463379

ここで、雨天時やラフからのショットの場合には晴天時やフェアウェイからのショットの場合と比べると、ボールのスピン量が低減する傾向にある。ボールのスピン量の低減を抑制するための方策としては溝の縁の角度を小さくすることが挙げられる。しかし、溝の縁の角度を小さくするとボールに傷がつきやすくなる。特許文献２及び３に開示されているゴルフクラブヘッドのように溝の縁に丸みを付けることはボールに傷がつくことを低減できるが、ボールのスピン量も低減する。   Here, in the case of a rainy day or a shot from the rough, the amount of spin of the ball tends to be reduced as compared to the case of a sunny day or a shot from the fairway. As a measure for suppressing the reduction of the spin amount of the ball, the angle of the groove edge can be reduced. However, if the angle of the groove edge is reduced, the ball is easily damaged. Rounding the edge of the groove as in the golf club heads disclosed in Patent Documents 2 and 3 can reduce damage to the ball, but also reduces the spin amount of the ball.

本発明は、上述した従来の問題点を解決するためになされたものである。   The present invention has been made to solve the above-described conventional problems.

本発明によれば、フェース面に複数の溝が形成されたゴルフクラブヘッドにおいて、前記溝の縁に半径０．２ｍｍ以下の丸みが形成され、前記丸みを含めて測定した場合の前記溝の幅Ｗ（ｍｍ）、隣接する前記溝間の幅Ｗｓ（ｍｍ）、３０度測定法により測定した場合の前記溝の幅Ｗｒ（ｍｍ）、及び、前記溝の断面積Ｓ（ｍｍ2）が、Ｗ／Ｗｓ×１００≧３５（％）、Ｓ／（Ｗｒ×０．５）×１００≧７０（％）であることを特徴とするゴルフクラブヘッドが提供される。 According to the present invention, in a golf club head in which a plurality of grooves are formed on the face surface, a roundness having a radius of 0.2 mm or less is formed at the edge of the groove, and the width of the groove when measured including the roundness. W (mm), width Ws (mm) between adjacent grooves, width Wr (mm) of the groove when measured by a 30-degree measurement method, and sectional area S (mm 2 ) of the groove are W There is provided a golf club head characterized in that / Ws × 100 ≧ 35 (%) and S / (Wr × 0.5) × 100 ≧ 70 (%).

このゴルフクラブヘッドでは、前記溝の縁に半径０．２ｍｍ以下の丸みが形成されることで、ボールに傷がつくことを低減する。一方、前記フェース面における前記溝の面積比率の指標となる上記の”Ｗ／Ｗｓ×１００”と、前記溝の容積の大きさの指標となる上記の”Ｓ／（Ｗｒ×０．５）×１００”と、を上記の数値に設定することで、前記溝の面積比率と容積の大きさとの兼ね合いにより、雨天時やラフからのショットの場合にボールのスピン量が大きく低減することを防止できる。   In this golf club head, a roundness having a radius of 0.2 mm or less is formed at the edge of the groove, thereby reducing damage to the ball. On the other hand, the above-mentioned “W / Ws × 100” that is an index of the area ratio of the groove on the face surface and the above-mentioned “S / (Wr × 0.5) × that is an index of the volume of the groove. By setting 100 ”to the above numerical value, it is possible to prevent the amount of spin of the ball from being greatly reduced in the case of rain or a shot from the rough due to the balance between the area ratio of the groove and the size of the volume. .

以上述べた通り、本発明によれば、ボールに傷がつくことを防止しながら、雨天時やラフからのショットの場合にボールのスピン量が大きく低減することを防止することができる。   As described above, according to the present invention, it is possible to prevent the amount of spin of the ball from being greatly reduced in the case of rain or a shot from the rough while preventing the ball from being damaged.

図１（Ａ）は本発明の一実施形態に係るゴルフクラブヘッド１の外観図である。同図の例はアイアン型のゴルフクラブヘッドに本発明を適用した例を示す。本発明はボールのスピン量が多いことが要求されるゴルフクラブヘッドに好適であり、特にサンドウェッジ、ピッチングウェッジ、アプローチウェッジ等のウェッジに好適である。しかし、本発明はウッド型やユーティリティー型のゴルフクラブヘッドにも適用できる。   FIG. 1A is an external view of a golf club head 1 according to an embodiment of the present invention. The example in the figure shows an example in which the present invention is applied to an iron type golf club head. The present invention is suitable for a golf club head that requires a large amount of spin of the ball, and particularly suitable for wedges such as a sand wedge, a pitching wedge, and an approach wedge. However, the present invention can also be applied to wood type or utility type golf club heads.

ゴルフクラブヘッド１は、そのフェース面１０に複数の溝２０が形成されている。本実施形態の場合、各々の溝２０はトウ−ヒール方向に延在した直線状の溝であり、各々の溝２０の配設間隔（ピッチ）は等間隔（等ピッチ）である。図１（Ｂ）は溝２０の、その長手方向（トウ−ヒール方向）に直交する方向の断面図であり、隣接する２つの溝２０を示している。本実施形態において、溝２０の断面形状は、その長手方向の両端部を除き、同じである。また、各々の溝２０の断面形状は同じである。   The golf club head 1 has a plurality of grooves 20 formed on the face surface 10 thereof. In the present embodiment, each groove 20 is a linear groove extending in the toe-heel direction, and the arrangement interval (pitch) of each groove 20 is equal (equal pitch). FIG. 1B is a cross-sectional view of the groove 20 in a direction orthogonal to the longitudinal direction (toe-heel direction), and shows two adjacent grooves 20. In the present embodiment, the cross-sectional shape of the groove 20 is the same except for both ends in the longitudinal direction. Moreover, the cross-sectional shape of each groove | channel 20 is the same.

溝２０は一対の側面２１及び２２と、底面２３とにより形成されており、断面形状は台形である。本実施形態の場合、溝２０の断面形状はその中心線ＣＬについて対称である。溝２０の一対の側面２１及び２２は、それぞれ、上端がフェース面１０に連続し、下端が底面２３に連続している平坦な面（断面が直線）である。角度θは側面２１と側面２２とがなす角度を意味する。底面２３はフェース面１０と平行である。本実施形態では溝２０の断面形状が台形であるが、長方形、正方形、三角形でもよい。   The groove 20 is formed by a pair of side surfaces 21 and 22 and a bottom surface 23, and the cross-sectional shape is a trapezoid. In the case of this embodiment, the cross-sectional shape of the groove 20 is symmetric with respect to the center line CL. Each of the pair of side surfaces 21 and 22 of the groove 20 is a flat surface (the cross section is a straight line) whose upper end is continuous with the face surface 10 and whose lower end is continuous with the bottom surface 23. The angle θ means an angle formed between the side surface 21 and the side surface 22. The bottom surface 23 is parallel to the face surface 10. In this embodiment, the cross-sectional shape of the groove 20 is a trapezoid, but may be a rectangle, a square, or a triangle.

溝２０の縁２４には丸みが付けられている。縁２４の丸みの半径は０．２ｍｍ以下である。このような丸みはボールが傷つくこと（ささくれ等）を防止する効果がある。丸みの半径は、０．０５（ｍｍ）以上０．１（ｍｍ）以下であることが好ましい。   The edge 24 of the groove 20 is rounded. The radius of roundness of the edge 24 is 0.2 mm or less. Such roundness has an effect of preventing the ball from being damaged (such as crushing). The radius of roundness is preferably 0.05 (mm) or more and 0.1 (mm) or less.

各溝２０は底面幅Ｗｂ、深さＤ及び幅Ｗ、を有する。また、隣接する溝２０間には幅Ｗｓが設定されている。底面幅Ｗｂは底面２３の両端間の距離を意味する。また、深さＤはフェース面１０から底面２３までの距離を意味する。幅Ｗは溝２０の長手方向に直交する方向の幅である。幅Ｗは図２（Ａ）に示すように溝２０の縁２４の丸み（半径ｒ）を含めて測定した場合の幅を意味し、丸みが始まる点（同図の破線位置）から幅Ｗを測定するものとする。また、幅Ｗｓは隣接する２つの溝２０の丸みが始まる点（同図の破線位置）間の距離を意味する。   Each groove 20 has a bottom surface width Wb, a depth D, and a width W. A width Ws is set between the adjacent grooves 20. The bottom surface width Wb means a distance between both ends of the bottom surface 23. The depth D means the distance from the face surface 10 to the bottom surface 23. The width W is a width in a direction orthogonal to the longitudinal direction of the groove 20. The width W means the width when measured including the roundness (radius r) of the edge 24 of the groove 20 as shown in FIG. 2A, and the width W is determined from the point where the roundness starts (the position of the broken line in the figure). Shall be measured. Further, the width Ws means a distance between points at which rounding of two adjacent grooves 20 starts (a broken line position in the figure).

本書において、”丸みを含めて測定した場合の溝の幅”というときは上記の測定方法による幅Ｗを意味し、競技用ゴルフクラブヘッドの溝の幅の測定方法である、いわゆる３０度測定方法（Ｒ＆Ａ規則内規「３０度測定法」）による幅とは区別される。３０度測定法とは図２（Ｃ）に示すようにフェース面１０に対して３０度の傾きを持つ仮想線Ｌが溝２０の側面２１及び２２と接する点間を溝２０の幅（Ｗｒ）として測定するものである。以下、この３０度測定法で測定した場合の幅をルール上の幅と言う。本実施形態のように溝２０の縁２４に丸みを付けた場合は、溝２０の幅Ｗはルール上の幅Ｗｒと異なる場合がある。なお、溝２０の縁に丸みをつけない場合には、溝２０の幅Ｗとルール上の幅Ｗｒとは一致する。   In this document, “groove width when measured including roundness” means the width W by the above-described measurement method, and is a so-called 30-degree measurement method, which is a method for measuring the groove width of a golf club head for competition. It is distinguished from the width by (R & A rule internal rule “30 degree measurement method”). As shown in FIG. 2C, the 30-degree measurement method is the width (Wr) of the groove 20 between the points where the virtual line L having an inclination of 30 degrees with respect to the face surface 10 contacts the side surfaces 21 and 22 of the groove 20. Is to be measured. Hereinafter, the width when measured by this 30-degree measuring method is referred to as the width on the rule. When the edge 24 of the groove 20 is rounded as in the present embodiment, the width W of the groove 20 may be different from the ruled width Wr. When the edge of the groove 20 is not rounded, the width W of the groove 20 and the ruled width Wr coincide.

なお、ルール上の幅Ｗｒは０．９（ｍｍ）以下であることが定められている。また、ルール上、溝の深さＤは０．５（ｍｍ）以下である。更に、ルール上、溝のピッチ（溝の中心線ＣＬ間の距離）は「ルール上の幅」（Ｗｒ：ｍｍ）×４以上とされている。   Note that the rule width Wr is set to 0.9 (mm) or less. Further, according to the rule, the depth D of the groove is 0.5 (mm) or less. Further, according to the rules, the pitch of the grooves (distance between the center lines CL of the grooves) is “width on the rules” (Wr: mm) × 4 or more.

次に、溝２０の容積は溝２０の断面積が大きければ大きい程、大きくなる。溝２０の断面積の大きさ、換言すれば、溝２０の容積の大きさを評価する指標として、本実施形態では以下に述べる断面積比率を提案する。上記の通り、競技用ゴルフクラブヘッドのルール上、深さＤは０．５（ｍｍ）以下である。従って、溝２０の縁に丸みがない場合であって、溝２０のルール上の幅Ｗｒの場合の溝２０の最大断面積は、図２（Ｂ）の右に示すようにＷｒ（ｍｍ）×０．５（ｍｍ）＝０．５・Ｗｒ（ｍｍ2）である。 Next, the volume of the groove 20 increases as the cross-sectional area of the groove 20 increases. As an index for evaluating the size of the cross-sectional area of the groove 20, in other words, the size of the volume of the groove 20, the present embodiment proposes the cross-sectional area ratio described below. As described above, the depth D is 0.5 (mm) or less due to the rules of the competition golf club head. Therefore, when the edge of the groove 20 is not rounded and the width Wr on the rule of the groove 20 is, the maximum cross-sectional area of the groove 20 is Wr (mm) × 0.5 (mm) = 0.5 · Wr (mm 2 ).

そこで、この最大断面積に対する溝２０の断面積Ｓ（ｍｍ2：図２（Ｂ）の左参照）の断面積比率は溝２０の容積の大きさを評価する指標となる。断面積比率は下式（１）で表される。
断面積比率（％）＝Ｓ／（Ｗｒ×０．５）×１００ ・・・式（１）
次に、フェース面１０における溝２０の面積比率はボールのスピン量に影響する。本実施形態では溝２０の面積比率の指標として以下の式（２）から導かれる溝面積比率を提案する。
溝面積比率（％）＝Ｗ／Ｗｓ×１００ ・・・式（２）
本実施形態のゴルフクラブヘッド１では、溝２０の縁２４に半径０．２ｍｍ以下の丸みが形成されることで、ボールに傷がつくことを低減する。一方、上記式（２）により規定される溝２０の溝面積比率と、上記式（１）により規定される溝２０の断面積比率との兼ね合いにより雨天時やラフからのショットの場合にボールのスピン量が大きく低減することを防止できる。本実施形態では溝２０の上記溝面積比率を３５％以上とし、溝２０の上記断面積比率を７０％以上とする。 Therefore, the cross-sectional area ratio of the cross-sectional area S (mm 2 : see the left in FIG. 2B) of the groove 20 to the maximum cross-sectional area is an index for evaluating the volume of the groove 20. The cross-sectional area ratio is expressed by the following formula (1).
Cross-sectional area ratio (%) = S / (Wr × 0.5) × 100 (1)
Next, the area ratio of the groove 20 on the face surface 10 affects the spin amount of the ball. In the present embodiment, a groove area ratio derived from the following equation (2) is proposed as an index of the area ratio of the groove 20.
Groove area ratio (%) = W / Ws × 100 Formula (2)
In the golf club head 1 of the present embodiment, the roundness having a radius of 0.2 mm or less is formed on the edge 24 of the groove 20 to reduce the damage to the ball. On the other hand, due to the balance between the groove area ratio of the groove 20 defined by the above formula (2) and the cross-sectional area ratio of the groove 20 defined by the above formula (1), in the case of a rainy shot or a shot from the rough, It is possible to prevent the spin amount from being greatly reduced. In the present embodiment, the groove area ratio of the groove 20 is set to 35% or more, and the cross-sectional area ratio of the groove 20 is set to 70% or more.

図３は本発明の実施例１乃至５と、従来例である比較例１乃至７とで、溝の仕様を変えてボールの損傷度（ささくれ度）とスピン量とを測定した実験の結果を示す。実験はロフト角５６度のサンドウェッジに仕様の異なる溝を形成し、ロボットマシーンにて未使用のボールを打つことにより行なった。サンドウェッジのヘッドスピードは４０ｍ／ｓである。また、晴天時でのショットの場合と雨天時及びラフからのショットの場合とを想定して、フェース面が乾いた場合（ドライ）、フェース面を水で濡れた薄い紙で覆った場合（ウェット）についてそれぞれ１０発ずつボールを打つことにした。   FIG. 3 shows the results of an experiment in which the degree of damage (breaking degree) and spin amount of a ball were measured by changing the groove specifications in Examples 1 to 5 of the present invention and Comparative Examples 1 to 7 which are conventional examples. Show. The experiment was performed by forming grooves with different specifications on a sand wedge with a loft angle of 56 degrees and hitting an unused ball on a robot machine. The head speed of the sand wedge is 40 m / s. In addition, when the shot is taken on a sunny day, when it is raining or shot from the rough, the face is dry (dry), or the face is covered with thin paper wet with water (wet) ) About 10 balls each.

図３において、「溝の仕様」は比較例及び実施例の各溝の仕様を示す。いずれの比較例及び実施例においても、溝の断面形状は図１（Ｂ）に示したような台形である。「角度θ」は溝の側面間の角度（図１（Ｂ）の角度θ）である。「丸みの半径」は溝の縁に付けられる丸みの半径である。比較例１乃至３は溝の縁に丸みがつけられていない。「溝幅Ｗ」は図２（Ａ）を参照して説明した、丸みを含めて測定した場合の溝の幅であり、「ルール上の溝幅Ｗｒ」は３０度測定方法により測定した場合の溝の幅である。   In FIG. 3, “groove specifications” indicate the specifications of the grooves of the comparative example and the example. In any of the comparative examples and examples, the cross-sectional shape of the groove is a trapezoid as shown in FIG. “Angle θ” is an angle between the side surfaces of the groove (an angle θ in FIG. 1B). “Round radius” is the radius of the round that is applied to the edge of the groove. In Comparative Examples 1 to 3, the edge of the groove is not rounded. “Groove width W” is the width of the groove measured with roundness described with reference to FIG. 2A, and “groove width Wr on the rule” is the value when measured by the 30-degree measurement method. The width of the groove.

「溝間の幅Ｗｓ」は図２（Ａ）を参照して説明した幅Ｗｓである。「ピッチ」は溝の中心線（図１（Ｂ）の中心線ＣＬ）間の距離である。「溝面積比率」は上記式（２）により算出された上記溝面積比率である。深さＤはフェース面から溝の底面までの距離である。「断面積Ｓ」は溝の断面積である。「断面積比率」は上記式（１）により算出された上記断面積比率である。   “Width Ws between grooves” is the width Ws described with reference to FIG. “Pitch” is the distance between the center lines of the grooves (center line CL in FIG. 1B). The “groove area ratio” is the groove area ratio calculated by the above equation (2). The depth D is a distance from the face surface to the bottom surface of the groove. “Cross sectional area S” is the sectional area of the groove. The “cross-sectional area ratio” is the above-described cross-sectional area ratio calculated by the above formula (1).

次に、「実験結果」のうち、「ささくれ度」はフェース面がドライの場合において、ショット後のボールの表面の荒れ具合を３人の評価者が目視及び触感にて観察し、１０段階で評価したものである。この実験において最もボールの表面が荒れたものを１０とし、最も荒れていないものを１とした。「スピン量」はボールの表面にマークを予め付したおき、インパクト時のボールをビデオカメラで撮影してマークの位置の変化により算出したものである。ドライ、ウェットそれぞれについて１０発のショットの平均値である。   Next, among the “experimental results”, the “delaying degree” indicates that when the face surface is dry, three evaluators visually and tactilely observe the roughness of the surface of the ball after the shot. It has been evaluated. In this experiment, 10 was the most rough surface of the ball and 1 was the least rough surface. The “spin amount” is calculated by changing the position of the mark by marking the surface of the ball in advance and shooting the ball at impact with a video camera. The average value of 10 shots for each of dry and wet.

「ルール適合」は比較例１乃至７、実施例１乃至５のゴルフクラブヘッドが、競技用ゴルフクラブヘッドのルールに適合するか否かを示す。比較例３のみが、溝のピッチの点でルールに適合していない。   “Rule conformance” indicates whether the golf club heads of Comparative Examples 1 to 7 and Examples 1 to 5 conform to the rules of the competition golf club head. Only Comparative Example 3 does not conform to the rule in terms of groove pitch.

図４（Ａ）は図３の実験結果のうち「ささくれ度」を棒グラフ化したものである。図４（Ｂ）は図３の実験結果をドライとウェットに分けて「溝面積比率」−「スピン量」の関係でグラフ化したものである。図４（Ｃ）は図３の実験結果をドライとウェットに分けて「断面積比率」−「スピン量」の関係でグラフ化したものである。   FIG. 4 (A) is a bar graph of the “delaying degree” in the experimental results of FIG. FIG. 4B is a graph in which the experimental results of FIG. 3 are divided into dry and wet, and the relationship is “groove area ratio” − “spin amount”. FIG. 4C is a graph of the experimental result of FIG. 3 divided into dry and wet, with a relationship of “cross-sectional area ratio” − “spin amount”.

「ささくれ度」について見ると、角度θが小さくかつ溝の縁に丸みのない比較例１乃至３はささくれが多くなっている。従って、溝の縁に丸みを付けることはボールに傷がつくことを防止するために有効である。   Looking at the “depression degree”, Comparative Examples 1 to 3 in which the angle θ is small and the edge of the groove is not rounded are increased. Therefore, rounding the edge of the groove is effective for preventing the ball from being damaged.

「スピン量」について見ると、比較例２及び３はウエット時においてもスピン量が多く、特に比較例３についてはウエット時のスピン量がドライ時のスピン量を上回っている。しかし、比較例２及び３は上記の通り「ささくれ度」が悪いため、実用性が悪い。   As for “spin amount”, Comparative Examples 2 and 3 have a large amount of spin even in the wet state, and in Comparative Example 3, the spin amount in the wet state exceeds the spin amount in the dry state. However, Comparative Examples 2 and 3 have poor practicability because of the poor “breaking degree” as described above.

比較例１や比較例４は、「断面積比率」は比較的大きい（いずれも７０％以上）がドライ時とウエット時のスピン量の落差が大きい。これは「溝面積比率」が小さい（それぞれ、１０％、２５％））ことに起因していると考えられる。実施例１は「溝面積比率」が実施例１乃至５の中で最も小さい（３８％）が、比較例１や比較例４と比べると、ウエット時のスピン量の低下が小さい。   In Comparative Examples 1 and 4, the “cross-sectional area ratio” is relatively large (both 70% or more), but the difference in spin amount between dry and wet is large. This is considered to be caused by the fact that the “groove area ratio” is small (10% and 25%, respectively). In Example 1, the “groove area ratio” is the smallest among Examples 1 to 5 (38%), but compared with Comparative Example 1 and Comparative Example 4, the decrease in the spin rate during wet is small.

比較例５乃至７は「溝面積比率」は比較的大きいがドライ時とウエット時のスピン量の落差が大きい。これは「断面積比率」が小さい（それぞれ、５９％、６３％、５０％）ことに起因していると考えられる。実施例３及び５は「断面積比率」が実施例１乃至５の中で最も小さい（７０％）が、比較例５乃至７と比べると、ウエット時のスピン量の低下が小さい。   In Comparative Examples 5 to 7, the “groove area ratio” is relatively large, but the difference in spin amount between dry and wet is large. This is considered to be caused by the small “cross-sectional area ratio” (59%, 63%, and 50%, respectively). In Examples 3 and 5, the “cross-sectional area ratio” is the smallest among Examples 1 to 5 (70%), but compared with Comparative Examples 5 to 7, the decrease in the spin rate during wet is small.

以上の実験結果を踏まえると、ウエット時のスピン量は「溝面積比率」と「断面積比率」との兼ね合いで向上することができることが分かる。そして、実施例１乃至５の「溝面積比率」、「断面積比率」からすると、「溝面積比率」は３５％以上とし、「断面積比率」は７０％以上とすると、ウエット時のスピン量の低下の小さいゴルフクラブが得られると言える。   Based on the above experimental results, it can be seen that the amount of spin during wet can be improved by the balance between the “groove area ratio” and the “cross-sectional area ratio”. From the “groove area ratio” and “cross-sectional area ratio” in Examples 1 to 5, the “groove area ratio” is set to 35% or more, and the “cross-sectional area ratio” is set to 70% or more. It can be said that a golf club with a small decrease in the temperature can be obtained.

なお、本発明のゴルフクラブヘッドを競技用に用いる場合、ルール上の溝幅Ｗｒは０．９（ｍｍ）以下とする必要がある。しかし、ルール上の溝幅Ｗｒを余り狭くすると溝の断面積も狭くなる。実施例３ではルール上の溝幅Ｗｒを０．６（ｍｍ）としているが、ウエット時のスピン量は他の実施例１、２、４及び５と比べると大きく低下していない。従って、本発明のゴルフクラブヘッドの溝の、ルール上の溝幅Ｗｒは０．６（ｍｍ）以上０．９（ｍｍ）以下であることが好ましい。   When the golf club head of the present invention is used for competition, the groove width Wr on the rule needs to be 0.9 (mm) or less. However, if the groove width Wr on the rule is too narrow, the cross-sectional area of the groove is also narrowed. In the third embodiment, the groove width Wr on the rule is set to 0.6 (mm), but the amount of spin at the time of wet is not greatly reduced as compared with the other embodiments 1, 2, 4 and 5. Therefore, it is preferable that the groove width Wr on the rule of the groove of the golf club head of the present invention is 0.6 (mm) or more and 0.9 (mm) or less.

（Ａ）は本発明の一実施形態に係るゴルフクラブヘッド１の外観図、（Ｂ）は溝２０の断面図である。1A is an external view of a golf club head 1 according to an embodiment of the present invention, and FIG. （Ａ）は溝２０の縁に丸みを設けた場合の説明図、（Ｂ）は断面積比率の説明図、（Ｃ）は３０度測定法の説明図である。(A) is explanatory drawing at the time of providing the roundness of the edge of the groove | channel 20, (B) is explanatory drawing of a cross-sectional area ratio, (C) is explanatory drawing of a 30 degree | times measuring method. 本発明の実施例と、比較例との実験条件及び実験結果を示す図である。It is a figure which shows the experimental condition and experimental result of the Example of this invention, and a comparative example. （Ａ）乃至（Ｃ）は本発明の実施例と、比較例との実験結果を示す図である。(A) thru | or (C) is a figure which shows the experimental result of the Example of this invention, and a comparative example.

符号の説明Explanation of symbols

１ ゴルフクラブヘッド
１０ フェース面
２０ 溝
２１、２２ 側面
２４ 溝の縁 1 Golf club head 10 Face surface 20 Grooves 21 and 22 Side surface 24 Groove edge

Claims (2)

フェース面に複数の溝が形成されたゴルフクラブヘッドにおいて、
前記溝の縁に半径０．２ｍｍ以下の丸みが形成され、
前記丸みを含めて測定した場合の前記溝の幅Ｗ（ｍｍ）、隣接する前記溝間の幅Ｗｓ（ｍｍ）、３０度測定法により測定した場合の前記溝の幅Ｗｒ（ｍｍ）、及び、前記溝の断面積Ｓ（ｍｍ2）が、
Ｗ／Ｗｓ×１００≧３５（％）、
Ｓ／（Ｗｒ×０．５）×１００≧７０（％）
であることを特徴とするゴルフクラブヘッド。 In the golf club head having a plurality of grooves formed on the face surface,
A roundness with a radius of 0.2 mm or less is formed at the edge of the groove,
The width W (mm) of the groove when measured including the roundness, the width Ws (mm) between the adjacent grooves, the width Wr (mm) of the groove when measured by a 30 degree measurement method, and The sectional area S (mm 2 ) of the groove is
W / Ws × 100 ≧ 35 (%),
S / (Wr × 0.5) × 100 ≧ 70 (%)
A golf club head characterized by the above. 前記幅Ｗｒが０．６ｍｍ以上０．９ｍｍ以下であることを特徴とする請求項１に記載のゴルフクラブヘッド。   The golf club head according to claim 1, wherein the width Wr is 0.6 mm or more and 0.9 mm or less.
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GB0709616A GB2440799A (en) 2006-08-07 2007-05-18 Golf club head with grooves for improved backspin and reduced scuffing
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CN101898028A (en) * 2009-05-28 2010-12-01 住胶体育用品株式会社 Glof club head
JP2010273816A (en) * 2009-05-28 2010-12-09 Sri Sports Ltd Golf club head
JP2010279456A (en) * 2009-06-03 2010-12-16 Sri Sports Ltd Golf club head
JP2010284232A (en) * 2009-06-10 2010-12-24 Sri Sports Ltd Golf club head
US8251835B2 (en) 2009-06-10 2012-08-28 Sri Sports Limited Golf club head
JP2018134432A (en) * 2014-08-26 2018-08-30 カーステン マニュファクチュアリング コーポレーション Club heads with varying groove parameters and related methods

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KR20080013754A (en) 2008-02-13
KR101335089B1 (en) 2013-12-03

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