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JP2005137788A - Golf club head - Google Patents

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JP2005137788A
JP2005137788A JP2003380218A JP2003380218A JP2005137788A JP 2005137788 A JP2005137788 A JP 2005137788A JP 2003380218 A JP2003380218 A JP 2003380218A JP 2003380218 A JP2003380218 A JP 2003380218A JP 2005137788 A JP2005137788 A JP 2005137788A
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crown
sole
head
golf club
club head
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JP4373765B2 (en
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Yasushi Sugimoto
靖司 杉本
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head for improving not only the launch angle of a ball but even a rebound coefficient. <P>SOLUTION: The golf club head 1 includes: a face part 2; and a head main body part 3 extending from the rear surface 2B of the face part 2 to the rear part of the head. The head main body part 3 has a hollow structure comprising: a crown part 4; a sole part 5; and a side part 6 which respectively form a head upper part, a head bottom part, and a head side part. The crown part 4 includes: a crown front part 4a forming a front area Lca from the rear surface 2B to a position at distance being 0.15 times of crown depth length Lc; and a crown rear part 4b forming a rear area Lcb from the rear surface 2B to a position at distance being 0.30-1.0 times of the crown depth length Lc. The crown front part 4a has rigidity smaller than that of the crown rear part 4b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、打球の飛距離を増大しうるゴルフクラブヘッドに関する。   The present invention relates to a golf club head that can increase the flight distance of a hit ball.

打球の飛距離を増大させるために、ゴルフクラブヘッドのフェース部に関して種々の改良が提案されている。具体的には、フェース部の周辺部の厚さを小さくしたいわゆる周辺薄肉構造や、フェース部に強度が高く弾性率が小さい材料等の採用を挙げることができる。これにより、フェース部の反発係数が大きくなり、ボールの打ち出し初速を高める。しかしながら、フェース部の改善だけでは、反発係数の増加については自ずと限界がある。   In order to increase the flight distance of the hit ball, various improvements have been proposed for the face portion of the golf club head. Specifically, a so-called peripheral thin-walled structure in which the thickness of the peripheral portion of the face portion is reduced, or a material having a high strength and a low elastic modulus for the face portion can be used. Thereby, the coefficient of restitution of the face portion is increased, and the initial launching speed of the ball is increased. However, there is a limit to the increase in the coefficient of restitution only by improving the face part.

近年、ウッド型のゴルフクラブヘッドにおいて、クラウン部の剛性を小さくすることにより、打球時にクラウン部を大きく撓ませボールの打ち出し角度を大きくすることによって飛距離を増大させる試みがなされている（下記特許文献１参照）   In recent years, in wood-type golf club heads, attempts have been made to increase the flight distance by reducing the rigidity of the crown portion to greatly deflect the crown portion at the time of hitting and increasing the ball launch angle (the following patents). Reference 1)

特開２００３−８８６０１号公報JP 2003-88601 A

しかしながら、上記の提案では、打球時にクラウン部全体が大きく変形する。このため、ヘッドの運動エネルギーの多くがクラウン部を広範囲に変形させるのに消費され、エネルギーロスが大きくそのスプリング効果自体は小さい。つまり、上記提案では、打ち出し角度は大きくできるものの反発係数を大きく維持することは難しい。   However, in the above proposal, the entire crown portion is greatly deformed at the time of hitting. For this reason, much of the kinetic energy of the head is consumed to deform the crown portion over a wide range, and the energy loss is large and the spring effect itself is small. That is, in the above proposal, although the launch angle can be increased, it is difficult to maintain a large coefficient of restitution.

本発明は、以上のような実情に鑑み案出なされたもので、フェース部の背面に連なりヘッド後方にのびるヘッド本体部におけるクラウン部が、フェース部側のクラウン前部と、その後方に設けられたクラウン後部とを含み、かつ、クラウン前部はクラウン後部よりも小さい剛性を有することを基本として、ボールの打ち出し角のみならず反発係数についても向上しうるゴルフクラブヘッドを提供することを目的としている。   The present invention has been devised in view of the above situation, and a crown portion in a head main body portion that is continuous with the back surface of the face portion and extends rearward of the head is provided on the front crown portion on the face portion side and behind the crown portion. And a golf club head that can improve not only the ball launch angle but also the coefficient of restitution, based on the fact that the crown front portion has a lower rigidity than the crown rear portion. Yes.

本発明のうち請求項１記載の発明は、ボールを打球するフェース面を有するフェース部と、このフェース部の背面に連なりヘッド後方にのびるヘッド本体部とを有し、かつ、ヘッド本体部は、ヘッド上部、ヘッド底部及びヘッド側部をそれぞれ形成するクラウン部、ソール部及びサイド部を含む中空構造のゴルフクラブヘッドであって、前記クラウン部は、前記背面からクラウン奥行き長さＬｃの０．１５倍の距離を隔てる位置までの前方領域をなすクラウン前部と、前記背面からクラウン奥行き長さＬｃの０．３０倍以上かつ１．０倍の後方領域をなすクラウン後部とを含み、かつ、クラウン前部は前記クラウン後部よりも小さい剛性を有することを特徴とするゴルフクラブヘッドである。   The invention according to claim 1 of the present invention has a face portion having a face surface for hitting a ball, and a head main body portion extending to the back of the head connected to the back surface of the face portion, and the head main body portion includes: A golf club head having a hollow structure including a crown portion, a sole portion, and a side portion forming a head top portion, a head bottom portion, and a head side portion, respectively, wherein the crown portion has a crown depth length Lc of 0.15 from the back surface. A crown front portion forming a front region up to a position separated by a double distance, and a crown rear portion forming a rear region not less than 0.30 times and 1.0 times the crown depth length Lc from the back surface, The front part has a smaller rigidity than that of the rear part of the crown.

また請求項２記載の発明は、前記ソール部は、前記背面からソール奥行き長さＬｓの０．１５倍の距離を隔てる位置までの前方領域をなすソール前部と、前記背面からソール奥行き長さＬｓの０．３０倍以上かつ１．０倍の後方領域をなすソール後部とを含み、かつ、前記ソール前部は前記ソール後部よりも小さい剛性を有することを特徴とする請求項１記載のゴルフクラブヘッドである。   In the invention according to claim 2, the sole portion includes a sole front portion that forms a front region from the back surface to a position that is separated by a distance 0.15 times the sole depth length Ls, and the sole depth length from the back surface. 2. The golf according to claim 1, further comprising: a rear portion of the sole that forms a rear region that is 0.30 times or more and 1.0 times of Ls, and the front portion of the sole has rigidity smaller than that of the rear portion of the sole. Club head.

また請求項３記載の発明は、前記クラウン部は、前記クラウン前部の平均厚さｔｃ１が、前記クラウン後部の平均厚さｔｃ２よりも小さいことを特徴とする請求項１又は２に記載のゴルフクラブヘッドである。   According to a third aspect of the invention, in the golf according to claim 1 or 2, the crown portion has an average thickness tc1 of the crown front portion smaller than an average thickness tc2 of the crown rear portion. Club head.

また請求項４記載の発明は、前記クラウン後部は、その内面側にヘッド前後方向にのびる１ないし複数本の突状のクラウンリブが設けられ、前記クラウン前部は該クラウンリブが設けられていないことを特徴とする請求項１記載のゴルフクラブヘッドである。   According to a fourth aspect of the present invention, the crown rear portion is provided with one or a plurality of protruding crown ribs extending in the front-rear direction of the head on the inner surface side, and the crown front portion is not provided with the crown rib. The golf club head according to claim 1, wherein:

また請求項５記載の発明は、ボールを打球するフェース面を有するフェース部と、このフェース部の背面に連なりヘッド後方にのびるヘッド本体部とを有し、かつ、ヘッド本体部は、ヘッド上部、ヘッド底部及びヘッド側部をそれぞれ形成するクラウン部、ソール部及びサイド部を含む中空構造のゴルフクラブヘッドであって、前記ソール部は、前記背面からソール奥行き長さＬｓの０．１５倍の距離を隔てる位置までの前方領域をなすソール前部と、前記背面からソール奥行き長さＬｓの０．３０倍以上かつ１．０倍の後方領域をなすソール後部とを含み、かつ、前記ソール前部は前記ソール後部よりも小さい剛性を有することを特徴とするゴルフクラブヘッドである。   The invention according to claim 5 has a face portion having a face surface for hitting a ball, and a head main body portion extending to the back of the head and extending to the back of the face portion, and the head main body portion includes an upper portion of the head, A golf club head having a hollow structure including a crown portion, a sole portion, and a side portion forming a head bottom portion and a head side portion, respectively, wherein the sole portion is a distance of 0.15 times the sole depth length Ls from the back surface. A sole front portion that forms a front region up to a position that separates the sole, and a sole rear portion that forms a rear region that is 0.30 times and 1.0 times the sole depth length Ls from the back surface, and the sole front portion Is a golf club head having rigidity smaller than that of the rear portion of the sole.

また請求項６記載の発明は、前記ソール部は、前記ソール前部の平均厚さｔｓ１が、前記ソール後部の平均厚さｔｓ２よりも小さいことを特徴とする請求項５に記載のゴルフクラブヘッドである。   According to a sixth aspect of the present invention, in the golf club head according to the fifth aspect, the sole portion has an average thickness ts1 of the front portion of the sole that is smaller than an average thickness ts2 of the rear portion of the sole. It is.

また請求項７記載の発明は、前記ソール後部は、その内面側にヘッド前後方向にのびる１ないし複数本の突状のソールリブが設けられ、前記ソール前部は該ソールリブが設けられていないことを特徴とする請求項５に記載のゴルフクラブヘッドである。   According to a seventh aspect of the present invention, the sole rear portion is provided with one or more protruding sole ribs extending in the front-rear direction of the head on the inner surface side, and the sole front portion is not provided with the sole rib. The golf club head according to claim 5, wherein the golf club head is a golf club head.

本発明のゴルフクラブヘッドは、クラウン部のフェース部側に剛性が小さいクラウン前部を有するため、打球時にこの部分を大きく弾性変形させて撓ませることができる。これにより、フェース部の見かけ上のロフト角を大きくし、ボールの打ち出し角度を大きくできる。またクラウン前部の後方には、剛性が大きいクラウン後部が設けらるため、打球時におけるクラウン部の弾性変形はクラウン前部の小さい範囲に制限できる。この結果、エネルギーロスが小さく、クラウン前部の撓みの復元に伴うスプリング効果が効率良く生じ、反発係数の向上も期待できる。このように、本発明のゴルフクラブヘッドは、打ち出し角と反発係数との双方を向上させて打球の飛距離を増大しうる。   Since the golf club head of the present invention has a crown front portion with low rigidity on the face side of the crown portion, this portion can be bent by being elastically deformed greatly at the time of hitting. As a result, the apparent loft angle of the face portion can be increased and the ball launch angle can be increased. Further, since a crown rear portion having high rigidity is provided behind the crown front portion, elastic deformation of the crown portion at the time of hitting can be limited to a small range of the crown front portion. As a result, the energy loss is small, the spring effect accompanying the restoration of the bending of the crown front portion is efficiently generated, and an improvement in the coefficient of restitution can be expected. As described above, the golf club head of the present invention can improve both the launch angle and the coefficient of restitution, and increase the flight distance of the hit ball.

以下、本発明の実施の一形態を図面に基づき説明する。
図１は、本発明の実施形態を示すゴルフクラブヘッドの基準状態の全体斜視図、図２はその平面図、図３は、図２のＡ−Ａ断面図、図４は図３のＹ部拡大図である。ここで、基準状態とは、ゴルフクラブヘッド（以下、単に「ヘッド」ということがある。）１のシャフト軸線（後述するシャフト差込孔７ａの軸中心線ＣＬで代用する。）を垂直面ＶＰ内に配して当該ヘッド１に定められたライ角で傾けかつ水平面ＨＰに接地させるとともに、ヘッド重心Ｇからフェース面Ｆに引いた法線Ｎを水平面ＨＰに投影した投影法線が前記垂直面ＶＰと直角をなる状態として定める。どのようなヘッドであっても、シャフト軸線をライ角で保持ししたまま該シャフト軸線周りでヘッド１を回転させることにより上述の位置に設定できる。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 is an overall perspective view of a reference state of a golf club head showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. It is an enlarged view. Here, the reference state refers to a vertical axis VP of a shaft axis line of a golf club head (hereinafter, simply referred to as “head”) 1 (a shaft center line CL of a shaft insertion hole 7a described later). The projection normal obtained by projecting the normal line N drawn from the head center of gravity G to the face surface F onto the horizontal plane HP is inclined to the horizontal plane HP by being arranged at a lie angle determined on the head 1 and grounded to the horizontal plane HP. A state perpendicular to VP is defined as a state. Any head can be set to the above-described position by rotating the head 1 around the shaft axis while keeping the shaft axis at the lie angle.

本実施形態のヘッド１は、ボールを打球するフェース面Ｆを有するフェース部２と、このフェース部２の背面２Ｂに連なりヘッド後方にのびるヘッド本体部３とを有する。本実施形態のヘッド１は、金属材料により構成されたウッド型のものが例示されており、内部には中空部ｉが設けられた中空構造のものが示される。   The head 1 of the present embodiment includes a face portion 2 having a face surface F for hitting a ball, and a head main body portion 3 that extends to the back of the head and extends to the back surface 2B of the face portion 2. The head 1 of this embodiment is exemplified by a wood type made of a metal material, and a hollow structure with a hollow portion i provided therein is shown.

前記フェース部２は、その外表面であり、かつ、ボールを打球するフェース面Ｆと、その反対側の面である背面２Ｂとを有する。フェース部２の厚さは本実施形態では実質的に一定としているが、周辺部を薄くした周辺薄肉構造などを採用することも勿論構わない。また、フェース面Ｆには、フェースライン等の溝（図示せず）が設けられることもある。フェース部２の前記背面２Ｂは、図４に示されるように、ヘッドの中空部ｉに面した主背面２Ｂ１と、この主背面２Ｂ１の外縁Ｐａから垂直にのびるものとして仮想設定される周縁背面２Ｂ２とを含むものとする。そして、ヘッド本体部３は、この周縁背面２Ｂ２に連なってヘッド後方へとのびている。   The face portion 2 is an outer surface of the face portion 2 and has a face surface F for hitting a ball and a back surface 2B which is an opposite surface. Although the thickness of the face portion 2 is substantially constant in the present embodiment, it is needless to say that a thin peripheral structure with a thin peripheral portion may be adopted. The face surface F may be provided with grooves (not shown) such as face lines. As shown in FIG. 4, the back surface 2B of the face portion 2 includes a main back surface 2B1 facing the hollow portion i of the head and a peripheral back surface 2B2 virtually set as extending vertically from the outer edge Pa of the main back surface 2B1. And And the head main-body part 3 is continued to this peripheral back surface 2B2, and has extended back of the head.

ヘッド本体部３は、ヘッド上部、ヘッド底部及びヘッド側部をそれぞれ形成するクラウン部４、ソール部５及びサイド部６を含み、さらにクラウン部４のヒール側にはネック部７が設けられている。ネック部７は、図示しないシャフトが差し込まれる円筒状のシャフト差込孔７ａが形成される。このシャフト差込孔７ａの軸中心線ＣＬはシャフト軸線と実質的に一致するため、ライ角の設定時にはシャフト軸線よして代用できる。フェース部２とヘッド本体部３とは鋳造等により予め一体に接合されていても良く、また溶接等によって接合されても良い。   The head main body 3 includes a crown part 4, a sole part 5, and a side part 6 that respectively form a head upper part, a head bottom part, and a head side part, and a neck part 7 is provided on the heel side of the crown part 4. . The neck portion 7 is formed with a cylindrical shaft insertion hole 7a into which a shaft (not shown) is inserted. Since the shaft center line CL of the shaft insertion hole 7a substantially coincides with the shaft axis line, the shaft axis line can be substituted when the lie angle is set. The face portion 2 and the head main body portion 3 may be integrally joined in advance by casting or the like, or may be joined by welding or the like.

本実施形態のヘッド１は、図３に示されるように、クラウン部４が、フェース部２の背面２Ｂからクラウン奥行き長さＬｃの０．１５倍の距離を隔てる位置までの前方領域Ｌｃａをなすクラウン前部４ａと、前記背面２Ｂからクラウン奥行き長さＬｃの０．３０倍以上かつ１．０倍の後方領域Ｌｃｂをなすクラウン後部とを含み、かつ、クラウン前部４ａはクラウン後部４ｂよりも小さい剛性（曲げ剛性ＥＩ）を有している。ここで、クラウン奥行き長さＬは、前記フェース部２の背面２Ｂの外縁Ｐａのうちクラウン部側でかつ最もフェース面側の位置から中空部ｉにおけるクラウン部４の最もバックフェース側をなす後端縁Ｐｂまでの距離であり、かつ、前記基準状態における法線Ｎと平行な方向で測定される。   As shown in FIG. 3, the head 1 according to the present embodiment forms a front region Lca from the back surface 2 </ b> B of the face portion 2 to a position at a distance of 0.15 times the crown depth length Lc. A crown front portion 4a and a crown rear portion that forms a rear region Lcb of 0.30 times and 1.0 times the crown depth length Lc from the back surface 2B, and the crown front portion 4a is more than the crown rear portion 4b. It has a small rigidity (flexural rigidity EI). Here, the crown depth length L is the rear end of the outer edge Pa of the back surface 2B of the face portion 2 on the crown portion side and from the position closest to the face surface to the back face side of the crown portion 4 in the hollow portion i. It is a distance to the edge Pb and is measured in a direction parallel to the normal line N in the reference state.

図５に示されるように、ボールを打球した場合、クラウン前部４ａ、クラウン後部４ｂの各部には、それぞれ曲げモーメントＭｆ、Ｍｒが作用し、かつ、各部には曲げ剛性に応じた弾性変形（撓み）が生じる。曲げ剛性はこの撓みに対する抵抗を表すから、クラウン前部４ａは、クラウン後部４ｂよりも大きく撓む。従って、図６に示されるように、フェース面Ｆを小角度δで後傾させ、ひいては見かけ上のロフト角を大きくし、ボールの打ち出し角度を大にできる。これは、ボールを高く上げるのが苦手なゴルファに対して、有効に飛距離を増大させる。このように、打球時の見かけのロフト角を大きくするためには、クラウン部４の全体を大きく撓ませる必要はない。   As shown in FIG. 5, when a ball is hit, bending moments Mf and Mr act on the crown front portion 4a and the crown rear portion 4b, respectively, and each portion is elastically deformed according to the bending rigidity ( Deflection) occurs. Since the bending stiffness represents the resistance against this bending, the crown front portion 4a is bent more greatly than the crown rear portion 4b. Therefore, as shown in FIG. 6, the face surface F can be tilted backward at a small angle δ, and the apparent loft angle can be increased, thereby increasing the ball launch angle. This effectively increases the flight distance for golfers who are not good at raising the ball high. Thus, in order to increase the apparent loft angle at the time of hitting, it is not necessary to greatly bend the entire crown portion 4.

またクラウン前部４ａの後方には、剛性が大きいクラウン後部４ｂが設けらるため、打球時におけるクラウン部の弾性変形はクラウン前部の小さい範囲に集中する。これは、変形範囲を小さくすることでエネルギーロスを小さくし、該クラウン前部４ａに蓄積された弾性撓みの復元に伴うスプリング効果をより強くボールに作用させる。従って、反発係数についても向上できる。このように、本発明のゴルフクラブヘッドは、打ち出し角と反発係数との双方を向上させることができるという顕著な作用を奏する。   Further, since the crown rear portion 4b having high rigidity is provided behind the crown front portion 4a, elastic deformation of the crown portion at the time of hitting is concentrated in a small range of the crown front portion. This reduces the energy loss by reducing the deformation range, and more strongly acts on the ball with the spring effect accompanying the restoration of the elastic deflection accumulated in the crown front portion 4a. Therefore, the coefficient of restitution can be improved. Thus, the golf club head of the present invention has a remarkable effect that both the launch angle and the coefficient of restitution can be improved.

ここで、曲げ剛性ＥＩは、材料のヤング率と断面二次モーメントＩとの積で決まる。本明細書では、クラウン前部４ａとクラウン後部４ｂとのヤング率が同じ場合には、簡易手法として各々の平均厚さｔｃ１、ｔｃ２を比較してその大小を決定する。他方、クラウン前部４ａとクラウン後部４ｂとヤング率が異なる場合、ヤング率に前記平均厚さの３乗を乗じた値で大小を定める。   Here, the bending rigidity EI is determined by the product of the Young's modulus of the material and the cross-sectional secondary moment I. In this specification, when the Young's modulus of the crown front part 4a and the crown rear part 4b is the same, the average thicknesses tc1 and tc2 are compared as a simple method to determine the size. On the other hand, when the Young's modulus is different between the crown front part 4a and the crown rear part 4b, the magnitude is determined by a value obtained by multiplying the Young's modulus by the cube of the average thickness.

、本実施形態のヘッド１は、クラウン部４の内面及び外面が滑らかな面を有して連続しており、かつ、全域が同じ金属材料で形成されている。このため、クラウン前部４ａをクラウン後部４ｂよりも小さい曲げ剛性とするために、クラウン前部４ａの平均厚さｔｃ１を、クラウン後部４ｂの平均厚さｔｃ２よりも小さくした例を示す。 In the head 1 of this embodiment, the inner surface and the outer surface of the crown portion 4 are continuous with a smooth surface, and the entire region is formed of the same metal material. For this reason, in order to make the crown front part 4a have a bending rigidity smaller than that of the crown rear part 4b, an example is shown in which the average thickness tc1 of the crown front part 4a is smaller than the average thickness tc2 of the crown rear part 4b.

前記クラウン前部４ａの平均厚さｔｃ１は、特に限定はされないが、好ましくは０．５mm以上、より好ましくは０．６mm以上が望ましい。前記平均厚さｔｃ１が０．５mm未満ではクラウン前部４ａの強度が不足して耐久性を損ねる傾向がある。逆に前記平均厚さｔｃ１が大きすぎても、打球時にクラウン前部４ａを大きく撓ませることが困難になる傾向がある。好ましくは前記平均厚さｔｃ１は、前記下限値のいずれかとの組み合わせにおいて、２．０mm以下、より好ましくは１．２mm以下が望ましい。本実施形態のクラウン前部４ａは、実質的に一定の厚さで形成されたものが例示される。   The average thickness tc1 of the crown front portion 4a is not particularly limited, but is preferably 0.5 mm or more, more preferably 0.6 mm or more. If the average thickness tc1 is less than 0.5 mm, the strength of the crown front portion 4a is insufficient and the durability tends to be impaired. On the other hand, even if the average thickness tc1 is too large, it tends to be difficult to largely deflect the crown front portion 4a at the time of hitting. The average thickness tc1 is preferably 2.0 mm or less, more preferably 1.2 mm or less, in combination with any of the lower limit values. The crown front portion 4a of the present embodiment is exemplified by one formed with a substantially constant thickness.

ところで、前記ネック部７は、必要な強度を得るためにその周辺部を含めて厚さが大きく形成されているが、この部分はヘッドの反発には殆ど寄与していない。本明細書では、前記クラウン前部４ａに、このようなネック部７を含まないものとする。具体的には、前記シャフト差込孔７ａの軸中心線ＣＬを中心とする半径２０mmの円筒領域Ｘに含まれる部分は、クラウン前部４ａに含めないものとする。   By the way, the neck portion 7 is formed to have a large thickness including its peripheral portion in order to obtain a required strength, but this portion hardly contributes to the repulsion of the head. In this specification, it is assumed that the neck portion 7 is not included in the crown front portion 4a. Specifically, a portion included in the cylindrical region X having a radius of 20 mm centered on the axial center line CL of the shaft insertion hole 7a is not included in the crown front portion 4a.

またクラウン後部４ｂの平均厚さｔｃ２は、特に限定されるわけではないが、好ましくは０．７mm以上、より好ましくは１．０mm以上とするのが望ましい。前記平均厚さｔｃ２が０．７mm未満ではクラウン後部４ｂの剛性が低下するため、打球時にクラウン後部４ｂも大きく変形し、ひいてはエネルギーロスが大きくなって反発性能が低下しやすい傾向がある。逆に、平均厚さｔｃ２が大きすぎても、反発性能を悪化させる傾向がある。好ましくは、前記平均厚さｔｃ２は前記下限値のいずれかとの組み合わせにおいて、好ましくは３．０mm以下、より好ましくは２．５mm以下が望ましい。本実施形態のクラウン後部４ｂは、実質的に一定の厚さで形成されたものが例示される。   The average thickness tc2 of the crown rear portion 4b is not particularly limited, but is preferably 0.7 mm or more, more preferably 1.0 mm or more. When the average thickness tc2 is less than 0.7 mm, the rigidity of the crown rear portion 4b is lowered. Therefore, the crown rear portion 4b is also greatly deformed at the time of hitting the ball, and as a result, energy loss tends to be increased and the resilience performance tends to be lowered. Conversely, even if the average thickness tc2 is too large, the resilience performance tends to deteriorate. Preferably, the average thickness tc2 is preferably 3.0 mm or less, more preferably 2.5 mm or less in combination with any of the lower limit values. The crown rear portion 4b of the present embodiment is exemplified by one formed with a substantially constant thickness.

クラウン前部４ａの平均厚さｔｃ１と、クラウン後部４ｂの平均厚さｔｃ２との比（ｔｃ２／ｔｃ１）は、好ましくは１．２以上、より好ましくは１．５以上が望ましい。前記比（ｔｃ２／ｔｃ１）が１．２未満であると、クラウン前部４ａとクラウン後部４ｂの剛性が接近するため、打球時におけるクラウン部４の変形が広範囲に亘ったり、あるいはこれとは逆に変形が小さくなる傾向がある。一方、前記比（ｔｃ２／ｔｃ１）が大きすぎても、クラウン前部４ａの剛性を過度に低下させて耐久性を損ねたり、これとは逆にクラウン後部４ｂの剛性を過度に大きくして反発性能を低下させる傾向がある。このような観点より、前記比（ｔｃ２／ｔｃ１）の上限は、前記下限値のいずれかとの組み合わせにおいて、５．０以下、より好ましくは３．０以下とするのが望ましい。   The ratio (tc2 / tc1) between the average thickness tc1 of the crown front part 4a and the average thickness tc2 of the crown rear part 4b is preferably 1.2 or more, more preferably 1.5 or more. If the ratio (tc2 / tc1) is less than 1.2, the rigidity of the crown front part 4a and the crown rear part 4b approach each other, so that the deformation of the crown part 4 at the time of hitting a ball is wide or reverse. There is a tendency that the deformation becomes smaller. On the other hand, even if the ratio (tc2 / tc1) is too large, the rigidity of the crown front part 4a is excessively lowered to impair the durability, and conversely, the rigidity of the crown rear part 4b is excessively increased to repel. There is a tendency to reduce performance. From such a viewpoint, the upper limit of the ratio (tc2 / tc1) is preferably 5.0 or less, more preferably 3.0 or less in combination with any of the lower limit values.

なお各平均厚さの測定方法は、面積で重み付けして測定するものとする。すなわち、例えばクラウン前部４ａの平均厚さｔｃ１を例に挙げると、下記式で計算しうる。
ｔｃ１＝Σ（ｔｃ１i ・Ｓi ）／ΣＳi （ｉ＝１，２…）
ここで、ｔｃ１ｉはクラウン前部の任意の微小領域ａi の実厚さ、Ｓi は、前記微小領域ａi が占める面積とする。 In addition, the measuring method of each average thickness shall weight and measure with an area. That is, for example, when the average thickness tc1 of the crown front portion 4a is taken as an example, it can be calculated by the following formula.
tc1 = Σ (tc1 i · S i ) / ΣS i (i = 1, 2,...)
Here, tc1i is the actual thickness of an arbitrary minute area a i at the front of the crown, and S i is the area occupied by the minute area a i .

また、ヘッド１の周波数伝達関数の一次の極小値を示す周波数ｆは、一般に反発係数と逆相関があることが知られている。即ち、この周波数ｆを小さくしたヘッドは、反発係数が大きくなる。これはインピーダンスマッチング理論とも呼ばれる。本実施形態のヘッドは、前記周波数ｆの好ましい範囲、具体的には７００〜１２００Hzに容易に設定することができる。   Further, it is known that the frequency f indicating the first-order minimum value of the frequency transfer function of the head 1 is generally inversely correlated with the coefficient of restitution. That is, the restitution coefficient of a head with a reduced frequency f increases. This is also called impedance matching theory. The head of this embodiment can be easily set to a preferable range of the frequency f, specifically, 700 to 1200 Hz.

前記クラウン前部４ａとクラウン後部４ｂとの間の中間領域Ｌｃｃには、クラウン中間部４ｃが設けられている。クラウン中間部４ｃは、クラウン前部４ａと同一の剛性でも良いし、またクラウン後部４ｂと同じ剛性でも良い。クラウン中間部４ｃの平均厚さをｔｃ３とするとき、下記の関係が満たされ得る。
ｔｃ１＜ｔｃ２ かつ ｔｃ１≦ｔｃ３≦ｔｃ２ A crown intermediate portion 4c is provided in an intermediate region Lcc between the crown front portion 4a and the crown rear portion 4b. The crown intermediate part 4c may have the same rigidity as the crown front part 4a or the same rigidity as the crown rear part 4b. When the average thickness of the crown intermediate portion 4c is tc3, the following relationship can be satisfied.
tc1 <tc2 and tc1 ≦ tc3 ≦ tc2

本実施形態のクラウン中間部４ｃは、クラウン前部４ａと連なり、かつ、これと実質的に同一の厚さｔｃ１でのびる前部分４ｃ１と、クラウン後部４ｂと連なり、かつ、これと実質的に同一の厚さｔｃ２でのびる後部分４ｃ２と、前部分４ｃ１から後部分４ｃ２に厚さが漸増するテーパ状の継ぎ部分４ｃ３とから構成されている。このようなクラウン中間部は４ｃ、クラウン部４に大きな剛性段差が形成されるのを防ぎ、ひいては打球時の応力集中を緩和しうる点で好ましい。この例では、 ｔｃ１＜ｔｃ３＜ｔｃ２ の関係が満たされている。ただし、クラウン中間部４ｃの構成はこのような形状に限定されるものではない。   The crown intermediate portion 4c of the present embodiment is connected to the crown front portion 4a and is connected to the front portion 4c1 extending at substantially the same thickness tc1 and the crown rear portion 4b and substantially the same as this. The rear portion 4c2 extends at a thickness tc2 and a tapered joint portion 4c3 whose thickness gradually increases from the front portion 4c1 to the rear portion 4c2. Such a crown intermediate portion is preferable in that a large rigidity step is prevented from being formed on the crown portion 4 and the stress concentration at the time of hitting can be alleviated. In this example, the relationship of tc1 <tc3 <tc2 is satisfied. However, the configuration of the crown intermediate portion 4c is not limited to such a shape.

また剛性が小さいクラウン前部４ａは、フェース部２の背面２Ｂからクラウン奥行き長さＬｃの０．１５倍の長さの前方領域Ｌｃａに形成されることが必要である。クラウン前部４ａが、クラウン奥行き長さＬｃの０．１５倍未満の長さ領域であると、打球時に十分にクラウン部４を変形させることができず、打ち出し角度の向上が得られず、飛距離の向上には不利となる。一方、クラウン前部４ａは、フェース部２の背面２Ｂからクラウン奥行き長さＬｃの０．３０倍よりも小の範囲まで最大限延長しうる。   Further, the crown front part 4a having low rigidity needs to be formed in the front region Lca having a length 0.15 times the crown depth length Lc from the back surface 2B of the face part 2. When the crown front portion 4a is a region having a length less than 0.15 times the crown depth length Lc, the crown portion 4 cannot be sufficiently deformed at the time of hitting the ball, and the launch angle cannot be improved. It is disadvantageous for improving the distance. On the other hand, the crown front portion 4a can be extended from the back surface 2B of the face portion 2 to a range smaller than 0.30 times the crown depth length Lc.

また本実施形態のヘッド１は、ソール部５が、フェース部２の背面２Ｂからソール奥行き長さＬｓの０．１５倍の距離を隔てる位置までの前方領域Ｌｓａをなすソール前部５ａと、前記背面２Ｂからソール奥行き長さＬｓの０．３０倍以上かつ１．０倍の後方領域Ｌｓｂをなすソール後部５ｂとを含み、かつ、ソール前部５ｂはソール後部５ｂよりも小さい剛性を有するものが示される。   Further, the head 1 of this embodiment includes a sole front portion 5a that forms a front region Lsa from the back surface 2B of the face portion 2 to a position that is 0.15 times the sole depth length Ls, and the above-described sole portion 5a. And a sole rear portion 5b that forms a rear region Lsb that is 0.30 times or more and 1.0 times the sole depth length Ls from the back surface 2B, and the sole front portion 5b has rigidity smaller than that of the sole rear portion 5b. Indicated.

一般に、ボールをフェース面ＦのスイートスポットＳＳ（ヘッド重心Ｇからフェース面Ｆに引いた前記法線Ｎがフェース面Ｆと交わる点）よりも上側で打球した場合、前述の通りクラウン前部４ａをより効果的に撓ませてそのスプリング効果ないし打ち出し角の向上によって、飛距離の向上を図ることができる。一方、フェース面ＦのスイートスポットＳＳよりも相当下方位置でボールを打球した場合には、十分なクラウン前部４ａの撓みが得られない場合がある。   In general, when the ball is hit above the sweet spot SS of the face surface F (the point where the normal N drawn from the head center of gravity G to the face surface F intersects the face surface F), the crown front portion 4a is The flying distance can be improved by more effectively deflecting and improving the spring effect or launch angle. On the other hand, when the ball is hit at a position substantially below the sweet spot SS on the face surface F, there is a case where sufficient deflection of the crown front portion 4a cannot be obtained.

本実施形態では、ソール部５においても小さい剛性のソール前部５ａと、それよりも大きい剛性を有するソール後部５ｂとを含んで構成されているため、スイートスポットＳＳよりも下方での打撃に際しては、図７に示されるように、ソール前部５ａを効果的に弾性変形により撓ませることにより、小角度βでロフト角を見かけ上小としてボールの打ち出し角を小さくしうる。通常、スイートスポットＳＳよりも下方で打撃した場合には、ギア効果によってボールのバックスピン量が増えボールが高く吹け上がって飛距離をロスする傾向にあるから、本実施形態のヘッド１では、見かけ上のロフト角の減少によって、打球の吹け上がりを防止し飛距離の低下を最小限に抑えることができる。   In the present embodiment, since the sole portion 5 includes the sole front portion 5a having a small rigidity and the sole rear portion 5b having a rigidity higher than the sole portion 5, when the ball is hit below the sweet spot SS, As shown in FIG. 7, the ball launch angle can be made small by apparently reducing the loft angle at a small angle β by effectively bending the sole front part 5a by elastic deformation. Usually, when the ball is hit below the sweet spot SS, the backspin amount of the ball is increased due to the gear effect, and the ball tends to be blown up and the flight distance is lost. By reducing the upper loft angle, it is possible to prevent the hitting of the hit ball and minimize the decrease in the flight distance.

前記ソール前部５ａの平均厚さｔｓ１は、特に限定はされないが、好ましくは０．８mm以上、より好ましくは１．０mm以上が望ましい。前記平均厚さｔｓ１が０．８mm未満ではソール前部４ａの強度が不足して耐久性を損ねる傾向がある。逆に前記平均厚さｔｓ１大きすぎても、打球時にソール前部５ａを大きく撓ませることが困難になる傾向がある。このような観点より、前記平均厚さｔｓ１は、前記下限値のいずれかとの組み合わせにおいて、好ましくは２．０mm以下、より好ましくは１．５mm以下が望ましい。なお本実施形態のソール前部５ａは、実質的に一定の厚さで形成されたものが例示される。   The average thickness ts1 of the sole front portion 5a is not particularly limited, but is preferably 0.8 mm or more, more preferably 1.0 mm or more. If the average thickness ts1 is less than 0.8 mm, the strength of the sole front portion 4a is insufficient and the durability tends to be impaired. On the other hand, even if the average thickness ts1 is too large, it tends to be difficult to largely deflect the sole front portion 5a when hitting a ball. From such a viewpoint, the average thickness ts1 is preferably 2.0 mm or less, more preferably 1.5 mm or less, in combination with any one of the lower limit values. The sole front portion 5a of the present embodiment is exemplified by a substantially constant thickness.

またソール後部５ｂの平均厚さｔｓ２は、特に限定されるわけではないが、好ましくは１．０mm以上、より好ましくは１．２mm以上とするのが望ましい。前記平均厚さｔｓ２が１．０mm未満ではソール後部５ｂの剛性が低下するため、打球時にソール後部５ｂの撓み量が過度に大きくなり、エネルギーロスが大となって反発性能が低下しやすい。逆に、平均厚さｔｓ２が大きすぎても、反発性能を悪化させる傾向がある。このような観点より、平均厚さｔｓ２は、前記下限値のいずれかとの組み合わせにおいて、好ましくは２．５mm以下、より好ましくは２．０mm以下が望ましい。なお本実施形態のソール後部５ｂは、実質的に一定の厚さで形成されたものが例示される。なお剛性や各平均厚さの測定方法は前述のとおりである。   The average thickness ts2 of the sole rear portion 5b is not particularly limited, but is preferably 1.0 mm or more, more preferably 1.2 mm or more. When the average thickness ts2 is less than 1.0 mm, the rigidity of the sole rear portion 5b is lowered. Therefore, the amount of bending of the sole rear portion 5b is excessively large at the time of hitting, and the energy loss is increased and the resilience performance is likely to be lowered. Conversely, even if the average thickness ts2 is too large, the resilience performance tends to deteriorate. From such a viewpoint, the average thickness ts2 is preferably 2.5 mm or less, more preferably 2.0 mm or less, in combination with any one of the lower limit values. In addition, what was formed in the sole rear part 5b of this embodiment by substantially constant thickness is illustrated. The method for measuring the rigidity and each average thickness is as described above.

また図８（Ａ）に示されるように、ソール部５を実質的に一定の厚さで形成し、クラウン部４のみに前部４ａ、後部４ｂの剛性変化が設けても良く、また同図（Ｂ）のように、クラウン部４を実質的に一定の厚さで形成し、ソール部５のみに前部５ａ、後部５ｂを設けても良い。   Further, as shown in FIG. 8A, the sole portion 5 may be formed with a substantially constant thickness, and only the crown portion 4 may be provided with a change in rigidity of the front portion 4a and the rear portion 4b. As in (B), the crown portion 4 may be formed with a substantially constant thickness, and only the sole portion 5 may be provided with the front portion 5a and the rear portion 5b.

図９〜図１１には、本発明のさらに他の実施形態を示し、図９はヘッドの分解斜視図、図１０はヘッドの基準状態の平面図、図１１（Ａ）は図９のＢ−Ｂ断面図、同図（Ｂ）は図１１（Ａ）のＣ−Ｃ断面図である。   9 to 11 show still another embodiment of the present invention. FIG. 9 is an exploded perspective view of the head, FIG. 10 is a plan view of the reference state of the head, and FIG. B sectional drawing and the figure (B) are CC sectional views of Drawing 11 (A).

本実施形態のヘッド１は、クラウン前部４ａの剛性を、クラウン後部４ｂの剛性よりも小さくするために、クラウン後部４ｂの内面側にヘッド前後方向にのびる１ないし複数本（この例では複数本）の突状のクラウンリブ１１が突出形成されたものが例示される。クラウン前部４ａには、このようなクラウンリブ１１は設けられていない。また本実施形態では、クラウンリブ１１が設けられた部分以外のクラウン部４は、実質的に一定の厚さｔｃで形成されている。これにより、クラウンリブ１１が設けられていないクラウン前部４ａの剛性は、クラウン後部４ｂの剛性よりも小さくなる。   In the head 1 of this embodiment, in order to make the rigidity of the crown front part 4a smaller than the rigidity of the crown rear part 4b, one or a plurality (in this example, a plurality of parts) extends in the head longitudinal direction on the inner surface side of the crown rear part 4b. ) In which the projecting crown rib 11 is projected. Such a crown rib 11 is not provided in the crown front portion 4a. In the present embodiment, the crown portion 4 other than the portion where the crown rib 11 is provided is formed with a substantially constant thickness tc. Thereby, the rigidity of the crown front part 4a in which the crown rib 11 is not provided is smaller than the rigidity of the crown rear part 4b.

クラウンリブ１１は、図１１（Ａ）、（Ｂ）に示されるように、中空部ｉに向かって突出し、ヘッド１の前後方向に突条でのびている。クラウンリブ１１は、鋳造等により予めクラウン後部４ｂに一体に形成される他、接着剤や溶接、ロウ付け等による後付によってクラウン後部４の内側面に一体に設けることもできる。本実施形態ではクラウンリブ１１の断面形状は半円状であるが、矩形状、三角形状、楕円状或いはこれらの組み合わせ等などによって種々の断面形状が採用できる。またクラウンリブ１１がのびるヘッド前後方向とは、厳密なものでなくて良く、例えば前記基準状態において、前記水平面ＨＰに投影されたリブの両端を結ぶ直線が、前記投影法線に対して３０度以下ものを広く包含する。   As shown in FIGS. 11A and 11B, the crown rib 11 protrudes toward the hollow portion i and extends in the ridge direction in the front-rear direction of the head 1. The crown rib 11 can be formed integrally with the crown rear portion 4b in advance by casting or the like, or can be integrally provided on the inner surface of the crown rear portion 4 by retrofitting with an adhesive, welding, brazing, or the like. In this embodiment, the cross-sectional shape of the crown rib 11 is a semicircular shape, but various cross-sectional shapes can be adopted depending on a rectangular shape, a triangular shape, an elliptical shape, a combination thereof, or the like. Further, the head longitudinal direction in which the crown rib 11 extends may not be strict, and for example, in the reference state, a straight line connecting both ends of the rib projected onto the horizontal plane HP is 30 degrees with respect to the projection normal. Broadly includes:

また図１１（Ｂ）に示されるクラウンリブ１１の突出高さｈは、特に制限はないが、好ましくは０．５mm以上、より好ましくは０．６mm以上が望ましい。前記突出高さｈが０．５mm未満であると、クラウン後部４ｂの剛性を高めることが困難な傾向にあり、打球時にクラウン部４の全体が大きく撓んでしまうおそれがある。逆にクラウンリブ１１の突出高さｈが大きすぎてもクラウン後部４ｂの重量が過度に大きくなり、ヘッド重心Ｇの位置を高くする傾向がある好ましくない。このような観点より、クラウンリブ１１の突出高さｈの上限は、前記下限値のいずれかとの組み合わせにおいて３．０mm以下、より好ましくは１．５mm以下が望ましい。この高さｈは、一定でも良くまた変化しても良い。   The protrusion height h of the crown rib 11 shown in FIG. 11B is not particularly limited, but is preferably 0.5 mm or more, more preferably 0.6 mm or more. If the protruding height h is less than 0.5 mm, it tends to be difficult to increase the rigidity of the crown rear portion 4b, and the entire crown portion 4 may be greatly bent at the time of hitting. On the contrary, even if the protrusion height h of the crown rib 11 is too large, the weight of the crown rear portion 4b becomes excessively large, and this tends to increase the position of the head gravity center G. From such a viewpoint, the upper limit of the protrusion height h of the crown rib 11 is 3.0 mm or less, more preferably 1.5 mm or less in combination with any one of the lower limit values. This height h may be constant or may vary.

またクラウンリブ１１の幅Ｗも、特に制限はないが、好ましくは０．７mm以上、より好ましくは１．０mm以上が望ましい。前記幅Ｗが０．７mm未満であると、クラウン後部４ｂの剛性を高めることが困難な傾向にあり、打球時にクラウン部４の全体が大きく撓んでしまうおそれがある。逆にクラウンリブ１１の幅Ｗが大きすぎてもクラウン後部４ｂの重量が過度に大きくなり、ヘッド重心Ｇの位置を高くする傾向がある好ましくない。このような観点より、クラウンリブ１１の幅Ｗの上限は、前記下限値のいずれかとの組み合わせにおいて３．０mm以下、より好ましくは２．０mm以下が望ましい。   The width W of the crown rib 11 is not particularly limited, but is preferably 0.7 mm or more, more preferably 1.0 mm or more. If the width W is less than 0.7 mm, it tends to be difficult to increase the rigidity of the crown rear portion 4b, and the entire crown portion 4 may be greatly bent at the time of hitting. On the contrary, even if the width W of the crown rib 11 is too large, the weight of the crown rear portion 4b becomes excessively large, and this tends to increase the position of the center of gravity G of the head. From such a viewpoint, the upper limit of the width W of the crown rib 11 is 3.0 mm or less, more preferably 2.0 mm or less, in combination with any one of the lower limit values.

さらに上記と同様の観点より、クラウンリブ１１の横断面積Ｓは、好ましくは０．２mm2 以上、より好ましくは０．５mm2 以上が望ましく、同上限については、前記下限値のいずれかとの組み合わせにおいて、４．０mm2 以下、より好ましくは２．０mm2 以下が望ましい。さらに複数本のクラウンリブ１１において、隣り合うクラウンリブ１１、１１の間隔ｄは、好ましくは５mm以上、より好ましくは７mm以上が望ましく、同上限については、前記下限値のいずれかとの組み合わせにおいて３０mm以下、より好ましくは２０mm以下が望ましい。 Further, from the same viewpoint as described above, the cross-sectional area S of the crown rib 11 is preferably 0.2 mm 2 or more, more preferably 0.5 mm 2 or more. For the same upper limit, in combination with any of the above lower limit values It is desirably 4.0 mm 2 or less, more preferably 2.0 mm 2 or less. Further, in the plurality of crown ribs 11, the distance d between the adjacent crown ribs 11, 11 is preferably 5 mm or more, more preferably 7 mm or more, and the upper limit is 30 mm or less in combination with any one of the lower limit values. More preferably, it is 20 mm or less.

またクラウン部４におけるクラウンリブ１１以外の部分の厚さｔｃとしては、例えば０．５mm以上、より好ましくは０．７mm以上が好適であり、また２．０mm以下、より好ましくは１．５mm以下が望ましい。２．０mm以上であると、クラウン前部４ａの剛性を過度に高める傾向があり、逆に０．５mm未満であると、クラウン部４の強度が不足しやすく、耐久性に劣る傾向がある。   In addition, the thickness tc of the crown portion 4 other than the crown rib 11 is, for example, 0.5 mm or more, more preferably 0.7 mm or more, and 2.0 mm or less, more preferably 1.5 mm or less. desirable. If it is 2.0 mm or more, the rigidity of the crown front portion 4a tends to be excessively increased. Conversely, if it is less than 0.5 mm, the strength of the crown portion 4 tends to be insufficient and durability tends to be poor.

またこの実施形態では、クラウン部４と同様、ソール前部４ａの剛性をソール後部５ｂの剛性よりも小さくするために、ソール後部５ｂの内面側にヘッド前後方向にのびる１ないし複数本（この例では複数本）の突状のソールリブ１２が設けられたものを示す。ソール部５は、ソールリブ１２以外の部分については、実質的に一定の厚さで形成されており、ソール前部５ａにはソールリブ１２は設けられていない。従って、ソールリブ１２が設けられていないソール前部５ａの剛性は、ソール後部５ｂの剛性よりも小さくなる。このソールリブ１２についてもクラウンリブ１１と同様の規定が適用できる。   In this embodiment, similarly to the crown portion 4, in order to make the rigidity of the sole front portion 4a smaller than the rigidity of the sole rear portion 5b, one or a plurality (in this example) extends in the front-rear direction of the head on the inner surface side of the sole rear portion 5b. Fig. 5 shows a structure in which a plurality of protruding sole ribs 12 are provided. The portion of the sole portion 5 other than the sole rib 12 is formed with a substantially constant thickness, and no sole rib 12 is provided on the sole front portion 5a. Therefore, the rigidity of the sole front part 5a where the sole rib 12 is not provided is smaller than the rigidity of the sole rear part 5b. The same rules as the crown rib 11 can be applied to the sole rib 12.

本実施形態のヘッド１は、各種の材料、例えばチタン合金、ステンレス、アルミニウム合金などによって形成することができ、製法についても特に限定されることはない。また、より効果的な飛距離増大効果を得るためには、ヘッド体積を３００cm3 以上、さらに好ましくは３２０cm3 以上とするのが特に望ましい。 The head 1 of the present embodiment can be formed of various materials such as titanium alloy, stainless steel, aluminum alloy, and the manufacturing method is not particularly limited. Further, in order to obtain a more effective distance increase effect, the head volume 300 cm 3 or more, more preferably particularly desirable that the 320 cm 3 or more.

以上、本発明の実施形態について詳述したが、本発明は上記実施形態に限定されることなく種々の変形が可能である。例えば、クラウン前部４ａからクラウン後部４ｂに向かって厚さが漸増するものや、クラウン前部４ａと後部４ｂとで材料を異ならせるもの、さらにはクラウン後部４ｂにはリブのような長さのない突部などを間欠的に設けることもできる。   As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, the thickness is gradually increased from the crown front portion 4a toward the crown rear portion 4b, the crown front portion 4a and the rear portion 4b are made of different materials, and the crown rear portion 4b has a length like a rib. It is also possible to intermittently provide no protrusions.

表１の仕様に基づいてヘッド体積４００cm3 、ヘッド質量２００ｇ、リアルロフト角１０度のウッド型のゴルフクラブヘッド（＃１）を試作し、各種のテストを行って性能を比較した。フェース部には、ＤＡＴ５５Ｇ（Ｔｉ−１５Ｖ−６Ｃｒ−４Ａｌ）の圧延材を使用し厚さは均一とした。またヘッド本体にはＴｉ−６Ａｌー４Ｖの鋳造品を使用し、フェース部材に溶接で一体化した。
テスト方法は、次の通りである。 Based on the specifications in Table 1, a wood-type golf club head (# 1) having a head volume of 400 cm 3 , a head mass of 200 g, and a real loft angle of 10 degrees was prototyped, and various tests were performed to compare the performance. For the face part, a rolled material of DAT55G (Ti-15V-6Cr-4Al) was used, and the thickness was made uniform. In addition, a casting of Ti-6Al-4V was used for the head body, and it was integrated with the face member by welding.
The test method is as follows.

＜反発係数＞
Ｕ．Ｓ．Ｇ．Ａ．の Procedure for Measureing the Velocity Ratio of a Club Head for Conformance to Rule 4-1e, Revision 2 (February 8, 1999) に基づき行ったが、テストボールに関しては、次の４種類で行った。数値が大きいほど良好である。
１．ＸＸＩＯ：ＳＲＩスポーツ社製（２００３年製造）
２．ＨＩ−ＢＲＩＤ ＥＶＥＲＩＯ：ＳＲＩスポーツ社製（２００３年製造）
３．ＸＸＩＯ：住友ゴム工業社製（２００１年製造）
４．ＤＤＨ ＸＡＭＸＡ ＬＡＤＩＥＳ：ＳＲＩスポーツ社製（２００３年製造） <Restitution coefficient>
U. S. G. A. The test ball was based on the following four types of test balls, although it was based on the Procedure for Measureing the Velocity Ratio of a Club Head for Conformance to Rule 4-1e, Revision 2 (February 8, 1999). The larger the value, the better.
1. XXIO: manufactured by SRI Sports (manufactured in 2003)
2. HI-BRID EVERIO: manufactured by SRI Sports (manufactured in 2003)
3. XXIO: manufactured by Sumitomo Rubber Industries, Ltd. (produced in 2001)
4). DDH XAMXA LADIES: manufactured by SRI Sports (manufactured in 2003)

＜マシンテスト＞
各供試ヘッドに同一のカーボン樹脂シャフト（ＳＲＩスポーツ社製 ＭＰ−２００、２００３年製造）を装着して全長４５インチのウッド型のゴルフクラブが試作された。そして各供試クラブを、スイングロボットに取り付けてヘッドスピード４５ｍ／ｓで上記４種類のゴルフボールをそれぞれスイートスポットで１０球づつ打撃し、飛距離（キャリー＋ラン）とバックスピン量を測定した。評価は、いずれも平均値で示す。 <Machine test>
A wood-type golf club having a total length of 45 inches was manufactured by mounting the same carbon resin shaft (MP-200 manufactured by SRI Sports, manufactured in 2003) on each test head. Each of the test clubs was attached to a swing robot, and the above four types of golf balls were hit with 10 sweet balls each at a head speed of 45 m / s, and the flight distance (carry + run) and the backspin amount were measured. All evaluations are shown as average values.

＜ヘッドの周波数伝達関数の１次の極小値を示す周波数＞
加振法によって測定する。具体的な手順は次の通りとする。
（１）図１２、図１３に示すように、ヘッド１のフェース面ＦのスイートスポットＳＳに加振機１３の加振部材１２（外径１０mmの円筒状）を接着剤で固着する。
（２）図１３のように加速度ピックアップＰａ２を、ヘッド１の振動が測定できるフェース面ＦのスイートスポットＳＳからトウ側に２０mmの位置に接着剤で固着する。
（３）図１２のように、加振機１３がヘッドを加振するときの加振点の加速度を測定する加速度ピックアップＰａ１を入力治具１５に取付ける。
（４）図１４に示すように、加振機１３でヘッド１に振動を与え、入力治具１５の加速度α１の信号およびヘッド１側の加速度α２の信号をパワーユニットを介してＦＦＴアナライザに取り込む。
（５）ＦＦＴアナライザで周波数伝達関数を（α１のパワースペクトル／α２のパワースペクトル）にて求める。
（６）図１５は、周波数伝達関数の測定結果を示す。このようなグラフからヘッドを加振機に固着して加振法により測定されたヘッドの周波数伝達関数の一次の極小値を示す周波数ｆ（複数の極小値を示す周波数のうち最も小さい周波数）を読取る。テストの結果などを表１に示す。 <Frequency showing the first-order minimum value of the head frequency transfer function>
Measure by vibration method. The specific procedure is as follows.
(1) As shown in FIGS. 12 and 13, the vibration member 12 (cylindrical shape having an outer diameter of 10 mm) of the vibration exciter 13 is fixed to the sweet spot SS on the face surface F of the head 1 with an adhesive.
(2) As shown in FIG. 13, the acceleration pickup Pa2 is fixed with an adhesive at a position 20 mm from the sweet spot SS on the face surface F where the vibration of the head 1 can be measured to the toe side.
(3) As shown in FIG. 12, an acceleration pickup Pa <b> 1 that measures the acceleration at the excitation point when the vibrator 13 vibrates the head is attached to the input jig 15.
(4) As shown in FIG. 14, the vibration is applied to the head 1 by the vibrator 13, and the signal of the acceleration α1 of the input jig 15 and the signal of the acceleration α2 on the head 1 side are taken into the FFT analyzer via the power unit.
(5) The frequency transfer function is obtained by (a power spectrum of α1 / power spectrum of α2) with an FFT analyzer.
(6) FIG. 15 shows the measurement result of the frequency transfer function. From this graph, the frequency f (the lowest frequency among the frequencies indicating a plurality of minimum values) indicating the first-order minimum value of the frequency transfer function of the head measured by the vibration method with the head fixed to the shaker. Read. Table 1 shows the test results.

Figure 2005137788
Figure 2005137788
Figure 2005137788
Figure 2005137788

テストの結果、実施例のヘッドは、比較例のヘッドに比べて有意に飛距離を増大していることが確認できる。またこの結果はゴルフボールの種類を問わす奏される。さらに、種々のボールに対してバックスピン量が安定するため（バラツキが３００ｒｐｍ以下）、打球の飛行高さがほぼ一定となり、安定した飛距離が得られる。   As a result of the test, it can be confirmed that the head of the example significantly increased the flight distance compared to the head of the comparative example. This result is played regardless of the type of golf ball. Further, since the backspin amount is stable with respect to various balls (variation is 300 rpm or less), the flying height of the hit ball is almost constant, and a stable flight distance can be obtained.

本実施形態のゴルフクラブヘッドの全体斜視図である。1 is an overall perspective view of a golf club head of an embodiment. その平面図である。FIG. そのＡ−Ａ端面図である。It is the AA end elevation. 図３のＹ部拡大図である。It is the Y section enlarged view of FIG. ヘッドの斜視図である。It is a perspective view of a head. ヘッドの打球時の状態を示す側面図である。It is a side view which shows the state at the time of hitting of a head. ヘッドの打球時の状態を示す側面図である。It is a side view which shows the state at the time of hitting of a head. （Ａ）、（Ｂ）は本発明の他の実施形態を示すヘッドの断面図である。(A), (B) is sectional drawing of the head which shows other embodiment of this invention. 本発明の他の実施形態を示すヘッドの分解斜視図である。It is a disassembled perspective view of the head which shows other embodiment of this invention. その平面図である。FIG. （Ａ）はその断面図、（Ｂ）はそのＣ−Ｃ断面図である。(A) is the sectional view, and (B) is the CC sectional view. 加振法の測定方法を説明する側面図である。It is a side view explaining the measuring method of an excitation method. フェース面の正面図である。It is a front view of a face surface. 加振法を説明する全体ブロック図である。It is a whole block diagram explaining an excitation method. 周波数伝達関数を示すグラフである。It is a graph which shows a frequency transfer function.

符号の説明Explanation of symbols

１ ゴルフクラブヘッド
２ フェース部
３ ヘッド本体部
４ クラウン部
４ａ クラウン前部
４ｂ クラウン後部
５ ソール部
５ａ ソール前部
５ｂ ソール後部
６ サイド部
７ クラウンリブ
８ ソールリブ
Ｌｃ クラウン奥行き長さ
Ｌｃａ クラウン部の前方領域
Ｌｃｂ クラウン部の後方領域
Ｌｓ ソール奥行き長さ
Ｌｓａ ソール部の前方領域
Ｌｓｂ ソール部の後方領域 DESCRIPTION OF SYMBOLS 1 Golf club head 2 Face part 3 Head main-body part 4 Crown part 4a Crown front part 4b Crown rear part 5 Sole part 5a Sole front part 5b Sole rear part 6 Side part 7 Crown rib 8 Sole rib Lc Crown depth length Lca The front area | region of a crown part Lcb Crown area rear area Ls Sole depth length Lsa Sole area front area Lsb Sole area rear area

Claims (7)

ボールを打球するフェース面を有するフェース部と、このフェース部の背面に連なりヘッド後方にのびるヘッド本体部とを有し、
かつ、ヘッド本体部は、ヘッド上部、ヘッド底部及びヘッド側部をそれぞれ形成するクラウン部、ソール部及びサイド部を含む中空構造のゴルフクラブヘッドであって、
前記クラウン部は、前記背面からクラウン奥行き長さＬｃの０．１５倍の距離を隔てる位置までの前方領域をなすクラウン前部と、前記背面からクラウン奥行き長さＬｃの０．３０倍以上かつ１．０倍の後方領域をなすクラウン後部とを含み、かつ、クラウン前部は前記クラウン後部よりも小さい剛性を有することを特徴とするゴルフクラブヘッド。 A face portion having a face surface for hitting a ball, and a head main body portion extending to the back of the head connected to the back surface of the face portion;
And the head body is a golf club head having a hollow structure including a crown part, a sole part and a side part that respectively form a head upper part, a head bottom part and a head side part,
The crown portion includes a crown front portion that forms a front region from the back surface to a position that is separated by a distance 0.15 times the crown depth length Lc, and 0.30 times the crown depth length Lc from the back surface and 1 A golf club head comprising: a crown rear portion forming a rear region of 0.0 times, and the crown front portion having a rigidity smaller than that of the crown rear portion. 前記ソール部は、前記背面からソール奥行き長さＬｓの０．１５倍の距離を隔てる位置までの前方領域をなすソール前部と、前記背面からソール奥行き長さＬｓの０．３０倍以上かつ１．０倍の後方領域をなすソール後部とを含み、かつ、前記ソール前部は前記ソール後部よりも小さい剛性を有することを特徴とする請求項１記載のゴルフクラブヘッド。   The sole portion includes a sole front portion that forms a front region from the back surface to a position that is separated by a distance 0.15 times the sole depth length Ls, and 0.30 times the sole depth length Ls from the back surface, and 1 The golf club head according to claim 1, further comprising: a rear portion of the sole that forms a rear region of 0.0 times, and the front portion of the sole has rigidity smaller than that of the rear portion of the sole. 前記クラウン部は、前記クラウン前部の平均厚さｔｃ１が、前記クラウン後部の平均厚さｔｃ２よりも小さいことを特徴とする請求項１又は２に記載のゴルフクラブヘッド。   3. The golf club head according to claim 1, wherein the crown portion has an average thickness tc <b> 1 of the crown front portion smaller than an average thickness tc <b> 2 of the crown rear portion. 前記クラウン後部は、その内面側にヘッド前後方向にのびる１ないし複数本の突状のクラウンリブが設けられ、前記クラウン前部は該クラウンリブが設けられていないことを特徴とする請求項１記載のゴルフクラブヘッド。   2. The crown rear portion is provided with one or more projecting crown ribs extending in the front-rear direction of the head on the inner surface thereof, and the crown front portion is not provided with the crown rib. Golf club head. ボールを打球するフェース面を有するフェース部と、このフェース部の背面に連なりヘッド後方にのびるヘッド本体部とを有し、
かつ、ヘッド本体部は、ヘッド上部、ヘッド底部及びヘッド側部をそれぞれ形成するクラウン部、ソール部及びサイド部を含む中空構造のゴルフクラブヘッドであって、
前記ソール部は、前記背面からソール奥行き長さＬｓの０．１５倍の距離を隔てる位置までの前方領域をなすソール前部と、前記背面からソール奥行き長さＬｓの０．３０倍以上かつ１．０倍の後方領域をなすソール後部とを含み、
かつ、前記ソール前部は前記ソール後部よりも小さい剛性を有することを特徴とするゴルフクラブヘッド。 A face portion having a face surface for hitting a ball, and a head main body portion extending to the back of the head connected to the back surface of the face portion;
And the head body is a golf club head having a hollow structure including a crown part, a sole part and a side part that respectively form a head upper part, a head bottom part and a head side part,
The sole portion includes a sole front portion that forms a front region from the back surface to a position that is separated by a distance of 0.15 times the sole depth length Ls, and 0.30 times or more of the sole depth length Ls from the back surface and 1 A rear portion of the sole that forms a rear region of 0.times.
The golf club head is characterized in that the front portion of the sole has a rigidity smaller than that of the rear portion of the sole. 前記ソール部は、前記ソール前部の平均厚さｔｓ１が、前記ソール後部の平均厚さｔｓ２よりも小さいことを特徴とする請求項５に記載のゴルフクラブヘッド。   6. The golf club head according to claim 5, wherein the sole portion has an average thickness ts1 of the front portion of the sole that is smaller than an average thickness ts2 of the rear portion of the sole. 前記ソール後部は、その内面側にヘッド前後方向にのびる１ないし複数本の突状のソールリブが設けられ、前記ソール前部は該ソールリブが設けられていないことを特徴とする請求項５に記載のゴルフクラブヘッド。   6. The sole rear portion is provided with one or more protruding sole ribs extending in the front-rear direction of the head on an inner surface side thereof, and the sole front portion is not provided with the sole rib. Golf club head.
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