TWI697345B

TWI697345B - Wood type golf club head

Info

Publication number: TWI697345B
Application number: TW108109533A
Authority: TW
Inventors: 田嶋良平
Original assignee: 日商山葉股份有限公司
Priority date: 2018-03-20
Filing date: 2019-03-20
Publication date: 2020-07-01
Also published as: KR102174579B1; JP2019162322A; KR20190110441A; CN110302509A; JP6717332B2; CN110302509B; TW201940210A

Abstract

本發明之課題在於提供一種飛行距離較大且方向穩定性優異之木桿型高爾夫球桿頭。本發明之一態樣之木桿型高爾夫球桿頭係重心距離為45 mm以上50 mm以下，自桿身中心軸至最背面之前後方向距離為110 mm以上，且距離桿身中心軸80 mm以上後方之區域之質量為全體之質量20%以上。The subject of the present invention is to provide a wood-type golf club head with a large flying distance and excellent directional stability. The wood-type golf club head of one aspect of the present invention has a center of gravity distance of 45 mm or more and 50 mm or less, a distance of 110 mm or more in the front and back direction from the shaft center axis to the backmost, and a distance of 80 mm from the shaft center axis The mass of the area behind the above is more than 20% of the total mass.

Description

木桿型高爾夫球桿頭Wood golf club head

本發明係關於木桿型高爾夫球桿頭。The present invention relates to wood-type golf club heads.

現在，作為木桿型高爾夫球桿頭，一般使用中空金屬製者。於各種球桿中，對於木桿型高爾夫球桿頭，尤其期望飛行距離較大。Now, as a wood-type golf club head, a hollow metal one is generally used. Among various clubs, wood-type golf club heads are particularly expected to fly longer.

為了增大高爾夫球桿之飛行距離，增大桿頭速度是為有效方法。為了增大高爾夫球桿之桿頭速度，已知使桿身輕量化或增長桿身較為有效。In order to increase the flying distance of the golf club, increasing the head speed is an effective method. In order to increase the head speed of a golf club, it is known that it is effective to lighten the shaft or lengthen the shaft.

另一方面，對於木桿型高爾夫球桿，除了飛行距離較大，還期望方向穩定性優異。尤其是業餘高爾夫球手，對於木桿型高爾夫球桿要求在即使打歪時彎曲亦較小。On the other hand, for wood-type golf clubs, in addition to a large flying distance, excellent directional stability is also desired. Especially for amateur golfers, wood-type golf clubs are required to bend less even when they are played crookedly.

然而，若使桿身輕量化或增長桿身，則會產生高爾夫球桿之操作、即揮桿變難，且方向穩定性變差之問題。However, if the shaft is reduced in weight or lengthened, the operation of the golf club, that is, the swing becomes difficult, and the directional stability deteriorates.

一般而言，作為既增大飛行距離又提高方向穩定性之方法，較為有效的是增大高爾夫球桿頭之慣性力矩。例如，於日本專利第5519439號公報、日本專利第5918196號公報及日本專利第5996573號公報中，提案一種木桿型高爾夫球桿頭，其增大了繞鉛直軸之慣性力矩。Generally speaking, as a method for increasing the flying distance and improving the directional stability, it is more effective to increase the moment of inertia of the golf club head. For example, in Japanese Patent No. 5519439, Japanese Patent No. 5918196, and Japanese Patent No. 5996573, a wood-type golf club head is proposed that increases the moment of inertia around a vertical axis.

即使提供了此種經改良之木桿型高爾夫球桿頭，高爾夫球手仍不滿足，而持續期望飛行距離更大，方向穩定性更優異之木桿型高爾夫球桿。 [先前技術文獻] [專利文獻]Even if such an improved wood-type golf club head is provided, golfers are still not satisfied, and continue to desire a wood-type golf club with greater flying distance and better directional stability. [Prior Technical Literature] [Patent Literature]

[專利文獻1]日本專利第5519439號公報 [專利文獻2]日本專利第5918196號公報 [專利文獻3]日本專利第5996573號公報[Patent Document 1] Japanese Patent No. 5519439 [Patent Document 2] Japanese Patent No. 5918196 [Patent Document 3] Japanese Patent No. 5996573

[發明所欲解決之問題][The problem to be solved by the invention]

本發明之課題在於提供一種飛行距離大並且方向穩定性優異之木桿型高爾夫球桿。 [解決問題之技術手段]The subject of the present invention is to provide a wood-type golf club with a large flying distance and excellent directional stability. [Technical means to solve the problem]

為了解決上述問題而完成之本發明之一態樣之木桿型高爾夫球桿頭係重心距離在45 mm以上50 mm以下，自桿身中心軸至最背面之前後方向距離為110 mm以上，且距離桿身中心軸80 mm以上之後方之區域之質量為全體之質量20%以上。The wood-type golf club head of one aspect of the present invention completed in order to solve the above-mentioned problems has a center of gravity distance of 45 mm or more and 50 mm or less, and a distance of 110 mm or more in the front and back direction from the shaft center axis to the backmost, and The mass of the area beyond 80 mm from the shaft center axis is more than 20% of the total mass.

於該木桿型高爾夫球桿頭中，較佳為繞通過重心之趾部及跟部(toe heel)方向上之軸的慣性力矩為3600 gcm² 以上5000 gcm² 以下，且繞通過重心之鉛直軸之慣性力矩為5500 gcm² 以上5900 gcm² 以下。In the wood-type golf club head, it is preferable that the moment of inertia around the axis in the direction of the toe and the toe heel passing through the center of gravity is 3600 gcm ² or more and 5000 gcm ² or less, and the moment of inertia around the axis passing through the center of gravity is preferably The moment of inertia of the shaft is 5500 gcm ² or more and 5900 gcm ² or less.

於該木桿型高爾夫球桿頭中，較佳為重心高度為桿頭高度之38%以上43%以下。In the wood-type golf club head, it is preferable that the height of the center of gravity is 38% to 43% of the head height.

於該木桿型高爾夫球桿頭中，較佳為體積450 cm³ 以上且於前視下外緣之自桿身中心軸朝跟部側之突出距離為8 mm以下。In the wood-type golf club head, it is preferable that the volume is 450 cm ³ or more and the protrusion distance of the outer edge from the shaft center axis toward the heel side in front view is 8 mm or less.

於該木桿型高爾夫球桿頭中，較佳為於前視下自桿身中心軸至跟部之距離為7 mm以下。In the wood-type golf club head, the distance from the shaft center axis to the heel is preferably 7 mm or less in front view.

於該木桿型高爾夫球桿頭中，較佳為自桿身中心軸至重心之前後方向距離為25 mm以上45 mm以下。In the wood-type golf club head, it is preferable that the distance from the shaft center axis to the center of gravity is 25 mm or more and 45 mm or less.

於該木桿型高爾夫球桿頭中，較佳為自跟部至趾部之水平長度為120 mm以上。In the wood-type golf club head, it is preferable that the horizontal length from the heel to the toe is 120 mm or more.

另，該木桿型高爾夫球桿頭之各尺寸係於配置成球桿頭與桿身角度(lie)(桿身中心軸相對於水平面之角度)為60°之狀態下測定。「重心距離」意指自將重心垂直投影至桿面之點(桿面重心點)至桿身中心軸之垂直距離。「前後方向」意指垂直於包含桿身中心軸之鉛直面之方向。「趾部」意指前視之水平方向前端。「跟部」意指前視之外緣之距高爾夫球桿頭之最下點之垂直距離為22.23mm的桿身側之點。「趾部及跟部方向」意指與包含桿身中心軸之垂直面平行之水平方向。「重心高度」意指著自底部之最下點至重心之垂直距離。 [發明之效果]In addition, the dimensions of the wood-type golf club head are measured in a state where the angle (lie) (the angle of the shaft center axis relative to the horizontal plane) of the club head and the shaft is 60°. The "center of gravity distance" refers to the vertical distance from the point where the center of gravity is projected vertically onto the face (the center of gravity point of the face) to the center axis of the shaft. The "front-rear direction" means the direction perpendicular to the vertical plane including the shaft center axis. "Toe" means the horizontal front end of the front view. "Heel" means the point on the side of the shaft where the vertical distance from the outer edge of the front view to the lowest point of the golf club head is 22.23mm. "Toe and heel direction" means the horizontal direction parallel to the vertical plane including the shaft center axis. "Height of the center of gravity" means the vertical distance from the lowest point of the bottom to the center of gravity. [Effects of Invention]

本發明之木桿型高爾夫球桿頭由於重心距離較大，因而會因擊球時因該木桿型高爾夫球桿頭繞桿身中心軸旋動之離心力而增大飛行距離，且由於前後方向距離較大，後方區域之質量較大，從而繞垂直軸之慣性力矩特別大，故方向穩定性優異。Since the wood-type golf club head of the present invention has a large center of gravity distance, it will increase the flying distance due to the centrifugal force of the wood-type golf club head rotating around the shaft center axis when hitting the ball. The greater the distance, the greater the mass in the rear area, the greater the moment of inertia around the vertical axis, and the excellent directional stability.

以下，一邊適當參照圖式一邊說明本發明之實施形態。Hereinafter, the embodiments of the present invention will be described with appropriate reference to the drawings.

[木桿型高爾夫球桿頭] 於圖1至圖3，顯示本發明之一實施形態之木桿型高爾夫球桿頭。該木桿型高爾夫球桿頭為1號木桿用高爾夫球桿頭。[Wooden golf club head] 1 to 3 show a wood-type golf club head according to an embodiment of the present invention. The wood-type golf club head is a golf club head for a driver.

該木桿型高爾夫球桿頭具備桿面(打球面)1、底部(底面)2、頂部(頂面)3、具有供未圖示之桿身***固定之桿身孔4之插鞘5。The wood-type golf club head includes a face (playing face) 1, a bottom (bottom) 2, a top (top) 3, and a hosel 5 with a shaft hole 4 for inserting and fixing a shaft not shown.

作為該木桿型高爾夫球桿頭之材質，可列舉例如不鏽鋼、鈦合金、鋁合金、鎢等。又，該木桿型高爾夫球桿頭亦可一部分由不同之材質形成。Examples of the material of the wood-type golf club head include stainless steel, titanium alloy, aluminum alloy, and tungsten. In addition, the wood-type golf club head may be partially formed of different materials.

另，圖1係顯示球桿頭與桿身角度配置為60°，即包含桿身孔4之中心線即桿身中心軸C之鉛直面之桿身中心軸C相對於之水平方向之傾斜角度配置為60°之情形之該木桿型高爾夫球桿頭之正面(桿面1側之面)，圖2係顯示球桿頭與桿身角度配置為60°之情形之該木桿型高爾夫球桿頭之平面(頂部3側之面)，圖3係顯示包含該木桿型高爾夫球桿頭之重心之前後方向之鉛直剖面，即圖1之X-X線剖面。In addition, Fig. 1 shows that the angle of the club head and the shaft is configured to be 60°, that is, the inclination angle of the shaft center axis C relative to the horizontal direction including the center line of the shaft hole 4, which is the vertical plane of the shaft center axis C. The front side of the wood-type golf club head (face 1 side) when the configuration is 60°. Figure 2 shows the wood-type golf club when the angle between the club head and shaft is 60°. The plane of the club head (the surface on the top 3 sides), Fig. 3 shows a vertical section including the center of gravity of the wood-type golf club head in the front and rear directions, that is, the XX line section in Fig. 1.

＜全體形狀＞<Overall shape>

於該木桿型高爾夫球桿頭中，作為自跟部Ph至趾部Pt之水平長度(桿頭長)Lw之下限，較佳為120 mm，更佳為125 mm。另一方面，作為自跟部Ph至趾部Pt之水平長度Lw之上限，較佳為127 mm。於自跟部Ph至趾部Pt之水平長度Lw未達上述下限之情形時，擊球時因該木桿型高爾夫球桿頭繞桿身軸之旋動使得賦予至球之能量變小故而有無法充分提高飛行距離之虞。相反，於自跟部Ph至趾部Pt之水平長度Lw超過上述上限之情形時，於現在之規則下無法在正式競技中使用。In the wood-type golf club head, the lower limit of the horizontal length (head length) Lw from the heel Ph to the toe Pt is preferably 120 mm, more preferably 125 mm. On the other hand, the upper limit of the horizontal length Lw from the heel Ph to the toe Pt is preferably 127 mm. When the horizontal length Lw from the heel Ph to the toe Pt does not reach the above lower limit, when hitting the ball, the rotation of the wood-type golf club head around the shaft axis reduces the energy imparted to the ball. It may not be able to sufficiently increase the flight distance. On the contrary, when the horizontal length Lw from the heel Ph to the toe Pt exceeds the above upper limit, it cannot be used in official competitions under the current rules.

該木桿型高爾夫球桿頭之前後方向之長度(桿頭寬度)Dw較佳為小於自跟部Ph至趾部Pt之水平長度Lw。作為該前後方向之長度Dw之下限，較佳為120 mm，更佳為125 mm。另一方面，作為前後方向之長度Dw之上限，較佳為127 mm。於前後方向之長度未達上述下限之情形時，由於無法增大該木桿型高爾夫球桿頭之繞鉛直軸之慣性力矩，故有打球之方向穩定性不充分之虞。相反，於前後方向之長度Dw超過上述上限之情形時，於現在之規則下無法於正式競技中使用。The front and rear length (head width) Dw of the wood-type golf club head is preferably less than the horizontal length Lw from the heel Ph to the toe Pt. The lower limit of the length Dw in the front-rear direction is preferably 120 mm, and more preferably 125 mm. On the other hand, the upper limit of the length Dw in the front-rear direction is preferably 127 mm. When the length in the front-rear direction does not reach the above lower limit, since the moment of inertia of the wood-type golf club head around the vertical axis cannot be increased, the directional stability of the ball may be insufficient. On the contrary, when the length Dw in the front-rear direction exceeds the above upper limit, it cannot be used in official competitions under the current rules.

於該木桿型高爾夫球桿頭中，作為自桿身中心軸C至最背面(後端點Pr)之前後方向距離Dc之下限，為110 mm，較佳為112 mm，更佳為114 mm。另一方面，作為自桿身中心軸C至最背面之前後方向距離Dc之上限，較佳為120 mm，更佳為117 mm。於自桿身中心軸C至最背面之前後方向距離Dc未達上述下限之情形時，由於無法增大該木桿型高爾夫球桿頭繞鉛直軸之慣性力矩，故有打球之方向穩定性不充分之虞。相反，於自桿身中心軸C至最背面之前後方向距離Dc超過上述上限之情形時，有前後方向之長度過大之虞或難以於桿面1形成必要之打球線對打球面之角度(lofe)之虞。In the wood-type golf club head, the lower limit of the distance Dc in the front and rear direction from the shaft center axis C to the backmost surface (rear end point Pr) is 110 mm, preferably 112 mm, and more preferably 114 mm . On the other hand, as the upper limit of the distance Dc in the front and rear direction from the shaft center axis C to the backmost surface, it is preferably 120 mm, and more preferably 117 mm. When the distance Dc in the front and rear direction from the shaft center axis C to the backmost side does not reach the above-mentioned lower limit, since the inertia moment of the wood-type golf club head around the vertical axis cannot be increased, the directional stability of the ball may be unstable Full of fear. On the contrary, when the distance Dc from the shaft center axis C to the backmost back in the front and rear direction exceeds the above upper limit, the length in the front and rear direction may be too large or it may be difficult to form the necessary angle between the line of play and the surface (lofe ) Is about.

作為該木桿型高爾夫球桿頭之體積之下限，較佳為450 cm³ ，更佳為460 cm³ 。另一方面，作為該木桿型高爾夫球桿頭之體積之上限，較佳為470 cm³ 。於該木桿型高爾夫球桿頭之體積未達上述下限之情形時，由於無法充分地增大該木桿型高爾夫球桿頭之慣性力矩，故有打球之方向穩定性不充分之虞。相反，於該木桿型高爾夫球桿頭之體積超過上述上限之情形時，於現在之規則下無法在正式競技中使用。The lower limit of the volume of the wood-type golf club head is preferably 450 cm ³ , and more preferably 460 cm ³ . On the other hand, as the upper limit of the volume of the wood-type golf club head, it is preferably 470 cm ³ . When the volume of the wood-type golf club head does not reach the aforementioned lower limit, since the moment of inertia of the wood-type golf club head cannot be increased sufficiently, the directional stability of the ball may be insufficient. On the contrary, when the volume of the wood-type golf club head exceeds the above upper limit, it cannot be used in official competitions under the current rules.

作為該木桿型高爾夫球桿頭之重心高度(重心G與底部2之最下點Pb之鉛直方向距離)Hg之下限，較佳為桿頭高度(頂部3之頂點Pc與底部2之最下點Pb之鉛直方向距離)Hw之38%，更佳為40%。另一方面，作為重心高度Hg之上限，較佳為桿頭高度Hw之43%，更佳為42%。若重心高度Hg未達上述下限，則必須對底部2配置多餘之重量，且有高爾夫球桿不容易正確揮桿之虞。反之，若重心高度Hg超過上述上限，由於桿面重心點Ps、亦即能夠效率良好地將運動能量傳遞至球之最佳打擊點之位置變高，故有難以操縱高爾夫球桿之虞。As the lower limit of the height of the center of gravity of the wood-type golf club head (the vertical distance between the center of gravity G and the lowest point Pb of the bottom 2) Hg, the height of the head (the apex Pc of the top 3 and the bottom 2 of the bottom 2) The vertical distance from point Pb) is 38% of Hw, and more preferably 40%. On the other hand, as the upper limit of the center of gravity height Hg, 43% of the head height Hw is preferable, and 42% is more preferable. If the height of the center of gravity Hg does not reach the above lower limit, excess weight must be placed on the bottom 2 and it may be difficult for the golf club to swing correctly. Conversely, if the height of the center of gravity Hg exceeds the above upper limit, the face's center of gravity point Ps, that is, the position at which the kinetic energy can be efficiently transmitted to the best hitting point of the ball, becomes higher, making it difficult to manipulate the golf club.

於該木桿型高爾夫球桿頭中，作為頂部3與底部2之稜線(俯視外形線)之平均高度之下限，較佳為桿頭高度Hw之25%，更佳為30%。另一方面，作為頂部3與底部2之稜線之平均高度之上限，較佳為桿頭高度Hw之50%，更佳為40%。若頂部3與底部2之稜線之平均高度未達上述下限，會有底部2容易掃到地面或草坪之虞。反之，若頂部3與底部2之稜線之平均高度超過上述上限，則重心G之位置變得過高，為了降低重心G之位置而必須對底部2配置多餘之重量，因而該木桿型高爾夫球桿頭變重而有高爾夫球桿不易正確揮桿之虞。In the wood-type golf club head, as the lower limit of the average height of the ridge line (top view contour line) of the top 3 and the bottom 2 is preferably 25% of the head height Hw, more preferably 30%. On the other hand, the upper limit of the average height of the ridgeline of the top 3 and the bottom 2 is preferably 50% of the head height Hw, and more preferably 40%. If the average height of the ridgeline between the top 3 and the bottom 2 does not reach the above lower limit, the bottom 2 may easily sweep to the ground or lawn. Conversely, if the average height of the ridgeline between the top 3 and the bottom 2 exceeds the above upper limit, the position of the center of gravity G becomes too high. In order to reduce the position of the center of gravity G, excess weight must be placed on the bottom 2. Therefore, the wood golf ball The club head becomes heavier and the golf club may not be easy to swing correctly.

於該木桿型高爾夫球桿頭中，後端點(於頂部3與底部2之稜線上於前後方向最靠後方之點)Pr之高度之下限，較佳為桿頭高度Hw之12%，更佳為14%。另一方面，作為後端點Pr之高度之上限，較佳為桿頭高度Hw之20%，更佳為18%。若後端點Pr之高度未達上述下限，有底部容易掃到地面或草坪之虞。反之，若後端點Pr之高度超過上述上限，則重心G之位置變得過高，為了降低重心G之位置而必須對頂部2配置多餘重量，因而該木桿型高爾夫球桿頭變重而有高爾夫球桿不易正確揮桿之虞。In the wood-type golf club head, the lower limit of the height of the rear end point (the most rearward point in the front and rear direction on the ridgeline of the top 3 and the bottom 2) Pr is preferably 12% of the head height Hw, More preferably, it is 14%. On the other hand, as the upper limit of the height of the rear end point Pr, 20% of the head height Hw is more preferable, and 18% is more preferable. If the height of the rear end point Pr does not reach the above-mentioned lower limit, the bottom may be easily swept to the ground or lawn. Conversely, if the height of the rear end point Pr exceeds the above upper limit, the position of the center of gravity G becomes too high. In order to reduce the position of the center of gravity G, excess weight must be placed on the top part 2. Therefore, the wood-type golf club head becomes heavier. There is a risk that the golf club is not easy to swing correctly.

於該木桿型高爾夫球桿頭中，作為趾部之高度Ht之下限，較佳為桿頭高度Hw之40%，更佳為45%。另一方面，作為趾部之高度Ht之上限，較佳為桿頭高度Hw之50%，更佳為48%。若趾部高度Ht未達上述下限，會有底部容易掃到地面或草坪之虞。反之，若趾部之高度Ht超過上述上限，則重心G之位置變得過高，為了降低重心G之位置而必須對底部2配置多餘重量，因而該木桿型高爾夫球桿頭變重而有高爾夫球桿不易正確揮桿之虞。In the wood-type golf club head, as the lower limit of the toe height Ht, it is preferably 40% of the head height Hw, more preferably 45%. On the other hand, as the upper limit of the height Ht of the toe portion, it is preferably 50% of the head height Hw, and more preferably 48%. If the toe height Ht does not reach the above lower limit, the bottom may be easily swept to the ground or lawn. Conversely, if the height Ht of the toe exceeds the above upper limit, the position of the center of gravity G becomes too high. In order to reduce the position of the center of gravity G, excess weight must be placed on the sole 2. Therefore, the wood-type golf club head becomes heavier. The golf club is not easy to swing correctly.

作為自該木桿型高爾夫球桿頭之桿身中心軸C至重心G之前後方向距(以下，稱為軸重心深度)Dg之下限，較佳為25 mm，更佳為32 mm，進而更佳為35 mm。另一方面，作為軸重心深度Dg之上限，較佳為45 mm，更佳為38 mm。該木桿型高爾夫球桿頭藉由增大軸重心深度Dg，而容易在擊球時使桿面以正對打球方向之方式旋轉。若軸重心深度Dg未達上述下限，則不容易使該木桿型高爾夫球桿頭繞桿身中心軸C旋轉，且由於易在桿面開放之狀態下擊球，故有擊球容易旋球(slice)之虞。反之，若軸重心深度Dg超過上述上限，則該木桿型高爾夫球桿頭變得容易過度旋轉，且由於易在桿面關閉狀態下擊球，故有容易打出鈎球(hook)之虞。As the lower limit of Dg from the shaft center axis C to the center of gravity G of the wood-type golf club head (hereinafter referred to as the depth of the axial center of gravity), it is preferably 25 mm, more preferably 32 mm, and still more Preferably it is 35 mm. On the other hand, as the upper limit of the depth Dg of the shaft center of gravity, it is preferably 45 mm, and more preferably 38 mm. By increasing the depth Dg of the axial center of gravity of the wood-type golf club head, it is easy to rotate the face of the club face in the direction of the ball when hitting the ball. If the axial center of gravity depth Dg does not reach the above lower limit, it is not easy to rotate the wood-type golf club head around the shaft center axis C, and because it is easy to hit the ball with the club face open, it is easy to spin the ball when hitting (slice) the danger. Conversely, if the depth Dg of the axial center of gravity exceeds the above upper limit, the wood-type golf club head tends to spin excessively, and because it is easy to hit the ball with the face closed, there is a risk that a hook may be easily hit.

作為該木桿型高爾夫球桿頭之重心距離(桿面重心點Ps與桿身中心軸C之距離)Rs之下限，為45 mm，較佳為46 mm，更佳為47 mm。作為該該木桿型高爾夫球桿頭之重心距離Rs之上限，為50 mm，較佳為49 mm，更佳為48 mm。於重心距離Rs未達上述下限之情形時，有因繞桿身之旋轉力所致之飛行距離提高效果不充分之虞。相反，於重心距離Rs超過上述上限之情形時，有高爾夫球桿不易正確揮桿之虞。再者，由於重心距離Rs於圖中未與紙面平行，故附帶括弧而圖示。The lower limit of the center of gravity distance (the distance between the face center of gravity point Ps and the shaft center axis C) Rs of the wood-type golf club head is 45 mm, preferably 46 mm, and more preferably 47 mm. The upper limit of the center of gravity distance Rs of the wood-type golf club head is 50 mm, preferably 49 mm, and more preferably 48 mm. When the center of gravity distance Rs does not reach the above-mentioned lower limit, the effect of increasing the flying distance due to the rotational force around the shaft may be insufficient. On the contrary, when the center of gravity distance Rs exceeds the above upper limit, it may be difficult for the golf club to swing correctly. In addition, since the center of gravity distance Rs is not parallel to the paper surface in the figure, it is shown in parentheses.

作為該木桿型高爾夫球桿頭之質量下限，較佳為160 g，更佳為180 g。另一方面，作為該木桿型高爾夫球桿頭之質量上限，較佳為230g，更佳為210 g。於該木桿型高爾夫球桿頭之質量未達上述下限之情形時，有難以分配重量使重心G之位置適當化之虞。相反，於該木桿型高爾夫球桿頭之質量超過上述上限之情形時，有高爾夫球桿不容易正確揮桿之虞。The lower limit of the mass of the wood-type golf club head is preferably 160 g, and more preferably 180 g. On the other hand, as the upper limit of the mass of the wood-type golf club head, it is preferably 230 g, and more preferably 210 g. When the quality of the wood-type golf club head does not reach the above-mentioned lower limit, it may be difficult to distribute the weight to optimize the position of the center of gravity G. On the contrary, when the quality of the wood-type golf club head exceeds the above-mentioned upper limit, the golf club may not be easy to swing correctly.

該木桿型高爾夫球桿頭設為大致中空構造，但為了增大上述重心深度，較佳設為僅後端部形成實心之實心區域As。又，於該木桿型高爾夫球桿頭中，為了減低重心G之高度，實心區域As之前緣越於下方越靠前方之位置，較佳為實心區域As與中空區域之邊界面傾斜。This wood-type golf club head has a substantially hollow structure, but in order to increase the depth of the center of gravity, it is preferable to form a solid solid area As only at the rear end. In addition, in the wood-type golf club head, in order to reduce the height of the center of gravity G, the front edge of the solid area As is positioned farther down and forward, and the boundary surface between the solid area As and the hollow area is preferably inclined.

作為該木桿型高爾夫球桿頭之實心區域As與中空區域之邊界面相對於水平面之平均傾斜角度之下限，較佳為35°，更佳為40°。另一方面，作為實心區域As與中空區域之邊界面相對於水平面之平均傾斜角度之上限，較佳為55°，更佳為50°。於實心區域As與中空區域之邊界面相對於水平面之平均傾斜角度未達上述下限之情形時，有無法充分增大軸重心深度Dg之虞。相反，於實心區域As與中空區域之邊界面相對於水平面之平均傾斜角度超過上述上限之情形時，有重心G變得過高之虞。As the lower limit of the average inclination angle of the boundary surface between the solid area As and the hollow area of the wood-type golf club head with respect to the horizontal plane, it is preferably 35°, more preferably 40°. On the other hand, as the upper limit of the average inclination angle of the boundary surface between the solid area As and the hollow area with respect to the horizontal plane, it is preferably 55°, more preferably 50°. When the average inclination angle of the boundary surface between the solid area As and the hollow area with respect to the horizontal plane does not reach the above-mentioned lower limit, the depth Dg of the axial center of gravity may not be sufficiently increased. Conversely, when the average inclination angle of the boundary surface between the solid area As and the hollow area with respect to the horizontal plane exceeds the above upper limit, the center of gravity G may become too high.

於該木桿型高爾夫球桿頭中，作為自前視外緣之底部2至跟部Ph之最小曲率半徑之下限，較佳為30 mm，更佳為32 mm。另一方面，作為前視外緣之底部2至跟部Ph之區域之最小曲率半徑之上限，較佳為50 mm，更佳為40 mm。於自前視外緣之底部2至跟部Ph之區域之最小曲率半徑未達上述下限之情形時，有無法充分增大重心距離Rs之虞。相反，於自前視外緣之底部2至跟部Ph之區域之最小曲率半徑超過上述上限之情形時，則有因桿面1變小而偏離最佳打擊點之情形時飛行距離下降或彎曲變大之虞。In this wood-type golf club head, the lower limit of the minimum radius of curvature from the bottom 2 of the front outer edge to the heel Ph is preferably 30 mm, more preferably 32 mm. On the other hand, as the upper limit of the minimum radius of curvature of the area from the bottom 2 to the heel Ph of the outer edge of the front view, it is preferably 50 mm, more preferably 40 mm. When the minimum radius of curvature of the region from the bottom 2 of the front outer edge to the heel Ph does not reach the above lower limit, the center of gravity distance Rs may not be sufficiently increased. Conversely, when the minimum radius of curvature of the area from the bottom 2 of the front outer edge to the heel Ph exceeds the above upper limit, the flight distance may decrease or the curve may change when the face 1 becomes smaller and deviates from the optimal strike point. Big fear.

作為前視之該木桿型高爾夫球桿頭之外緣自桿身中心軸C向跟部Ph側之突出距離Rp之下限，較佳為4 mm，更佳為5 mm。另一方面，作為前視之該木桿型高爾夫球桿頭之外緣自桿身中心軸C向跟部Ph側之突出距離Rp之上限，較佳為8 mm，更佳為7 mm。於前視之該木桿型高爾夫球桿頭之外緣自桿身中心軸C向根部Ph側之突出距離Rp未達上述下限之情形時，有難以設置插鞘5之虞。相反，於前視之該木桿型高爾夫球桿頭之外緣自桿身中心軸C向跟部Ph側之突出距離Rp超過上述上限之情形時，有難以增大重心距離Rs之虞。As a front view, the lower limit of the protrusion distance Rp of the outer edge of the wood-type golf club head from the shaft center axis C to the heel Ph side is preferably 4 mm, and more preferably 5 mm. On the other hand, as a front view, the upper limit of the protrusion distance Rp of the outer edge of the wood-type golf club head from the shaft center axis C to the heel Ph side is preferably 8 mm, and more preferably 7 mm. When the projecting distance Rp of the outer edge of the wood-type golf club head from the shaft center axis C to the root Ph side in front view does not reach the above-mentioned lower limit, it may be difficult to install the hosel 5. On the contrary, when the protrusion distance Rp of the outer edge of the wood-type golf club head from the shaft center axis C to the heel Ph side in front view exceeds the above upper limit, it may be difficult to increase the center of gravity distance Rs.

於該木桿型高爾夫球桿頭中，作為前視之自桿身中心軸C至跟部Ph之距離Rh之下限，較佳為3 mm，更佳為4 mm。另一方面，作為前視之自桿身中心軸C至跟部Ph之距離之上限，較佳為7 mm，更佳為6 mm。於前視之自桿身中心軸C至跟部Ph之距離Rh未達上述下限之情形時，由於桿面1之形狀呈橢圓而有最佳打擊點變小之虞。相反，前視之自桿身中心軸C至跟部Ph之距離Rh超過上述上限之情形時，有難以增大重心距離Rs之虞。In the wood-type golf club head, the lower limit of the distance Rh from the shaft center axis C to the heel Ph as a front view is preferably 3 mm, more preferably 4 mm. On the other hand, as the upper limit of the distance from the shaft center axis C to the heel Ph in the front view, it is preferably 7 mm, and more preferably 6 mm. When the distance Rh from the shaft center axis C to the heel Ph in the front view does not reach the above-mentioned lower limit, since the shape of the face 1 is elliptical, the best hitting point may become smaller. On the contrary, when the distance Rh from the shaft center axis C to the heel Ph in the front view exceeds the above upper limit, it may be difficult to increase the center of gravity distance Rs.

於該木桿型高爾夫球桿頭中，作為與桿身中心軸C距80 mm以上後方之區域之質量之下限，為桿頭全體質量之20%，較佳為21%，更佳為22%。另一方面，作為與桿身中心軸C距80 mm以上後方之區域之質量之上限，較佳為桿頭全體質量之30%，更佳為28%。於與桿身中心軸C距80 mm以上後方之區域之質量未達上述下限之情形時，由於繞垂直軸之慣性力矩變小故有打球之方向穩定性不充分之虞。相反，於與桿身中心軸C距80 mm以上後方之區域之質量超過上述上限之情形時，由於該木桿型高爾夫球桿頭變重，故有高爾夫球桿不易正確揮桿之虞。In this wood-type golf club head, the lower limit of the mass of the area behind the shaft center axis C more than 80 mm is 20% of the total mass of the head, preferably 21%, more preferably 22% . On the other hand, as the upper limit of the mass of the area at a distance of 80 mm or more from the shaft center axis C, it is preferably 30% of the total mass of the head, and more preferably 28%. When the mass of the area behind the shaft center axis C at a distance of 80 mm or more does not reach the above lower limit, the directional stability of the ball may be insufficient due to the decrease of the moment of inertia around the vertical axis. Conversely, when the mass of the area behind the shaft center axis C at a distance of 80 mm or more exceeds the above upper limit, the wood-type golf club head becomes heavier, so that the golf club may not be easy to swing correctly.

作為該木桿型高爾夫球桿頭之繞通過重心G之趾部及跟部(toe heel)方向之軸之慣性力矩之下限，較佳為3600 gcm² ，更佳為4000 gcm² 。另一方面，作為該木桿型高爾夫球桿頭之繞通過重心G之趾部及跟部方向之軸之慣性力矩之上限，較佳為5000 gcm² ，更佳為4500gcm² 。於該木桿型高爾夫球桿頭之繞通過重心G之趾部及跟部方向之軸之慣性力矩未達上述下限之情形時，由於賦予球之旋轉變得不穩定故有高爾夫球桿之飛行距離變得不充分之虞。相反，於該木桿型高爾夫球桿頭之繞通過重心G之趾部及跟部方向之軸之慣性力矩超過上述上限之情形時，由於該木桿型高爾夫球桿頭變重故有高爾夫球桿不容易正確揮桿之虞。As the lower limit of the moment of inertia of the wood-type golf club head around the axis passing through the toe of the center of gravity G and the toe heel direction, it is preferably 3600 gcm ² , more preferably 4000 gcm ² . On the other hand, as the upper limit of the moment of inertia of the wood-type golf club head around the axis passing through the toe of the center of gravity G and the heel direction, it is preferably 5000 gcm ² , and more preferably 4500 gcm ² . When the moment of inertia of the wood-type golf club head around the axis passing through the toe of the center of gravity G and the heel direction does not reach the above lower limit, the rotation given to the ball becomes unstable and the golf club flies The distance may become insufficient. On the contrary, when the moment of inertia of the wood-type golf club head around the axis passing through the toe of the center of gravity G and the heel direction exceeds the above upper limit, the wood-type golf club head becomes heavier. It is not easy to swing correctly.

作為該木桿型高爾夫球桿頭之繞通過重心G之鉛直軸之慣性力矩之下限，較佳為5500gcm² ，更佳為5700 gcm² 。另一方面，作為該木桿型高爾夫球桿頭之繞通過重心G之鉛直軸之慣性力矩之上限，較佳為5900 gcm² 。於該木桿型高爾夫球桿頭之繞通過重心G之鉛直軸之慣性力矩未達上述下限之情形時，有打球之方向穩定性不充分之虞。相反，於該木桿型高爾夫球桿頭之繞通過重心G之鉛直軸之慣性力矩超過上述上限之情形時，於現在之規則下無法在正式競技中使用。Examples of the wood-type golf club head by the lower limit of the moment of inertia about the vertical axis of the center of gravity G of, preferably 5500gcm ^2, more preferably 5700 gcm ^2. On the other hand, the upper limit of the moment of inertia of the wood-type golf club head around the vertical axis passing through the center of gravity G is preferably 5900 gcm ² . When the moment of inertia of the wood-type golf club head around the vertical axis passing through the center of gravity G does not reach the above lower limit, the directional stability of the ball may be insufficient. On the contrary, when the inertia moment of the wood-type golf club head around the vertical axis passing through the center of gravity G exceeds the above upper limit, it cannot be used in official competitions under the current rules.

＜桿面＞桿面1係形成為平面(嚴格而言具有稱為凸起及起伏之微小曲率，於前方呈凸狀)，亦可於其表面形成複數根劃痕線(小槽)。相反而言，桿面1係該木桿型高爾夫球桿頭之前側部分中之表面之曲率特別小之平面之區域。於桿面1形成之劃痕線於打球時防止球對於桿面1滑動，使得容易按照桿面1之打球線對打球面之角度而對球賦予後旋(back spin)。＜face＞ The face 1 is formed as a flat surface (strictly speaking, it has a small curvature called protrusions and undulations, and is convex at the front), and a plurality of scratch lines (small grooves) may be formed on the surface. On the contrary, the face 1 is a flat area where the curvature of the surface in the front side portion of the wood-type golf club head is particularly small. The scoring line formed on the face 1 prevents the ball from sliding with respect to the face 1 during play, so that it is easy to give back spin to the ball according to the angle of the line of play of the face 1 to the face of the play.

該木桿型高爾夫球桿頭之前視之桿面1之下緣可向下凸狀彎曲，但較佳設計為其最下點位於球之桿面重心點Ps之正下方。The lower edge of the front face 1 of the wood-type golf club head can be curved downward convexly, but it is preferably designed such that the lowest point is located directly below the center of gravity point Ps of the face of the ball.

作為桿面1之平均厚度之下限，較佳為2.0 mm，更佳為2.5 mm。另一方面，作為桿面1之平均厚度之上限，較佳為4.0 mm，更佳為3.0 mm。於桿面1之平均厚度未達上述下限之情形時，有桿面1之強度不足之虞。相反，於桿面1之平均厚度超過上述上限之情形時，有打球時之桿面1之撓曲變小且對球之運動能量之傳遞效率下降之虞或難以增大軸重心深度Dg之虞。The lower limit of the average thickness of the face 1 is preferably 2.0 mm, and more preferably 2.5 mm. On the other hand, as the upper limit of the average thickness of the face 1, it is preferably 4.0 mm, and more preferably 3.0 mm. When the average thickness of the face 1 does not reach the above lower limit, the strength of the face 1 may be insufficient. On the contrary, when the average thickness of the face 1 exceeds the above upper limit, the deflection of the face 1 during play may decrease and the transmission efficiency of the kinetic energy to the ball may decrease or it may be difficult to increase the depth Dg of the axial center of gravity. .

作為該木桿型高爾夫球桿頭之投影重心高度(自桿面1之下端至重心G之高度的距離)Hp之下限，較佳為桿面1之最大高度之53%，更佳為50%。另一方面，作為投影重心高度Hp之上限，較佳為桿面1之最大高度之60%，更佳為58%。若投影重心高度Hp未達上述下限，必須對底部2配置多餘重量而有高爾夫球桿不易正確揮桿之虞。反之，若投影重心高度Hp超過上述上限，由於能夠效率良好地將運動能量傳遞至球之最佳打擊點之位置變高，故有難以操縱高爾夫球桿之虞。As the lower limit of the height of the projected center of gravity of the wood-type golf club head (the distance from the lower end of the face 1 to the height of the center of gravity G) Hp, it is preferably 53% of the maximum height of the face 1 and more preferably 50% . On the other hand, as the upper limit of the height of the projected center of gravity Hp, it is preferably 60% of the maximum height of the face 1, and more preferably 58%. If the height of the projected center of gravity Hp does not reach the above-mentioned lower limit, excess weight must be placed on the bottom portion 2 and the golf club may not be easy to swing correctly. Conversely, if the height of the projected center of gravity Hp exceeds the above upper limit, the position at which the kinetic energy can be efficiently transmitted to the best hitting point of the ball becomes higher, which may make it difficult to manipulate the golf club.

＜底部＞底部2係自桿面1之下緣連續延伸，構成該木桿型高爾夫球桿頭之底。另，本案之底部2不僅意味著該木桿型高爾夫球桿頭之可抵接於地面之部分，還意味著包含連接與頂部3之間之所謂之側邊(Skirt)部分之該木桿型高爾夫球桿頭自下方觀察之整個面。該底部2較佳為整體朝下方形成為凸狀而於揮桿時不容易掃到地面。<Bottom> The sole 2 extends continuously from the lower edge of the face 1 and forms the sole of the wood-type golf club head. In addition, the bottom 2 in this case not only means the part of the wood-type golf club head that can abut on the ground, but also means the wood-type including the so-called skirt part connected with the top 3 The entire face of the golf club head viewed from below. The bottom 2 is preferably formed into a convex shape downward as a whole, so that it is not easy to sweep to the ground during a swing.

作為底部2之平均厚度(實心部除外)之下限，較佳為0.4 mm，更佳為0.6 mm。另一方面，作為底部2之平均厚度之上限，較佳為1.0mm，更佳為0.7 mm。若底部2之平均厚度未達上述下限，會有底部2之強度不充分之虞。反之，若底部2之平均厚度超過上述上限，則有難以增大該木桿型高爾夫球桿頭之軸重心深度Dg之虞。As the lower limit of the average thickness of the bottom 2 (except for the solid part), it is preferably 0.4 mm, more preferably 0.6 mm. On the other hand, as the upper limit of the average thickness of the bottom 2 is preferably 1.0 mm, more preferably 0.7 mm. If the average thickness of the bottom 2 does not reach the above lower limit, the strength of the bottom 2 may be insufficient. Conversely, if the average thickness of the sole 2 exceeds the above upper limit, it may be difficult to increase the depth Dg of the axial center of gravity of the wood-type golf club head.

＜頂部(crown)＞頂部3係自桿面1之上緣連續延伸，構成該木桿型高爾夫球桿頭之上面。更詳細而言，頂部3設為自桿面1之上緣向後方且上方延伸、彎曲且後端向下延伸與底部2連接並呈凸狀之曲面。＜Top (crown)＞ The top 3 is continuously extended from the upper edge of the face 1 and constitutes the upper surface of the wood-type golf club head. In more detail, the top 3 is a convex curved surface extending rearward and upward from the upper edge of the face 1, curved, and extending downward from the rear end to connect with the bottom 2.

作為頂部3之平均厚度(實心部除外)之下限，較佳為0.3 mm，更佳為0.4 mm。另一方面，作為頂部3之平均厚度之上限，較佳為0.8 mm，更佳為0.6 mm。若頂部3之平均厚度未達上述下限，會有頂部3之強度不充分之虞。反之，若頂部3之平均厚度超過上述上限，則有難以增大該木桿型高爾夫球桿頭之重心高度Hg及軸重心深度Dg之虞。As the lower limit of the average thickness of the top 3 (except for the solid part), it is preferably 0.3 mm, and more preferably 0.4 mm. On the other hand, as the upper limit of the average thickness of the top 3, it is preferably 0.8 mm, more preferably 0.6 mm. If the average thickness of the top 3 does not reach the above lower limit, the strength of the top 3 may be insufficient. Conversely, if the average thickness of the top 3 exceeds the above upper limit, it may be difficult to increase the center of gravity height Hg and the depth of the axial center of gravity Dg of the wood-type golf club head.

作為自桿身中心軸C至頂部3之頂點Pc之前後方向距離之下限，較佳為15 mm，更佳為17 mm。另一方面，作為自桿身中心軸C至頂部3之頂點Pc之前後方向距離之上限，較佳為21 mm，更佳為19 mm。若自桿身中心軸C至頂部3之頂點之前後方向距離未達上述下限，有難以將頂部3之形狀設為於擊球時可效率良好地傳遞該木桿型高爾夫球桿頭之運動能量之形狀之虞。反之，若自桿身中心軸C至頂部3之頂點之前後方向距離超過上述上限，則將頂部3之形狀最佳化時會有重心G之位置變得過高之虞。The lower limit of the distance from the shaft center axis C to the apex Pc of the top 3 in the front and rear direction is preferably 15 mm, and more preferably 17 mm. On the other hand, as the upper limit of the distance from the shaft center axis C to the apex Pc of the top 3 in the front and back direction, it is preferably 21 mm, and more preferably 19 mm. If the front and rear distance from the shaft center axis C to the apex of the top 3 does not reach the above lower limit, it is difficult to set the shape of the top 3 to efficiently transmit the kinetic energy of the wood-type golf club head when hitting the ball. The shape of it. Conversely, if the distance in the front and back direction from the shaft center axis C to the apex of the top 3 exceeds the above upper limit, the position of the center of gravity G may become too high when the shape of the top 3 is optimized.

＜插鞘＞插鞘5係劃定供桿身(未圖示)之前端***固定之桿身孔4之筒狀體。插鞘5以特定之角度突出設置於頂部3之跟部Ph側前部。該插鞘5較佳為至少與頂部3一體地形成。＜Hose hose＞ The hosel 5 is a cylindrical body in which the front end of the shaft (not shown) is inserted into the fixed shaft hole 4. The hosel 5 is protrudingly arranged at the front part of the heel part Ph side of the top part 3 at a specific angle. The hosel 5 is preferably formed integrally with at least the top 3.

＜作用＞一般而言，高爾夫球手於擊球時一面使高爾夫球桿頭繞桿身旋轉一面打擊球體。高爾夫球桿頭之繞桿身之旋轉速度係隨高爾夫球手而異，大致在600 rpm前後。平均於1號木桿用高爾夫球桿頭中，自桿身中心軸至桿面重心點之重心距離Rs為38 mm左右。於該情形時，高爾夫球桿頭繞桿身中心軸旋轉之桿面重心點之速度為大約2.4m/s。<Function> Generally speaking, when a golfer hits the ball, the golf club head rotates around the shaft while hitting the ball. The rotation speed of the golf club head around the shaft varies from golfer to golfer, and is roughly around 600 rpm. In an average driver golf club head, the center of gravity distance Rs from the shaft center axis to the face center of gravity is about 38 mm. In this case, the speed of the center of gravity of the club face when the golf club head rotates around the shaft center axis is approximately 2.4 m/s.

另一方面，於該木桿型高爾夫球桿頭，即便重心距離Rs為45 mm，高爾夫球桿頭於相同角速度下之旋轉所致之桿面重心點之速度亦會變大至約3.0m/s。桿面重心點之速度差0.6 m/s若換成球之飛行距離，則可以說有約3碼之差。現在，關於高爾夫球制定了各種規則，對於高爾夫球手而言，藉由高爾夫球桿頭之設計可提高3碼飛行距離是非常大的優勢。On the other hand, in this wood-type golf club head, even if the center of gravity distance Rs is 45 mm, the speed at the center of gravity point of the club face caused by the rotation of the golf club head at the same angular velocity will increase to about 3.0m/ s. If the speed difference of the center of gravity of the club face is 0.6 m/s, it can be said that there is a difference of about 3 yards if it is replaced by the flight distance of the ball. Currently, various rules have been established for golf. For golfers, it is a great advantage to increase the flight distance of 3 yards by designing the golf club head.

一般而言，若高爾夫球桿頭之重心距離Rs變長，則桿頭難以旋轉，故容易誘發擊球失誤。針對此，藉由增大軸重心深度Dg，由於擊球時重心向桿頭行進方向前進而促進高爾夫球桿頭之旋轉，故高爾夫球桿之操縱變得容易，可抑制擊球失誤。Generally speaking, if the center of gravity distance Rs of the golf club head becomes longer, it is difficult for the club head to rotate, and therefore it is easy to induce hitting errors. In response to this, by increasing the axial center of gravity depth Dg, since the center of gravity advances in the direction of the club head when hitting the ball, the rotation of the golf club head is promoted, so that the golf club can be easily manipulated and hitting errors can be suppressed.

於平均1號木桿用高爾夫球桿頭中，軸重心深度Dg為15 mm至20 mm左右。即使為該程度之軸重心深度Dg，若重心距離Rs為38 mm左右，則即便是業餘高爾夫球手亦可毫無問題地旋轉高爾夫球桿。但是，於重心距離Rs為上述45 mm以上之情形時，若軸重心深度Dg為22 mm以上，則對於業餘高爾夫球手而言會極難操縱高爾夫球桿。In an average driver golf club head, the depth Dg of the axial center of gravity is about 15 mm to 20 mm. Even with this degree of axial center of gravity depth Dg, if the center of gravity distance Rs is about 38 mm, even amateur golfers can spin the golf club without any problems. However, when the center of gravity distance Rs is 45 mm or more, if the depth Dg of the axial center of gravity is 22 mm or more, it will be extremely difficult for amateur golfers to manipulate the golf club.

該木桿型高爾夫球桿頭藉由增大與桿身中心軸C距80 mm以上後方區域之質量，從而軸重心深度Dg變得相對較大。因此，儘管該木桿型高爾夫球桿頭飛行距離相對較大，打球之方向穩定性仍優異。This wood-type golf club head increases the mass of the rear area at a distance of more than 80 mm from the shaft center axis C, so that the axial center of gravity depth Dg becomes relatively large. Therefore, despite the relatively large flight distance of the wood-type golf club head, the directional stability of the ball is still excellent.

[其他實施形態] 上述實施形態並非限定本發明之構成。因此，上述實施形態可基於本說明書之記載及技術常識而省略、置換或追加上述實施形態各部之構成要素，該等應全部解釋為屬於本發明之範圍者。[Other embodiments] The above-mentioned embodiment does not limit the structure of the present invention. Therefore, the above-mentioned embodiment may omit, replace or add the constituent elements of each part of the above-mentioned embodiment based on the description of this specification and technical common sense, and all of these should be interpreted as belonging to the scope of the present invention.

本發明亦可應用於1號木桿以外之木桿型高爾夫球桿。 [實施例]The present invention can also be applied to wood-type golf clubs other than drivers. [Example]

以下，基於實施例詳細敘述本發明，但不應解釋為基於該實施例之記載而限定本發明。Hereinafter, the present invention will be described in detail based on examples, but it should not be interpreted as limiting the present invention based on the description of the examples.

(試作品1) 試作如下之試作品：重心距離為45 mm，軸重心深度為20 mm，自跟部至趾部之長度為126 mm，自桿身中心軸至最背面之前後方向距離為92 mm，繞通過重心之鉛直軸之慣性力矩為4000g/cm² ，繞通過重心之趾部及跟部方向之軸之慣性力矩為2800gcm² ，與桿身中心軸距80 mm以上後方之區域之質量比例為5%之右撇子用之高爾夫球桿頭之試作品1。(Trial work 1) The trial work is as follows: the center of gravity distance is 45 mm, the depth of the axial center of gravity is 20 mm, the length from the heel to the toe is 126 mm, and the distance from the shaft center axis to the back of the shaft is 92 mm, the moment of inertia around the vertical axis passing through the center of gravity is 4000g/cm ² , the moment of inertia around the axis passing through the toe and heel direction of the center of gravity is 2800gcm ² , the mass of the area behind the shaft center axis distance of more than 80 mm Proportion of 5% right-handed golf club head trial work 1.

(試作品2) 針對於重心距離為45 mm，軸重心深度為35 mm，跟部至趾部之長度為126 mm，自桿身中心軸至最背面之前後方向距離為115 mm，繞通過重心之鉛直軸之慣性力矩為5600g/cm² ，繞通過重心之趾部及趾底方向之軸之慣性力矩為4500gcm² ，與桿身中心軸距80 mm以上後方之區域之質量比例為22%之高爾夫球桿頭之試作品2，使用機器人，將桿頭速度設為40m/s，設定為球體碰撞桿面重心點進行試打。(Trial work 2) For a center of gravity distance of 45 mm, a shaft center of gravity depth of 35 mm, a length from heel to toe of 126 mm, and a distance of 115 mm from the shaft center axis to the back of the shaft, passing through the center of gravity The moment of inertia of the vertical axis is 5600g/cm ² , the moment of inertia about the axis passing through the center of gravity and the direction of the toe is 4500gcm ² , and the mass ratio of the area behind the shaft center axis distance of 80 mm or more is 22% Trial work 2 of the golf club head, using a robot, set the head speed to 40m/s, and set the ball to collide with the center of gravity of the face for trial play.

於該試打時，測定球體之擊球角度(相對於前後方向之傾斜角度)以及著陸點與前後方向中央線之間隔距離。將該測定結果顯示於以下表1。During the trial hitting, measure the ball hitting angle (the angle of inclination relative to the front and rear direction) and the distance between the landing point and the center line in the front and rear direction. The measurement results are shown in Table 1 below.

[表1]

[Table 1]

僅重心距離較大且軸重心深度較小之高爾夫球桿頭之試作品1由於擊球瞬間桿面未轉動而以向右開放之狀態打球，故球朝右方向擊出，其結果，著陸點亦為相對於中心朝右方向偏離12碼之位置。Only the trial work of a golf club head with a large center of gravity distance and a small depth of the axial center of gravity 1 Since the club face did not rotate at the moment of impact and the ball was played in an open state to the right, the ball was hit in the right direction. As a result, the landing point It is also 12 yards away from the center to the right.

另一方面，不僅重心距離較大且軸重心距離亦較大之高爾夫球桿頭之試作品2被認為由於擊球時桿面適當地轉動成為朝向正面之狀態，故球幾乎筆直地被擊出，著陸點亦幾乎為中心。On the other hand, the trial work 2 of a golf club head that not only has a large center of gravity distance but also a large axial center of gravity distance, is considered to be almost straight because the face of the club is properly rotated to face the front when hitting the ball. , The landing point is almost at the center.

一般認為若自桿面之前後方向之最前端點至桿頭內部之重心位置之水平距離即重心深度越大則高爾夫球桿頭越容易收回(以向右開放之狀態擊球之情況較少)。然而，該重心深度之值不僅根據桿頭之內部重心位置亦根據桿面之位置變化。決定高爾夫球桿頭之桿面之收回容易度畢竟是重心位置與桿身中心軸之關係，故藉由增大軸重心深度，可更確實地提高重心距離較大而桿面變得難以收回之高爾夫球桿頭的桿面收回。It is generally believed that if the horizontal distance from the front and back of the club face to the center of gravity position inside the club head, that is, the greater the depth of the center of gravity, the easier the golf club head will retract (it is less likely to hit the ball in a right-open state) . However, the value of the depth of the center of gravity varies not only according to the position of the inner center of gravity of the head but also according to the position of the face. After all, it is the relationship between the position of the center of gravity and the center axis of the shaft that determines the ease of retracting the face of the golf club head. Therefore, by increasing the depth of the axis of gravity, the center of gravity distance can be increased more reliably and the face becomes difficult to retract. The face of the golf club head retracts.

其次，使用該等高爾夫球桿頭之試作品1及2，調整定位時桿面之朝向以使擊球時桿面朝向正面並且設置機器人，於使球碰撞之位置自桿面重心點向趾部偏離20 mm進行擊球。將該測定結果顯示於下述表2。Secondly, using the trial works 1 and 2 of these golf club heads, adjust the orientation of the club face during positioning so that the club face faces the front when hitting the ball and set up a robot to make the ball collide from the center of gravity of the club face to the toe Deviate 20 mm to hit the ball. The measurement results are shown in Table 2 below.

[表2]

[Table 2]

與桿身中心軸距80 mm以上後方之區域之質量比例較大之高爾夫球桿頭之試作品2和與桿身中心軸距80 mm以上後方之區域之質量比例較小之高爾夫球桿頭之試作品1相比，確認為打球之方向穩定性更優異。Trial work 2 of a golf club head with a larger mass ratio in the area behind the shaft center wheelbase of 80 mm or more, and a golf club head with a smaller mass ratio in the area behind the shaft center wheelbase of 80 mm or more Compared with trial work 1, it was confirmed that the directional stability of the ball was better.

此可認為是由於高爾夫球桿頭之試作品2與高爾夫球桿頭之試作品1相比慣性力矩較大，於以趾部側20 mm打擊時球體之擊出方向之偏差亦較小，其結果，相比於高爾夫球桿頭之試作品1，著陸位置自中心之偏差變小。即，可認為因繞通過重心之鉛直軸之慣性力矩之大小不同，於遠離桿面重心點之部位打擊時之高爾夫球桿頭之旋轉角度變小，可提高高爾夫球桿之方向性。This can be considered to be due to the larger moment of inertia between the golf club head trial work 2 and the golf club head trial work 1, and the smaller deviation in the direction of the ball when hitting at the toe side 20 mm. As a result, the deviation of the landing position from the center becomes smaller compared to the trial work 1 of the golf club head. That is, it can be considered that due to the difference in the magnitude of the moment of inertia around the vertical axis passing through the center of gravity, the rotation angle of the golf club head when hitting at a position far from the center of gravity point of the face becomes smaller, and the directionality of the golf club can be improved.

又，可認為高爾夫球桿頭之試作品2與高爾夫球桿頭之試作品1相比，由於軸重心深度較大而不會於桿面開放之狀態下打擊，且由於重心距離較大打擊點之速度提高，飛行距離拉長，且由於繞通過重心之鉛直軸之慣性力矩較大，故即使於遠離桿面重心點之部位打擊，方向穩定性亦較高。因此，高爾夫球桿頭之試作品1對於業餘高爾夫球手而言非常容易操縱，可期待得分提高。 [產業上之可利用性]In addition, it can be considered that the golf club head trial work 2 is compared with the golf club head trial work 1, due to the greater depth of the axis of gravity, it will not hit with the face open, and the distance from the center of gravity is greater. The speed increases, the flight distance is elongated, and because the moment of inertia around the vertical axis passing through the center of gravity is larger, the directional stability is also higher even when hitting at a position far from the center of gravity of the club face. Therefore, the trial work 1 of the golf club head is very easy to handle for amateur golfers, and an improvement in the score can be expected. [Industrial availability]

本發明之木桿型高爾夫球桿頭可較佳利用為1號木桿用高爾夫球桿頭。The wood-type golf club head of the present invention can be preferably used as a golf club head for a driver.

1‧‧‧桿面 2‧‧‧底部 3‧‧‧頂部 4‧‧‧桿身孔 5‧‧‧插鞘 As‧‧‧實心區域 C‧‧‧桿身中心軸 Dc‧‧‧自桿身中心軸至最背面之前後方向距離 Dg‧‧‧軸重心深度 Dw‧‧‧前後方向之長度 G‧‧‧重心 Hg‧‧‧重心高度 Hp‧‧‧投影重心高度 Ht‧‧‧趾部高度 Hw‧‧‧桿頭高度 Lw‧‧‧自跟部至趾部之水平長度 Pb‧‧‧最下點 Pc‧‧‧頂點 Ph‧‧‧跟部 Pr‧‧‧後端點 Ps‧‧‧桿面重心點 Pt‧‧‧趾部 Rh‧‧‧自桿身中心軸至跟部之距離 Rp‧‧‧外緣之自桿身中心軸之突出距離 Rs‧‧‧重心距離 X-X‧‧‧線1‧‧‧Face 2‧‧‧Bottom 3‧‧‧Top 4‧‧‧Shaft hole 5‧‧‧Hose As‧‧‧Solid area C‧‧‧Shaft shaft Dc‧‧‧The distance from the shaft center axis to the back and front direction Dg‧‧‧Axis of gravity depth Dw‧‧‧The length of the front and rear direction G‧‧‧center of gravity Hg‧‧‧Center of gravity height Hp‧‧‧Projection center of gravity height Ht‧‧‧Toe height Hw‧‧‧Head height Lw‧‧‧Horizontal length from heel to toe Pb‧‧‧The lowest point Pc‧‧‧Vertex Ph‧‧‧ heel Pr‧‧‧back endpoint Ps‧‧‧Face point of gravity Pt‧‧‧toe Rh‧‧‧The distance from the shaft center axis to the heel Rp‧‧‧Outer edge protrusion distance from the shaft center axis Rs‧‧‧Center of gravity distance X-X‧‧‧line

圖1係本發明之一實施形態之木桿型高爾夫球桿頭之模式性前視圖。圖2係圖1之木桿型高爾夫球桿頭之模式性俯視圖。圖3係圖1之木桿型高爾夫球桿頭之模式性X-X線剖視圖。Fig. 1 is a schematic front view of a wood-type golf club head according to an embodiment of the present invention. Figure 2 is a schematic top view of the wood-type golf club head of Figure 1; Fig. 3 is a schematic X-X sectional view of the wood-type golf club head of Fig. 1.

1‧‧‧桿面 1‧‧‧Face

2‧‧‧底部 2‧‧‧Bottom

3‧‧‧頂部 3‧‧‧Top

4‧‧‧桿身孔 4‧‧‧Shaft hole

5‧‧‧插鞘 5‧‧‧Hose

C‧‧‧桿身中心軸 C‧‧‧Shaft shaft

G‧‧‧重心 G‧‧‧center of gravity

Hg‧‧‧重心高度 Hg‧‧‧Center of gravity height

Hp‧‧‧投影重心高度 Hp‧‧‧Projection center of gravity height

Ht‧‧‧趾部高度 Ht‧‧‧Toe height

Hw‧‧‧桿頭高度 Hw‧‧‧Head height

Lw‧‧‧自跟部至趾部之水平長度 Lw‧‧‧Horizontal length from heel to toe

Pb‧‧‧最下點 Pb‧‧‧The lowest point

Pc‧‧‧頂點 Pc‧‧‧Vertex

Ph‧‧‧跟部 Ph‧‧‧ heel

Ps‧‧‧桿面重心點 Ps‧‧‧Face point of gravity

Pt‧‧‧趾部 Pt‧‧‧toe

Rh‧‧‧自桿身中心軸至跟部之距離 Rh‧‧‧The distance from the shaft center axis to the heel

Rp‧‧‧外緣之自桿身中心軸之突出距離 Rp‧‧‧Outer edge protrusion distance from the shaft center axis

Rs‧‧‧重心距離 Rs‧‧‧Center of gravity distance

X-X‧‧‧線 X-X‧‧‧line

Claims

一種木桿型高爾夫球桿頭，其重心距離為45mm以上50mm以下，自桿身中心軸至最背面之前後方向距離為110mm以上，且距離桿身中心軸80mm以上後方之區域之質量為全體之質量20%以上，其中，該重心距離係自將重心垂直投影至桿面之點至桿身中心軸之垂直距離。 A wood-type golf club head with a center of gravity distance of 45mm or more and 50mm or less, a distance of 110mm or more from the shaft center axis to the back of the shaft, and the mass of the area behind the shaft center axis 80mm or more. The mass is more than 20%, where the center of gravity distance is the vertical distance from the point where the center of gravity is projected vertically on the face to the center axis of the shaft.

如請求項1之木桿型高爾夫球桿頭，其中繞通過重心之趾部及跟部(toe heel)方向之軸之慣性力矩為3600gcm²以上5000gcm²以下，繞通過重心之鉛直軸之慣性力矩為5500gcm²以上5900gcm²以下。 A wood type golf club head according to item 1 of the request, wherein the moment of inertia of the shaft (toe heel) about the direction of the toe portion and the heel portion through the center of gravity of ² or more or less 5,000 gcm 3600gcm ^2, the moment of inertia about a vertical axis through the center of gravity It is 5500gcm ² or more and 5900gcm ² or less.

如請求項1或2之木桿型高爾夫球桿頭，其中重心高度為桿頭高度之38%以上43%以下。 Such as the wood-type golf club head of claim 1 or 2, in which the height of the center of gravity is 38% to 43% of the height of the head.

如請求項1或2之木桿型高爾夫球桿頭，其中體積為450cm³以上，且前視下外緣之自桿身中心軸朝跟部側之突出距離為8mm以下。 For example, the wood-type golf club head of claim 1 or 2, in which the volume is 450 cm ³ or more, and the protruding distance of the outer edge from the shaft center axis toward the heel side in front view is 8 mm or less.

如請求項1或2之木桿型高爾夫球桿頭，其中於前視下自桿身中心軸至跟部之距離為7mm以下。 For example, the wood-type golf club head of claim 1 or 2, wherein the distance from the shaft center axis to the heel in front view is less than 7mm.

如請求項1或2之木桿型高爾夫球桿頭，其中自桿身中心軸至重心之前後方向距離為25mm以上45mm以下。 For example, the wood-type golf club head of claim 1 or 2, wherein the distance from the shaft center axis to the center of gravity is 25mm or more and 45mm or less.

如請求項1或2之木桿型高爾夫球桿頭，其中自跟部至趾部之水平長度為120mm以上。 Such as the wood-type golf club head of claim 1 or 2, wherein the horizontal length from heel to toe is 120mm or more.