JP2019084323A - Golf club head - Google Patents

Abstract

To provide a golf club head capable of improving repulsion performance while preventing reduction in durability of a face part, and increasing a carry.SOLUTION: A golf club head having a face part 2 for hitting a ball comprises, on an inner surface of the face part 2, a circular central thick part 2a having a prescribed thickness with a sweet spot as a center point of the face part 2, and an annular groove 2b formed so as to surround an outer edge of the central thick part 2a. In the annular groove 2b, an inclined surface 2c inclined from the central thick part 2a toward a bottom part of the annular groove 2b is formed. An outer edge side of the annular groove 2b forms a wall surface 2d substantially perpendicular to the face part 2 and the cross-sectional shape is formed in a substantially V shape. The thickness between the bottom part of the annular groove 2b and the face part 2 is 0.1 mm to 0.9 mm.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a golf club head capable of improving the resilience performance of a face portion.

  Among golf club heads, particularly in the case of wood type golf club heads such as a driver and a spoon, a flight distance performance is required to fly the ball farther. It is effective to improve the resilience performance of the head in order to fly the hitting ball far more efficiently, and in the prior art, a technology to make the face part easy to bend by lowering the rigidity of the face part that hits the ball. Various proposals have been made.

  For example, as shown in FIG. 11A, in the Japanese Utility Model Application Publication No. 2-29973 (Patent Document 1), a face surface portion 101 having a substantially U-shaped cross section is provided on the ball striking surface portion of the head main body 100. It has been shown to make the inner circumferential corner edge 102 of the wall thinner. Further, as shown in FIG. 11B, in JP-A-9-299519 (Patent Document 2), as shown in FIG. 11B, in the wood type golf club head, the inner surface of the face wall portion 103 is surrounded by an oblong oval so as to surround the inner surface. It is disclosed to provide a shaped groove 104. As described above, providing a laterally elongated elliptical groove on the inner surface of the face portion is disclosed in Japanese Patent Application Laid-Open Nos. 2001-129131 (patent document 3), 2001-129133 (patent document 4), and 2004-313354 (patent document 3). Patent document 5), Unexamined-Japanese-Patent 2004-358225 (patent document 6), and Unexamined-Japanese-Patent 2005-143601 (patent document 7) are also disclosed.

Japanese Utility Model Application Publication No. 2-29973 Japanese Patent Application Laid-Open No. 9-299519 JP 2001-129131 A JP 2001-129133 A JP 2004-313354 A JP 2004-358225 A JP, 2005-143601, A

  However, since the golf club head disclosed in Patent Document 1 reduces the thickness of only the inner circumferential corner of the face portion, the rigidity of the face portion can not be sufficiently reduced, and the rigidity is reduced. The face surface portion 101 is likely to be damaged. Further, the golf club head disclosed in Patent Document 2 leaves room for further improvement in the improvement of resilience performance, such as setting the thickness of the central portion of the face portion to 5 mm or more.

  Furthermore, in the golf club head shown in Patent Documents 2 to 7, since the groove portion provided on the inner surface of the face portion is formed in a horizontally long oval shape, the ball is a thick portion inside the groove portion of the face portion. When the ball is hit, since the distance to the groove in the longitudinal direction is short, it becomes difficult to bend and breakage such as a crack is easily generated in the groove. In addition, such an annular groove originally reduces the rigidity of the face portion, causes the face portion to be sufficiently bent at the time of hitting, exerts a spring effect, and improves the resilience performance of the head. However, when the ball hits a thick part, the spring effect becomes unbalanced in the longitudinal direction and the lateral direction because the distance between the longitudinal direction and the lateral direction to the groove portion is different, thus increasing the initial velocity of striking the ball. Can not be achieved, and the expected flight distance can not be obtained.

  An object of the present invention is to provide a golf club head capable of improving the resilience performance while preventing the decrease in the durability of the face portion in view of the above problems, and capable of increasing the flight distance. .

  In order to solve the above problems, the golf club head according to the present invention is a golf club head having a face portion for hitting a ball, and a sweet spot point is predetermined on the inner surface of the face portion with the center point of the face portion. And an annular groove formed to surround the outer edge of the central thick portion, the annular groove being formed from the central thick portion to the bottom of the annular groove. The outer edge side of the annular groove forms a wall surface substantially perpendicular to the face portion, and the width of the cross-sectional shape is 0.1 mm to 0.3 mm and perpendicular to the wall surface. Cut from the outside of the face surface in a straight line from the back surface at a position of 0.5 mm to 0.9 mm, and the thickness between the bottom of the annular groove and the face portion is 0.1 mm to 0.9 mm And that It is a fact.

  Furthermore, the central thick portion and the annular groove are integrally formed on the inner surface of the face portion formed in a predetermined shape.

  Further, the central thick portion and the annular groove are formed on one side of the ball striking plate having a diameter larger than that of the annular groove having a predetermined thickness, and the outer edge side of the annular groove substantially corresponds to the ball striking plate. An annular ridge forming a vertical wall surface is formed, and the ball striking plate is fitted into a through hole formed in the face portion, and a flange portion formed around the periphery is fixed to the face portion, and the ball striking plate and the ball striking portion The surface of the face portion may be the same surface.

  Also, the central thick portion and the annular groove are formed on the inner surface of the face portion that strikes a ball of a wood type golf club head.

  Also, the central thick portion and the annular groove are formed on the inner surface of the face portion that strikes the ball of the iron type golf club head.

  In addition, on the inner surface side of the central thick portion and the annular groove formed on the inner surface of the face portion, a rigid recess restricting plate is provided, and when the ball is hit with a ball, the recess suppressing plate transitions to the central thick portion It is desirable to contact by this and always separate from the said center thick part.

  According to the golf club head of the present invention, the ball has a circular shape of the face portion by forming a central thick portion and an annular groove surrounding the central thick portion on the inner surface of the face portion of the golf club head. When the ball is hit at the thick central part of the ball, the distance to the annular groove is equal and therefore it is uniformly bent, so that a spring effect is generated in good balance in the entire circumferential direction of the thick central part to increase the initial speed of hitting. It is possible to increase the flight distance. Further, by uniformly bending the circular thick central portion and the annular groove, breakage such as a crack is less likely to occur in the annular groove. Moreover, since the thickness between the bottom of the annular groove and the face portion is 0.5 mm to 0.9 mm, the rigidity of the face portion can be efficiently reduced, and the face portion is sufficiently bent at the time of hitting a ball. It is possible to improve the resilience performance of the head. Furthermore, a slope inclined from the central thick portion toward the bottom of the annular groove is formed, and the width of the substantially vertical wall formed on the outer edge side of the annular groove is 1 mm to 10 mm, and the vertical wall By collapsing to the groove side by impact due to a collision, the vertical wall tends to crush the groove and breakage can be prevented, but it is confirmed that the part will fly the ball far due to repulsion, and the part will be extended for a long time A music wire made of 0.975 mm to 0.800 mm Swedish steel, which is also used as a piano chord in this groove, is ring-shaped and fitted in an annular groove for protection or retention, but it is possible to fit or not Capable of capping the top of the wall, the shape of the lid is configured and configured to seal the entire annular hollow portion including the annular groove.

  Further, by integrally forming the central thick portion and the annular groove on the inner surface of the face portion formed in a predetermined shape, the sectional shape of the annular groove is titanium which is adjacent to the annular groove for preventing breakage of the annular groove. The vertical wall of the alloy has a width of 1 mm to 10 mm, and the vertical wall tends to collapse to the groove side due to the impact from the collision with the ball, so the vertical wall tends to crush the groove and can prevent breakage. The part is repelled and it is confirmed that the ball will fly away, and the top of the wall is capped to protect or hold the part over a long period of time, and the shape of the lid is the entire annular hollow including the annular groove It is comprised by the method of providing so that it may be in a sealing state. Furthermore, although the impact generated by the ball collision across the face is transmitted to the crown and the sole and the repulsive action occurs simultaneously, it is hit against the sealed repulsion device on the back of the face so that the impact received on the face is strongly repelled. The rigidity is increased by providing the arched pressing stoppers in contact with each other, and the face portion of the golf club head can be easily formed. This is as shown in the first and sixth aspects.

  The face part is provided with a breakage prevention device on the back of the face, but the device should be a strong repulsive stopper to withstand an impact exceeding 1 ton on the striking face, and put the music wire in the annular groove Although it does not fit when it is fitted or when the tendency to crush the annular groove is large due to the inclined wall, in order to reinforce the strength of the annular groove, a rigid arched pole is abutted against the rear surface to protect it, It is a wood type golf head having a function as a lid of a repulsive stopper by making the inside of the device airtight.

  The arched pole is a wood-type golf head that is a repelling apparatus having a protrusion that presses against the face surface when the ball is hit.

  The arched pole pressing the repulsive stopper is a low center of gravity wood type golf head whose weight is increased on the sole side.

  It is a wood type golf head in which weight is distributed to the aft sole from the center of gravity value so that the club weight near the face surface does not become heavy.

  A golf club provided with a face portion for striking a ball, and in the center of the inner surface of the face, a narrow groove is carved as narrow as possible around a portion called sweet spot, but when the golf ball is made to collide, The groove may cause the face to be broken or cracked, etc. The device for making the protection more robust than the rear around the groove is repelled by the stopper to make the face deep You can defend the ditch. As a result, it becomes possible to make the face surface thinner, and by creating elastic deformation of the face portion having a stronger repulsive surface, it is transmitted as a striking pressure to the golf ball by repulsion, and is constructed to extend flight distance.

  According to the wood type golf club head of the present invention, since the stopper device is disposed on the inner surface of the face portion for striking the ball, the striking portion elastically deforms by striking the ball, and the repulsion device repels the ball after pressing. Because it makes it possible to increase the flight distance. Furthermore, since it is formed so as to be pressed by the arched pole from the rear of the repelling apparatus, the striking repulsion action is largely generated from the repelling surface to the face surface, so it is possible to fly further. In addition, since the repulsion devices to which they are pressed are easy to form and processed, they are lightweight compared to other methods of press forming devices, and they do not adversely affect the increase in total club weight.

  In addition, it is possible to prevent damage due to impact such as hitting a ball, and to control the manufacturing cost due to its structure.

  Furthermore, because it is lightweight, it is easy for women, men, elderly people, etc. to swing, and variations in swing are reduced, and since a large force is not required, damage can be prevented, so the quality can be maintained.

  In addition, because weight reduction can be achieved, it is easy to hit with a low center of gravity, and a stable swing can be made.

  And, since the repulsive force is transmitted to the face portion by the repulsive elasticity of the repulsion device, the flight distance can be increased. In addition, since a flat face closer to a plane is easier to transmit energy when in contact with the ball than a part of the face is a circular arc, the function of the repulsion device is to repel to obtain a predetermined repulsive force. It is desirable to form the surface substantially flat. However, it is not completely flat. It is said that the force when the ball is deformed at the time of a collision is called the striking force or impact force, and the change when the striking force works is complicated, but when the working time is measured with a measuring instrument, the change of momentum It is possible to calculate the value of the impulse calculated from the time difference between ball contact and moment of departure. Then, the second law of motion is regarded as the relation between momentum and impulse, and the object of mass moving on a straight line is made a vector, and "The rate of change of momentum with time is Equal to the force applied to Therefore, the impulse can be seen as the cause of the change in the momentum of the object, and when making the face a plane shape rather than an arc shape, the force is simply multiplied by the time when the force is applied rather than a plane surface. Not being said, I thought about the product itself, and found one new physical quantity, multiplying it with another, and thinking the impulse with a vector having the same direction as the force. That is, it is possible to transfer energy to the ball for a little longer by thinking of the time difference of the moment when the ball touched away from the moment when it was touched, and obtaining a greater repulsive force. Can do. When developing a thin club head as in the present invention, it is effective to provide a fracture limit clearance which may cause breakage or breakage of the club head, and abuts and supports the rebound device stopper with a pressure arch type pipe You need to keep in mind that you need a robust stopper. The arched pipe is used to exhibit rigidity that is higher in strength than one pillar, and in order to increase the strength, a reinforcing member 17 may be used.

この式を時間で微分すると重心の速度の式υＧが得られる。

例えば衝突の場合のように運動量保存の法則が成り立つとき、衝突前の各物体の速度と重心の速度をυ_１、υ_２、υＧ、衝突後の各物体の速度と重心の速度をυ_１’、υ_２’、υＧ’、とすると、ｍ_１ υ_１＋ｍ_２ υ_２＝ｍ_１ υ_１’＋ｍ_２ υ_２’が成り立つから、

即ち、運動量保存の法則が成り立つ時、重心の速度は一定であり、言い換えると、外力が働かない時は、重心に関して慣性の法則が成り立つ。結果としてゴルフクラブは軽量化しヘッドスピードを速くする事が望まれる。In the case of in-plane collision or two-dimensional collision, when the momentum of each object is decomposed in two directions orthogonal to each other, the momentum is preserved in each direction. For example, when each momentum is decomposed in the x and y axis directions orthogonal to each other as y in FIG. 11 (sum of momentum in the x axis direction before collision) = (sum of momentum in the x axis direction after collision), The sum of the momentum in the y-axis direction before the collision = (sum of the momentum in the y-axis direction after the collision) holds. The momentum is given a +,-sign according to the orientation of each coordinate axis. Furthermore, as the momentum conservation and the movement of the center of gravity, the center of gravity xG of an object of mass m ₁ and m ₂ is

If this equation is differentiated by time, an equation υG of the velocity of the center of gravity is obtained.

For example, when the law of conservation of momentum holds as in the case of collision, the velocity of each object before collision and the velocity of the center of gravity are υ ₁ , υ ₂ , υ G, and the velocity of each object after collision and the velocity of the center of gravity υ ₁ ' Since 1 ₂ 'and υ G', m ₁ υ ₁ + m ₂ υ ₂ = m ₁ υ ₁ '+ m ₂ υ ₂ ' holds,

That is, when the law of conservation of momentum holds, the velocity of the center of gravity is constant. In other words, when the external force does not work, the law of inertia holds with respect to the center of gravity. As a result, it is desirable for the golf club to be lightweight and to have a high head speed.

  On the other hand, by forming the crown portion, which is one of the outer sides of the golf head main body, from a carbon fiber reinforced plastic or a nanocellulose-containing plastic, it is possible to suppress an increase in the total weight of the head due to the arrangement of the repelling device and to reduce the weight. Furthermore, since the weight on the sole side is relatively increased by resinifying the crown portion, it is possible to lower the center of gravity of the club head.

  In addition, the repulsive arch type pole is made of titanium or lightweight magnesium hollow pipe, and in the case of magnesium, the arch type pole of the repulsive stopper portion is set at the position of the pole after passing through the ring made of titanium. Is desirable.

  Further, it is desirable that the end of the convex portion be in close contact with the annular groove of the face surface as much as possible and set.

  Further, in order to press when setting the convex portion on the back side of the face surface, it is desirable to form so as to avoid abrasion of the face surface friction portion.

  In order to solve the above-mentioned problems, the wood type golf club head according to the present invention comprises a face portion for hitting a ball, the inner surface of the face is made into a secret state in the repulsive stopper, and it is abutted from behind. The main point is that the arched pole supports the ball against the impact that it collides with, so that the pressure caused by the collision is repelled by the ball.

  By forming a striking plate formed with a central thick portion and an annular groove as a separate component from the face portion of the golf club head, and adhering to the face portion so that the striking plate and the surface of the face portion are flush. For example, providing a golf club that is most suitable for a golfer by forming the striking plate and the face portion with different materials to change the deflection performance at the time of striking and changing the combination of the striking plate and various golf clubs. Can.

  When the central thick portion and the annular groove are formed on the inner surface of the face portion of the wood type golf club head having a capacity of 460 cc, the diameter of the circular central thick portion and the annular groove is It is possible to increase the size, and therefore, it is possible to sufficiently bend the face portion at the time of hitting a ball, and it is possible to improve the resilience performance of the head, and therefore the flight distance can be increased.

  When the central thick portion and the annular groove are formed on the inner surface of the face portion of an iron-type golf club head, even the iron club can improve the resilience performance of the head by bending the face portion at the time of hitting. As a result, it is possible to improve the resilience performance of the head in the same manner as a wood-type golf club head, and therefore the flight distance can be increased.

  If a recessed regulating plate is provided on the inner side of the central thick portion and the annular groove, the annular groove is displaced and flexed by the ball hitting the ball, so that the central thick portion shifts to the inner side of the face portion from the face surface. Since excessive depression can be suppressed, even if a large number of balls are hit, it is possible to maintain the resilience performance of the head.

FIG. 1 is a front view of a wood-type golf club head showing an embodiment of the present invention. It is a longitudinal cross-sectional view of the golf club head shown in FIG. It is the principal part expanded sectional view of the (A) face part of the golf club head shown in FIG. 1, (B) It is an enlarged view of a music wire. It is a perspective view of the face part of the golf club head shown in FIG. FIG. 7 is a front view of another embodiment of a golf club head according to the present invention. FIG. 6 is a cross-sectional view showing a hitting plate of the golf club head shown in FIG. 5; It is principal part sectional drawing which shows the state of an annular groove when (A) ball hitting before and (B) ball hitting in the center thick part of a face part. FIG. 6 is a top perspective view of the inside of the golf club head shown in FIG. 5; 1 is a front view of an iron-type golf club head illustrating an embodiment of the present invention. FIG. 10 is a cross-sectional view of the golf club head shown in FIG. 9; (A) and (B) are explanatory drawings explaining the conventional head. FIG. 6 is a top view of a sole portion of the golf club head shown in FIG. 5; It is a front view of a repulsive arch type pole.

  A golf club head having a face portion for hitting a ball according to the present invention, wherein an inner surface of the face portion is a circular central thick portion having a predetermined thickness with a sweet spot point as a center point of the face portion. And an annular groove formed to surround the outer edge of the central thick portion, the outer edge side of the annular groove forms a wall surface substantially perpendicular to the face portion, and the bottom portion of the annular groove and the The thickness between the face portion is 0.1 mm to 0.9 mm.

  Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 1 shows an embodiment applied to a wood type golf club head. A golf club head (hereinafter abbreviated as "head") 1 includes a face 2 for hitting a ball, a crown 3 forming an upper surface of the head, a sole 4 forming a bottom of the head, a crown 3 and a sole A side portion 5 forms a side surface of the head, and a cylindrical neck portion 6 on which a shaft (not shown) is mounted. The head 1 is made of a metal material and is configured in a hollow wood type.

  The wood type golf head club according to the present invention is formed on the inner surface of the face portion for striking a ball with a repulsion device and an arched pipe for supporting it, and is disposed as a push support. The repulsion device can obtain a repulsion force by depressing the depression of the face surface and pushing the ball back by the uneven portion of the face surface and bringing the face portion and the lid of the repulsion device into contact at the center portion of the face.

  The wood type golf head club according to the present invention comprises a face portion for striking a ball, and the inner surface of the face portion is pressed by the abutment of an arched pipe supporting a repulsion device to strike the ball against the face portion. The resilient deformation is received by the repelling surface of the repelling apparatus with a gap that prevents metal breakage, and the striking pressure is applied by the repelling apparatus stopper.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 1 has a groove of 0.1 mm to 0.9 mm on the inner side of the repelling face disposed in the head body 1. The groove width is narrow, and the outer periphery of the groove is surrounded by a wall of 3 mm to form a protective wall that does not extend a crack over the entire face, and is formed so that the groove is closed and not broken if the impact exceeds the strength design assumed structure. Ru. At the same time, it is desirable to limit the use of head speed limit points below 50 m / s. In addition, since the repulsive arch type pole which prevents breakage of the groove on the back surface of the face is formed in a cylindrical shape, the inner surface is hollow, and the hollow space is a metal body including the groove and the lid Sealed body. To place it as a lid against the wall, the lid and the wall are constructed in consideration of the sealing condition including welding, in order to abut against the repulsive arch type pole and to prevent the impact destruction by the impact and to repel at the same time ing.

  As shown in FIG. 2 to FIG. 4, a groove is provided on the back face side of the repelling face, and a hole for receiving a repelling arch type pole which should be called a pressing device formed for the repulsion of the ball at the same time Is provided on the head sole, and the welding and installation at the root of the pipe with a mounting aid is part of the inner surface that constitutes a strong, resilient arch-type pole that serves as a stopper. The repulsive arch type pole is formed from a groove of 0.1 mm to 0.9 mm engraved on the face surface to prevent breakage and at the same time, to repel impact upon striking, and the total weight of these is within 100 g. However, the club head of 460cc.

The figure in Fig. 3 shows a repulsive arch type pole, but there is also pipe strength, and as a result of experiments in which materials are made of titanium alloy or other materials, in the case of magnesium alloy, rod shape of 15 mm, 25 mm and others titanium pipe specifications The magnesium alloy and the titanium alloy have the same weight, but the rigidity is the magnesium alloy and the pressing is the titanium alloy. Therefore, the magnesium alloy is suitable for long-term use.

Moreover, although the repulsive arch type pole is attached, the impact at the time of the collision received by the groove needs the formation which can endure the repeated impact, and it devises as mentioned above about all methods. From the circumference of the groove on the face surface, the face part, sole part and crown part are formed by welding, and the rigidity of the face part is naturally heat treatment by welding depending on the distance to reach the crown part. In order to prevent the rigid step, it is necessary to adjust the thickness, and the smooth slope and the step are set. In conclusion, it is ideal that the distance from the groove of the face to the left and right senses of the crown and sole and the left and right body be equal, which is the decisive factor of the breakage prevention.

  In addition, it is preferable that a thick portion is provided at the center of the repelling apparatus of the face portion and an annular groove is formed to surround the outer edge of the thick portion, which coincides with the center of the sweet spot point of the face portion. In this embodiment, the head thickness is increased or decreased by the initial striking speed of the ball generated when the ball strikes the central portion, and the thickness of the central thick portion, the width of the annular mold wall surrounding the outer edge, and the thickness. It can also be provided to players of 50 m / s or more. This requires that the head weight not be increased. The head design includes the circumference of the face, the crown, the sole and the body, and does not exceed 100 g in order to eliminate the problem of golf club balance and the poor swing-out due to weight.

  The repulsion device of the face part forms a central thick part and an annular groove, and by making the diameter of the circular shape as large as possible, the face part can be maximally bent at the time of striking to improve the head repulsion performance and fly distance. It is possible to increase

  However, the distance to the left and right of the body is necessarily greater than the circumference of the groove on the face with respect to the distance between the crown and sole, and the vibration of the plate wave by the shock wave of the face is on the left and right body. It is necessary to strengthen the rigidity of the face portion at the crown portion and the sole portion so as to generate a face plane front and back wave more though it is transmitted by a transverse wave. In a general manufacturing method in which the face, crown, and sole parts are constructed by welding, the setting of the above-mentioned thickness reduction processing, smooth slope and step also requires a more smooth method using chemicals. .

  The above-described head has been described by taking a wood-type golf club head as an example, but the present invention is not limited to such a form, and can be applied to iron-type and utility-type heads, etc. It is. Among the iron types, the number 7 iron is relatively easy to swing and the shaft length is relatively suitable for use when a distance is required.

  FIGS. 9 and 10 show an embodiment in which the present invention is applied to an iron type golf club head. The iron type golf club head (hereinafter abbreviated as "iron head") 11 shown in FIGS. 9 and 10 is a general structure, and the detailed description thereof will be omitted, but an outline of the structure necessary for the present invention will be described. explain.

  The iron head 11 comprises a head body 12 and a hosel portion 13 for inserting and fixing a shaft. The head body 12 has a face member 14 fixed to the front side. The face member 14 and the head body 12 are both made of a metal material. For the face member 14, a metal material having a specific gravity smaller than that of the head body 12 is used. The metal material used for the face member 14 is preferably, for example, titanium, titanium alloy, aluminum alloy, maraging steel or amorphous alloy, but in the case of magnesium alloy, it is relatively light and has a thickness for maintaining strength. In particular, titanium alloys or aluminum alloys of low specific gravity and high strength are preferred because they will be examined. Further, for the head body 12, for example, stainless steel such as SUS630, SUS255 or SUS450, maraging steel, Ni-based alloy or soft iron is preferable, and stainless steel, soft iron or maraging steel is particularly preferable.

  The face member 14 is formed with a substantially constant thickness tf except for the face line FL and the like. The face member 14 may have a thin peripheral portion and a thick central portion. The thickness tf of the face member 14 can be appropriately determined depending on the material to be used, and is not particularly limited. However, if it is too small, the durability tends to deteriorate, and if too large, sufficient deflection can be obtained when hitting a ball There is a tendency for the flight distance to decrease. Therefore, the thickness tf is preferably 1.0 mm to 4.0 mm.

  The head main body 12 is provided with a face receiving portion 15 on the front side around the opening. The face receiving portion 15 is formed in a substantially step-like cross section including an inner circumferential surface portion 15 a supporting the outer circumferential surface of the face member 14 and a receiving surface 15 b supporting the peripheral edge portion of the face member 15. Then, the face member 14 is fitted into the face receiving portion 15 of the head main body 12 and is integrally fixed, for example, by bonding means such as bonding, press fitting, caulking, welding or screwing.

  Similar to the wood type golf club head described above, the face member 14 is formed with a circular thick central portion 14a and an annular groove 14b formed so as to surround the outer edge of the central thick portion 14a at the central portion. It is done. It is desirable that the central thick portion 14 a be centered on the sweet spot point S. Also, in this embodiment, the thickness t5 of the central thick portion 14a is the same as the thickness of the face member 14, but the hitting of the ball is caused by the deflection produced when the ball strikes the central thick portion 14a. It may be increased or decreased by the initial speed.

  As shown in FIG. 10, the annular groove 14b formed at the outer edge of the central thick portion 14a is formed with a slope 14c inclined from the periphery of the central thick portion 14a toward the bottom of the annular groove 14b. A wall surface 14e substantially perpendicular to the face surface 14d of the face member 14 is formed on the outer edge side of the groove 14b, whereby the width of the cross-sectional shape is 0.1 mm to 0.3 mm and perpendicular to the wall surface. The thickness t6 between the bottom of the annular groove 14b and the face surface 14d is 0.1 mm to 0.9 mm. The central thick portion 14a and the annular groove 14b are substantially similar to the example of the wood type golf club head described above.

  Furthermore, the slope 14c also decreases the thickness smoothly from the peripheral edge of the central thick portion 14a toward the bottom of the annular groove 14b. This prevents the occurrence of a large rigidity step between the central thick portion 14a and the annular groove 14b, and effectively prevents the deterioration of durability due to stress concentration at the time of hitting a ball. In addition, you may form the slope 14c in concave shape in cross-sectional shape.

  Further, by forming the outer edge side of the annular groove 14b on the wall surface 14e substantially perpendicular to the face portion 2, the rigidity of the thick face portion 14 causes the annular groove 14 to be mainly bent, and as a result, It is the same as the example of the wood type golf club head described above to further improve the resilience performance and to contribute to increase the flight distance. Also in the iron type golf club head configured as described above, the ball striking plate illustrated in FIG. 5 or the depression regulating plate illustrated in FIG. 7 may be provided.

  However, iron is used from the assumption of flight distance, and wants limited flight distance, but it is easy to hit, for example, 7-iron when leaving a distance in a trouble scene when hitting a tee shot etc. In order to cover with an iron club, it is important to increase the flight distance of the iron part.

  As mentioned above, although this invention was concretely demonstrated based on the Example, this invention is not limited to the said Example, It can not be overemphasized that it can deform variously in the range which does not deviate from the summary. For example, in the embodiment described above, in order to set the center of gravity position of the wood type and iron type golf club heads to an appropriate position, the shape may be changed or a balance weight may be provided.

Reference Signs List 1 golf club head 2 face portion 2a central thick portion 2b annular groove 2c slope 2d wall surface 7 ball hitting plate 7a central thick portion 7b annular groove 7c wall surface 7d ridge 7e flange portion 10 depression regulating plate 11 iron head 14 face member 14a central thick Portion 14b annular groove 15 Reel arch type pole weld portion 16 Repel arch type pole insert 17 Repulsion arch type pole reinforcement plate 18 Music wire when mated

Claims (9)

A golf club head having a face portion for hitting a ball, comprising:
The inner surface of the face portion has a circular central thick portion having a predetermined thickness with the sweet spot point as the center point of the face portion;
An annular groove formed to surround the outer edge of the central thick portion;
The annular groove is formed with a slope inclined from the central thick portion toward the bottom of the annular groove, and the outer edge side of the annular groove forms a wall surface substantially perpendicular to the face portion. The width of the cross-sectional shape is 0.1 mm to 0.3 mm and perpendicular to the wall surface, and the surface is excavated in a straight line from the back surface at a position of 0.1 mm to 0.9 mm from the outside of the face surface. A thickness of 0.1 mm to 0.9 mm between the face portion and a ring of music wire made of 0.975 mm to 0.800 mm Swedish steel, which is also used as a piano string in this groove, A golf club head characterized in that it fits into an annular groove but can also be removed.   The golf club head according to claim 1, wherein the central thick portion and the annular groove are integrally formed on an inner surface of the face portion formed in a predetermined shape.   The central thick portion and the annular groove are formed on one side of the ball striking plate having a diameter larger than the annular groove having a predetermined thickness, and the outer edge side of the annular groove is substantially perpendicular to the ball striking plate. An annular ridge having a wall surface is formed, and the ball striking plate is fitted into a through hole formed in the face portion, and a flange portion formed around the periphery is fixed to the face portion, and the ball striking plate and the face portion The golf club head according to claim 1, wherein the surface of the golf ball is coplanar.   The golf club head according to any one of claims 1 to 3, wherein the central thick portion and the annular groove are formed on an inner surface of a face portion that strikes a ball of a wood type golf club head.   As described in claim 1, it is possible to predict damage or breakage of the face surface by digging or scraping the score line into the face surface which is a thin face surface because the thickness is 0.1 mm to 0.9 mm. In order to prevent them, it is necessary to apply paint to the face surface and to create a score line by scraping only those that have produced a coating layer or a chrome plating layer.   The vertical wall of the titanium alloy adjacent to the annular groove for preventing the damage of the annular groove in the central wall has a width of 1 mm to 10 mm, and the vertical wall collapses to the groove side due to the impact from the collision with the ball. Although the vertical wall tends to crush the groove and prevent breakage, the crush causes repulsion from the part, but it does not crush more than that. Further, as described in claim 1, by fitting a 0.975 mm to 0.800 mm music wire to the annular groove, a large tendency and depression of the face surface can be prevented and an arched pressing stopper which is a repulsion device. Although the other sealed repulsive device which is pressed is provided with a convex portion, when the convex portion strikes the music wire fitted in the annular groove or the impact due to the impact, they can be relieved from the shape of a round bar. As a result, it is confirmed that the ball is thrown away, and in order to protect or hold the portion for a long time, a lid is attached to the top of the wall, and the shape of the lid seals the entire annular hollow portion including the annular groove. A golf club head configured in a manner of providing.   The impact caused by the collision of the ball across the face is transmitted to the crown and the sole, and repulsion simultaneously occurs, but it is abutted against the sealed repulsion device on the back of the face so that the impact received on the face is strongly repelled. A golf club head formed with increased rigidity by providing an arched pressing stopper.   The golf club head according to any one of claims 1 to 3, wherein the central thick portion and the annular groove are formed on an inner surface of a face portion that strikes a ball of an iron type golf club head.   A rigid recess control plate is provided on the inner surface side of the central thick portion and the annular groove formed on the inner surface of the face portion, and this recess suppressing plate is hit by the transition of the central thick portion when hitting a ball. The golf club head according to any one of claims 1 to 5, wherein the golf club head is in contact with the center thick portion at all times.

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