JP2009160376A5 - - Google Patents

Description

Golf club head

This application is a continuation-in-part of US patent application Ser. No. 11 / 863,198, filed Sep. 27, 2007, which is incorporated herein by reference.
Other applications and patents relating to golf club heads are US patent application Ser. No. 11 / 871,933, filed Oct. 12, 2007, and US application Ser. No. 11 / 067,475, filed Feb. 25, 2005. All of which were filed on Jan. 31, 2007, U.S. Patent Application No. 11 / 669,891, U.S. Patent Application No. 11 / 669,894, U.S. Patent Application No. 11 / 669,900, U.S. Pat. No. 11 / 669,907, U.S. Patent Application No. 11 / 669,910, U.S. Patent Application No. 11 / 669,916, U.S. Patent Application No. 11 / 669,920, U.S. Patent Application No. 11/669, 925, and US patent application Ser. No. 11 / 669,927, which is a continuation-in-part of US patent application Ser. No. 10 / 785,692, filed Feb. 23, 2004. U.S. Patent No. 7,186,190, U.S. Patent Application No. 10 / 290,817, which is a continuation-in-part application, currently U.S. Patent No. 7,166,040, currently U.S. Patent No. 6,773,360 Including. These applications are incorporated herein by reference.

The present application relates to a golf club head, and more particularly, to a golf club head incorporating a function having a high tolerance when the hit point is deviated from the center , although there are other advantages. Moment of inertia, inverted cone technology, and Ru unique combination is described Tei of club head face characteristics.

Manufacturers and designers of the golf club head is constantly seeking ways to improve the performance of the golf club head, it, while having an aesthetic appearance, and has a tolerance of the golf club head. In general, "tolerance" is, miss-hit, ie the ability of the golf club head to reduce the influence of the golf ball flying line and flying distance of the ball due to the fact that hitting a golf ball at a position deviated from the sweet spot on the golf club head Can be defined as

The performance of a golf club head can be directly affected by the moment of inertia of the club head. The moment of inertia is the magnitude of the club head's resistance to torsion about the center of gravity of the golf club head at the time of impact with the golf ball. In general, when the moment of inertia of a golf club head is relatively large , the golf club head has less torsion upon impact with the golf ball, particularly during an “off-center” impact with the golf ball, and the golf club head the probability of hitting the tolerance and straight golf shots will be higher. In addition, greater moment of inertia, usually results in a faster ball speed by impact with a golf club head, it is that connected to the increase of the golf shot distance.

Generally, the inertia moment about a predetermined axis is proportional to the square of the distance to the shaft or RaTadashi amount. In other words, the moment of inertia of the mass around the distance to the given axis or al mass is greater than the predetermined axis is greater. Accordingly, golf club head designers and manufacturers can increase the distance of the head's mass from the subject axis, thereby increasing the axis of one or more golf club heads, typically the axis that passes through the center of gravity of the golf club head. Has been trying to increase the moment of inertia centered around .

In order to increase the tolerance of the golf club head, there is also the manufacturer of the golf club head, which has been working to focus with the size of the striking surface of a golf club head. In general, the larger the striking surface, the greater the tolerance of the golf club head. However, to increase the size of the striking surface to maintain the durability of the striking surface, it is usually necessary to increase the thickness of the face that defines the striking surface, eg, the face plate, which is the coefficient of restitution of the striking surface ( COR) that capability of the striking surface repel the ball, for example, a direct effect on the magnitude of the spring effect of the surface. In simplified form, COR is, United States Golf by measurement of the golf ball speed and club head speed that conforms to the guidelines of the Association, at the time of impact with a golf ball, hit in the club head to the speed of the club head It can be expressed as a percentage of the speed of the golf ball immediately after sagging.

United States Golf Association (USGA) regulations and constraints on golf club head shape, size, and other characteristics tend to limit the moment of inertia and COR obtained by the golf club head. According to the latest edition of the USGA regulations, golf club heads are particularly simple in shape and below the maximum envelope dimensions (maximum 2.8 inch height, maximum 5.0 inch width, and maximum 5.0 inch depth). has envelope dimensions, must Tei has the following volume head volume of up to 470 cm ^3. It should be noted that the body volume limit of the maximum 470 cm ³ is that far below the volume of the largest envelope dimensions. It should be noted that, USGA limit of 470 cm ³ is to include an allowable range of 10 cm ^{3 (ie, 460cm 3} + 10cm 3). Furthermore, USGA regulations, it COR value is less than 0.830, or 257 you are required to have a vibration characteristic time of less than microseconds (PCT). Such a specified C OR and PCT limit each include a tolerance.

Golf club manufacturers often face the option of improving one performance characteristic at the expense of another. For example, there had place the emphasis on increasing the moment of inertia at the expense of increase in the size of the striking surface in order to increase the tolerance, also conventional golf club head. These golf club heads, the portion as much as possible of the mass of rubber Ruff clubhead is away from the centroid. However, due to mass limitations due to trying to achieve the desired swing weight (eg, the driver's club head mass typically ranges from about 185 g to about 215 g), more mass can be distributed far from the center of gravity. greater the mass becomes smaller, which can be used for the face. The smaller usable mass on the face limits the thickness of the golf club head face and hence the size of the club head striking surface in order to remain within the USGA constraints defining COR and PCT. Thus, in these conventional golf club heads, tolerance of the head, which can cause enhanced by increasing large moment of inertia, is limited by constraints imposed for the size of the striking surface of the golf club head.

On the contrary, put in order to increase the tolerance, and to potentially sacrifice also and desirable center of gravity ( "CG") characteristics at the expense of the increased size of the moment of inertia, the emphasis on the increase in the size of the striking surface of golf club head There are also conventional golf club heads. As noted above, in conventional face designs, the larger the striking surface size, the thicker and heavier the face must be to comply with USGA constraints. The face of the mass is greater than, typically, the mass closer to the center of gravity is larger, the mass of such discretionary mass available for transfer from the center of gravity is smaller. Thus, in these conventional golf club heads, head tolerance can be increased by increasing the size of the striking surface, but is limited by the resulting constraints on the achievable moment of inertia.

As noted above, golf club designers and manufacturers have sought to design USGA compliant golf club heads that have both a high moment of inertia and a large striking face size for improved tolerance .

The present application discloses a golf club head that solves at least the aforementioned problems and provides, among other things, improved tolerances .
The present application, a golf club head having a body defining an internal cavity is described. Are also the golf club head comprises a sole provided on a bottom portion of the golf club head, a crown which is provided at the top, and a skirt provided on the outer periphery between the sole and the crown Nde contains . Body also have a front and rear. Furthermore, the golf club head includes a face which is provided on the front of the body, the face defines a striking face having an ideal impact location as a base point of the golf club head. Origin of head, and the x axis is substantially parallel for the and ground extending tangentially against the face when the head is ideally positioned, when the head is ideally positioned for the x-axis has a y-axis is substantially parallel to the substantially perpendicular and ground, and a z-axis is perpendicular against the both the x and y axes. the positive direction of the x-axis is a direction toward the heel from the toe, the positive direction of the y-axis is the direction from front to back, positive direction of the z axis is a direction towards the crown from the sole.

According to a first aspect, the present application, the golf club head is disclosed greater than the moment of inertia around the centroid z-axis substantially parallel golf club head origin z-axis of the head is about 490 kg · mm ^2. The face is within a first range of about −10 mm to about −50 mm and a second range of about 10 mm to about 50 mm of a head that is t _min to t _max for at least 50% of the x-axis coordinate x. Having a thickness along the origin x-axis ,

および

and

である。

It is.

Thickness of the first portion of the face in each of the first range and the second range, the than the second portion of the face in each of the first range and the second range, at least about 2mm has magnitude .

In some cases, the thickness of the face is within the first and second ranges are from _{t min} and _{t max} for at least 80% of the x-axis coordinate x.
In the golf club head according to the first feature, the moment of inertia about the center of gravity x-axis of the golf club head substantially parallel to the base x-axis of the head is greater than about 280 kg · mm ² .

Golf club head according to the first feature, and z-axis coordinate of about 6.0mm from the x-axis coordinate of about 0.0mm are have a center of gravity of from about 0.0mm to about -6.0Mm.
In some embodiments, the area of the striking surface is from about 35,000Mm ² to about 4,500 mm ^2.

Further, Thickness along the origin z-axis of the face of the head, in a fourth range from the third range and about 10mm from about -10mm about -30mm about 30 mm, at least 50% of the z-axis coordinate z Ri _{t max} der from _{t min} for, at this time,

および

and

である。

It is.

According to a second aspect, the present application, the golf club head is disclosed greater than the moment of inertia about the center of gravity x-axis generally parallel golf club head origin x-axis of the head is about 280 kg · mm ^2. The thickness along the origin z-axis of the head of the face is t relative to at least 50% of the z-axis coordinate z in a first range of about −10 mm to about −30 mm and a second range of about 10 mm to about 30 mm. Ri _{t max} der from _min, at this time,

および

and

である。

It is.

Oite golf club according to the second feature, Thickness of the first portion of the face in each of the first range and the second range, the face in each of the first range and the second range It is at least about 2 mm larger than the second part.

Thickness of the face is within the first and second ranges are from _{t min} and _{t max} for at least 80% of the z-axis coordinate z.
Area of the striking face of a golf club according to the second aspect is from about 3,500 mm ² to about 4,500 mm ^2.

The thickness along the origin x-axis of the face of a golf club according to the second aspect, in the fourth range from the third range and about 10mm from about -10mm about -50mm about 50 mm, at least the x-axis coordinate x _{t max} der from _{t min} for 50% is, at this time,

および

and

である。

It is.

In some embodiments according to the second aspect, the inertial moment about the center of gravity z-axis generally parallel golf club head origin z-axis of the head is greater than about 490 kg · mm ^2. Some embodiments and z-axis coordinate x-axis coordinate is from about 0.0mm to about 6.0mm are have a center of gravity of from about 0.0mm to about -6.0Mm.

In accordance with the third feature, the present application includes a golf club head having a moment of inertia greater than about 490 kg · mm ² that is substantially parallel to the base point z-axis of the head and substantially about the head base point x-axis. moment of inertia about the center of gravity x-axis parallel golf club head is greater than about 280 kg · mm ^2, the golf club head is disclosed. The golf club head has a thickness along a radial axis that extends tangentially and radially outward from a base point of the golf club head, the thickness being about 10 mm or more and about 50 mm or less. along at least 50% distance r from the base point of the golf club head along a radial axis located from _{t min} in the range of _{t max,} this time,

および

and

である。

It is.

Hitting area of the golf club head according to the third aspect is about 3,500 mm ² to about 4,500 mm ^2. Golf club head according to the third feature, and z-axis coordinate of about 6.0mm from the x-axis coordinate of about 0.0mm are have a center of gravity is from about 0.0mm to about -6.0Mm.

Accordingly to a fourth aspect, Ru Tei large golf club head than the moment of inertia about 500 kg · mm ² around the center of gravity z-axis generally parallel golf club head origin z-axis of the head is disclosed. Face of the golf club head according to the fourth aspect, have a flexural rigidity along the origin x-axis of the head, the bending stiffness is about -10mm from the first range and about 10mm to about -50mm to about 50mm Within the second range, BS _min to BS _max for at least 50% of the x-axis coordinate x , where

および

and

である。

It is.

In some instances due to the fourth feature, the face has a thickness along the origin x-axis of the head, the thickness of the third range and about 10mm from about -10mm about -50mm Within a fourth range of about 50 mm from t _min to t _max for at least 50% of the x-axis coordinate x ,

および

and

である。

It is.

The face is along the origin z-axis of the head may have a thickness, said thickness is within the range of about -10mm from third range and about 10mm to about -30mm fourth of about 30mm , From t _min to t _max for at least 50% of the z-axis coordinate z ,

および

and

である。

It is.

Area of the striking surface may be from about 3,500 mm ² to about 4,500 mm ^2.
The golf club head can have a center of gravity with an x-axis coordinate of about 0.0 mm to about 6.0 mm and a z-axis coordinate of about 0.0 mm to about −6.0 mm.

In the golf club head according to the fifth feature, the moment of inertia about the center of gravity x-axis of the golf club head substantially parallel to the base x-axis of the head is greater than about 280 kg · mm ² . Face has a bending stiffness along the origin z-axis of the head, the bending rigidity is in the second range from the first range and about 10mm from about -10mm about -30mm about 30 mm, z-axis BS _min to BS _max for at least 50% of the coordinate z , where

および

and

である。

It is.

Golf club head according to the fifth feature, along the origin x-axis of the head and have a thickness, said thickness is between about -10mm from third range and about 10mm to about -50mm to about 50mm Within the fourth range, t _min to t _max for at least 50% of the x-axis coordinate x , where

および

and

である。

It is.

Face in some embodiments, has a thickness along the origin z-axis of the head, the thickness is about -10mm from third range and about 10mm to about -30mm fourth of about 30mm Within the range, from t _min to t _max for at least 50% of the z-axis coordinate z , where

および

and

である。

It is.

Area of the striking surface may be from about 3,500 mm ² to about 4,500 mm ^2.
Golf club head according to the fifth aspect is, x-axis coordinate is from about 0.0mm to about 6.0mm and z-axis coordinates may have a center of gravity from about 0.0mm to about -6.0Mm.

Foregoing and other Features and BiToshi point of the golf club head would that Do more apparent from the following detailed description which is made with reference to the accompanying drawings.

In the following description, specific terms such as “upper”, “lower”, “upper”, “lower”, “horizontal”, “vertical”, “left”, “right” may be used. These terms are used to provide some clarity of explanation where appropriate when dealing with relative relationships, particularly with respect to the illustrated embodiments. However, these terms are not intended to imply absolute relationships, positions, and / or directions. For example, with respect to the object, the "top" surface, simply, ing in by the turning over of the object "bottom" surfaces. Nevertheless, it is the object of the same.

As shown in FIGS. 1-8, a wood type (eg, driver or fairway wood) golf club head, such as golf club head 2, includes a hollow body 10. Body 10 defines an internal cavity 79 (see Figure 7-8), a crown 12, a sole 14, a skirt 16, the striking face or face portion 18 and Nde free. Body 10 has Nde including a hosel 20, hosel body 20 defines a hosel bore 24 is configured to accommodate a golf club shaft (see Figure 6). Body 10 has a heel portion 26, toe portion 28, a front portion 30, and the Nde further including a rear portion 32. The golf club head 2 is equal cubic centimeter displacement of the club head 2 (cm ³⁾ that has have a volume that is typically measured. In some embodiments, the golf club head 2 has a total mass of a volume of about 400 cm ³ to about 490 cm ^3, and from about 185g to about 215 g. Referring to FIG. 1, in one specific embodiment, the golf club head 2, that have have a total mass of a volume of about 458cm ^3, and about 200 g.

The crown 12 is (1) when viewed from above and below, above the peripheral contour 34 of the golf club head 2, and (2) of the golf club head 2 at the rear of the top of the ball striking face 22 of the striking face 18. Ru Tei is defined as an upper (see Figure 6). The ball striking surface 22, a front surface of the striking face 18 or are defined as the external surface, Ru Tei is configured to impact the golf ball (not shown). In some embodiments, as described more fully below, the striking face or face portion 18, using conventional joining techniques such as welding, Ru striking hammer plates der that is joined to the body 10. In some embodiments, the ball striking surface 22, that have a rolled curved portion'm Rise et al. For example, referring to FIGS. 5 and 6, the ball striking surface 22 is have a rolled bend I Rise et a radius of about 305mm, respectively.

Sole 14, when the club head is X-axis and Y-axis is parallel to the ground surface, i.e., on a horizontal plane, when in the proper address position relative to the golf ball, on the lowest point or al of the club head Ru is the field constant in the bottom of the golf club head 2, which extend toward Tei. In some embodiments, the sole 14 extends from about 50% of the distance to the lowest point or easier rounding 12 of the golf club head 2 to 60%, which, in some cases, if the driver about 15 mm, and in the case of Fairway Ru 12mm der about 10 mm.

A golf club head, such as club head 2, is in the proper address position when the hosel 20 or the longitudinal axis 21 of the shaft is substantially perpendicular to the target direction and at the proper lie angle, then The score line is substantially horizontal (eg, approximately parallel to the ground 17) and the face angle is approximately square with respect to the target line (eg, a vector perpendicular to the geometric center of the ball striking surface 22). The horizontal component is facing the target line). If the faceplate 18 is not have a horizontal score lines, suitable lie angle 19 is set to be about 60 degrees. Loft angle 15 includes a face 27 which is defined as the tangent plane against an ideal impact location 23 on the ball striking surface 22, against the ground surface 17 when the golf club head 2 is in the appropriate address location of the it is an angle defined between the vertical surface 29 and. Lie angle 19, when the golf club head 2 is in the appropriate address location, hosel 2 0 or the longitudinal axis 21 of the shaft, the angle defined between the ground 17. In the present application, the ground 17 is Ru Tei is assumed to be water plane.

Skirt 16 includes a side portion of the golf club head 2 between the crown 12 and the sole 14, the side portion, the toe portion 28 except for the ball striking surface 22 around the rear portion 32 to the heel section 26 The golf club head 2 extends along the outer periphery 34.

In Tei to an embodiment is illustrated, ideal impact location 23 of the golf club head 2, Ru Tei disposed at the geometric center of the ball striking surface 22 (see Figure 4). The ideal impact position 23 is normally defined as the intersection of the midpoints of the height (H _ss ) and the width (W _ss ) of the striking surface 22. Both H _ss and W _ss are determined using the striking surface curve (S _ss ). The striking face curve face is to a substantially uniform bulge radius (curvature radius of the face from crown to sole) and a substantially uniform rolled radius (face radius of curvature from the heel to the toe) Body And the boundary of the outer surface is determined by all the points that shift (see, for example, FIG. 4). In Tei Ru embodiment shown, H _ss is (perpendicular to the ground) through the geometric center of the face is measured in a vertical plane, said from the peripheral edge adjacent to the sole portion of the S _{ss (striking} surface curve) S It is the distance to the periphery adjacent to the crown part of _ss . Similarly, W _ss passes through the geometric center of the face (parallel to the ground) is measured in the horizontal plane, the distance from the peripheral edge adjacent to the heel portion of the S _ss to the periphery adjacent the toe portion of the S _ss It is. See USGA “Procedure for Measuring the Flexibility of a Golf Clubhead,” Revision 2.0 for procedures for measuring the geometric center of the striking surface . In some embodiments the face i.e. the height of the ball striking surface 22 of the golf club head _{(H ss)} is from about 45mm to about 65 mm, a width _{(W ss)} is from about 75mm to about 105 mm. Referring to FIG. 4, in one particular embodiment, the ball striking surface 22 has a height (H _ss ) of about 52.2 mm, a width (W _ss ) of about 90.6 mm, and about 3,929 mm ² . which have a total strike area.

In some embodiments, the striking face 18 is provided with US Patent Application Publication Nos. 2005/0239575, and 2004/0235584, US Patent Application No. 11 / 642,310, and US Provisional Patent Application No. 60/877, Made of composite materials, such as those described in US Pat. No. 336, which are hereby incorporated by reference herein . In other embodiments, the striking face 18, the alloy (e.g., titanium, steel, aluminum, and / or magnesium) are made by a ceramic material or a combination of complex alloy and / or ceramic material.

The striking face 18 can be a striking plate of variable thickness as described in US Pat. No. 6,997,820, which is hereby incorporated by reference . For example, the indicated Tei so that in FIGS. 7 and 8, the striking face 18, Thickness defined between the inner surface 40 facing the ball striking surface 22 or the outer surface and the inner cavity 43 of the golf club head 2 and have a t. Striking face 18 includes a central portion 42 which is disposed adjacent to the ideal impact location 26 on the ball striking surface 22. The thickness t of the central portion 42 is substantially constant. Moreover, the striking face 18 is Nde contains an extending Biteiru diverging portion 44 from the central portion 42 outward radially. For example, see FIGS. Thickness t of the diverging portion 44, that has increased outward in the radial direction from the center. Striking face 18 has a converging portion 46 coupled to the diverging portion 44 through the transition section 48. Thickness t of the converging portion 46 is substantially reduced at the position of the radially outwardly from the diverging portion 44 and transition portion 48. In certain cases, the transition section 48 is the apex between the diverging portion 44 and converging portion 46. In other embodiments, the transition portion 48, and Thickness t extends radially outwardly from the diverging portion 44 is substantially constant (see Figure 9-11).

In some embodiments, in an ideal impact location 23, along the axis extending perpendicularly against the striking surface, the cross-sectional profile of the striking face 18, substantially as in the case of FIGS. 9-11 is there.

In other embodiments, the cross-sectional profile is can vary, for example asymmetric. For example, in certain embodiments, the cross-sectional profile of the striking face 18 along the origin z-axis of the head, the center as described above, transition, divergence, and includes the parts of convergence (Figure 9-11, And 13). However, along the origin x-axis of the head, the cross-sectional profile of the striking face 18, include a second diverging portion 47 that is connected to the converging portion 46 through the extension beauty and transition portion 49 radially from the converging portion 46 Can do. In an alternative embodiment, the cross-sectional profile of the striking face 18 along the origin z-axis of the head, as described above with respect to variation along the origin x-axis of the head, has led to and converging portion extending radially from the converging portion A second divergent portion can be included.

The thickness variation of the striking face 18 may be at a distance from the geometric center of the striking face along the axis thus determined. According to an exemplary embodiment, the minimum thickness t _min , the maximum thickness t _max , and the nominal thickness t of the striking face 18 along the base x-axis of the head within an effective range of 10 mm ≦ | x | ≦ 50 mm. _nom can be determined from the following equation:

Referring to FIG. 12, Ru Tei typical thickness profile obtained using equation 1-3 above is shown. About 0 mm ≦ | x | the portion of the striking face 18 of less than the effective range of ≦ 10mm is less impacts on COR face, the effective range starts from a position spaced about 10mm from the geometric center of the striking face 18 . However, in certain exemplary embodiments, the thickness t of the striking face 18 of less than the effective range is from about 2mm to about 5 mm, in some cases, Ru about 3mm der in the center 42. Also shown in Figure 12, there is shown a thickness profile for an exemplary embodiment of the striking face 18, said thickness profile bounded by t _min and _{t max} along the activated range 1 100% are determined That is, within that range .

As above, the minimum thickness t _min , the maximum thickness t _max , and the nominal thickness t _nom of the striking face 18 along the base z-axis of the head within an effective range of 10 mm ≦ | z | ≦ 30 mm are It can be determined by the equation

Referring to FIG. 13, Ru Tei typical thickness profile obtained using equation 4-6 above is shown. Similar to the effective range along the head origin x-axis, the effective range along the head origin z-axis is that the portion of the striking face 18 that is less than the effective range of about 0 mm ≦ | z | ≦ 10 mm affects the COR of the face. Since the influence is less , the effective range starts at a position about 10 mm away from the geometric center of the striking face 18. Also shown in Figure 13, there is shown a thickness profile for an exemplary embodiment of the striking face 18, said thickness profile bounded by t _min and _{t max} along the activated range 1 100% are determined That is, within that range .

In some embodiments, the above equations and constraints can be therefore defined radial distance from the base point of the golf club head 2. For example, minimum thickness _{t min,} the maximum thickness _{t max,} and nominal thickness _{t nom} of the striking face 18 may be determined by Thus the following equation to distance r from the origin of the golf club head 2.

In the formula, r is a distance from the base point of the golf club head 2 and is about 10 mm or more.
Compared with constant thickness of the face, nominal thickness profile along the x-axis and z-axis, and larger than meet COR constraints and USGA increased COR zone and the face to reduce the weight of the striking face 18 are tables a preferred thickness profile to provide more tolerant face. However, it is the same or different depending on the face having a thickness profile along the x-axis and z-axis that is bounded by a minimum and maximum thickness profile for each of the x-axis and z-axis along a predetermined portion of the effective range. Similar advantages can be obtained. For example, according to certain embodiments, the striking face 18 has a thickness profile along the origin x-axis that is bounded by a minimum and maximum thickness profile along at least 50% of the effective x-axis range. Can do. Similarly, the striking face 18 can have a thickness profile along the origin z-axis that is bounded by a minimum and maximum thickness profile along at least 50% of the effective z-axis range. In a more specific embodiment, the thickness profile of the striking face 18, at least 60% of the effective axial extent, 70%, the boundary is determined by the minimum and maximum thickness profile along 80%, or 90%.

In the embodiment shown, the striking face 18 of the golf club head 2, have a thickness profile along the x-axis (see FIG. 10) the thickness profile along the (see Figure 11) and z-axis It is . The thickness profile along the x-axis of the striking face 18, the boundary is determined by the minimum and maximum thickness profile along about 71% of the effective x-axis range. Similarly, the thickness profile along the z-axis of the striking face 18, the boundary is determined by the minimum and maximum thickness profiles along the effective z-axis range of about 65%.

In an exemplary embodiment, the striking face 18 is made by isotropic unitary material such as titanium. The flexural rigidity (BS) of an isotropic monolithic material is proportional to the elastic modulus (E) and thickness of the material and can be determined by the following equation:

In the formula, t is the thickness of the striking face 18.
Assuming elastic coefficient of titanium about ^{1.1 × 10 5 (N / mm} 2), about 10 mm ≦ | minimum head within the effective range of ≦ 50 mm origin x axis along the striking face 18 | x of the maximum, and nominal bending stiffness BS can be determined by the following equation.

Referring to FIG. 14-15, Ru Tei is shown a typical bending stiffness profiles obtained using equations 11-13. 0 mm ≦ | x | the portion of the striking face 18 of less than the effective range of ≦ 10mm is relatively small influence against the rigidity of the face, the effective range is a distance of about 10mm from the geometric center of the striking face 20 position starting from. However, in certain exemplary embodiments, the bending stiffness of the face 18 below the effective range is from about 9 × 10 ⁵ N · mm to about 1.40 × 10 ⁷ N · mm, and in some cases, in the central portion 42 of about 3.0 × Ru 10 ⁶ N · mm der. FIG. 14 also shows a bending stiffness profile for an exemplary embodiment of a striking face 18 that is bounded by BS _min and BS _max along an effective x-axis range of 100% .

Similarly, the minimum, maximum and nominal bending stiffness BS of the striking face 18 along the head's origin z-axis within an effective range of about 10 mm ≦ | x | ≦ 30 mm can be determined by the following equation ( Again, assume titanium having a Young's modulus of about ^{1.1 × 10 5 N / mm 2} ).

Referring to FIG. 15, Ru Tei is shown a typical bending stiffness profiles obtained using equations 14-16. The portion of the striking face 18 that is less than the effective range of about 0 mm ≦ | z | ≦ 10 mm has a relatively small effect on the stiffness of the face, so the effective range along the base point z-axis of the head is along the base point x-axis of the head. Similar to the effective range, it begins at a position about 10 mm away from the geometric center of the striking face 18. Also shown in Figure 14, are bending stiffness profiles shown for an exemplary embodiment of the striking face 18 bounded by the BS _min and BS _max along the activated z-axis range of 100% are determined.

Bending stiffness profile along the x-axis and z-axis, the thickness is compared with the predetermined face, and display the preferred bending stiffness profile for increasing the rigidity distribution to tolerance give a wider face. However, the same or similar advantages are that the bending stiffness profile along the x-axis and z-axis is bounded by the minimum and maximum thickness profiles for the x-axis and z-axis, respectively, along a predetermined portion of the effective range. it is obtained isosamples due to face with. For example, according to certain embodiments, the striking face 18 can have a bending stiffness profile along the origin x-axis that is bounded by minimum and maximum bending stiffness profiles along at least 50% of the effective x-axis range. . Similarly, the striking face 18 can have a bending stiffness profile along the origin z-axis that is bounded by minimum and maximum bending stiffness profiles along at least 50% of the effective z-axis range. In a more specific embodiment, the bending stiffness profile of the striking face 18, at least 60% of the effective axial extent, 70%, the boundary is determined by the minimum and maximum bending stiffness profiles along 80%, or 90%.

Because the bending stiffness profile will vary according to the thickness profile, the striking face 18 of the golf club head 2, by the effective x-axis range minimum and maximum bending stiffness profiles along approximately 71% of the x-axis bordered It is perforated along the bending stiffness profile. Similarly, the bending stiffness profile along the z-axis of the striking face 18 is bounded by minimum and maximum bending stiffness profiles along about 65% of the effective z-axis range as well .

As described above, Tei Ru bending stiffness profiles shown in FIGS. 14 and 15 were obtained for a golf club head having a face made from certain titanium alloys. However, since to achieve the above preferred bending stiffness profile tolerance characteristics golf club head and the same or similar any golf club head to be included within the scope of the already said tests, bending stiffness profile of FIG. 14 and 15, are tables also preferred bending stiffness profile for a golf club head having a face and possibly different thickness profile is made of a material other than the specific titanium alloy. For example, a golf club head having a face made from a material other than a tested titanium alloy, such as a different titanium alloy, a composite material, or a combination of both, may have a bending stiffness profile represented in FIGS. can be achieved to, for reasons of material composition of the face, may have a different thickness profile and Tei shall be represented in FIGS. 14 and 15. Even the thickness profile even can be different, recognizing a face to achieve the above-mentioned bending stiffness profile provides Ruff club head and the same or similar tolerance characteristics to achieve a thickness profile as described above for titanium face Is done . In certain embodiments, the flexural rigidity profile of a golf club head face made from a composite material, such as, for example, graphite epoxy or laminated metal, is the sum of the layers using methods commonly known in lamination theory. Can be obtained by thickness.

The crown 12, sole 14 and skirt 16 can be integrally formed using techniques such as casting, cold forming, casting and / or forging, and the striking face 18 is a means known in the art . Can be joined to the crown, sole and skirt. For example, the striking face 18 can be joined to the body 10 as described in US Patent Application Publication Nos. 2005/0239575 and 2004/0235584. The body 10 can be made from an alloy (eg, titanium, steel, aluminum, and / or magnesium), a composite material, a ceramic material, or some combination thereof. Wall 72 of the golf club head 2, made from thin wall structures such as those described in U.S. application Ser. No. 11 / 067,475, filed Feb. 25, 2005, which is incorporated herein by reference be able to. For example, in some embodiments, the wall thickness may be about 0.65mm to about 0.8 mm. In one specific embodiment, the thickness of the wall 72 of the crown 12 and the skirt 16 is about 0.65 mm, wall thickness of the sole 14 is about 0.8 mm.

Origin the coordinate system of the golf club head 2 is defined so that it can be determined the position of the various characteristics of the club head (e.g., including a club head center of gravity (CG) 50 (see Figure 5 and 6)) be able to. Referring to FIGS. 4-6, the base point 60 of the club head is Ru Tei represented on the golf club head 2. Origin 60 of the club head is positioned in an ideal impact location 23 or geometric center of the ball striking surface 22.

5 and 6, base coordinate system of the head, which is defined with respect to the base point 60 of the head, the base 60 of the head Tsu passing in a direction substantially perpendicular to the ground surface 17 when the golf club head 2 is in the address position and z-axis 65 which extends Te, substantially tangent against the ball striking surface 22 at the head of the base 60 through extending and namely ideal impact location 23 toward the heel from the substantially parallel tows to the striking surface 22 and x-axis 70 substantially perpendicular to and and z-axis 65 direction, the y-axis 75 substantially perpendicular to and and x-axis 70 and z-axis 65 extends through the base point 60 of the head in the front-3 One of which Nde including the axis. The x-axis 70 and y-axis 75, both extending Biteiru in a substantially horizontal direction with respect to the ground 17 when the golf club head 2 is in the address position. x-axis 70, extending Biteiru towards the origin 60 of the golf club head 2 in the heel portion 26 is in the positive direction. y-axis 75, it is towards the rear 32 extend in the positive direction from the origin 60 of the golf club head 2. z-axis 65, toward the base 60 to the crown 12 extends in the positive direction.

In one embodiment, the golf club head 2 has an x-axis coordinate of about 0.0 mm to about 6.0 mm , a y-axis coordinate of about 30 mm to about 50 mm , and a z-axis coordinate of about 0.0 mm to about − and possess CG the (center of gravity) is 6.0mm. Referring to FIGS. 5 and 6, in one specific embodiment, the x-axis coordinate of the centroid is about 1.8 mm, the y-axis coordinate of the centroid is about 37.1 mm, and the z-axis coordinate of the centroid is about − 3.3 mm.

Referring to FIG. 4, the golf club head 2 includes a lowermost point and an uppermost point on the outer surface of the body 10 measured along an axis parallel to the z-axis when the golf club head 2 is in the proper address position. Kurabuhe' de height maximum is defined as the distance between the (H _ch) and the heel portion 26 of the body being measured along an axis parallel to the x axis when the golf club head 2 is in the appropriate address location and the maximum range of the distance as defined by the maximum Kurabuhe' de width between the toe portion 2 8 (W _ch), measured along the axis parallel to the y axis when the golf club head 2 is in the appropriate address location and a maximum Kurabuhe' de depth (D _ch) or length defined as the distance between the frontmost point and the end point of the surface of the body 10 that. The height and width of the golf club head 2 are measured in accordance with USGA's “ Procedure for Measuring the Clubhead Size of Wood Clubs ” revised version 1.0. In some embodiments, the golf club head 2 has a height (H _ch ) of about 48 mm to 72 mm , a width (W _ch ) of about 100 mm to about 130 mm , and a depth (D _ch ) of about 100 mm. from about 130mm. In one specific embodiment, the golf club head 2 has a height (H _ch ) of about 60.7 mm, a width (W _ch ) of about 120.5 mm , and a depth (D _ch ) of about 106. it is .7mm.

Referring to FIGS. 5 and 6, the moment of inertia of the golf club head 2 is typically three axes that extend through the center of gravity 50 of the golf club head: (1) When the golf club head 2 is in the address position the center of gravity z-axis 85 extending through the center of gravity 50 in a direction substantially perpendicular to the ground surface 17, extends through the (2) the center of gravity 50 in the toe direction from the substantially parallel and heel to the ball striking surface 22 the cage and the center of gravity z-axis 85 barycentric x-axis 90 substantially perpendicular to, and (3) extends through the center of gravity 50 in the longitudinal direction and the center of gravity x-axis 90 and the center of gravity z-axis 85 barycentric y-axis 95 substantially perpendicular to, It is prescribed centering on. The center of gravity x-axis 90 and the center of gravity y-axis 95 both extend in a substantially horizontal direction with respect to the ground 17 when the golf club head 2 is at the address position.

Moment of inertia about the center of gravity x-axis 90 of the golf club head is calculated by the following equation.

In the formula, y is a distance from the xz plane including the center of gravity of the golf club head to the minute mass dm, and z is a distance from the xy plane including the center of gravity of the golf club head to the minute mass dm. Xz plane containing the center of gravity of the golf club head is a plane defined by the center of gravity x-axis 90 and the center of gravity z-axis 85 of the golf club head of the golf club head. Xy plane including the center of gravity is the plane defined by the center of gravity x-axis 90 and the center of gravity y-axis 95 of the golf club head of the golf club head.

The moment of inertia about the golf club head center of gravity z-axis 85 is calculated by the following equation:

In the formula, x is a distance from the yz plane including the center of gravity of the golf club head to the minute mass dm, and y is a distance from the xz surface including the center of gravity of the golf club head to the minute mass dm. Yz plane containing the center of gravity of the golf club head is a plane defined by the center of gravity y-axis 95 and the center of gravity z-axis 85 of the golf club head of the golf club head.

When the moment of inertia about the center of gravity z-axis (Izz) are representative of a capacity of the golf club head to resist twisting about the center of gravity z-axis, moment of inertia about the center of gravity x-axis (Ixx) is and it represents the ability of a golf club head to resist twisting about the center of gravity x-axis. The larger the moment of inertia (Ixx) centered on the center of gravity x-axis, the tolerance of the golf club head at the time of high or low off-center impact on the golf ball is greater. That is, when the golf ball is struck by a golf club head at a position above the ideal impact location 23 of the ball striking surface 18, twisted golf club head upward, causing the golf ball has a higher than desired trajectory . Similarly, when the golf ball is struck by a golf club head at a location below the ideal impact location 23 of the ball striking surface 18, twisted golf club head downward, causing the golf ball has a lower than desired trajectory Become. When the moment of inertia about the center of gravity x-axis (Ixx) increases, adverse effects due to the off-center impact at high position and low position twisting of upward and downward of the golf club head is mitigated is reduced.

When the thickness is compared with the relatively constant face design, the variable thickness of the hitting face 18, (1) Any weight big than, or preferably is disposed away from the center of gravity in order to increase the moment of inertia to make it possible to strategically positioned in order to obtain the center of gravity position, to reduce the mass for example the weight of the face without exceeding the COR constraint by USGA, in order to promote the (2) tolerance, striking face increasing the size, and (3) that compared with other parts of the face, increasing the face sweet spot of the COR zone for example a golf club head of the club head to provide a tolerance better golf shots, Is facilitated .

By weight of thickness is brought depending on the variable of the striking face 18, it can be utilized more large any weight to increase the moment of inertia of the golf club head 2. For example, in some embodiments, the moment of inertia around the centroid z-axis of the golf club head 2 (Izz) is about ^{490 kg · mm 2 ~ 600 kg} · mm 2, the center of gravity x-axis of the golf club head 2 moment of inertia about the (Ixx) is about 280 kg · ^mm 2 ~ about 420 kg · mm ^2. In one particular exemplary embodiment, as shown in FIG. 1, the moment of inertia around the centroid z-axis of the golf club head 2 (Izz) is about 528 kg · mm ^2, the center of gravity of the golf club head 2 inertia around the x-axis moment (Ixx) is about 339 kg · mm ^2.

As described above, such that a variable striking face thickness as the striking face 18, while maintaining and faces COR maintain the durability of the face within the limit of the USGA, that increasing the area of the striking face 20 to enable. The larger the face, the more area that can be used to contact the golf ball , and thus the greater the tolerance of the golf club head. Since the hitting face is the only part of the club that contacts the ball, the larger hitting face is one of the most important characteristics of a golf club. By providing a larger face, it minimizes the possibility of hitting the ball off the (e.g. result in orbit "tempura" ball) end of the face. Therefore, by the striking face is larger, the golfer Ru given a further confidence to beat a more aggressive ball.

A striking face with a variable thickness, such as the striking face 18 , increases the COR zone of the face and increases the tolerance of the golf club head. For example, referring to FIG. 16, Ru Tei is compared tolerance golf club heads having various combinations of inertia (Izz) around the face and the center of gravity z-axis of the fixed and variable thickness. For each golf club head configuration, Ru Tei ball speed of a golf ball was struck at various locations along the origin x-axis of the golf club head on the striking surface is shown. Off-center of the club head lowering of ball speed to pair less to blow, it is said that a greater promote tolerance. Each golf club head has a mass of COR, and 206g of the head of 0.820, the speed at impact with a golf ball was 109mph. These results are based on a model made of the club head using a commercially available finite element analysis tool ABAQUS. In the illustrated Tei so that, 600 golf club head having a Izz and constant thickness face of kg · mm ^2, the golf club heads having a face of but variable in thickness having a small Izz of 400 kg · mm ² It has similar tolerance characteristics. Further, 600 embodiment having a face of Izz and variable thickness of kg · mm ² is conducive accept larger than a golf club head having a large Izz and constant Thickness of the face of 800 kg / mm ^2.

This club head having a variable faceplate and 600 kg · mm ² Izz is not to say that with the actual moment of inertia about the z-axis of more than 600 kg · mm ² Thickness . On the contrary, "feel" of the club head, compare favorably to the golf club head having a large moment of inertia about the z-axis. Therefore, the club head having a thickness having a variable of the face plate and 600 kg · mm ² Izz, when considering the ball speed by hitting in the off-center, said to have an "effective MOI" of more than 800 kg · mm ² be able to. 600 kg · mm ² smaller than the actual MOI (e.g., ⁵⁹⁰ measurement tolerance of kg · mm 2 +10 kg · mm 2) club head having a (compared with the thickness is constant faceplate design) effective MOI is likely to be greater than 600 kg · mm ^2, but in practice it is thought to conform to the MOI rules USGA.

Referring to FIG. 17 to 22, thus to another exemplary embodiment, a golf club head 100 is used, the number and the crown 112 defining an interior cavity 157, a sole 114, a skirt 116, and a striking face 118 Is doing . Body 110, the hosel 120, a heel portion 126, a toe portion 128, front portion 130, a rear portion 132, and further Nde including an internal rib 182. Striking face 118 Nde including a ball striking face 122 facing outward with an ideal impact location at the geometric center 123 of the striking surface. In some embodiments, the golf club head 100 has a total weight from volume and about 185g of about 400 cm ³ to about 490 cm ³ to about 215 g. Referring to FIG. 17, in one specific embodiment, the golf club head 100 that are have a total mass of a volume of approximately 454cm ³ and about 202.8 g.

Unless otherwise specified, general details and characteristics of the body 110 of the golf club head 100 can be understood with reference to the same or similar characteristics of the body 10 of the golf club head 2.

In Tei to an embodiment shown, the face 118 of the golf club head 100, that have have a thickness profile along the x-axis (see Figure 21) and y-axis (see Figure 22). The thickness profile along the x-axis of the face 118 is bounded by minimum and maximum thickness profiles along approximately 100% of the effective x-axis range is determined. Similarly, the thickness profile along the z-axis of the face 118 is bounded by minimum and maximum thickness profiles along approximately 100% of the effective z-axis range is determined.

Because the bending stiffness profile will vary with the thickness profile, the face 118 of the golf club head 100, along the x-axis bounded by the minimum and maximum bending stiffness profiles along approximately 100% of the coaxial valid x-axis subtended Bending stiffness profile. Similarly, the bending stiffness profile along the z-axis of the face 118 is bounded by the minimum and maximum bending stiffness profiles along approximately 100% of the coaxial effective z-axis range is determined.

Sole 114 extends Biteiru from the lowest point of the golf club head 100, upwardly over a distance shorter than the sole 14 of the golf club head 2. For example, in some embodiments, sole 114 may extend upwardly to extend from the lowest point of the golf club head 100 in 60% to about 50% of the distance to the crown 112 Biteiru is, in some instances for for about 15 mm, Fairway the driver can be from about 10mm to about 12 mm. Further, the sole 114, Ru Tei comprises a substantially flat portion 119 that extends horizontally to the ground 117 when in the appropriate address locations. In some embodiments, the deepest part of the sole 114, the depth of the golf club head 100 _{(D ch)} substantially parallel to the extending Biteiru from about 5% to ground 117 for about 70%.

Since the sole 114 of the golf club head 100 is shorter than the sole of the golf club head 2, skirt 116 extending Biteiru over high i.e. longer substantially perpendicular distance back than the skirt 16 of the golf club head 2.

In at least one embodiment, the golf club head 100, are Nde including a weight port 140 formed in the skirt 116 of a position close to the rear portion 132 of the club head. (See Figure 19). Weights 140, which mentioned that the present application incorporated in Ru U.S. Patent Application No. 11 / 066,720 and EP 11 / are described in EP 065,772 Tei such so that Tei by the, many weights or weights assembly You can have any of Many various structures you accommodating and holding one.

In some embodiments, the striking surface 122 of the golf club head 100 has a height _{(H ss)} is from about 45mm to about 65 mm, a width _{(W ss)} is from about 75mm to about 105 mm. In one specific embodiment, the striking surface 122 has a height (H _ss ) of about 54.4 mm , a width (W _ss ) of about 90.6 mm , and a total strike area of about 4,098 mm ² . There is .

In one embodiment, the golf club head 100 has an x-axis coordinate of about 0.0 mm to about 6.0 mm , a y-axis coordinate of about 30 mm to about 50 mm , and a z-axis coordinate of about 0.0 mm to about −6. It has a center of gravity at a position of 0 mm. In one specific one embodiments, x-axis coordinates of the center of gravity is about 2.0 mm, y-axis coordinates of the center of gravity is about 37.9 mm, z-axis coordinate of the center of gravity is about -4.67Mm.

In some embodiments, the golf club head 100 has a height (H _ch ) of about 48 mm to about 72 mm , a width (W _ch ) of about 100 mm to about 130 mm , and a depth (D _ch ) of about it is about 130mm from 100mm. In one specific embodiment, the golf club head 100 has a height (H _ch ) of about 62.2 mm , a width (W _ch ) of about 119.3 mm , and a depth (D _ch ) of 103.mm. a 9mm.

According to certain exemplary embodiments, the golf club head 100 has a moment of inertia (Izz) about the center of gravity z-axis of about 490 kg · mm ² to about 600 kg · mm ² , and about 280 kg · mm ^2. and have a moment of inertia (Ixx) around the center of gravity x-axis of about 420 kg · mm ² from. In one specific embodiment, the golf club head 100 includes a moment of inertia (Izz) about the center of gravity z-axis of about 500 kg · mm ² and a moment of inertia about the center of gravity x-axis of about 337 kg · mm ^2. and have a (Ixx).

Referring to Figure 23 to 27 Then, in accordance with another exemplary embodiment, a golf club head 200 is provided with the same low profile skirt and body 10 of the body 110 and the golf club head of the golf club head 100 body 210 is provided . Body 210, the crown 212 defining an interior cavity 257, the sole 214, the skirt 216, the hitting face 218 and Nde free. Body 210, the hosel 220, a heel portion 226, a toe portion 228, front portion 230, and the Nde further including a rear portion 232. Striking face 218 is Nde including a ball striking face 222 facing outward with an ideal impact location at the geometric center 223 of the striking surface. In some embodiments, the golf club head 200, the volume is from about 400 cm ³ to about 490 cm ^3, the total weight is about 185g to about 215 g. Referring to FIG. 23, in one specific embodiment, a golf club head 200 has a volume of about 455cm ^3, the total mass of about 203.9G. In another particular embodiment, a golf club head 200 has a volume of about 444cm ^3, the total mass of the total mass of about 205.2 g.

  Unless otherwise specified, general details and characteristics of body 210 of golf club head 200 should be understood with reference to the same or similar characteristics of body 10 of golf club head 2 and body 110 of golf club head 100. Can do.

In Tei to an embodiment shown, the striking face 218 of the golf club head 200, that have have a thickness profile along the x-axis (see Figure 26) and the z-axis (see Figure 27). The thickness along the x-axis of the face 2 18 profiles are bounded by valid x-axis range minimum and maximum thickness profiles along approximately 100% of the is defined. Similarly, the thickness profile along the z-axis of the face 218, is delimited by the effective z-axis range minimum and maximum thickness profiles along approximately 100%.

Because the bending stiffness profile differ depending on the thickness profile, the striking face 218 of the golf club head 200, along the x-axis bounded by the minimum and maximum bending stiffness profiles along approximately 100% of the same effective x-axis range Bending stiffness profile. Similarly, the bending stiffness profile along the z-axis of the striking face 218 is bounded by the minimum and maximum bending stiffness profiles along approximately 100% of the same effective z-axis range is determined.

Like the sole 114 of the golf club head 100, the sole 214 extends Biteiru upwardly over a distance of about 50% to about 60% of the distance from the lowest point of the golf club head 200 to the crown 212. Therefore, the skirt 216 is higher than the skirt 16 of the golf club head 2, i.e. extending Biteiru over a longer substantially vertical distances.

In at least one embodiment, as shown in FIGS. 16, 18 and 20, the golf club head 200 is Nde contains a weight port 240 formed in the sole 114 proximate the rear portion 232 of the club head. Weights 240 may have any of many different structures that also accommodate and hold any of a number of weights or weights assembly. For example, the Tei so that the illustrated, weights 240 extend Biteiru upward substantially perpendicularly toward the wall 272 of the body 210 within the interior cavity 257.

In some embodiments, the striking surface 222 of the golf club head 200 is the height _{(H ss)} from about 45mm to about 65 mm, a width _{(W ss)} of approximately 105mm from 75 mm. In one specific embodiment, the striking surface 222 has a height (H _ss ) of about 53.5 mm , a width (W _ss ) of about 92.3 mm , and a total strike area of about 4,013 mm ² . is there. In another specific embodiment, striking surface 222 has a height (H _ss ) of about 54.7 mm, a width (W _ss ) of about 92.3 mm , and a total striking area of about 4,115 mm ^2. It is.

In one embodiment, the center of gravity of the golf club head 200 is about 6.0mm from the x-axis coordinate of about 0.0mm, about 50mm from the y-axis coordinate of about 30 mm, z-axis coordinate of about 0.0mm from about -6.0mm. In one specific embodiment, the x-axis coordinate of the center of gravity is about 2.2 mm, the y-axis coordinate of the center of gravity is about 37.9 mm, and the z-axis coordinate of the center of gravity is about -4.3 mm. In another specific embodiment, the x-axis coordinate of the centroid is about 2.8 mm, the y-axis coordinate of the centroid is about 35.8 mm, and the z-axis coordinate of the centroid is about -3.4 mm.

In some embodiments, the golf club head 200 has a height (H _ch ) of about 48 mm to about 72 mm , a width (W _ch ) of about 100 mm to about 130 mm , and a depth (D _ch ) of about it is about 130mm from 100mm. In one specific embodiment, the golf club head 200 has a height (H _ch ) of about 62.3 mm , a width (W _ch ) of about 120.0 mm , and a depth (D _ch ) of about 111. it is .6mm. In another specific embodiment, the golf club head 200 has a height (H _ch ) of about 62.6 mm, a width (W _ch ) of about 121.0 mm , and a depth (D _ch ) of about The depth (D _ch ) is 107.4 mm.

The golf club head 200, in some embodiments, has a moment of inertia (Izz) about the center of gravity z-axis of about 490 kg · mm ² to about 600 kg · mm ² and has an inertia about the center of gravity x-axis. moment (Ixx) is between about 280 kg · mm ² to about 420 kg · mm ^2. In one specific embodiment, the club head 200 has a moment of inertia (Izz) about the center of gravity z-axis of about 516 kg · mm ² and a moment of inertia (Ixx) about the center of gravity x-axis of about 354. a kg · mm ^2. In another specific embodiment, the club head 200 has a moment of inertia (Izz) about the center of gravity z-axis of about 496 kg · mm ² and a moment of inertia (Ixx) about the center of gravity x-axis is about. 329 a kg · mm ^2.

In view of the many possible embodiments to which it is possible to apply the principle of the golf club head disclosed herein, Tei to an embodiment is shown, a and range of the golf club head only preferred embodiments of the golf club head it is not to be considered as limiting it should be recognized. The scope of the invention is rather defined by the claims . Therefore, all included in the scope of the appended claims are claimed as the invention.

FIG. 1 is a side view of a golf club head according to a first embodiment. FIG. 2 is a front view of the golf club head of FIG. 3 is a bottom perspective view of the golf club head of FIG. Figure 4 is a front view of the golf club head of FIG. 1 showing the coordinate system of the origin of the golf club head. Figure 5 is a side view of the golf club head of FIG. 1 showing the coordinate system of the center of gravity. 6 is a plan view of the golf club head of FIG. FIG. 7 is a cross-sectional view of the golf club head of FIG. 1 taken along line 7-7 of FIG. FIG. 8 is a cross-sectional side view of the golf club head of FIG. 1 taken along line 8-8 of FIG. FIG. 9 is a rear view of the hitting face. FIG. 10 is a side cross-sectional view of the striking face of FIG. 9 taken along line 10-10 of FIG. 11 is a side cross-sectional view of the striking face of FIG. 9 taken along line 11-11 of FIG. FIG. 12 is a graph showing the change of the striking face thickness along the base x-axis of the club head. FIG. 13 is a graph showing a change in the thickness of the striking face along the base point z-axis of the club head. FIG. 14 is a graph showing changes in the bending stiffness of the striking face along the base x axis of the club head. FIG. 15 is a graph showing a change in the bending rigidity of the striking face along the base point z-axis of the club head. 16, the information on the various embodiments of the golf club head is a graph showing the change in loss of the ball speed by the impact position of the striking face. FIG. 17 is a side view of a golf club head according to the second embodiment. 18 is a front view of the golf club head of FIG. FIG. 19 is a bottom perspective view of the golf club head of FIG. FIG. 20 is a plan view of the golf club head of FIG. 21 is a cross-sectional view of the golf club head of FIG. 17 taken along line 21-21 of FIG. 22 is a cross-sectional side view of the golf club head of FIG. 17 taken along line 22-22 of FIG. FIG. 23 is a side view of the golf club head according to the third embodiment. 24 is a bottom perspective view of the golf club head of FIG. 25 is a plan view of the golf club head of FIG. 26 is a cross-sectional view of the golf club head of FIG. 23 taken along line 26-26 of FIG. 27 is a side cross-sectional view of the golf club head of FIG. 23 taken along line 27-27 of FIG.