JP2002315854A - Wood type golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand a sweet area while making an wood type golf club head light in weight and to easily make a golf ball fly in a desired direction. SOLUTION: A face member 14 of an wood type golf club head 10 is composed of steel and on one end face, thickness differences are provided by providing first-third projecting parts 16a-16c. Further, in such an wood type golf club head 10, the total weight is <=250 g, the inertia moment with a perpendicular axis L passing a center G1 of gravity of the relevant wood type golf club head 10 as a rotary axis is >=2700 g.cm<2> and a shortest distance (straight line M1) between the center G1 of gravity and the hitting surface of the face member 14 is specified to b >=25 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood type golf club head, and more particularly, to a wood type golf club head in which a face member is reduced in weight and a sweet area is enlarged.

[0002]

2. Description of the Related Art In recent years, golf clubs having a wide optimal hitting area (sweet area) have been demanded. This is because in such a golf club, the probability that the hit golf ball can fly in a desired direction increases.

[0003] As a method of expanding the sweet area,
For example, it is known to increase the moment of inertia by increasing the weight of the peripheral portion of the head body, and to increase the center of gravity by increasing the weight of the rear side of the head body. However, in any case, the weight of the golf club head is inevitably increased, and the golf club becomes difficult to swing. Therefore, in order to suppress an increase in weight due to an increase in the sweet area, it is customary to reduce the thickness of the face member to reduce its weight.

[0004]

However, the thickness of the face member cannot be extremely reduced. This is because, even when the golf ball is repeatedly hit, it is necessary to secure a certain level of strength in order to prevent the face member from being permanently deformed or damaged. Therefore, for example, when a face member for a wood type golf club head and made of steel is manufactured by a precision casting method, its thickness is set to 2.5 mm or more.
As will be understood from this, there is a limit to reducing the thickness of the face member, and it is difficult to suppress the weight increase while expanding the sweet area after all.

In view of the above, it is recalled that the thickness of the face member is increased so that the thickness is increased only in the central portion, which is the hitting area, and the thickness of the peripheral portion is reduced as long as the strength is secured. . However, structural defects such as internal pores are likely to occur in the cast molded product, and therefore, there is a concern that the resulting face member may have large variations in strength at locations where the thickness is reduced. Of course, a low-strength material is liable to be permanently deformed and cannot be provided as a commercial product. To eliminate this concern, no other method has been found until now except for increasing the thickness of the face member.
As a result, when the face member is manufactured by casting, a problem that it is difficult to suppress an increase in weight has become apparent.

In order to avoid such a problem, it is considered effective to produce a face member having a difference in wall thickness by forging. This is because a forged molded product has less structural defects than a cast molded product, and therefore, if it has the same strength, the wall thickness can be reduced.

However, in this case, when forging the work, the burrs protruding from the work often enter between the forging dies. When such a situation occurs, it becomes extremely difficult to bring the forging dies closer to each other, so that a portion having a small thickness cannot be obtained with a desired size.

In addition, even if the face member has a thickness difference, the golf ball may not always fly in a desired direction.

As described above, it is difficult to produce a face member having a desired thickness difference in thickness, and even if the thickness difference is provided, the golf ball can be surely held in a desired direction. It has been pointed out that it cannot fly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a wood type golf club head having a face member having a difference in wall thickness and allowing a golf ball to easily fly in a desired direction. The purpose is to do.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a golf ball having a hitting area having a maximum thickness at a central portion thereof and extending from the central portion of the hitting area toward a peripheral edge of a head body. A wood-type golf club head including a face member provided with a convex portion having a portion having a reduced thickness, wherein the face member is made of steel, and the total weight of the wood-type golf club head is 250 g or less, Moment of inertia about a vertical axis passing through the center of gravity of the type golf club head as a rotation axis is 2700 g · cm ² or more,
The shortest distance between the center of gravity and the striking surface of the face member is 2
It is not less than 5 mm.

A face member made of steel has excellent strength. Therefore, the sweet area can be enlarged while reducing the weight of the face member by reducing the thickness other than the hitting area.

In addition, by defining the total weight of the wood-type golf club head as described above, it is possible to avoid a slow swing speed when the player swings the golf club. The flight distance of the golf ball can be ensured. Also, by defining the moment of inertia and the shortest distance from the center of gravity to the striking surface of the face member as described above,
It becomes easy to fly the golf ball in a desired direction.

The face member has a steel work interposed between a first roll and a second roll, which have a concave portion having the largest depth at the central portion of the hitting area on the outer peripheral wall. Pressing the steel work with the second roll to provide the steel work with a thickness difference having a shape corresponding to the shape of the concave portion, and face-forming the steel work provided with the thickness difference with a mold. It is preferably formed by molding into a member. A face member manufactured by rolling or forging has higher strength than a face member manufactured by casting. Therefore, even if the thickness is reduced, it is possible to reliably secure the strength enough to withstand the impact when the golf ball is hit.

Here, preferred examples of steel include 10 to 2
5 wt% Cr, 10-20 wt% Co, 3-8
Alloy steels containing 18% by weight of Ni and 3 to 8% by weight of Mo, 18Ni maraging steel or precipitation hardening stainless steel can be given. The 18Ni-based maraging steel refers to 17 to 19% by weight of Ni and 7 to 19% by weight.
It refers to an alloy steel containing 9.5% by weight of Co and 3 to 5.5% by weight of Mo and age hardened by subjecting the martensite structure to aging treatment.

The precipitation hardening type stainless steel is not particularly limited, but a preferred example is 15.5 to 1
7.5 wt% Cr, 3-5 wt% Ni, 3-5
SUS630 stainless steel which contains Cu by weight and is precipitation-strengthened by aging treatment.

It is preferable that the face member has a portion whose thickness continuously decreases from the center of the hitting area toward the peripheral edge of the head body. In this case, the occurrence of stress concentration can be avoided, so that the face member is extremely unlikely to be damaged.

In any case, it is preferable that the face member has a substantially constant thickness from the center of the hitting area to the sole. In this case, the shot feeling at the time of hitting the golf ball becomes soft.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Several preferred embodiments of the wood type golf club head according to the present invention will be described below.
This will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a wood type golf club head according to a first embodiment of the present invention. In the wood type golf club head 10, a head body 12 and a face member 14 are joined to each other by, for example, welding. The face member 14 has an elliptical first convex portion 16.
a, the second convex portion 16b and the third convex portion 16c are formed in a step-like manner to provide a difference in thickness.

The head body 12, which is the main body of the wood type golf club head 10, is a hollow body manufactured by casting. The material for forming the head main body 12 is not particularly limited. For example, alloy steel, which will be described later, which is a material for forming the face member 14 can be exemplified.

On the other hand, the face member 14 is provided at a portion where a golf ball is hit, and is made of steel formed by a roll and a mold described later. Here, a preferable example of the steel is an alloy containing 10 to 25% by weight of Cr, 10 to 20% by weight of Co, 3 to 8% by weight of Ni, and 3 to 8% by weight of Mo. Steel can be mentioned.

This alloy steel includes Al, Ti, Cu, N
At least one element selected from the group consisting of b and Zr may be contained. This is because the presence of such an element further improves the strength of the face member 14. In addition, the ratio of the element is sufficiently 0.01 to 1.0% by weight. The alloy steel may further contain C, Si, Mn, and the like.

Another preferable example of the steel is 18N.
i-type maraging steel, SUS630 stainless steel, and the like. Further, Custom 450, Custom 455, Custom 46 from Carpenter Steel Co., Ltd.
5, and those sold under the trade name of Ahmet 100.

The rolled or forged steel has very few structural defects because the internal pores are crushed. Therefore, the first to third convex portions 16a to 16
Even when c is formed, it is possible to secure the strength of a portion having a small thickness. Therefore, the face member 1
The thickness of the wood-type golf club head 10 can be reduced by providing a thickness difference in the wood-type golf club head 4, and the sweet area can be enlarged.

The total weight of the wood type golf club head 10 is set to 250 g or less. If the weight exceeds 250 g, the swing speed of the golf club when the player swings the golf club is reduced, so that the flight distance of the hit golf ball is shortened. In particular, in a wood type golf club head for a driver, the total weight is desirably 220 g or less, and more desirably 195 g or less.

The moment of inertia of the wood type golf club head 10 is 2700 g · cm ² or more, for example, 2
It is set to 780 g · cm ² . If it is less than 2700 g · cm ² , it becomes difficult to fly the golf ball in a desired direction. Here, the moment of inertia is the center of gravity G of the wood type golf club head 10.
1 is obtained as a rotation axis.

Further, the shortest distance from the center of gravity G1 of the wood type golf club head 10 to the striking surface of the face member 14 is at least 25 mm, for example, 25.5.
mm. In this case, it is extremely easy to fly the golf ball in a desired direction. Note that the shortest distance is defined as the length of a straight line M1 starting from the center of gravity G1 and orthogonal to the hitting surface of the face member 14.

Setting the total weight, the moment of inertia and the shortest distance in the above ranges can be easily achieved by providing the face member 14 with the first to third convex portions 16a to 16c.

This wood type golf club head 10
According to the manufacturing method shown in the flow chart in FIG. 2, it can be manufactured as follows. This manufacturing method includes a deforming rolling or roll forging step S1 for providing a thickness difference to the steel work shown in FIG. 3, and a press or a mold for forming the steel work having the thickness difference on the face member 14. The forging process S2, the face member 14 and the head body 12
And a joining step S3 of joining the two. As the steel work 18, for example, a work made of the above-described alloy steel may be used.

First, in a rolling or roll forging step S1, as shown in FIG. 3, a plate-shaped steel work 18 is subjected to rolling or roll forging with a pair of deformed rolls 20a and 20b.

That is, the lower roll 20a
A concave portion 22 is provided in the outer peripheral wall portion of the
A first step portion 24a, a second step portion 24b, and a third step portion 24c are formed from the opening 2 to the bottom surface.
For this reason, the steel work 18 interposed between the two rolls 20a and 20b after being heated is provided with a portion formed into a shape corresponding to the shape of the concave portion 22 by being pressed by the roll 20b. . In short, as shown in FIG. 4, the first to third convex portions 16 a to 16 c having shapes corresponding to the first to third step portions 24 a to 24 c are formed so as to protrude from one end surface of the steel work 18. The steel work 18 has a thickness difference.

The temperature of the steel work 18 is controlled by the two rolls 20.
What is necessary is just to set it to the extent that it is quickly molded when interposed between a and 20b, and specifically, 800 to 1300 ° C.

Next, in a pressing or stamping and forging step S2, using a mold corresponding to the shape of the face member 14, the steel work 18 on which the first to third convex portions 16a to 16c are formed is pressed. Or perform stamping forging. This press or stamping forging may be hot or cold. In the case of hot work, the steel work 18 may be heated to about 800 to 1250 ° C. in advance.

By performing the pressing or stamping and forging step S2, as shown in FIG. 5, the first to third portions having the largest thickness at the central portion and decreasing the thickness toward the peripheral portion are obtained.
The face member 14 having the convex portions 16a to 16c is obtained.

First to third convex portions 16a to 16c, bottom portion 2
8 has a thickness of, for example, about 2.3 mm (the third convex part 16c), about 2.0 mm (the second convex part 16b), and about 1.
8 mm (first convex part 16a), about 1.6 mm (bottom part 2)
8), but is not particularly limited thereto, and the thickness of the bottom surface portion 28 (peripheral portion) is set to be 0.1 mm as compared with the third convex portion 16c (the central portion of the ball hitting region). 5-1.5
It can be set as small as about mm. The above dimensions are wall thicknesses at locations where score line grooves (not shown) are not provided, and the same applies to the following.

The face member 1 manufactured as described above
No. 4 exhibits high strength as compared with a face member manufactured by a precision casting method, and therefore is not easily deformed when hitting a golf ball. This is because the internal pores of the steel work 18 are crushed by rolling or roll forging as described above. Therefore, even if the wall thickness is smaller than that of the face member manufactured by the precision casting method, the strength that can withstand the load applied at the time of hitting the ball is ensured.

Further, since the first to third projections 16a to 16c are provided by rolling or roll forging, and then the face member 14 is formed by pressing or stamping forging using a mold. The projection of the burr is extremely small. For this reason, the dies can be brought close to each other to a predetermined interval, so that the minimum thickness portion, that is, the peripheral portion of the face member 14 in FIG. As described above, according to this manufacturing method, it is possible to obtain the face member 14 having a portion with a small thickness with excellent dimensional accuracy.

Next, after removing the burrs of the face member 14 as necessary, in a joining step S3, the face member 14 and the head main body 12 are joined to each other by welding, for example, so that a wood type golf club head is formed. 10 is obtained. At this time, the first to third convex portions 16 a to 16 c of the face member 14 are arranged so as to face the inside of the head main body 12.

In the wood-type golf club head 10, the portion where the third convex portion 16c is provided on the face member 14, that is, the maximum thickness portion is used as the center of the hitting area.

Here, the head body 12 is formed by casting, forging or press-forming a work made of, for example, the same steel as the face member 14, copper, copper alloy, titanium, titanium alloy, aluminum alloy or magnesium alloy. It can be produced by applying. Further, the head body 12 may be manufactured by joining a plurality of individually manufactured members.

After the joining step S3, if necessary, the wood type golf club head 10 is subjected to a solution treatment step S3.
4. Each heat treatment of the deep cooling treatment step S5 and the aging heat treatment step S6 may be performed (see FIG. 2). For example, in the solution treatment step S4, the entire wood-type golf club head 10 is heated to 800 to 1200 ° C. and the
What is necessary is just to hold for 3 hours. Further, in the deep cooling process step S5, the entire wood type golf club head 10 is set to −100.
What is necessary is just to cool to -10 degreeC and hold for 0.1 to 24 hours. In the aging heat treatment step S6, the entire wood-type golf club head 10 may be heated to 400 to 600 ° C. and held for 0.1 to 24 hours.

Further, the wood type golf club head 10
May be subjected to cutting or polishing.

As described above, the wood type golf club head 10 including the face member 14 having a portion having a small thickness but hardly causing permanent deformation or damage when the golf ball is hit is completed.

In the first embodiment, the face member 14 is provided with a thickness difference by forming the first to third elliptical projections 16a to 16c, as shown in FIG. In addition, a first protrusion 30a and a second protrusion 30b having an arc shape may be provided. In this case, the bottom portion 28 (peripheral portion), the first protrusion 30a, and the second protrusion 30b have a thickness of, for example, 1.8 mm, 2.0 mm,
It can be 2.3 mm.

As shown in FIG. 7 or FIG.
One end of each of the third to third projections 32a to 32c may be connected to each other. Bottom part 28, first to third convex parts 32a
The thickness of ~ 32c is, for example, 1.6 mm, 1.8 mm,
It can be 2.0 mm and 2.3 mm. Of course, in any case, the number of protrusions may be further increased. Face member 1 having a substantially constant thickness on the sole side
When hitting a golf ball using a golf club provided with a wood type golf club head to which the golf club head 4 (see FIG. 7) is joined, there is an advantage that a particularly soft hit feeling can be obtained.

If it is difficult to push the steel work 18 into the recess 22 in the rolling or roll forging step S1, FIG.
As shown in FIG. 5, the extrusion protrusion 3 is formed as a roll 20b, which assists in pushing one end surface of the steel work 18 into the recess 22 and protrudes to the extent that the other end surface can be kept substantially flat.
6 may be used.

Further, in the pressing or stamping and forging step S2, a face member having a curved surface may be formed by bending the steel work 18.

Further, the wood type golf club head according to the first embodiment is not limited to the wood type golf club head 10 shown in FIG. 1, but has an opening behind the striking face as shown in FIG. The wood-type golf club head 46 may be a head body 40 in which the head body 40 described above and the face member 44 having the extending portion 42 that extends integrally and extends backward from the bottom portion 28 are joined to each other. Alternatively, as shown in FIG. 11, a wood-type golf in which a head body 52 having a step portion 50 on the hitting surface side and a face member 54 having a smaller bottom surface portion 28 than the face member 14 is joined to each other. The club head 56 may be used.

Next, a wood type golf club head according to a second embodiment of the present invention will be described with reference to FIG. This wood type golf club head 60 also has a head body 62 and a face member 64 joined to each other by welding or the like.

In this case, the face member 64 is provided with a convex portion 66 having a smoothly inclined curved surface 65, so that a difference in wall thickness is provided. That is, the convex portion 66 of the face member 64 is not a step-like one in which the wall thickness decreases stepwise, but has a slope that is curved as the wall thickness gradually increases toward the sole side. .

Here, the face member 64 is shown in FIGS. Note that reference numerals Y1 to Y4 in FIG. 13 and FIG. 14 represent portions of the convex portions 66 having the same thickness as contour lines for convenience. Contour lines Y1
Y4 has a thickness of 1.6 mm in the face member 64,
It is drawn at 1.8 mm, 2.0 mm, and 2.2 mm, and the thickness at the top of the projection 66 is set to 2.3 mm.

The shortest distance M2 from the total weight, moment of inertia, and center of gravity G2 of the wood type golf club head 60 to the striking surface of the face member 64 (see FIG. 12).
Is 250 g or less, 2700 g like the wood type golf club heads 10, 46, 56 according to the first embodiment.
・ Set to cm ² or more and 25 mm or more, respectively. When a driver is constructed from the wood type golf club head 60, the total weight is preferably 195 g or less. Further, the shortest distance M2 from the moment of inertia and the center of gravity G2 to the striking surface of the face member 64.
Can be set to, for example, 2780 g · cm ² and 25.5 mm, respectively.

As described above, in the face member 64 whose thickness gradually changes, it is possible to prevent stress concentration from occurring on the face member 64 when the golf ball is hit. That is, the wood type golf club head 60
The face member 64 not only has a large sweet area but also is not easily damaged by repeated hitting of a golf ball.
Is provided.

Further, in this case, since the thickness of the face member 64 on the sole side is substantially constant, when the golf ball is hit with a golf club having the wood type golf club head 60, a particularly soft hit feeling is obtained. Can be obtained.

Here, the face member 64 can be manufactured by rolling or roll forging in the same manner as the face member 14. In this case, a concave portion having a shape corresponding to the convex portion 66 may be provided on the outer peripheral wall of the roll 20a (see FIG. 3).

The wood-type golf club head according to the second embodiment is not limited to the wood-type golf club head 60 described above, and as shown in FIGS. A wood-type golf club head having a face member 72 provided with a convex portion 70 having the largest thickness and decreasing in thickness at the same rate toward the peripheral portion, and the face member 72 is joined to a head body 73. 74. In the face member 72, the contour lines Z1 to Z4 have a thickness of 1.6 mm,
The positions of 1.8 mm, 2.0 mm, and 2.2 mm are shown, respectively. In addition, the thickness of the top of the convex portion 70 is 2.
It can be set to 3 mm.

Of course, the total weight of the wood-type golf club head 74 is set to 250 g or less, and preferably 195 g or less when constituting a driver. Further, the moment of inertia and the shortest distance M3 from the center of gravity G3 to the striking surface of the face member 72 (see FIG. 15) are respectively:
2700 g · cm ² or more, is set to at least 25 mm, for example, 2780 g · cm ^2, can be set to 25.5 mm.

Also in the face member 72 thus configured, since the wall thickness is gradually changed, it is possible to avoid stress concentration when a golf ball is hit. Accordingly, a wood-type golf club head 74 having a face member 72 that is not only wide in the sweet area but also is not easily damaged by repeated hitting of a golf ball can be configured.

[0060]

As described above, according to the wood type golf club head of the present invention, since the face member made of steel having sufficient strength is provided, the weight can be reduced by providing a difference in wall thickness. The effect that the sweet area can be enlarged while trying is achieved.

In addition, in this case, since the total weight, the moment of inertia, and the shortest distance from the center of gravity to the ball striking face of the face member are specified, the golf ball can fly the golf ball in a desired direction. It is easy to make the golf ball fly, and the flight distance of the golf ball can be secured.

It is preferable that a difference in wall thickness is provided by gradually reducing the wall thickness from the center to the peripheral edge of the face member. In this case, the occurrence of stress concentration can be avoided, and in the end, a face member that is not easily damaged can be formed.

It is preferable that the thickness of the portion from the center of the hitting region to the sole portion is made substantially constant. Thereby, a wood-type golf club head that can provide a soft feel when hitting a golf ball can be configured.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a wood type golf club head according to a first embodiment.

FIG. 2 is a flowchart of a method of manufacturing the wood type golf club head of FIG.

FIG. 3 is a schematic perspective explanatory view showing one set of rolls for performing rolling or roll forging on a steel workpiece.

FIG. 4 is an enlarged view of a main part of a steel work provided with a difference in wall thickness by forming first to third elliptical projections in a protruding manner.

FIG. 5 is a schematic overall perspective view of a face member provided with a difference in wall thickness by forming first to third protrusions in a protruding manner.

FIG. 6 is a schematic overall perspective view of a face member provided with a difference in wall thickness by forming first and second arc-shaped projections to protrude.

FIG. 7 is a view showing first to first end surfaces connected to each other at a lower peripheral portion;
It is a general | schematic whole perspective view of the face member in which the 3rd convex part was provided.

FIG. 8 is a diagram showing first to first end surfaces connected to each other at an upper peripheral portion;
It is a general | schematic whole perspective view of the face member in which the 3rd convex part was provided.

FIG. 9 is a schematic perspective explanatory view showing another example of a roll for rolling or roll forging a steel work.

FIG. 10 is a schematic longitudinal sectional view of a wood type golf club head according to a modification of the first embodiment.

FIG. 11 is a schematic longitudinal sectional view of a wood type golf club head according to another modification of the first embodiment.

FIG. 12 is a schematic longitudinal sectional view of a wood type golf club head according to a second embodiment.

FIG. 13 is a schematic overall perspective view of a face member constituting the wood type golf club head of FIG. 12;

FIG. 14 is a plan view of FIG.

FIG. 15 is a schematic longitudinal sectional view of a wood type golf club head according to a modification of the second embodiment.

16 is a schematic overall perspective view of a face member constituting the wood type golf club head of FIG. 15;

FIG. 17 is a plan view of FIG. 16;

[Explanation of symbols]

10, 46, 56, 60, 74: Wood-type golf club head 12, 40, 52, 62, 73: Head body 14, 44, 54, 64, 72: Face members 16a to 16c, 30a, 30b, 32a to 32c , 6
6, 70: convex portion 18: steel work 20a, 20b: roll 22: concave portion 24a to 24c: step portion 28: bottom portion 36: convex portion for extrusion 65: curved surface

 ──────────────────────────────────────────────────の Continuing on the front page (72) Katsumi Yamano, In-house, 5412, Shido, Shido-cho, Okawa-gun, Kagawa Prefecture (72) Inventor Junko Imade 5412, Shioji, Shido-cho, Okawa-gun, Kagawa, Japan In-house F term (reference) 2C002 AA02 CH01 CH06 MM04 PP02

Claims (6)

[Claims] 1. A face member provided with a convex portion having a portion having a maximum thickness at a central portion of a hitting region and a thickness decreasing from a central portion of the hitting region toward a peripheral portion of a head body. A wood type golf club head, wherein the face member is made of steel, and the total weight of the wood type golf club head is 250
g or less, the moment of inertia about a vertical axis passing through the center of gravity of the wood type golf club head as a rotation axis is 2700 g · c.
m ² or more, wood type golf club head the shortest distance between the centroid and the striking face of the face member is characterized in that at 25mm or more. 2. The wood-type golf club head according to claim 1, wherein the face member has a first roll having a concave portion on the outer peripheral wall portion where a depth of a central portion of the hitting region is formed, and a second roll. A steel work is interposed between the roll and the steel roll, and the steel work is pressed by the second roll to provide a thickness difference of a shape corresponding to the shape of the concave portion to the steel work. A wood type golf club head, wherein the provided steel work is formed into a face member by a mold. 3. The wood-type golf club head according to claim 1, wherein said steel contains 10 to 25% by weight of C.
r, 10-20% by weight of Co, 3-8% by weight of Ni
Alloy steel containing 3-8% by weight of Mo, 18Ni
A wood-type golf club head, which is either a maraging steel or a precipitation hardening stainless steel. 4. The wood type golf club head according to claim 3, wherein said precipitation hardening type stainless steel is SUS6.
A wood type golf club head made of 30 stainless steel. 5. The golf club head according to claim 1, wherein the thickness of the face member is continuously reduced from a central portion of the hitting region toward a peripheral portion of the head body. A wood-type golf club head, comprising: 6. The golf club head according to claim 1, wherein the face member has a substantially constant thickness at a portion extending from a central portion of the hitting region to a sole portion. A wood-type golf club head that is characterized.