JP2012120676A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club head, capable of making a face member light in weight while maintaining strength of the face member, and capable of suppressing dispersion of CT (Contact Time) values of the face member at respective hitting points to make equal the CT values at hitting points other than a sweet spot.SOLUTION: A face part 10 includes a central thick part 16 and an outer peripheral part 11 positioned on the outer periphery. The thick part 16 has a planar shape in which a roughly elliptical shape is hollowed in a roughly circular arc shape toward the center direction of the face part, and includes: a center part 17 which has a thickness that is thickest; a first ridge 18 which surrounds the center part 17 and is smaller in thickness than the center part 17; and a first valley 19 which is positioned between the center part 17 and the first ridge 18 and is smaller in thickness than the first ridge 18. The outer peripheral part 11 includes: a thin area 14 adjacent to the hollow 13 of the thick part and having a thin thickness; and a thick area 12 extending from the thick part to a heel side crown direction and a toe side sole direction and having a large thickness.

Description

  The present invention relates to a golf club head, and more particularly, to a golf club head in which a thick portion having a different thickness depending on a position is provided on the back surface of a face member.

Most of the heads of recent wood clubs occupy at least a face portion made of a metal material. The thickness of the face portion needs to be increased in order to maintain the strength that can withstand the impact with the ball. While progressing head size of, since that shall be smaller than the volume of the rules on 460 cm 3 ⁺ tolerance 10 cm ^3, the driver of the head occupies the large head most of 460 cm ³ very close to the upper limit Has reached. When the head size is increased, the sweet area is enlarged, the peripheral weight distribution is emphasized, and the moments of inertia in the left and right and up and down are increased, so that mistakes at the time of off-center hit can be reduced. However, if the head size is increased and the head weight is increased, the swing balance increases, the head speed decreases, and the flight distance may be reduced. Therefore, means such as forming the entire head with titanium or its alloy having a low specific gravity and high strength (hereinafter referred to as “titanium” unless otherwise specified) or a composite head of carbon and titanium are adopted. Yes.

  In addition to increasing the head size, many high-rebound heads with improved head rebound performance have been developed. High-rebound heads with a coefficient of restitution of 0.830 or higher since 2008 can no longer be used in competitions. Until now, many thick face materials that increase the coefficient of restitution in parallel with the increase in size of the head have been actively used. However, even with a high rebound head, a hit at a face portion other than the sweet area, that is, an off-center hit cannot be expected to have a spring effect, and there is a problem that the flight distance is extremely reduced.

  In order to solve such a problem, even when a ball is hit with a sweet spot removed by providing a thick part so as to surround the center of the back surface of the face member and reducing the thickness of the center of the face. A golf club head capable of giving a high initial speed to a ball has been developed (see Patent Document 1).

  In addition, a golf club head has been developed that increases the strength of the golf club head and enables stable hitting by providing a projection block in the center of the back of the face and two annular ribs surrounding the projection block. (See Patent Document 2).

US Pat. No. 6,824,475 (FIG. 5A) US Pat. No. 7,448,961 (FIG. 1)

  However, in the golf club heads described in Patent Documents 1 and 2, there is a problem that the weight of the entire head increases as compared with a case where the thickness of the back surface of the face is not increased. is there. Further, there is a problem that the value representing the rebound performance of a ball called CT value (Contact Time Value) varies greatly depending on the hit point of the ball.

  Therefore, in view of the above problems, the present invention can reduce the weight of the face member while maintaining the strength of the face member, and suppress variation in the CT value of the face member at each hitting point. An object of the present invention is to provide a golf club head in which the CT value at the hit point is substantially equal to the CT value at the sweet spot.

  In order to achieve the above object, a golf club head according to the present invention includes a face portion formed of a metal material. The face portion includes a thick portion located at the center of the face portion, and the thick portion. The thick wall portion has a substantially elliptical shape or a substantially circular shape that is recessed in a substantially arc shape toward the center of the face portion on two sides facing each other. The thick portion has a center portion of the face portion having the largest thickness, and surrounds the center portion, and has a thickness smaller than the center portion. Ridge, and a first valley between the central portion and the first ridge, the first valley having a wall thickness smaller than that of the first ridge, and the outer peripheral portion. Are adjacent to the two substantially arc-shaped depressions of the thick part. Two thin regions having a thin thickness, and two thick regions having a thick thickness extending from the substantially oval or substantially circular portion of the thick portion in the heel side crown direction and the toe side sole direction, respectively. And an area.

  The two thin regions of the outer peripheral portion may extend from two substantially arc-shaped depressions of the thick portion to the end of the face portion. The two thick regions of the outer peripheral portion may extend from a substantially elliptical or substantially circular portion of the thick portion to the end of the face portion. One of the thin regions of the outer peripheral portion may be adjacent to one of the thick regions of the outer peripheral portion.

  The thickness of the thin region is preferably 1.8 to 2.2 mm, and the thickness of the thick region is preferably 2.5 to 3.0 mm. The outer peripheral portion may further include a middle thickness region having a thickness between the thin thickness region and the thick thickness region.

  Of the two substantially arc-shaped depressions of the thick part, the depression on the toe side faces obliquely in the sole direction, and the depression on the heel side preferably faces obliquely in the crown direction. The length from the upper side to the lower side of the first valley is preferably 30 to 50% of the height of the face portion passing through the center of the face portion. The length from the upper side to the lower side of the first ridge is preferably 40 to 60% of the height of the face part passing through the center of the face part.

  The difference between the thickness of the central portion and the thickness of the first ridge is preferably 0.05 to 0.5 mm, and the thickness of the first ridge and the thickness of the first valley The difference is preferably 0.05 to 0.3 mm. The thick portion surrounds the first ridge, and has a second ridge having a smaller thickness than the first ridge, and a first ridge between the first ridge and the second ridge. And a second valley having a wall thickness smaller than that of the second ridge.

  As described above, in the golf club head according to the present invention, the thick portion at the center of the face portion has a substantially elliptical shape or a substantially circular shape, and has a substantially arc shape toward the center direction of the face portion on two sides facing each other. A central portion of the face portion having the largest thickness, a first ridge surrounding the central portion and having a smaller thickness than the central portion, and a central portion. A first valley between the first ridge and the first valley having a thickness smaller than that of the first ridge, and the outer peripheral portion located on the outer periphery of the thick portion is the above-mentioned Two thin-walled regions each having a small thickness adjacent to two substantially arc-shaped depressions in the thick-walled portion, and the heel-side crown direction and toe-side from the substantially elliptical or substantially circular-shaped portion of the thick-walled portion Each extends in the direction of the sole and has a thick wall thickness Since the two thick regions are provided, this makes it possible to reduce the weight of the face member while maintaining the strength of the face member, and to suppress variations in CT values at each hitting point. The CT value at the hit point is substantially equal to the CT value at the sweet spot. Therefore, even when the sweet spot is removed and the ball is hit, the flight distance of the ball can be increased.

1 is a front view showing an embodiment of a golf club head according to the present invention. It is typical sectional drawing of the golf club head in the II-II line | wire of FIG. FIG. 2 is a back view showing a face portion constituting the golf club head shown in FIG. 1. FIG. 4 is a schematic cross-sectional view of a face portion taken along line III-III in FIG. 3. FIG. 4 is a back view showing the relationship between the height of the face portion, the height of the center portion, the first valley, and the first ridge with respect to the face portion of FIG. 3. FIG. 4 is a back view showing an ellipse angle in the face portion of FIG. 3. It is a back view of the face part in 2nd Embodiment. It is typical sectional drawing of the face part in 3rd Embodiment. It is typical sectional drawing of the face part in 4th Embodiment. It is a back view which shows the face part in 5th Embodiment. It is a back view which shows the position of the hit point in the simulation of an Example. It is typical sectional drawing of the face member of a comparative example.

  Embodiments of a golf club head according to the present invention will be described below with reference to the accompanying drawings. The drawings are intended to facilitate understanding of the configuration of the present invention, and are not drawn to scale.

  As shown in FIGS. 1 and 2, the golf club head 1 includes a face member 10 having a face portion and a main body member 30. The main body member 30 includes a crown portion 4, a sole portion 5, a hosel portion 6, and a side portion 7, which are integrally formed. The face member 10 and the main body portion 30 are joined by welding, whereby the golf club head 1 having a hollow structure is formed. In FIG. 1, the configuration appearing on the front surface, that is, the back surface of the face member 10 on the hollow structure side is indicated by a broken line. Irregularities for changing the thickness of the face member 10 are formed on the back surface of the face member 10. The back surface of the face member 10 will be described.

  As shown in FIG. 3, on the back surface of the face member 10, a thick portion 16 is formed in an ellipse indicated by a line 13 on the outer peripheral portion 11 having a flat surface. However, indentations 15a and 15b are formed at both ends of the long axis of the ellipse, respectively, in which the thick portion 16 is recessed in an arc shape toward the center. That is, the thick portion 16 is surrounded by the recess 15 and the elliptical lines 13 on both sides of the elliptical short axis.

As shown in FIGS. 3 and 4, a center portion 17 having the largest thickness T ₁ in the face member 10, a flat surface, and a substantially trapezoidal shape is formed at the center of the thick portion 16. As it goes radially from the central portion 17 to the elliptical line 13, first, the wall thickness gradually decreases and then gradually increases. That is, the first valley 19 is formed so as to surround the center portion 17.

  Next, the thickness gradually increases from the first valley 19 toward the elliptical line 13 and then gradually decreases again. That is, the first ridge 18 is formed so as to surround the first valley 19.

  The wall thickness gradually decreases from the first ridge 18 toward the elliptical line 13 or the depression 15 in a radial direction. The outer edge of the thick portion 16, that is, the thickness at the positions of the elliptical line 13 and the recess 15 is basically the same except for the portions described below.

  In the range from the elliptical line 13 or the recess 15 to the outer edge of the face member 10, that is, the outer peripheral portion 11, the thickness as described above does not gradually change radially, and the thickness is basically constant. Three regions of different wall thickness are formed. The first region is a thin region 12 which is surrounded by the thick-walled depression 15 and the elliptical line 13 and has a thin thickness. The second region is a thick region 14 that extends from the elliptical line 13 of the thick portion to the end of the face portion in the heel side crown direction or the toe side sole direction, and has a large thickness. The third region is a region other than these, and is a middle region 11 a having a thickness between the thin region 12 and the thick region 14. Each structure of a thick part and an outer peripheral part is demonstrated in detail.

  The central portion 17 of the thick portion 16 includes a sweet spot of the golf club head 1. The center portion 17 also includes the intersection of the major axis and the minor axis of the ellipse indicated by the line 13, that is, the center of the ellipse. This intersection and the sweet spot may be the same or different.

Thickness _{T 1} of the central portion 17 in the range of 2.0~3.8mm is preferred. Thickness _{T 2} of the first ridge 18 is smaller than the thickness _{T 1} of the central portion 17, the range of 2.0~3.6mm is preferred. The difference between T ₁ and _{T 2} are preferably not less than 0.05 mm, more preferably at least 0.1 mm. Moreover, this difference is preferably 0.5 mm or less, and more preferably 0.4 mm or less.

The wall thickness T ₃ of the first valley 19 is smaller than the wall thickness T ₂ of the first ridge 18 and is preferably in the range of 2.0 to 3.5 mm. The difference between T ₂ and _{T 3} is preferably at least 0.05 mm, more preferably not less than 0.2 mm. Further, this difference is preferably 0.3 mm or less, and more preferably 0.2 mm or less.

Thickness _{T 5} of the outer peripheral portion of the medium thickness region 11a is smaller than the thickness _{T 3} of the first trough 19, the range of 2.2~2.5mm is preferred. The difference between T ₃ and T ₅ is preferably 0.1 mm or more, and more preferably 0.3 mm or more. Further, this difference is preferably 1.5 mm or less, and more preferably 1.0 mm or less.

Thickness _{T 4} of the thin regions 14 of the outer peripheral portion is in the range of 1.8~2.2mm is preferred. The difference between T ₄ and T ₅ is preferably 0.1 mm or more, and more preferably 0.2 mm or more. The thickness of the thick region 12 at the outer peripheral portion is smaller than the thickness T ₂ of the first ridge 18 and is preferably in the range of 2.5 to 3.0 mm. The difference in thickness between the thick region 12 and the middle region 11a is preferably 0.5 mm or more, and more preferably 0.7 mm or more. Note that the first ridge 18 of the thick portion is formed so as to gradually decrease in thickness from the thick region 12 of the outer peripheral portion. That is, the thickness at the position of the elliptical line 13 in the thick part is formed to be different between the part where the thick part 12 of the outer peripheral part is adjacent and the part of the other elliptical line 13.

  Further, as shown in FIG. 3, the thick region 12 in the outer peripheral portion is formed so that the width gradually decreases from a position adjacent to the thick portion to the end of the face member. The minimum width of the thick region 12 is preferably 2 mm or more, and more preferably 3 mm or more. The maximum width of the thick region 12 is preferably 15 mm or less, and more preferably 12 mm or less.

As shown in FIG. 5, when the height H ₁ of the face member 10 passing through the center of the face member 10 is 100%, from the upper side of the thick ridge first ridge 18 in the height direction of the face member 10. length _{H 2} of between lower, preferably 40 to 60%. Similarly, the length H ₃ between the upper side and the lower side of the first valley 19 is preferably 30 to 50%. Similarly, the length H ₄ between the upper side and the lower side of the edge of the center portion 17 is preferably 10 to 40%.

  As shown in FIG. 6, the major axis of the ellipse indicated by the ellipse line 13 is inclined in the crown direction on the toe 3 side and in the sole direction on the heel 2 side. In general, the golfer's hitting points are inclined in this manner because the hitting points of the golfer are shifted to the crown side on the toe 3 side and to the sole side on the heel 2 side. Specifically, it is preferable that the inclination θ of the major axis 42 of the ellipse is about 5 ° or more with respect to the horizontal line 40 when the golf club head is placed at a normal address position. More preferably, it is arranged so as to be at least °. Further, the inclination θ of the major axis 42 of the ellipse is preferably about 40 ° or less, and more preferably about 30 ° or less.

  The ratio of the length of the major axis and the minor axis of the ellipse indicated by the ellipse line 13 is preferably in the range of 100: 50 to 50:50, more preferably in the range of 95:50 to 70:50 (the major axis and Needless to say, if the minor axis has the same ratio, it is not an ellipse but a circle). The ratio of the length of the thick part 16 on the major axis of the ellipse (that is, the length between the recesses 15a and 15b) to the length of the minor axis of the ellipse is preferably in the range of 5: 4 to 5: 6. The curvature radius of the depression 15a on the sole side is preferably about 12 mm or more, and more preferably about 13 mm or more. The curvature radius of the depression 15a on the sole side is preferably about 25 mm or less, and more preferably about 20 mm or less.

  The face member 10 can be formed by either forging or casting. Further, as the material of the face member 10, titanium, a titanium alloy, stainless steel, or the like can be used. The volume of the golf club head 1 is preferably about 160 cc or more, more preferably about 350 cc or more. On the other hand, the volume of the golf club head 1 is preferably about 500 cc or less, and more preferably about 480 cc or less. Further, the weight of the golf club head 1 is preferably about 150 g or more, and more preferably about 160 g or more. On the other hand, the weight of the golf club head 1 is preferably about 250 g or less, more preferably about 200 g or less.

  In FIG. 4, the surface of the face member 10 on the hitting side is shown flat so that the configuration of the present invention can be easily understood. However, a bulge with a curvature radius of 250 mm to 800 mm is provided on the hitting surface of the face member 10. Can be formed. Similarly, a roll having a curvature radius of 250 mm to 800 mm can be formed on the ball striking surface of the face member.

  Although one embodiment of the present invention has been described with reference to FIGS. 1 to 6, the present invention is not limited to this embodiment. For example, in FIG. 3, the thin regions 14 a and 14 b on the outer peripheral portion were formed between the hollow portions 15 a and 15 b of the thick portion and the elliptical line 13, respectively, but as shown in FIG. The thin regions 14c and 14d can also extend from the depressions 15a and 15b to the toe side and heel side ends of the face member 10, respectively.

  In FIG. 3, the thick regions 12a and 12b in the outer peripheral portion are formed so that the width decreases from the thick portion toward the outer peripheral direction. However, as shown in FIG. The regions 12c and 12d can also be formed so that the width increases from the thick portion toward the outer periphery. Furthermore, as shown in FIG. 7, the thick areas 12c and 12d and the thin areas 14c and 14d on the outer periphery can be adjacent to each other. As a result, the middle thickness region 11b of the outer peripheral portion is only between the upper end of the thick portion and the end on the crown side of the face member, and only between the lower end of the thick portion and the end on the sole side of the face member. However, it is possible to further reduce the weight of the face portion by greatly increasing the area of the thin region 14 at the outer peripheral portion.

In FIG. 4, the thick portion is formed so that the thickness gradually changes. However, the present invention is not limited to this, and as shown in FIG. 8, the thick portion has a thickness T ₃ . the bottom of the first valley 19 may be formed so as to have a certain area with, the top of the first ridge 18 having a thickness T ₂ is formed to have a certain area in Also good. Thus, even if the thickness of the thick portion changes stepwise, the same effect can be obtained.

  As another embodiment, as shown in FIG. 9, the wall thickness does not gradually decrease from the edge of the central portion 17 to the first valley 19, that is, the first valley 19 is directly below the edge of the central portion 17. It may be located. Similarly, the wall thickness may not be gradually reduced from the first ridge 18 to the recess 15, and the first ridge 18 may be positioned directly above the recess 15. Thus, even if the thickness of the thick portion is changed, the same effect can be obtained.

  Furthermore, in FIG. 3, although one set of valleys and ridges were formed in the thick portion, the present invention is not limited to this, and a plurality of sets of valleys and ridges can also be formed. For example, as shown in FIG. 10, a second valley 22 and a second ridge 21 are formed in order so as to surround the first ridge 18.

The wall thickness of the second valley 22 is smaller than the wall thickness T ₃ of the first valley 19 and larger than or equal to the wall thickness T ₅ of the inner wall region 11a of the outer peripheral portion. The difference between the thickness _{T 3} of the wall thickness of the first valley 19 of the second valley 22 is preferably at least 0.1 mm, more preferably not less than 0.3 mm. Further, this difference is preferably 1.0 mm or less, and more preferably 0.8 mm or less.

The wall thickness of the second ridge 21 is smaller than the wall thickness T ₂ of the first ridge 18 and larger than the wall thickness of the second valley 22. The thickness of the second ridge 21 and the difference between the thickness _{T 2} of the first ridge 18 is preferably at least 0.1 mm, more preferably not less than 0.3 mm. Further, this difference is preferably 1.5 mm or less, and more preferably 1.0 mm or less.

  As shown in FIG. 1, the embodiment in which the entire face portion of the golf club head 1 is the face member 10 has been described, but the present invention is not limited to this. For example, the central portion of the face portion May be formed as a face member, and the remaining portions at both ends of the face portion may be formed integrally with the head body.

The CT value (Contact Time Value) for the face member of the present invention was calculated by simulation using a computer (Example 1). The configuration shown in FIGS. 3 and 4 was adopted as the configuration of the face member. As the design conditions of the face member, the thickness T ₁ of the central portion of the thick portion is 3.7 mm, the thickness T ₂ of the first ridge is 3.5 mm, and the thickness T ₃ of the first valley is 3. 0 mm, the thickness of the thick area on the outer peripheral portion is 2.7 mm, the thickness of the thin area on the toe side is 2.2 mm, the thickness of the thin area on the heel side is 1.9 mm, and the thickness T of the medium thickness area ₅ was 2.4 mm. The height H ₁ of the face member is 50 mm, the length H ₂ from the upper side to the lower side of the first ridge is 30 mm, the length H ₃ from the upper side to the lower side of the first valley is 20 mm, It was 14mm length _{H 4} the lower from the upper edge.

  The major axis of the ellipse was 64 mm, the minor axis was 40 mm, and the ellipse angle θ was 15 °. The curvature radius of the toe-side depression 15b was 32 mm, and the curvature radius of the heel-side depression was 12 mm. The ratio of the area of the outer peripheral portion and the thick portion in the entire face portion was 7: 5. Although the calculation was made with the central part included in the thick part, the area of the central part was about 3% of the area of the entire face part. The width of the thick region at the outer periphery was 4 to 10 mm. The material of the face member is assumed to be a titanium alloy, the Young's modulus is 108 GPa, and the Poisson's ratio is 0.30.

  As shown in FIG. 11, the hitting points of the ball were examined for 15 different hitting points in the vertical direction and the horizontal direction. The center hit point 50c is assumed to be a hit ball at a sweet spot, and is set in the center of the face member. The other 14 hitting points were assumed to be hitting balls without the sweet spot. The positions 10 mm away from the center hitting point 50 c on the toe side and heel side were the hitting points 50 b and 50 d, and the positions 10 mm away on the toe side and heel side were the hitting points 50 a and 50 e, respectively. Further, the positions 10 mm away from the five striking points 50a to 50e on the crown side and the sole side were 50aH to 50eH and 50aL to 50eL, respectively.

  The hitting points 50a, 50aH, 50aL, 50e, and 50eH were located approximately between the first ridge of the thick wall portion and the depression or elliptical line. The hit point 50eL was located in the thin area of the outer peripheral portion. Further, the hit points 50b, 50bH, 50cH, 50cL, 50d, and 50dL were located approximately between the edge of the central portion and the first valley. The hit points 50bL and 50dH were located approximately between the first valley and the first ridge.

  For comparison, a simulation similar to the above was performed on the face member including the thick portion and the rib shown in FIG. 12 (Comparative Example 1). The thickness of the central portion 67 is a maximum of 3.7 mm as in the first embodiment, but is configured such that the thickness gradually decreases radially from the central portion toward the outer edge of the thick portion 66. The outer edge of the thick part 66, that is, the thickness of the outer peripheral part 11 was 2.4 mm as in the first embodiment. The thickness of the thin region 64 at the outer peripheral portion was 2.1 mm on both the toe side and the heel side. In Comparative Example 1, two ribs 62 extending from the central portion 67 to the outer edge of the face member are provided. The thickness of the rib 62 was 3.3 mm.

  The simulation results of Example 1 and Comparative Example 1 as described above are shown in Tables 1 and 2. In the table, the position of the center hit point 50c is 0 mm, the distance toward the crown side or the heel side is plus, and the distance toward the sole side or the toe side is minus. Moreover, the result of the table | surface was shown by the ratio when the CT value of the center dot 50c is set to 100.

  As shown in Table 1 and Table 2, the thickness of the thick portion gradually decreases from the central portion toward the outside, and is thicker than Comparative Example 1 in which ribs are provided from the central portion to the outer edge of the member. In Example 1, in which the wall thickness is changed so that valleys and ridges are formed in the part and the thick region is provided in the outer peripheral part, it is possible to obtain an even CT value particularly at the hitting points of 0 mm and 10 mm in the height direction. did it. Therefore, it can be seen that even when the ball is hit with the sweet spot removed, resilience similar to that when the ball is hit with the sweet spot can be exhibited.

  Further, the weight of the face member of Comparative Example 1 was 31.99 g, whereas the weight of the face member of Example 1 was 31.37 g. That is, a weight reduction of 0.62 g could be achieved.

DESCRIPTION OF SYMBOLS 1 Golf club head 2 Heel 3 Toe 4 Crown part 5 Sole part 6 Hosel part 7 Side part 10 Face member 11 Outer peripheral part 12 Thick area 13 Ellipse line 14 Thin area 15 Depression 16 Thick part 17 Center part 18 1st ridge 19 First valley 21 Second ridge 22 Second valley 30 Head body 40 Horizontal line 42 Ellipse major axis 50

Claims (11)

A golf club head including a face portion formed of a metal material, wherein the face portion includes a thick portion located at the center of the face portion and an outer peripheral portion located at the outer periphery of the thick portion. And
The thick portion has a substantially elliptical shape or a substantially circular shape, and has a planar shape that is recessed in a substantially arc shape toward the center direction of the face portion on two sides facing each other.
The thick wall portion has a center portion of the face portion having the largest wall thickness, a first ridge surrounding the center portion and having a wall thickness smaller than the center portion, the center portion and the first portion. A first valley between the first ridge and having a wall thickness smaller than that of the first ridge,
The outer peripheral part is adjacent to the two substantially arc-shaped depressions of the thick part, and has two thin regions having a thin thickness, and a heel from the substantially elliptical or substantially circular part of the thick part. A golf club head comprising two thick regions extending in a side crown direction and a toe side sole direction and having a thick thickness.   2. The golf club head according to claim 1, wherein the two thin regions of the outer peripheral portion respectively extend from two substantially arc-shaped depressions of the thick portion to the end of the face portion.   3. The golf club head according to claim 1, wherein two thick regions of the outer peripheral portion respectively extend from a substantially elliptical or substantially circular portion of the thick portion to an end of the face portion.   The golf club head according to claim 1, wherein one of the thin regions of the outer peripheral portion is adjacent to one of the thick regions of the outer peripheral portion.   The golf club head according to any one of claims 1 to 4, wherein a thickness of the thin region is 1.8 to 2.2 mm, and a thickness of the thick region is 2.5 to 3.0 mm.   The golf club head according to any one of claims 1 to 5, wherein the outer peripheral portion further includes a middle thickness region having a thickness between the thin thickness region and the thick thickness region.   7. The depression on the toe side faces diagonally in the sole direction, and the depression on the heel side faces diagonally in the crown direction, out of the two substantially arc-shaped depressions of the thick part. The golf club head described in 1.   The length from the upper side to the lower side of the first valley is 30 to 50% with respect to the height of the face portion passing through the center of the face portion. Golf club head.   The length from the upper side to the lower side of the first ridge is 40 to 60% with respect to the height of the face portion passing through the center of the face portion. Golf club head.   The difference between the thickness of the central portion and the thickness of the first ridge is 0.05 to 0.5 mm, and the difference between the thickness of the first ridge and the thickness of the first valley is The golf club head according to any one of claims 1 to 9, which is 0.05 to 0.3 mm.   The thick wall portion surrounds the first ridge, and has a second ridge having a thickness smaller than the first ridge, and a first ridge between the first ridge and the second ridge. 11. The golf club head according to claim 1, further comprising a second valley that is a valley of 2 and has a wall thickness smaller than that of the second ridge.

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