Golf club head

Abstract

To provide an iron type golf club head which imparts more backspin on a ball without impairing hitting feeling.SOLUTION: An iron type golf club head 1 includes a face 2. The face 2 includes a hitting face, a back surface 22 on the opposite side of the hitting face, and a face thickness defined by them. On the back surface 22, a cavity part 30 dented toward the hitting face side is formed. In the cavity part 30, a bulging part 50 where the face thickness is partially large is formed. The bulging part 50 extends in a vertical direction of the head. The bulging part 50 includes a crown part 51 where the thickness is largest in the bulging part 50 in a face cross section which is perpendicular to the hitting face and extends in a toe-heel direction and a pair of inclined surfaces 52, 52 which extend in a manner that the face thickness decreases toward a toe side and a heel side of the cavity part 30 from the crown part 51.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an iron-type golf club head. [Background technology]

[0002] The following Patent Document 1 discloses a cavity-back iron-type golf club having a cavity formed on the back face side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2020-178933 Summary of the Invention [Problem to be solved by the invention]

[0004] Iron-type golf clubs impart backspin to a ball when it is hit. When a ball is given sufficient backspin, the ball's rolling (so-called run) after it hits the ground is suppressed. In order to suppress variation in flight distance, an iron-type golf club head capable of imparting more backspin to the ball is desired.

[0005] However, it has been found that a cavity back iron type golf club head imparts less backspin to the ball compared to a so-called muscle back iron type golf club head.

[0006] In a cavity-back iron golf club head, the face thickness of the cavity portion is relatively small, so the face bends more when hitting the ball, which tends to result in a longer contact time between the face and the ball. As a result of the inventors' experiments, it was found that the amount of backspin on the hit ball tends to decrease as the contact time between the ball and the face becomes longer. The reason for this is believed to be as follows.

[0007] FIG. 14 is a graph showing the relationship between the shearing force acting on the ball when hitting the ball with an iron-type golf club head and time. In FIG. 14, the vertical axis indicates the shearing force acting on the ball, and the horizontal axis indicates time. The ball contacts the face at time zero. Also in FIG. 14, the positive shearing force is the force in the direction of giving backspin to the ball, and the negative shearing force is the force in the direction of giving spin opposite to the backspin to the ball.

[0008] When various experiments were conducted by changing the rigidity of the face and the like, it was found that as the contact time between the ball and the face increases, the ratio of the time during which the negative shearing force acts on the ball tends to relatively increase. Also, the amount of backspin of the ball is almost determined by the difference between the impulse of the positive shearing force acting on the ball and the impulse of the negative shearing force. Therefore, it is presumed that as the contact time between the ball and the face increases, the impulse of the negative shearing force acting on the ball increases, and as a result, the amount of backspin of the ball relatively decreases.

[0009] Also, an iron-type golf club head with a cavity back is desired to further improve the hitting feeling such as the hitting feeling and the hitting sound.

[0010] The present invention has been devised in view of the above circumstances, and the main object is to provide an iron-type golf club head with a cavity back that can improve the hitting feeling and give more backspin to the hit ball.

Means for Solving the Problems

[0011] One aspect of the present invention is an iron-type golf club head including a face, the face including a striking face, a back surface opposite the striking face, and a face thickness defined therebetween, a cavity portion recessed toward the striking face side being formed in the back surface, a raised portion partially increasing the face thickness being formed in the cavity portion, the raised portion extending in the head vertical direction, the raised portion including, in a face cross section along the toe-heel direction orthogonal to the striking face, a top portion having the largest thickness at the raised portion and a pair of inclined surfaces extending from the top portion such that the face thickness decreases toward the toe side and the heel side of the cavity portion.

[0012] In another aspect of the present invention, the top portion may be located within 5 mm from the center position in the toe-heel direction of the striking face in the toe-heel direction.

[0013] In another aspect of the present invention, a frame portion surrounding the cavity portion is formed in the back surface, the frame portion including a top side frame, and the raised portion may be connected to the top side frame.

[0014] In another aspect of the present invention, a frame portion surrounding the cavity portion is formed in the back surface, the frame portion including a sole side frame, and the raised portion may be connected to the sole side frame.

[0015] In another aspect of the present invention, the face thickness at the raised portion may be 4 mm or more.

[0016] In another aspect of the present invention, the cavity portion may include a thin portion having a face thickness of 3 mm or less on the toe side and / or the heel side of the raised portion.

[0017] In another aspect of the present invention, the length of the raised portion in the head vertical direction may be 5 mm or more.

[0018] In another aspect of the present invention, the width W of the raised portion in the toe-heel direction may be 10% or more, and further 15% or more, of the face length FL which is the length of the face in the toe-heel direction.

[0019] In another aspect of the present invention, the width of the raised portion in the toe-heel direction may be constant or variable in the head up-down direction. In another aspect of the present invention, the width of the raised portion in the toe-heel direction may increase toward the sole side.

[0020] In another aspect of the present invention, the face includes a first portion made of a first material forming the striking face and a second portion made of a second material constituting the raised portion, and the second material may have a higher elastic modulus than the first material.

[0021] In another aspect of the present invention, the pair of inclined surfaces may have the face thickness decreasing continuously. Also, in another aspect of the present invention, the pair of inclined surfaces may have the face thickness decreasing stepwise.

Advantages of the Invention

[0022] By adopting the above configuration, the iron-type golf club head of the present invention can improve the hitting feeling and impart more backspin to the hit ball.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

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Figure 8

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Figure 14

Best Mode for Carrying Out the Invention

[0024] Hereinafter, some embodiments of the present invention will be described with reference to the drawings. This specification is not intended to limit the present invention in any way. Also, each embodiment can be used alone or in various combinations. Furthermore, throughout this specification, the same or common elements are denoted by the same reference numerals, and duplicate descriptions are omitted.

[0025] FIGS. 1 to 4 are, respectively, a front view, a rear view, a sectional view taken along line III-III of FIG. 1, and a perspective view of an iron-type golf club head (hereinafter sometimes simply referred to as "head") 1 of the present embodiment.

[0026] As shown in FIGS. 1 to 4, the head 1 includes, for example, a face 2, a top 3, a sole 4, a toe 5, a heel 6, and a hosel 7. The head 1 of the present embodiment is, for example, a forged iron formed of a metal material. The head 1 may be, for example, a cast iron. Further, the head 1 of the present embodiment has a one-piece structure, but may have a multi-piece structure.

[0027] The face 2 has a striking face 21 which is a face for striking a ball. A plurality of face lines 8 are formed on the striking face 21 for the purpose of increasing the friction with the ball. The face line 8 of the present embodiment is, for example, a narrow groove linearly extending in the toe-heel direction. The face line 8 is formed in the main striking region intended for the head 1. Note that it should be noted that the face line 8 is omitted in some drawings.

[0028] [Reference state] In FIGS. 1 to 4, the head 1 is in a reference state. In this specification, the "reference state" of the head 1 means a state in which the head 1 is placed on the horizontal plane HP such that the face line 8 formed on the striking face 21 is parallel to the horizontal plane HP, as conceptually shown in FIG. 5. Further, in the reference state, the central axis CL (axis of the club shaft) of the hosel 7 of the head 1 is arranged within the reference vertical plane VP. The reference vertical plane VP is a plane perpendicular to the horizontal plane HP. In the reference state, the face line 8 is parallel to both the horizontal plane HP and the reference vertical plane VP. Further, in FIG. 5, α represents the lie angle and β represents the loft angle. In this specification and the claims, unless otherwise specified, the head 1 is assumed to be in the reference state, and the configuration of each part is described.

[0029] [Directions of the head] Referring to FIG. 5, the front side of the head 1 means the side of the striking face 21. The rear side or the back side of the head 1 means the side of the back surface 22. Also, in FIG. 5, the head front-rear direction is the direction of the x-axis orthogonal to the reference vertical plane VP. Further, the toe-heel direction of the head 1 is the direction of the horizontal y-axis orthogonal to the head front-rear direction. The up-down direction of the head 1 is the direction of the z-axis orthogonal to both the x-axis and the y-axis. The "upper side" and "lower side" of the head 1 correspond to the "upper side" and "lower side" in the reference state, respectively.

[0030] [Structure of Each Part of the Head] As shown in FIG. 3, the face 2 has a striking face 21 and a back surface 22 which is the opposite face thereof. In the present embodiment, the striking face 21 is formed as a flat surface. Also, the face 2 defines a face thickness T between the striking face 21 and the back surface 22 (see FIG. 3). In this specification, the face thickness T is the distance measured in the direction orthogonal to the striking face 21 from the striking face 21 to the back surface 22. It has a solid structure in which a metal material is continuous from the striking face 21 to the back surface 22.

[0031] The top 3 extends rearward from the upper edge of the striking face 21 of the head 1 and constitutes the upper surface portion of the head 1, for example, as well represented by FIG. 3.

[0032] The sole 4 extends rearward from the lower edge of the striking face 21 of the head 1 and constitutes the lower surface portion of the head 1.

[0033] The toe 5 is the end portion farthest from the hosel 7 in the toe-heel direction of the head 1 and smoothly connects between the top 3 and the sole 4.

[0034] The heel 6 is the end portion located on the opposite side of the toe 5 in the toe-heel direction of the head 1, and the hosel 7 is connected thereto.

[0035] As shown in FIG. 1, the hosel 7 is provided with a shaft insertion hole 7a for receiving a club shaft (not shown). The central axis CL of the hosel 7 is defined by the central axis of the shaft insertion hole 7a.

[0036] As shown in FIGS. 2 and 3, on the back surface 22 of the head 1 of the present embodiment, a cavity portion 30 recessed toward the hitting face 21 side and a frame portion 40 extending along the peripheral portion of the back surface 22 so as to surround the cavity portion 30 are formed. In the cavity portion 30, the face thickness is formed relatively small. On the other hand, the frame portion 40 has a larger face thickness than the cavity portion 30. The face thickness in this cavity portion 30 can be appropriately determined, for example, in the range of 1.0 to 4.0 mm.

[0037] As shown in FIG. 2, the frame portion 40 of the present embodiment includes a top side frame 41, a sole side frame 42, a toe side frame 43, and a heel side frame 44. The top side frame 41 extends in the toe - heel direction along the top 3. The sole side frame 42 extends in the toe - heel direction along the sole 4. The toe side frame 43 and the heel side frame 44 are formed on the toe 5 and the heel 6, respectively, and connect the top side frame 41 and the sole side frame 42. Thus, the frame portion 40 of the present embodiment is formed in an annular shape so as to continuously surround the cavity portion 30. In other embodiments, the frame portion 40 may have a partially interrupted portion.

[0038] In the cavity - back head 1 as in the present embodiment, since a large amount of weight is distributed to the peripheral portion of the face 2, the moment of inertia around the head center of gravity becomes large. Therefore, even when the head 1 of the present embodiment strikes the ball at a position deviated from the sweet spot of the hitting face 21, it can suppress the undesirable rotational movement of the face 2. This helps to stabilize the directionality of the hit ball. Although not particularly limited, in order to effectively exhibit such an effect, it is desirable that the frame portion 40 has a face thickness of, for example, 5 mm or more.

[0039] [Raised portion] Figure 6 shows a partial face cross-section along line VI-VI of FIG. 2. This face cross-section is a cross-section along the toe-heel direction orthogonal to the striking face 21. As shown in FIGS. 2 and 6, a raised portion 50 with a partially increased face thickness is formed in the cavity portion 30. Further, the raised portion 50 extends in the head vertical direction through the cavity portion 30.

[0040] The raised portion 50 of the present embodiment includes a top portion 51 having the largest thickness in the raised portion 50 and a pair of inclined surfaces 52, 52. The top portion 51 is a portion that bulges rearward of the head so that the face thickness is the largest in the raised portion 50. The pair of inclined surfaces 52 extend from the top portion 51 toward the toe side and the heel side of the cavity portion 30, respectively, such that the face thickness decreases. Therefore, the face thickness at the raised portion 50 is the largest at the top portion 51 (face thickness Ta), and decreases from the top portion 51 toward the toe side and the heel side, respectively. The raised portion 50 of the present embodiment extends in the head vertical direction with a cross-sectional shape as shown in FIG. 6.

[0041] The raised portion 50 as described above provides a locally large face thickness in the cavity portion 30 and improves the bending rigidity around the axis along the toe-heel direction of the cavity portion 30. For this reason, in the head 1 of the present embodiment, large deflection of the face 2 during ball striking is suppressed, and thus the contact time between the ball and the striking face 21 is shortened. Therefore, the head 1 of the present embodiment can reduce the influence of negative shearing force on the ball during ball striking and can impart sufficient backspin to the hit ball.

[0042] In addition, the above-mentioned raised portion 50 can improve the bending rigidity of the cavity portion 30 and provide a firm hitting feeling with less vibration during ball striking. Furthermore, by providing a pair of inclined surfaces 52, the raised portion 50 causes the face thickness to change from the top 51 in the toe-heel direction. This can reduce the variation (change) in hitting feeling and hitting sound even when the hitting position varies in the toe-heel direction of the hitting face 21, and can stably provide a good hitting feeling.

[0043] As shown in FIG. 2, the length L of the raised portion 50 in the head vertical direction is not particularly limited, but for example, it is preferably 5 mm or more, more preferably 7 mm or more, and even more preferably 10 mm or more. This length L is measured as the length of the top 51 in the head vertical direction. When the length L of the raised portion 50 is specified to be 5 mm or more, the bending rigidity of the cavity portion 30 can be more reliably increased, and thus more backspin can be imparted to the ball.

[0044] As shown in FIG. 6, the raised portion 50 of the present embodiment is formed as a raised portion having a triangular cross-section. In other words, the face thickness of the pair of inclined surfaces 52 constituting the raised portion 50 continuously decreases toward the toe side and the heel side, respectively. Therefore, the raised portion 50 of the present embodiment does not have a flat portion where a constant face thickness is continuous in the toe-heel direction. In the aspect as shown in FIG. 6, the pair of inclined surfaces 52 may be linear inclined surfaces, or may be concave or convex arc-shaped inclined surfaces.

[0045] Also, as shown in FIG. 12(A), the face thickness of the pair of inclined surfaces 52 may decrease stepwise toward the toe side and the heel side. In such an aspect, the pair of inclined surfaces 52 may each partially include a flat portion where a constant face thickness is continuous in the toe-heel direction.

[0046] In the raised portion 50 of the present embodiment, the top portion 51 defines a ridge line extending vertically that is visible to the naked eye. However, the present invention is not limited to such an aspect. For example, the top portion 51 may be the tip of a portion rounded by an arc surface as shown in FIG. 12(B) so as not to define a distinct ridge line, or may be formed as a flat plane extending in the toe-heel direction with a certain thickness as shown in FIGS. 12(C) and (D).

[0047] In the toe-heel direction, the top portion 51 of the raised portion 50 is desirably located within 5 mm, more preferably within 3 mm, in the toe-heel direction from the central position FC (see FIGS. 1 and 2) in the toe-heel direction of the hitting face 21. In particular, it is desirable that all of the vertically extending top portion 51 is located within 5 mm in the toe-heel direction from the central position FC. When the top portion 51 has a width in the toe-heel direction, the position of the top portion 51 is defined as the position of its center in the toe-heel direction.

[0048] Generally, a golfer tends to attempt to hit the ball at the central position FC in the toe-heel direction of the hitting face 21. Therefore, by specifying the position of the top portion 51 within the above-described range, the above-described action of imparting sufficient backspin to the ball can be more reliably exerted. Further, at the time of hitting the ball, the action of providing a firm hitting feeling and less vibration to the golfer can be more reliably exerted.

[0049] In this specification, the central position FC in the toe-heel direction of the hitting face 21 is generally defined as the central position in the toe-heel direction between the end point 8a located on the most toe side of the face line 8 and the end point 8b located on the most heel side of the face line 8 as shown in FIG. 1. However, for the head 1 in which the face line 8 extends beyond the highest position P1 of the top 3 to the toe 5 side as shown in FIG. 7, it means the central position in the toe-heel direction between the position 8c separated 18 mm from the most toe side end of the hitting face 21 to the heel side and the end point 8b located on the most heel side of the face line 8.

[0050] As shown in FIG. 2, the raised portion 50 is preferably connected to the top side frame 41. In this case, a T-shaped reinforcing structure in which the raised portion 50 and the top side frame 41 are connected is formed on the upper side of the back surface 22 of the face 2. Such a head 1 can more effectively suppress the deflection of the face 2 when hitting the ball on the upper side of the hitting face 21, and thus can give the ball more backspin.

[0051] Also, the raised portion 50 may be connected to the sole side frame 42. In this case, an inverted T-shaped reinforcing structure in which the raised portion 50 and the sole side frame 42 are connected is formed on the lower side of the back surface 22 of the face 2. Such a head 1 can more effectively suppress the deflection of the face 2 when hitting the ball on the lower side of the hitting face 21, and thus can give the ball more backspin. In particular, since the iron-type head 1 has many opportunities to hit the ball on the sole side of the hitting face 21, in this embodiment, it is desirable in that a good hitting feeling can be stably exhibited.

[0052] As shown in FIG. 6, the maximum face thickness Ta at the raised portion 50 is, for example, 4 mm or more, preferably 4.5 mm or more, and more preferably 5 mm or more. When the thickness of the raised portion 50 is 4.0 mm or more, the bending rigidity of the cavity portion 30 can be more surely increased, and thus more backspin can be given to the ball. On the other hand, if the maximum face thickness Ta at the raised portion 50 becomes excessively large, there is a risk of a significant increase in the head weight and the weight concentrating near the head center of gravity and the moment of inertia not being able to be increased. From such a viewpoint, the maximum face thickness Ta at the raised portion 50 is, for example, 8 mm or less, preferably 7 mm or less, and more preferably 6 mm or less.

[0053] As shown in FIG. 6, the maximum face thickness Ta at the raised portion 50 in each face cross section may be constant or variable in the head vertical direction. Also, it is desirable that the maximum face thickness Ta at the raised portion 50 continuously increases toward the sole 4 side. In such a form, not only can a good hitting feeling be stably exhibited, but also more weight can be distributed to the sole side of the head 1, and thus, the head 1 can be made to have a lower center of gravity.

[0054] As shown in FIG. 6, the cavity portion 30 may include a thin portion 60 with a face thickness of 3 mm or less on the toe side and / or the heel side of the raised portion 50. By providing the thin portion 60 on the toe side and / or the heel side of the raised portion 50, the effect of distributing the weight by the cavity back to the periphery of the face can be sufficiently maintained. In the head 1 of the present embodiment, thin portions 60 with a constant thickness Tb are formed on both the toe side and the heel side of the raised portion 50. In other forms, the thin portion 60 may be formed on only one of the toe side and the heel side of the raised portion 50.

[0055] As shown in FIG. 6, the width W of the raised portion 50 in the toe-heel direction may be, for example, 10% or more, more preferably 15% or more, and even more preferably 20% or more of the face length FL which is the length of the face 2 in the toe-heel direction. In this specification, the width W of the raised portion 50 is the distance in the toe-heel direction between the toe-side end 52a and the heel-side end 52b of the pair of inclined surfaces 52. Also, in this specification, as shown in FIG. 1, the face length FL is the distance in the toe-heel direction from the most toe-side end of the head 1 to the most heel-side end point 8b of the face line 8. When the width W of the raised portion 50 is specified to be 10% or more of the face length FL, the change in the face thickness becomes gentler, and it is desirable in that the variation in the hitting feeling when the hitting points vary can be further suppressed. On the other hand, if the width W of the raised portion 50 becomes excessively large, there is a risk of a significant increase in the head weight and the weight concentrating near the head center of gravity, making it impossible to increase the moment of inertia. From such a perspective, the width W of the raised portion 50 is, for example, 55% or less, preferably 50% or less, and more preferably 45% or less of the face length FL.

[0056] As shown in FIG. 2, the width W of the raised portion 50 of the present embodiment is substantially constant in the head vertical direction. In other forms, the width W of the raised portion 50 may vary. FIG. 8 shows a form in which the width W of the raised portion 50 increases toward the sole 4 side. In the case of this embodiment, it is possible to distribute more weight on the sole side of the head 1, and thus, the head 1 can be made to have a lower center of gravity. Also, it is particularly desirable that the width W of the raised portion 50 changes continuously. Thereby, even when the hitting points of the ball vary in the vertical direction of the hitting face 21, there is an effect of suppressing the variation in the hitting feeling and the hitting sound.

[0057] FIGS. 9 to 11 are a rear view, a cross-sectional view taken along line X-X of FIG. 9, and a perspective view of the head 1 of another embodiment. As shown in FIGS. 9 to 11, the head 1 of this embodiment differs from the embodiments of FIGS. 1 to 4 in the configuration of the frame portion 40. In this embodiment, the frame portion 40 includes an extension portion 70 that extends locally toward the face center side in the rear view of FIG. 9.

[0058] The extension part 70 of the present embodiment is formed on the sole side frame 42. The extension part 70 may be provided at other parts. The extension part 70 is formed larger than the face thickness at the raised part 50. Further, the extension part 70 has, for example, a width in the toe-heel direction larger than that of the raised part 50, and in the present embodiment, it extends on both sides of the raised part 50 in the toe-heel direction. Such a head 1 can significantly increase the bending rigidity of the lower side of the hitting face 21 where the ball is frequently hit, and can provide an effect of increasing the backspin of the ball and a stable and good hitting feeling.

[0059] FIG. 13 shows, as still another embodiment, a cross-sectional view of the face 2. This cross-sectional view corresponds to the face cross-section of FIG. 6. As shown in FIG. 13, the face 2 includes a first portion 101 made of a first material M1 that forms the hitting face 21, and a second portion 102 made of a second material M2 that forms the raised part 50.

[0060] In the present embodiment, the first portion 101 is plate-shaped with a substantially constant thickness. The second portion 102 of the present embodiment has a triangular cross-section and is fixed to the rear surface of the first portion 101. Further, the second material M2 has a higher elastic modulus than the first material M1. In such an embodiment, there is an advantage that the bending rigidity of the face 2 and the like can be effectively increased with a smaller raised part 50 as compared with the case where the face 2 is formed of a single material.

[0061] As described above, the embodiments of the present invention have been described in detail, but the present invention is not limited to the above specific disclosure, and various modifications can be made and implemented within the scope of the technical idea described in the claims.

Example

[0062] Golf clubs equipped with the heads shown in FIGS. 1 to 4 were prototyped based on the specifications in Table 1. Then, using these golf clubs, the amount of backspin of the hit ball, the launch speed, the hitting feeling, and the hitting sound were evaluated. The evaluation method is as follows.

[0063] [Backspin amount and launch speed of the hit ball] Each golf club was attached to a swing robot, and 10 balls were hit one by one at the same head speed. The backspin amount and launch speed of the hit ball were measured, and the average value of 10 shots was obtained. In Table 1, the average value of the comparative example is set as 100, and the larger the numerical value, the better.

[0064] [Feeling of hitting the ball and hitting sound] Twenty advanced tester hit 5 balls each with each prototype golf club, and a five - level sensory evaluation was conducted on the feeling of hitting the ball and the hitting sound. The higher the score, the higher the evaluation. In Table 1, the average value of the evaluation scores of 20 people is shown.

Table 1

[0065] As a result of the test, it was confirmed that the examples gave more backspin to the hit ball without deteriorating the hitting sound and the feeling of hitting the ball compared to the comparative examples.

Explanation of symbols

[0066] 1 Head 2 Face 3 Top 4 Sole 5 Toe 6 Heel 21 Hitting face 22 Back surface 30 Cavity part 40 Frame part 41 Top - side frame 42 Sole - side frame 50 Protrusion 51 Top part 52 Inclined surface 60 Thin - wall part 101 First part 102 Second part

Claims

1. An iron-type golf club head including a face, wherein the face includes a striking face, a back face opposite to the striking face, and a face thickness defined therebetween, a cavity portion recessed toward the striking face side is formed in the back face, a raised portion that partially increases the face thickness is formed in the cavity portion, the raised portion extends in the head vertical direction, in a face cross section along the toe-heel direction orthogonal to the striking face, the raised portion includes a top portion having the largest thickness at the raised portion, and a pair of inclined surfaces extending from the top portion such that the face thickness decreases toward the toe side and the heel side of the cavity portion, the width of the raised portion in the toe-heel direction changes in the head vertical direction, the maximum face thickness at the raised portion increases toward the sole side, A golf club head.

2. An iron-type golf club head including a face, wherein the face includes a striking face, a back face opposite to the striking face, and a face thickness defined therebetween, a cavity portion recessed toward the striking face side is formed in the back face, a raised portion that partially increases the face thickness is formed in the cavity portion, the raised portion extends in the head vertical direction, in a face cross section along the toe-heel direction orthogonal to the striking face, the raised portion includes a top portion having the largest thickness at the raised portion, and a pair of inclined surfaces extending from the top portion such that the face thickness decreases toward the toe side and the heel side of the cavity portion, a frame portion surrounding the cavity portion is formed in the back face, the frame portion includes a top-side frame and a sole-side frame, in a rear view of the head, the sole-side frame includes an extension portion extending locally toward the face center side, the face thickness at the extension portion is formed larger than the face thickness at the raised portion, the extension portion has a width in the toe-heel direction larger than the width of the raised portion in the toe-heel direction, the raised portion has a top-side end connected to the top-side frame, the raised portion has a sole-side end connected to the extension portion. A golf club head. **Claim 3**: The golf club head according to claim 1 or 2, wherein the top is located within 5 mm from the center position in the toe-heel direction of the striking face in the toe-heel direction. **Claim 4**: A frame portion surrounding the cavity portion is formed on the back surface, the frame portion includes a top-side frame, The golf club head according to claim 1, wherein the raised portion is connected to the top-side frame. **Claim 5**: A frame portion surrounding the cavity portion is formed on the back surface, the frame portion includes a sole-side frame, The golf club head according to claim 4, wherein the raised portion is connected to the sole-side frame. **Claim 6**: The golf club head according to any one of claims 1 to 5, wherein the face thickness at the raised portion is 4 mm or more. **Claim 7**: The golf club head according to any one of claims 1 to 6, wherein the cavity portion includes a thin portion with a face thickness of 3 mm or less on the toe side and / or the heel side of the raised portion. **Claim 8**: The golf club head according to any one of claims 1 to 7, wherein the length of the raised portion in the head vertical direction is 5 mm or more. **Claim 9**: The golf club head according to any one of claims 1 to 8, wherein the width W of the raised portion in the toe-heel direction is 10% or more of the face length FL which is the length of the face in the toe-heel direction. **Claim 10**: The golf club head according to claim 9, wherein the width W of the raised portion is 15% or more of the face length FL. **Claim 11**: The golf club head according to any one of claims 1 to 10, wherein the width of the raised portion in the toe-heel direction increases toward the sole side. **Claim 12**: The face includes a first portion made of a first material forming the striking face and a second portion made of a second material forming the raised portion, The golf club head according to any one of claims 1 to 11, wherein the second material has a higher elastic modulus than the first material. **Claim 13**: The golf club head according to any one of claims 1 to 12, wherein the face thickness continuously decreases on the pair of inclined surfaces. **Claim 14**: The golf club head according to any one of claims 1 to 13, wherein the face thickness decreases stepwise on the pair of inclined surfaces.

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