Golf club head

Abstract

To provide a golf club head enabling repulsion performance thereof to be improved without sacrificing an advantage obtained by a cavity back.SOLUTION: A golf club head 1 having a face is provided. The face comprises a striking face for striking a ball, a back face 22 at an opposite side of the striking face, and a head outside surface extending therebetween. The back face 22 comprises a cavity portion 30 recessed to a striking face side, and a frame portion 40 extending along the head outside surface in such a way as to surround the cavity portion 30. The frame portion 40 comprises a recess 50. The recess 50 extends along the striking face and is open on the head outside surface. In the recess 50, thickness of a face from the striking face to the back face 22 is locally small.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to golf club heads. [Background technology]

[0002] The following Patent Document 1 discloses a cavity-back golf club in which a cavity is 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] A cavity-back golf club head has the advantage that a large amount of weight is distributed around the periphery of the face, which increases the moment of inertia of the head and stabilizes the direction of the hit ball.

[0005] On the other hand, cavity-back golf club heads have a thick frame that surrounds the cavity, making it difficult for the face to flex when hitting the ball, and as a result, there is room for further improvement in repulsion performance.

[0006] The present disclosure has been devised in consideration of the above problems, and has as its main object to provide a golf club head that can improve repulsion performance without compromising the advantages of a cavity back. [Means for solving the problem]

[0007] The present disclosure relates to a golf club head having a face, the face comprising a striking face for striking a ball, a back face opposite the striking face, and an outer surface of the head extending between them, the back face being provided with a cavity portion recessed toward the striking face and a frame portion extending along the outer surface of the head to surround the cavity portion, the frame portion being provided with a recess, the recess extending along the striking face and opening at the outer surface of the head. [Effects of the Invention]

[0008] By adopting the above-described configuration, the golf club head of the present disclosure can improve repulsion performance without losing the advantages of the cavity back. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a front view of a golf club head according to a first embodiment. [Figure 2] 1 is a side view of a golf club head according to a first embodiment, viewed from the toe side. [Figure 3] FIG. 2 is a rear view of the golf club head of the first embodiment. [Figure 4] 1 is a perspective view of a golf club head according to a first embodiment. [Figure 5] FIG. 2 is a perspective view for explaining a reference state of the golf club head. [Figure 6] 1 is a rear view of the golf club head of the first embodiment with the striking face held vertical. FIG. [Figure 7] 1 is an exploded perspective view of a golf club head according to a first embodiment, viewed from the front side. [Figure 8] 1 is an exploded perspective view of a golf club head according to a first embodiment, viewed from the rear side. [Figure 9] FIG. 10 is a rear view of the golf club head showing a modified example of the recessed portion. [Figure 10]FIG. 10 is a rear view of the golf club head of the second embodiment with the striking face held vertical. [Figure 11] FIG. 10 is a perspective view of a golf club head according to a second embodiment. [Figure 12] FIG. 10 is a side view of a golf club head according to a second embodiment, as viewed from the toe side. [Figure 13] 12. Cross-sectional view taken along line XIII-XIII. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, several embodiments of the present disclosure will be described with reference to the drawings. The embodiments described herein are not intended to limit the present disclosure in any way. Furthermore, each embodiment may be used alone or in various combinations. Furthermore, throughout this specification, identical or common elements are designated by the same reference numerals, and redundant descriptions are omitted.

[0011] [First embodiment] 1 to 4 are a front view, a side view seen from the toe side, a rear view, and a perspective view, respectively, of an iron-type golf club head (hereinafter sometimes simply referred to as a "head") 1 of a first embodiment.

[0012] 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 this embodiment is, for example, an iron-type golf club head made of a metal material.

[0013] The face 2 has a hitting face 21, which is the surface for hitting a ball. A plurality of face lines 8 are formed on the hitting face 21 in order to increase friction with the ball. In this embodiment, the face lines 8 are, for example, narrow grooves extending linearly in the toe-heel direction. The face lines 8 are formed in the main hitting area intended for the head 1. Note that the face lines 8 are omitted in some of the drawings.

[0014] [Reference condition] 1 to 4, the head 1 is in a reference state. In this specification, the "reference state" of the head 1 refers to a state in which the head 1 is placed on a horizontal plane HP so that the face line 8 formed on the hitting face 21 is parallel to the horizontal plane HP, as conceptually shown in FIG. 5. In addition, in the reference state, the center axis CL (axis of the club shaft) of the hosel 7 of the head 1 is disposed 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. In addition, in FIG. 5, α represents the lie angle, and β represents the loft angle. In this specification and the claims, unless otherwise specified, the configuration of each part will be described assuming that the head 1 is placed in the reference state.

[0015] [Head direction] Referring to Figure 5, the front side of the head 1 refers to the side of the hitting face 21. The rear or back side of the head 1 refers to the side of the back face 22. The front-to-rear direction of the head in Figure 5 is the direction of the x-axis, which is perpendicular to the reference vertical plane VP. The toe-heel direction of the head 1 is the direction of the horizontal y-axis, which is perpendicular to the front-to-rear direction of the head. The up-down direction of the head 1 is the direction of the z-axis, which is perpendicular to both the x-axis and the y-axis. The "upper side" and "lower side" of the head 1 refer to the "upper side" and "lower side" in the reference state, respectively.

[0016] [Head structure] As shown in Figures 2 and 3, the face 2 has a hitting face 21 and a back face 22, which is the surface opposite the hitting face 21. In this embodiment, the hitting face 21 is formed as a flat surface. The face 2 also has a head outer surface 23 extending between the hitting face 21 and the back face 22. In this specification, the thickness of the continuous solid portion from the hitting face 21 to the back face 22 is defined as the face thickness T. The face thickness T is measured in a direction perpendicular to the hitting face 21. Figure 2 shows the face thickness T at two different positions.

[0017] The top 3 extends, for example, from the upper edge of the hitting face 21 to the rear of the head 1 and forms the upper surface portion of the head 1 .

[0018] The sole 4 extends from the lower edge of the hitting face 21 to the rear of the head 1 and forms the lower surface of the head 1 .

[0019] As shown in FIG. 1, the toe 5 is the end portion of the head 1 that is farthest from the hosel 7 in the toe-heel direction, and smoothly connects the top 3 and the sole 4 .

[0020] The heel 6 is an end portion located on the opposite side to the toe 5 in the toe-heel direction of the head 1, and a hosel 7 is connected to the end portion.

[0021] The top 3, the sole 4, the toe 5 and the heel 6 are each components of the outer surface 23 of the head.

[0022] The hosel 7 has a shaft insertion hole 7a for receiving a club shaft (not shown). A central axis CL of the hosel 7 is defined by the central axis of the shaft insertion hole 7a.

[0023] 3, the back face 22 of the head 1 of this embodiment is formed with a cavity portion 30 recessed toward the hitting face 21, and a frame portion 40 extending along the head outer surface 23 to surround the cavity portion 30. The face thickness T of the cavity portion 30 is formed to be relatively small. On the other hand, the face thickness T of the frame portion 40 is greater than that of the cavity portion 30.

[0024] The frame portion 40 of this embodiment includes, for example, 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.

[0025] The cavity-back head 1 described above has a large moment of inertia around the center of gravity of the head because a large amount of weight is distributed around the periphery of the face 2. Therefore, the head 1 of this embodiment can suppress undesirable rotational movement of the face 2 when the ball is struck at a position outside the sweet spot of the striking face 21. This helps stabilize the direction of the ball.

[0026] Although not particularly limited, in order to effectively exhibit this effect, the face thickness T of the frame portion 40 is desirably, for example, 5 mm or more, more preferably 6 mm or more. Similarly, the face thickness T of the cavity portion 30 is desirably, for example, 3.0 mm or less, more preferably 2.8 mm or less. Furthermore, in order to provide the cavity portion 30 with sufficient durability, the face thickness T of the cavity portion 30 is, for example, 1.4 mm or more, preferably 1.6 mm or more, more preferably 1.8 mm or more.

[0027] Recess The frame portion 40 is provided with a recess 50. In this embodiment, the recess 50 extends along the hitting face 21 and opens at the head outer surface 23. This causes the face thickness T at the recess 50 to be locally reduced.

[0028] Such recesses 50 increase the deflection of the face 2 when hitting the ball, improving resilience performance. For example, the portion provided with the recesses 50 can deform significantly at the moment of hitting the ball, and the subsequent bending back improves resilience performance. Furthermore, since the deflection of the face 2 increases in the portion provided with the recesses 50, the high-resilience area of the face 2 is expanded. In this way, the head 1 of this embodiment can improve resilience performance without losing the advantages of the cavity back. Note that the head 1 of the present disclosure can achieve the above-mentioned effects as long as it is provided with at least one recess 50.

[0029] The recess 50 of this embodiment has a pair of groove walls 50e, 50e (FIG. 2) and is groove-shaped and opens at the back face 22. Therefore, the recess 50 of this embodiment can be seen from the back face 22 side. One end of the recess 50 of this embodiment also opens at the cavity portion 30. That is, the recess 50 of this embodiment extends continuously from the cavity portion 30 to the head outer surface 23 and divides the frame portion 40. Therefore, the recess 50 of this embodiment locally reduces the rigidity of the frame portion 40, allowing the face 2 to bend more greatly when hitting a ball.

[0030] Recess Location The position of the recess 50 is not particularly limited, and the recess may be provided in various positions. In the embodiment shown in Figs. 3 and 4, the recess 50 includes, for example, a toe-side recess 501 provided on the toe side. The toe-side recess 501 is formed, for example, in the toe-side frame 43. As shown in Fig. 2, the toe-side recess 501 opens on the head outer surface 23 on the toe side in a side view of the head 1 seen from the toe side.

[0031] Generally, iron-type heads 1 tend to be formed with a large face thickness T at the toe-side frame 43. Therefore, by providing the toe-side recess 501, the deflection of the face 2 when hitting the ball can be increased, and the repulsion performance can be more effectively improved.

[0032] From a similar perspective, the recess 50 may include a heel-side recess 502 provided on the heel side, as shown in Fig. 3. The heel-side recess 502 is formed, for example, in the heel-side frame 44. The heel-side recess 502 opens on the head lateral surface 23 on the heel side in a side view of the head 1 seen from the heel side. The heel-side recess 502 may be provided instead of or together with the toe-side recess 501.

[0033] FIG. 6 is a rear view of the head 1 with the hitting face 21 positioned vertically. This state can be achieved by rotating the head 1 from the reference state by a loft angle B around a horizontal axis parallel to the toe-heel direction. When the recessed portion 50 includes a toe-side recessed portion 501 and a heel-side recessed portion 502, the toe-side recessed portion 501 and the heel-side recessed portion 502 are formed so as to at least partially overlap in the head up-down direction in a rear view of the head 1 viewed from a direction perpendicular to the hitting face 21. In this configuration, the toe-side recessed portion 501, the cavity portion 30, and the heel-side recessed portion 502 are continuous along the toe-heel direction. This makes it easier for the face 2 to bend about the horizontal axis in the toe-heel direction over a wider range in the toe-heel direction when hitting a ball, thereby further improving resilience performance. In one such embodiment, in the rear view of the head 1 shown in Figure 6, the toe-side recess 501 and the heel-side recess 502 can be arranged so that an imaginary straight line SL can be drawn that passes completely through both of these recesses 501 and 502 without extending beyond the toe-side recess 501 and the heel-side recess 502. In this case, the angle of the imaginary line SL with respect to the horizontal plane HP is preferably, for example, 0 degrees ± 15 degrees, more preferably 0 degrees ± 10 degrees, and even more preferably 0 degrees ± 5 degrees. This embodiment is expected to have the effect of promoting bending deformation of the hitting face 21 along the imaginary line SL.

[0034] In a more preferred embodiment, the toe-side recess 501 and the heel-side recess 502 are located at the same height in the rear view of the head 1 shown in FIG. 6 . In this embodiment, the face 2 is more likely to bend about the horizontal axis in the toe-heel direction over a wide range in the toe-heel direction when hitting a ball, thereby further improving resilience performance. In this specification, the term "same height" refers to an embodiment in which the difference between the heights h1 and h2 of the vertical center positions P1 and P2 of the toe-side recess 501 and the heel-side recess 502 from the horizontal plane HP in the rear view of FIG. 6 is within 5 mm, more preferably within 3 mm, and even more preferably zero. In this specification, the vertical center positions P1 and P2 of the toe-side recess 501 and the heel-side recess 502 are defined as intermediate positions between the topmost portion 50a and the bottommost portion 50b of the recess 50 appearing on the back face 22 in the rear view of FIG. 6 .

[0035] In a preferred embodiment, the heights h1 and h2 of the recesses 50 are preferably set to coincide with or approximate the vertical position of a typical impact point of a golfer who is the intended user of the head 1. This allows the part of the face 2 that is most likely to bend to be positioned at the golfer's impact point when hitting the ball, allowing the face 2 to bend more effectively. This improves the repulsion performance during actual impact.

[0036] Generally, the impact point of an iron-type head 1 varies depending on the loft angle. For example, the impact point of an average golfer is located approximately 12.5 mm above the horizontal plane HP for a head with a loft angle of approximately 27°±3°, approximately 11.5 mm above the horizontal plane HP for a head with a loft angle of approximately 34°±4°, and approximately 10.5 mm above the horizontal plane HP for a head with a loft angle of more than 38°. Therefore, it is desirable to set the heights h1 and h2 of the recesses 50 to coincide with the above-described impact point of the golfer depending on the loft angle of the head 1. This group of heads 1 provides a golf club set in which the vertical center position of the recesses 50 gradually decreases as the loft angle increases.

[0037] [Size of recess] The size of the recess 50 is not particularly limited and can be set to various sizes. However, in order to more effectively utilize the function of the recess 50, it is desirable to specify the width W and depth D of the recess 50.

[0038] As shown in FIGS. 2 and 6, in a rear view of the head 1 taken from a direction perpendicular to the striking face 21, the width W of the recess 50 is measured as the shortest distance between a pair of groove walls 50e, 50e (shown in FIG. 2) of the recess 50. If the width W of the recess 50 varies, it is specified as the maximum width. The width W of the recess 50 is, for example, 1.0 mm or more, preferably 2.0 mm or more, and more preferably 3.0 mm or more. On the other hand, if the width W of the recess 50 is excessively large, the weight therein tends to be reduced, which in turn tends to diminish the advantages of the cavity back. From this perspective, the width W of the recess 50 is, for example, 10.0 mm or less, preferably 9.0 mm or less, and more preferably 8.0 mm or less.

[0039] As shown in FIG. 2 , the depth D of the recess 50 is measured in a direction perpendicular to the striking face 21. The depth D of the recess 50 determines the face thickness T of the portion where the recess 50 is provided. In a preferred embodiment, by adjusting the depth D of the recess 50, the face thickness T of the portion where the recess 50 is provided is set to, for example, 3.2 mm or less, preferably 3.0 mm or less, and more preferably 2.8 mm or less. On the other hand, if the depth D of the recess 50 is excessively large, the weight at that portion tends to be reduced, and the advantages of the cavity back tend to be lost. From this perspective, the face thickness T of the portion where the recess 50 is provided is set to, for example, 1.7 mm or more, preferably 1.8 mm or more, and more preferably 1.9 mm or more.

[0040] [Head structure] The head 1 can be manufactured in a variety of ways. In one embodiment, the head 1 can be manufactured as a one-piece structure by a variety of methods, such as casting, forging, sintering, etc.

[0041] In another embodiment, the head 1 may have a multi-piece structure in which two or more members are joined together. Figures 7 and 8 show exploded perspective views of such a head 1. As shown in Figures 7 and 8, the head 1 includes, for example, a face plate 100 and a head body 200 that supports the face plate 100 from the rear of the head.

[0042] The face plate 100 is formed in a plate shape made of, for example, a metal material. The face plate 100 of this embodiment includes a first surface S1 that forms the striking face 21, a second surface S2 on the opposite side thereof, and a third surface S3 that connects the first surface S1 and the second surface S2. The third surface S3 is a side surface of the face plate 100.

[0043] The head body 200 includes, for example, a hosel 7 and a support portion 210.

[0044] The support portion 210 extends along the head outer surface 23 so as to surround the cavity portion 30 (shown in FIG. 2). The support portion 210 also supports the second surface S2 of the face plate 100 from behind. As a result, the support portion 210 is joined to the second surface S2 of the face plate 100 to form the frame portion 40.

[0045] The support portion 210 of this embodiment includes a top side support portion 211, a sole side support portion 212, a toe side support portion 213, and a heel side support portion 214 that support the top side, sole side, toe side, and heel side of the face plate 100, respectively.

[0046] The top-side support portion 211, the sole-side support portion 212, and the toe-side support portion 213 each support only the second surface S2 of the face plate 100, and do not support the third surface S3 of the face plate 100. On the other hand, the heel-side support portion 214 supports the second surface S2 and the third surface S3 of the face plate 100. As a result, in the head main body 200 of this embodiment, the top side surface, the toe side surface, and the sole side surface of the third surface S3 of the face plate 100 are exposed to the head lateral surface 23. In other words, the top side surface, the toe side surface, and the sole side surface of the third surface S3 of the face plate 100 form a front portion of the head lateral surface 23.

[0047] The head body 200 of this embodiment also includes a dividing portion 220. The dividing portion 220 is a portion where the continuity of the support portion 210 along the lateral surface 23 of the head is interrupted. The dividing portion 220 of this embodiment is a space formed between the toe-side support portion 213 and the sole-side support portion 212. This dividing portion 220 forms a toe-side recess 501 in which the second surface S2 is exposed rearward of the head up to the third surface S3. That is, the toe-side recess 501 is a groove-like shape extending along the hitting face 21, with one end opening to the cavity portion 30 and the other end opening to the lateral surface 23 of the head. The bottom surface 50f (shown by an imaginary line in FIG. 8 ) of the toe-side recess 501 is formed by a portion of the second surface S2 of the face plate 100.

[0048] 7 and 8, the heel-side recess 502 is a groove-like depression formed between the heel-side support portion 214 and the sole-side support portion 212. In another embodiment, the heel-side recess 502 may also be formed like the dividing portion 220. In this case, the sole-side support portion 212 of the head main body 200 is an independent member.

[0049] As described above, when the head 1 is formed by joining two or more components, the face plate 100 can be made of a metal material with a lower specific gravity and / or lower elasticity than the head body 200, making it possible to provide an even greater moment of inertia and / or rebound performance.

[0050] [Variations in the position of the recess] Figure 9 is a rear view of the hitting face 21 in a vertical position. As shown in Figure 9, the recess 50 may be a top-side recess 503 provided on the top 3 side and / or a sole-side recess 504 provided on the sole 4 side. The top-side recess 503 is formed in the top-side frame 41. The sole-side recess 504 is formed in the sole-side frame 42. Even in this embodiment, when hitting a ball, elastic deformation such that the face 2 bends along the vertical axis is promoted, and the subsequent return to normal bending improves resilience performance.

[0051] In a preferred embodiment, the top-side recess 503 and the sole-side recess 504 are formed so as to overlap at least partially in the toe-heel direction. In this embodiment, the top-side recess 503, the cavity portion 30, and the sole-side recess 504 are continuous in the vertical direction. Therefore, when hitting a ball, the face 2 is more likely to bend over a wider range in the vertical direction about the vertical axis along the hitting face 21, thereby further improving resilience performance.

[0052] In a particularly preferred embodiment, the top-side recess 503 and the sole-side recess 504 are located at the same position in the toe-heel direction when viewed from the back of the head. Here, "the same position" in the toe-heel direction refers to an embodiment in which, when viewed from the back of the head, the distance in the toe-heel direction between the center positions P3 and P4 of the top-side recess 503 and the heel-side recess 502, respectively, is within 5 mm, more preferably within 3 mm, and even more preferably zero. Furthermore, in this specification, the center positions P3 and P4 in the toe-heel direction of the top-side recess 503 and the sole-side recess 504, respectively, are defined as intermediate positions between the toe-most position 50c and the heel-most position 50d of the recess 50 appearing on the back face 22 in the rear view of FIG. 9.

[0053] In the above embodiment, the recess 50 is left as a space. In another aspect, the recess may be filled with an elastic material such as rubber or elastomer that does not hinder the elastic deformation of the face 2.

[0054] [Second embodiment] 10 to 13 are a rear view, a perspective view, a side view seen from the toe side, and a cross-sectional view taken along line XIII-XIII in Fig. 12 of the head 1 of the second embodiment. The head 1 of the second embodiment differs from the first embodiment only in the shape of the recess 50, and the rest of the structure is the same.

[0055] 10 to 13, in the head 1 of the second embodiment, the recess 50 extends along the hitting face 21 but does not open to the head outer surface 23. Furthermore, the thickness t between the recess 50 and the head outer surface 23 is set to 2 mm or less, preferably 1.5 mm or less, and more preferably 1.0 mm or less.

[0056] The recessed portion 50 of this embodiment does not open to the outer surface 23 of the head, but extends to the vicinity of the outer surface 23. Therefore, the recessed portion 50 of the second embodiment also increases the deflection of the face 2 when hitting a ball, improving the repulsion performance.

[0057] Although the embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the above specific disclosure, and can be implemented with various modifications within the scope of the technical idea described in the claims. [Example]

[0058] More specific, non-limiting examples of the present disclosure are described below. Two-piece iron-type golf club heads having the basic structure shown in Figures 1 to 4 and 7 to 9 were designed with the specifications shown in Table 1, and computer simulation tests were conducted on them to determine the resilience performance, launch angle of the ball, and moment of inertia. The basic specifications of the heads are as follows: Loft angle: 22° Head weight: 246(g) Faceplate Material: Spring Steel Head body material: S20C Face thickness at cavity: 2.7mm (with common thickness distribution) The test method is as follows.

[0059] [Rebound performance] As a measure of resilience, COR was calculated by computer simulation. COR, which stands for Coefficient of Restitution, was calculated based on the "Interim Procedure for Measuring the Coefficient of Restitution of an Iron Clubhead Relative to a Baseline Plate Revision 1.3 January 1, 2006" prescribed by the USGA (United States Golf Association). The results are expressed as an index, with the COR value of the comparative example being 100. The higher the value, the better the resilience of the face at the measurement location. The COR value was calculated at the sweet spot.

[0060] [Launch angle of the ball] A hitting simulation was performed with each golf club head model, and the launch angle of the ball relative to the horizontal plane was calculated. Table 1 shows the index, with the comparative example's value set at 100, and the larger the value, the greater the better the launch angle.

[0061] [Moment of inertia] In order to evaluate only the effect of the recess formed in the frame as much as possible, a virtual weight that does not affect the deformation of the head was placed in the recess without contact, and the simulation was performed under conditions where the head weight and moment of inertia were consistent. Note that the moment of inertia is the moment of inertia around the horizontal axis in the toe-heel direction that passes through the center of gravity of the head, and in Table 1, the moment of inertia of the comparative example is an index of 100, and all are the same. The test results are shown in Table 1.

[0062] [Table 1]

[0063] The test results confirmed that the golf club heads of the examples had higher resilience performance and higher launch angles than the comparative examples. Also, the golf club heads of the examples had slightly lower moment of inertia than the comparative examples, but this was within the acceptable range.

[0064] [This Disclosure] The present disclosure includes the following aspects. The present disclosure (1) provides a golf club head having a face, The face includes a hitting face for hitting a ball, a back face opposite the hitting face, and an outer surface of the head extending therebetween, The back face is provided with a cavity portion recessed toward the hitting face side, and a frame portion extending along the outer surface of the head so as to surround the cavity portion, The frame portion is provided with a recess, The recess extends along the striking face and opens at the head outer surface. A golf club head.

[0065] The present disclosure (2) is the golf club head according to the present disclosure (1), wherein the recessed portion is a groove-like portion that opens at the back face.

[0066] The present disclosure (3) is the golf club head according to the present disclosure (1) or (2), wherein the recessed portion includes a toe-side recessed portion provided on the toe side.

[0067] The present disclosure (4) is a golf club head in any combination with any of the present disclosures (1) to (3), in which the recessed portion includes a heel-side recessed portion provided on the heel side.

[0068] The present disclosure (5) is a golf club having a toe-side recess provided on the toe side and a heel-side recess provided on the heel side, A golf club head according to disclosure (1) or (2), wherein, in a rear view seen from a direction perpendicular to the striking face, the toe-side recess and the heel-side recess are formed so as to overlap in the vertical direction of the head.

[0069] The present disclosure (6) is a golf club head in any combination with any of the present disclosures (1) to (5), in which the recessed portion is open to the cavity portion.

[0070] The present disclosure (7) provides a golf club head including a face plate and a head body that supports the face plate, the face plate includes a first surface forming the striking face, a second surface opposite the first surface, and a third surface connecting the first surface and the second surface; the head body includes a support portion extending along the outer surface of the head so as to surround the cavity portion, the support portion supports the second surface of the face plate, the head body includes a divided portion where continuity of the support portion along the outer surface of the head is interrupted, The golf club head is any combination of any of the present disclosures (1) to (6), wherein the dividing portion forms the recessed portion in which the second surface is exposed at the rear of the head.

[0071] The present disclosure (8) provides a golf club head having a face, The face includes a hitting face for hitting a ball, a back face opposite the hitting face, and an outer surface of the head extending therebetween, The back face is provided with a cavity portion recessed toward the hitting face side, and a frame portion extending along the outer surface of the head so as to surround the cavity portion, The frame portion is provided with a recess, the recess extends along the striking face and does not open to the outer surface of the head; The thickness between the recess and the outer surface of the head is 2 mm or less. A golf club head.

[0072] The present disclosure (9) is the golf club head according to the present disclosure (8), wherein the recessed portion is a groove-like portion that opens at the back face.

[0073] The present disclosure (10) is the golf club head according to the present disclosure (8) or (9), wherein the recessed portion includes a toe-side recessed portion that opens to the toe side of the cavity portion.

[0074] The present disclosure (11) is a golf club head in any combination with any of the present disclosures (8) to (10), wherein the recessed portion includes a heel-side recessed portion that opens to the heel side of the cavity portion. [Explanation of symbols]

[0075] 1 golf club head 2 faces 5 Tou 6 Heel 21 hitting face 22 back face 23 Outer surface of head 30 Cavity 40 Frame section 50 recess 100 faceplates 200 Head body 210 Support part 220 Divided Section 501 Toe side recess 502 Heel side recess S1: 1st page S2: 2nd side S3:Side 3

Claims

1. A golf club head having a face, The face includes a hitting face for hitting a ball, a back face opposite the hitting face, and an outer surface of the head extending therebetween, The back face is provided with a cavity portion recessed toward the hitting face side, and a frame portion extending along the outer surface of the head so as to surround the cavity portion, The frame portion is provided with a recess, the recess extends along the striking face and opens at the head outer surface; the recessed portion includes a toe-side recessed portion provided on a toe side and a heel-side recessed portion provided on a heel side, In a rear view seen from a direction perpendicular to the hitting face, the toe-side recess and the heel-side recess are formed to overlap in the head up-down direction. Golf club head.

2. The golf club head according to claim 1 , wherein the recessed portion is a groove that opens at the back face.

3. 3. The golf club head according to claim 1, wherein the recessed portion is open to the cavity portion.

4. The golf club head includes a face plate and a head body that supports the face plate. the face plate includes a first surface forming the striking face, a second surface opposite the first surface, and a third surface connecting the first surface and the second surface; the head body includes a support portion extending along the outer surface of the head so as to surround the cavity portion, the support portion supports the second surface of the face plate, the head body includes a divided portion where continuity of the support portion along the outer surface of the head is interrupted, 4. The golf club head according to claim 1, wherein the dividing portion forms the recessed portion where the second surface is exposed at the rear of the head.

5. A golf club head having a face, The face includes a hitting face for hitting a ball, a back face opposite the hitting face, and an outer surface of the head extending therebetween, The back face is provided with a cavity portion recessed toward the hitting face side, and a frame portion extending along the outer surface of the head so as to surround the cavity portion, The frame portion is provided with a recess, the recess extends along the striking face and opens at the head outer surface; The golf club head includes a face plate and a head body that supports the face plate. the face plate includes a first surface forming the striking face, a second surface opposite the first surface, and a third surface connecting the first surface and the second surface; the head body includes a hosel and a support portion extending along the outer surface of the head so as to surround the cavity portion, the support portion supports the second surface of the face plate, the head body includes a divided portion where continuity of the support portion along the outer surface of the head is interrupted, The dividing portion forms the recessed portion where the second surface is exposed to the rear of the head. Golf club head.

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