Golf club head

Abstract

Provided is a golf club head capable of achieving high joint strength between a metal-made club head main body and an FRP member while prolonging the sound of a hitting sound. The golf club head includes a metal-made club head main body (1A) formed with an opening portion, and an FRP member (1B) fixedly combined with the club head main body (1A) in a manner of plugging the opening portion. A support portion (7) having a first surface (7a) that supports the FRP member (1B) is provided around the opening portion of the club head main body (1A). At least one fine groove (9) having a groove width (w) of 20 to 80 μm and a groove depth (d) of 100 to 400 μm is formed in the first surface (7a). The FRP member (1B) is a fiber-reinforced plastic including a fiber and a thermoplastic resin (10), and a portion of the thermoplastic resin (10) is cured inside the fine groove (9).

Description

Technical Field

[0001] This invention relates to a golf club head. Background Technology

[0002] A golf club head using fiber-reinforced plastic (FRP) components at the top and / or sole is proposed. By using FRP components, the top and / or sole are made lighter. The weight reduction from the top and / or sole provides a carefully determined weight margin that can be used to optimize the clubhead's center of gravity, moment of inertia, etc.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1

[0006] Japanese Patent Application Publication No. 2020-43945

[0007] The problem that the invention aims to solve

[0008] The aforementioned golf club heads need to ensure sufficient bonding strength between the metal clubhead body and the FRP (fiberglass reinforced plastic) components. Furthermore, golf club heads using FRP components also present the problem of a short-lasting sound upon impact. Summary of the Invention

[0009] The present invention was made in view of the above-mentioned problems, and its object is to provide a golf club head that can achieve high bonding strength between the metal club head body and the FRP component while prolonging the sound of the impact.

[0010] Technical means for solving problems

[0011] This invention relates to a golf club head, comprising a metal club head body with an opening and an FRP (fiberglass reinforced plastic) component fixedly connected to the club head body in a manner that seals the opening. A support portion is provided around the opening of the club head body, the support portion having a first surface supporting the FRP component. At least one fine groove with a groove width of 20-80 μm and a groove depth of 100-400 μm is formed on the first surface. The FRP component is a fiber-reinforced plastic comprising fibers and thermoplastic resin, a portion of which is cured inside the fine groove.

[0012] Invention Effects

[0013] By employing the above-described structure, the golf club head of the present invention can achieve high bonding strength between the metal club head body and the FRP component while prolonging the sound of the impact. Attached Figure Description

[0014] Figure 1 This is a top view showing one embodiment of a golf club head.

[0015] Figure 2 It is an exploded 3D diagram of a golf club head.

[0016] Figure 3 This is a top view of the golf club head before the FRP components are fixed in place.

[0017] Figure 4 yes Figure 3 Sectional view along line IV-IV.

[0018] Figure 5 yes Figure 1 VV-line cross-section diagram.

[0019] Figure 6 yes Figure 4 Enlarged view of the main part of the first surface.

[0020] Figure 7 yes Figure 5 Enlarged view of the main part of the support and the boundary of the FRP component.

[0021] Figure 8 This is a cross-sectional view of the process of joining the support to the FRP component.

[0022] Figure 9 This is a cross-sectional view of the process of joining the support portion to the FRP component according to another embodiment.

[0023] Figure 10 This is a bottom view of a golf club head according to another embodiment. Detailed Implementation

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0025] It must be understood that, for the purpose of aiding in understanding the present invention, the accompanying drawings include representations with dimensions different from the actual structures. Furthermore, in this specification, the same or common elements are given the same reference numerals, and repetitive descriptions are omitted. Moreover, the specific structures shown in the embodiments and drawings are for the purpose of understanding the content of the present invention, and the present invention is not limited to the specific structures illustrated.

[0026] Figure 1 This is a top view showing one embodiment of a golf club head (hereinafter sometimes simply referred to as "club head") 1. Figure 2 Decompose its 3D diagram. Figure 1 In the middle, clubhead 1 is facing the reference position.

[0027] [Base state of the clubhead]

[0028] The reference state of clubhead 1 is when clubhead 1 is held at the loft angle and head loft angle determined by clubhead 1, and is placed on the horizontal plane HP. The loft angle and head loft angle are usually clearly stated in product catalogs, etc. In the reference state, the imaginary shaft axis CL, which serves as the axis centerline of the shaft insertion hole 5a of the clubhead 1, is positioned within any vertical plane VP. Unless otherwise specified, clubhead 1 is placed in the reference state.

[0029] [Regarding the direction of the clubhead]

[0030] In this specification, three directions are associated with the clubhead 1 in its reference state. First, the direction x, parallel to the horizontal plane HP and the vertical plane VP, is the clubhead toe / heel direction of clubhead 1. Then, the direction y, orthogonal to the vertical plane VP, is the clubhead front-back direction. In the clubhead front-back direction, the side of the clubface 2 is the front, and the opposite side is the back (also called the back side or back face). Furthermore, the direction z, orthogonal to both x and y, is the clubhead up-down direction.

[0031] [Basic Structure of the Club Head]

[0032] The clubhead 1 in this embodiment is, for example, a wood-shaped clubhead. A wood-shaped clubhead, for example, includes not only a driver (#1) but also a fairway wood. In another embodiment, the clubhead 1 may also be configured as a multi-purpose type.

[0033] The club head 1, including, for example, the face 2, the top 3, and the sole 4, has a hollow portion i formed inside in this embodiment. The hollow portion i is a cavity. A portion of the hollow portion i may be filled, for example, with a foaming agent, a gelling agent, etc.

[0034] [Club face]

[0035] The clubface is the part used to strike the ball and is formed on the front side of the clubhead 1. The outer surface (front surface) of the clubface 2 forms the striking surface 2a that contacts the ball. Although not shown, multiple grooves, referred to as clubface lines, extending in the direction of the clubhead toe / heel may also be provided in the striking surface 2a.

[0036] [Top of the pole]

[0037] The club top 3 extends from the upper edge of the clubface 2 toward the rear of the clubhead in a manner that forms the upper surface of the clubhead. The club top 3, for example, in... Figure 1 In a top view of the clubhead, the portion consisting of the clubface 2 and the clubhead bolt 5 is formed. The clubhead bolt 5 is located on the heel side of the clubhead at the top 3.

[0038] [Club sole]

[0039] The sole 4 extends from the lower edge of the face 2 toward the rear of the clubhead in a manner that forms the bottom surface of the clubhead. The sole 4, for example, forms the portion excluding the clubhead pin 5 when viewed from the bottom surface of the clubhead.

[0040] The club head 1 of this embodiment includes a metal club head body 1A having an opening 6, and an FRP member 1B that is fixedly connected to the club head body 1A in a manner that seals the opening 6. Figure 3 This is a top view of the clubhead body 1A. Figure 4 for Figure 3 Sectional view along line IV-IV, Figure 5 for Figure 1 VV-line cross-section diagram.

[0041] [Club Head Body]

[0042] The metal material constituting the clubhead body 1A is not particularly limited, but it is suitable for one or more of the following: stainless steel, martensitic steel, titanium alloy, aluminum alloy, and magnesium alloy. In this embodiment, the clubhead body 1A is entirely formed of titanium alloy.

[0043] like Figures 1-3 As shown, the clubhead body 1A of this embodiment, for example, has an opening 6 at the top 3. Specifically, the clubhead body 1A of this embodiment includes the face 2, the sole 4, the clubhead pin 5, and the portion other than the opening 6 at the top 3. Such a clubhead body 1A can be pre-formed as a single piece, or it can be formed by joining two or more parts together.

[0044] like Figure 2 and Figure 3 As shown, the opening 6 penetrates the main body 1A of the rod head and communicates with the hollow portion i. In this embodiment, the outline edge 6e of the opening 6 is housed within the rod top 3. In other embodiments, the outline edge 6e of the opening 6 may protrude from the rod top 3, or the opening 6 may be located outside the rod top 3 (described later).

[0045] like Figure 3 and Figure 4 As shown, a support portion 7 with a first surface 7a for supporting the FRP member 1B is provided around the opening 6 of the rod head body 1A. The peripheral portion of the FRP member 1B overlaps with and is fixedly connected to the support portion 7. In this embodiment, the support portion 7 is formed in a ring shape, for example, in the direction surrounding the opening 6. In other embodiments, the support portion 7 may also be formed in a non-ring shape, that is, intermittently formed around the opening 6.

[0046] The support portion 7 has a first surface 7a facing the FRP member 1B and a second surface 7b on the opposite side. Figure 6 This is an enlarged view of the main part of the first surface 7a. (See image below.) Figure 4 and Figure 6As shown, at least one groove 9 is formed on the first surface 7a. In this embodiment, multiple grooves 9 are formed on the first surface 7a.

[0047] The groove 9 has a groove width w of 20–80 μm and a groove depth d of 100–400 μm. It is also possible for the first surface 7a to include grooves that do not meet the above dimensions, but in this case, it is preferable to actively form the groove 9.

[0048] [FRP components]

[0049] In this embodiment, the FRP component 1B is a fiber-reinforced plastic (CFRTP) comprising fibers and thermoplastic resin. The FRP component 1B has a lower specific gravity than the clubhead body 1A. Therefore, in this embodiment, since a portion of the clubhead tip 3 is formed from the FRP component 1B, the upper part of the clubhead 1 is lightweight, allowing the center of gravity of the clubhead 1 to be positioned lower. Furthermore, the weight reduction from the clubhead tip 3 can be used as a carefully determined weight margin, for example, to optimize the moment of inertia of the clubhead 1.

[0050] In this embodiment, the FRP member 1B is, for example, integrally formed as a plate, with its periphery engaging with the first surface 7a of the support portion 7 of the rod head body 1A. Furthermore, as... Figure 7 As shown, a portion of the thermoplastic resin 10 of the FRP component 1B is cured inside the groove 9 of the first surface 7a. The thermoplastic resin 10 is cured inside the groove 9 in such a way that it practically completely fills the space of the groove 9.

[0051] Furthermore, in this embodiment, no adhesive is sandwiched between the FRP member 1B and the first surface 7a. That is, the first surface 7a (including the groove 9) of the support portion 7 is in direct contact with the FRP member 1B.

[0052] [Function of this embodiment (joint strength)]

[0053] In the rod head 1 of this embodiment, a portion of the thermoplastic resin of the FRP component 1B is cured inside a fine groove 9 with a specific groove width and groove depth formed on the first surface 7a of the support portion 7. Therefore, the FRP component 1B can be firmly bonded to the support portion 7 through the so-called anchoring effect.

[0054] In order to quantitatively determine the bonding strength between the rod head body 1A and the FRP component 1B, the inventors conducted a bonding strength test according to the Japanese standard JIS-K6850 "Test method for tensile shear bond strength of rigid bonded materials with adhesive".

[0055] First, experimental material 1, equivalent to that in the example, was prepared. Experimental material 1 consisted of a 6-4 titanium alloy plate with multiple fine grooves, bonded to an FRP component (100mm × 25mm × 1mm, fiber direction 0° relative to the length direction) made of carbon fiber and polyphenylene sulfide (PPS) as a thermoplastic resin. No adhesive was used to bond the two components; instead, the FRP component was brought into contact with the degreased plate, and the plate was pressed under a pressure of 3.5 MPa while being heated at 330°C for 30 minutes. The bonding area was 12.5mm × 25mm. Furthermore, the specifications of the fine grooves and groove depth on the plate surface were as follows:

[0056] Groove width: 30~71μm

[0057] Groove depth: 230~250μm

[0058] Interval: 0.083 mm (average)

[0059] Number of entries: 150

[0060] The length direction of the groove is orthogonal to the tensile shear direction.

[0061] Furthermore, experimental material 2, equivalent to the comparative example, was prepared. Experimental material 2 consisted of a degreased plate of the aforementioned 6-4 titanium alloy and the aforementioned FRP component, but without grooves formed on the surface of the plate. The surface of the plate was pre-treated with shot peening material of 100 μm. Experimental material 2 was bonded to the FRP component using an epoxy adhesive (DP420 manufactured by 3M) sandwiched between the degreased plate and the FRP component, using the same method as described above.

[0062] Next, a bond strength test was conducted according to Japanese JIS-K6850. The tensile test speed was 10 mm / min. The test results showed that the bond strength of experimental material 2 was 4 MPa, while the bond strength of experimental material 1 was five times higher, at 20 MPa. This confirms the significant advantage of experimental material 1. Those skilled in the art should understand that the high bond strength verified by this experimental material 1 can also be achieved for golf club heads.

[0063] [The function of this implementation method (the sound of the ball being hit)]

[0064] The thermoplastic resin of the FRP member 1B in this embodiment tends to have a smaller vibration attenuation rate (attenuation ratio) compared to thermosetting resins. Therefore, the vibration attenuation effect generated by the FRP member 1B during impact is suppressed, thereby prolonging the sound of the impact.

[0065] Furthermore, in existing clubheads, epoxy or acrylic adhesives are used to bond the metal to the FRP component. However, these adhesives cannot achieve sufficient bond strength between thermoplastic resins, or tend to dampen the clubhead's vibration upon impact. In this embodiment, no adhesive is sandwiched between the FRP component 1B and the support portion 7, thus improving the vibration characteristics of the clubhead 1 and resulting in a longer, more resonant impact sound.

[0066] To quantitatively understand the factors contributing to the sustained sound of a golf club impact, the inventors conducted vibration characteristic tests using experimental materials 1 and 2. The vibration characteristic tests involved fixing triangular clamps (contact plates) to the sides of the titanium alloy plates of each experimental material using instant adhesive and then mounting them to a vibrator. Furthermore, the anti-resonance peak was analyzed using a servo oscillation mode. Specifically, the attenuation (attenuation ratio) of the anti-resonance peak in the approximately 2000–4000 Hz range, which is related to the duration of the impact sound of the golf club head, was determined. A smaller attenuation ratio indicates a longer vibration duration.

[0067] The results of vibration characteristic tests confirmed that the attenuation of experimental material 2, which is equivalent to the structure of existing clubheads, is approximately 0.8–0.9%, while the attenuation of experimental material 1, which is equivalent to the example, is reduced to less than half, at 0.2–0.4%. This confirms the significant advantage of experimental material 1. Those skilled in the art should understand that the vibration characteristics (vibration persistence) verified by experimental material 1 can function to prolong the sound of the impact in a golf clubhead.

[0068] As described above, the clubhead 1 of this embodiment can achieve high bonding strength between the metal clubhead body 1A and the FRP component 1B, and can prolong the sound of the impact.

[0069] [Preferred Embodiment of the Support]

[0070] To further improve the anchoring effect, the groove depth d of the fine groove 9 is more preferably 100 μm or more, and even more preferably 200 μm or more. On the other hand, if the groove depth d of the fine groove 9 is too large, not only will the permeability of the thermoplastic resin decrease, but the strength of the support portion 7 may also decrease. From this point of view, the groove depth d of the fine groove 9 is more preferably 400 μm or less, and even more preferably 300 μm or less.

[0071] Furthermore, to further improve the aforementioned anchoring effect, the groove width w of the fine groove 9 is more preferably 80 μm or less, and even more preferably 60 μm or less, and it is desirable for the fine groove 9 to be more refined. On the other hand, if the groove width w of the fine groove 9 is too small, it is feared that the permeability of the thermoplastic resin into the fine groove will be reduced. From this perspective, the groove depth d of the fine groove 9 is more preferably 20 μm or more, and even more preferably 40 μm or more.

[0072] like Figure 6 As shown, in the groove depth direction, the fine groove 9 includes at least one first fine groove 9a whose groove width on the bottom side is greater than the groove width on the inlet side, and preferably includes multiple first fine grooves 9a whose groove width on the bottom side is greater than the groove width on the inlet side. This further improves the anchoring effect.

[0073] The spacing p (distance between the centers of the grooves) of the multiple fine grooves 9 is not particularly limited; however, if it is too small, there is a concern that the strength of the support 7 may decrease. From this perspective, the spacing p of the fine grooves 9 is preferably 0.04 mm or more, more preferably 0.06 mm or more, and even more preferably 0.08 mm or more. On the other hand, if the spacing p of the fine grooves 9 becomes larger, there is a concern that the anchoring effect may decrease. From this perspective, the spacing p of the fine grooves 9 is preferably 0.5 mm or less, more preferably 0.2 mm or less, and even more preferably 0.1 mm or less. Furthermore, considering the machinability of the fine grooves 9, the spacing p does not need to be fixed and can be left unfixed.

[0074] The orientation of the length direction of the fine groove 9 is not particularly restricted, but as... Figure 2 , Figure 3 As exaggerated in the description, in this embodiment, multiple grooves 9 extend along the contour edge 6e of the opening 6. In this case, the multiple grooves 9 can be arranged in a concentric circle or in a spiral shape. Furthermore, the length of the grooves 9 can be appropriately determined as long as it is greater than or equal to the groove width, but in this embodiment, they are approximately continuous in a ring shape along the contour edge 6e of the opening 6.

[0075] Under normal circumstances, when the clubhead 1 is used to strike the ball, a shear force orthogonally perpendicular to the contour edge 6e of the opening 6 tends to act between the first surface 7a of the support portion 7 and the FRP member 1B. Therefore, by making the groove 9 along the contour edge 6e of the opening 6, the resistance to deformation under the aforementioned shear force at the joint can be improved, and thus, even under repeated impacts, the decrease in joint strength can be suppressed.

[0076] like Figure 4 As shown, the thickness t1 of the support portion 7 is preferably less than the thickness t2 of the portion other than the support portion 7 adjacent to it. This allows for further weight reduction of the club top 3, resulting in a lower center of gravity and a larger, carefully determined weight margin. In a preferred embodiment, the thickness t1 of the support portion 7 is, for example, 1.2 mm or less, preferably 1.1 mm or less, and more preferably 1.0 mm or less. On the other hand, if the thickness t1 of the support portion 7 is too small, there is a concern about reduced strength. From this perspective, the thickness t1 of the support portion 7 is, for example, 0.5 mm or more, preferably 0.6 mm or more, and more preferably 0.7 mm or more.

[0077] like Figure 4 As shown, in this embodiment, the support portion 7 has a first surface 7a that is recessed from the outer surface of the rod head (the outer surface other than the support portion 7 adjacent to the support portion 7) and extends towards the contour edge 6e of the opening 6. In this embodiment, the support portion 7 is recessed from the outer surface of the rod head in a stepped manner via a step. Figure 5 As shown, when the FRP member 1B is superimposed on such a support 7, it absorbs the thickness of the FRP member 1B, thereby reducing or eliminating the formation of a step on the outer surface of the rod head.

[0078] like Figure 3 and Figure 5 As shown, the support portion 7 has a support width Ws measured in a direction orthogonal to the contour edge 6e of the opening portion 6. In this embodiment, the rod head 1 has a high bonding strength between the support portion 7 and the FRP member 1B, thus enabling a reduction in this support width Ws and obtaining a greater weight margin. To sufficiently maintain the bonding strength and obtain a greater weight margin, the support width Ws is preferably 3 mm or more, more preferably 5 mm or more, more preferably 7 mm or more, and preferably 9 mm or less, more preferably 11 mm or less, and even more preferably 13 mm or less.

[0079] like Figure 5 As shown, when the first surface 7a is imaginarily divided into a first region A1 on the side of the contour edge 6e of the opening 6 and a second region A2 on the outer side of the first region A1 by dividing the support width Ws into two equal parts by the width centerline, it is preferable that the arrangement density of the grooves 9 in the second region A2 is less than that in the first region A1. A relatively larger bending moment acts on the second region A2 of the support 7 (i.e., the root side of the support 7). Therefore, by relatively reducing the arrangement density of the grooves 9 in the second region A2, the durability of the support 7 against bending deformation, etc., is improved. Consequently, the support 7 can be made thinner and lighter.

[0080] [Preferred Embodiment of FRP Components]

[0081] Examples of thermoplastic resins used for FRP components 1B include nylon (PA), polypropylene (PP), polyphenylene sulfide (PPS), polyethersulfone (PES), polyetherimide (PEI), polycarbonate (PC), polyether phthalate (PET), polyetherketone (PEK), polyetheretherketone (PEEK), polyetherketoneketone (PEKK), and phenoxy resins. Polyphenylene sulfide (PPS), polyetherimide (PEI), polyethersulfone (PES), polyetheretherketone (PEEK), and phenoxy resins with low degradation ratios are particularly suitable.

[0082] [Method for manufacturing the club head in this embodiment]

[0083] The club head 1 of this embodiment can be manufactured by including a first step of preparing the club head body 1A, a second step of preparing the FRP component 1B, and a third step of pressurizing / heating the overlapping parts of these components.

[0084] In the first process, for example, by irradiating the first surface 7a of the support 7 with a continuous wave laser moving in a predetermined pattern, fine grooves can be formed along the trajectory of the laser. The groove width w and groove depth d of the fine groove 9 can be appropriately adjusted by adjusting the moving speed and / or laser power during continuous wave laser irradiation. Furthermore, by allowing a portion of the first surface 7a, which is melted by the laser, to flow towards the inlet side of the fine groove 9 and solidify, a first fine groove 9a with a narrow inlet side can be formed. Through the above description, it is possible to prepare a surface 7a with one or more fine grooves 9 formed on it. Figure 3 Such a clubhead body 1A.

[0085] In the second process, for example, one or more sheets of prepreg cut into a specified shape are stacked. This yields... Figure 2 Such a plate-shaped FRP component 1B.

[0086] In the third process, such as Figure 8 As illustrated, the peripheral portion of the FRP component 1B is laminated onto the first surface 7a of the support portion 7. Then, the welding device 12 is pressed against the overlapping portion of the two components to apply heat and pressure. This causes the thermoplastic resin 10 of the FRP component 1B to plasticize and enter the interior of the grooves 9 of the first surface 7a. Then, by cooling the rod head body 1A and the FRP component 1B, the thermoplastic resin 10 that has entered the grooves 9 of the first surface 7a is cured therein. This manufactures the rod head 1 of this embodiment.

[0087] Furthermore, in the aforementioned third step, a welding apparatus 12 can be used, such as a resistance spot welder or an ultrasonic welding machine. Moreover, pressure can be applied using a mold or similar device, and heat energy can be applied separately using electromagnetic induction heating or the like.

[0088] exist Figure 8 In one embodiment, the first surface 7a of the support portion 7 faces the outer surface of the rod head; however, in other embodiments, the first surface 7a may also face the inner surface of the rod head on the side of the hollow portion i. Figure 9The third step of the rod head in this embodiment is shown in the diagram. In this third step, the FRP member 1B is lifted and pressed against the first surface 7a, for example, by the suction device 14. In this state, heat is applied from the second surface 7b side of the support portion 7 by the welding device 12. Furthermore, in this third step, the suction device 14 is used to press the FRP member 1B against the first surface 7a, but it is also possible to use the suction device 14 instead, or to use high-pressure air or the like in the hollow portion i to press the FRP member 1B against the first surface 7a of the support portion 7 together.

[0089] Figure 10 A bottom view showing a different embodiment of the rod head 1. Figure 10 This indicates that, in this embodiment, an opening 6 is formed in the base 4 of the clubhead body 1A, and an FRP member 1B is provided in the base 4 to seal this opening 6. Such a clubhead 1 results in a higher center of gravity and a greater tendency to move forward, while also achieving a lighter weight.

[0090] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific disclosures described above. Various modifications can be made to implement the invention within the scope of the technical concept described within the scope of the claims.

[0091] [Postscript]

[0092] The present invention includes the following forms.

[0093] [Invention 1]

[0094] A golf club head, comprising:

[0095] A metal clubhead body with an opening, and an FRP (fiberglass reinforced plastic) component fixedly connected to the clubhead body in a manner that seals the opening.

[0096] A support portion is provided around the opening of the rod head body, the support portion having a first surface that supports the FRP member.

[0097] At least one fine groove with a width of 20–80 μm and a depth of 100–400 μm is formed on the first surface.

[0098] The FRP component is a fiber-reinforced plastic comprising fibers and thermoplastic resin.

[0099] A portion of the thermoplastic resin is cured inside the groove.

[0100] [Invention 2]

[0101] As described in invention 1, in a golf club head, no adhesive is sandwiched between the FRP component and the first surface.

[0102] [Invention 3]

[0103] In the golf club head described in invention 1 or 2, the grooves are spaced in multiple intervals.

[0104] [Invention 4]

[0105] As described in the golf club head of this invention 3, the spacing is 0.04 to 0.5 mm.

[0106] [Invention 5]

[0107] A golf club head as described in any one of claims 1 to 4 of the present invention, wherein the groove extends along the contour edge of the opening.

[0108] [Invention 6]

[0109] A golf club head as described in any one of claims 1 to 5 of the present invention, wherein the support portion has a support width measured in a direction orthogonal to the contour edge of the opening portion.

[0110] When the first surface is imaginarily divided into a first region on the contour edge side of the opening and a second region outside the first region by the width centerline that bisects the support width,

[0111] The arrangement density of the fine grooves in the second region is less than that in the first region.

[0112] [Invention 7]

[0113] In the golf club head described in any one of claims 1 to 6 of the present invention, the thickness of the support portion is 0.5 to 1.2 mm.

[0114] [Invention 8]

[0115] A golf club head as described in any one of claims 1 to 7 of the present invention, wherein the first surface is recessed from the outer surface of the club head.

[0116] [Invention 9]

[0117] The golf club head described in any one of claims 1 to 8 of the present invention is a titanium alloy.

[0118] [Invention 10]

[0119] The golf club head described in any one of claims 1 to 9 of the present invention, wherein the thermoplastic resin of the FRP component includes polyphenylene sulfide, polyetherimide, polyethersulfone, polyetheretherketone, or phenoxy resin.

[0120] [Invention 11]

[0121] A golf club head as described in any one of claims 1 to 10 of the present invention, wherein the opening is formed at the top and / or bottom of the club head body.

[0122] Symbol Explanation

[0123] 1. Golf club head

[0124] 1A Club Head Body

[0125] 1B FRP component

[0126] 3-pole top

[0127] 4-pole bottom

[0128] 6. Opening

[0129] 6e Outline Edge

[0130] 7 Support section

[0131] 7a First Surface

[0132] 9 fine grooves

[0133] 10. Thermoplastic resins

[0134] A1 First Area

[0135] A2 Second Area

[0136] Ws is the support width.

Claims

1. A golf club head, characterized in that, include: A metal clubhead body with an opening and an FRP component fixedly connected to the clubhead body in a manner that seals the opening. A support portion is provided around the opening of the rod head body, the support portion having a first surface that supports the FRP member. At least one fine groove with a width of 20–80 μm and a depth of 100–400 μm is formed on the first surface. The FRP component is a fiber-reinforced plastic comprising fibers and thermoplastic resin. A portion of the thermoplastic resin is cured inside the narrow groove. The first surface, including the groove, is in direct contact with the FRP component.

2. The golf club head as described in claim 1, characterized in that, No adhesive is sandwiched between the FRP component and the first surface.

3. The golf club head as described in claim 1 or 2, characterized in that, The fine grooves are spaced in multiple intervals.

4. The golf club head as described in claim 3, characterized in that, The interval is 0.04 to 0.5 mm.

5. The golf club head as described in claim 1 or 2, characterized in that, The groove extends along the contour edge of the opening.

6. The golf club head as described in claim 1 or 2, characterized in that, The support portion has a support width measured in a direction orthogonal to the contour edge of the opening. When the first surface is imaginarily divided into a first region on the contour edge side of the opening and a second region outside the first region by the width centerline that bisects the support width, The arrangement density of the fine grooves in the second region is less than that in the first region.

7. The golf club head as described in claim 1 or 2, characterized in that, The thickness of the support portion is 0.5 to 1.2 mm.

8. The golf club head as described in claim 1 or 2, characterized in that, The first surface is recessed from the outer surface of the rod head.

9. The golf club head as described in claim 1 or 2, characterized in that, The main body of the rod head is made of titanium alloy.

10. The golf club head as claimed in claim 1 or 2, characterized in that, The thermoplastic resin of the FRP component includes polyphenylene sulfide, polyetherimide, polyethersulfone, polyetheretherketone, or phenoxy resin.

11. The golf club head as claimed in claim 1 or 2, characterized in that, The opening is formed at the top and / or bottom of the clubhead body.

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