WO2005028038A1

WO2005028038A1 - Golf club head and golf club

Info

Publication number: WO2005028038A1
Application number: PCT/JP2004/014309
Authority: WO
Inventors: Norihiko Nakahara
Original assignee: The Yokohama Rubber Co., Ltd.
Priority date: 2003-09-22
Filing date: 2004-09-22
Publication date: 2005-03-31
Also published as: JP2005095245A

Abstract

A golf club head, comprising a face part (22) having a face (23) for hitting a golf ball. In the golf club head, at least the hitting part of the face (23) for hitting the golf ball of the face (22) is formed of a laminated structural body having a laminated structure in which metal layers (30, 40) and fiber-reinforced plastic layers (42) are laminated on each other. In the laminated structural body, the thickness of the hitting part side metal layer (30) is set larger than the thickness of the metal layer (40) formed on the rear surface side of the hitting part. Where the mass of the laminated structural body is m (g) and the volume thereof is v (cc), the value of a parameter (B) expressed by B = m/v is set to 3.0 or higher.

Description

Description Golf club head and golf club TECHNICAL FIELD

The present invention relates to a golf club head and a golf club that maintain a hitting performance such as a flight distance, a degree, and the like, and improve a hit feeling mainly by hitting sound at the time of hitting. Background art

In recent years, various golf club heads have been proposed in which a laminated plate or a FRP plate in which a metal layer and a fiber reinforced plastic (hereinafter referred to as FRP) layer are laminated is used for the face portion.

Japanese Laid-Open Patent Publication No. 6-165582 discloses a face molded product composed of one or more composite layers in which a metal foil layer is laminated on at least a part or all of a face. A golf club head provided is disclosed.

This face molding is composed of one or more composite layers in which a measuring layer made of a shelf board or a fiber reinforced composite material is integrally bonded to at least one side of a metal foil layer via a resin film. Configured. In the golf club head described in the above publication, various metal foils having a thickness of 5 to 50 / m are used as the metal foil layer.

According to the above publication, by providing this face molding on the golf club head, the wear resistance is excellent, and the mechanical strength such as impact strength is also excellent. It is possible to obtain a golf club that is excellent in feel and aesthetics.

In addition, Japanese Patent Laid-Open No. 2000-103-028 78 discloses a hollow golf club head using a composite material in which a metal thin plate and a high-strength fiber are laminated on a face portion. ing.

According to this golf club head, even if the metal thin plate is thinned, the golf club head is not plastically deformed because the metal thin plate is reinforced by the high elastic fiber. For this reason, even a golfer with a high head speed can be used sufficiently. In addition, if the composite metal thin plate that makes up the face part is made very thin and easily bent, the golf pole hit by a golfer with a slow head speed will have a higher initial speed and a higher pack spin rate. The launch angle also increases. This increases the flight distance.

In the golf club head disclosed in this publication, a titanium alloy plate having a thickness of 0.1 to 1.0 mm is used as the metal thin plate.

However, in all the golf club heads disclosed in the above-mentioned publications, although the hitting performance related to the distance and the durability and the touch transmitted to the hand are improved, the hitting sound at the time of hitting is improved. It is not a thing. Disclosure of the invention

An object of the present invention is to eliminate a problem based on the conventional technique, and maintain a hitting performance such as a flight distance and a strength, etc., and a golf club head and a golf club excellent in hitting feeling by hitting sound at the time of hitting Is to provide.

In order to achieve the above object, the first aspect of the present invention hits a golf pole. A golf club head having a face portion having a face surface, wherein at least a hit portion of the face surface that hits the golf pole is a laminate of a metal layer and a fiber reinforced plastic layer. The laminated structure has a structure in which the thickness of the metal layer on the hitting part side is thicker than the thickness of the metal layer provided on the back side of the hitting part, A golf club head characterized by the fact that the parameter B represented by B = m / v is 3.0 or more, where m is (g) and its own volume is V (cc). Is to provide. In the present invention, it is preferable that the laminated structure constituting the face portion has a total of at least three layers of the metal layer and the fiber reinforced plastic layer.

In the present invention, it is preferable that a surface portion of the face portion that directly contacts the golf ball of the hitting portion is formed of a metal layer.

Furthermore, in this invention, it is preferable that the metal layer in the said laminated structure is reducing in thickness gradually as it goes to the back surface from the said surface part.

Furthermore, in the present invention, it is preferable that the back surface of the laminated structure is constituted by a fiber reinforced plastic layer.

In the present invention, the laminated structure of the face part is preferably provided in a region having a radius of 15 mm from the center position of the face surface, and the specific gravity is preferably 1.8 to 8.5.

In the present invention, the laminated structure of the face portion is provided in a region having a radius of 15 mm from the center position of the face surface, and preferably has a thickness of 2.0 to 5.0 mm. . In the present invention, the laminated structure of the face part is preferably provided in a region having a radius of 15 mm from the center position of the face surface, and its Young's modulus is preferably 40 to 25 GPa.

In the present invention, the laminated structure of the face portion is provided in a region having a radius of 15 mm from the center position of the face surface, and the mass ratio of all the metal layers of the laminated structure is 40 to It is preferably 8 5%.

According to a second aspect of the present invention, there is provided a golf club having the golf club head of the present invention. Brief Description of Drawings

FIG. 1 is a graph showing the frequency distribution of the hitting sound of a golf club head in which the vertical axis represents sound pressure and the horizontal axis represents frequency, and the face part material is metal. FIG. 2 is a graph showing the frequency distribution of the hitting sound of a golf club head whose face part is FRP, with the sound pressure on the vertical axis and the frequency on the horizontal axis. Fig. 3 shows the frequency distribution of the sound of hitting golf club heads with the sound pressure on the vertical axis and the frequency on the horizontal axis, and the face is composed of a layered structure of metal and FRP layers. It is a dull that shows.

FIG. 4 is a plan view showing the golf club according to the first embodiment of the present invention, FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, and FIG. It is the elements on larger scale of the face part shown in a figure.

FIG. 7 is a cross-sectional view of a golf club head according to a second embodiment of the present invention, and FIG. 8 is a cross-sectional view of the golf club head of Comparative Example 1. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a golf club head and a golf club of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

Conventionally, the material of the face surface of a golf club head has been metal or FRP. When a golfer hits a golf pole using a golf club head made of only a metal face material, a metallic sound is generated, and the golfer feels that the golfer feels a hitting feeling. This is because the impact sound does not attenuate and the sound pressure peak is too high. In addition, when a golf club hits a golf pole using a golf club head having a face part made of only F R P, the effect of the resin is great, and the golfer feels that the hit feeling is soft. This is because the impact sound is attenuated too much and the sound pressure peak is too low.

Here, the present inventor found that improving the hitting sound is the most effective way to improve the hit feeling because the hitting sound is the largest factor that controls the hit feeling.

Therefore, the inventor of the present invention thought that the hitting sound of the golf club head was improved by configuring the face portion with a laminated structure of the metal layer and the FRP layer. However, when the golf club head has a hollow structure, the hitting sound vibrates even if the face portion is made of metal, or even a laminated structure of a metal layer and an FRP layer. It is difficult to attenuate, and as shown in Fig. 1, the sound pressure peaks Pl and P2 become high. For this reason, the golfer may feel that the hit feeling of the golf club head of the hollow structure is hard, and the golfer always feels preferable. Cannot get a hit feeling.

Here, FIG. 1 is a graph showing the frequency distribution of the hitting sound of a golf club head in which the sound pressure is plotted on the vertical axis and the frequency is plotted on the horizontal axis, and the face portion is made of metal. FIG. 1 shows that the parameter B obtained by dividing the mass m (g) of the golf club head by the volume V (cc) of the golf club head is less than 3.0, as will be described later. It is the result obtained about the golf club head.

Furthermore, as a result of intensive studies by the inventor, the parameter B (= / v) obtained by dividing the mass m (g) of the golf club head by the volume V (cc) of the golf club head is 3. It has been found that in golf club heads of 0 or more, the best hitting sound can be obtained for a golfer when the face portion is constituted by a laminated structure of a metal layer and an FRP layer.

Here, FIG. 2 is a graph showing the frequency distribution of the hitting sound of a golf club head in which the sound pressure is plotted on the vertical axis and the frequency is plotted on the horizontal axis, and the material of the face portion is FRP. FIG. 2 shows the results obtained for a golf club head having a parameter B value of 3.0 or more.

As shown in Fig. 2, even if the value of parameter B is 3.0 or more, when a golfer uses a golf club head having a face portion made of FRP, a clear sound pressure peak Is not seen, and the feel is soft.

Fig. 3 shows the frequency distribution of the sound of hitting a golf club head, in which the sound pressure is plotted on the vertical axis and the frequency is plotted on the horizontal axis, and the face part is composed of a laminated structure of metal and FRP layers. It is a graph to show. Figure 3 shows the results obtained for golf club heads with a parameter value B of 3.0 or more. On the other hand, as shown in FIG. 3, when a golfer uses a golf club head in which the value of parameter B is 3.0 or more and the face part is a laminated structure of a metal layer and an FRP layer. Sound pressure peaks P 1 and P 2 appear at lower levels than those shown in Fig. 1. However, the sound pressure peaks P1 and P2 were low, and when the golfer heard the sound, the sound that he thought was just right was obtained.

Further, the present inventor has further improved the sound of hitting golf players by adjusting the laminated structure, the number of laminated layers, and the laminated thickness of the metal layer and the FRP layer in the laminated structure used for the face portion. It was found that can be obtained.

FIG. 4 is a plan view showing the golf club according to the first embodiment of the present invention. As shown in FIG. 4, the golf club head 10 has a collet club head 20 and a golf club shaft 50. The golf club shaft 50 is attached to the golf club head 20 through a socket 52.

The golf club head 20 has a face portion 22, a sole portion 24, an upper portion 26 and a hosel portion 28, and is a type of head generally called an iron.

In the golf club head 20 of this embodiment, the face portion 22 has a laminated structure as will be described later, and the sole portion 24 and the upper portion 26 are made of a metal material. These face part 2 2, saw part 2 4 and upper part 2 6 are joined together to form a non-hollow structure.

The face portion 22 is a face surface 23 on which the surface hits the golf pole. Of this face surface 23, a laminated structure of a metal layer and an FRP layer is disposed at least on the surface of the striking portion that is in direct contact with the golf pole. This laminated structure will be described in detail later. On the face surface 2 3, for example, three score lines extending in the toe direction from the heel are formed in parallel.

FIG. 5 is a cross-sectional view taken along line AA in FIG. 4, and FIG. 6 is a partially enlarged view of the face portion shown in FIG. Reference numeral 32 shown in FIG. 5 is a composite structure that collectively shows a laminate of a metal layer and an FRP layer.

In the present embodiment, as shown in FIG. 6, the face portion 22 is composed of a laminated structure in which metal layers 30 and 40 and an FRP layer 42 are laminated. In the present embodiment, for example, the laminated structure has three metal layers 30 and 40,? Layer 42 consists of 3 layers, a total of 6 layers. The face surface 23 (surface portion) on which the golf pole is hit is composed of a metal layer 30. Further, the back surface 25 is composed of the FRP layer 4 2. The above score line L (see FIG. 4) is formed only on the metal layer 30.

The laminated structure constituting the face portion 22 has a thickness T s force of the metal layer 30 on the striking portion side and is thicker than the thickness Tm of the metal layer 40 on the side opposite to the striking portion. In this laminated structure, the thickness of the metal layer is made thicker on the face surface 23 side and made thinner on the back surface 25 side.

The laminated structure preferably has a laminated structure in which at least three layers of metal layers 30 and 40 and FRP layer 42 are laminated in total. In addition, the surface portion of the hitting portion of the face surface 23 that is in direct contact with the golf pole is preferably composed of the metal layer 30.

Further, the upper limit of the number of layers of the metal layer and the FRP layer is preferably 14 layers in view of cost and complexity of the manufacturing process. In the present embodiment, the mass of the golf club head 20 is m (g). Further, the volume of the golf club head 20 up to the end portion 28 a of the hosel portion 28 of the golf club head 20 shown in FIG. 4 is V (cc). At this time, the value of parameter overnight B represented by B == m / v is set to 3.0 or more.

The value of this parameter B indicates the hollowness of the golf club head 20.

The mass of the golf club head 20 is measured by a known measuring method such as an electronic balance. In addition, the volume of the golf club head 20 is measured by a known measuring method such as, for example, the Archimedes method. In the present invention, the gap portion (where the golf club shaft of the hosel portion is inserted) (Not shown) is included in the volume of the golf club head 20.

In the golf club head 20 of the present embodiment, the value of the parameter B is set to 3.0 or more, the face portion is a laminated structure of a metal layer and an FRP layer, and the thickness of the metal layer is set to the striking portion side. Make it relatively thick. By adopting such a configuration, it is possible to obtain a golf club head having excellent hitting feeling by hitting sound at the time of hitting while maintaining hitting performance such as flight distance and three fish degrees.

Further, in the laminated structure constituting the face portion 22 in the present embodiment, the metal layers 40 other than the metal layer 30 do not necessarily have the same thickness, and are directed from the face surface 23 to the back surface 25. Accordingly, the thickness of the metal layer 40 may be decreased stepwise. Similarly, it is not necessary that all the FRP layers 42 have the same thickness, and the thickness of the FRP layer 42 is gradually increased from the face surface 23 to the back surface 25. Also good. Furthermore, the metal layer 40 is moved from the face surface 23 to the back surface 25. Accordingly, the thickness of the FRP layer 42 may be decreased stepwise, and the thickness of the FRP layer 42 may be increased stepwise from the face surface 23 toward the back surface 25.

In the face portion 23, the back surface 25 is preferably composed of the FRP layer 42. As a result, the tensile strength of the FRP layer 42 is increased, so that the face portion 23 can secure sufficient strength against the tensile deformation of the back surface 25 of the face portion 22 caused by the hitting of the golf pole.

Further, the material of the metal layer and the FRP layer of the laminated structure constituting the face portion 22 of the present embodiment is not particularly limited.

Examples of metal layers include stainless steel, maraging steel, iron, aluminum, titanium, titanium alloys, copper, brass, nickel, nichrome, tin, lead, magnesium, gold, silver, platinum, and various other metals and alloys. Is composed of

For example, NSSHT1770 (trade name (composition: Fe—0.04C-1.5Si—0.3Mn—0.03P—0.004S-7.2Ni) manufactured by Nisshin Steel Co., Ltd. -14. 7 C r-0. 7 Cu-0. 4T i-0. 009 N)).

Examples of the maraging steel described above include YAG250 (trade name (composition: Fe—18N i—8 Co—5Mo—0.4T i—0.1 A 1)), YAG300 (trade name) manufactured by Hitachi Metals, Ltd. (Composition: Fe-18 N i— 9 C◦— 5Mo— 0.9 Ti—0.1 A1)), and YAG 350 (trade name (Composition: Fe-18 N i -12Co-4Mo-l. 7T i— 0.1 A1)) is exemplified.

Furthermore, as the above-mentioned titanium alloy, Kobe Steel, TVC (trade name (group ： T i— 13V— ll C r— 3A 1)), and J FE Holding (former Nippon Steel Pipe Co., Ltd.), SP 700 -2 F e)).

The metal layer of the present embodiment preferably has a tensile strength of 30 OMPa or more and a specific gravity of 1.8 or more.

In addition, the FRP layer of this embodiment is obtained by reinforcing a matrix resin with reinforcing fibers. Examples of the reinforcing fibers include inorganic fibers such as carbon fibers, boron fibers, glass fibers, alumina fibers, silicon carbide fibers, and silicon nitride fibers, aramid fibers, polyarylate fibers, polyethylene fibers, and polyester fibers. Examples are machine fibers, or metal fibers such as titanium fibers, amorphous fibers, and stainless steel fibers. Further, as the reinforcing fiber, a plurality of types may be selected from those exemplified above and used as the reinforcing fiber. Further, the orientation of the reinforcing fibers is not particularly limited, and they may be arranged in one direction or used in a cross (woven fabric) state. Further, even if one or more (layers) of these reinforcing fibers or cloths are provided in an overlapping manner, in the present invention, it is defined as one FRP layer.

Further, as the reinforcing fiber of the FRP layer, for example, it is preferable that the tensile strength of the single fiber in the 0 degree direction is 250 OMPa or more and the specific gravity is 2.6 or less.

Examples of the matrix resin include thermosetting matrix resins such as epoxy resins, unsaturated polyester resins, polyurethane resins, diallyl phthalate resins, and phenol resins.

The matrix resin is preferably an epoxy shelf. This matrix tree Examples of fats include glycidyl ether epoxy resins (bisphenol A, F, S epoxy resins, nopolac epoxy resins, brominated bisphenol A epoxy resins), cyclic aliphatic epoxy resins, and glycidyl ester resins. Examples include epoxy resins, glycidylamine epoxy resins such as tetradaricidyldiaminodiphenylmethane or tridaricidyl ^ /-p-aminophenol, and heterocyclic epoxy resins. Furthermore, as the matrix resin, one or more selected from these various other epoxy resins can be used. As the matrix resin in the present embodiment, bisphenol A, F, S glycidylamine type epoxy resins are particularly suitable.

Hardeners include amine curing agents such as dicyandiamide (DICY), diaminodiphenylsulfone (DDS), diaminodiphenylmethane (DM); acid anhydrides such as hexahydrophthalyl anhydride (HHPA). ), Methylhexahydrophthalic anhydride (MHHP A) and the like. Especially as a hardening | curing agent, an amine-type hardening | curing agent can be used conveniently.

A pre-preda can also be used for the F RP layer. For example, P 3 2 5 1 S—1 5 (trade name) made by Toray Industries Co., Ltd. or F 6 3 4 3 B-0 5 P (trade name) cloth made by Toray Industries, Inc. A pre-preda is exemplified.

Further, in the laminated structure constituting the face portion 22 in the golf club head 10 of the present embodiment, a resin film may be provided at the boundary between the metal layer and the FRP layer, or an adhesive may be applied. In this case, the thickness of the adhesive layer of the adhesive is preferably 0.02 to 0.2 mm. Examples of the resin film include polyurethane resin, nylon resin, modified nylon resin, polyethylene terephthalate resin, polyvinyl chloride resin, polycarbonate resin, polyvinylidene chloride, ethyl Examples thereof include a thermoplastic resin film such as a cellulose resin and a cellulose oxalate resin.

In addition, it is preferable to use this resin film having high compatibility with the matrix resin of the pre-preda. For example, when an epoxy resin or the like is used for the matrix resin, a polyurethane resin, a modified nylon resin film or the like is preferable as the resin film. The thickness of the resin film is preferably 0.02 to 0.2 mm.

Further, the laminated structure used in the face portion of this embodiment does not necessarily need to use the same metal layer and FRP layer, and may be made of different metals or different FRP layers. In this case, the dissimilar metal is a different type of metal in the case of a single metal, and in the case of an alloy, the smaller value of the composition ratios of elements common to the alloy to be compared is extracted and summed. When the value is less than 30%. For example, 6-4 titanium alloy (Ti: A1: V = 90: 6: 4) and 15-5-3 titanium alloy (Ti: Mo: Zr: Al = 77: 15: 5: When comparing 3), the above total value is 80% (= 77 + 3), so the 6-4 titanium alloy and the 15-5-3 titanium alloy are not dissimilar metals.

Heterogeneous FRP means that the modulus of elasticity differs by 10% or more when compared.

In the golf club head of the present invention, the laminated structure is provided in a region having a radius of 15 mm from the center position of the face surface 23 of the face portion 22. This product The specific gravity of the layered structure is preferably 1.8 to 8.5 in order to sufficiently maintain the hitting performance such as the flight distance and the strength.

Further, in the golf club head of the present invention, the laminated structure is provided in a region having a radius of 15 mm from the center position of the face surface 23 of the face portion 22. The thickness T (see Fig. 6) of the face portion 22 (laminated structure) is 2.0 to 5. O mm in order to sufficiently maintain the hitting performance such as the flight distance and the strength. I prefer that.

Furthermore, in the golf club head of the present invention, the laminated structure is provided in a region having a radius of 15 mm from the center position of the face surface 23 of the face portion 22. The Young's modulus of this laminated structure is preferably 40 to 2500 GPa in order to sufficiently maintain impact performance such as flight distance and strength.

Furthermore, in the golf club head of the present invention, the laminated structure is provided in a region having a radius of 15 mm from the center position of the face surface 23 of the face portion 22. In order to further improve the hitting sound, the mass ratio of all the metal layers of the laminated structure is preferably 40 to 85%.

Here, in the present embodiment, the center of the face surface 23 of the face portion 2 2 is measured by the method disclosed in Japanese Patent Application Laid-Open No. 2 0 0 1-2 4 6 0 2 3. . Hereinafter, a method for measuring the center of the face surface 23 of the face portion 22 will be described.

The method of measuring the center of the face surface 23 of the face portion 22 is determined by a center measuring device having a support portion for supporting a center measurement object (golf club head) at the top. The central measuring instrument is used for measuring objects whose supporting parts support the measuring object in equilibrium. You can know the position. In other words, the center measuring method is to find an equilibrium position where the golf club head is placed on the support and does not fall even if the hand is released.

The support part is preferably a plane or a form that supports at three or more points. Further, the area of the support part is preferably 15 mm ² or less. Further, the lower limit of the area of the support portion is not particularly limited as long as the golf club head is supported. The area of the support part is indicated by the area of the plane part if it is a plane, or by the area of the figure connecting the points if it is supported by three or more points. Thus, by setting the area of the support portion within the above range, the center can be obtained more accurately.

In the present embodiment, the center position thus determined by measurement is referred to as the center position of the golf club head.

In the present embodiment, as described above, the face portion preferably has at least three layers, and the upper limit is preferably 14 layers. By using such a stacked structure, defects in the stacked structure can be reduced. For this reason, the delamination strength of the laminated structure can be improved, and the strength of the face portion can be improved. In addition, it is preferable that the portion directly in contact with the golf pole is also a metal layer, so that the wear resistance can be increased. For these reasons, the golf club head of the present embodiment has high strength and high durability, low elasticity and high resilience, and low specific gravity and light weight. As a result, the degree of freedom in design is increased and the flight distance can be improved.

Next, a second embodiment of the present invention will be described.

FIG. 7 is a cross-sectional view of a golf club head according to the second embodiment of the present invention. In the present embodiment, the same components as those of the golf club head of the first embodiment shown in FIGS. 4 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 7, the golf club head 21 of the present embodiment has a back surface of the laminated structure constituting the face portion 22 as compared with the golf club head 20 of the first embodiment. 25 is composed of a metal layer 34, and the rest of the configuration is the same as that of the golf club head 20 of the first embodiment, and a detailed description thereof will be omitted.

As described above, it is effective to configure the back surface 25 of the face portion 22 with the FRP layer, but even if the metal layer 34 is disposed, the same effect as in the first embodiment can be obtained. Further, in the golf club head 21 of the present embodiment, the numerical value limitation of the components common to the golf club head 20 of the first embodiment is the same, and thus detailed description thereof is omitted.

In any of the embodiments, the saw portion 24 may be formed of a stacked structure of a metal layer and a FRP layer. Thus, by forming the sole portion 24 with a laminated structure, it is possible to improve the hit feeling mainly due to the hitting sound.

Further, it goes without saying that the same effects as those of the above-described embodiment can be obtained for the golf club using the golf club head of any of the above-described embodiments. The present invention is basically as described above. As described above, the golf club head and the golf club of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiment, and various modifications or changes may be made without departing from the spirit of the present invention. Of course it is good. Hereinafter, examples of the golf club head of the present invention will be specifically described in comparison with comparative examples that are out of the scope of the present invention.

In this example, for Examples 1 to 12 and Comparative Examples 1 to 5 shown in Table 1 below, evaluation was performed using hit feeling, strength, resilience, design freedom, and flight distance as evaluation items. went. The evaluation results for each item are shown in Table 2 below. Each evaluation item shown in Table 2 below was evaluated with relative values, with Comparative Example 1 as the standard (100). Here, FIG. 8 is a cross-sectional view of the golf club head of Comparative Example 1.

As shown in FIG. 8, in the golf club head 100 of Comparative Example 1, the face part 22, the sole part 24, and the upper part 26 are all made of stainless steel (SUS steel). The thickness c of the face part 22 is 2.8 mm.

In this example, golf club shafts for TRX-DUO M40 (trade name) manufactured by Yokohama Rubber Co., Ltd. were attached to each golf club head to produce a golf club, and the following tests were conducted. This golf club is 45 inches long.

In this example, the mass of the golf club head was measured using an electronic balance (measuring resolution = 0.1 g). The volume of the golf club head was measured by the Archimedes method by closing the opening of the hosel.

The composition of “Ti alloy” shown in the “Material” column of “Face surface” shown in Table 1 below is Ti 15Mo-5Z r-3A1. Further, the composition of “Ti alloy” shown in Table 1 below is Ti 15V-3Cr-3A1-3Sn. In addition, NSSHT1770M (trade name (manufactured by Nisshin Steel)) was used as the “SUS steel” shown in Table 1 below. “FRP” shown in Table 1 below has a fiber Young's modulus of 24 tons, fiber basis weight s, 60 g / m ² , and resin content of 38%.

In addition, the “¾fat film” shown in Table 1 below has a polyurethane fat-based thickness.

A 0.08 mm one was used.

The hit feeling shown in Table 2 below was evaluated by giving a total of 100 people who are amateur golfers and professional golfers with head speeds ranging from 34 m / sec to 50 mZ sec. As an evaluation method, each person was given the feeling of hitting the examples and other comparative examples as “metal sound too much” (3-5), “just right” (1-2-2), and “no metal sound”. (1 3 ^ ^ — 5) was given a score, the average value was obtained, and the hit feeling of each example and each comparative example was evaluated with a numerical value of -5 to 5. It should be noted that the numerical value is in the range of 2 to 2 power $ hit feeling.

For the strengths shown in Table 2 below, using an air cannon tester, the golf pole was made to collide with the center of the face portion of each golf club head of the example and the comparative example at a speed of 5 OmZ seconds. The number of hit balls until breaking was measured. In this case, the number of hit balls until the break in Comparative Example 1 was taken as 100, and the hit feeling of each Example and each Comparative Example was expressed by numerical values.

Regarding the repulsion shown in Table 2 below, “Procedure for Measuring the Velocity Ratio of a Club Head for Conformance to Rule 4-le, Appendix II Revision 2 Evaluation was made using the coefficient of restitution of the examples and comparative examples measured based on February 8, 1999 ”. In this case, the restitution coefficient of Comparative Example 1 was set to 100, and the repulsion of each Example and each Comparative Example was represented by a numerical value. Regarding the degree of freedom of design shown in Table 2 below, the specific gravity of the face portion of Comparative Example 1 is assumed to be 100, and the specific gravity of the face portion of each Example and each Comparative Example is converted and expressed as a numerical value. is there.

Regarding the flight distance shown in Table 2 below, for the golf clubs of each of the examples and comparative examples, a total of 10 0 amateur golfers and professional golfers with head speeds ranging from 34 mZ seconds to 5 O mZ seconds. It is the average value obtained by hitting each person 10 balls.

Further, “Face specific gravity” and “Face Young's modulus” shown in Table 1 below are values of the face portion in a region having a radius of 15 mm centered on the center position of the face surface. As described above, the center position of the face surface was obtained by a center measuring device having a support portion for supporting the golf club head at the upper portion.

Hollowness Face surface Other than face surface

ί precious layer Face resin face P

Parameter B. Ding Back Face Face Thickness Thickness Number of Layers Film Young's Modulus

(K * (g) Material Material Number of layers Material Specific gravity Thickness (mm)

Use (mm, mm) (GPa)

/ Volume (cc)) (layer)

(Layer) Mass ratio Example 1 4.2 SUS steel 0J SUS steel 0.13 4 10 Yes FRP 4.2 2.9 95 78:22 Example 2 4.2 SUS steel 0.5 SUS steel 0.13 4 10 Yes FRP 3.9 2.7 90 75:25 Example 3 4.2 SUS Steel 0.8 Stainless steel 0.13 3 8 Yes FRP 4.2 2.9 97 77:23

0.2: 1 layer,

Example 4 4.2 Stainless steel 0.7 Stainless steel Total 4 10 Yes FRP 4.3 3.0 95 79:21

0.13: 3 layers

Example 5 4.2 τ Metallurgy 1.2 Τί Alloy 0.13 2 6 Yes FRP 3.2 3.2 95 73:27 Example 6 4.2 Ti Alloy 1.0 τ Metallurgy 0.13 2 6 Yes FRP 3.0 3.0 90 70:30 Example 7 4.2 Ti Alloy 1.8 Ti Alloy 0.13 2 6 Yes FRP 3.5 3.8 97 79:21 Example 8 4.2 τ Metallurgy 1.2 τ Metallurgy 0.2, 0.1 Total 2 6 Yes FRP 3.2 3.2 95 73:27 Example 9 4.2 SUS Steel 0J SUS Steel 0.13 4 10 Yes SUS Steel 4.2 2.9 95 78:22 Example 10 4.2 SUS steel 0.7 SUS steel 0.13 4 10, FRP 4.5 2.6 95 81:19 Example 11 4.2 SUS steel 07-1-2 Yes FRP 3.4 2.4 90 67:33 Example 12 4.2 FRP 0.7 Stainless steel 0.13 4 10 Yes FRP 21 2.9 95 51:49 Comparative example 1 5.0 Stainless steel 2.8----One Stainless steel 7.8 2.8 210 100: 0 Comparative example 2 5.0 FRP 6.2 One-one-One FRP 1.6 6.2 350 0: 100 Comparative Example 3 2.5 SUS Steel 2.8--One--SUS Steel 7.8 2.8 210 100: 0 Comparative Example 4 2.0 FRP 6.2 One-One-One FRP 1.6 6.2 350 0: 100 Comparative Example 5 2.1 SUS Steel 0.7 SUS Steel 0.13 4 10 Yes FRP 4.2 2.9 95 78:22

Table 2

As shown in Table 2 above, all of Examples 1 to 12 were able to obtain good results with respect to feel, strength, resilience, design freedom, and flight distance.

On the other hand, in Comparative Example 1, the face part is composed only of SUS steel, and is not a laminated structure. Therefore, the metal sound is excessive and the feel is inferior, and the degree of freedom in design and the flight distance are also inferior. It was.

Further, in Comparative Example 2, the face part is composed of only F R P and not a laminated structure, so that the metal sound was too much, the hit feeling was inferior, and the design freedom and the flight distance were also inferior.

Furthermore, in Comparative Example 3, the face part is composed of only SUS steel and has a laminated structure. Furthermore, since the value of the parameter parameter B was less than the lower limit of the present invention, the metal sound was too low and the feel was inferior, and the degree of freedom in design and flight distance were also inferior. In Comparative Example 4, the face portion is composed of only FRP, not a laminated structure, and the value of parameter B is less than the lower limit of the present invention. The design freedom and flight distance were also poor. In Comparative Example 5, the value of the parameter B was less than the lower limit of the present invention, so that the hit feeling was inferior. Industrial applicability

As described above in detail, the golf club head and golf club of the present invention have a laminated structure in which a hitting portion of a face surface for hitting a golf pole is laminated with a metal layer and a fiber reinforced plastic layer. In addition to the structure, the thickness of the metal layer on the striking part side is increased, and the value of parameter B expressed by (own mass m (g)) / (own volume v (cc)) is set to 3 0 or more. By adopting such a configuration, it is possible to improve the hit feeling mainly due to hitting sound at the time of hitting while maintaining hitting performance and degree such as flight distance.

Claims

The scope of the claims

1. A golf club head having a face portion having a face surface for hitting a golf pole,

Of the face portion, at least the hitting portion of the face surface that hits the golf pole is composed of a laminated structure having a laminated structure in which a metal layer and a fiber-reinforced plastic layer are laminated,

In the laminated structure, the thickness of the metal layer on the striking portion side is thicker than the thickness of the metal layer provided on the back surface side of the striking portion,

A golf club heap characterized by the fact that the parameter B represented by B = mZv is 3.0 or more, where m is the mass of the mass and v is the volume of the mass. De.

2. The golf club head according to claim 1, wherein the laminated structure constituting the face portion has a total of at least three layers of the metal layer and the fiber reinforced plastic layer.

3. The golf club head according to claim 1, wherein a surface portion of the face portion that directly contacts the golf pole of the hitting portion is formed of a metal layer.

4. The golf club head according to claim 1, wherein the thickness of the metal layer in the laminated structure decreases stepwise from the front surface portion toward the back surface.

5. The golf club head according to claim 1, wherein the back surface of the laminated structure is composed of a fiber strong plastic layer.

6. The laminated structure of the face portion has a radius of 15 m from the center position of the face surface. The golf club head according to claim 1, wherein the golf club head is provided in an area of m and has a specific gravity of 1.8 to 8.5.

7. The laminated structure of the face portion is provided in a region having a radius of 15 mm from a center position of the face surface, and has a thickness of 2.0 to 5.0 mm. The golf club head described in 1. '

8. The golf according to claim 1, wherein the laminated structure of the face portion is provided in a region having a radius of 15 mm from a center position of the face surface, and has a Young's modulus of 40 to 25 OGPa. Club head.

9. The laminated structure of the face portion is provided in a region having a radius of 15 mm from the center position of the face surface, and the mass ratio of all the metal layers of the laminated structure is 40 to 8.

The golf club head according to claim 1, wherein the golf club head is 5%.

10. A golf club comprising the golf club head according to any one of claims 1 to 9.