JP2005137634A - Golf club head and golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head in which high-pitched ball-hitting sound is attenuated easily, and to provide a golf club provided with the head. <P>SOLUTION: In an iron golf club head 1, the thickness (t1) of a ball-hitting part 40 at a face part 4 is 1.5-3.0 mm. On the rear surface of the ball-hitting part 40, a resin badge 3 where the maximum value of the thickness (t) is 2.6-10 mm is attached. On the rear surface of the ball-hitting part 40, a seating 4A is formed, and the resin badge 3 having a shape matched to the shape of the seating 4A is mounted. This constitution can be applied to a wood head. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a golf club head and a golf club.

  In golf club heads, it has been conventionally practiced to reduce the thickness of the face portion having a hitting ball portion (for example, about 3.0 mm or less).

  By making the face portion thin, the face portion is easily bent at the time of hitting. As a result, the coefficient of restitution is improved and the flight distance is increased.

Conventionally, for example, a resin plate is mounted on the back surface of the face portion of an iron golf club head.
Japanese Patent Laid-Open No. 9-276455 Japanese Patent No. 2,661,796

  However, the golf club head as described above has the following problems.

  When the face portion is made thin, generally, the hitting sound tends to be loud and difficult to attenuate. This may adversely affect the hit feeling of the golfer. On the other hand, it is conceivable to provide attenuation means on the face portion. However, the resin plate provided on the back surface of the face portion of the conventional iron golf club head is thin and cannot sufficiently function as a damping means.

  By the way, in Japanese Patent Laid-Open No. 9-276455, a sole is formed from the lower end of the face surface that hits the ball to the back surface side, and is surrounded by ribs provided around the back surface at the center portion. An iron golf club head is disclosed in which a depression is formed and a magnesium-based alloy plate-like body is provided at the bottom of the depression on the back side of the face surface.

  However, magnesium has high rigidity, so that the plate cannot follow the deflection of the face portion at the time of hitting, regardless of the thickness of the plate, and is easily peeled off by repeated hitting.

  Also, in Japanese Patent No. 266196, a strike face located on the front surface, a sole extending from the bottom of the face to the rear side, a back surface located on the opposite side of the face, and at least the back surface are installed. Vibration damping means comprising a hard plate coupled to the back surface via an elastic plate, the hard plate having a Young's modulus greater than 10000 MPa and a thickness of 0.5 mm to 2.0 mm, As a means, a golf club head is disclosed in which a peripheral portion thereof is provided in an unconstrained state.

  However, this vibration damping means performs vibration damping by the cooperation of a viscoelastic plate and a hard plate, and is different in premise and configuration from the present invention in which the hitting sound is attenuated by the resin plate.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a golf club head in which a hitting sound is easily attenuated and a golf club including the head.

  The golf club head according to the present invention is a golf club head having a hitting part thickness of 1.5 mm or more and 3.0 mm or less at the face part, and a maximum thickness of 2.6 mm or more and 10 mm or less on the back surface of the hitting part. At least one resin plate is attached.

  Thereby, it is possible to easily attenuate the hitting sound that adversely affects the hit feeling.

  Here, the hitting ball portion is a part of the face portion, and means a sweet spot and its surrounding area. In other words, the hitting ball portion is an area where it is scheduled to hit the face portion.

  It is preferable to form a pedestal on the back surface of the hit ball portion in accordance with the shape of the resin plate.

  Thereby, said resin plate can be easily attached to a predetermined position.

  Moreover, it is preferable to provide a groove in the resin plate.

  By providing the groove portion, the resin plate can easily follow the deflection of the face portion at the time of hitting. As a result, peeling of the resin plate due to repeated hitting can be suppressed.

  The groove is preferably formed so as to extend in a direction perpendicular to the longitudinal direction of the resin plate.

  By forming the groove in the above direction, the rigidity of the cross section in the longitudinal direction of the resin plate can be reduced, so that the force for peeling the resin plate from the face portion at the longitudinal end of the resin plate is reduced. be able to.

  The area of the resin plate is preferably 25% or more and 100% or less of the area of the back face part.

  Here, the area of the resin plate means a bonding area where the resin plate is fixed to the back surface of the face portion.

  Thereby, it is possible to obtain the above-described attenuation effect of the hitting sound more sufficiently.

  A golf club according to the present invention includes the above-described golf club head.

  As described above, in the golf club head according to the present invention, the hitting sound is easily attenuated. Therefore, by providing the golf club head, it is possible to obtain a golf club with excellent hit feeling.

  According to the present invention, the hitting sound can be easily attenuated in the golf club head.

  Embodiments of a golf club head and a golf club according to the present invention will be described below.

  In the golf club head according to the present embodiment, the thickness of the hit ball portion in the face portion is about 1.5 mm or more and 3.0 mm or less (more preferably, about 1.8 mm or more and 2.7 mm or less, more preferably 2.0 mm). The maximum thickness of the golf club head is about 2.6 mm or more and 10 mm or less (more preferably about 2.8 mm or more and 5.0 mm or less, more preferably about the back surface of the hit ball portion. Is attached with a resin badge (resin plate) of 3.0 mm or more and 4.0 mm or less.

  In order to increase the deflection of the face part at the time of hitting and increase the resilience characteristics, the face part should be thin, and in order to ensure the durability against repeated load at the time of hitting, the face part should be thick. . By setting the thickness of the face portion within the above range, both of these requirements can be satisfied. The thickness of the face portion is changed within the above range according to the material used for the face portion.

  The above golf club head is typically an iron golf club head, but may be a wood head. The iron golf club head typically has a cavity on the back surface side of the face portion, but may be other than this.

  By the way, the loud hitting sound generated at the time of hitting may adversely affect the hit feeling of the golfer. In general, as the thickness of the face portion is reduced, the amplitude of the face portion at the time of hitting is increased, so that the hitting sound is increased and the vibration continues for a long time.

  On the other hand, in the golf club head according to the present embodiment, a resin plate is attached to the back surface of the hit ball portion in the face portion. The resin plate makes it easy to attenuate the vibration of the face portion generated at the time of hitting. Specifically, by attaching the resin plate, it is possible to increase the loss factor of the vibration that generates the hitting sound. Therefore, the time for attenuating the hitting sound is shortened and the hitting feeling is improved.

  Here, a method for measuring the natural frequency of the head that affects the hitting sound will be described. FIG. 16 shows a schematic diagram of a natural frequency measuring device of the head part 101 (face part), and FIG. 17 shows a block diagram thereof. Table 1 shows the measurement apparatus used in this experiment.

  As shown in FIGS. 16 and 17, the head unit 101 is placed on the impedance head 109 of the vibration generator 108, and the head unit 101 is vibrated by the vibration generator 108. A force pickup signal and an acceleration pickup signal are input from the impedance head 109 to the mechanical impedance measurement amplifier 110, and a signal from the mechanical impedance measurement amplifier 110 is input to the noise / vibration analyzer 111.

  Data from the noise / vibration analyzer 111 is input to the computer system 112, and a natural frequency is obtained. The noise / vibration analyzer 111 is connected to a power amplifier 113, and predetermined power is given to the vibration generator 108 by the power amplifier 113.

  Since the amplitude of the face portion at the time of hitting is the largest in the hitting portion, the resin plate is installed on the back surface of the hitting portion. In addition, the resin plate may be attached only within the hitting ball portion in the face portion, or may be attached over the inside and outside of the hitting ball portion.

  While the above-described attenuation effect is ensured by making the resin plate thick to some extent, it can be sufficiently obtained below a certain thickness. Therefore, it is not preferable to make the resin plate extremely thick from the viewpoint of durability and the like. This is because if the resin plate is too thick, for example, the resin plate protrudes from the cavity of the iron golf club head, thereby causing problems such as being easily scratched during use. In the present embodiment, by setting the thickness of the resin plate in the above range, it is possible to obtain the above-described effect of attenuating the hitting sound while suppressing problems such as a decrease in durability.

  The thickness of the resin plate is typically the largest at the central portion and is formed so as to decrease from the central portion toward the peripheral portion. However, as long as the same effect as described above is obtained, the thickness is the same over the entire surface of the resin plate. You may form so that it may become thickness, and you may form so that a center part may be thin and a peripheral part may become thick.

  As the material of the resin plate, typically, ABS (Acrylonitrile Butadiene Styrene) resin is used, but other resin materials may be used. Specifically, for example, a polymer alloy obtained by mixing an ABS resin, a PC (Polycarbonate) resin, a PBT (Polybutylene Terephthalate) resin, a PA (Polyamide) resin, or the like can be used.

  By using the above materials, an increase in cost can be suppressed. In addition, these resin materials are easy to process and do not rust like metal.

  The resin plate typically has a shape (horizontal shape) in which the horizontal length is longer than the vertical length when the golf club head is addressed. Good. Further, as the shape, any shape such as a circular shape, an elliptical shape, a polygonal shape, or a combination of these shapes can be applied.

  The resin plate is typically attached to the back surface of the face part via a double-sided tape. In addition, you may attach using an adhesive etc. instead of a double-sided tape.

  Here, it is preferable to form a pedestal on the back surface of the hit ball portion in accordance with the shape of the resin plate. The shape of the pedestal typically matches the shape of the resin plate, but the pedestal may protrude slightly from the periphery of the resin plate, or the resin plate may protrude slightly from the periphery of the pedestal. . In these cases, the shape of the pedestal should be interpreted as being formed in accordance with the shape of the resin plate.

  In addition, as described above, the resin plate may be installed only in the hitting ball part, or may be installed in and out of the hitting ball part, so that the pedestal formed in accordance with the shape of the resin plate is only in the hitting ball part. There are cases where it extends, and cases where it extends over the inside and outside of the hit ball portion.

  The pedestal is typically formed integrally with the face part, but the pedestal may be formed separately from the face part.

  By forming the pedestal, the resin plate can be easily attached at a predetermined position when manufacturing the golf club head. As a result, it is possible to obtain a golf club head capable of stably ensuring the impact sound attenuation effect.

  In addition, it is good also as a structure which attaches a resin plate to the face part back formed flat, without forming said base.

  By the way, at the time of hitting, the resin plate is deformed according to the deflection of the face portion. Here, when the resin plate is difficult to be deformed, a force for peeling the resin plate from the back surface of the face portion acts on the peripheral portion of the resin plate. Therefore, when the resin plate is thick and its bending rigidity is large, the resin plate may be easily peeled off by repeated hitting.

  On the other hand, in this Embodiment, a groove part is provided in the resin plate. Thereby, the resin plate can be easily deformed according to the deflection of the face portion. As a result, peeling of the resin plate due to repeated hitting can be suppressed.

  The groove is typically formed on the back side of the resin plate (the surface on the side bonded to the back of the face portion), but may be formed on the front side of the resin plate.

  As the direction in which the groove extends, any direction can be selected, and grooves extending in different directions may be used together on one resin plate. Further, the groove portion may be formed so as to extend in a substantially linear shape, or may be formed so as to include a portion extending in a curved shape. Moreover, a groove part may be provided only in the center part or peripheral part of a resin plate, and may be provided so that it may extend to both a center part and a peripheral part. Moreover, it is good also as a structure which arrange | positions the some divided | segmented resin plate suitably. In this case, the same effect as that provided by the groove can be obtained.

  When a plurality of groove portions are formed on a single resin plate, typically, the groove portions are formed so that the widths thereof are equal, but groove portions having different widths may be mixed. Moreover, the depth of a groove part can be changed arbitrarily.

  The above-described force for peeling the resin plate from the back surface of the face portion is the largest at the end portion in the longitudinal direction of the resin plate.

  Therefore, the groove is preferably formed so as to extend in a direction perpendicular to the longitudinal direction of the resin plate. Thereby, since the bending rigidity of the longitudinal section of the resin plate can be reduced, it is possible to reduce the force for peeling the resin plate from the face portion at the longitudinal end portion of the resin plate. As a result, peeling of the resin plate from the back surface of the face due to repeated hitting can be suppressed.

  In the more preferable embodiment described above, the groove portion typically extends in a direction perpendicular to the longitudinal direction of the resin plate. However, even if this direction is a direction substantially perpendicular to the longitudinal direction of the resin plate, the same effect is obtained. It is thought to play.

  The bonding area where the resin plate is fixed to the back surface of the face portion is 25% or more and 100% or less of the area of the back surface of the face portion (more preferably about 30% or more and 80% or less, more preferably 40% or more and 70% or less). Degree).

  If the area of the resin plate is extremely small, the above-described attenuation effect may not be sufficiently obtained. On the other hand, by setting the area of the resin plate to the area of the back surface of the face within the above range, vibration that generates a hitting sound can be efficiently attenuated. As a result, the effect of improving the hit feeling can be more sufficiently ensured. In addition, if the ratio of the area of the resin plate with respect to the area of the back surface of a face part is more than a certain value, said effect is fully securable.

  A golf club according to the present embodiment includes the above-described golf club head.

  As described above, in the golf club head according to the present embodiment, the hitting sound is easily attenuated. Therefore, by providing this golf club head, it is possible to obtain a golf club excellent in hit feeling.

  FIG. 1 is a diagram showing a comparison of the distortion amount of the face part at the time of hitting balls for two iron golf club heads (sample 1 and sample 2) having different face part thicknesses. Note that the sizes of the face portions of Samples 1 and 2 are substantially the same.

  Here, sample 1 has a face portion thickness of 2.3 mm (a peripheral portion thickness is 2.0 mm), and sample 2 has a face portion thickness of a 2.8 mm (peripheral portion). The thickness is 2.3 mm).

  Comparing sample 1 and sample 2, it can be seen that sample 1 has a larger amount of distortion of the face portion at the time of hitting than sample 2 (about 2.4 times in FIG. 1).

  Here, the coefficient of restitution (COR) of sample 1 was 0.787, and the coefficient of restitution of sample 2 was 0.770. Therefore, it can be seen that the distance of the thin type face portion is increased.

  FIG. 2 is a diagram illustrating a state in which the iron golf club head according to the first embodiment is viewed from the back side of the face.

  As shown in FIG. 2, the iron golf club head 1 includes a resin badge 3 (resin plate) in a cavity portion 2 formed on the back side of the face portion. The resin badge 3 extends in the toe-heel direction corresponding to the shape of the cavity portion 2.

  FIG. 3 is a view showing a cross section in the toe-heel direction of the iron golf club head 1 (III-III cross section in FIG. 2).

  As shown in FIG. 3, the iron golf club head 1 is an iron golf club head having a cavity portion 2, and has a groove portion 6 between the face portion 4 and the protruding wall portion 8. The face portion 4 has a hitting ball portion 40 at the center portion, a sole side portion 5A on the sole portion 5 side with respect to the center portion, and a top edge side portion 7A on the top edge 7 side with respect to the center portion.

  The face portion 4 has a pedestal 4 </ b> A in a region including the hit ball portion 40 on the back surface (surface opposite to the hit ball surface). On the base 4A, the resin badge 3 is attached according to the shape. The resin badge 3 is attached to the pedestal 4A using a double-sided tape so that the entire surface is joined to the pedestal 4A.

  In addition, the thickness (t1 in FIG. 3) of the hit ball portion 40 including the base 4A is about 2.3 mm, and the thickness of the sole side portion 5 and the top edge side portion 7 (t2 in FIG. 3) is about 2. 0.0 mm. Moreover, the thickness (t in FIG. 3) of the center part of the resin badge 3 is about 3.5 mm.

  FIG. 4 is a diagram illustrating a state in which the resin badge 3 is viewed from the front surface (the surface opposite to the side to be bonded to the face portion 4).

  As shown in FIG. 4, the resin badge 3 has a combination of a straight line and a curved line, and a pattern 3 </ b> A such as a logo mark is displayed on the surface thereof. As this resin badge 3, the thing which plated the surface of the ABS resin is used.

  FIG. 5 is a diagram illustrating a state in which the resin badge 3 is viewed from the back side.

  As shown in FIG. 5, grooves 9 (9 </ b> A, 9 </ b> B, 9 </ b> C) are formed on the back surface of the resin badge 3 in a direction perpendicular to the longitudinal direction of the resin badge 3. Similarly, a convex portion 10 is formed on the back surface of the resin badge 3. The pedestal 4 </ b> A is provided with a concave portion corresponding to the convex portion 10. Thereby, alignment with the resin badge 3 and the base 4A becomes easy.

  The length of the resin badge 3 in the longitudinal direction (L in FIG. 5) is about 55.6 mm, and the length of the grooves 9A, 9B, 9C (h1, h2, h3 in FIG. 5) is about 20 respectively. 3 mm, about 20.7 mm, and about 18.5 mm. Further, the width of the grooves 9A, 9B, 9C (B in FIG. 5) is about 1 mm, and they are formed at an interval of about 7 mm (L1 in FIG. 5). Furthermore, the distance (H in FIG. 5) from the edge of the grooves 9A, 9B, 9C to the periphery of the resin badge 3 is about 1 mm. These values can be changed as appropriate.

  The depth of the groove portion 9 is set so that the remaining thickness of the resin badge 3 in the groove forming portion is about 0.8 mm. That is, for example, in the case of a resin badge having a thickness of about 3.5 mm, the depth of the groove portion 9 is about 2.7 mm (3.5−0.8 = 2.7 mm).

  FIG. 6 is a diagram showing the relationship between the presence or absence of the resin badge and the loss factor. In FIG. 6, a sample without a resin badge (no badge), a sample with a resin badge with a maximum thickness of about 3.5 mm (thick resin badge), and a maximum thickness of about 1.8 mm. The result of having experimented with the sample (thin resin badge) which attached the resin badge is shown. In any sample, the natural frequency of the head is about 1275 Hz. Therefore, the frequency of the hitting sound is also dominant at about 1275 Hz.

  As shown in FIG. 6, when the resin badge is attached, the loss factor is increased as compared with the case where the resin badge is not attached. Therefore, it can be seen that by attaching the resin badge, the hitting sound is easily attenuated, and even a thin resin badge is slightly improved in hit feeling.

  In addition, the loss factor is further increased when a thick resin badge is attached as compared to when a thin resin badge is attached. Here, if the maximum thickness of the resin badge 3 is about 2.6 mm or more and about 10 mm or less, the loss coefficient becomes about 0.011 or more, and the effect of attenuating the hitting sound and improving the hit feeling can be sufficiently obtained. I have confirmed that I can do it. In addition, about this maximum thickness, More preferably, it is about 2.8 mm or more and 5.0 mm or less, More preferably, it is about 3.0 mm or more and 4.0 mm or less.

In this embodiment, the area (cavity area) of the back surface of the face portion of the iron golf club head 1 is about 1950 mm ² , whereas the area of the resin badge 3 projected on the back surface of the face portion is about 940 mm ² . . Therefore, the ratio of the area of the resin badge 3 to the area of the back surface of the face portion is about 48.2%. For example, when a resin badge having a maximum thickness of about 3.5 mm is used, the above ratio is about 25 percent or more and 100 percent or less (more preferably, about 30 percent or more and 80 percent or less, more preferably 40 percent or more. If it is about 70 percent or less), it has been confirmed that a sufficient loss coefficient can be secured and the effect of improving the hit feeling can be obtained in the same manner as described above. If the thickness of the resin badge is about 2.6 mm or more, the same loss factor can be secured as when the thickness is about 3.5 mm. Therefore, the resin badges of other thicknesses have the same area with the same area. It is thought that there is an effect.

  FIG. 7 is a diagram showing the relationship between the thickness of the resin badge and the amount of deflection at the center of the resin badge when a certain bending moment is applied to the resin badge 3.

  As shown in FIG. 7, as the resin plate thickness increases, the amount of deflection of the plate decreases even when the same force is applied. Therefore, the resin plate 3 may be easily peeled off from the base 4A by repeated hitting.

  On the other hand, in this embodiment, as shown in FIG. 5, a groove 9 is provided on the back surface of the resin badge 3 to reduce the bending rigidity of the badge so that it can be easily deformed.

  8 to 12 are modified examples regarding the installation form of the groove 9.

  As shown in FIG. 8, the groove portions 9 extending in the width direction (vertical direction in FIG. 8) of the resin badge 3 may be installed more (seven) than FIG. 5 (three), or as shown in FIG. In this way, the position of the groove 9 extending in the width direction may be shifted from the position shown in FIG. Further, as shown in FIG. 10, the groove portions 9 may be provided so as to cross in a cross shape, or the groove portions 9 may be provided radially as shown in FIG. Moreover, as shown in FIG. 12, you may mix the groove part 9 from which width differs. Moreover, it is good also as arrangement | positioning which combined the characteristic part shown in FIGS. 8-12.

  FIG. 13 is a cross-sectional view in the toe-heel direction of the iron golf club head 1 according to the second embodiment.

  The iron golf club head according to the present embodiment is a modification of the iron golf club head according to the first embodiment, and is different from the first embodiment with respect to the shape of the groove 6 as shown in FIG.

  Also in this embodiment, the same attenuation effect as that described above can be obtained. That is, in the iron golf club head, the effect of improving the hit feeling can be obtained by installing the resin plate 3 regardless of the structure of the cavity portion.

  Since other matters are the same as those in the first embodiment, the description thereof is omitted here.

  FIG. 14 is a perspective view illustrating the wood head 11 according to the third embodiment.

  As shown in FIG. 14, the wood head 11 according to the present embodiment includes a heel portion 12, a face portion 13, a sole portion 14, a toe portion 15, a crown portion 16, and a back portion 17. It is connected to the shaft 18.

  FIG. 15 is a view showing a cross section of the wood head 11 in the toe-heel direction (XV-XV cross section in FIG. 14).

  As shown in FIG. 15, a pedestal 13A is provided on the back surface (the surface opposite to the ball striking surface) of the face portion 13, and the resin badge 3 is mounted on the pedestal 13A. In addition, as a mounting method of the resin badge 3, the following methods can be considered, for example. First, the wood head 11 excluding the face portion is formed by casting, and the face portion is formed by forging. Thereafter, the resin badge 3 is attached to the face portion, and the face portion is attached to the wood head 11 by welding or the like.

  Also in this embodiment, the same attenuation effect as that described above can be obtained. That is, the improvement in hitting feeling due to the resin badge can be obtained also in the wood head.

  Since other matters are the same as those in the first embodiment, the description thereof is omitted here.

  Although the embodiments and examples of the present invention have been described above, it is planned from the beginning to appropriately combine the characteristic portions of the above-described examples. Further, it should be considered that the embodiments and examples disclosed this time are examples in all respects and are not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows what compared the deflection amount of the face part at the time of a ball hit about the iron golf club head from which the thickness of a face part differs. It is a figure showing the state where the iron golf club head concerning Example 1 of the present invention was seen from the face back side. It is a figure which shows the III-III cross section in FIG. It is a figure which shows the state which looked at the resin badge attached to the iron golf club head which concerns on Example 1 of this invention from the surface side. It is a figure which shows the state which looked at the resin badge attached to the iron golf club head which concerns on Example 1 of this invention from the back surface side. It is the figure which showed the relationship between the presence or absence of the attachment of a resin badge, and the loss coefficient of a hitting sound. It is the figure which showed the relationship between the resin badge thickness at the time of making a fixed bending moment act on a resin badge, and the deflection amount of the resin badge center part. It is a figure which shows the modification regarding the installation mode of the groove part formed in a resin badge. It is a figure which shows the other modification regarding the installation mode of the groove part formed in a resin badge. It is a figure which shows the further another modification regarding the installation mode of the groove part formed in a resin badge. It is a figure which shows the further another modification regarding the installation mode of the groove part formed in a resin badge. It is a figure which shows the further another modification regarding the installation mode of the groove part formed in a resin badge. It is a figure which shows the cross section of the toe-heel direction of the iron golf club head which concerns on Example 2 of this invention. It is the perspective view which showed the wood head based on Example 3 of this invention. It is a figure which shows the XV-XV cross section in FIG. It is the schematic of a natural frequency measuring device. It is a block diagram of a natural frequency measuring device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Iron golf club head, 2 cavity part, 3 resin badge, 3A pattern, 4,13 face part, 4A, 13A base, 5 sole part, 5A sole side part, 6 groove part, 7 top edge part, 7A top edge side part , 8 Projection wall part, 9 groove part, 10 convex part, 11 wood head, 12 heel part, 14 sole part, 15 toe part, 16 crown part, 17 back part, 18 shaft, 40 hitting ball part, 101 head part, 108 vibration Generator, 109 Impedance head, 110 Mechanical impedance measurement amplifier, 111 Noise / vibration analyzer, 112 Computer system, 113 Power amplifier.

Claims (6)

A golf club head having a hit ball portion thickness of 1.5 mm to 3.0 mm in the face portion,
A golf club head in which at least one resin plate having a maximum thickness of 2.6 mm or more and 10 mm or less is attached to the back surface of the hit ball portion.   The golf club head according to claim 1, wherein a pedestal is formed on the back surface of the hit ball portion in accordance with the shape of the resin plate.   The golf club head according to claim 1, wherein a groove is provided in the resin plate.   The golf club head according to claim 3, wherein the groove portion is formed to extend in a direction perpendicular to the longitudinal direction of the face portion.   5. The golf club head according to claim 1, wherein an area of the resin plate is 25 percent or more and 100 percent or less of an area of the back surface of the face portion.   A golf club comprising the golf club head according to claim 1.

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