Golf club, attachment / detachment unit of vibration transmission member, attachment / detachment unit of tuning fork-type sound-generation body, attachment / detachment unit of reinforcement member, golf practice system, grip for golf club, and portable mobile terminal

Abstract

A golf club (1) of the present disclosure is provided with: a head (3) having a striking surface (2) for striking a golf ball; a shaft (5) having a shaft shape; a hosel (4) connecting the head (3) to one end of the shaft (5); and a grip (6) that is provided at the other end of the shaft (5) and is to be gripped by a user. The hosel (4) is integrally formed with the head (3) and the shaft (5) in a non-replaceable state. A first cavity (9) formed in a hollow space inside the shaft (5). A second cavity (10) that communicates with the first cavity (9) is formed in a hollow space in the grip (6). A vibration transmission member (20) is provided that is formed in an elongated shape, has one end fixed to the hosel (4), is built inside the first cavity (9) and the second cavity (10), and transmits vibration generated at the striking surface (2) to the grip (6). Attachment members (23, 24) for linking the grip (6) to the other end of the vibration transmission member (20) are provided inside the second cavity (10).

Description

Golf club, vibration transmission member detachment unit, tuning fork type sound generating body detachment unit, reinforcing member detachment unit, golf practice system, golf club grip and portable mobile terminal

[0001] The present invention relates to a golf club for hitting a golf ball, a detachable unit for a vibration transmission member, a detachable unit for a tuning fork-type sounding body, a detachable unit for a reinforcing member, a golf practice system using a golf club, a golf club grip, and a portable mobile terminal.

[0002] Conventionally, golf clubs such as woods, irons, hybrids, utilities, and putters have been known in which a shaft with a grip is connected to a head by a hosel. The hosel is removably fixed to, for example, the shaft or the head. This structure makes it easy to replace the shaft or the head (see Patent Documents 1 and 2).

[0003] JP 2021-058337 A JP 2014-036894 A

[0004] In the case of a golf club with a hosel, vibrations generated in the head when hitting a golf ball are transmitted via the shaft to the palm of the user (golfer) holding the grip, and are perceived as part of the feel of the golf club. However, the hosel interposed between the shaft and the head can act to inhibit the transmission of such vibrations. Therefore, golf clubs with hosels have a problem in that they are less likely to provide a good feel when hitting a golf ball compared to golf clubs without hosels. The "feel" refers to the feeling or shot sensation experienced by the user when hitting a golf ball. A typical feel includes not only physical vibrations but also sensory comfort (feelings) of the club, such as the feel of the impact, the sense of control, and the sense of accomplishment.

[0005] One of the objects of the present invention was invented in light of the above-mentioned problems, and is to provide a golf club, a detachable unit for a vibration transmission member, a detachable unit for a tuning fork-type sounding body, a detachable unit for a reinforcing member, a golf practice system, a golf club grip, and a portable mobile terminal that are capable of improving the feel of hitting. Furthermore, in addition to this object, another object of the present invention is to achieve effects derived from the various configurations shown in the "Mode for Carrying Out the Invention" described below, which cannot be obtained with conventional technology.

[0006] The present invention can be realized in the following embodiments or application examples. The disclosed golf club solves at least part of the above-mentioned problems. (1) The disclosed golf club includes a head having a striking surface for striking a golf ball, an axial shaft, a hosel connecting one end of the shaft to the head, and a grip attached to the other end of the shaft and held by a user. The hosel is formed integrally with the head and the shaft in an irreplaceable manner, the shaft has a hollow first cavity therein, and the grip has a hollow second cavity therein communicating with the first cavity. The grip is formed integrally with the shaft, has an elongated shape, has one end fixed to the hosel, is housed in the first cavity and the second cavity, and transmits vibrations generated at the striking surface to the grip, and an attachment member provided inside the second cavity and connecting the other end of the vibration transmission member to the grip.

[0007] (2) The disclosed golf club comprises a head having a striking surface for striking a golf ball, an axially formed shaft, a hosel connecting one end of the shaft to the head, and a grip attached to the other end of the shaft and held by a user, the hosel being formed integrally with the head and the shaft in an irreplaceable manner, the shaft having a first hollow cavity therein, the grip having a second hollow cavity therein that communicates with the first cavity, the grip being formed integrally with the shaft, one end of the grip being fixed to the hosel, and the grip comprising a tuning fork-shaped sounding body that vibrates in response to the impact of striking the golf ball with the striking surface to produce sound.

[0008] (3) The disclosed detachable unit of the vibration transmission member includes a head having a striking surface for striking a golf ball, an axial shaft, a hosel connecting one end of the shaft to the head, and a grip attached to the other end of the shaft and held by a user. The detachable unit is detachably attached to a golf club, the shaft having a hollow first cavity therein and the grip having a hollow second cavity therein that communicates with the first cavity. The detachable unit is also equipped with a main body portion that is housed in the first cavity and the second cavity, extends in the axial direction of the shaft, has a cylindrical shape that conforms to the inner circumferential shapes of the first cavity and the second cavity, and has a hollow portion therein; and a vibration transmission member that is elongated, has one end fixed to the lower end of the main body, is housed in the hollow portion, and transmits vibrations generated at the striking surface to the grip. (4) The disclosed detachable unit of the vibration transmission member comprises a head having a striking surface for striking a golf ball, an axially formed shaft, and a grip provided at the other end of the shaft and held by a user, the shaft having a hollow first cavity therein, and the grip having a hollow second cavity therein that is connected to the first cavity, the detachable unit being detachably attached to a golf club, the shaft having a hollow first cavity therein, the grip having a hollow second cavity therein that is connected to the first cavity, the main body being built into the first cavity and the second cavity, extending in the axial direction of the shaft and having a cylindrical shape that follows the inner circumferential shape of the first cavity and the second cavity, and having a hollow hollow therein, and a vibration transmission member having an elongated shape, one end of which is fixed to the lower end of the main body, built into the hollow cavity, and transmitting vibrations generated at the striking surface to the grip.

[0009] (5) The detachable unit of the disclosed tuning fork-type sounding body includes a head having a striking surface for striking a golf ball, an axially formed shaft, a hosel connecting one end of the shaft to the head, and a grip provided on the other end of the shaft for being held by a user. The shaft is detachably attached to a golf club having a hollow first cavity therein, the shaft is housed in the first cavity, the main body extends in the axial direction of the shaft, has a cylindrical shape that conforms to the inner circumferential shape of the first cavity, and has a hollow portion therein; and the tuning fork-type sounding body is formed in an elongated shape, has one end fixed to the lower end of the main body, is housed in the hollow portion, and vibrates due to the impact of striking the golf ball with the striking surface, thereby emitting sound. (6) The detachable unit of the disclosed tuning fork-type sounding body comprises a head having a striking surface for striking a golf ball, an axially formed shaft, and a grip provided at the other end of the shaft to be held by a user, and the shaft is detachably attached to a golf club having a hollow first cavity portion formed therein, and the shaft is housed in the first cavity, extends in the axial direction of the shaft, has a cylindrical shape that follows the inner circumferential shape of the first cavity portion, and has a hollow portion formed therein, and a tuning fork-type sounding body that is formed in an elongated shape, has one end fixed to the lower end of the main body, is housed in the hollow portion, and vibrates due to the impact of striking the golf ball with the striking surface, thereby emitting sound.

[0010] (7) The disclosed detachable unit of the reinforcing member includes a head having a striking surface for striking a golf ball, an axially formed shaft, a hosel connecting one end of the shaft to the head, and a grip provided at the other end of the shaft for being held by a user. The shaft is detachably attached to a golf club having a hollow first cavity therein, and includes a main body portion that is housed in the first cavity, extends in the axial direction of the shaft, has a cylindrical shape that conforms to the inner circumferential shape of the first cavity, and has a hollow portion therein; and a reinforcing member that is housed in the hollow cavity and reinforces the strength of the shaft. (8) The detachable unit of the disclosed reinforcing member comprises a head having a striking surface for striking a golf ball, an axially formed shaft, and a grip provided at the other end of the shaft to be held by a user, and is detachably attached to a golf club having a hollow first cavity portion formed therein, the shaft being housed in the first cavity portion, extending in the axial direction of the shaft and having a cylindrical shape that conforms to the inner circumferential shape of the first cavity portion, and having a hollow portion formed therein, and a reinforcing member housed in the hollow portion that reinforces the strength of the shaft.

[0011] (9) The disclosed golf practice system includes: a cup provided on a rolling surface (golf ball rolling surface) of a golf ball hit by the golf club described in (1) or (2); a hitting area separated from the cup and having the golf ball rolling surface; a rod-shaped pin that is inserted and removed from the cup and serves as a marker for the cup; a first illuminator attached to the pin and irradiating a guide laser beam that indicates a straight line from the pin toward the hitting area; a first light receiver attached to the golf club and capable of receiving the guide laser beam from the first illuminator; a second illuminator attached to the golf club and irradiating a guide sub-laser beam from the golf club toward the pin; a second light receiver attached to the pin and capable of receiving the guide sub-laser beam from the second illuminator; and an indicator that receives the guide laser beam with the first light receiver and, when the second light receiver receives the guide sub-laser beam, displays that information.

[0012] (10) The disclosed golf practice system includes a golf practice machine having a cup provided on the rolling surface (golf ball rolling surface) of a golf ball hit by the golf club described in (1) or (2), and a hitting area separated from the cup and having the golf ball rolling surface, wherein a user standing in the hitting area hits the golf ball with the golf club toward the cup; a pin unit having a first image capturing means attached to a rod-shaped pin that marks the cup and captures an image from the pin toward the hitting area; a second transmission device that transmits first image data captured by the first image capturing means to an external device; and a first irradiator that irradiates a guide laser beam from the pin toward the hitting area; vibration detection means attached to the golf club used by the user in the hitting area and that detects vibration information related to the vibration transmitted by the vibration transmission member; and second detection means built into the head that detects impact information related to the impact of the golf ball; a club unit having a second photographing means for photographing an image from the head toward the front, a second irradiator for irradiating a guide sub-laser light from the head toward the front, and a third transmitting device for transmitting the vibration information, the impact information, and second image data photographed by the second photographing means to an external device; a first receiving device for receiving, as monitor information, at least one of the cup-in information transmitted from the first transmitting device, the first image data transmitted from the second transmitting device, and the vibration information, the impact information, and the second image data transmitted from the third transmitting device; a control unit having a control device for generating guide information for providing guidance for the user's golf play based on the monitor information, and a fourth transmitting device for transmitting the guide information to an external device; a second receiving device for receiving the guide information transmitted from the fourth transmitting device, and a presenter for presenting guidance for golf play based on the guide information, and a terminal device portable by the user.

[0013] (11) The disclosed golf club grip is a golf club having a shaft formed in an axial shape, a head provided at one end of the shaft and having a striking surface for striking a golf ball, and a grip provided at the other end of the shaft and held by a user, and the grip is provided with a grip member made of a mesh member formed from resin fibers in a net shape.

[0014] (12) The disclosed golf club is the golf club described in (1) above, wherein the head has a weight member for changing the position of the center of gravity of the head. (13) The disclosed golf club is also the golf club of (12) above, wherein the weight member is provided inside a hollow cylindrical recess formed in the top surface of the head, and includes a drive source for moving the weight member, and a control unit for controlling the drive source so that the drive source rotates the weight member along the inner surface of the recess. (14) The disclosed golf club is also the golf club of (12) above, wherein the weight member is provided inside a linear recess formed in the top surface of the head, and includes a drive source for moving the weight member, and a control unit for controlling the drive source so that the drive source slides the weight member along the inner surface of the recess. (15) The disclosed portable mobile terminal is a portable mobile terminal that exchanges control signals with the control unit of the golf club described in (13) or (14) above, and is equipped with an input unit that inputs an instruction to move the weight member to a desired position, and a display unit that monitors and displays the position of the weight member that has moved in response to the movement instruction from the input unit.

[0015] According to the disclosed golf club, by providing a vibration transmission member in the hosel, vibrations generated when striking a golf ball can be efficiently transmitted to the shaft, improving the feel of the impact. Furthermore, according to the disclosed golf club, the striking surface has a tuning-fork-type sounding body that vibrates and emits sound in response to the impact of striking the golf ball, thereby emphasizing the impact sound generated when striking the golf ball. This improves the feel of the impact when striking a golf ball, improving the feel of the impact.

[0016] The disclosed detachable unit for a vibration transmission member makes it easy to attach and detach the vibration transmission member to and from a golf club. The disclosed detachable unit for a tuning fork-type sounding body makes it easy to attach and detach the tuning fork-type sounding body to and from a golf club. The disclosed detachable unit for a reinforcing member makes it possible to reinforce the shaft of a golf club. The detachable unit for a vibration transmission member and the detachable unit for a tuning fork-type sounding body can also reinforce the shaft of a golf club. Reinforcing the shaft with a detachable unit allows the thickness of the shaft to be reduced while maintaining the strength of the shaft, thereby improving the vibration transmissibility of the shaft. This emphasizes the impact vibrations and improves the feel of the hit.

[0017] The disclosed golf practice system can improve the effectiveness of practice. Furthermore, the disclosed golf practice system includes vibration information related to the vibration of the vibration transmission member in the monitor information, making it possible to provide guidance based on the vibration information. For example, the system can analyze the correlation between the vibration information and hitting information (other monitor information) (e.g., the relationship between vibration and the quality of the hit) and present the analysis results, or accumulate the analysis results and provide feedback to the user. Furthermore, the system can visualize the vibration information using numerical values, graphs, etc., and accumulate the vibration information as big data.

[0018] The disclosed golf club grip has a mesh-like grip member made of resin fibers, which tends to transmit vibrations from the shaft to the user's hand through the grip member, improving the feel of the impact. The disclosed mobile terminal also allows for easy and visually understandable adjustment of the weight member's position.

[0019] (A) is a perspective view illustrating a golf club according to a first embodiment, and (B) is a perspective view illustrating a modified hosel of the golf club according to the first embodiment. (A) to (C) are perspective views illustrating types of golf club heads. (A) to (F) are perspective views illustrating modified connections between the hosel and shaft of a golf club. (A) to (D) are perspective views illustrating modified hosels of a golf club. (A) to (C) are cross-sectional views illustrating the internal structure of the golf club shown in FIG. 1(A). (A) to (C) are cross-sectional views illustrating the internal structure of the golf club shown in FIG. 1(B). (A) and (B) are cross-sectional views illustrating modified internal structures of the golf club shown in FIG. 7(A) and (B). (A) to (C) are cross-sectional views illustrating modified internal structures of the golf club. (A) and (B) are cross-sectional views illustrating modified internal structures of the golf clubs shown in Figures 9(B) and (C). (A) and (B) are cross-sectional views illustrating modified internal structures of the golf clubs shown in Figure 10(B). (A) and (B) are cross-sectional views illustrating modified internal structures of the golf clubs shown in Figures 11(A) and (B). (A) to (C) are explanatory diagrams illustrating modified internal structures of golf clubs. (A) and (B) are cross-sectional views illustrating modified vibration transmission members. (A) to (G) are explanatory diagrams illustrating modified vibration transmission members. (A) to (F) are cross-sectional views illustrating modified vibration transmission members. (A) and (B) are cross-sectional views illustrating modified vibration transmission members. (A) to (D) are cross-sectional views illustrating modified golf clubs. (A) to (E) are explanatory diagrams illustrating modified hosels of golf clubs. (A) to (E) are cross-sectional views illustrating modified vibration transmission members. 23A and 23B are cross-sectional views for explaining modified internal structures of golf clubs; (A) and (B) are perspective views for explaining modified heads of golf clubs; (C) are perspective views for explaining modified golf clubs; and (D) are explanatory views for explaining modified golf clubs of the golf club shown in FIG.23 and 24. FIG. 22 is a processing block diagram for explaining a modified example of a golf club. FIG. 35 is a processing block diagram for explaining a modified example of a golf club. FIG. 36 is a processing block diagram for explaining a modified example of a golf club. FIG. 37 is a processing block diagram for explaining a modified example of a golf club. FIG. 38 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club. FIG. 39 is a processing block diagram for explaining a modified example of a golf club.

[0020] [I. Description of the First Embodiment] [1. Structure] FIG. 1A is a perspective view illustrating a golf club 1 (putter) according to a first embodiment. The golf club 1 includes a head 3, a hosel 4, a shaft 5, and a grip 6. A striking surface 2 (face) for striking a golf ball is provided on the side of the head 3. The hosel 4 is a joint member connecting the lower end (one end) of the shaft 5 to the head 3. Connecting the lower end of the shaft 5 to the head 3 via the hosel 4 makes it easier to connect the lower end of the shaft 5 to the head 3 compared to a structure without a hosel. The shape of the hosel 4 is not particularly limited and may be any well-known shape. The golf club 1 of FIG. 1A includes, as an example of the hosel 4, a crank-shaped hosel 4A having a first bend 4F and a second bend 4R (two bends) intermediate between an upper end 4U and a lower end 4D. 1B is provided with a flat hosel 4B, which is formed in a rectangular flat plate shape having a certain thickness and extends in a plane parallel to the striking surface 2, as another example of the hosel 4. In the following description, unless a distinction is required, the term "hosel 4" will be used to collectively refer to hosels of various shapes.

[0021] Figures 2(A) to (C) are perspective views illustrating various types of putter heads 3. The shape of the head 3 may be a pin type as shown in Figure 2(A), a mallet type as shown in Figure 2(B), or a neo-mallet type as shown in Figure 2(C). Note that Figures 2(A) to (C) show an example of a golf club 1 having a flat hosel 4B as shown in Figure 1(B), but the shape of the hosel 4 may be any shape, including the crank-shaped hosel 4A shown in Figure 1(A).

[0022] The shaft 5 is formed in an axial (long, thin rod-like) shape, and one end (the lower end in FIG. 1 ) thereof is connected to the head 3 via the hosel 4. The shape of the lower end of the shaft 5 fixed to the hosel 4 may be straight, as shown in FIGS. 1A and 1B , or may be crank-shaped (see FIG. 4A described below) with two or more bends such that the upper end is positioned further forward than the lower end, or may be bent (curved). In this specification, the direction in which the striking surface 2 faces when using the golf club 1 is referred to as the "forward" direction, and the opposite side is referred to as the "rear" direction.

[0023] The cross-sectional shape of the shaft 5 may be circular, elliptical, or polygonal. A grip 6, which is the part that is held by the user, is provided at the other end (the upper end in FIG. 1 ) of the shaft 5. Like the shaft 5, the cross-sectional shape of the grip 6 may be circular, elliptical, or polygonal.

[0024] The hosel 4 is formed integrally with the head 3 and the shaft 5 in an irreplaceable manner, for example. FIGS. 3A to 3F are perspective views illustrating several specific examples of the connection between a rectangular, flat hosel 4B (hosel 4) and the shaft 5. The shaft 5 may be connected to the end face of the hosel 4 as shown in FIG. 3A, or to the plate surface of the hosel 4 as shown in FIG. 3B. The thickness of the hosel 4 (the dimension in the plate thickness direction) can be set independently of the diameter of the shaft 5. When the shaft 5 is thicker than the thickness of the hosel 4, the cross-sectional area of ​​the lower end of the shaft 5 may be reduced as shown in FIG. 3C. The hosel 4 may be detachably attached to the head 3 and the shaft 5.

[0025] The width of the hosel 4 when viewed from the front can also be set independently of the thickness of the shaft 5. For example, as shown in FIG. 3(D), the width of the hosel 4 may be set to approximately the same as the thickness of the shaft 5. Alternatively, the hosel 4 may be formed so that its width is smaller only at the upper end connected to the shaft 5. In this case, as shown in FIG. 3(E), the width of the upper end of the hosel 4 may be set to approximately the same as the thickness of the shaft 5. Alternatively, as shown in FIG. 3(F), the upper end of the hosel 4 may be thinner than the shaft 5.

[0026] The orientation of the hosel 4 fixed to the head 3 is set so that it extends in a planar direction parallel to the striking surface 2. For example, as shown in Figure 4(A), the hosel 4 may be arranged parallel to the striking surface 2. Alternatively, as shown in Figure 4(B), the flat hosel 4 may be arranged tilted at an angle (for example, with the upper part tilted toward the striking surface 2). Furthermore, the shape of the lower end of the shaft 5 fixed to the hosel 4 may be crank-shaped, as shown in Figure 4(A), or straight or bent (curved).

[0027] The hosel 4 may be formed in a flat plate shape or a bent plate shape. If the hosel 4 is formed in a flat plate shape, it may be formed in a rectangular plate shape as shown in FIG. 4A, or in a polygonal (triangular or pentagonal) plate shape. If the hosel 4 is formed in a bent plate shape, it may be curved so that the side closer to the striking surface 2 is inward in a longitudinal cross section perpendicular to the striking surface 2, as shown in FIG. 4C, or it may be curved so that the side closer to the striking surface 2 is outward. The hosel 4 may also be formed in a trapezoidal plate shape imitating the side shape of a horseshoe, as shown in FIG. 4D.

[0028] The hosel 4 and head 3 may be disposed so as to be flush with the striking surface 2 (forming the same plane) as shown in Figure 1(B), or may be disposed so as to be non-flush with the striking surface 2 (the hosel 4 is disposed rearward of the striking surface 2) as shown in Figures 3(A) to (F). Needless to say, in the various examples of how the hosel 4 and head 3 are disposed, such as Figures 3(A) to (F), the hosel 4 and head 3 may also be disposed so as to be flush with the striking surface 2 as shown in Figure 1(B).

[0029] <Hollow Portion> Of the head 3, hosel 4, shaft 5, and grip 6 included in the golf club 1, the shaft 5 and the grip 6 each have a hollow interior (a hollow portion therein). On the other hand, the head 3 and the hosel 4 each may have a hollow interior (a hollow portion therein) or may have a solid interior (no hollow portion therein). Figures 5(A), (B), and (C) are cross-sectional views showing the longitudinal section of the golf club 1 in Figure 1(A), illustrating an example in which the shaft 5 and the grip 6 each have a hollow portion therein, and the crank-shaped hosel 4A (hosel 4) and the shaft 5 each have a solid interior.

[0030] The golf clubs 1 shown in Figures 5(A), (B), and (C) are all the same except for the manner in which the hosel 4 and the shaft 5 are connected. Specifically, in the golf club 1 shown in Figure 5(A), the upper end of the hosel 4 and the lower end of the shaft 5 are butted together and connected. In the golf club 1 shown in Figure 5(B), the inner circumference of the upper end of the hosel 4 is set larger than the outer circumference of the lower end of the shaft 5, and the lower end of the shaft 5 is inserted into and connected to the upper end of the hosel 4. In the golf club 1 shown in Figure 5(C), the outer circumference of the upper end of the hosel 4 is set smaller than the inner circumference of the lower end of the shaft 5, and the upper end of the hosel 4 is inserted into and connected to the lower end of the shaft 5.

[0031] The shaft 5 has a hollow shaft cavity 9 (first cavity) therein, and the grip 6 has a hollow grip cavity 10 (second cavity) therein that communicates with the shaft cavity 9. Both the upper and lower ends of the shaft 5 are open. The upper end of the grip 6 is closed by a grip upper end plate 21 that forms the grip end, and the lower end is open. The shaft cavity 9 and the grip cavity 10 are in communication with each other. The head 3 and the hosel 4 are formed of a solid material having a compact cross section.

[0032] <Vibration Transmission Member> A vibration transmission member 20 is built into the golf club 1. The vibration transmission member 20 transmits vibrations generated on the striking surface 2 to the grip 6. The vibration transmission member 20 is formed in a long shape and is provided inside the shaft cavity 9 and the grip cavity 10. Specific examples of the vibration transmission member 20 include wire (e.g., steel wire or piano wire), string (e.g., strings made of various woven fibers, wide webbing, or mesh-like webbing), rod members (e.g., rod members made of rod-shaped metal or wood), linear elastic members (e.g., linear elastic members made of rubber or resin), and long coil springs. Examples of fibers include cellulose, nanocellulose, and cellulose nanofibers. Figures 5(A), 5(B), and 5(C) show an example in which the vibration transmission member 20 is formed from a rod member.

[0033] One end of the vibration transmission member 20 (the lower end in FIGS. 5A, 5B, and 5C) is directly fixed to the hosel 4 via a fixture 22. Meanwhile, the other end of the vibration transmission member 20 (the upper end in FIGS. 5A, 5B, and 5C) is attached to the inner circumferential surface of the grip 6 via a grip-interior plate 23 and a grip-interior fixture 24 (mounting member). The fixture 22 is, for example, a member attached to the upper end 4U of the hosel 4, and may have any structure as long as it can secure the lower end of the vibration transmission member 20. In this case, the vibration transmission member 20 is linearly disposed between the fixture 22 and the grip-interior fixture 24. As shown by the dashed line in FIG. 5A, a mass member 26 serving as a weight for amplifying vibrations may be attached to the vibration transmission member 20. The position of the mass member 26 may be fixed relative to the vibration transmission member 20 or may be movable (the fixed position may be adjustable). Furthermore, for example, a mass member 26 may be added according to the user's preference. The mass member 26 is not limited to the golf club 1 shown in FIG. 5A, and may be attached to any golf club 1.

[0034] Each of the golf clubs 1 shown in Figures 6(A), (B), and (C) has in common with each of the golf clubs 1 shown in Figures 5(A), (B), and (C) except that each of the golf clubs 1 has a flat hosel 4B as the hosel 4. That is, in each of the golf clubs 1 shown in Figures 6(A), (B), and (C), one end of a vibration transmission member 20 disposed inside a shaft cavity 9 and a grip cavity 10 is fixed to the flat hosel 4B via a fixing device 22.

[0035] 7A and 7B show an example of the configuration of a golf club 1 in which the interior of a crank-shaped hosel 4A (hosel 4) is formed hollow. In Figures 7A and 7B, a hosel cavity 8 (third cavity) is provided inside the hosel 4. The hosel 4 shown in Figure 7A has the hosel cavity 8 formed to communicate between the upper end 4U and the lower end 4D. In this case, the hosel cavity 8 has a crank shape with two bent portions corresponding to the two bent portions 4F, 4R of the crank-shaped hosel 4A.

[0036] On the other hand, the hosel 4 shown in Fig. 7(B) has a hosel cavity 8 in a portion of the hose 4 located on the shaft 5 side (upper side), and the rest of the hosel 4 except for the portion on the shaft 5 side (upper side) is solid. Specifically, the hosel 4 shown in Fig. 7(B) has the hosel cavity 8 extending from the upper end 4U to the first bent portion 4F, and the portion located closer to the head 3 than the first bent portion 4F, i.e., the portion including the second bent portion 4R and the lower end 4D, is solid. In this case, the hosel cavity 8 is formed linearly from the upper end 4U to the first bent portion 4F.

[0037] 7A and 7B, one end of the vibration transmission member 20 disposed inside the shaft cavity 9 and the grip cavity 10 is fixed to the hosel 4 via a fastener 22. Figures 7A and 7B illustrate an example in which one end of the vibration transmission member 20 is fixed to the inner circumferential surface of the hosel cavity 8 via the fastener 22. Specifically, the fastener 22 is disposed at the first bend 4F on a surface 8A of the inner circumferential surface of the hosel cavity 8 that faces the upper end 4U. In this case, one end of the vibration transmission member 20 is fixed within the hosel cavity 8 below the upper end 4U of the hosel 4.

[0038] 5(A) to (C), 6(A) to (C), 7(A) and (B) described above, vibrations generated on the striking surface of the head 3 are transmitted not only to the grip 6 via the hosel 4 and shaft 5, but also to the grip 6 via the hosel 4 and vibration transmission member 20. In this way, by incorporating the vibration transmission member 20 into the shaft 5 and grip 6, the vibration transmission paths can be increased, and vibrations generated on the striking surface of the head 3 can be efficiently transmitted to the grip 6 without attenuation. Therefore, a good hitting feel can be provided to the user, and the hitting feel can be improved compared to existing golf clubs.

[0039] 8A and 8B show modified versions of the golf club 1 shown in FIGS. 7A and 7B, with a different mounting structure for the lower end (one end) of the vibration transmission member 20 than in FIGS. 7A and 7B. In the crank-shaped hosel 4A (hosel 4) of the golf club 1 shown in FIGS. 8A and 8B, a hole 8B is provided at the first bend 4F on the inner circumferential surface of the hosel cavity 8, on a surface 8A facing the upper end 4U, connecting the hosel cavity 8 to the outside. The hole 8B is an attachment hole for the vibration transmission member 20. Specifically, the vibration transmission member 20 is inserted into the hosel cavity 8 from the outside of the hosel 4 through the hole 8B. The lower end 20D of the vibration transmission member 20 is formed wider than the diameter of the hole 8B, so that the lower end 20D of the vibration transmission member 20 is engaged and attached outside the hole 8B.

[0040] In each of the golf clubs 1 shown in Figures 5(A) to (C), 6(A) to (C), 7(A), (B), 8(A), and (B), the grip-internal plate 23 and the grip-internal fixture 24 (mounting member) provided at the other end (upper end in the figures) of the vibration transmission member 20 may be configured so that their positions in the extension direction of the grip 6 are adjustable. In this case, by adjusting the positions of the grip-internal plate 23 and the grip-internal fixture 24 (mounting member) in the extension direction of the grip 6, the tension of the vibration transmission member 20 can be adjusted, and vibrations can be efficiently transmitted to the grip 6. Furthermore, the grip-internal plate 23 may be formed in a membrane shape that extends in a direction intersecting the extension direction of the grip 6 (for example, a direction perpendicular to the extension direction of the grip 6). By forming the grip-internal plate 23 in a membrane shape, the grip-internal plate 23 can be subjected to planar vibration (membrane vibration), thereby improving vibration transmission efficiency.

[0041] 9A and 9B show modified examples of the golf club 1 shown in the above-described golf clubs 1, in which the attachment structure of the upper end (other end) of the vibration transmission member 20 is different. In the golf club 1 shown in Fig. 9A, the other end (upper end in the figure) of the vibration transmission member 20 is attached to the inner circumferential surface of the grip 6 via a grip upper end plate 21 and a grip inner fixing device 24 (attachment member).

[0042] <Example of Winding Device> In the golf club 1 shown in FIG. 9(B), a motor 43 and a winding device 44 are provided at the other end (upper end in the figure) of the vibration transmission member 20. The motor 43 and the winding device 44 are mechanisms for adjusting the position of the other end of the vibration transmission member 20 in the extension direction of the grip 6. Here, the vibration transmission member 20 is formed of a windable member, and specifically, is composed of any of a wire, a string, a linear elastic member, and a long coil spring. FIG. 9(C) is a cross-sectional view of the golf club 1 taken along line X1-X1 in FIG. 9(B). As shown in FIG. 9(C), the winding device 44 is formed of a rod-shaped body extending along the cross section of the grip 6, and the motor 43 is connected to one end of the rod-shaped body.

[0043] As shown in FIG. 9B , a pinion 42 is rotatably attached to the motor 43. A rack 41 that meshes with the pinion 42 is fixed to the inner circumferential surface of the grip cavity 10. The pinion 42 is biased upward relative to the rack 41 by a biasing member (e.g., a spring or rubber) (not shown). Rotating the motor 43 and winding the other end of the vibration transmission member 20 with a winding device 44 moves the pinion 42 downward along the rack 41. Unwinding the motor 43 moves the pinion 42 upward along the rack 41. This configuration allows the position to which vibration is transmitted to be easily adjusted in the extension direction of the grip 6, thereby efficiently transmitting vibration to the grip 6.

[0044] Note that a manually operated winding device 44 may be used instead of the motor 43. The winding device 44 may be configured to be rotated externally using a tool such as a Phillips head screwdriver or a flat-head screwdriver. In this case, manually rotating the winding device 44 to wind the other end of the vibration transmission member 20 moves the pinion 42 downward along the rack 41. Similarly, rewinding the winding device 44 in the reverse direction moves the pinion 42 upward along the rack 41. This configuration allows the vibration transmission position to be easily manually adjusted in the extension direction of the grip 6, thereby efficiently transmitting vibrations to the grip 6. Alternatively, the rack and pinion may be omitted from the golf club 1 of FIG. 9(B), and a mechanism for adjusting the tension of the vibration transmission member 20 by winding / releasing the other end of the vibration transmission member 20 using the motor 43 and the winding device 44 may be formed.

[0045] The golf club 1 shown in Figure 10(A) is a modified version of the golf club 1 shown in Figure 9(B) and includes an adjustment mechanism 44A (shown by a dashed line in the figure) that adjusts the position of the vibration transmission member 20 along a transverse direction that intersects with the extension direction of the grip 6. The transverse direction adjustment mechanism 44A is built into the winding device 44 and includes, for example, a rack along the transverse direction, a pinion meshed with the rack, and a motor that rotates the pinion. In this case, in addition to adjusting the position of the other end of the vibration transmission member 20 along the up-down direction indicated by arrow AX in the figure, the position of the other end of the vibration transmission member 20 can also be adjusted along the transverse direction indicated by arrow CX in the figure.

[0046] <Example of Providing Multiple Vibration Transmission Members> The golf club 1 shown in FIG. 10(B) is another modified example of the golf club 1 shown in FIG. 9(B). In this golf club 1, two (or more) vibration transmission members 20, 20' are provided in parallel with one set of rack 41, pinion 42, motor 43, and winding device 44. The other ends (upper ends in the figure) of the two vibration transmission members 20, 20' are each attached in parallel to one winding device 44. One end (lower end, not shown) of each of the two vibration transmission members 20, 20' is attached to a fixture 22 (see, for example, FIG. 5(A)). In this case, one fixture 22 (see, for example, FIG. 5(A)) may be provided corresponding to each of the lower ends of the two (or more) vibration transmission members 20, 20'. By providing two (or more) vibration transmission members 20, 20', vibrations are more efficiently transmitted to the shaft 5 and grip 6, allowing the user to experience accurate and sensitive vibrations.

[0047] <Example of Arranging Multiple Winding Devices in Parallel> The golf club 1 shown in Figures 11(A) and (B) is a modified example of the golf club 1 shown in Figure 10(B), and has two (multiple) sets of racks 41, 41', pinions 42, 42', motors 43, 43', and winding devices 44, 44' corresponding to two (multiple) vibration transmission members 20, 20'. Figure 11(B) is a cross-sectional view of the golf club 1 taken along line X2-X2 in Figure 11(A). As shown in Figure 11(B), the winding devices 44, 44' are arranged in a parallel orientation.

[0048] <Example of Intersecting Arrangement of Multiple Winding Devices> The golf club 1 shown in Figures 12(A) and 12(B) is a modified version of the golf club 1 shown in Figures 11(A) and 11(B), and the arrangement of the two sets of racks 41, 41', pinions 42, 42', motors 43, 43', and winding devices 44, 44' differs from that shown in Figures 11(A) and 11(B). Specifically, as shown in Figures 12(A) and 12(B), the two sets of racks 41, 41', pinions 42, 42', motors 43, 43', and winding devices 44, 44' are arranged so that the winding devices 44, 44' intersect with each other. In this case, the angle at which the winding devices 44, 44' intersect with each other may be manually or electrically adjustable using an adjustment mechanism (not shown). Note that Figure 12(B) is a cross-sectional view of the golf club 1 taken along line X3-X3 in Figure 12(A).

[0049] <Disc-Shaped Mounting Member> The golf club 1 shown in FIG. 13A is a modified example of the mounting structure for two (plural) vibration transmission members 20, 20′. This golf club 1 includes a lower mounting member 27D (hosel-side plate) for mounting one end (lower end in the figure) of each of the two (plural) vibration transmission members 20, 20′, and an upper mounting member 27U (grip-side plate) for mounting the other end (upper end in the figure). The lower mounting member 27D is attached to the upper end 4U of the hosel 4. That is, one end of each of the vibration transmission members 20, 20′ is indirectly fixed to the upper end 4U of the hosel 4 via the lower mounting member 27D. The upper mounting member 27U is fixed to the inner circumferential surface of the grip 6 and serves as a mounting member connecting the upper ends of the vibration transmission members 20, 20′ to the grip 6.

[0050] 13(B) and 13(C) are plan views of the upper mounting member 27U and the lower mounting member 27D, respectively, as viewed from the extension direction of the vibration transmission members 20, 20'. As shown in 13(B) and 13(C), the upper mounting member 27U and the lower mounting member 27D are each formed as a circular plate-like member having a surface that intersects with the extension direction of the vibration transmission members 20, 20'. As shown in 13(A), the upper mounting member 27U and the lower mounting member 27D are each arranged in an orientation where their plate surfaces intersect with the extension direction of the vibration transmission members 20, 20' and are parallel to each other.

[0051] As shown in Figures 13(B) and 13(C), the upper mounting member 27U and the lower mounting member 27D each have a plurality of connecting holes 28U, 28D penetrating from one surface to the other. The plurality of connecting holes 28U, 28D are connecting portions for connecting the ends of the vibration transmission members 20, 20'. One end of the vibration transmission member 20 is connected to one connecting hole 28D in the lower mounting member 27D, and one end of the vibration transmission member 20' is connected to another connecting hole 28D in the lower mounting member 27D. The other end of the vibration transmission member 20 is connected to one connecting hole 28U in the upper mounting member 27U, and the other end of the vibration transmission member 20' is connected to another connecting hole 28U in the upper mounting member 27U.

[0052] In a golf club 1 having an upper mounting member 27U and a lower mounting member 27D, one vibration transmission member 20, 20' can be attached to each of the connecting holes 28U, 28D of the upper mounting member 27U and the lower mounting member 27D. Therefore, a plurality of vibration transmission members 20, 20' can be provided, equal to the number of connecting holes 28U, 28D. Preferably, the connecting holes 28U, 28D to which the vibration transmission members 20, 20' are attached are aligned in a straight line so that the plurality of vibration transmission members 20, 20' are parallel to each other. In this case, the plurality of vibration transmission members 20, 20' are arranged in a forest, which can be said to form a harp-like arrangement.

[0053] The upper mounting member 27U may be attached to the grip upper end plate 21 (grip end). Alternatively, the grip upper end plate 21 itself may function as the upper mounting member 27U, i.e., the grip upper end plate 21 may be provided with a plurality of connecting holes 28U. When the hosel 4 has a hosel cavity 8, the lower mounting member 27D may be attached to the inner peripheral surface of the hosel 4 within the hosel cavity 8. The lower mounting member 27D may also be combined with a reeling device 44. In this case, the lower ends of the vibration transmission members 20, 20′ are attached to the lower mounting member 27D, and the upper ends are attached to the reeling device 44.

[0054] <Modifications of Vibration Transmission Member> Figures 14(A) and (B) are explanatory diagrams of modifications of the vibration transmission member 20. The golf club 1 shown in Figures 14(A) and (B) differs from the golf club 1 shown in Figure 5(A) in the shape of the vibration transmission member 20, but is otherwise the same as the golf club 1 shown in Figure 5(A). The vibration transmission member 20 shown in Figure 14(A) has a wide portion 20A in the middle in the extension direction. The wide portion 20A is a portion formed wider than its upper and lower portions. The wide portion 20A makes it possible to adjust the vibration transmission characteristics of the vibration transmission member 20 and improve the feel on impact.

[0055] 14(B) has a tuning fork shape with its upper portion split into two (U-shaped). In this case, one in-grip fixing device 24 is provided corresponding to each of the upper ends of the bifurcated vibration transmission member 20. By making the vibration transmission member 20 have a tuning fork shape, vibrations of a specific frequency can be emphasized by resonance.

[0056] <Tuning-Fork Shape, Y-Shaped Shape, Ring Shape> Figures 15(A) to 15(G) show examples of various shapes of the vibration transmission member 20. Here, a modified example in which the vibration transmission member 20 is configured as a rod member is described. Note that, among the components of the golf club 1, only the vibration transmission member 20 is shown in Figures 15(A) to 15(G), and other elements are omitted. The vibration transmission member 20 shown in Figure 15(A) has a tuning-fork shape with a bifurcated (U-shaped) lower portion. In other words, it has a shape obtained by inverting the vibration transmission member 20 shown in Figure 14(B) upside down. In this case, one fixing device 22 (e.g., Figure 5(A)) is provided corresponding to each of the bifurcated lower ends of the vibration transmission member 20.

[0057] The vibration transmission members 20 shown in Figures 15(B) and (C) are Y-shaped. The vibration transmission member 20 in Figure 15(B) is Y-shaped with an upper portion bifurcated, while the vibration transmission member 20 in Figure 15(C) is Y-shaped with a lower portion bifurcated. The vibration transmission member 20 shown in Figure 15(D) has a ring-shaped portion in the middle of the extension direction. The vibration transmission member 20 shown in Figure 15(E) is formed in an entire ring shape and differs from the vibration transmission member 20 shown in Figure 15(D) in that it does not have line portions on either the top or bottom. The vibration transmission members 20 shown in Figures 15(F) and (G) are modified versions of the tuning-fork-type vibration transmission member 20 shown in Figures 14(B) and 15(A), and are formed in a U-shape overall.

[0058] According to each of the vibration transmission members 20 shown in Figures 15(A) to 15(G), the vibration transmission characteristics of the vibration transmission member 20 can be adjusted or the vibration can be emphasized depending on the shape, thereby providing the user with a better hitting feel. The shapes of the vibration transmission members 20 shown in Figures 15(A) to 15(G) are merely examples and are not limited to those shown. For example, the entire vibration transmission member 20 may be formed in a V-shape. Furthermore, the upper or lower portion of the vibration transmission member 20 may be branched into three or more branches.

[0059] <Wire, String> The golf club 1 shown in Figures 16(A) and (B) exemplifies a case in which the vibration transmission member 20 is composed of a wire or a string. The wire is, for example, a steel wire or a piano wire. The string includes various types of string-like bodies, such as a string made by weaving various fibers, a wide webbing, a mesh webbing, or a membrane-like webbing. In the vibration transmission member 20 shown in Figure 16(A), the lower end of the single wire or string that constitutes the vibration transmission member 20 is fixed to a fixture 22, and the upper end thereof is fixed to an in-grip fixture 24.

[0060] <Wire, String Feet + Sounding Body> The vibration transmission member 20 shown in FIG. 16(B) has multiple sounding bodies 20S attached along the extending direction of the wire or string. Each sounding body 20S is an object that produces sound in response to vibration of the vibration transmission member 20. Examples of the sounding bodies 20S include bells, beads, pieces of wood, pieces of metal, and vibrating plates. When multiple sounding bodies 20S are attached to the vibration transmission member 20 as shown in FIG. 16(B), sounds emitted from the sounding bodies 20S can be transmitted to the user in addition to vibrations. Note that structures that produce sound using a vibration transmission member 20 made of a wire or string are not limited to structures that use sounding bodies 20S. Possible structures include structures (such as a mukkuri or a mouth harp) in which sounds generated by the vibration of the vibration transmission member 20 resonate within the shaft cavity 9 and the grip cavity 10.

[0061] The golf club 1 shown in Figure 16(C) is an example in which the vibration transmission member 20 is configured as a chain. Here, a chain is a chain member in which annular parts are linearly connected. The annular parts that make up the chain may have any known shape or connection form. Examples of the type (shape) of the chain include various shapes such as chain-like, armor-like, snake-like, and scale-like.

[0062] <Coil Spring> The golf club 1 shown in Figure 16(D) illustrates an example in which the vibration transmission member 20 is configured as a long coil spring. In this case, the lower end of the coil spring constituting the vibration transmission member 20 is fixed to the fixture 22, and the upper end is fixed to the grip-in-fixture 24. The coil spring constituting the vibration transmission member 20 may be disposed so that its outer periphery is in contact with the inner periphery of the shaft hollow portion 9, as shown in Figure 16(E), or so that its outer periphery is spaced apart from the inner periphery of the shaft hollow portion 9, as shown in Figure 16(F).

[0063] <Combination of Multiple Types of Members> The vibration transmission member 20 may be formed from any combination (a structure formed by combining multiple members) of a wire, a string, a rod member, a linear elastic member, or a long coil spring. For example, the vibration transmission member 20 shown in Fig. 17(A) is formed by connecting coil springs 20C to both the top and bottom of a rod member 20R. The tuning-fork type vibration transmission member 20 shown in Fig. 17(B) is attached to a fixture 22 and an in-grip fixture 24 via a wire 20W. When the vibration transmission member 20 is formed from a structure formed by combining multiple members, the length ratio between the respective members is free.

[0064] <Openings, Inspection Window with Cover> The golf club 1 shown in Figures 18(A) to (D) is an example in which the golf club 1 has openings that connect the internal spaces of the cavities 8, 9, and 10 to the outside. The golf club 1 shown in Figure 18(A) is a modified version of the golf club 1 shown in Figure 7(A). The crank-shaped hosel 4A (hosel 4) of this golf club 1 has two openings 80A and 80B that connect the internal space of the hosel cavity 8 to the outside. The openings 80A and 80B are located in different positions. The opening 80A is located between the upper end 4U and the first bent portion 4F. The opening 80B is located between the second bent portion 4R and the lower end 4D.

[0065] The openings 80A, 80B can be closed with lids 81A, 81B, respectively. Each of the openings 80A, 80B can be considered a covered inspection window for visually checking the state inside the hosel cavity 8 (hosel 4) from the outside. During normal use other than inspection, the user closes the openings 80A, 80B with the lids 81A, 81B, and removes the lids 81A, 81B to open the openings 80A, 80B when inspecting the inside. Items that can be checked include, for example, the installation state of the vibration transmission member 20.

[0066] Furthermore, the openings 80A and 80B allow reverberation generated within the hosel cavity 8 (hosel 4) when the head 3 hits a ball to be transmitted to the outside of the hosel 4. This makes it possible to increase the volume of the sound that reaches the user's ear when the head 3 hits a ball, further improving the feel on impact. In other words, the openings 80A and 80B, which form inspection windows, also serve as openings for transmitting reverberation within the hosel 4 to the outside. Note that while the golf club 1 in FIG. 18(A) has two openings 80A and 80B as an example, the hosel 4 may have one or more openings, and the openings may be located at any desired locations.

[0067] The shaft 5 of the golf club 1 shown in Figure 18(B) has an opening 90 that connects the internal space of the shaft cavity 9 to the outside. The grip 6 of the golf club 1 shown in Figure 18(C) has an opening 92 that connects the internal space of the grip cavity 10 to the outside. In Figures 18(B) and 18(C), the openings 90 and 92 function as covered inspection windows that can be closed with covers 91 and 93. During normal use other than inspection, the user closes the openings 90 and 92 with the covers 91 and 93, and removes the covers 91 and 93 to open the openings 90 and 92 when inspecting the interior of the shaft 5 or the grip 6. These openings 90 and 92 also serve as openings for transmitting reverberant sounds from the inside of the shaft 5 or the grip 6 to the outside.

[0068] The golf club 1 shown in Figure 18(D) is a modified version of the golf club 1 shown in Figure 1(B). The hosel 4B (hosel 4) of this golf club 1, which is formed in a rectangular, flat plate shape, has a hosel cavity 8 therein and is provided with an opening 80 that connects the internal space of the hosel cavity 8 to the outside. The opening 80 functions as a covered inspection window that can be closed with a lid 81, and also serves as an opening for transmitting reverberation within the hosel 4 to the outside. In this case, the fixture 22 that secures the lower end of the vibration transmission member 20 is attached to a fixing plate 22A attached inside the hosel cavity 8.

[0069] <Trapezoidal Hosel> The golf club 1 in Figures 19(A) to 19(E) are modified examples of the shape of the hosel 4. In the golf club 1 shown in Figure 19(A), the hosel 4 is formed by combining a trapezoidal portion 4X that forms a trapezoidal (or substantially triangular) shape when viewed from the front and a crank-shaped portion 4Y that extends upward from the upper part of the trapezoidal portion 4X. The crank-shaped portion 4Y has two bends in the middle of its extension. In this case, the head 3 is provided below the trapezoidal portion 4X, and the shaft 5 is provided above the crank-shaped portion 4Y. Note that, as an example of a connection between the crank-shaped portion 4Y (hosel 4) and the shaft 5, one end (the lower end in the figure) of the shaft 5 is inserted into the upper end of the crank-shaped portion 4Y (hosel 4). However, the connection between the hosel 4 and the shaft 5 is not limited to this and may be any of the connection modes illustrated in Figures 5(A) to 5(C), for example.

[0070] The golf clubs 1 shown in Figures 19(B) to 19(E) differ from one another in the detailed configuration of the hosel 4 of the golf club 1 shown in Figure 19(A). Figures 19(B) to 19(E) show cross-sectional views of each golf club 1. In the golf club 1 shown in Figure 19(B), both the trapezoidal portion 4X and the crank-shaped portion 4Y that form the hosel 4 are made of solid material with solid cross-sections. The lower end of the vibration transmission member 20 is fixed to the upper end of the crank-shaped portion 4Y via a fixing device 22.

[0071] The golf club 1 shown in Figure 19(C) differs from the golf club 1 shown in Figure 19(B) in that a hosel cavity 8 is provided in part of the crank-shaped portion 4Y. That is, the hosel cavity 8 is provided in part of the upper end of the crank-shaped portion 4Y, and the rest of the crank-shaped portion 4Y except for the part where the hosel cavity 8 is provided is made of a solid material with a solid cross-section. In this case, the lower end of the vibration transmission member 20 is fixed to the inner circumferential surface of the hosel cavity 8 via a fixing device 22.

[0072] The golf club 1 shown in Figure 19(D) differs from the golf club 1 shown in Figure 19(C) in that a hosel cavity 8 is provided over the entire length of the crank-shaped portion 4Y. In this case, the hosel cavity 8 is formed to communicate with the upper and lower ends of the crank-shaped portion 4Y. The lower end of the vibration transmission member 20 is fixed to the inner circumferential surface of the hosel cavity 8 via a fixing device 22.

[0073] The golf club 1 shown in Figure 19(E) differs from the golf club 1 shown in Figure 19(D) in that a hosel cavity 8 is provided in both the trapezoidal portion 4X and the crank-shaped portion 4Y that form the hosel 4. The lower end of the vibration transmission member 20 is fixed to the inner peripheral surface of the hosel cavity 8 via a fastener 22. Note that, in the golf club 1 shown in Figure 19(E), the hosel cavity 8 is formed so as to communicate between the cavity in the trapezoidal portion 4X and the cavity in the crank-shaped portion 4Y, but the cavity in the trapezoidal portion 4X and the cavity in the crank-shaped portion 4Y may be separated and not communicate with each other.

[0074] <Example of a Bent Vibration Transmission Member> The golf clubs 1 shown in Figures 20(A) to (E) are modified examples of the configuration of the vibration transmission member 20. Each of the golf clubs 1 shown in Figures 20(A) to (C) has a crank-shaped hosel 4A similar to that shown in Figure 7(A), but the vibration transmission member 20 is different from that shown in Figure 7(A). In the golf club 1 shown in Figure 20(A), the vibration transmission member 20 has one bending point 29 and is bent at one point. In this case, the first vibration transmission member 20X, which is the portion of the vibration transmission member 20 that extends upward from the bending point 29, extends in the vertical direction. On the other hand, the second vibration transmission member 20Y, which is the portion of the vibration transmission member 20 that extends rearward from the bending point 29, extends in the front-to-rear direction. In this vibration transmission member 20, the first vibration transmission member 20X and the second vibration transmission member 20Y are configured as rod members.

[0075] The golf club 1 in FIG. 20(B) differs from the golf club 1 in FIG. 20(B) in that the vibration transmission member 20 has a second vibration transmission member 20Y extending rearward from the bending point 29 and configured as a long coil spring. The golf club 1 in FIG. 20(C) has an auxiliary vibration transmission member 20Z mounted within the hosel cavity 8, and the vibration transmission member 20 is attached to this auxiliary vibration transmission member 20Z via a connecting portion 20K. The auxiliary vibration transmission member 20Z is disposed in the hosel cavity 8 within the crank-shaped hosel 4A in an orientation extending in the front-to-rear direction, and both ends of the auxiliary vibration transmission member 20Z are fixed to the inner circumferential surface of the hosel cavity 8 via fasteners. One end (the lower end in the figure) of the vibration transmission member 20 is attached to this auxiliary vibration transmission member 20Z. In other words, it can be said that the vibration transmission member 20 is indirectly fixed to the hosel 4 via the auxiliary vibration transmission member 20Z. In each of the golf clubs 1 shown in Figures 20(A) to (C), vibrations from the striking surface 2 are transmitted from the hosel 4 through the vibration transmission member 20 to the grip 6, providing the user with a good feel on impact and improving the feel on impact compared to existing golf clubs. The auxiliary vibration transmission member 20Z shown in Figure 20(C) may also be attached to a hosel cavity 8 provided inside a flat hosel 4B (hosel 4) as shown in Figure 18(D). In this case, too, the user can be provided with a good feel on impact and improving the feel on impact compared to existing golf clubs.

[0076] The golf club 1 shown in Figures 20(D) and (E) has a hosel 4 that combines a trapezoidal portion 4X and a crank-shaped portion 4Y similar to that shown in Figure 19(D), and differs from Figure 19(D) in that a hosel cavity 8 is provided within the crank-shaped portion 4Y and across an upper portion (part) of the trapezoidal portion 4X. In Figure 20(D), the vibration transmission member 20 has two bending points 29 and is bent at two locations along the bending shape of the hosel cavity 8.

[0077] 20(E), the vibration transmission member 20 is configured by combining a rod member 20R and a coil spring 20C. More specifically, the rod member 20R is disposed in the grip cavity (not shown) and the shaft cavity 9, and the coil spring 20C is disposed in the hosel cavity 8. The upper end of the coil spring 20C is connected to the lower end of the rod member 20R, and the lower end of the coil spring 20C is fixed to the upper part of the trapezoidal portion 4X. The coil spring 20C is disposed in the hosel cavity 8 in a shape that is bent at two points along the bent shape of the crank-shaped portion 4Y.

[0078] <Head Cavity> The golf club 1 shown in FIG. 21 has a hollow head cavity (fourth cavity) 7 formed inside the head 3, but the rest of the configuration is the same as the golf club 1 shown in FIG. 7(A). The head cavity 7 in the head 3 converts vibrations from the striking surface 2 into air vibrations within the cavity. This allows vibrations generated at the striking surface 2 of the head 3 to be transmitted to the grip 6 via the hosel 4 and vibration transmission member 20, providing the user with a good feel on impact. The vibrations from the striking surface 2 can be transmitted to the user not only physically but also acoustically. This allows the user to hear the vibrations from the striking surface as sound, improving the feel on impact. Furthermore, in the golf club 1 shown in FIG. 21, the head cavity 7, hosel cavity 8, shaft cavity 9, and grip cavity 10 are all connected to form a single cavity, so the sound generated by the vibrations from the striking surface can be transmitted to the user more clearly.

[0079] <Weight Member> Figures 22A and 22B are perspective views illustrating modified examples of the head 3. As shown in these figures, the head 3 may incorporate a weight member 61 for changing the center of gravity of the head 3. In this case, the center of gravity may be changed by making the attachment state (position and angle) of the weight member 61 adjustable. The attachment state of the weight member 61 may be manually adjustable by the user, or a weight motor 62 (drive source) for moving the weight member 61 may be provided. A golf club 1 incorporating the weight member 61 includes a head 3, a hosel 4, a shaft 5, and a grip. The grip 6 is integrally formed with the shaft 5. A vibration transmission member 20 is incorporated in a shaft cavity 9 within the shaft 5 and a grip cavity 10 within the grip 6. The lower end of the vibration transmission member 20 is fixed to the hosel 4. Attachment members (an inner grip plate 23 and an inner grip fixture 24) are provided within the grip cavity 10 to connect the upper end of the vibration transmission member 20 to the grip 6.

[0080] 22A is a perspective view showing two sets of weight members 61 and a weight motor 62 built into the top surface of the head 3. The weight members 61 are made of a material with a different density from the material constituting the head 3 and are provided inside a hollow cylindrical recess formed in the top surface of the head 3. The weight motor 62 moves the weight members 61 in the rotational direction along the inner circumferential surface of the recess, thereby changing the position of each weight member 61. With this configuration, the position of the weight members 61 can be easily changed to move the center of gravity of the head 3, providing a good feel on impact.

[0081] 22(B) is a perspective view showing a configuration in which weight members 61 are provided inside linear recesses formed in the top surface of the head 3. A weight motor 62 changes the position of each weight member 61 by sliding the weight members 61 along the inner circumferential surface of the recesses. Even with this configuration, the position of the weight members 61 can be easily changed to move the center of gravity of the head 3, providing a good feel on impact.

[0082] <Vibration Sensor> As a modification of the golf club 1 described above, various electrical devices, sensors, a control device (controller), a battery, etc. may be built into the hosel 4. FIG. 23 is a perspective view of the golf club 1 according to this modification. The basic configuration of the golf club 1 shown in FIG. 23 is the same as that of the golf club 1 shown in FIG. 1B . The golf club 1 shown in FIG. 23 includes a head 3, a hosel 4, a shaft 5, and a grip. The grip 6 is integrally formed with the shaft 5. A vibration transmission member 20 is built into a shaft cavity 9 in the shaft 5 and a grip cavity 10 in the grip 6. The lower end of the vibration transmission member 20 is fixed to the hosel 4. The grip cavity 10 includes mounting members (a grip inner plate 23 and a grip inner fixture 24) that connect the upper end of the vibration transmission member 20 to the grip 6. As shown in FIG. 23 , the golf club 1 may include a vibration sensor 95 built into the hosel 4 to detect vibrations transmitted from the hosel 4 to the vibration transmission member 20. The vibration sensor 95 may be attached to the outer surface of the hosel 4 or built into the hosel 4. If a hosel cavity 8 is formed inside the hosel 4, a vibration sensor 95 may be disposed inside it. By detecting vibrations with the vibration sensor 95, the magnitude and waveform of vibrations near the vibration source (striking surface 2) can be objectively determined, further improving the feel on impact. In addition, the magnitude and waveform of vibrations can be analyzed, and the analysis results can be used to improve the effectiveness of golf practice.

[0083] Furthermore, a vibration device 96 (actuator) that vibrates based on information about vibrations detected by the vibration sensor 95 may be built into the hosel 4. When a hosel cavity 8 is formed inside the hosel 4, the vibration device 96 may be disposed inside the hosel cavity 8. The vibration device 96 may function to directly amplify and output the vibrations detected by the vibration sensor 95, for example. By amplifying the vibrations with the vibration device 96, it is possible to increase the vibrations that are actually transmitted to the user, further improving the feel when hitting the ball.

[0084] Furthermore, a speaker 96A that emits sound based on vibration information detected by the vibration sensor 95 may be built into the hosel 4. If a hosel cavity 8 is formed inside the hosel 4, a speaker 96A including an amplifier may be disposed inside the hosel cavity 8. The speaker 96A may function, for example, to amplify and output the vibrations detected by the vibration sensor 95 as sound. As a result, when a golf ball is hit with one of the striking surfaces of the golf club, the vibrations are detected by the vibration sensor 95 and are output as sound from the speaker 96A. In this case, the hollow hosel 4, shaft 5, and grip 6 function as a speaker box, amplifying and outputting the sound related to the vibrations. As a result, the golf club 1 can function as a kind of electronic musical instrument.

[0085] 23 , another vibration device 97 (actuator) and speaker 97A may be built into the grip 6. The vibration device 97 and speaker 97A are disposed, for example, inside the grip cavity 10 in the grip 6. Like the vibration device 96 and speaker 96A described above, the vibration device 97 and speaker 97A function to directly amplify and output the vibrations detected by the vibration sensor 95, or to directly amplify and output the vibrations detected by the vibration sensor 95 as sound. By generating vibrations or outputting sound within the grip 6, the vibrations and sound actually transmitted to the user can be made even larger, further improving the feel of the impact.

[0086] <Transmitter> The golf club 1 may further include a transmitter 101 for transmitting information detected by the vibration sensor 95 to an external device. The transmitter 101 is built into, for example, the hosel 4. If a hosel cavity 8 is formed inside the hosel 4, the transmitter 101 may be disposed inside the hosel cavity 8. The information detected by the vibration sensor 95 may be transmitted to an external device such as a computer (not shown) via the transmitter 101, for example, by wireless or wired connection.

[0087] <Rhythm Box Function> The golf club 1 may include a controller 100 having a rhythm box function that provides rhythm when the golf ball is hit and a synthetic voice generation function. The controller 100 is built into, for example, the hosel 4. If a hosel cavity 8 is formed inside the hosel 4, the controller 100 may be disposed inside the hosel cavity 8. A speaker 96A is connected to the output side of the controller 100. By using either the rhythm box function or the synthetic voice generation function of the controller 100, one of the rhythm sound generated by the controller 100 and the synthetic voice can be output from the speaker 96A when the golf ball is hit. Note that various operations such as turning the rhythm box function and the synthetic voice generation function of the controller 100 on and off, adjusting the volume, and so on can be input from an indicator (not shown). The indicator may be built into the golf club 1. Alternatively, the indicator may be configured by an external device (e.g., a smartphone) connected via a wireless connection. Furthermore, various functions of the controller 100 may be configured by an external device (e.g., a smartphone) connected via a wireless connection.

[0088] The golf club 1 shown in FIG. 24 is a modified example of the golf club 1 shown in FIG. 23 . The vibration sensor 95, vibration device 96, speaker 96A, transmitter 101, and controller 100 built into the hosel 4 of the golf club 1 shown in FIG. 23 may be built into the shaft 5. FIG. 24 illustrates an example of a configuration in which a vibration sensor 95′, vibration device 96′, and speaker 96A′ are further built into the shaft 5 of the golf club 1 shown in FIG. 23 . This is not a limitation, and all of the vibration sensor, vibration device, speaker, transmitter, and controller may be built into the shaft 5. That is, the vibration sensor, vibration device, speaker, transmitter, and controller may be built into only one of the hosel 4 and the shaft 5, or both. Furthermore, some of the vibration sensor, vibration device, speaker, transmitter, and controller may be built into one of the hosel 4 and the shaft 5, and the rest may be built into the other of the hosel 4 and the shaft 5 (distributed or combined).

[0089] Furthermore, each golf club 1 shown in FIGS. 23 and 24 may be provided with a liquid crystal display 102 (display device, electric display member) (display function). The liquid crystal display 102 is disposed, for example, on the upward surface of the head 3 and connected to the output side of the controller 100. In this case, the liquid crystal display 102 can display the vibration data detected by the vibration sensors 95, 95' as numerical values, graphs, etc. The liquid crystal display 102 may also display the launch direction of the golf ball. In this case, the controller 100 controls the indicator (see reference numeral 103 in FIG. 33 ) to send an instruction signal for displaying the launch direction of the golf ball to the liquid crystal display 102, thereby controlling the liquid crystal display 102 to display the launch direction of the golf ball. The indicator 103 (FIG. 33 ) is an input means for inputting an instruction for the launch direction of the golf ball.

[0090] The display on the LCD display 102 may be an arrow indicating the direction of launch of the golf ball, or a series of multiple circles. In this case, the circles may become smaller as they approach the tip indicating the direction. This configuration not only improves the feel of the shot, but also allows the LCD display 102 to freely display the direction of launch of the golf ball, improving convenience. The indicator 103 and the controller 100 can also be substituted with a smartphone. In this case, it is preferable to use a wireless line for connecting the controller 100 and the LCD display 102. The instructions input to the indicator 103 may be input by, for example, the user of the golf club 1, a trainer, or an assistant (caddie).

[0091] In each golf club 1 shown in Figures 23 and 24, the mounting positions of the vibration sensor 95, vibration device 96, speaker 96A, transmitter 101, controller 100, vibration sensor 95', vibration device 96', speaker 96A', LCD display 102, vibration device 97, and speaker 97A are not limited to the examples shown in the figures, and may be any positions on the golf club 1.

[0092] <Adapter> Figures 25(A) and (B) are side views illustrating yet another modification of the golf club 1 described above. While Figures 25(A) and (B) illustrate a golf club 1 having a crank-shaped hosel 4A (hosel A) as shown in Figure 1(A), the shape of the hosel 4 is not limited to this. One of a plurality of adapters 3A, 3B is detachably attached to the underside of the head 3 of the golf club 1. These adapters 3A, 3B are available in multiple types, differing in shape, mass, center of gravity, etc. For example, the adapter 3A shown in Figure 25(B) is used when it is desired to increase the lie angle L compared to the adapter 3B shown in Figure 25(A).

[0093] It is assumed that the user of the golf club 1 or an instructor (trainer) will select one of the adapters 3A, 3B and attach it to the underside of the head 3. The adapters 3A, 3B are preferably attached to the underside of the head 3 via an easily detachable locking structure (clip) or fastening structure (screw). Using the adapter 3A, 3B that is appropriate for the physique and hitting form of the user of the golf club 1 makes it easier to optimize the swing trajectory of the golf club 1, thereby improving the effectiveness of practice. The lie angle L refers to the angle of the shaft 5 relative to the horizontal plane when the striking surface 2 of the head 3 is viewed horizontally from the front. The examples of Figures 25(A) and 25(B) can be applied to any of the golf clubs 1 described above. In that case, the configuration other than the adapters 3A, 3B and their attachment method is the same as that of each of the embodiments and various modifications.

[0094] [2. Effects] (1) The golf club 1 of the present invention includes a head 3, a shaft 5, a hosel 4, and a grip 6. The head 3 has a striking surface 2 that strikes a golf ball. The shaft 5 is formed in an axial shape. The grip 6 is provided at the other end of the shaft 5 and is held by a user. The shaft 5 has a hollow shaft cavity 9 (first cavity) therein, and the grip 6 has a hollow grip cavity 10 (second cavity) therein that communicates with the shaft cavity 9 (first cavity). A vibration transmission member 20 is housed in the shaft cavity 9 (first cavity) and the grip cavity 10 (second cavity). The vibration transmission member 20 is formed in an elongated shape, one end of which is fixed to the hosel 4, and the other end of which is fixed to a grip inner plate 23 and a grip inner fixture 24 (mounting member) provided inside the grip cavity 10 (second cavity). The vibration transmission member 20 transmits vibrations generated on the striking surface 2 to the grip 6. By incorporating the vibration transmission member 20 into the shaft 5 and the grip 6 in this way, vibrations generated on the striking surface 2 of the head 3 can be efficiently transmitted to the grip 6 without attenuation, improving the feel on impact. Furthermore, the shaft cavity 9 and the grip cavity 10 can resonate the vibrations, increasing the sound heard by the user. This further improves the feel and sound on impact.

[0095] (2) Furthermore, when the hosel 4 of the present invention is formed from a solid material having a rectangular, flat, and solid cross-section, as shown in FIG. 1B, for example, by extending a planar, flat hosel 4B (hosel 4) with a constant thickness parallel to the striking surface 2, vibrations from the striking surface 2 are converted into surface vibrations (membrane vibrations) of the hosel 4. This allows the vibrations to be efficiently transmitted to the vibration transmission member 20, allowing the user to feel the vibrations accurately and delicately. (3) When the hosel 4 of the present invention is formed from a solid material having two bends in the middle and a solid cross-section, as shown in FIG. 1A, for example, the vibrations from the striking surface 2 are transmitted to the vibration transmission member 20 via the crank-shaped hosel 4A (hosel 4). Therefore, the crank shape improves vibration transmission efficiency, and vibrations generated at the striking surface 2 of the head 3 can be efficiently transmitted to the grip 6 without attenuation, resulting in an improved feel on impact.

[0096] (4) and (5) The hosel 4 of the present invention may have a hollow hosel cavity 8 (third cavity) formed therein. By forming such a hosel cavity 8 inside the hosel 4, sound can be generated in the hosel cavity 8. This allows the user to confirm the vibration of the striking surface 2 as sound, further improving the feel on impact. In this case, the hosel 4 may be crank-shaped with two bends in the middle, or may be rectangular and flat.

[0097] (6) For example, as shown in FIG. 9B, the attachment member (rack 41, pinion 42, motor 43, and winding device 44 in the figure) that connects the other end of the vibration transmission member 20 to the grip 6 may be provided so that its position can be adjusted in the extension direction of the grip 6. With this configuration, the position to which the vibration of the vibration transmission member 20 is transmitted can be adjusted, and the vibration can be transmitted to the grip 6 efficiently. Therefore, the hitting feel can be further improved.

[0098] (7) In the golf club 1 of the present invention, the hosel 4 incorporates a vibration sensor 95 that detects vibrations generated at the striking surface 2. This allows the vibrations to be transmitted by the vibration transmission member 20 and then electrically processed. For example, by amplifying and outputting the vibrations detected by the vibration sensor 95, the user can hear the vibrations of the striking surface 2 as sound, further improving the feel on impact. (8) In the golf club 1 of the present invention, the hosel 4 incorporates a vibration device 96 that vibrates or a speaker 96A that emits sound based on information detected by the vibration sensor. This increases the vibrations and sounds actually transmitted to the user, further improving the feel on impact. (9) Incorporating another vibration device 97 or speaker 97A into the grip 6 increases the vibrations and sounds at the user's hand, further improving the feel on impact.

[0099] (10) The vibration transmission member 20, 20' of the present invention can be constructed of any one of a wire, a string, a rod member, a linear elastic member, or any combination thereof. This allows the vibration transmission member 20, 20' to be realized with a simple configuration, and vibration transmission efficiency can be easily improved. Therefore, the hitting feel can be further improved. (11) Furthermore, the grip inner plate 23 (attachment member) of the present invention can be formed in a membrane shape that extends in a direction intersecting the extension direction of the grip 6. By forming the grip inner plate 23 (attachment member) in a membrane shape, it is possible to generate planar vibration (membrane vibration), thereby improving vibration transmission efficiency. Therefore, the hitting feel can be further improved.

[0100] (12) As shown in FIG. 5A, the vibration transmission member 20, 20' of the present invention may be provided with a mass member 26 that acts as a weight to amplify vibration. By providing the mass member 26, the vibration of the vibration transmission member 20 can be easily amplified or vibration attenuation can be suppressed, thereby improving vibration transmission efficiency. This further improves the feel on impact. (13) and (14) If the hosel 4 of the present invention has a hollow hosel cavity 8 (third cavity) therein, an auxiliary vibration transmission member 20Z that transmits vibrations generated at the striking surface 2 to the vibration transmission member 20 may be provided inside the hosel cavity 8 (third cavity), as shown in FIG. 20C, for example. The auxiliary vibration transmission member 20Z allows vibrations generated at the striking surface 2 to be efficiently transmitted to the vibration transmission member 20 without attenuation, further improving the feel on impact.

[0101] (15) The head 3 of the present invention may have a head cavity 7 (fourth cavity) inside. By forming such a head cavity 7 inside the head 3, vibrations can be reflected in the head cavity 7 as well, increasing the volume of the sound heard by the user. This further improves the feel on impact. (16) As shown in Figures 22(A) and 22(B), a weight member 61 for changing the center of gravity of the head 3 may be applied to the head 3 of the present invention. By changing the attachment position and attachment angle of such a weight member 61, the center of gravity of the head 3 can be easily moved, providing a good feel on impact.

[0102] (17) A weight motor 62 may be provided as a drive source for moving the weight member 61. In this case, the weight member 61 is provided, for example, inside a hollow cylindrical recess formed in the top surface of the head 3. The weight motor 62 also drives the weight member 61 to rotate along the inner circumferential surface of the recess. With this configuration, the center of gravity of the head 3 can be easily adjusted using the weight motor 62. This further improves the feel when hitting the ball.

[0103] (18) As shown in Figures 23 and 24, the golf club 1 of the present invention can be equipped with a controller 100 having a rhythm box function and a synthetic voice generation function that provides rhythm when the golf ball is hit. As a result, when the golf ball is hit, one of the rhythmic sound or the synthetic voice generated by the controller 100 can be output from the speaker 96A, providing assistance in hitting the golf ball to the user of the golf club 1. (19) As shown in Figures 25(A) and (B), the golf club 1 of the present invention has one of multiple adapters 3A, 3B detachably attached to the underside of the head 3. Using an adapter 3A, 3B that is suited to the physique and hitting form of the user of the golf club 1 makes it easier to optimize the swing trajectory of the golf club 1, thereby improving the effectiveness of practice.

[0104] (20) The golf club 1 of the present invention may have a transmitter that transmits signals from the vibration sensor 95 to the outside. This makes it possible to use information (vibration data, vibration information) related to vibrations detected by the vibration sensor 95 in an external device (such as a smartphone, computer, or data server).

[0105] (21) to (26) In the golf club 1 of the present invention, when the hosel 4 has a hosel cavity 8 (third cavity) therein, the hosel cavity 8 may have openings 80, 80A, and 80B that communicate the interior of the hosel cavity 8 with the outside. The openings 80, 80A, and 80B allow reverberation within the hosel cavity 8 to be transmitted to the outside of the hosel 4, thereby amplifying the sound heard by the user, further improving the feel of the impact and allowing the impact sound to be fully confirmed. The openings 80, 80A, and 80B may be closed with covers 81, 81A, and 81B. In this case, by removing the covers 81, 81A, and 81B, the interior of the hosel 4 (e.g., the vibration transmission member 20 within the hosel 4) can be inspected through the openings 80, 80A, and 80B. That is, the openings 80, 80A, and 80B also function as covered inspection windows for inspecting the interior of the hosel 4. It can be said that the inspection window with lid also serves as an opening for transmitting reverberation within the hosel cavity 8 to the outside of the hosel 4. This allows the state inside the hosel 4 to be easily inspected.

[0106] (27) The golf club 1 of the present invention may further have openings 90, 92 that connect the internal space of the shaft hollow portion 9 (first hollow portion) or the internal space of the grip hollow portion 10 (second hollow portion) to the outside, and lids 91, 93 that close the openings 90, 92. In this case, the openings 90, 92 and the lids 91, 93 form covered inspection windows for the vibration transmission member 20 in the shaft 5 or the grip 6. This allows for easy inspection of the state of the vibration transmission member 20 in the shaft 5 or the grip 6.

[0107] (28), (29) In the golf club 1 of the present invention, by providing multiple vibration transmission members 20, 20', the number of vibration transmission media increases, allowing vibrations from the striking surface 2 to be transmitted more efficiently to the grip 6. In this case, the multiple vibration transmission members 20, 20' may be attached together to a single mounting member, or they may be attached individually to corresponding mounting members for each of the multiple vibration transmission members 20, 20'. (30) For example, multiple sets of racks 41, pinions 42, motors 43, and winding devices 44 may be provided as multiple mounting members corresponding to each of the multiple vibration transmission members 20, 20'. In this case, the positions of the multiple vibration transmission members 20, 20' can be individually adjusted in the extension direction of the grip 6, allowing vibrations to be transmitted more efficiently to the grip 6. This further improves the feel on impact. (31), (32) In the golf club 1 of the present invention, the other ends of the multiple vibration transmission members 20, 20' are fixed to an upper mounting member 27U (mounting member, grip-side plate) provided inside the grip cavity 10 (second cavity), and one end is fixed to a lower mounting member 27D (mounting member, hosel-side plate). Each of the upper mounting member 27U and the lower mounting member 27D is disk-shaped and extends along a plane intersecting the extension direction of the vibration transmission members 20, 20', and is provided with multiple connecting holes 28U, 28D that connect the multiple vibration transmission members 20, 20', respectively. In this case, the multiple vibration transmission members 20, 20' can be attached with a simple configuration.

[0108] [3. Other] The above-described examples according to the first embodiment are merely illustrative, and are not intended to exclude various modifications or applications of techniques not explicitly stated in these examples. The configurations of the examples according to the first embodiment can be modified in various ways without departing from the spirit of the invention. Furthermore, they can be selected or combined as needed.

[0109] For example, additional elements such as a vibration sensor, a vibration device, a speaker, a controller (with a rhythm box function or a synthetic voice generation function), a liquid crystal display, a weight member, and an adapter can be applied to any of the above-described golf clubs 1. Also, various vibration transmission members 20 can be applied to any of the above-described golf clubs. Various shapes of the vibration transmission members 20 and various components such as the upper and lower mounting members 27U and 27D, the fixtures 22, the grip-inside fixtures 24, and the winding device 44 can be freely combined.

[0110] Furthermore, although a putter is shown as an example of the golf club 1, it is of course applicable to other golf clubs (woods, hybrids, utilities, etc.) Furthermore, although a battery for a circuit for amplifying the signals detected by the sensor or pickup and outputting them through a speaker is not shown, it can be provided inside or outside the golf club as needed.

[0111] If a smartphone also functions as part of the controller (rhythm box function, synthetic voice generation function), the smartphone battery also serves as the battery for the circuit. Furthermore, the golf club 1 can be manufactured using various methods in addition to or instead of the usual golf club manufacturing methods. For example, it can be manufactured using a 3D printer, a seamless welding method, a casting method, or an appropriate combination of these methods.

[0112] [II. Second Embodiment] [1. System Configuration] Next, a golf practice system to which the golf club 1 (1') is applied will be described. FIG. 26 is an explanatory diagram showing the overall configuration of the golf practice system. This golf practice system S includes a golf practice machine T for putting practice. As is well known, putting in golf is the act of hitting a golf ball with a golf club (typically a "putter") to put it into a hole called a cup (cup-in). Note that the golf practice machine T is not limited to putting practice using a putter, but can also be used for swing practice using golf clubs other than putters, such as drivers and irons.

[0113] The practice machine T is provided with a cup area T1 in which a cup C is provided on the golf ball rolling surface, and a hitting area T2, which is provided away from the cup C and has a golf ball rolling surface and serves as a hitting position for the user. The practice machine T may be, for example, a practice green, in which case the cup C is recessed relative to the golf ball rolling surface of the cup area T1. As another example, the practice machine T may be a golf practice mat. In this case, the cup C is not recessed, but is provided as a predetermined area (flat surface) on the golf ball rolling surface. In addition, in the case of a golf practice mat, the cup C may be formed as a shallow depression on the mat. In other words, the cup C is not limited to a hole, as long as it is a target position for inserting the golf ball into the cup. The following description will focus on the case in which the cup C is a hole recessed relative to the golf ball rolling surface. The training machine T is a facility for a user (golfer) standing in the hitting area T2 to practice putting by using a golf club 1' to hit a ball B toward a cup C provided in the cup area T1. The golf ball rolling surface is the surface on which the hit ball B rolls, and is the floor surface of the cup area T1 and the hitting area T2.

[0114] In this embodiment, the directions used in explaining the golf training system S are defined as follows: Using the user putting in the hitting area T2 as a reference, the direction from the user toward the cup C is "front" (marked "F" in the figure), and the opposite side of "front" is "back" (marked "B" in the figure), and "left" and "right" (marked "L" and "R" in the figure) are defined based on "front." In addition, "up" and "down" (marked "U" and "D" in the figure) are defined based on the direction in which gravity acts.

[0115] 26, a cup C provided in a cup area T1 of a training machine T is positioned forward of a hitting area T2. A pin P made of a rod-shaped member is erected on the cup C. The pin P serves as a marker for the cup C to a user in the hitting area T2.

[0116] The golf practice system S in Figure 26 is provided with a cup unit 200 attached to the cup C, a pin unit 500 attached to the pin P, a club unit 700 attached to the golf club 1', and a photography unit 600 arranged in the hitting area T2.

[0117] In addition to these units 200, 500, 600, and 700, the system S also includes a control unit 300 that manages the system S, and a terminal device 400 owned by the user. The devices 200 to 700 in the system S are connected via a wireless communication network so that they can exchange data, and can operate in cooperation with each other. The wireless communication network is a network that complies with well-known wireless communication standards such as Wi-Fi and Bluetooth (registered trademark).

[0118] The overview of the present system S is that, based on monitor information acquired by the units 200, 500, 600, and 700, the control unit 300 generates guide information for providing guidance to the user's golf play, and the control unit 300 transmits the guide information to the terminal device 400, etc., which then provides guidance based on the guide information to the user in advance (in advance), for example, before the user hits the ball. In other words, the present system S allows the devices 200 to 700 to work together via a network to provide interactive guidance for the user's golf practice. The guidance includes advice on golf play and model plays to the user. Specifically, advice and model plays include hitting form, golf club swing rhythm, ball launch direction, and timing.

[0119] The monitor information acquired by the units 200, 500, 600, and 700 in this system S is the measurement results regarding the user's golf play. The monitor information includes multiple video data, cup-in information, ball hitting information, golf club head angle, etc. The cup unit 200, pin unit 500, club unit 700, and photographing unit 600 are monitor information sources that provide the monitor information to the control unit 300.

[0120] <Cup Unit> The cup unit 200 is built into (attached to) the cup C and is a mechanism provided to provide monitor information on the cup C to the control unit 300. The cup unit 200 includes a first control device (referred to as the "control device" in the figure) 201, a first sensor (first detection means, referred to as the "sensor" in the figure) 202, and a first communication device (first transmission device, referred to as the "communication device" in the figure) 203. The first control device 201 is an electrical control device configured to include a processor, a storage device, etc. that control the cup unit 200.

[0121] A first sensor 202 and a first communication device 203 are connected to the first control device 201 so as to be able to send and receive data. The first sensor 202 is a detection means provided to detect cup-in information indicating that the golf ball B has gone into the cup C. The first sensor 202 is, for example, an impact sensor that detects the impact of the golf ball B falling into the cup C.

[0122] The first communication device 203 is a wireless communication device connected to the control unit 300 (external) via a wireless communication network. The cup unit 200 can transmit a detection signal (cup-in information) of the first sensor 202 to the control unit 300 (external) via the first communication device 203, and can receive information from the external device.

[0123] In addition, the cup unit 200 includes additional devices such as a camera 205 for capturing images of the area around the cup C, an audio device 206 including an amplifier, speaker, and microphone, a lighting device 207, a laser irradiator 208, and a power supply (not shown) for supplying power. These devices 201 to 208, as well as various other devices not shown, may be detachably attached to the cup unit 200 or may be integrally provided with the cup unit 200. Sensors may also be provided, such as a speed sensor, an acceleration sensor, a gyro sensor, a magnetic sensor, a biometric authentication sensor, an air pressure sensor (pressure sensor), a temperature sensor, a microphone (sound pressure sensor), a direction sensor, a proximity sensor, a brightness sensor (ambient light sensor), a human presence sensor, an anemometer, a wind vane, an infrared sensor, an infrared camera, and a snow depth meter (such as a snow depth meter based on laser reflection or images captured by a camera). That is, cup C can be configured as a multi-functional "AI cup" that automatically detects whether golf ball B has gone into the cup, outputs sound, performs predetermined functions in response to predetermined voice input such as "Alexa (registered trademark)," "OK Google (registered trademark)," or "Hey Siri (registered trademark)," emits light, and individually identifies ball B. When identifying ball B that has fallen into cup C using cup unit 200, it is preferable to brighten the inside of cup C using a light source (illumination means, lighting device 207 in FIG. 25 ) in cup unit 200 (cup C). This improves the identification ability when identifying ball B that has fallen into cup C using camera 205 of cup unit 200.

[0124] <Pin Unit> The pin unit 500 is attached to the pin P and is a mechanism provided to provide the control unit 300 with monitor information about the area around the pin P. The pin unit 500 includes a second control device (referred to as "control device" in the figure) 501, a first camera (first photographing means, referred to as "camera" in the figure) 502, a second communication device (second transmission device, referred to as "communication device" in the figure) 503, a first illuminator (referred to as "laser" in the figure) 504, and a second light receiver (referred to as "light receiver" in the figure) 505.

[0125] The second control device 501 is an electrical control device including a processor, a storage device, etc. that controls the pin unit 500. The second control device 501 is connected to a first camera 502, a second communication device 503, a first illuminator 504, and a second light receiver 505 so as to be able to exchange data.

[0126] The first camera 502 is an image sensor provided to capture video (first video data) around the pin P. In this embodiment, the first camera 502 is a capturing device that captures video at least from the pin P toward the hitting area T2. As an example, the first camera 502 may be configured as a "360-degree camera" that can capture video in all directions, 360 degrees, in the vertical and horizontal directions, centered on the pin P. Note that the first camera 502 is not limited to a 360-degree camera, and may also be a camera that captures a range narrower than 360 degrees. The first camera 502 may also be configured as a 3D camera.

[0127] The second communication device 503 is a wireless communication device connected to the control unit 300 (external) via a wireless communication network. The second communication device 503 can transmit video data captured by the first camera 502 to the control unit 300 (external) and receive information from the external device. The first illuminator 504 is a light source that emits guide laser light that indicates a straight line from the pin P toward the hitting area T2. The straight line indicates the rolling trajectory of the ball B. The trajectory of the laser light functions as a guide line that indicates the trajectory of the ball B. Here, the trajectory of the ball B is the trajectory connecting the cup C to a predetermined hitting position. The second light receiver 505 is a light receiving element (sensing device) that receives (detects) the guide laser light (guide sub-laser light) from the second illuminator 705 provided in the club unit 700 described later.

[0128] In addition, the pin unit 500 may be provided with additional devices such as an audio device 506 including an amplifier, speaker, and microphone, a lighting device 507, a power supply (not shown) for supplying power, a laser illuminator, and an automatic operation mechanism for automatically adjusting various aspects of image capture by the first camera 502 (e.g., focusing, brightness adjustment, tracking of a subject, switching of image capture direction, etc.), which may be detachable from or integral with the pin unit 500. Furthermore, the pin unit 500 may be provided with sensors 508, such as a speed sensor, an acceleration sensor, a gyro sensor, a magnetic sensor, a biometric authentication sensor, an air pressure sensor (pressure sensor), a temperature sensor, a microphone (sound pressure sensor), a direction sensor, a proximity sensor, a brightness sensor (ambient light sensor), a human presence sensor, an anemometer, a wind vane, an infrared sensor, an infrared camera, a snow depth meter (such as a snow depth meter based on laser reflection or an image captured by a camera), etc. That is, the pin P can be configured as a multi-functional "AI pin" that automatically captures surrounding images, outputs audio, performs predetermined functions in response to predetermined voice inputs such as "Alexa (registered trademark)," "OK Google (registered trademark)," or "Hey Siri (registered trademark)," emits light, and individually identifies the ball B. When identifying the ball B that has fallen into the cup C using the camera 502 of the pin unit 500, it is preferable to illuminate the inside of the cup C using a light source (illumination means, the lighting device 207 in FIG. 25 ) attached to the cup unit 200 (cup C) as described above or the lighting device 507 of the pin unit 500. This improves the identifiability of the ball B that has fallen into the cup C when using the first camera 502 or the camera 205 of the cup unit 200. Furthermore, for example, in poor visibility or during nighttime golf practice (night golf), the light-emitting function (lighting device 507) attached to the pin unit 500 can be used to enhance the identifiability of the pin P (i.e., to provide the pin P with a lighthouse function). The lighting by the lighting device 507 attached to the pin P provides, for example, lighting around the pin P, illumination, neon, light, spotlight, rotating spotlight, mirror ball, LED lighting, etc.The lighting device 507 attached to the pin P lights up when, for example, a human sensor included in the sensor 508 of the pin unit 500 detects a person approaching the pin P. This lighting function can be switched on and off.

[0129] <Club Unit> The club unit 700 is attached to the golf club 1' and is a mechanism provided to provide monitor information around the golf club 1' to the control unit 300. The golf club 1' having the club unit 700 is configured similarly to the golf club 1 described above with reference to FIGS. 1 to 25. That is, the golf club 1' has a head 3, a hosel 4, a shaft 5, and a grip, the grip 6 being formed integrally with the shaft 5, a vibration transmission member 20 incorporated in a shaft cavity 9 within the shaft 5 and a grip cavity 10 within the grip 6, the lower end of the vibration transmission member 20 being fixed to the hosel 4, and attachment members (a grip inner plate 23 and a grip inner fixture 24) connecting the upper end of the vibration transmission member 20 to the grip 6 being provided inside the grip cavity 10. The golf club 1' having the club unit 700 can also be a golf club described later with reference to FIGS. 27 to 38. The club unit 700 includes a third control device (referred to as "control device" in the figure) 701, a second camera (second photographing means, referred to as "camera" in the figure) 702, a third communication device (third transmitting device, referred to as "communication device" in the figure) 703, a second sensor (second detection means, referred to as "sensor" in the figure) 704, a second illuminator (referred to as "laser" in the figure) 705, a display device (referred to as "display" in the figure) 706, an acoustic device 707, a first light receiver (referred to as "light receiver" in the figure) 708, an illumination device 709, and a vibration sensor 710.

[0130] The third control device 701 is an electrical control device including a processor, a storage device, etc. that controls the club unit 700. Each element 702 to 710 is connected to the third control device 701 so that data can be exchanged. The second camera 702 is an image sensor provided to capture an image (second image data) of the surroundings of the golf club 1'. In this embodiment, the second camera 702 is an imaging means that captures an image at least from the head of the club 1' toward the front.

[0131] The second sensor 704 is a detection means for detecting impact information related to the impact of the golf ball as one piece of monitor information. The second sensor 704 is, for example, an impact sensor that detects impact data when the golf ball is struck with the striking surface and an angle sensor that detects the angle of the head when striking the golf ball, and is built into the head 3 (see, for example, FIG. 1A). The vibration sensor 710 is a detection means for detecting vibration information related to the vibration of the vibration transmission members 20, 20' (see, for example, FIG. 5A) provided on the golf club 1' as one piece of monitor information. The vibration sensor 710 is built into, for example, the hosel 4 (see reference numeral 95 in FIG. 23). The vibration sensor 710 may also be built into the shaft 5 or the grip 6. The second irradiator 705 is a light source that emits a guide laser beam forward from the head of the golf club 1'. The trajectory of the laser beam functions as a guide line indicating the trajectory of the ball B. Here, the trajectory of ball B is a trajectory that is approximately perpendicular to the striking surface of the head and extends linearly forward from the striking surface. The display device 706 is a display that displays visual information. An example of the display device 706 is an LCD. The audio device 707 is an audio input / output device that includes an amplifier, speaker, and microphone and reproduces audio signals and inputs sound. The first photoreceiver 708 is a photodetector (sensing device) that receives (detects) the guide laser light from the first irradiator 504 provided in the pin unit 500.

[0132] The third communication device 703 is a wireless communication device connected to the control unit 300 (external) via a wireless communication network. Via the third communication device 703, the video data captured by the second camera 702 and the detection signal of the second sensor 704 can be transmitted to the control unit 300 (external) and information can be received from the external.

[0133] In addition, the club unit 700 may be provided with a lighting device 709, a power source for supplying power (not shown), and an automatic operation mechanism for automatically adjusting various aspects of the second camera 702's image capture (e.g., focusing, brightness adjustment, tracking the subject, switching the image capture direction, etc.), which may be detachable from the club unit 700 or integral with the club unit 700. Sensors may also be provided, such as a speed sensor, an acceleration sensor, a gyro sensor, a magnetic sensor, a biometric authentication sensor, an air pressure sensor (pressure sensor), a temperature sensor, a microphone (sound pressure sensor), a direction sensor, a proximity sensor, a brightness sensor (ambient light sensor), a human presence sensor, an anemometer, a wind vane, an infrared sensor, an infrared camera, and a snow depth meter (such as a snow depth meter based on laser reflection or images captured by a camera). In other words, the golf club 1' may be configured as an "AI club" with multiple functions, such as automatically capturing surrounding images, detecting impact information, emitting laser light, outputting sound, operating in response to voice command input, and emitting light. The lighting by the lighting device 709 attached to the golf club 1' provides, for example, illumination around the golf club 1', illumination, neon, lights, spotlights, rotating spotlights, mirror balls, LED lighting, etc. The lighting device 709 attached to the golf club 1' turns on when, for example, a human presence sensor mounted on the golf club 1' detects a person approaching the golf club 1'. This lighting function can be switched on and off.

[0134] <Camera Unit> The camera unit 600 is attached to the hitting area T2 of the golf training machine and is a mechanism provided to capture video of the user standing in the hitting area T2 and the user's surroundings, and to provide the video data as monitor information to devices in the system S, including the control unit 300 and the terminal device 400. The camera unit 600 in Fig. 26 includes multiple cameras 602. Specifically, the multiple cameras 602 include a left camera 602L (one of the third camera means) and a right camera 602R (one of the third camera means) provided on both the left and right sides of the hitting area T2, a rear camera 602B (one of the third camera means) provided behind the hitting area T2, and a head-mounted head camera 602H (fourth camera means) worn on the user's head.

[0135] The left and right cameras 602L, 602R and the rear camera 602B are imaging means for capturing images (third image data) of the user from both the left and right sides and from behind. The head camera 602H is imaging means for capturing images (fourth image data) of the user's line of sight while practicing golf. The image data captured by the imaging unit 600 is transmitted via a communication device 601 (fifth transmission device) to devices within the system S, such as the control unit 300 and the terminal device 400. The imaging unit 600 includes a control device (not shown) that allows various adjustments related to imaging by the camera 602 (for example, focusing, adjusting brightness, tracking the subject, switching the imaging direction, etc.).

[0136] <Control Unit> The control unit 300 is a computer that controls and manages the system S. The control unit 300 is installed at any location, such as near the training aircraft T or at a system base remote from the training aircraft T. The control unit 300 includes a control device 301, a receiving device (first receiving device, referred to as the "receiving device" in the figure) 302, a first transmitting device (fourth transmitting device, referred to as the "transmitting device" in the figure) 303, and a storage device 304. The receiving device 302 and the transmitting device 303 are devices for sending and receiving data to and from the outside via a wireless communication network.

[0137] The control unit 300 receives, as monitor information, various types of video data and sensor detection data acquired by the units 200, 500, 600, and 700 in the system S via the receiving device 302. The control device 301 is a device that generates predetermined guide information based on the above monitor information, and is, for example, a processor that has implemented a software program for generating guide information. The guide information is information that provides the user with guidance on the above golf play.

[0138] The storage device 304 is a storage for storing various data. The storage device 304 is provided with a temporary storage device for temporarily saving received monitoring information, as well as a database in which a history of monitoring information over a certain period is accumulated in association with ID information for each user. The history of monitoring information is data that is treated as so-called "big data."

[0139] In addition to the monitor information, various other information is stored in the storage device 304. Examples of other information stored in the storage device include training machine information regarding the slope and turf texture of the golf training machine T on which the system S is used, and personal information regarding the user's age, gender, golfing ability, etc. When generating guide information, the control device 301 may take into account not only the received monitor information but also the above history and other information. This increases the amount and variety of information taken into account when generating guide information, making it possible to provide the user with higher quality guidance.

[0140] The transmitting device 303 transmits the guide information generated by the control device 301 to the terminal device 400. Furthermore, the transmitting device 303 may transmit the guide information to at least one of the cup unit 200, the pin unit 500, the club unit 700, and the photographing unit 600 (i.e., any device in the system S) in addition to or instead of the terminal device 400. Note that the various functions of the control unit 300, including the guide information generation process in the control device 301, may be provided by cloud computing using computing services on a cloud environment (Internet environment).

[0141] <Terminal Device> The terminal device 400 is a portable information terminal device that can be carried by a user. The terminal device 400 includes a fourth control device (referred to as the "control device" in the figure) 401, a display 402 (presenter, referred to as the "display (presenter)" in FIG. 26), a fourth communication device (second receiving device, referred to as the "communication device" in the figure) 403, and an input device 404. The fourth control device 401 is an electrical control device configured to include a processor and a storage device that implement a software program for overall control of the terminal device 400. The fourth communication device 403 is a wireless communication device connected to the control unit 300 (external) via a wireless communication network. The fourth communication device 403 can receive guide information from the control unit 300 and transmit various information to the external device via the fourth communication device 403.

[0142] The display 402 is an example of a presenting device that displays (presents) a guide based on the guide information to the user using some kind of visual image, such as a moving image or a still image. An example of the display 402 is an LCD. The input device 404 is, for example, a touch panel sensor, a button switch, or the like.

[0143] Examples of presenters other than the display 402 include an audio device 405 that outputs sound, a light-emitting lighting device (not shown), and a vibration generating mechanism (not shown) that generates vibrations. When an audio device is used as a guide presenter, guidance for golf play is presented by, for example, music, voice, electronic sounds, sound effects, or some other sound. When a lighting device is used as a guide presenter, guide displays or support content are presented by flashing light or changing the light color. In the case of a vibration generating mechanism, guidance for golf play is presented by vibration.

[0144] In addition, various sensors may be built into the terminal device 400. Examples of the sensors include a gyro sensor, a magnetic sensor, a GPS, a biometric authentication sensor, a radar sensor, an air pressure sensor (pressure sensor), a temperature and humidity sensor, a microphone (sound pressure sensor), a direction sensor, a proximity sensor, a brightness sensor (ambient light sensor), an image sensor (camera 406), a vital sensor, a pulse sensor, a body temperature sensor, a moisture sensor, a blood pressure sensor, a distance sensor, a tilt sensor, a terrain sensor, a human presence sensor, an anemometer, a wind vane, an infrared sensor, an infrared camera, and a snow depth meter (such as a snow depth meter based on laser reflection or an image captured by a camera).

[0145] Portable devices used for the terminal device 400 include portable information terminal devices such as smartphones and tablet devices, and wearable devices that can be worn by the user. Alternatively, a well-known golf rangefinder that uses a laser to measure the distance from the user to a target may be used as the terminal device 400. From the viewpoint of achieving both golf play and display visibility, it is preferable to use a wearable device as the terminal device 400.

[0146] Examples of wearable devices include smart glasses, eyeglass-type wearable devices, and smart watches. Among wearable devices, head-mounted wearable devices, such as smart glasses and eyeglass-type wearable devices, are preferred because they allow users to view guide and support content displays without stopping their golf game. When a head-mounted wearable device is used as the terminal device 400, the head camera 602H of the photographing unit 600 is configured as a camera 406 mounted on the head-mounted wearable device used as the terminal device 400. The terminal device 400 may also include an audio device (audio input / output device) 405 including earphones, headphones, a microphone, etc. The terminal device 400 may also be executable with an application program for executing the functions of the control unit 300 (such as the overall management function of the system S, the generation and provision of guide information, etc.). In this case, the terminal device 400 can perform functions such as the overall management of the system S, the generation and provision of guide information, together with the control unit 300 or in place of the control unit 300.

[0147] [2. Control] Next, a specific example of control for providing a guide in the present system S will be described. In the control unit 300, the control device 301 constantly receives, as monitor information, image data acquired from the camera 205 of the cup unit 200, the first camera 502 of the pin unit 500, the cameras 602L, 602R, 602B, and 602H of the photographing unit 600, and the second camera 702 of the club unit 700, cup-in information from the first sensor 202 of the cup unit 200, impact information from the impact sensor and angle data from the angle sensor included in the second sensor 704 of the club unit 700, and vibration information from the vibration sensor 710 of the club unit 700.

[0148] The control device 301 stores the received video data, cup-in information, impact information, angle data, and vibration information (monitor information) in a storage device and accumulates them as big data, and based on this monitor information, generates guide information to provide guidance to the user's golf play.

[0149] <Providing Guidance> First, an example of control for providing guidance (instructions) for golf play will be described. The control device 301 analyzes acquired video data using well-known image analysis technology to calculate play situation estimation data. The play situation estimation data is data estimated from the video. The estimated data includes, for example, the user's current position, the user's posture before swinging, head-up analysis, head-up check, the user's line of sight, head position, stance, distance to the pin P, and the like. The play situation estimation data allows the control unit 300 to grasp (estimate) the play situation based on the monitor information.

[0150] The control device 301 generates guide information based on the calculated play situation estimation data and model (model play) data. The guide information is advice (guide) for achieving a better shot based on the current play situation (such as the user's current position, the user's posture before the swing, head-up analysis, head-up check, the user's line of sight, head position, stance, and distance to the pin). Specifically, the guide information presents golf play tips such as a model swing trajectory, a model form, swing rhythm, ball launch direction, standing position, foot width, and accurate impact using images, photos, videos, audio, rhythmic sounds, or text. Additionally, the playing form of a master or expert golfer, for example, a professional golf player, can also be presented as a model play.

[0151] Model data that serves as a reference for guiding golf play, and various video, image, and audio data for generating guide information are stored in advance in the storage device 304. Examples of the model data include the user's posture before swinging, the user's line of sight, head position, stance, body movement, and golf club trajectory.

[0152] The control device 301 transmits the generated guide information to the terminal device 400. The terminal device 400 outputs guide content for golf play based on the guide information from the display device 402 and the sound device 405. The destination of the guide information may be the terminal device 400, the display device 706 and the sound device 707 of the club unit 700, the other units 200 and 500, etc.

[0153] The guide content is at least one of a guide video and a guide audio. Examples of the guide video include the user's eye position during the swing, head position, posture, head-up analysis, head-up check, hitting form, golf club stroke trajectory, head angle, ball launch angle, head speed, hitting strength, swing tempo, glove path (trajectory), and putter face direction (angle). Examples of the guide audio include a metronome sound (including music, voice, and other rhythmic sounds) that guides the swing rhythm of the golf club, and advice (audio comments) for improving golf play. The device may also be connected to an interactive online golf lesson service via the Internet.

[0154] As a guide for playing golf, predicted results from the current playing situation may be presented, such as predicted ball trajectory, predicted swing trajectory, predicted form, etc.

[0155] When generating the guide information, the control device 301 can take into account monitor information accumulated as big data, practice field information regarding the slope and turf grain of the green, and personal information regarding the user's age, gender, physique, constitution, height, weight, golfing skills, etc. Taking various information into account can improve the accuracy of the golf play guidance provided by the guide information. Furthermore, by incorporating the user's golf play information history into the guide information, the user's "habits" can be more easily reflected, making it possible to provide personalized golf play guidance. Furthermore, the control device 301 may have a function (generation AI) that learns various collected and accumulated data and automatically generates guide information.

[0156] <Guidance by Laser Beam> In the present system S, a laser beam (guide laser beam) is emitted from the first illuminator 504 of the pin unit 500 toward the hitting area T2. Meanwhile, a first light receiver 708 is provided in the club unit 700 of the golf club 1' used by a user of the hitting area T2. Therefore, when the user stands in an appropriate position with respect to the pin unit 500, the first light receiver 708 of the club unit 700 receives the laser beam from the first illuminator 504. When the first light receiver 708 receives the guide laser beam, a display device in the system S displays this fact. Examples of the display device include the display device 402 of the terminal device 400 and the display device 706 of the club unit 700. Furthermore, when the first light receiver 708 receives the guide laser beam, a notification to that effect may be output by voice from a speaker in the system S. The speakers in the system S include the sound device 405 of the terminal device 400, the sound device 206 of the cup C, the sound device 506 of the pin P, the sound device 707 of the club unit 700, and the like.

[0157] Furthermore, a laser beam (guide sub-laser beam) is emitted from the second illuminator 705 of the club unit 700. When the user is standing at an appropriate position relative to the pin P, the laser beam from the second illuminator 705 is emitted toward the pin P (pin unit 500). Meanwhile, the pin unit 500 is provided with a second light receiver 505. Therefore, when the user is standing at an appropriate position relative to the pin unit 500, the second light receiver 505 of the pin unit 500 receives the laser beam from the second illuminator 705 of the club unit 700. When the second light receiver 505 receives the guide sub-laser beam, a display device in the system S displays this fact. Examples of the display device include the display 402 of the terminal device 400 and the display device 706 of the club unit 700. When the second light receiver 505 receives the guide sub-laser beam, a notification to that effect may be made by audio output from a speaker in the system S. The speakers in the system S include the sound device 405 of the terminal device 400, the sound device 206 of the cup C, the sound device 506 of the pin P, the sound device 707 of the club unit 700, and the like.

[0158] As described above, when the first light receiver 708 receives the guide laser beam, the display in the system S displays that fact, and when the second light receiver 505 receives the guide sub-laser beam, the display in the system S displays that fact, so that the user can confirm through the display that he or she is standing in the appropriate position relative to the pin unit 500. The display content may be anything as long as it informs the user that he or she is standing in the appropriate position relative to the pin unit 500. The respective trajectories of the laser beam from the first light receiver 708 and the laser beam from the second light receiver 505 function as guide lines indicating the trajectory of ball B, so that the user can understand the launch direction of ball B after standing in the appropriate position relative to the pin unit 500. Therefore, a visual guide regarding putting (hitting ball B) can be provided to the user.

[0159] Furthermore, using the first illuminator 504 of the pin unit 500 and the second illuminator 705 of the club unit 700, it is possible to present guide light in both directions, using laser light from the front and laser light from the rear. Bidirectional guide light can provide more reliable guidance. The irradiation angle between the first illuminator 504 of the pin unit 500 and the second illuminator 705 of the club unit 700 can be automatically adjusted based on the analysis results of the monitor information and video data described above. This allows for the direction of the laser light to be adjusted, enabling accurate guidance that reflects the current playing situation.

[0160] <Feedback of Current Analysis Results> Furthermore, the control device 301 can provide feedback on the play results after the hit is completed based on the results of analyzing the video data. In this case, the control device 301 identifies the swing made by the user in the video based on the results of analyzing the video data, analyzes the identified swing, and tracks the hit golf ball B in the video to analyze the movement of the golf ball B. Here, analyzing and evaluating the swing includes analyzing the user's form and analyzing the movement of the golf club (head).

[0161] Examples of analysis items for the user's form include the user's eye position, head position, posture, head-up analysis, and head-up check. Examples of analysis items for the golf club (head) movement include the golf club stroke trajectory, head angle, head speed, impact strength, putter face angle, ball launch angle, club path (in-out / out-in movement of the club head at impact), swing tempo, swing flow, and club head flow.

[0162] Examples of analysis items for the movement of golf ball B include the speed of golf ball B, the launch angle (launch direction) of golf ball B, and the flight distance of golf ball B. The control device 301 calculates analysis result data for each of the above items by analyzing the video data, and generates the calculated various analysis result data as practice support information. The analysis result data generated as support information is used as information for displaying the analysis results and evaluation of golf play for each of the above items.

[0163] The control device 301 transmits the analysis result data generated as support information to the terminal device 400. The fourth control device 401 of the terminal device 400 displays the analysis results and evaluation of the golf play for each of the above items on the display 402 as practice support content based on the received analysis result data (support information). In other words, feedback on the golf play results is provided. Such feedback contributes to improving the user's golfing technique. Furthermore, visualizing one's own play as numerical values ​​and images also contributes to improving the enjoyment of golf.

[0164] Examples of golf play analysis results displayed as support content on the display 402 are listed below. Examples of support content include the speed of golf ball B, the launch angle (launch direction) of golf ball B, the flight distance of golf ball B, the number of rotations of ball B, the rotation direction of ball B, the rotation speed, ball quality, the quality of rotation, a video recording the user's form during the swing, a series of high-speed photographs of the user's form during the swing, the user's eye position during the swing, the position and posture of the head, head-up analysis, head-up check, the golf club stroke trajectory, the measured head angle, the measured head speed, the measured strength of the impact, the swing tempo, the swing flow, and the flow of the club head. The golf club stroke trajectory includes the so-called glove path. The head angle includes the orientation (angle) of the putter face.

[0165] Feedback on the golf play result is not limited to the visual feedback described above, but may also be provided by audio information (i.e., auditory feedback). Specifically, auditory feedback refers to the transmission of the analysis results of the golf play by audio. Specifically, audio such as "Nice shot," "Out of alignment," "Hooked," "Open," "Out of alignment n degrees (n is any number)," "Hooked n degrees (n is any number)," and "Open alignment n degrees (n is any number)" may be output in response to the user's swing. These audio feedbacks can be provided in combination with the visual feedback described above.

[0166] In this case, the storage device 304 of the control unit 300 is provided with a database that stores various voice data (audio data) used for auditory feedback. Based on the calculated various analysis result data, the control device 301 extracts voice data to be provided to the user from the database and generates practice support information including this voice data. The terminal device 400 outputs voice based on the transmitted voice data. For example, headphones or earphones can be used to output the voice. Note that the voice output is not limited to the terminal device 400 and may be performed by an audio device of any device within the system S.

[0167] <Banner Advertisement> The control device 301 may generate banner advertisement display information in conjunction with providing the above-mentioned guide information or providing feedback on the golf play results, and transmit the banner advertisement display information to the terminal device 400 of the user.

[0168] The banner advertisement display information is information for displaying a banner advertisement video (a small advertisement displayed in a part of the screen). In this case, the terminal device 400 displays the banner advertisement in association with the provision of guide information or feedback on the golf play results. The banner advertisement may be displayed on any display device in the system S, in addition to the terminal device 400. The control device 301 may generate advertising audio output information instead of or in addition to the banner advertisement display information, and transmit it to the terminal device 400 of the user. In this case, the terminal device 400 outputs advertising audio in association with feedback on the golf play results. The content of the output video or audio is not limited to advertising, and may be any video or audio (e.g., ASMR).

[0169] In addition, the content provided from the control unit 300 to the terminal device 400 and other devices 200, 500, 700 in this system S is not limited to the above. For example, audio and video guidance for "prize presentation," advertising video and audio, points awarded at stores and websites, miles, mileage, stay mileage, discount tickets, service coupons, music, audio support, lighting effects, etc. may be provided.

[0170] In this case, the storage device 304 of the control unit 300 is provided with a database that stores a large amount of information (including advertising video signals) related to advertising videos, advertising audio, point awards at stores and websites, music, support audio, lighting effects, etc. For example, in response to a cup-in, the control unit 300 extracts information related to advertising videos, advertising audio, point awards at stores and websites, miles, mileage, stay mileage, discount tickets, service coupons, music, support audio, lighting effects, etc. from the database and transmits it to the terminal device 400. Support audio is audio that enhances the enjoyment of golf, specifically, cheers, cheers, applause, etc. from the gallery. Lighting effects are effects that enhance the user's enjoyment of golf by controlling the on / off, color, brightness, etc. of light source devices in the system S. Lighting provides illumination, neon lights, lights, spotlights, rotating spotlights, mirror balls, LED lighting, etc. Lighting effects may be accompanied by music. The user can select a desired music genre or song, such as disco, gravure music, classical music, pop music, enka, etc. In the lighting effect, it is preferable to change the control of the light source device according to the selected music genre.

[0171] The timing for providing banner advertising videos, advertising audio, music, etc. is not limited to when the ball goes into the hole. Advertising videos, advertising audio, music, radio broadcasts, movies, etc. can be provided at any time during practice using the training device T. Providing "music" as described above includes playing music based on a playlist of desired music genres or songs created by the user, as well as playing music selected by a DJ (disc jockey). The user may be able to request a desired song from the DJ's selection. The music provided may also be so-called "karaoke." In this case, the user can sing along with the karaoke performance. The user can freely turn on or off the playback of audio and video from advertising videos, advertising audio, music, radio broadcasts, movies, television, video streaming services, etc. In other words, the user can individually select whether or not the various content described above is provided, for example, from the terminal device 400.

[0172] In addition, a competitive game function, a putting game, an approach game, and the like linked to the acquired monitor information may be provided by the terminal device 400. When the user's terminal device 400 is a wearable device (head-mounted wearable device) that is worn on the head, such as smart glasses or an eyeglass-type wearable device, the above-mentioned various guide displays and images of the support content are superimposed on the real world and displayed on the display 402 of the terminal device 400. In this way, by providing guide displays and support content as AR (Augmented Reality), VR (Virtual Reality), or MR (Mixed Reality), the user's enjoyment of playing golf can be further enhanced.

[0173] If the user's terminal device 400 is a wearable device (head-mounted wearable device) that is worn on the head, such as smart glasses or an eyeglass-type wearable device, the display 402 of the terminal device 400 can be used to play audio and video such as advertising videos, advertising audio, music, radio broadcasts, and movies, as well as browse websites and various file documents while playing golf or moving between courses. In other words, while playing golf, the user can have an auditory and visual experience or perform auditory and visual tasks separate from golf. The user can select the various guide displays and support content described above from the terminal device 400 as appropriate and receive the support content in the desired combination.

[0174] Furthermore, the analysis results of the video data and the generated support information may be stored as big data in the storage device of the control device 301 (control unit 300). By storing the analysis results of the video data and the generated support information as big data in the control unit 300, a data platform that aggregates golf play information can be provided. Big data can be mutually utilized by multiple golf training machines.

[0175] In the golf practice system S shown in FIG. 26 , a display (monitor) 1M for the user is disposed in the hitting area T2. This monitor 1M is an example of a display device for displaying various information and is installed near the user. The monitor 1M is equipped with a control device 901, a display device 902, a communication device 903, an input device 904, an audio device 905, a camera 906, sensors 907, a lighting device 908, and the like. Sensors that may be provided include, for example, a speed sensor, an acceleration sensor, a gyro sensor, a magnetic sensor, a biometric authentication sensor, an air pressure sensor (pressure sensor), a temperature sensor, a microphone (sound pressure sensor), a direction sensor, a proximity sensor, a brightness sensor (ambient light sensor), a human presence sensor, an anemometer, a wind vane, an infrared sensor, an infrared camera, a snow depth meter (such as a snow depth meter based on laser reflection or images captured by a camera), and the like. In other words, the monitor 1M functions as one of the devices within the practice system S, and can be configured as a multi-functional AI device that can work in conjunction with other devices within the system S, display various information to the user, output audio, perform specified functions in response to specified voice input such as "Alexa (registered trademark)," "OK Google (registered trademark)," or "Hey Siri (registered trademark)," and emit light.

[0176] The monitor 1M may display the various guides described above, support content, video and still images of the user's form, weather, current news, the user's score, ranking, etc. The monitor 1M allows the user to easily check the visual information provided by the system S. In addition, the monitor 1M functions as one element of the golf practice system S in cooperation with other devices in the system S. For example, the user may use the monitor 1M to connect to an interactive online golf lesson service via the Internet.

[0177] Furthermore, an electronic scoreboard 800 (display) may be installed at any location within the golf practice system S (for example, behind the cup area T1). The electronic scoreboard 800 is an example of a display for displaying various information within the golf practice system S, and is preferably a large display device, for example, from the viewpoint of ensuring visibility. However, the size of the electronic scoreboard 800 is not particularly limited. The electronic scoreboard 800 may be configured as an information terminal device equipped with attached mechanisms such as a control device 801, a display device 802, a communication device 803, an input device 804, an audio device 805, a camera 806, a sensor 807, and an illumination device 808, and can function as one of the devices constituting the system S.

[0178] The sensor 807 may include, for example, a speed sensor, an acceleration sensor, a gyro sensor, a magnetic sensor, a biometric authentication sensor, an air pressure sensor (pressure sensor), a temperature sensor, a microphone (sound pressure sensor), a direction sensor, a proximity sensor, a brightness sensor (ambient light sensor), a human presence sensor, an anemometer, a wind vane, an infrared sensor, an infrared camera, a snow depth meter (such as a snow depth meter based on laser reflection or images captured by a camera), etc. In other words, the electronic bulletin board 800 functions as one of the devices in the practice system S, and can be configured as a multi-functional AI device that cooperates with other devices in the practice system S, displays various information to the user, outputs audio, performs predetermined functions in response to predetermined voice input such as "Alexa (registered trademark)," "OK Google (registered trademark)," or "Hey Siri (registered trademark)," and emits light.

[0179] The display of various information on the electronic scoreboard 800 is controlled by, for example, the control unit 300. The electronic scoreboard 800 is not limited to being controlled by the control unit 300, but may be controlled by any of the cup unit 200, the control unit 300, the terminal device 400, the pin unit 500, the photographing unit 600, and the club unit 700 in the system S. The electronic scoreboard 800 may display the above-mentioned various guide displays and support content. In addition to the above-mentioned guides and content, any information such as weather, current news, user scores, rankings, etc. may be displayed on the electronic scoreboard 800. Furthermore, a projector may be provided instead of or in addition to the electronic scoreboard 800. The projector can project images into the system S using projection mapping.

[0180] All of the cameras installed within the golf practice system S may be 3D cameras. Furthermore, each device within the golf practice system S may be configured to share its respective power status (e.g., remaining battery level) and operating status (meters). Furthermore, since the photographing units 600 are positioned to surround the user standing in the hitting area T2, the photographing units 600 can capture a full-body (all-around) image of the user. This image information can be used to obtain measurement data when customizing clothing, accessories, and tools, such as golf wear, golf caps, golf shoes, and golf clubs. This image information can also be used to create icons, avatars, and characters (two-dimensional and three-dimensional characters) for users to use on social networking sites (SNS) on the Internet. The created avatars can be used in a three-dimensional virtual space constructed on a computer, such as the Metaverse.

[0181] 3. Effects and Advantages The golf training system S of this embodiment has the above-described configuration and therefore provides the following effects and advantages.

[0182] (1) According to the present system S, at least one of the following monitor information is acquired: cup-in information from the first sensor 202 of the cup unit 200; video data captured by the first camera 502 of the pin unit 500 from the pin P toward the hitting area T2 (rearward); video data captured by the second camera 702 of the club unit 700 from the head toward the front; impact data and head angle data detected by the second sensor 704 of the club unit 700; and vibration information detected by the vibration sensor of the club unit 700. The control unit 300 grasps the current playing situation based on the monitor information and generates guide information for providing guidance to the user's golf play according to the playing situation. The terminal device 400 provides the user with guidance according to the guide information in advance (in advance) before the user hits the ball. Guidance is provided based on monitor information obtained from multiple monitor information sources (cup unit 200, pin unit 500, club unit 700) located at the front (cup C side) and rear (hitting area T2 side) of the training machine T. The monitor information includes multiple types, including video data, impact information, vibration information, and cup-in information. Therefore, highly accurate guidance is provided that takes into account numerous factors. This enhances the effectiveness of practice. Here, since the monitor information includes vibration information related to the vibration of the vibration transmission member 20, guidance based on the vibration information can be provided. For example, the correlation between the vibration information and the impact information (other monitor information) (e.g., the relationship between vibration and the quality of the impact) can be analyzed and the analysis results can be presented, or the analysis results can be accumulated and fed back to the user. Furthermore, the vibration information can be visualized using numerical values, graphs, etc., or the vibration information can be accumulated as big data. Furthermore, the first illuminator 504 of the pin unit 500 and the second illuminator 705 of the club unit 700 can be used to project guide light in both directions, using laser light from the front and laser light from the rear. This enables more accurate guidance than a structure that irradiates guide light in one direction from the golf club.

[0183] [III. Other] Modifications of the golf clubs 1, 1' used in the above embodiments are listed below. The golf club 1 shown in Figure 5(A) above is an example in which one mass member 26 is attached to the vibration transmission member 20, but the golf clubs 1, 1' may have multiple mass members 26 attached to the vibration transmission member 20, as shown in Figure 27(A), for example.

[0184] In the golf club 1, 1', various electrical devices may be attached to the hosel 4, such as a pickup that detects vibrations, an amplifier that amplifies the vibrations, a speaker that converts the vibrations into an audio signal and outputs it, a microphone, an actuator that electrically vibrates the vibration transmission member 20, a communication device, a battery, etc. Specific mounting locations of the various electrical devices are not particularly limited, and they may be mounted anywhere on the golf club 1, 1'. For example, as shown in FIG. 27(B), various electrical devices 4E may be mounted on the upper end 4U of the hosel 4 of the golf club 1. However, the various electrical devices 4E may also be provided on the shaft 5 or the grip 6.

[0185] As shown in FIG. 28(A), a speaker 21S may be built into the upper end of the grip 6, facing upward, instead of the grip upper end plate 21 (grip end). In this case, the sound output of the speaker 21S faces upward, making it easier to transmit sound to the user. As shown in FIG. 28(B), the upper end of the grip 6 may have an opening 21Z connecting the grip hollow portion 10 to the outside, and the inner periphery of the grip hollow portion 10, including the opening 21Z, may be formed into a horn shape that can emphasize (reverberate) sound. In this case, the opening 21Z serves as a sound output port for the ball impact sound, making it easier to transmit sound to the user. Sound from a speaker built into the golf club (not shown in FIG. 28(B)) may also be output through the opening 21Z. Furthermore, sound collected by a microphone (pickup) (not shown in FIG. 28(B)) may be output from the speaker built into the golf club through the opening 21Z. The golf clubs 1, 1' having a microphone (pickup), a speaker and an opening 21Z can be said to be equipped with a loudspeaker function.

[0186] Furthermore, when the upper end of the grip 6 forms an opening 21Z as shown in FIG. 28(B) above, it is preferable to close the opening 21Z with a mesh-like (mesh-like) cap 21X as shown in FIG. 28(C), for example. This ensures sound emission from the opening 21Z and prevents foreign matter from entering the grip 6. The mesh-like cap 21X may be made of any material, such as cloth or plastic. A removable cap 21Y, as shown in FIG. 28(D), may be used to close the opening 21Z. The removable cap 21Y may be attached or detached in any known manner, such as by screw or snap-on. Providing the removable cap 21Y facilitates inspection and maintenance of the interior of the golf club 1.

[0187] 28(E), the motor 43 and the winding device 44 may be incorporated into a detachable cap 21W. With this detachable cap 21W, the motor 43 and the winding device 44 can be attached and detached together with the cap 21W, facilitating inspection and maintenance of the motor 43 and the winding device 44. In addition, the golf club 1, 1' may have a detachable attachment between the hosel 4 and the shaft 5, a detachable attachment between the shaft 5 and the grip 6, or a detachable attachment between the head 3 and the hosel 4. In other words, the head 3, the hosel 4, the shaft 5, and the grip 6 of the golf club 1, 1' may each be disassembled.

[0188] As shown in FIG. 29A , a tuning-fork sounding body 20S may be attached to a golf club 1, 1′ instead of the vibration transmission member 20. In this case, the golf club 1, 1′ has a head 3, a hosel 4, a shaft 5, and a grip. The grip 6 is integrally formed with the shaft 5, the vibration transmission member 20 is incorporated in a shaft cavity 9 in the shaft 5 and a grip cavity 10 in the grip 6, and the lower end of the vibration transmission member 20 is fixed to the hosel 4. The tuning-fork sounding body 20S is a tuning-fork-shaped member with an upper portion split into two branches (U-shaped), and is formed as a sounding body that emits sound through vibration. The lower end (one end) of this tuning-fork sounding body 20S is fixed to the hosel 4A (hosel 4) via a fastener 22, and is incorporated in the shaft cavity 9. The tuning-fork sounding body 20S is set to a dimension shorter than the axial dimension of the shaft 5, and its upper end is not fixed to the shaft 5 or the grip 6. With this golf club 1, 1', when a golf ball is struck with the striking surface 2 of the head 3, the impact and vibration are transmitted to the tuning fork-type sounding body 20S via the head 3 and hosel 4, and the impact and vibration cause the tuning fork-type sounding body 20S to vibrate and emit sound. This allows the user to hear the sound associated with the strike. This improves the feel and sound of the impact.

[0189] The golf club 1, 1' shown in Figure 29(B) differs from the golf club 1, 1' shown in Figure 29(A) in that the hosel 4A has a hosel cavity 8, but is otherwise the same. In this case, the tuning-fork sounding body 20S is fixed to the inner circumferential surface of the hosel cavity 8 via a fixing device 22. The golf club 1, 1' shown in Figure 29(B) has the same effects as the golf club 1, 1' shown in Figure 29(A) described above.

[0190] The golf club 1, 1' shown in Figure 29(C) is different from the golf club 1, 1' shown in Figure 29(A) in that a string-like vibration transmission member 20, 20' is connected to the upper end of a tuning-fork-type sounding body 20S, and the upper end of the vibration transmission member 20, 20' is attached to a winding device 44, but is otherwise the same. In this case, in addition to the tuning-fork-type sounding body 20S vibrating to produce sound, the vibration transmission member 20, 20' transmits vibrations to the grip 6, improving the feel on impact, and adjusting the position with the winding device 44 can further improve the feel on impact.

[0191] The golf club 1, 1' shown in Figure 29(D) differs from the golf club 1, 1' shown in Figure 29(B) in that an opening 8X that connects the hosel cavity 8 with the outside is provided in the hosel 4, and the tuning-fork-type sounding body 20S can be inserted into and removed from the hosel cavity 8 and the shaft cavity 9 through the opening 8X, but is otherwise the same. The opening 8X can be closed with a lid 8Y. In this case, the opening 8X serves as an access port for inserting and removing the tuning-fork-type sounding body 20S into and from the hosel cavity 8 and the shaft cavity 9. This makes it easy to attach and detach the tuning-fork-type sounding body 20S to and from the golf club 1, 1'. The tuning-fork-type sounding body 20S may be attached to the hosel cavity 8 and the shaft cavity 9 separately from the opening 8X, or the tuning-fork-type sounding body 20S may be attached to the hosel cavity 8 and the shaft cavity 9 integrally with the opening 8X. The tuning-fork-type sounding body 20S and the opening 8X being separate means that the lower end of the tuning-fork-type sounding body 20S (and the fixing device 22) is not attached to the opening 8X, and the tuning-fork-type sounding body 20S is attached to and detached from the golf club 1, 1' separately from the opening 8X. The tuning-fork-type sounding body 20S being integrated with the opening 8X means that the lower end of the tuning-fork-type sounding body 20S is attached to the opening 8X via the fixing device 22, and the tuning-fork-type sounding body 20S is attached to and detached from the golf club 1, 1' together with the opening 8X (is a insert type).

[0192] The tuning-fork speaker 20S may be positioned so as to be spaced apart from the inner circumferential surface of the shaft hollow portion 9, or so as to be in contact with the inner circumferential surface of the shaft hollow portion 9. When the tuning-fork speaker 20S is spaced apart from the inner circumferential surface of the shaft hollow portion 9, the vibration of the tuning-fork speaker 20S is less likely to attenuate and the sound becomes louder than when the tuning-fork speaker 20S is in contact with the inner circumferential surface of the shaft hollow portion 9. When the tuning-fork speaker 20S is in contact with the inner circumferential surface of the shaft hollow portion 9, the vibration of the tuning-fork speaker 20S is transmitted to the shaft 5, thereby strengthening the vibration transmitted to the grip 6. The mounting position of the tuning-fork speaker 20S is not limited to the illustrated example, and may be any position. For example, in Figures 29(A) and 29(B), the tuning-fork speaker 20S is positioned so that two U-shaped rods are aligned in the front-to-rear direction, but the two U-shaped rods may also be aligned along a plane extending parallel to the striking surface 2. The posture in which the tuning-fork type sounding body 20S is attached may be freely adjustable and changeable by the user.

[0193] The tuning-fork-type speaker 20S may be combined with another vibration transmission member, as shown in Figures 30(A) and (B). In Figure 30(A), a coil spring-shaped spring member 20S' is connected to the lower end of the tuning-fork-type speaker 20S, and the tuning-fork-type speaker 20S is fixed to a fixture 22 via the spring member 20S'. In Figure 30(B), a spring member 20S' and a rod-shaped rod member 20S" are connected to the lower end of the tuning-fork-type speaker 20S, and the tuning-fork-type speaker 20S is fixed to a fixture 22 via the spring member 20S' and the rod-shaped rod member 20S". The spring member 20S' and the rod member 20S" function as vibration transmission members that transmit vibrations generated in the head 3 to the tuning-fork-type speaker 20S, and that transmit vibrations of the tuning-fork-type speaker 20S to the golf club 1. In a structure in which the tuning-fork type sounding body 20S is combined with a vibration transmitting member, the length ratio between the tuning-fork type sounding body 20S and the other member can be freely determined.

[0194] As shown in FIG. 30(C), the tuning-fork-type speaker 20S may be formed as a straight rod-shaped member with an upper portion that is not bifurcated (U-shaped). As shown in FIG. 30(D), a string-shaped vibration transmission member 20 may be connected to the upper end of the rod-shaped tuning-fork-type speaker 20S, and the upper end of the vibration transmission member 20 may be attached to a winding device 44. The tuning-fork-type speaker 20S is not limited to a rod shape, and may have any shape, such as a strip, chain, mesh, or net. A mechanism may also be provided that detects the vibration of the tuning-fork-type speaker 20S, electrically amplifies it, and produces sound. A specific example of this mechanism is a structure in which the tuning-fork-type speaker 20S is formed into a net-like shape by weaving string-shaped metal (conductive) material into a net, and a pickup coil located close to the tuning-fork-type speaker 20S converts the vibration of the tuning-fork-type speaker 20S into an electrical signal, which is then amplified by an amplifier to produce sound. Of course, a golf club equipped with the tuning fork type sounding body 20S may be applied to the golf practice system S shown in FIG.

[0195] A detachable unit 70 for detachably mounting a vibration transmission member 20 is detachably attached to a golf club 1, 1' shown in Figure 31(A). The golf club 1, 1' to which the detachable unit 70 is attached has a head 3, a hosel 4, a shaft 5, and a grip, with a shaft cavity 9 in the shaft 5 and a grip cavity 10 in the grip 6. The detachable unit 70 has a main body 70A incorporated into the shaft cavity 9 and the grip cavity 10. The main body 70A is a cylindrical member that extends in the direction (axial direction) of the shaft 5 and conforms to the inner circumferential shapes of the shaft cavity 9 and the grip cavity 10. The main body 70A of the detachable unit 70 has a lower end (one end) fixed to the hosel 4 and an upper end (the other end) fixed to a grip upper end plate 21 in the grip 6. A hollow portion 70B is formed inside the main body 70A. A vibration transmitting member 20 (shown by a broken line in the drawing) is housed in this hollow portion 70B.

[0196] Within the hollow portion 70B, the lower and upper ends of the vibration transmission member 20 are fixed to the main body portion 70A. The lower end of the vibration transmission member 20 is fixed to the lower end of the main body portion 70A. Specifically, the lower end of the vibration transmission member 20 may be fixed directly to a portion of the inner circumferential surface of the hollow portion 70B that forms the bottom surface of the main body portion 70A, or indirectly via a fastener 22 (not shown). In other words, the lower end of the vibration transmission member 20 provided within the hollow portion 70B of the detachable unit 70 can be said to be fixed to the hosel 4 via the main body portion 70A. Therefore, vibrations caused by hitting a golf ball are transmitted to the vibration transmission member 20 within the detachable unit 70 through the hosel 4. The lower end of the main body portion 70A may be disposed above and spaced apart from the hosel 4 and supported on the inner circumferential surface of the shaft 5 by a support means such as an engaging protrusion. In this case, vibrations caused by hitting a golf ball are transmitted to the vibration transmission member 20 within the detachable unit 70 through the hosel 4 and the shaft 5. The upper end of the vibration transmission member 20 may be fixed directly to the upper end of the main body 70A, or may be fixed indirectly via any mounting member such as a plate member or a winding device. Figure 31(A) shows an example in which the upper end of the vibration transmission member 20 is attached to the winding device 44. Although not shown, in addition to the winding device 44, a motor, a rack, and a pinion are also built into the main body 70A.

[0197] The detachable unit 70 can be considered a housing that houses the vibration transmission member 20 and its fasteners. The main body 70A of the detachable unit 70 is cylindrical and conforms to the inner circumferential shape of the shaft cavity 9 and the grip cavity 10. The main body 70A may have any shape as long as the hollow portion 70B is formed therein. As an example, as shown in FIG. 31(B), the main body 70A has a framework structure that combines multiple vertical beams 70V extending along the axial direction of the shaft 5 and multiple horizontal beams 70H along a cross section in the axial direction. Each vertical beam 70V is disposed spaced apart from each other between an upper end 70U and a lower end 70D. Each horizontal beam 70H is disposed perpendicular to each vertical beam 70V. The vertical beams 70V and the horizontal beams 70H form a lattice-like framework structure.

[0198] In this case, the main body 70A (detachable unit 70) also functions as a reinforcing member that reinforces the strength of the shaft 5 from the inner circumferential surface side. By reinforcing the strength of the shaft 5 with the main body 70A (detachable unit 70), the thickness of the circumferential surface of the shaft 5 (the circumferential surface surrounding the shaft hollow portion 9) can be reduced. This makes it easier for the shaft 5 to transmit vibrations, thereby strengthening the vibrations transmitted to the grip 6. As a variation of the main body 70A (detachable unit 70) shown in FIG. 31(B), the horizontal beam 70H may be omitted and the main body 70A may be configured with one or more vertical beams 70V. The shape of the main body 70A is not limited to the above-described framework structure, but may also be a tubular structure surrounded by walls. Furthermore, it is not limited to a cylindrical shape, but may also be a rectangular tube shape.

[0199] The detachable unit (detachable unit for tuning-fork sounding body) 71 shown in FIG. 31(C) has a tuning-fork sounding body 20S built into a hollow portion 71B of a main body 71A. The detachable unit 71 differs from the detachable unit 70 of FIG. 31(A) in that the main body 71A is provided within the shaft hollow portion 9, but otherwise shares the same configuration. The detachable unit 71 is shorter in the extension direction (axial and vertical directions) than the detachable unit 70 of FIG. 31(A). The extension direction dimension of the detachable unit 71 is set to correspond to the extension direction dimension of the tuning-fork sounding body 20S. In other words, the detachable unit 71 is built into at least the shaft hollow portion 9, since it is only necessary to accommodate the tuning-fork sounding body 20S. In contrast, the detachable unit 70 (FIG. 31(A)) extends from the shaft hollow portion 9 to the grip hollow portion 10 in order to transmit vibrations to the grip 6 via the vibration transmission member 20. A golf club equipped with the detachable unit 71 may have a shaft cavity 9 inside at least the shaft 5, in other words, it may or may not have a grip cavity 10 inside the grip 6. If the grip 6 has a grip cavity 10 inside, the detachable unit 71 may extend into the grip cavity 10 as shown by the dashed line in Figure 31(C).

[0200] The detachable units 70, 71 shown in Figures 31(A) to (C) are cylindrical and conform to the inner circumferential shape of the shaft hollow portion 9 (and the grip hollow portion 10), and can be said to be cartridge types that are inserted into and removed from the shaft hollow portion 9 (and the grip hollow portion 10). In this case, the golf clubs 1, 1' can be said to have a dual structure with the detachable units 70, 71 built in. Figures 31(D) and (E) show modified shapes of the detachable units 70, 71. The detachable units 70, 71 shown in Figure 31(D) are capsule-shaped with both the upper and lower ends formed into approximately hemispherical shapes. The detachable units 70, 71 shown in Figure 31(E) are modified capsule-shaped with the lower end (one end) curved and pointed more sharply than the upper end (the other end).

[0201] The detachable units 70, 71 shown in Figures 31(A) to (E) may be detachably attached with their lower ends in contact with the hosel 4, or may be housed in the shaft hollow 9 (and grip hollow 10) with a spaced apart upper than the hosel 4. The detachable units 70, 71 shown in Figures 31(A) to (E) may have their upper ends housed in the grip hollow 10 or the shaft hollow 9. The upper ends of the detachable units 70, 71 may be located at the upper ends of the grip hollow 10 or the shaft hollow 9, or may be housed below the upper ends of the grip hollow 10 or the shaft hollow 9. Furthermore, as shown in Figure 31(F), when a hosel cavity 8 is provided inside the hosel 4, the detachable units 70, 71 may extend into the hosel cavity 8.

[0202] The outer peripheral surfaces of the detachable units 70, 71 may or may not contact the inner peripheral surfaces of the shaft hollow portion 9 (and the grip hollow portion 10). If the outer peripheral surfaces of the detachable units 70, 71 do not contact the inner peripheral surfaces of the shaft hollow portion 9 (and the grip hollow portion 10), a resin ring may be provided on the outer peripheral surfaces of the detachable units 70, 71 to seal the gap between the detachable units 70, 71 and the inner peripheral surfaces of the shaft hollow portion 9 (and the grip hollow portion 10). The detachable units 70, 71 may incorporate various electrical devices 72, such as a pickup, amplifier, speaker, microphone, actuator, communication device, battery, motor, and vibration device (actuator). Of course, a golf club equipped with the detachable units 70, 71 may be used in the golf practice system S shown in FIG. 26 . Furthermore, in the various embodiments and modifications described above, the vibration transmission member 20 may be made of a conductive material. In this case, electrical signals and power can be transmitted to various electrical devices such as pickups, amplifiers, speakers, microphones, actuators, communication devices, batteries, and motors through the vibration transmission member 20. In the above-described embodiments and modifications, the shapes (neck shapes) of the hosel 4 and shaft 5 are not limited to those described above, and well-known shapes such as a straight neck, gooseneck, and crank neck can be freely applied. In the above-described embodiments and modifications, the golf club is not limited to a putter, and may be any type, such as an iron or a driver.

[0203] In the golf clubs 1, 1' of the above-described embodiments and modifications, the shape of the grip 6 is not limited to the shape shown in the drawings and may be any shape. Furthermore, in the golf clubs 1, 1', the shaft 5 and the grip 6 may be integrally formed. In this case, as shown in FIG. 32(A), the diameters of the shaft 5 and the grip 6 may be the same. Furthermore, the golf club 1, 1' shown in FIG. 32(B) has the same diameters of the shaft 5 and the grip 6, similar to the golf club 1, 1' shown in FIG. 32(A), and the grip 6 is provided with a grip member 6G that covers the periphery of the grip 6. Furthermore, as shown in FIG. 32(C), the diameter of the grip 6 may be larger than the diameter of the shaft 5. In this case, the grip 6 is easier to hold.

[0204] The grip member 6G is made of a material that fits softly to the user's hand. Specific examples include rubber (natural rubber), elastomer (resin material), fiber-reinforced plastic (FRP), ultrafine resin fibers, and metal. While FIG. 32(B) clearly shows the grip member 6G in comparison with FIG. 32(A), the grip member 6G may be provided on the grip 6 of the golf club 1 according to each of the above-described embodiments and modified examples. A net-like (mesh-like) net member (mesh member) made of resin fibers such as fiber-reinforced plastic or ultrafine resin fibers can be used as the grip member 6G made of fiber-reinforced plastic or ultrafine resin fibers. A specific example of a mesh member made of fiber-reinforced plastic or ultrafine resin fibers is a mesh member made by weaving strings made of fiber-reinforced plastic into a flat net (mesh-like). Another specific example is a mesh member made of ultrafine resin fibers intertwined in a three-dimensional manner. A sheet-like cover may be further provided around the net member (mesh member). In a golf club 1 having a grip member 6G using a mesh material, vibrations from the shaft 5 tend to be transmitted to the user's hand through the grip member 6G. This improves the feel on impact. Specifically, the grip member 6G is provided on the grip 6 of a golf club including an axially formed shaft 5, a head 3 provided at one end of the shaft 5 and having a striking surface 2 for striking a golf ball, and a grip 6 provided at the other end of the shaft 5 and held by the user. Here, the golf club 1, 1' having the grip member 6G may include the head 3, hosel 4, shaft 5, and grip, the grip 6 being formed integrally with the shaft 5, a shaft cavity 9 within the shaft 5 and a grip cavity 10 within the grip 6, a vibration transmission member 20 housed in a shaft cavity 9 within the shaft 5 and a grip cavity 10 within the grip 6, the lower end of the vibration transmission member 20 being fixed to the hosel 4, and an attachment member (a grip inner plate 23 and a grip inner fixture 24) within the grip cavity 10 connecting the upper end of the vibration transmission member 20 to the grip 6. In this case, vibrations caused by hitting the golf ball are transmitted to the grip 6 via the vibration transmission member 20, and these vibrations are more likely to be transmitted to the user's hand via the grip member 6G, thereby further improving the hitting feel.

[0205] The material used for the grip 6 may be rubber (natural rubber), elastomer (resin material), fiber-reinforced plastic (FRP), ultrafine resin fibers, metal, etc. Note that these materials are merely examples, and the materials used for the grip 6 and the grip member 6G are not limited to these. It goes without saying that a golf club equipped with the grip member 6G may also be used in the golf practice system S. The materials used for each part of the golf club 1, 1′ (head 3, hosel 4, shaft 5, grip 6) may be any material, such as various metals such as stainless steel, titanium, mild steel, bronze, aluminum, aluminum alloy, aluminum, and copper, as well as carbon, plastic, nanocellulose, carbon nanofiber, Japanese paper, leather, polyacetal, PET, glass, aluminum fiber, chemical fiber, resin, polypropylene, nanocellulose, polyester, etc.

[0206] Instead of the vibration transmission member 20 and the tuning-fork speaker 20S, a reinforcing member for reinforcing the strength of the shaft 5 may be built into the detachable units 70 and 71 shown in Figures 31(A) to 31(E). A truss-structured reinforcing member 73 is built into the detachable units 70 and 71 shown in Figure 32(D). Instead of the detachable units 70 and 71, a reinforcing member for reinforcing the strength of the shaft 5 may be built into the shaft cavity 9 of the shaft 5 (detachable unit for reinforcing member). A truss-structured reinforcing member 74 is built into the shaft cavity 9 of the shaft 5 shown in Figure 32(E). A golf club equipped with the detachable units 70 and 71 for the reinforcing member 74 may not have a grip cavity 10, i.e., it may have at least a shaft cavity 9 inside the shaft 5. Furthermore, the thickness (wall thickness) of the shaft 5 may be thinned to facilitate transmission of vibrations through the shaft 5 to the user's hand gripping the grip 6. In this case, it can be said that the shaft 5 itself functions as a vibration transmission member. Also, the shaft 5 may be provided with thick and thin portions in thickness (wall thickness), so that the thin portions ensure vibration transmission and the thick portions ensure strength.

[0207] In addition, the golf club 1, 1′ may be provided with the following various functions. The various functions may include an image system, a vital data detection function, a smartphone-mounted function, a smartphone function, a communication function, an AI function, a smart speaker function, a display function, a touch panel function, a speech function (conversation function), a GPS function, a beacon function, etc.

[0208] Regarding the display function using the above-mentioned liquid crystal display 102, one or more impact sensors 104 (see Figure 33) may be provided within the head 3, and when a golf ball hits the striking surface 2, the impact data may be detected by the impact sensors 104 and collected by the controller 100, and the impact data may be displayed on the liquid crystal display 102 as numerical values, graphs, etc.

[0209] For example, if both the rhythm box function and the display function are provided, a selector switch SW may be used to switch between the two functions, as shown in Fig. 33. In this case, when the switch SW is switched to connect to the liquid crystal display 102, the hitting direction and quantified and graphed impact data are displayed on the liquid crystal display 102, and when the switch SW is switched to connect to the speakers 96A, 96A', one of a rhythm sound and a synthetic voice generated by either the rhythm box function or the synthetic voice generation function of the controller 100 is output from the speakers 96A, 96A'. When the switch SW is switched to connect to both the liquid crystal display 102 and the speakers 96A, 96A', the hitting direction and quantified and graphed impact data are displayed on the liquid crystal display 102, and one of a rhythm sound and a synthetic voice is output from the speakers 96A, 96A'.

[0210] The movement of the weight member 61 described with reference to FIGS. 22A and 22B may be controlled using the user's smartphone. FIG. 34 is a processing block diagram illustrating a processing configuration for controlling the movement of the weight member 61 using the user's smartphone. The weight motor 62 is connected to a motor control unit 63 so as to be able to transmit and receive data. The motor control unit 63 is a computer device (control unit) for controlling the weight motor 62 so that the weight motor 62 moves the weight member 61. The motor control unit 63 is wirelessly connected to a smartphone 65 via a communication unit 64 so as to be able to communicate data. The smartphone 65 is a portable mobile terminal used by the user to instruct the movement of the weight member 61, and transmits and receives control signals between the smartphone 65 and the motor control unit 63 of the golf club 1. The smartphone 65 is provided with a touch-input display 65A. The display 65A functions as an input unit for inputting an instruction to move the weight member 61 to a desired position and also functions as a display unit for displaying on a monitor the position of the weight member 61 moved in response to the movement instruction. The wireless connection between the smartphone 65 and the motor control unit 63 may be based on a well-known wireless communication standard such as Bluetooth (registered trademark).

[0211] An example of control of movement of the weight member 61 using the smartphone 65 will be described. First, a connection is established between the smartphone 65 and the motor control unit 63. After the connection is established, the motor control unit 63 controls the weight motor 62 to move the weight member 61 to a predetermined initial position and provides the smartphone 65 with current position information of the weight member 61. After the weight member 61 has been moved to the predetermined initial position, the user can input a movement command for the weight member 61 from the smartphone 65. When the movement command is input from the smartphone 65, the motor control unit 63 controls the weight motor 62, which moves the weight member 61. Based on the current position information of the weight member 61 provided by the motor control unit 63, the smartphone 65 can monitor the display 65A and display an image indicating the position of the weight member 61 moved in response to the movement command. The user can check the current position of the weight member 61 and provide a command to move the weight member 61 on the display 65A of the smartphone 65.

[0212] When the user inputs a movement instruction to move the weight member 61 to a desired position from the smartphone 65, an instruction signal is transmitted from the smartphone 65 to the motor control unit 63. The motor control unit 63 controls the weight motor 62 based on the instruction signal to move the weight member 61. When the weight member 61 moves, position information of the weight member 61 is supplied to the smartphone 65 via the motor control unit 63, and the current position of the weight member 61 is updated on the display 65A of the smartphone 65. In this case, the position of the weight member 61 can be adjusted easily and visually easily using the smartphone 65. It goes without saying that such a golf club that allows the position of the weight member 61 to be adjusted using the smartphone 65 may be applied to the golf practice system S shown in FIG. 26 .

[0213] 35A and 35B, a golf club 1 equipped with the vibration transmission member 20 and auxiliary vibration transmission member 20Z may incorporate pickups 20P, 20ZP (first pickup 20P, second pickup 20ZP) for detecting these vibrations. The first pickup 20P is a sensor that detects the vibrations of the vibration transmission member 20 and converts them into an electrical signal, and is provided in close proximity to the vibration transmission member 20. Similarly, the second pickup 20PZ is a sensor that detects the vibrations of the auxiliary vibration transmission member 20Z and converts them into an electrical signal, and is provided in close proximity to the auxiliary vibration transmission member 20Z. These pickups 20P, 20PZ generate electrical signals corresponding to the vibrations of the vibration transmission members 20, 20Z, as in, for example, an electric guitar.

[0214] The golf club 1 shown in Figure 35 (A) comprises a shaft hollow portion 9, a grip hollow portion 10, a vibration transmission member 20, and a first pickup 20P. The vibration transmission member 20 is a member that transmits vibrations generated on the striking surface 2 to the grip 6. The vibration transmission member 20 is formed in an elongated shape and is provided inside the shaft hollow portion 9 and the grip hollow portion 10. The first pickup 20P is provided inside the grip hollow portion 10, near the vibration transmission member 20. A specific example of the vibration transmission member 20 is a wire (a linear member containing a magnetic material, such as steel wire or piano wire). The installation method of the vibration transmission member 20 is as described in the previous embodiment.

[0215] The golf club 1 also includes a hosel cavity 8, a shaft cavity 9, a vibration transmission member 20, an auxiliary vibration transmission member 20Z, and a second pickup 20ZP. Although not shown, the golf club 1 shown in FIG. 35(B) may also include a grip cavity 10 and a first pickup 20P. The auxiliary vibration transmission member 20Z transmits vibrations generated on the striking surface 2 to the vibration transmission member 20 and is provided inside the hosel cavity 8. The second pickup 20ZP is provided inside the hosel cavity 8 and near the auxiliary vibration transmission member 20Z. A specific example of the auxiliary vibration transmission member 20Z is a wire similar to that used for the vibration transmission member 20 (e.g., a linear member containing a magnetic material, such as a steel wire or piano wire). The vibration transmission members 20, 20Z are attached as described in the previous embodiment. The locations of the first pickup 20P and the second pickup 20ZP are not limited to the above locations, but may be anywhere near the vibration transmission member 20 and the auxiliary vibration transmission member 20Z.

[0216] As shown in FIG. 36 , the electrical signal detected by the first pickup 20P is amplified by an amplifier 90A built into the golf club 1 and transmitted to a speaker 90S. The electrical signal detected by the second pickup 20ZP may be amplified by the same amplifier 90A and transmitted to the speaker 90S. Alternatively, the signal may be amplified by an amplifier 90A' separate from the amplifier 90A, or the amplified electrical signal may be transmitted to a speaker 90S' separate from the speaker 90S. The speakers 90S, 90S' output the input electrical signal as sound. This generates a striking sound from the speakers 90S, 90S'. This striking sound can be adjusted by changing the amplification characteristics of the amplifiers 90A, 90A'. If necessary, filters may be inserted before or after the amplifiers 90A, 90A' to remove noise and unnecessary frequency components from the electrical signal.

[0217] In the golf club 1 shown in Figure 35(A), vibrations generated at the striking surface 2 of the head 3 are transmitted not only to the grip 6 via the hosel 4 and shaft 5, but also via the vibration transmission member 20. By incorporating the vibration transmission member 20 into the golf club 1, the vibrations of the striking surface 2 can be efficiently transmitted to the grip 6 without attenuation. This allows the user to enjoy a good hitting feel, an improvement over existing golf clubs. Furthermore, the vibrations of the vibration transmission member 20 are detected by the first pickup 20P, converted into an electrical signal, amplified by the amplifier 90A, and output as sound from the speaker 90S. This allows the impact sound to be output along with the impact feel, and the synergistic effect of these two elements provides the user with a good hitting feeling.

[0218] In the golf club 1 shown in Figure 35(B), in addition to the vibration transmission member 20, an auxiliary vibration transmission member 20Z is built into the hosel cavity 8. By building the auxiliary vibration transmission member 20Z into the hosel 4 in this way, vibrations generated on the striking surface 2 of the head 3 can be efficiently transmitted to the vibration transmission member 20 without attenuation, further improving the feel on impact. In addition, the vibrations of the auxiliary vibration transmission member 20Z are detected by the second pickup 20ZP, and sounds corresponding to these vibrations are output from the speakers 90S, 90S'. As a result, impact sounds are output along with the above-mentioned impact feel, and the synergistic effect of these two elements provides the user with a good impact feeling.

[0219] In particular, when the vibration transmission member 20 and auxiliary vibration transmission member 20Z are provided, the vibrations transmitted through the vibration transmission member 20 and auxiliary vibration transmission member 20Z are detected by the respective pickups 20P and 20ZP, and the electrical signals resulting from the respective vibrations are amplified by the amplifiers 90A and 90A', filtered as appropriate, and emitted as hitting sounds from the speakers 90S and 90S'. This provides the user with an even better hitting feeling.

[0220] A switch SW1 (shown by a dashed line in FIG. 36 ) may be provided in the circuit shown in FIG. 36 . The switch SW1 may be provided, for example, between the pickups 20P, 20ZP and the amplifiers 90A, 90A′, or between the amplifiers 90A, 90A′ and the speakers 9OS, 90S′. When the switch SW1 is on, sounds based on information detected by the pickups 20P, 20ZP or sensors are amplified by the amplifiers 90A, 90A′ and output from the speakers 9OS, 90S′. On the other hand, when the switch SW1 is off, no such sounds are output. The on / off state of the switch SW1 can be selected by the user. For example, the switch SW1 may be located so as to be operable from the exterior of the golf club 1. Alternatively, a switch SW1 capable of switching its on / off state via wireless communication may be used.

[0221] The golf club 1 shown in Figure 37(A) is a modified example of the golf club 1 shown in Figure 20(C). In the golf club 1 shown in Figure 37(A), the head 3 has a hollow head cavity 7 (fourth cavity) formed therein, and an internal-head vibration transmission member 3Z is tensioned in this head cavity 7. A first auxiliary vibration transmission member 20Z (auxiliary vibration transmission member) and a second auxiliary vibration transmission member 20Z' (auxiliary vibration transmission member) are provided in a hosel cavity 8 of the hosel 4. The lower end of the vibration transmission member 20 is connected to the first auxiliary vibration transmission member 20Z via a connecting portion 20K. The first auxiliary vibration transmission member 20Z and the second auxiliary vibration transmission member 20Z' are connected via a connecting portion 20K'. The second auxiliary vibration transmission member 20Z' and the internal-head vibration transmission member 3Z are connected via a connecting portion 20K''. With this golf club 1, vibrations generated when a golf ball is struck with the striking surface 2 of the head 3 are transmitted from the in-head vibration transmission member 3Z through the first auxiliary vibration transmission member 20Z and the second auxiliary vibration transmission member to the vibration transmission member 20, and then transmitted through the vibration transmission member 20 to the grip 6. Therefore, a good hitting feel can be provided to the user, and the hitting feel can be improved compared to existing golf clubs.

[0222] The golf club 1 shown in FIG. 37(B) is a modification of the golf club 1 shown in FIG. 20(A). The hosel 4 is a rectangular, flat plate with a hollow hosel cavity 8 (third cavity) formed therein. An auxiliary vibration transmission member 20Z is provided within the hosel cavity 8. The auxiliary vibration transmission member 20Z shown in FIG. 37(B) extends vertically, with its lower end attached to the head 3 and its upper end connected to the lower end of the vibration transmission member 20 via a connecting portion 20K. With this golf club 1, vibrations generated when the striking surface 2 of the head 3 strikes a golf ball are transmitted from the head 3 through the auxiliary vibration transmission member 20Z to the vibration transmission member 20, and then transmitted to the grip 6 via the vibration transmission member 20. This provides the user with a good feel, improving the feel of impact compared to existing golf clubs.

[0223] The golf club 1 shown in FIG. 37(C) is a modification of the golf club 1 shown in FIG. 37(B). The head 3 has a hollow head cavity 7 (fourth cavity) formed therein, and an internal vibration transmission member 3Z is tensioned within this head cavity 7. The lower end of the auxiliary vibration transmission member 20Z is connected to the internal vibration transmission member 3Z via a connecting portion 20K'. The vibration transmission member 20 is connected to the upper end of the auxiliary vibration transmission member 20Z via a connecting portion 20K. With this golf club 1, vibrations generated when the striking surface 2 of the head 3 strikes a golf ball are transmitted from the internal vibration transmission member 3Z through the auxiliary vibration transmission member 20Z to the vibration transmission member 20, and then to the grip 6 via the vibration transmission member 20. This provides the user with a better feel when hitting the ball, improving the feel compared to existing golf clubs. It goes without saying that the golf clubs described with reference to FIGS. 35 to 37 may also be applied to the golf practice system S shown in FIG. 26.

[0224] The golf club 1, 1' shown in Figure 38(A) is a modified version of the golf club 1, 1' shown in Figure 31(A) and is a configuration example in which a detachable unit 70 is attached to a golf club that does not have a hosel. The golf club 1, 1' shown in Figure 38(A) has a head 3, a shaft 5, and a grip 6. The shaft 5 has a shaft hollow portion 9 therein, and the grip 6 has a grip hollow portion 10 therein. A main body 70A of the detachable unit 70 is built into the shaft hollow portion 9 and the grip hollow portion 10. The main body 70A of the detachable unit 70 is fixed at its lower end (one end) to the head 3 and at its upper end (the other end) to a grip upper end plate 21 inside the grip 6. A vibration transmission member 20 is provided within the hollow portion 70B of the detachable unit 70. In other words, the configuration of the golf club 1, 1' shown in Figure 38(A) is the same as that of the golf club 1, 1' shown in Figure 31(A) except that it does not have a hosel. The lower end of the main body 70A may be disposed above and spaced apart from the head 3.

[0225] The golf club 1, 1' shown in Figure 38(B) is a modified version of the golf club 1, 1' shown in Figure 31(C) and is a configuration example in which a detachable unit 71 is attached to a golf club that does not have a hosel. The golf club 1, 1' shown in Figure 38(B) has a head 3, a shaft 5, and a grip 6. The shaft 5 has a shaft hollow portion 9 therein, and the grip 6 has a grip hollow portion 10 therein. A main body portion 71A of the detachable unit 71 is built into the shaft hollow portion 9. A tuning-fork sounding body 20S is provided within the hollow portion 71B of the detachable unit 71. In other words, the configuration of the golf club 1, 1' shown in Figure 38(B) is the same as that of the golf club 1, 1' shown in Figure 31(C) except that it does not have a hosel. Note that Figure 38(B) shows a configuration example in which the lower end of the main body portion 70A is fixed to the head 3, but the lower end of the main body portion 70A may be positioned above and spaced apart from the head 3. As shown by the dashed line in Figure 38(B), the detachable unit 71 may extend into the grip hollow portion 10. Furthermore, in the detachable units 70, 71 shown in Figures 38(A) and (B), a reinforcing member 73 shown in Figure 32(D) may be built in instead of the vibration transmission member 20 and tuning-fork speaker 20S (detachable unit with reinforcing member). In this case, the shaft 5 can also be reinforced by the detachable units 70, 71 with the built-in reinforcing member 73.

[0226] The following appendices are disclosed regarding the above embodiments. <Vibration Transmission Member in Hosel> [Appendix 1] A golf club comprising: a head having a striking surface for striking a golf ball, an axial shaft, a hosel connecting one end of the shaft to the head, and a grip attached to the other end of the shaft and held by a user, wherein the hosel is formed integrally with the head and the shaft in an irreplaceable manner, the shaft having a hollow first cavity therein, the grip having a hollow second cavity therein communicating with the first cavity, the grip being formed integrally with the shaft, a vibration transmission member formed elongated, one end of which is fixed to the hosel, the vibration transmission member being housed in the first cavity and the second cavity and transmitting vibrations generated at the striking surface to the grip, and an attachment member provided inside the second cavity and connecting the other end of the vibration transmission member to the grip. <Flat hosel> [Appendix 2] The golf club according to Appendix 1, characterized in that the hosel is made of a solid material having a rectangular, flat, solid cross-section. <Crank hosel> [Appendix 3] The golf club according to Appendix 1, characterized in that the hosel has two bends in the middle and is made of a solid material having a solid cross-section. <Flat hollow hosel> [Appendix 4] The golf club according to Appendix 1, characterized in that the hosel is a rectangular, flat, solid hosel having a third hollow cavity therein. <Crank hollow hosel> [Appendix 5] The golf club according to Appendix 1, characterized in that the hosel has two bends in the middle and is a third hollow cavity therein. <Winding device> [Supplementary Note 6] The golf club according to Supplementary Note 1, characterized in that the mounting member has a winding device that manually or electrically winds up the other end of the vibration transmission member, and a pinion that meshes with a rack fixed to the inner circumferential surface of the second hollow portion and is attached rotatably relative to the winding device. <Built-in vibration sensor> [Supplementary Note 7]The golf club according to Supplementary Note 1, wherein the hosel has a built-in vibration sensor that detects vibrations generated on the striking surface. <Built-in Vibration Device> [Supplementary Note 8] The golf club according to Supplementary Note 7, wherein the hosel is equipped with a vibration device that vibrates based on information detected by the vibration sensor, and is configured so that vibrations from the vibration device are transmitted to the vibration transmission member. <Built-in Speaker> [Supplementary Note 9] The golf club according to Supplementary Note 7, wherein the hosel has a built-in speaker that emits sound or another vibration device that vibrates based on information detected by the vibration sensor. <Type of Vibration Transmission Member> [Supplementary Note 10] The golf club according to Supplementary Note 1, wherein the vibration transmission member is formed of any one of a wire, a string, a rod member, a linear elastic member, and a long coil spring, or a combination of any of the wire, string, rod member, linear elastic member, and long coil spring. <Attachment Member in Membrane Shape> [Supplementary Note 11] The golf club according to Supplementary Note 1, wherein the attachment member is formed in the shape of a membrane that unfolds in a direction intersecting the extension direction of the grip. <With Mass Member> [Appendix 12] The golf club of Appendix 1, characterized in that the vibration transmission member has a mass member for amplifying vibration. <Auxiliary Vibration Transmission Member> [Appendix 13] The golf club of Appendix 4, characterized in that it comprises an auxiliary vibration transmission member provided inside the third cavity for transmitting vibrations generated on the striking surface to the vibration transmission member. [Appendix 14] The golf club of Appendix 5, characterized in that it comprises an auxiliary vibration transmission member provided inside the third cavity for transmitting vibrations generated on the striking surface to the vibration transmission member. <Head Formed Hollow> [Appendix 15] The golf club of Appendix 1, characterized in that the head has a fourth cavity formed hollow therein. <Weight Attached to Head> [Appendix 16] The golf club of Appendix 1, characterized in that the head comprises a weight member for changing the position of the center of gravity of the head. <Details of the Weight> [Supplementary Note 17] The weight member is provided inside a hollow cylindrical recess formed in the upper surface of the head, and a drive source that moves the weight member;and a control unit that controls the drive source so that the drive source rotates the weight member along the inner circumferential surface of the recess. <Rhythm Box Function> [Supplementary Note 18] The golf club of Supplementary Note 1, further comprising: a controller having a rhythm box function that notifies the player of the rhythm when the golf ball is hit; and a speaker that outputs one of a rhythm sound generated by either the rhythm box function or the synthetic voice generation function of the controller or a synthetic voice. <Head Adapter> [Supplementary Note 19] The golf club of Supplementary Note 1, further comprising: an adapter that is detachably attached to the underside of the head and is suited to the player's physique and hitting form. <Transmitter> [Supplementary Note 20] The golf club of Supplementary Note 8 or Supplementary Note 9, further comprising: a transmitter that transmits a signal from the vibration sensor to the outside. <Hosel Opening> [Supplementary Note 21] The golf club of Supplementary Note 4, further comprising: an opening that connects the internal space of the third hollow portion with the outside and transmits reverberant sounds within the hosel to the outside of the hosel. [Appendix 22] The golf club according to Appendix 4 or Appendix 21, wherein the hosel communicates the internal space of the third cavity with the outside, and has a covered inspection window for the vibration transmission member inside the hosel. [Appendix 23] The golf club according to Appendix 22 which cites Appendix 21, wherein the inspection window also serves as the opening for transmitting reverberation within the hosel to the outside of the hosel. [Appendix 24] The golf club according to Appendix 5, wherein the hosel communicates the internal space of the third cavity with the outside, and has an opening for transmitting reverberation within the hosel to the outside of the hosel. [Appendix 25] The golf club according to Appendix 5 or Appendix 24, wherein the hosel communicates the internal space of the third cavity with the outside, and has a covered inspection window for the vibration transmission member inside the hosel. [Supplementary Note 26] The golf club according to Supplementary Note 25, which refers to Supplementary Note 24, characterized in that the inspection window also serves as the opening for transmitting reverberation within the hosel to the outside of the hosel. [Supplementary Note 27]The golf club according to Supplementary Note 1, characterized in that it has a covered inspection window for the vibration transmission member in the shaft or the grip, which connects the internal space of the first hollow portion or the internal space of the second hollow portion with the outside. <Multiple Vibration Transmission Members> [Supplementary Note 28] The golf club according to Supplementary Note 1, characterized in that a plurality of the vibration transmission members are provided. <Multiple Mounting Members> [Supplementary Note 29] The golf club according to Supplementary Note 28, characterized in that a plurality of the mounting members are provided corresponding to each of the plurality of vibration transmission members. [Supplementary Note 30] The golf club according to Supplementary Note 6, characterized in that a plurality of the vibration transmission members are provided, and a plurality of the mounting members are provided corresponding to each of the plurality of vibration transmission members. <Mounting Plate for Vibration Transmission Member> [Supplementary Note 31] The golf club according to Supplementary Note 28, characterized in that the mounting member is formed of a disk-shaped grip-side plate extending along a plane intersecting the extending direction of the vibration transmission members, and the grip-side plate is provided with a plurality of connecting holes for connecting each of the plurality of vibration transmission members. [Appendix 32] The golf club according to appendix 28 or 31, characterized in that the one end of each of the plurality of vibration transmission members is fixed to the hosel via a disc-shaped hosel side plate extending along a plane intersecting the extending direction of the vibration transmission members, and the hosel side plate is provided with a plurality of connecting holes connecting each of the plurality of vibration transmission members. <Tuning-fork type sounding body> [Appendix 33] A golf club comprising: a head having a striking surface for striking a golf ball, an axially formed shaft, a hosel connecting one end of the shaft to the head, and a grip provided on the other end of the shaft and held by a user, wherein the hosel is formed integrally with the head and the shaft in an irreplaceable state, the shaft has a first hollow cavity therein, and the grip has a second hollow cavity therein that is connected to the first cavity, and the grip is formed integrally with the shaft,A golf club comprising: a tuning-fork-type sounding body, one end of which is fixed to the hosel, housed in at least the first hollow portion, and vibrating upon impact with the striking surface of the golf ball to produce sound. [Appendix 34] The golf club according to Appendix 33, wherein the one end of the tuning-fork-type sounding body is fixed to the hosel via a vibration transmission member. [Appendix 35] The golf club according to Appendix 33 or 34, wherein the other end of the tuning-fork-type sounding body is provided with an attachment member that is provided inside the second hollow portion and connects the other end to the grip via the vibration transmission member, and the attachment member has a winding device that winds up the vibration transmission member manually or electrically, and a pinion that meshes with a rack fixed to the inner circumferential surface of the second hollow portion and is attached rotatably relative to the winding device. <Cartridge / capsule containing vibration transmission member> [Supplementary Note 36] A removable unit for a vibration transmission member, characterized in that it is detachably attached to a golf club, the golf club comprising: a head having a striking surface for striking a golf ball, an axial shaft, a hosel connecting one end of the shaft to the head, and a grip provided at the other end of the shaft and held by a user, the shaft having a hollow first cavity therein, and the grip having a hollow second cavity therein and communicating with the first cavity; a main body portion that is housed in the first cavity and the second cavity, extends in the axial direction of the shaft, has a cylindrical shape that follows the inner circumferential shapes of the first cavity and the second cavity, and has a hollow hollow therein; and a vibration transmission member that is formed in an elongated shape, has one end fixed to a lower end of the main body, is housed in the hollow cavity, and transmits vibrations generated at the striking surface to the grip. [Supplementary Note 37] A golf club is detachably attached to a golf club, the golf club comprising: a head having a striking surface for striking a golf ball; a shaft formed in an axial shape; and a grip provided at the other end of the shaft and held by a user, the shaft having a first hollow cavity therein, and the grip having a second hollow cavity therein communicating with the first hollow cavity,a main body portion that is housed in the first hollow portion and the second hollow portion, extends in the axial direction of the shaft, has a cylindrical shape that conforms to the inner circumferential shapes of the first hollow portion and the second hollow portion, and has a hollow portion formed therein; and a vibration transmission member that is formed in an elongated shape, has one end fixed to a lower end of the main body portion, is housed in the hollow portion, and transmits vibrations generated on the striking surface to the grip. <Cartridge / capsule containing tuning-fork-type sounding body> [Appendix 38] A removable unit for a tuning-fork-type sounding body, comprising: a head having a striking surface for striking a golf ball, an axial shaft, a hosel connecting one end of the shaft to the head, and a grip provided on the other end of the shaft to be held by a user, the shaft being detachably attached to a golf club having a hollow first cavity therein; a main body portion housed in the first cavity, extending in the axial direction of the shaft and having a cylindrical shape that follows the inner circumferential shape of the first cavity, and having a hollow therein; and a tuning-fork-type sounding body that is formed elongated, has one end fixed to the lower end of the main body, is housed in the hollow cavity, and vibrates due to the impact of striking the golf ball with the striking surface, thereby emitting sound. [Supplementary Note 39] A removable unit for a tuning fork-type sounding body, comprising: a head having a striking surface for striking a golf ball, an axial shaft, and a grip provided at the other end of the shaft to be held by a user, the shaft being detachably attached to a golf club having a hollow first cavity therein, the main body being housed in the first cavity, extending in the axial direction of the shaft, having a cylindrical shape that follows the inner circumferential shape of the first cavity, and having a hollow therein, and a tuning fork-type sounding body having an elongated shape, one end of which is fixed to the lower end of the main body, housed in the hollow cavity, and vibrating in response to the impact of striking the golf ball with the striking surface to produce sound. <Cartridge / capsule containing a reinforcing member> [Supplementary Note 40]a reinforcing member detachable unit comprising: a head having a striking surface for striking a golf ball, an axial shaft, a hosel connecting one end of the shaft to the head, and a grip provided at the other end of the shaft to be held by a user, the reinforcing member detachable unit being detachably attached to a golf club having a hollow first cavity therein; a main body portion housed in the first cavity, extending in the axial direction of the shaft and having a cylindrical shape that follows the inner circumferential shape of the first cavity, and having a hollow portion therein; and a reinforcing member housed in the hollow portion to reinforce the strength of the shaft. [Appendix 41] A detachable unit for a reinforcing member, comprising: a head having a striking surface for striking a golf ball, an axially formed shaft, and a grip provided at the other end of the shaft to be held by a user, the shaft being detachably attached to a golf club having a hollow first cavity portion therein; a main body portion housed in the first cavity portion, extending in the axial direction of the shaft and having a cylindrical shape that follows the inner circumferential shape of the first cavity portion, and having a hollow portion therein; and a reinforcing member housed in the hollow portion to reinforce the strength of the shaft. <Golf Practice System> [Supplementary Note 42] A cup provided on the rolling surface (golf ball rolling surface) of a golf ball hit by a golf club according to Supplementary Note 1 or 33, or a golf club equipped with a detachable unit according to any one of Supplements 36 to 41; A hitting area spaced from the cup and having the golf ball rolling surface; A rod-shaped pin that is inserted into and removed from the cup and serves as a marker for the cup; A first illuminator attached to the pin and irradiates a guide laser beam that indicates a straight line from the pin toward the hitting area; A first light receiver attached to the golf club and capable of receiving the guide laser beam from the first illuminator; A second illuminator attached to the golf club and irradiates a guide sub-laser beam from the golf club toward the pin; A second light receiver attached to the pin and capable of receiving the guide sub-laser beam from the second illuminator.a display that displays, when the first light receiver receives the guide laser light and the second light receiver receives the guide sub-laser light, a message to that effect. [Supplementary Note 43] A golf training machine having a cup provided on the rolling surface (golf ball rolling surface) of a golf ball hit by a golf club according to Supplementary Note 1 or 33, or a golf club equipped with a detachable unit according to any one of Supplements 36 to 41, and a hitting area spaced apart from the cup and having the golf ball rolling surface, wherein a user standing in the hitting area hits the golf ball with the golf club toward the cup; a cup unit attached to the cup, the cup unit having first detection means for detecting cup-in information of the golf ball and a first transmission device for transmitting the cup-in information to an external device; a pin unit attached to a rod-shaped pin that marks the cup, the pin unit having first image capturing means for capturing an image from the pin toward the hitting area, a second transmission device for transmitting first image data captured by the first image capturing means to an external device, and a first irradiator for irradiating a guide laser beam from the pin toward the hitting area; a club unit including: a vibration detection means attached to the golf club used by the user in the hitting area and detecting vibration information related to the vibration transmitted by the vibration transmission member; a second detection means built into the head and detecting impact information related to the impact of the golf ball; a second imaging means for capturing an image forward from the head; a second irradiator for irradiating a guide sub-laser light forward from the head; and a third transmission device for transmitting the vibration information, the impact information, and second image data captured by the second imaging means to an external device; a control unit including: a first receiving device for receiving, as monitor information, at least one of the cup-in information transmitted from the first transmitting device, the first image data transmitted from the second transmitting device, and the vibration information, the impact information, and the second image data transmitted from the third transmitting device; a control device for generating guide information for providing guidance for the user's golf play based on the monitor information; and a fourth transmitting device for transmitting the guide information to an external device.A golf practice system comprising: a second receiving device that receives the guide information transmitted from the fourth transmitting device; and a presenter that presents guidance for golf play based on the guide information, and a terminal device portable by the user. [Appendix 44] A golf club grip comprising: a shaft formed in an axial shape; a head provided at one end of the shaft and having a striking surface for striking a golf ball; and a grip provided at the other end of the shaft and held by a user, wherein the grip is provided with a grip member made of a mesh member formed by molding resin fibers into a net shape. [Appendix 45] A golf club according to Appendix 1, characterized in that an electric display member is provided on the top surface of the head. [Appendix 46] A golf club according to Appendix 45, characterized in that the display member is a liquid crystal display that can display at least one piece of information selected from the launch direction of the golf ball and impact data when the golf ball hits the striking surface in response to an external command. [Appendix 47] The golf club according to Appendix 1, characterized in that the vibration transmission member contains a magnetic material, and a first pickup that detects vibrations transmitted by the vibration transmission member and converts them electrically is provided in the vicinity of the vibration transmission member. [Appendix 48] The golf club according to Appendix 13 or 14, characterized in that the auxiliary vibration transmission member contains a magnetic material, and a second pickup that detects vibrations transmitted by the auxiliary vibration transmission member and converts them electrically is provided in the vicinity of the auxiliary vibration transmission member. [Appendix 49] The golf club according to Appendix 16, characterized in that the weight member is provided inside a linear recess formed in the top surface of the head, and the golf club comprises: a drive source that moves the weight member; and a control unit that controls the drive source so that the drive source slides the weight member along the inner circumferential surface of the recess. [Appendix 50] A portable mobile terminal that exchanges control signals with the control unit of the golf club according to Appendix 17 or 49, comprising: an input unit that inputs an instruction to move the weight member to a desired position;and a display unit that displays on a monitor the position of the weight member that has been moved in response to the movement instruction from the input unit. [Supplementary Note 51] The golf club according to Supplementary Note 13, wherein the head has a fourth hollow cavity therein, and an internal-head vibration transmission member that is provided inside the fourth cavity and transmits vibrations generated on the striking surface to the auxiliary vibration transmission member. [Supplementary Note 52] The golf club according to Supplementary Note 14, wherein the head has a fourth hollow cavity therein, and an internal-head vibration transmission member that is provided inside the fourth cavity and transmits vibrations generated on the striking surface to the auxiliary vibration transmission member.

[0227] DESCRIPTION OF SYMBOLS 1 Golf club (putter) 2 Striking surface (face) 3 Head 3A, 3B Adapter 4 Hosel 4A Crank-shaped hosel 4B Flat hosel 5 Shaft 6 Grip 7 Head cavity (fourth cavity) 8 Hosel cavity (third cavity) 9 Shaft cavity (first cavity) 10 Grip cavity (second cavity) 20 Vibration transmission member 20X Auxiliary vibration transmission member 21 Grip upper end plate 22 Fixing member 23 Grip inner plate (mounting member) 24 Grip inner fixing member (mounting member) 26 Mass member 27U Upper mounting member (grip side plate) 27D Lower mounting member (hosel side plate) 28D Connecting hole 28U Connecting hole 20S Tuning fork-shaped sounding body 41, 41′ Rack 42, 42′ Pinion 43, 43' Motor 44, 44' Winding device 61 Weight member 62 Weight motor (driving source) 70 Cartridge type detachable unit 71 Capsule type detachable unit 80, 80A, 80B Opening 81, 81A, 81B Lid 90, 92 Opening 91, 93 Lid 95, 95' Vibration sensor 96, 96' : Vibration device 96A,96A': Speaker 97 Vibration device 97A Speaker 100 Controller 101 Transmitter 102 Liquid crystal display 200 Cup unit 201 First control device 202 First sensor (first detection means) 203 First communication device (first transmission device) 205 Camera 206 Acoustic device 207 Lighting device 208 Laser irradiator 300 Control unit 301 Control device 302 Receiving device (first transmission device) 303 Transmitting device (fourth transmission device) 304 Storage device 400 Terminal device 401 Fourth control device 402 Display (presenter) 403 Fourth communication device (second reception device) 404 Input device 405 Acoustic device 406 Camera 500 Pin unit 501 Second control device 502 First camera (first photographing means) 503 Second communication device (second transmission device) 504 First illuminator 505 Second light receiver 506 Acoustic device 507 Lighting device 508 Sensor 600 Photography unit 601 Communication device 602 Camera 700 Club unit 701 Third control device 702 Second camera (second photography means) 703 Third communication device (third transmission device) 704 Second sensor (second detection means) 705 Second illuminator (second illuminator) 706 Display device 707 Acoustic device 708 First light receiver 709 Lighting device 710 Vibration sensor (vibration detection means) 800 Electronic scoreboard 801 Control device 802 Display device 803 Communication device 804 Input device 805 Acoustic device 806 Camera 807 Sensor 808 Lighting device 901 Control device 902 Display device 903 Communication device 904 Input device 905 Sound device 906 Camera 907 Sensor 908 Lighting device S Golf practice system T Practice machine T Golf practice machine T1 Cup area T2 Hitting area,

Claims

1. a head having a striking surface for striking a golf ball; a shaft formed in an axial shape; a hosel connecting one end of the shaft and the head; a grip provided at the other end of the shaft and held by a user; the hosel is integrally formed with the head and the shaft in a non-replaceable manner; The shaft has a first hollow portion formed therein, The grip has a second hollow portion formed therein and communicating with the first hollow portion, The grip is integrally formed with the shaft, a vibration transmission member formed in an elongated shape, one end of which is fixed to the hosel, which is housed in the first cavity and the second cavity, and which transmits vibrations generated on the striking surface to the grip; an attachment member provided inside the second hollow portion and connecting the other end of the vibration transmission member to the grip; the mounting member has a winding device that manually or electrically winds up the other end of the vibration transmission member, and a pinion that meshes with a rack fixed to the inner circumferential surface of the second hollow portion and is rotatably attached to the winding device. A golf club characterized by:

2. 2. The golf club of claim 1, wherein the hosel is constructed of a solid material having a rectangular, flat, and solid cross section.

3. 2. The golf club according to claim 1, wherein the hosel is made of a solid material having two bent portions in the middle and a solid cross section.

4. 2. The golf club according to claim 1, wherein the hosel is a rectangular flat plate having a third hollow cavity formed therein.

5. 2. The golf club according to claim 1, wherein the hosel has two bent portions in a middle portion thereof and a third hollow portion formed therein.

6. 2. The golf club according to claim 1, wherein the hosel incorporates a vibration sensor for detecting vibrations generated on the striking surface.

7. 7. The golf club according to claim 6, wherein the hosel is provided with a vibration device that vibrates based on information detected by the vibration sensor, and is configured so that vibrations from the vibration device are transmitted to the vibration transmission member.

8. 7. The golf club according to claim 6, wherein the hosel incorporates another vibration device that vibrates or a speaker that emits sound based on the information detected by the vibration sensor.

9. 2. The golf club according to claim 1, wherein the vibration transmission member is composed of one of a wire, a string, a rod member, a linear elastic member, and a long coil spring, or a combination of the wire, string, rod member, linear elastic member, and long coil spring.

10. 2. The golf club according to claim 1, wherein the mounting member is formed in a film shape that extends in a direction intersecting the extending direction of the grip.

11. 2. The golf club of claim 1, wherein the vibration transmission member has a mass member for amplifying vibrations.

12. 5. The golf club according to claim 4, further comprising an auxiliary vibration transmission member provided inside the third cavity for transmitting vibrations generated on the striking surface to the vibration transmission member.

13. 6. The golf club according to claim 5, further comprising an auxiliary vibration transmission member provided inside the third cavity for transmitting vibrations generated on the striking surface to the vibration transmission member.

14. 2. The golf club according to claim 1, wherein the head has a fourth hollow cavity formed therein.

15. 2. The golf club according to claim 1, wherein the head has a weight member for changing the position of the center of gravity of the head.

16. the weight member is provided inside a hollow cylindrical recess formed in the top surface of the head, a drive source that moves the weight member; a control unit that controls the drive source so that the drive source rotates the weight member along the inner circumferential surface of the recess.

16. The golf club of claim 15.

17. 2. The golf club of claim 1, further comprising: a controller having a rhythm box function for providing rhythm when the golf ball is hit; and a speaker for outputting one of a rhythm sound and a synthetic voice generated by either the rhythm box function or the synthetic voice generation function of the controller.

18. 2. The golf club according to claim 1, wherein an adapter adapted to the user's physique and hitting form is detachably attached to the underside of the head.

19. 9. The golf club according to claim 7, further comprising a transmitter for transmitting a signal from said vibration sensor to an outside.

20. 5. The golf club according to claim 4, wherein the hosel has an opening that connects the internal space of the third cavity with the outside and transmits reverberation within the hosel to the outside of the hosel.

21. 21. The golf club according to claim 4 or claim 20, wherein the hosel has a covered inspection window that connects the internal space of the third cavity with the outside and is for the vibration transmission member within the hosel.

22. 22. The golf club according to claim 21, which relies on claim 20, wherein the inspection window also serves as the opening for transmitting reverberation within the hosel to the outside of the hosel.

23. 6. The golf club according to claim 5, wherein the hosel has an opening that connects the internal space of the third cavity with the outside and transmits reverberation within the hosel to the outside of the hosel.

24. 24. The golf club according to claim 5 or claim 23, wherein the hosel has a covered inspection window that connects the internal space of the third cavity with the outside and is for the vibration transmission member within the hosel.

25. 25. The golf club according to claim 24, which relies on claim 23, wherein the inspection window also serves as the opening for transmitting reverberation within the hosel to the outside of the hosel.

26. 2. The golf club according to claim 1, further comprising a covered inspection window for the vibration transmission member in the shaft or the grip, the inspection window connecting the internal space of the first cavity portion or the internal space of the second cavity portion with the outside.

27. A plurality of the vibration transmission members are provided.

2. The golf club according to claim 1.

28. A plurality of the mounting members are provided corresponding to the plurality of vibration transmission members, respectively.

28. The golf club of claim 27.

29. A plurality of the vibration transmission members are provided, A plurality of the mounting members are provided corresponding to the plurality of vibration transmission members, respectively.

2. The golf club according to claim 1.

30. the mounting member is formed of a disk-shaped grip-side plate extending along a plane intersecting an extension direction of the vibration transmission member, The grip-side plate is provided with a plurality of connecting holes for connecting the plurality of vibration transmission members to each other.

28. The golf club of claim 27.

31. the one end of each of the plurality of vibration transmission members is fixed to the hosel via a disk-shaped hosel-side plate extending along a plane intersecting an extending direction of the vibration transmission members, The hosel-side plate is provided with a plurality of connecting holes that connect the plurality of vibration transmission members to each other.

31. The golf club according to claim 27 or 30.

32. a head having a striking surface for striking a golf ball; a shaft formed in an axial shape; a hosel connecting one end of the shaft and the head; a grip provided at the other end of the shaft and held by a user; the hosel is integrally formed with the head and the shaft in a non-replaceable manner; The shaft has a first hollow portion formed therein, The grip has a second hollow portion formed therein and communicating with the first hollow portion, The grip is integrally formed with the shaft, a tuning fork-type sound generating body, one end of which is fixed to the hosel, which is housed in at least the first hollow portion, and which vibrates in response to the impact of striking the golf ball with the striking surface to generate sound; an attachment member is provided at the other end of the tuning-fork-type sounding body, the attachment member being provided inside the second hollow portion and connecting the other end to the grip via a vibration transmission member; The mounting member has a winding device that manually or electrically winds up the vibration transmission member, and a pinion that meshes with a rack fixed to the inner circumferential surface of the second hollow portion and is rotatably attached to the winding device. A golf club characterized by:

33. The one end of the tuning fork-type sounding body is fixed to the hosel via a vibration transmission member.

33. The golf club of claim 32.

34. a cup provided on the rolling surface of a golf ball (golf ball rolling surface) hit by the golf club according to claim 1 or 32; a hitting area spaced apart from the cup and having the golf ball rolling surface; a rod-shaped pin that is inserted into and removed from the cup and serves as a marker for the cup; a first irradiator attached to the pin for irradiating a guide laser beam in a straight line from the pin toward the hitting area; a first light receiver attached to the golf club and capable of receiving the guide laser light from the first irradiator; a second irradiator attached to the golf club and irradiating a guide sub-laser beam from the golf club toward the pin; a second light receiver attached to the pin and capable of receiving the guide sub-laser light from the second irradiator; and an indicator that indicates that the first light receiver receives the guide laser beam and the second light receiver receives the guide sub-laser beam. A golf practice system characterized by:

35. a golf training machine including a cup provided on a rolling surface of a golf ball (golf ball rolling surface) hit by the golf club according to claim 1 or 32, and a hitting area spaced apart from the cup and having the golf ball rolling surface, wherein a user standing in the hitting area hits the golf ball with the golf club toward the cup; a cup unit attached to the cup, the cup unit having a first detecting means for detecting cup-in information of the golf ball and a first transmitting device for transmitting the cup-in information to an external device; a pin unit having a first image capturing means attached to a rod-shaped pin that serves as a marker for the cup, capturing an image from the pin toward the hitting area, a second transmission device that transmits the first image data captured by the first image capturing means to an external device, and a first irradiator that irradiates a guide laser beam from the pin toward the hitting area; a club unit including: a vibration detection means attached to the golf club used by the user in the hitting area and detecting vibration information related to the vibration transmitted by the vibration transmission member; a second detection means built into the head and detecting impact information related to the impact of the golf ball; a second imaging means for capturing an image forward from the head; a second irradiator for irradiating a guide sub-laser light forward from the head; and a third transmission device for transmitting the vibration information, the impact information, and second image data captured by the second imaging means to an external device; a control unit including: a first receiving device that receives, as monitor information, the cup-in information transmitted from the first transmitting device, the first video data transmitted from the second transmitting device, and at least one of the vibration information, the impact information, and the second video data transmitted from the third transmitting device; a control device that generates guide information for providing guidance for the user's golf play based on the monitor information; and a fourth transmitting device that transmits the guide information to an external device; a terminal device portable by the user, the terminal device having a second receiving device that receives the guide information transmitted from the fourth transmitting device, and a presenter that presents a guide for playing golf based on the guide information; A golf practice system comprising:

36. 2. The golf club according to claim 1, wherein an electric indicator is provided on the top surface of said head.

37. 36. The golf club of claim 35, wherein the display member is a liquid crystal display capable of displaying at least one piece of information of the launch direction of the golf ball and impact data when the golf ball hits the striking surface in response to an external instruction.

38. The vibration transmission member is configured to contain a magnetic material, 2. The golf club according to claim 1, further comprising a first pickup disposed adjacent to said vibration transmitting member for detecting and converting the vibration transmitted by said vibration transmitting member into an electrical signal.

39. the auxiliary vibration transmission member is configured to contain a magnetic material, 14. The golf club according to claim 12, further comprising a second pickup disposed adjacent to said auxiliary vibration transmission member for detecting vibration transmitted by said auxiliary vibration transmission member and converting the detected vibration into an electrical signal.

40. the weight member is provided inside a linear recess formed in the top surface of the head, a drive source that moves the weight member; a control unit that controls the drive source so that the drive source slides the weight member along the inner circumferential surface of the recess.

16. The golf club of claim 15.

41. A portable mobile terminal for transmitting and receiving control signals to and from the control unit of the golf club according to claim 16 or 40, an input unit for inputting an instruction to move the weight member to a desired position; a display unit that monitors and displays the position of the weight member that has been moved in response to the movement instruction from the input unit. A portable mobile terminal characterized by:

42. the head has a fourth hollow portion formed therein, 13. The golf club according to claim 12, further comprising an internal vibration transmission member provided inside the fourth cavity for transmitting vibrations generated on the striking surface to the auxiliary vibration transmission member.

43. the head has a fourth hollow portion formed therein, 14. The golf club according to claim 13, further comprising an internal vibration transmission member provided inside the fourth cavity for transmitting vibrations generated on the striking surface to the auxiliary vibration transmission member.