JPH1176459A - Golf ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce lowering in flexibility and elasticity due to repeated application of hitting so as to improve durability by providing an internal structure, which includes a part containing amorphous material selected from metal, alloy, and carbon fiber partially at least, and providing a cover layer covering the outer circumferential face of the internal structure. SOLUTION: A golf ball 31 is constructed of a shell body 32, which is provided with a hollow structure and is formed of amorphous metal, alloy or carbon fiber, and an outside cover layer 32 covering the outer circumferential face of the shell body 32. In the outer circumferential face of the outside cover layer 33, multiple dimples are formed and paint is applied. In this case, as the metal to be used, zirconium, titanium, aluminum, nickel, iron, manganese, copper, molybdenum, cobalt, tungsten, beryllium, and magnesium are included, and the alloy contains at least one substance in these metals as a principal component. The shell body 32 is provided with an outside diameter of 33-47 mm and a thickness of 0.8-9 mm, while the cover layer 33 is formed so as to be provided with a thickness of 1-10 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf ball having excellent durability and capable of effectively utilizing energy at the time of hitting as a driving force.

[0002]

2. Description of the Related Art A two-piece golf ball as shown in FIG. 5 has been conventionally known. In FIG. 5, a golf ball 1 has a solid-structure core body (that is, a core body) 2 made of synthetic rubber having a large repulsive force, and a core body 2 made of a tough rigid synthetic resin having a very large repulsive force. The outer cover layer 3 directly covers the outer peripheral surface.
Although not shown in FIG. 5,
Many dimples are formed on the outer peripheral surface of the outer cover layer 3 as conventionally known. Further, a paint is applied to the outer peripheral surface of the outer cover layer 3 as conventionally known.

The golf ball 1 shown in FIG. 5 employs a synthetic rubber and a hard synthetic resin having a large repulsive force as the material of the core body 2 and the outer cover layer 3, respectively, so that the golf ball 1 can be quickly jumped out when hit with a golf club. Speed,
It can bring great flight distance.

A thread wound golf ball 21 as shown in FIGS. 6 and 7 is also known. This golf ball 21
A core body (that is, a core) 22 having a solid structure made of a hard synthetic rubber having a large repulsive force, and a wound layer 24 formed by directly winding a rubber thread 23 around the outer peripheral surface of the core body 22. And an outer cover layer 25 which is made of a hard synthetic resin which is tough and has a very high repulsive force and which directly covers the outer peripheral surface of the wound layer 24. Although not shown in FIGS. 6 and 7, the outer peripheral surface of the outer cover layer 25 of the golf ball 21
Many dimples are formed and a paint is applied.

In the golf ball 21 shown in FIGS. 6 and 7, the rubber thread 23 is made of natural rubber or soft synthetic rubber and has a substantially rectangular cross section (in a natural state before winding, the long side is about 2 mm and the short side is short). Side is about 0.5 mm).
The rubber thread 23 is tightly wound over the entire outer peripheral surface of the core body 22 so that one of the pair of long sides is the inner surface. The outer diameter of the core body 22 and the inner diameter of the wound layer 24 are each about 20 mm, the outer diameter of the wound layer 24 is about 40 mm, and the outer cover layer 25
Has an outer diameter of about 43 mm.

The outer surface of the wound layer 24 has a rubber thread 2
Since there are a large number of ridges formed by the outer surface of the third and a large number of gaps generated between the outer surfaces of the rubber threads 23, the periphery of the outer peripheral surface has an uneven structure. And the wound layer 24
When the outer cover layer 25 is formed, a certain amount of the molding material enters the uneven structure near the outer peripheral surface of the outer cover layer 25. A concavo-convex structure having a relationship is obtained.

Next, a manufacturing process of the golf ball 21 shown in FIG. 6 will be described with reference to FIG. First, FIG.
As shown in (A), the core body 22 is formed by die molding. Next, as shown in FIG. 7 (B), a thread wound layer 24 is formed by directly winding a rubber thread 23 around the outer peripheral surface of the core body 22. Next, as shown in FIG. 7 (C), an outer cover layer 25 is formed so as to directly cover the outer peripheral surface of the wound layer 24 by die molding. As a result, a golf ball 21 whose appearance is shown in FIG. 7C and whose cross section is shown in FIG. 6 can be produced.

The golf ball 21 shown in FIG. 6 and FIG.
By providing the thread winding layer 24 between the core body 22 and the outer cover layer 25, as a general characteristic, the impact feeling is soft, the spin is easily applied, and a high pop-out speed is obtained.

[0009]

SUMMARY OF THE INVENTION Golf balls 1, 21
In this case, the deformation is repeated every time the ball is hit, and the flexibility and elasticity of the core bodies 2, 22 and the wound layer 24 gradually decrease, and the initial performance is lost. The core bodies 2 and 22 and the wound layer 24
Stores the kinetic energy of the club head by deforming at the time of impact, and converts the energy as propulsion when the deformation recovers. For this reason, the golf ball 1 in which the flexibility and elasticity of the core bodies 2 and 22 and the wound layer 24 are reduced,
In No. 21, the energy at the time of impact is not effectively converted as propulsion, and the original performance cannot be exhibited. However, since the outer cover layers 3 and 25 are made of a hard synthetic resin that can withstand repeated impacts, the appearance of the golf balls 1 and 21 maintains the initial state for a relatively long time. Therefore, even if the golf balls 1 and 21 cannot exhibit their original performance, the golf balls 1 and 21 cannot often be judged from the appearance.
Sometimes it was too late to replace one. When the balls 1 and 21 whose replacement times have been missed are used, the best flight distance and directionality cannot be obtained, and the score of the hole may be deteriorated.

The present invention makes it possible to remedy the above-mentioned disadvantages of the conventional golf ball very simply and effectively.

[0011]

SUMMARY OF THE INVENTION A golf ball according to the present invention includes an internal structure having at least a portion containing an amorphous material, which is either a metal, an alloy, or carbon fiber; A cover layer covering the outer peripheral surface.

When a material having a crystalline structure is made to have an amorphous structure, strength, hardness and toughness (stickiness against external force) are remarkably improved. Examples of such a material include metals such as zirconium, titanium, aluminum, nickel, iron, manganese, copper, molybdenum, cobalt, tungsten, beryllium, and magnesium, and at least one of these metals as a main component. There are alloys and carbon fibers.

In a golf ball using the above-mentioned amorphous material for at least a part of the internal structure, deterioration with time and deterioration in flexibility and elasticity due to repeated hits are extremely small.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a golf ball 31 according to a first embodiment of the present invention has a substantially spherical shell formed of an amorphous metal or alloy having a hollow structure. 32, and an outer cover layer 33 which is substantially concentric with the shell 32 and directly covers the outer peripheral surface of the shell 32. Although not shown in FIGS. 1 and 2, many dimples are formed on the outer peripheral surface of the outer cover layer 33 of the golf ball 31 and a coating material is applied.

As the material of the shell 32, zirconium,
Titanium, aluminum, nickel, iron, manganese, copper,
There are metals such as molybdenum, cobalt, tungsten, beryllium, and magnesium, and alloys mainly containing at least one of these metals. In this embodiment, an amorphous alloy made of five metals of zirconium, titanium, copper, nickel and beryllium is used. The amorphous alloy is not limited to the combination of the above five metals, but may be a combination of a transition metal and a nonmetal, a transition metal and a transition metal, or a combination of a typical metal and a typical metal.

The outer diameter of the shell 32 is generally preferably from 33 to 47 mm from the viewpoint of practicality.
More preferably, it is between 37 and 42 mm, and in the case of the embodiment shown it is about 39 mm. Further, the difference between the outer diameter and the inner diameter of the shell 32 is generally, from the viewpoint of practicality,
It is preferably between 0.8 and 9 mm, more preferably between 1.6 and 5 mm, for example about 3 mm in the embodiment shown.

The outer cover layer 33 is preferably formed mainly of a hard elastic material which is strong and has high repulsion.
As such a hard elastic material, an ionomer resin conventionally used as a material for an outer cover layer in a golf ball such as a two-piece ball 1 as shown in FIG. Surlyn "), various synthetic resins such as butadiene polymer, butadiene styrene copolymer, butadiene acrylonitrile copolymer, styrene butadiene acrylonitrile copolymer, and various synthetic rubbers, and natural rubber such as balata rubber. Elastic materials containing at least one selected from them as a main component can be used.

[0018] Among these hard elastic materials, synthetic resin is particularly preferable. In the case of the illustrated embodiment, the above-mentioned Surlyn can be selected. Further, a filler such as zinc white, barium sulfate, calcium carbonate, silica or the like can be added to the hard elastic material as needed. Further, the inner diameter of the outer cover layer 33 may be substantially the same as the outer diameter of the shell 32. In general, the thickness of the outer cover layer 33 is preferably 0.5 to 5 mm, more preferably 1 to 3.4 mm from the viewpoint of practicality, and more preferably 1 to 3.4 mm. In this case, the outer diameter of the outer cover layer 33 is about 43 mm.

In the embodiment shown in the drawings, the shell 32 and the outer cover layer 33 are formed to have substantially uniform thicknesses, but need not necessarily be formed to have substantially uniform thicknesses. The inner and outer peripheral surfaces of the shell 32 and the inner peripheral surface of the outer cover layer 33 were each formed into a substantially spherical and smooth curved surface. However, it is not always necessary to have a substantially spherical and smooth curved surface, and a number of small openings can be formed in the shell 32. The size, number and distribution of such openings are as follows.
Each of the dimples may be substantially the same as the dimple formed on the outer peripheral surface of the outer cover layer 33, or a larger number of apertures may be formed in a smaller number.

Further, the outer peripheral surface of the shell 32 is formed into a concavo-convex shape similar to the outer peripheral surface of the thread rubber layer of the conventional thread-wound golf ball (that is, a shape having a large number of ridges crossing each other) and spin is applied. In some cases, the inner peripheral surface of the outer cover layer 33 and / or the inner peripheral surface of the shell 32 may intersect with each other so that the outer peripheral surface of the shell 32 has a substantially opposite concavo-convex relationship. A shape having a large number of concave ridges may be used. Therefore, the shell 32 and the outer cover layer 33
The inner diameter, outer diameter and thickness described above are
It means the average inner diameter, the average outer diameter, and the average thickness, respectively.

In the case of the illustrated embodiment, the shell 32
And the outer cover layer 33 was formed by a single layer made of one kind of amorphous alloy and one kind of hard elastic material, respectively. However, these shells 32 and outer cover layers 3
3 may be made of one or more kinds of amorphous metals or alloys and one or more kinds of hard elastic materials, and may be laminated with each other.

The shell 32 may be formed by using an amorphous metal or alloy as described above as a matrix, and reinforcing the matrix with whiskers such as carbon and boron, fibers and the like. . Further, the outer cover layer 33 uses a hard elastic material as described above as a matrix, and the matrix includes fibers such as carbon and glass.
It may be a reinforced hard elastic material containing fine pieces, powders, etc. of the above-mentioned amorphous metal or alloy for the whiskers and the shell 32.

Next, the manufacturing process of the golf ball 31 shown in FIG. 1 will be described with reference to FIG. First, FIG.
As shown in FIG. 1A, a cup-shaped hemisphere 34 obtained by substantially dividing the shell 32 shown in FIG. 1 into two is formed by press molding, mold molding, or the like. Next, the pair of hemispheres 34 are fixed to each other by welding, bonding or the like at their ring-shaped joints to form the substantially spherical shell 32 shown in FIG.

Next, using the shell 32 as a core, an outer cover layer 33 is formed directly on the outer surface of the shell 32 in the same manner as in the case of the two-piece ball 1 shown in FIG. Further, a paint is applied to the outer surface of the outer cover layer 33 as conventionally known. As a result, FIG.
A golf ball 31 whose outer appearance is shown in (B) and whose cross section is shown in FIG. 1 can be produced.

The outer cover layer 33 is formed by covering the shell 32 with a pair of cup-shaped hemispheres each obtained by dividing the outer cover layer 33 shown in FIG. It may be formed by bonding the peripheral surface to the outer peripheral surface of the shell 32 and fixing the ring-shaped joints of the pair of hemispheres to each other by bonding, welding, or the like. The outer cover layer 33 may be directly formed on the outer peripheral surface of the first cover.

In the first embodiment shown in FIGS. 1 and 2, a pair of hemispheres 34, each of which is obtained by substantially dividing the shell 32 into two parts, are fixed to each other at their ring-shaped joints to form a substantially spherical body. A shell 32 having a shape was formed. However, by using superplastic forming in which an amorphous metal or alloy is inflated with a fluid such as a gas such as argon gas or a liquid such as ethyl alcohol, the substantially spherical shell 32 as a whole is integrally formed. Can also. Alternatively, an approximately spherical shell 32 can be formed by forming an amorphous metal or alloy layer on the inner peripheral surface of the outer cover layer 33 by a method such as electroless plating.

In the first embodiment, the shell 32
The interior space was left empty (i.e., only air was present) without any particular filling. However, the inner space may be entirely or partially filled with a filler such as a liquid, a synthetic resin such as a foamed synthetic resin such as foamed polyurethane, a synthetic rubber, or a natural rubber. In this case, if the filling material is a sponge-like material, the average specific gravity of the entire internal space is sufficiently smaller than the average specific gravity of the golf ball 31 in a region other than the internal space. It is particularly preferable that the moment can be as large as possible.

As shown in FIG. 3 and FIG.
A golf ball 41 according to the embodiment has a wound layer 44 in which a substantially spherical core body 42 having a hollow structure and a filament 43 made of an amorphous metal or alloy are wound directly on the outer peripheral surface of the core body 42. And an outer cover layer 45 that directly covers the outer peripheral surface of the wound layer 44.

The spool layer 44 and the outer cover layer 45
Are substantially concentric with the core body 42, respectively.
Although not shown in FIGS. 3 and 4, a large number of dimples are formed on the outer peripheral surface of the outer cover layer 45 of the golf ball 42, and a paint is applied.

The above-mentioned core body 42 is preferably formed mainly of a hard or soft elastic material. Examples of such an elastic material include various synthetic resins such as a polyfunctional unsaturated ester and a butadiene polymer conventionally used as a core material in golf balls such as the wound ball 21 shown in FIGS. 6 and 7. , Butadiene styrene copolymer, butadiene acrylonitrile copolymer, at least one selected from the group consisting of various synthetic rubbers such as styrene butadiene acrylonitrile copolymer and various natural rubbers such as balata rubber as a main component. Elastic material.

Of these elastic materials, soft synthetic rubber is particularly preferable. In the case of the illustrated embodiment, a rubber component mainly containing a butadiene copolymer is added to a rubber component containing a polymerizable ethylenically unsaturated bond. A synthetic rubber obtained by crosslinking a pyridine metal complex having the following formula (I) can be selected. In addition, fillers such as zinc white, barium sulfate, calcium carbonate, silica and the like can be added to the elastic material as needed.

The outer diameter of the core body 42 is generally preferably 30 to 44 mm from the viewpoint of practicality.
More preferably, it is about 40 mm, in the case of the embodiment shown, for example, about 37 mm. Further, the core body 42
Is generally 0.4 to 4 from the viewpoint of practicality.
mm, and more preferably 0.8 to 2.6 mm, and in the illustrated embodiment, for example, about 1.5 mm, and in this case, the inner diameter of the core body 42 is about 34 mm. become.

The filaments 43 forming the wound layer 44
Is mainly formed of an amorphous metal or alloy having a relatively large repulsive force and moderate flexibility (that is, flexibility), and uses the same metal or alloy as that of the first embodiment. be able to. Also, in the filament 43 of this embodiment, as in the case of the first embodiment, 5 of zirconium, titanium, copper, nickel and beryllium are used.
An amorphous alloy composed of two metals is used.

The outer diameter of the wound layer 44 is generally preferably from 33 to 47 mm from the viewpoint of practicality, and is preferably from 37 to 47 mm.
More preferably, it is 43 mm, and in the case of the embodiment shown, it can be formed, for example, to about 40 mm. Further, the inner diameter of the wound layer 44 may be substantially the same as the outer diameter of the core body 42. The difference between the outer diameter and the inner diameter of the wound layer 44 is generally 1 to 10 from the viewpoint of practicality.
mm, more preferably 2 to 5 mm, and in the case of the embodiment shown in the drawing, it can be selected to be, for example, about 3 mm. Further, the porosity of the wound layer 44 is generally preferably from 5 to 60%, more preferably from 10 to 40%, from the viewpoint of practicality. For example, it can be selected to be about 20%.

The cross section of the filament 43 may be any shape such as a substantially rectangular shape, a substantially oval shape, a substantially elliptical shape, or a substantially circular shape, but is generally a flat shape such as a substantially rectangular shape or a substantially oval shape. Is preferred. And this flat-shaped filament 4
3 has a width (long side) of preferably 0.5 to 5 mm, more preferably 1 to 3 mm, and a thickness (short side) of 0.1 to 2.5 mm. Is preferred,
More preferably, it is 0.2 to 1.5 mm. Further, the ratio of the thickness (short side to long side) to the width of the filament 43 is preferably 1/10 to 2/3, and 1: 1.
/ 7 to 1/2 is more preferable.

In the illustrated embodiment, the cross section of the filament 43 is substantially rectangular (the long side is about 2 mm and the short side is about 0.5 m).
m) can be selected. And this line 43
Is preferably wound over the entire outer surface of the core body 42 such that one of the pair of long sides (that is, one of the deflected planes) is the inner surface.

In general, the outer diameter of the outer cover layer 45 is preferably from 36 to 50 mm, more preferably from 40 to 46 mm from the viewpoint of practicality. Is about 43 mm. Further, the difference between the outer diameter of the outer cover layer 45 and the outer diameter of the thread winding layer 44 is generally preferably 1 to 8 mm, more preferably 2 to 5 mm from the viewpoint of practicality. In the case of the illustrated embodiment, the distance is, for example, about 3 mm.

The molding material of the outer cover layer 45 is 1/10 to 3/5, preferably 1/10, of the outer peripheral surface side of the wound layer 44.
It is preferable to enter the gap at a thickness of ５〜 to １ ／. The outer cover layer 45 is formed of the same hard elastic material as in the first embodiment.

In the illustrated embodiment, the core body 42, the wound layer 44, and the outer cover layer 45 are formed to have substantially uniform thicknesses, but need not necessarily be formed to have substantially uniform thicknesses. Further, the inner peripheral surface and the outer peripheral surface of the core body 42 are each formed into a substantially spherical and smooth curved surface. However, the outer peripheral surface of the core body 42 is not necessarily formed into a substantially spherical and smooth curved surface. Further, in some cases, the inner peripheral surface of the core body 42 may be formed into an uneven shape so that the inner peripheral surface of the core body 42 has a substantially opposite unevenness relationship with the outer circumferential surface of the core body 42. Accordingly, the core body 42, the wound layer 44, and the outer cover layer 45
The above-mentioned inner diameter, outer diameter, and thickness related to the present invention mean an average inner diameter, an average outer diameter, and an average thickness, respectively.

In the case of the illustrated embodiment, the core 4
2. The wound layer 44 and the outer cover layer 45 are each formed of a single layer made of one kind of elastic material or one kind of amorphous metal or alloy. However, each of the core body 42, the wound layer 44, and the outer cover layer 45 is made of one or more kinds of elastic materials or one or more kinds of amorphous metals or alloys, and is laminated on each other. Is also good.

The core body 42 and the outer cover layer 45
Used an elastic material as a matrix, and the matrix contained fibers such as carbon and glass, fine pieces such as whisker and amorphous metal or alloy as described above for the wound layer 44, and powder. It may be a reinforced elastic material. Further, the wound layer 44 may be formed by using an amorphous metal or alloy as described above as a matrix, and reinforcing the matrix with whiskers such as carbon and boron, fibers, and the like.

Next, the manufacturing process of the golf ball 41 shown in FIG. 3 will be described with reference to FIG. First, FIG.
As shown in FIG. 3A, a cup-shaped hemisphere 46 obtained by substantially dividing the core 42 shown in FIG. 3 into two parts is formed from a soft or hard material by press molding, die molding or the like. Then, a pair of the hemispheres 46 are fixed to each other at their seam joints by bonding, welding, or the like.
The substantially spherical core body 42 shown in FIG.

Next, as shown in FIG. 4 (B), the filament 43 is formed by directly winding the filament 43 around the outer peripheral surface of the core body 42 as shown in FIG. 4 (B). Then
FIGS. 6 and 7 show this wound layer 44 as a second core body.
In the same manner as in the case of the thread wound golf ball 1 shown in FIG.
5 is formed. As a result, a golf ball 41 whose appearance is shown in FIG. 4C and whose cross section is shown in FIG. 3 can be produced. Note that the outer cover layer 45 can be formed by the various methods described in the first embodiment.

In the second embodiment, the core 4
By fixing a pair of hemispheres 46, each of which is substantially divided into two, to each other at their ring-shaped joints, a substantially spherical core 42 is formed.
However, it is also possible to integrally mold the substantially spherical core 42 as a whole using superplastic molding in which a soft or hard material is expanded with a fluid such as a gas such as argon gas or a liquid such as ethyl alcohol. Further, the outer peripheral surface and / or the inner peripheral surface of the core body 42 and the outer layer cover layer 45 are formed.
A thin amorphous metal or alloy layer may be formed on the inner peripheral surface by electroless plating or the like to reinforce the core 42 and the outer cover layer 45.

In the second embodiment, the core 4
The interior space of No. 2 is hollow without filling anything (ie,
(Only air is present). However, the interior space may be entirely or partially filled with a filler such as a liquid, a synthetic resin such as a foamed synthetic resin such as polyurethane foam, a synthetic rubber such as a foamed synthetic rubber, or a natural rubber. In this case, if the filling material is a sponge-like material, the average specific gravity of the entire internal space is sufficiently smaller than the average specific gravity of the area other than the internal space in the golf ball 41, so It is particularly preferable because the moment of inertia can be made as large as possible.

The core body 42 may be made of not only a hollow structure but also a solid structure by using a foamed synthetic resin such as styrofoam or a sponge such as foamed rubber. In this case, the hollow or solid core body 42
A thin amorphous metal or alloy layer for reinforcement may be formed on the outer peripheral surface and / or the inner peripheral surface of the substrate.

Further, in the second embodiment, the golf ball 41 has the core 42 functioning as a winding core for the wound layer 44, but the core 42 may be omitted. The differences from the second embodiment in this case are as follows.

That is, the golf ball 41 has a core 42
Has been omitted, the interior space of the wound layer 44 remains a cavity in which nothing is particularly filled (that is, only air exists). Further, since a filament 43 having a weight corresponding to the weight of the core body 42 can be additionally provided on the inner peripheral surface of the wound layer 44, the inner diameter of the wound layer 44 can be slightly reduced, and This inner diameter amounts to approximately 36.5 mm in the case of the embodiment shown.

Accordingly, the inner diameter of the wound layer 44 is generally preferably from 29.5 to 43.5 mm, more preferably from 33.5 to 39.5 mm, from the viewpoint of practicality. Further, the difference between the outer diameter and the inner diameter of the wound layer 44 is about 3.5 mm in the case of the illustrated embodiment, and generally 1.5 to 9 mm from the viewpoint of practicality. More preferably, it is 2.5 to 6 mm.

Further, in order to form the substantially spherical wound layer 44 without using the core member 42, the following methods can be used. Wire 4 having not only appropriate flexibility but also appropriate rigidity
3, a thread wound layer 44 is formed by winding the filament 43 corelessly. A core is formed by radially combining a number of pin-shaped members, and a wound layer 44 is formed by winding the filaments 43 around the plurality of pin-shaped members of the core. In this case, many pin-shaped members are removed from the wound layer 44 during or after winding. By using a brazing material such as paraffin or beeswax, a sublimable material such as naphthalene, camphor, or solid carbonic acid, or a frozen object such as an ice block, a core having a solid or hollow structure is formed, and a filament 43 is wound around the core. Wound layer 4
Create 4. After or during the winding, the core is melted or sublimated by a solvent, heating, or the like, and is removed from the wound layer 44.

In the first embodiment, the shell 32 is formed using an amorphous metal or alloy. However, as a third embodiment, the shell may be formed from amorphous carbon fibers. it can. The structure in this case is almost the same as that of the first embodiment, so that the illustration is omitted. However, since the shell of the third embodiment has a smaller specific gravity than the shell of the first embodiment, if the shell has the same size as the shell of the first embodiment, the weight becomes lighter. Therefore, in order to make the total weight of the golf ball equal to that of the first embodiment, the dimensions of the shell and the outer cover layer are changed, and a core made of natural rubber, synthetic rubber, synthetic resin, or the like is provided inside the shell. You may combine bodies.

Further, the weight of the shell can be increased by mixing the metal powder with a curing agent used for forming the shell. In this case, since the weight is concentrated near the outer periphery of the golf ball as in the first embodiment, the moment of inertia of the golf ball can be increased. The shell made of amorphous carbon fiber should be made by a well-known method of forming a fiber-reinforced resin of this type, such as attaching a mat-like material to the male surface or the female inner surface and laminating it. Can be. When a core body is used, a mat-like amorphous carbon fiber may be directly attached to the core body and laminated.

Further, in the second embodiment, the wound layer 44 is formed by winding a filament 43 made of an amorphous metal or an alloy. However, as a fourth embodiment, the wound layer is made of an amorphous carbon. It can also be formed of fibers. The structure in this case is the second
Since it is almost the same as the embodiment, the illustration is omitted. In addition,
The filaments of the amorphous carbon fibers are rolled and cured while applying a curing agent, or are wound in advance.

In the standards of golf balls (certified balls) by the Golf Associations of the United Kingdom, the United States and Japan, the upper limit of the total weight of the ball, the lower limit of the diameter, the upper limit of the launch speed (when a predetermined impact is given), etc. Are respectively defined, it is preferable that the golf balls of the first, second, third and fourth embodiments also have numerical values in accordance with such a standard. However, in the case of private use, it is not always necessary to have a numerical value according to the above standard, and when the above standard is changed, the numerical value can be changed in accordance with this change.

[0055]

According to the present invention, an internal structure having at least a portion containing an amorphous material, which is any of a metal, an alloy, and a carbon fiber, is deteriorated with time, and its flexibility and elasticity are reduced even by repeated impacts. Is extremely small as compared with the conventional one. Therefore, the durability of the golf ball can be improved.

Since the durability of the internal structure of the golf ball is higher than the durability of the outer cover layer, the ball can be used as long as the outer cover layer can withstand use. Therefore,
The replacement time can be determined by looking at the appearance of the ball, and one ball can be used up effectively.

Further, in the above-mentioned internal structure, since the deformation at the time of hitting is quickly and surely recovered, the time during which the ball deforms and rotates in an unstable state is extremely short. Therefore,
Immediately after the ball is hit, the rotation of the ball is stabilized, so that the flight distance of the ball is large and the straightness is good.

In addition, a golf ball having an internal structure having a hollow structure and made of an amorphous metal or alloy has a large moment of inertia with respect to the total weight of the golf ball. Even if the ball is not hung, the spin is effectively maintained until the ball lands, so that the flight distance of the ball is long and the straightness is good. Moreover, since the spin is effectively maintained until the ball lands, the ball does not roll unnecessarily after the ball lands.

Since the strength, hardness and toughness of the internal structure are improved, the durability of the golf ball is not impaired even if a cover layer softer than the conventional one is used. By using a soft cover layer, the friction between the club face and the golf ball is increased, so that a golf ball that is easy to spin when the ball jumps out can be provided.

Further, in a golf ball having an internal structure formed by winding a fibrous amorphous material, the manner of spinning at the time of hitting and the jumping speed can be determined by changing the manner of winding the fiber. It is possible to provide various golf balls individually corresponding to various golfers and various course conditions.

[Brief description of the drawings]

FIG. 1 is a sectional view of a golf ball according to a first embodiment of the present invention.

2A is a perspective view showing a step of forming the shell of FIG. 1, and FIG. 2B is a perspective view showing a step of forming an outer cover layer of FIG.

FIG. 3 is a cross-sectional view of a golf ball according to a second embodiment of the present invention, in which the left half is completely cross-sectional and the right half is only the outer cover layer.

4A is a perspective view showing a step of forming a core body of FIG. 3, FIG. 4B is a front view showing a step of forming a wound layer of FIG. 3, and FIG. 4C is an outer side of FIG. It is a front view which shows the formation process of a cover layer.

FIG. 5 is a cross-sectional view of a conventional two-piece golf ball.

FIG. 6 is a sectional view of a conventional thread wound golf ball.

7A is a front view showing a step of forming the core body of FIG. 6, FIG. 7B is a front view showing a step of forming the wound layer of FIG. 6, and FIG. 7C is an outer view of FIG. It is a front view which shows the formation process of a cover layer.

[Explanation of symbols]

 31 golf ball 32 shell 33 outer cover layer 41 golf ball 42 core 43 streak

Claims (6)

[Claims] 1. An internal structure having at least a portion containing an amorphous material which is one of a metal, an alloy and a carbon fiber, and a cover layer covering an outer peripheral surface of the internal structure. A golf ball comprising: a golf ball; 2. The method according to claim 1, wherein the metal is zirconium, titanium, aluminum, nickel, iron, manganese, copper, molybdenum,
The golf ball according to claim 1, wherein the alloy is any one of cobalt, tungsten, beryllium, and magnesium, and the alloy has at least one of the metals as a main component. 3. The golf ball according to claim 1, wherein the internal structure has a hollow structure. 4. The inner structure has an outer diameter of 33 to 47 mm, a difference between an outer diameter and an inner diameter of the inner structure is 0.8 to 9 mm, and an outer diameter of the cover layer and the inner structure. The difference with the outside diameter of the body is 1
The golf ball according to claim 3, wherein the diameter is 10 to 10 mm. 5. The golf ball according to claim 3, wherein the hollow structure is formed by winding the fibrous amorphous material. 6. The method according to claim 5, wherein the fibrous amorphous material is wound around a core body, and a difference between an outer diameter and an inner diameter of the internal structure is 1 to 8 mm. The golf ball as described.