JP4626146B2 - Golf ball, golf ball design method and golf ball manufacturing mold - Google Patents

Description

The present invention relates to a golf ball having a plurality of dimples on the surface, a method for designing the golf ball, and a mold for manufacturing a golf ball.

  A golf ball is generally provided with a plurality of dimples on the surface of the golf ball in order to suppress the air resistance during the flight of the golf ball as much as possible and improve the flight distance, and various golf balls have been proposed. That is, golf balls have been proposed in which the arrangement of a plurality of dimples provided on the golf ball is variously changed.

Patent Document 1 shown below discloses a golf ball having dimples having two different diameters that cover at least about 78% of the entire surface of the golf ball.
On the other hand, in Patent Document 2 shown below, a plurality of hexagonal dimples are arranged in at least a part of the surface of the golf ball so that the sides of adjacent hexagonal dimples are arranged substantially in parallel with a land having a substantially constant width. A densely arranged golf ball is disclosed. Here, the land means a land portion remaining between the dimples when the dimples are provided on the surface of the golf ball.
Further, Patent Document 3 shown below proposes a golf ball in which adjacent dimples are partially overlapped so that the area of the overlapping portion is 5 to 55% of the total surface area of the ball.
On the other hand, Non-Patent Document 1 shown below proposes a golf ball in which an aero network that has a predetermined shape and forms a recess occupies the entire surface of the golf ball (HLA Golf Ball, manufactured by Callaway).

JP-A-63-309282

JP-A-7-28962

JP 2000-317014 A

"Callaway golf balls", [searched August 27, 2002], Internet <URL: http://www.callawaygolf.com/japan/balls/HX_red.asp>

However, the golf balls disclosed in Patent Documents 1 to 3 and Non-Patent Document 1 are not necessarily low in air resistance during flight and cannot be said to realize a sufficient flight distance.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a golf ball having a low air resistance during flight and a sufficient flight distance, a golf ball design method, and a golf ball manufacturing mold for manufacturing the golf ball. To do.

The present invention provides a golf ball having a plurality of dimples arranged on the surface of the golf ball, wherein at least one dimple of the plurality of dimples has an edge of the dimple forming each side of a substantially polygonal shape. Are formed by adjacent dimples and a ridge-shaped boundary, and a shape along the boundary of the ridge-shaped boundary of each side of the edge is formed by a concave curve that is recessed toward the inside of the golf ball. A golf ball is provided.
Here, the ridge-like boundary includes those having a ridge width of 0.5 mm or less, and more strictly, those having a ridge width of 0.2 mm or less. Therefore, dimples are adjacent to each other when the distance between the dimples is 0.5 mm or less, and more strictly when the distance is 0.2 mm or less.

Here, the edge portion of at least one dimple is adjacent to, for example, three dimples, and each side of the edge portion is formed by the ridge-shaped boundary. Alternatively, the edge of at least one dimple is adjacent to five or six dimples and each side of the edge is formed by the ridge-like boundary.
In particular, it is preferable that each side of the edge of substantially all the dimples arranged on the surface of the golf ball is formed by the ridge-shaped boundary.

  The present invention also relates to a golf ball having dimples disposed on the surface of the golf ball, wherein a portion on the surface of the golf ball furthest from the center of the circumscribed sphere circumscribing the golf ball is equidistant from the center of the circumscribed sphere. In addition, a golf ball having a plurality of finite points on the edge of a dimple is provided.

In the present invention, a plurality of dimples are arranged on the surface of the golf ball , and at least one dimple of the plurality of dimples has an edge of the dimple forming each side of a substantially polygonal shape. Golf There is formed by the dimples and the ridge-like boundaries adjacent and shape along said boundary of the ridge-like boundaries of each side of the edge that is formed by the concave curve recessed towards the inside golf ball A ball design method comprising: a first circle arranging step of arranging a plurality of first circles on an entire spherical surface of a sphere of a predetermined size so that adjacent first circles are in contact with each other; Each of the three first circle pairs in contact with each other among the circles is inscribed in a second spherical triangle formed by connecting the center positions of the three first circles. Place a circle That a second circular arrangement step and a center position of the second circle and the center position of the first circle, the center position of the dimple arranged in Goruboru surface, the first circle and the second circle A dimple placement step for placing dimples on the surface of a golf ball by creating a spherical pattern corresponding to each side of the edge of the dimple by creating a string that connects two intersections of the circles that overlap each other A golf ball design method characterized by comprising:
Here, the circle inscribed in the spherical triangle means a case where the edge of the circle and the spherical triangle are close to each other by a distance of at least 0.5 mm, more strictly, a case where they are close to each other by a distance of 0.2 mm or less. .

Here, in the first circle arrangement step, the first circle is positioned so that the center is located on each side of the first spherical triangle of the same size formed by dividing the entire spherical surface into 20 equal parts. After that, it is preferable that the first circle is arranged inside the first spherical triangle so as to be in contact with the first circle arranged on the side. At that time, the number of first circles arranged on each side of the first spherical triangle in the first circle arranging step is an even number.
In addition, a golf ball manufacturing die characterized by manufacturing a golf ball designed by the golf ball designing method of the present invention is provided.
Furthermore, the present invention provides a golf ball characterized by being manufactured by the golf ball manufacturing mold.

  Further, the present invention is a golf ball manufacturing mold having a golf ball surface forming surface in which a plurality of protrusions are arranged corresponding to the dimples on the surface of the golf ball, wherein at least one of the plurality of protrusions is The edges form sides of a substantially polygonal shape, each side of the edge is formed by an adjacent convex part and a groove-like boundary, and along the boundary of the groove-like boundary of each side of the edge Provided is a golf ball manufacturing mold characterized in that all of the shapes are convex shapes that protrude from the golf ball surface forming surface toward the outside of the golf manufacturing mold.

The golf ball of the present invention can suppress the air resistance of the golf ball in flight and can improve the flight distance. Further, the occupancy rate of the dimples on the entire surface of the golf ball can be increased as much as possible, for example, the occupancy rate can be substantially 100%. The mold for manufacturing a golf ball of the present invention can mass-produce such a golf ball. can do.
In addition, the golf ball designing method of the present invention is such that all edges are formed by a plurality of adjacent dimples and a ridge boundary, or on the surface of the golf ball farthest from the center of the circumscribed sphere that circumscribes the golf ball. The golf ball having the dimple arrangement structure can be easily designed in which the portions are a plurality of finite points on the edge of the dimple, which are equidistant from the center of the circumscribed sphere.

  Hereinafter, the golf ball, the golf ball designing method, and the golf ball manufacturing mold according to the present invention will be described in detail based on the preferred embodiments shown in the accompanying drawings.

FIG. 1 is a perspective view of a golf ball which is a preferred embodiment of the golf ball of the present invention.
The golf ball 10 shown in FIG. 1 has a plurality of dimples on the golf ball, and all of the edges forming the outline of the dimple are substantially triangular, pentagonal and hexagonal, and this dimple is the golf ball. Covers almost the entire surface. Each side of the edge portion of the dimple having a substantially polygonal shape is formed by a plurality of adjacent dimples and a ridge-like boundary having a substantially polygonal edge portion of a substantially triangular shape, a substantially pentagonal shape or a substantially hexagonal shape.
The fact that the dimple covers substantially the entire surface of the golf ball means that it covers substantially all the dimples corresponding to parting lines, support pins or air vent pins in a golf ball manufacturing mold for manufacturing a golf ball. .
In addition, the substantially polygonal shape refers to a shape in which there are a plurality of vertices having at least three points and each side is formed accordingly.
The surface of the dimple that covers the surface of the golf ball 10 is a spherical surface, that is, a curved surface having a single radius of curvature.

For example, the edges of the dimple D ₁ has a substantially hexagonal shape with a vertex P ₁ to P _6, as shown in FIG. 2 (a), each side edge of the dimple D ₁ is a single It is formed by ridge-like boundaries l _{1 to} l ₆ that divide _six adjacent dimples formed by curved surfaces having a single radius of curvature. The edge of the dimple D ₂ has a substantially triangular shape having vertices Q _{1 to} Q _3, and each side of the edge of the dimple D ₂ has a single curvature as shown in FIG. It is formed by ridge-like boundaries l _{7 to} l ₉ that divide adjacent three dimples formed by curved surfaces having a radius. The edge of the dimple D ₃ has a substantially pentagonal shape having five vertices, and each side of the edge of the dimple D ₃ is formed of five adjacent dimples formed by a curved surface having a single radius of curvature. It is formed by a ridge-like boundary that partitions
In addition, since the boundary of the edge part of the dimple is determined by the adjacent dimple, each side of the ridge-shaped boundary is determined by the size of the adjacent dimple and the like and forms a substantially polygonal shape.

Further, the ridge-shaped boundary that forms the edge of the dimple is formed by a concave curve in which the shape along the boundary is recessed toward the inside of the golf ball 10.
Figure 3 is a view showing a sectional shape of the ridge boundary l6 when cut by a plane passing through the center O of the vertices P ₁ and vertex P ₆ and the golf ball shown in FIG.
The ridge-shaped boundary connecting the apexes is formed by a concave curve that is recessed toward the inside of the golf ball 10. That is, the ridge-like boundary l6 is recessed toward the inside of the golf ball 10 with respect to the virtual circumscribed sphere X circumscribing the golf ball 10 shown in FIG.

Further, the portion on the surface of the golf ball farthest from the center of the virtual circumscribed sphere X is a plurality of dimple edges that are equidistant from the center O that is the center of the golf ball 10 and also the center of the virtual circumscribed sphere X. It has a finite number of vertices. In FIG. 3, hexagonal vertices P ₁ and P ₆ are shown as a finite number of points on the surface of the golf ball farthest from the center of the virtual circumscribed sphere X and equidistant from the center O. . Similarly, the vertices P ₂ , P ₃ , P ₄ , P ₅ , Q ₁ , Q ₂ , R _1, etc. of the substantially polygon shown in FIG.

With such a configuration, the occupation ratio of dimples to the entire golf surface is substantially 100%, and a golf ball in which lands are not substantially formed is realized. Substantially 100% means that dimples corresponding to parting lines, support pins, air vent pins, and the like in a golf ball manufacturing mold for manufacturing a golf ball are excluded.
Note that the surfaces of the dimples formed on the golf ball 10 are each formed as a spherical surface having a single radius of curvature, but the present invention is not limited to this. The surface of each dimple is preferably formed so that at least the shape of the ridge-shaped boundary is formed by a concave curve that is recessed toward the inside of the golf ball.
Further, the edge of the dimple is formed by a ridge-like boundary with three, five, and six adjacent dimples. In the present invention, the edge of the dimple has a ridge-like boundary with three adjacent dimples. May be formed by a ridge-like boundary between five and six adjacent dimples, and in the present invention, particularly adjacent to each other. The number of dimples to be played is not limited.
In the present invention, at least one or more dimples described above may be present on the surface of the golf ball.

The edge of such a dimple partially overlaps the circular contour of the dimple formed on the surface of the golf ball with a single radius of curvature and the circular contour of the adjacent dimple. Can be formed. As the circular contours of adjacent dimples partially overlap, a ridge-like boundary is formed between the surfaces of the dimples, and the edges of the dimples D ₁ and D ₂ are formed as shown in FIGS. All sides can be formed by ridge-like boundaries l _{1 to} l ₆ and l _{7 to} l ₉ .
Such dimples covering the surface of the golf ball can be realized by arranging the dimples using the golf ball designing method of the present invention as described below.

4 to 7 show an embodiment of the golf ball designing method of the present invention.
A spherical spherical surface 27 having an outer diameter equivalent to the outer diameter of the golf ball to be created is divided into ten parts.
That is, for the hemisphere having the point 20 as one pole of the sphere, the dividing lines 21, 22, 23, 24, and 25 are isotropically drawn around the point 20, and the hemisphere centered on the point 20 is divided into five. About the hemisphere centered on the other pole opposite to the pole of the point 20, five dividing lines are drawn isotropically around the other pole, and the hemisphere centered on this pole is divided into five. In this way, the spherical surface 27 is divided into ten.
FIG. 4 shows an equator line 26 that is a boundary line between one hemisphere having the point 20 as a pole and the other hemisphere.

A circle of a predetermined size is arranged along the 10 dividing lines so that the circles are in contact with each other, and a circle (inside each of the 10 divided areas surrounded by the two dividing lines and the equator line 26) The first circle) is arranged without a gap.
Also, the circles are arranged so that the circles are in contact with each other even between the divided regions having the equator line 26 as a boundary line. The arrangement of the circles arranged inside and between the divided areas may be performed by any method in the present invention.
In order to effectively suppress the air resistance during the flight of the golf ball, the width of the ridge-like boundary of the edge portion of the dimple finally obtained is 0.5 mm or less, more strictly 0.2 mm or less. Therefore, the region of the apex of the edge of the dimple having a substantially polygonal shape is a region surrounded by a circle having a diameter of 0.5 mm, more strictly, a region surrounded by a circle having a diameter of 0.2 mm. The kind of circle to be arranged on the spherical surface 27 is set and arranged so as to satisfy this condition.
In this way, it can arrange | position without gap so that a circle | round | yen mutually touches the whole spherical surface of a sphere.

In this embodiment, the spherical polyhedron is formed by dividing the spherical surface into 10 parts, but the present invention is not limited to this dividing method. For example, the spherical polyhedron may be formed by dividing the spherical surface 27 into 8 or 20 parts. Good.
In the present invention, it is preferable that the circle is arranged so as to be in contact with at least the circle adjacent in each divided region and between the divided regions. In this embodiment, the number of circles that touch adjacent circles is five or six. However, the number is not particularly limited, and may be four, seven, eight, or the like.

In this way, the spherical surface 27 arranged so that there is no gap between the circles and in contact with the adjacent circle is used as the golf ball surface, and the circle is used as the contour shape of the circular dimple and the dimple is arranged on the golf ball surface. Many lands exist in a portion surrounded by three dimples in contact with each other.
Therefore, in this embodiment, a spherical triangle (second spherical triangle) formed by connecting the center positions of the three circles that are in contact with each other among the circles that are in contact with each other. A circle (second circle) is further arranged so as to touch.

FIG. 5 shows, as an example, spherical triangles 28, 29, 30, and 31 formed by connecting the center positions of three circles adjacent to each other among the circles arranged on the spherical surface 27. Such spherical triangles are created for all three circles adjacent to and in contact with each other among the circles shown in FIG.
A circle is created so as to be inscribed in the created spherical triangle and placed on the spherical surface 27. FIG. 6 shows a circle arranged so as to be inscribed in the spherical triangle created on the spherical surface 27.

Finally, the circle shown in FIG. 4 and the circle shown in FIG. 6 are overlapped on the spherical surface 27 to create a string connecting the two intersections of the overlapped circles. A pattern of the spherical surface 27 corresponding to each side of the edge of the dimple of the golf ball can be created.
Therefore, the center position of the circle shown in FIG. 4 and the center position of the circle shown in FIG. 6 are the center positions of the dimples arranged on the surface of the golf ball to be designed, and the sizes according to the sizes of these circles. A dimple having a spherical surface is disposed.
Thereby, it is possible to create a dimple having a substantially triangular shape, a substantially pentagonal shape and a substantially hexagonal shape as shown in FIG.
In the present embodiment, it is not always necessary to dispose a dimple having a spherical surface with a single radius of curvature, and the dimple cross-sectional shape increases linearly as the distance from the edge increases. It may be a dimple constituted by a planar side surface portion and a bottom surface portion connected thereto.

FIG. 8 is a diagram illustrating a case where a spherical polyhedron is formed by dividing the spherical surface 27 into 20 parts.
First, a spherical spherical surface 27 having an outer diameter equivalent to the outer diameter of the golf ball to be created is divided into 20 parts. That is, the point 33 is set as a base point on the spherical surface 27, a spherical triangle (first spherical triangle) is isotropically arranged around the point 33, and the spherical surface 27 is divided into 20 by the same spherical triangle. Hereinafter, since the same processing is performed for each spherical triangle, the spherical triangle that divides the spherical surface 27 into 20 equal parts will be described as a representative of the spherical triangle A formed by the points 33, 34, and 35.
Next, a circle (first circle) whose center is located on each side of the spherical triangle A is arranged. The circles are arranged so as to contact each other on the side of the spherical triangle A. In the example of FIG. 8, six circles are arranged on each of the three sides of the spherical triangle A, and are arranged so as to contact each other without a gap. In the present invention, the number of circles arranged on the sides of the spherical triangle is not limited to 6, and may be an even number such as 2, 4, 8, 10, or the like. By arranging an even number, the ridge-like boundary of the dimple can be configured to be positioned on the substantially equator line of the spherical surface 27 as will be described later.

  Thereafter, a circle is arranged on the inner part of the spherical triangle A so as to contact the circle arranged on each side of the spherical triangle A. Thus, the circles are arranged on the spherical surface 27 in the spherical triangle A so as to be in contact with each other without any gap.

Next, for each of a set of three circles in contact with each other among the circles arranged in the spherical triangle A, a spherical triangle (second spherical triangle) formed by connecting the center positions of the three circles is formed. A circle (second circle) is further arranged so as to be inscribed.
FIG. 9 shows a circle and a spherical triangle A arranged so as to be inscribed in the spherical triangle (second spherical triangle) created on the spherical surface 27. A circle (second circle) is arranged so as to contact each side of the spherical triangle A.

Finally, the circle shown in FIG. 8 (first circle) and the circle shown in FIG. 9 (second circle) are superimposed on the spherical surface 27 shown in FIG. 8, and the two intersecting points of the overlapping circles are connected. By creating the strings, it is possible to create the pattern of the spherical surface 27 corresponding to each side of the edge of the dimple of the golf ball of the present invention.
The center position of the circle shown in FIG. 8 and the center position of the circle shown in FIG. 9 are the center positions of the dimples arranged on the golf ball surface of the golf ball to be designed, and the size according to the size of these circles, A dimple having a spherical surface as shown in FIG.
Thereby, it is possible to create a dimple having a substantially triangular shape, a substantially pentagonal shape and a substantially hexagonal shape as shown in FIG.

  In the sphere 27 with the dimples thus created, as shown in FIG. 10, a ridge-like boundary between adjacent dimples can be located on the equator line B when the point 33 is the pole of the spherical surface 27. .

In order to manufacture a golf ball designed in this way, it is necessary to manufacture a mold master for manufacturing a golf ball manufacturing mold. The mold master is a prototype of a golf ball in which the same dimples as the dimples arranged on the golf ball are arranged on the surface of a sphere having the same outer diameter as the golf ball to be designed. A golf ball manufacturing mold is manufactured using the mold master.
In the case of the dimple shown in Patent Document 2 or Non-Patent Document 1 having a substantially hexagonal outline shape, it is necessary to form the dimple using an NC lathe or the like, whereas in the case of the golf ball of the present invention The spherical surface of the mold master can be cut with a drill to form dimples, which has the advantage of facilitating the production of the mold master.

FIG. 10 is a schematic perspective view of a golf ball manufacturing mold 40 for manufacturing and mass-producing the golf ball 10.
The golf ball manufacturing mold 40 has an upper split mold 42 and a lower split mold 44 having the same configuration as the upper split mold 42, and the upper split mold 42 and the lower split mold 44 are joined to each other when molding a golf ball. In this way, the golf ball core and the golf ball cover molding material are supplied into the spherical cavities formed in the interior before joining to mold the golf ball.
The cavity surface of each of the upper split mold 42 and the lower split mold 44 has a golf ball surface forming surface 48 in which a plurality of convex portions 46 corresponding to the dimples on the golf ball surface are arranged.

The plurality of convex portions 46 arranged on the golf ball surface forming surface 48 are formed by edges having substantially polygonal sides, and each side of the edge is formed by adjacent convex portions and groove-like boundaries. In addition, the shape along the boundary of the groove-like boundary of each side of the edge portion is a convex shape that is convex from the golf ball surface forming surface 48 toward the outside of the golf production mold.
As a result, the golf ball dimples to be molded have all the sides of the substantially polygonal edge formed by the ridge-like boundaries with a plurality of adjacent dimples, and along the ridge-like boundary boundaries of each side The shape is formed by a concave curve that is recessed toward the inside of the golf ball.

In the golf ball of the present invention, a substantially polygonal edge is formed by a plurality of adjacent dimples and a ridge boundary, or the surface of the golf ball farthest from the center of the circumscribed sphere circumscribing the golf ball The upper portion is a plurality of finite points on the edge of the dimple that are equidistant from the center of the circumscribed sphere. The golf ball of the present invention has at least one such dimple. It is good to have one or more.
In addition, the golf ball of the present invention may have substantially the above characteristics. That is, when a golf ball is manufactured using the golf ball manufacturing mold 40, a process of removing burrs on the surface of the golf ball and a process of coating the golf ball surface after manufacturing the golf ball using the mold. Therefore, the ridge shape of the ridge boundary at the edge with a plurality of adjacent dimples may be slightly rounded to have a slight ridge width, but the golf ball of the present invention has been commercialized to include such an error. Golf balls are also included.
For example, the ridge-like boundary in the present invention includes a ridge shape that is rounded and has a ridge width of 0.5 mm or less, and more strictly, a ridge-like boundary that has a ridge width of 0.2 mm or less. Therefore, the dimples are adjacent to each other when the distance between the dimples is 0.5 mm or less, and more strictly, when the distance is 0.2 mm or less. The apex of the edge of the dimple where the ridge-shaped boundary intersects refers to a region surrounded by a circle having a diameter of 0.5 mm, and more strictly, a region surrounded by a circle having a diameter of 0.2 mm. In addition, a circle inscribed in the spherical triangle means that the edge of the circle and the spherical triangle are close to each other at a distance of at least 0.5 mm, more strictly, a case where they are close to each other at a distance of 0.2 mm or less. .
A golf ball having a size in the above range effectively reduces the air resistance during flight and improves the flight distance of the golf ball.

Such a golf ball is composed of a plurality of finite points on the edge of the dimple in which the part on the surface of the golf ball farthest from the center of the circumscribed sphere circumscribing the golf ball is equidistant from the center of the circumscribed sphere. Therefore, while satisfying the standard of certified golf balls that have a predetermined outer diameter, the projected area when flying can be suppressed, and the air resistance can be reduced. Further, since each side of the edge portion of the substantially polygonal dimple is formed by the ridge-like boundary with a plurality of adjacent dimples, the occupation ratio of the dimple to the golf ball surface can be substantially 100%, Air resistance during flight can be suppressed. Thereby, the flight distance of the golf ball is improved.
In addition, the conventional golf ball is highly distinguishable in terms of viewing angle and touch, and can be easily distinguished from the conventional golf ball during golf play.

  As described above, the golf ball, the golf ball designing method, and the golf ball manufacturing mold of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, Of course, improvements and changes may be made.

  In the golf ball of the present invention, the dimple occupancy rate is surely increased as compared with the conventional one, so that the air resistance during flight can be reduced and a sufficient flight distance is realized.

1 is a perspective view of a golf ball that is an embodiment of the golf ball of the present invention. (A) And (b) is a figure explaining the outline shape of the dimple shown in FIG. FIG. 2 is a cross-sectional view showing a cross-sectional shape along the ridge boundary of the dimple of the golf ball shown in FIG. 1. It is a figure explaining 1 process of the design method of the golf ball of this invention. It is a figure explaining the other process of the golf ball design method of the present invention. It is a figure explaining the other process of the golf ball design method of the present invention. It is a figure explaining the other process of the golf ball design method of the present invention. It is a figure explaining 1 process of the design method of the golf ball of this invention. It is a figure explaining the other process of the golf ball design method of the present invention. It is a figure explaining the other process of the golf ball design method of the present invention. 1 is a perspective view of a golf ball manufacturing mold that is an embodiment of the golf ball manufacturing mold of the present invention. FIG.

Explanation of symbols

10 Golf Ball 20, 33, 34, 35 Points 21, 22, 23, 24, 25 Dividing Line 26 Equatorial Line 27 Spherical Surface 28, 29, 30, 31 Spherical Triangle 40 Golf Ball Manufacturing Die 42 Upper Mold
44 Lower mold type 46 Projection 48 Golball surface forming surface

Claims (5)

A plurality of dimples are arranged on the golf ball surface ,
At least one dimple of the plurality of dimples has an edge portion of the dimple forming each side of a substantially polygonal shape, and each side of the edge portion is formed by an adjacent dimple and a ridge-shaped boundary, and the edge portion a method of designing a golf ball the shape along the boundary of the ridge-like boundaries that are formed by the concave curve recessed towards the inside golf ball of each side of,
A first circle arranging step of arranging a plurality of first circles on the entire spherical surface of a sphere of a predetermined size so that adjacent first circles are in contact with each other;
Of each of the arranged first circles, a set of three first circles in contact with each other is inscribed in a second spherical triangle formed by connecting the center positions of the three first circles. A second circle placement step for placing a second circle on
The center position of the first circle and the center position of the second circle are the center positions of the dimples arranged on the surface of the golf ball, and the circles overlapped when the first circle and the second circle are overlapped with each other A dimple arrangement step of arranging a dimple on the golf ball surface by creating a spherical pattern corresponding to each side of the edge of the dimple by creating a string connecting the two intersections Golf ball design method.   In the first circle arrangement step, the first circle is arranged so that the center is located on each side of the first spherical triangle of the same size formed by dividing the entire spherical surface into 20 equal parts. The golf ball designing method according to claim 1, wherein, thereafter, the first circle is arranged inside the first spherical triangle so as to contact the first circle arranged on the side.   The golf ball design method according to claim 2, wherein the number of first circles arranged on each side of the first spherical triangle in the first circle arranging step is an even number.   A golf ball manufacturing mold, which manufactures a golf ball designed by the golf ball designing method according to claim 1.   A golf ball manufactured by the golf ball manufacturing die according to claim 4.

Images