JP6768881B2 - Golf ball dimple pattern - Google Patents

Description

The present invention relates to a golf ball, and more particularly to a golf ball that holds a specially packed dimple pattern. More specifically, the present invention creates irregular domains based on a polyhedron, packs the irregular domains with dimples, and dimples the surface of the golf ball by sprinkling these domains on the surface of the golf ball. Regarding how to arrange.

Historically, dimple patterns have come with a great many types of geometry, appearance and structure. Basically, the layout of the pattern achieves the desired performance characteristics based on the individual ball structure, material characteristics, and player characteristics that affect the initial launch conditions of the ball. Therefore, pattern development is a secondary design process that is used to match the desired aerodynamic behavior and finish the ball's flight characteristics and performance.

The aerodynamic force generated when a ball flies is the product of its velocity and spin. These forces can be expressed as lift and drag. Lift is perpendicular to the direction of flight and is the result of the difference in air velocity between the top and bottom caused by the rotation of the ball. This phenomenon is largely owed to the Magnus, who explained it in 1853 after studying the aerodynamic forces applied to the rotating spheres and cylinders, which is Bernui's law, the first of aerodynamics. It is described by a simplification of the law. Bernoulli's law shows the relationship between pressure and velocity when pressure is proportional to the square of velocity. The velocity difference, that is, the faster air movement on the upper side and the slower air movement on the lower side, reduces the air pressure on the upper side of the ball and creates an upward force on the upper side of the ball.

Drag is, on the one hand, opposite to the direction of flight and orthogonal to lift. The drag on the ball owes to the parasitic drag, which includes the shape or pressure drag and the viscous or epidermal friction drag. A sphere is an object that forms a wall and is itself an aerodynamically inefficient shape. As a result, the field of acceleration flow around the ball creates a large pressure difference between the high pressure on the front of the ball and the low pressure on the back of the ball. The low pressure on the back of the ball is also known as a wake. To reduce pressure drag, dimples provide a means of activating the flow field behind the ball to delay flow separation or reduce the wake area. Epidermal friction is a viscous effect that exists close to the surface of the ball in the boundary region.

Although many efforts have been made in the industry through dimple turbulence to maximize the aerodynamic efficiency of golf balls, the industry is the national governing body for golf, the United States Golf Association (U.S.A.). It is closely managed by SGA). One of the USGA regulations is that golf balls are aerodynamically symmetric. Aerodynamic symmetry allows the golf ball to fly with little change, no matter how it is placed on the tee or on the ground. Preferably, the dimples cover the maximum surface area of the golf ball without adversely affecting the aerodynamic symmetry of the golf ball.

To improve aerodynamic symmetry, many dimple patterns are based on geometry. These will include circles, hexagons, triangles, etc. Other dimple patterns are generally based on five Platonic solids, which include icosahedrons, dodecahedrons, octahedrons, cubes, or tetrahedra. Yet other dimple patterns are 13 archimedean solids, such as small icosidodecahedron, rhombic icosidodecahedron, small rhombic cube octahedron, twisted cube, twisted dodecahedron, or truncated icos. Based on the dodecahedron. In addition, other dimple patterns are based on a hexagonal dopyramid. Due to the limited number of symmetric three-dimensional plane systems, it is difficult to devise new symmetric patterns. Moreover, dimple patterns based on some of these geometries do not result in ideal surface coverage and also result in other detrimental dimple arrangements. Therefore, attempts have been made to produce golf balls whose dimple properties, such as number, shape, size, volume, and arrangement, are often manipulated to improve aerodynamic properties.

U.S. Pat. No. 5,562,552 (Turman, Patent Document 1) discloses a golf ball with an icosahedron dimple pattern, where each triangular face of the icosahedron is the corner of the face. Is divided into two equal parts to form three triangular faces for each icosahedron face, and the dimples are consistently arranged in an icosahedron face shape.

U.S. Pat. No. 5,046,742 (Mackey, Patent Document 2) discloses a golf ball in which dimples are packed in a 32-sided polyhedron consisting of hexagons and pentagons, in which each hexagon and each pentagon. The dimple packs are the same.

U.S. Pat. No. 4,998,733 (Lee. Patent Document 3) discloses a golf ball consisting of 10 "spherical" hexagons, each of which is divided into six equilateral triangles, each of which is here. The triangle is divided by a bisector extending between the apex and the midpoint of the side facing the apex, and the bisector is oriented to improve symmetry.

U.S. Pat. No. 6,682,442 (Winfield, Patent Document 4) uses polygons as pack elements for dimples and introduces a predictable variance into the dimple pattern. The polygon extends from the pole of the ball to the separation line. Any space in a polygon that is not filled with dimples is filled with other dimples.

U.S. Pat. No. 5,562,552 U.S. Pat. No. 5,046,742 U.S. Pat. No. 4,998,733 U.S. Pat. No. 6,682,442

In one embodiment, the invention is directed to a golf ball having an outer surface with separation lines and multiple dimples. The dimples are arranged into multiple copies of one or more irregular domains covering the outer surface with a uniform pattern. Irregular domains are defined by non-linear segments, with one of each non-linear segment of multiple copies of the irregular domain forming a separator line.

In another embodiment, the invention is directed to a method of arranging multiple dimples on the surface of a golf ball. This method uses the midpoint / midpoint method to generate first and second irregular domains based on a tetrahedron, mapping the first and second irregular domains to a sphere, and the first. It involves packing the first and second irregular domains with dimples and sprinkling the first and second domains to coat the spheres in a uniform pattern. The midpoint / midpoint method supplies a single face of a tetrahedron with a first edge that connects to the second edge at the apex, and the midpoint of the first edge is the midpoint of the second edge. Connect with non-linear segments to rotate a copy of the segment around the communication of the face so that the segment and its copy fully surround the center and the first irregular domain surrounded by the segment and copy. It involves forming and rotating subsequent copies of the segment around the vertices to form a second irregular domain in which the segments and copies fully surround the vertices and are surrounded by the segments and subsequent copies.

In another embodiment, the invention is directed to a golf ball having an outer surface with a plurality of dimples, where the dimples are arranged in the following manner. That is, this method generates tetrahedral-based first and second irregular domains using the midpoint / midpoint method, and maps the first and second irregular domains to spheres. , The first and second irregular domains are packed with dimples, and the first and second domains are interspersed to cover the sphere with a uniform pattern.

In another embodiment, the present invention relates to a golf ball having an outer surface including a plurality of dimples arranged on the golf ball. The dimples are placed in multiple copies of the first domain and the second domain, where the first domain and the second domain do not have a large circle consisting of four first domains and four second domains. It is mosaicked to cover the outer surface of the golf ball with a uniform pattern. The dimple pattern in the first domain is different from the dimple pattern in the second domain. The dimples include dimples having at least two different diameters, including a maximum dimple diameter and a minimum dimple diameter. The first domain and the second domain consist of peripheral dimples and inner dimples, respectively. In a particular aspect of this embodiment, the peripheral dimples of the first domain consist of dimples having no more than two different diameters, and the peripheral dimples of the second domain consist of dimples having at least two different diameters. The perimeter dimples are the maximum dimple diameter. In another particular aspect of this embodiment, the internal dimples of the first domain consist of dimples having at least three different diameters, and the internal dimples of the second domain consist of dimples having no more than two different diameters. It is the minimum dimple diameter in the first domain, and the diameter of at least one dimple in the second domain is the minimum dimple diameter. In another particular aspect of this embodiment, none of the peripheral dimples of the first domain has a diameter that is the maximum or minimum dimple diameter, and at least one diameter of the peripheral dimples of the second domain is the maximum dimple diameter. Yes, at least one diameter of the peripheral dimples in the second domain is the minimum dimple diameter.

The accompanying drawings should form part of the specification and be understood in relation to it, in which similar reference numbers are used to indicate similar parts in the various drawings.

A golf ball in which dimples are arranged by the method of the present invention is shown. Shows a polyhedral face. The elements of the present invention in the polyhedral mace of FIG. 1B are shown. Shown shows a domain produced by the method of the invention, packed with dimples, and formed from the two elements of FIG. 1C. Shows a single face of a polyhedron with control points. Shows a polyhedral face. The elements of the invention packed with dimples are shown. The domain of the invention is shown packed with dimples generated from the elements of FIG. 3B. FIG. 3 shows a golf ball formed by the method of the invention generated from the domain of C. Two polyhedral faces are shown. The first domain of the invention in the two polyhedral faces of FIG. 4A is shown. The first domain and the second domain of the present invention in the three polyhedral faces are shown. FIG. 4 shows a golf ball formed by the method of the invention generated from the domain of C. Shows a polyhedral face. The first domain of the present invention in a polyhedral face is shown. The first domain and the second domain of the present invention in a polyhedral face are shown. A golf ball formed by the method of the present invention generated from the domain of FIG. 5C is shown. Shows a polyhedral face. A part of the domain of the present invention in a polyhedral face is shown. The domain generated by the method of this invention is shown. A golf ball formed by the method of the present invention generated from the domain of FIG. 6C is shown. Shows a polyhedral face. The domain of the present invention in the polyhedral face of FIG. 7A is shown. The golf ball formed by this method of first smile is shown. The first element of the present invention in a polyhedral face is shown. The first element and the second element of this invention in the polyhedral face of FIG. 8A are shown. The two domains of the invention, which consist of the first and second elements of FIG. 8B, are shown. A single domain of the invention based on the two domains of FIG. 8C is shown. FIG. 8 shows a golf ball formed by the method of the invention generated from the domain of FIG. 8D. Shows a polyhedral face. The elements of the present invention in the polyhedral face of FIG. 8A are shown. The two elements of FIG. 9B that are combined to form one domain of the invention are shown. The domain generated by the method of the present invention, based on the elements of FIG. 9C, is shown. FIG. 9 shows a golf ball formed by the method of the invention generated from the domain of FIG. 9D. Shows the face of a rhombic dodecahedron. The segment of the invention in the face of FIG. 10A is shown. The segment of FIG. 10B and a copy thereof which generate the domain of this invention are shown. The domain generated by the method of the present invention, based on the segment of FIG. 10C, is shown. FIG. 10 shows a golf ball formed by the method of the invention generated from the domain of FIG. 10D. Shows a tetrahedron projected onto a sphere. The first domain of the present invention in the tetrahedral face of FIG. 11A is shown. The first domain and the second domain of the present invention projected on the sphere are shown. The domains of FIG. 11C are shown so as to cover the surface of the sphere. A part of a golf ball formed by using the method of the present invention is shown. The other part of the golf ball formed by using the method of this invention is shown. A golf ball formed by using the method of the present invention is shown. It is a figure which shows a part of the golf ball formed by using the method of this invention. It is a figure which shows another part of the golf ball formed by using the method of this invention. It is a figure which shows the golf ball formed by using the method of this invention. It is a figure which shows a part of the golf ball formed by using the method of this invention. It is a figure which shows another part of the golf ball formed by using the method of this invention. It is a figure which shows another part of the golf ball formed by using the method of this invention. It is a figure which shows a part of the golf ball formed by using the method of this invention. It is a figure which shows another part of the golf ball formed by using the method of this invention. It is a figure which shows another part of the golf ball formed by using the method of this invention. It is a figure which shows the method of determining the nearest neighbor dimple. It is a figure which shows the method of determining the nearest neighbor dimple. It is the schematic which shows the method of measuring the diameter of a dimple.

The present invention provides a method of arranging dimples on a golf ball surface in a pattern derived from at least one irregular domain generated from a regular or irregular polyhedron. This method selects control points on a polyhedron, connects the control points to non-linear sketch lines, patterns the sketch lines in the first aspect to generate irregular domains, and optionally a second. Patterning sketch lines in an embodiment to generate additional irregular domains, packing irregular domains with dimples and sprinkling irregular domains to cover the surface of the golf ball with a uniform pattern. including. Control points include the center of the polyhedral face, the vertices of the polyhedron, the midpoint or other points on the edges of the polyhedron, and others. According to this method, the symmetry of the underlying polyhedron can be maintained, and the large circle due to the separation line derived from the molding process can be reliably minimized or removed.

As shown in FIG. 1A, in a specific embodiment, the invention involves a golf ball 10 with dimples 12. The dimples 12 are arranged by packing the irregular domains 14 with dimples, as best shown in FIG. 1D. The irregular domains 14 are generated in such a way that they impart more symmetry than conventional balls when they are studded on the surface of the golf ball 10. The irregular shape of the domain 14 minimizes the appearance and effect of the golf ball separation line from the molding process and gives the dimple arrangement more flexibility than is available in the regularly shaped domain. ..

For the purposes of the present invention, "irregular domain" refers to a domain that is at least one, preferably not all, straight with the ship's surface that defines the boundaries of the domain.

Irregular domains can be defined using any one of the case studies described here. Each method produces one or more unique domains based on surrounding the sphere with regular polyhedra. The vertices of the enclosed sphere based on the vertices of the corresponding polyhedron at the origin (0, 0, 0) are defined in Table 1 as follows.

Each method entails unique rules for domains that should be symmetrically patterned on the surface of the golf ball: Each method is defined by a combination of at least two control points. These control points are taken from one or more faces of a regular or irregular polyhedron and consist of at least three types, which are the center C of the polyhedron face; the vertices V of the regular polyhedron, It is the midpoint M of the edge of the face of the polyhedron. FIG. 2 shows an example face 16 of a polyhedron (regular dodecahedron in this example), one of each center C, a midpoint M, a vertex V, and an edge E of the face 16. The two control points C, M, or V may be of the same or different types. Therefore, the six methods used with regular polyhedra are defined as follows.
1. 1. From the center to the midpoint (C → M)
2. From center to center (C → C)
3. 3. From the center to the apex (C → V)
4. Midpoint to midpoint (M → M)
5. Midpoint to vertex (M → V)
6. From vertex to vertex (V → V)

Each method is different in detail, but all follow the same basic scheme. First, a non-linear sketch line is drawn to connect the two control points. The sketch lines may be of any shape and include, but are not limited to, arcs, splines, two or more straight lines, arcs or curves, or combinations thereof. Second, the sketch lines are patterned in a manner specific to the method of forming the domain, which will be discussed below. Third, if necessary, the sketch lines are patterned in a second aspect that creates a second domain.

Here, with reference to FIGS. 5A-5D and 11A-11G, the midpoint to midpoint method produces two domains interspersed to cover the surface of the golf ball 10. This domain is defined as follows.
1. 1. Regular polyhedra are selected (FIGS. 5A-5D use dodecahedrons and FIGS. 11A-11G use tetrahedrons);
2. One single face 16 of a regular polyhedron is projected onto the sphere, which is shown in FIGS. 5A and 11A;
3. 3. Second midpoint M2 of the edge _{E 2} are connected by the segment 18 adjacent to the first center point _{M 1} of the edge _{E 1,} and the first edge _{E 1} of the face 16, which in FIGS. 5A and 11A Show;
4. The segments 18 to produce a first domain 14a is rotated at equal rotational angle and rotation at 360 / _{P E} of the center C of the face 16, which is shown in FIGS. 5A and 11A;
5. Segment 18 defines element 22 along with the portion of the first edge E ₁ and the second edge E ₂ between the midpoints M ₁ and M ₂ , which are shown in FIGS. 5B and 11B;
6. Around the vertex V connecting the edges E ₁ and E ₂ , the element 22 is patterned to generate a second domain 14b, which is shown in FIGS. 5C and 11C. The number of segments in the pattern to generate a second domain is equal to _{P F × P E / P V} .

And the first domain 14a and the second domain 14b is sprinkled as shown in FIG. 5D and 11D when covering the surface of the golf ball 10, full domain 14a and 14b of different numbers of control points _{M 1} and depending on the selected regular polyhedron M ₂ as a basis, provided. The number of first and second domains 14a and 14b which are employed to cover the surface of the golf ball 10, the first domain 14a is _{P F,} the second domain 14b is an _{P V} , This is as shown in Table 5 below.

In a specific aspect of the embodiment shown in FIGS. 11A-11D, the segment 18 forms part of the separation line of the golf ball 10. Thus, when the domains are studded to cover the direction of the ball, the segment 18 forms with each of its copies produced by steps 4 and 6 above, the truth of the ball and two false separation lines.

After the irregular domains have been generated using any of the methods described above, the domains may be dimple-packed for use in the creation of the golf ball 10.

As shown in FIGS. 11E-11P, a first domain and a second domain are created using the tetrahedral-based midpoint to midpoint method. FIG. 11E shows a first domain 14a filled with dimples and a part of the second domain 14b, and the dimples of the first domain 14a are indicated by the letter a. FIG. 11F shows a second domain 14b filled with dimples and a part of the first domain 14a, and the dimples of the second domain 14b are indicated by the letter b. FIG. 11G shows the first domain 14a and the second domain 14b filled with dimples and studded so as to cover the surface of the golf ball 10.

FIG. 11H shows a first domain 14a filled with dimples and a part of a second domain 14b filled with dimples, but the dimples are in the domain in a pattern different from that shown in FIG. 11E. It will be packed. In FIG. 11H, the first domain 14a is shown by shading. FIG. 11I shows the second domain 14b and a portion of the first domain 14a together with dimples filled into the domain in the same pattern as shown in FIG. 11H. In FIG. 11I, the second domain 14b is shown by shading. 11J shows the dimple-filled first and second domains according to the examples shown in FIGS. 11H and 11I, which are studded so as to cover the surface of the golf ball 10.

FIG. 11K shows a dimple-filled first domain 14a and a portion of the second domain 14b. FIG. 11L shows a portion of the first domain 14a and a second domain 14b filled with dimples. FIG. 11M shows the dimple-filled first and second domains according to the examples shown in FIGS. 11K and 11L.

FIG. 11N shows a dimple-filled first domain 14a and a portion of the second domain 14b. FIG. 11O shows a portion of the first domain 14a and a second domain 14b filled with dimples. FIG. 11P shows the dimple-filled first and second domains according to the examples shown in FIGS. 11N and 11O.

In a specific embodiment, as shown in FIGS. 11E-11P, the dimple pattern of the first domain is three-way rotational symmetry around the center point of the first domain. ), And the dimple pattern of the second domain has three-way rotational symmetry around the center point of the second domain.

In one embodiment, there are no restrictions on how the dimples are packed. In another embodiment, the dimples are packed so that the dimples do not intersect the line segment. In the embodiments shown in FIGS. 11E-11P, the dimples are filled into the first domain in a pattern different from that of the second domain.

In a specific embodiment, the dimples are packed so that all closest adjacent dimples are separated by substantially the same distance δ, with the average of all δ values 0.002 inches to 0.020 inches. Yes, the individual delta values vary by ± 0.005 inches from the mean value. In the present invention, the closest adjacent dimples are determined according to the following method. The two tangents are drawn from the center of the first dimple to the potential closest adjacent dimple. Next, a line segment is drawn connecting the center of the first dimple and the center of the next potential closest adjacent dimple. If two tangents and lines do not intersect other dimple edges, then those dimples are considered nearest neighbors. For example, as shown in FIG. 12A, two tangents 3A and 3B from the center of the first dimple 1 are drawn on the potentially closest adjacent dimple 2. A line segment 4 is then drawn to connect the center of the first dimple 1 with the potentially closest center of the adjacent dimple 2. Lines 3A and 3B and line segment 4 do not intersect the edges of other dimples, so dimples 1 and 2 are considered nearest neighbors. As shown in FIG. 12B, two tangents 3A and 3B are drawn from the center of the first dimple 1 to the potentially closest adjacent dimple 2. The line segment 4 is drawn by connecting the center of the first dimple 1 and the center of the adjacent dimple 2 which is potentially closest to the center. Dimples 1 and 2 are not considered nearest neighbors because lines 3A and 3B intersect alternating dimples. Those skilled in the art will understand that it is not really necessary to draw a line segment on a golf ball. Rather, a computer modeling program capable of automatically performing this operation is preferably used.

ここで、Ａはディンプルの平面形状面積である。直径測定値は、図１３に従う完成したゴルフボールについて決定される。一般に、ボールの乱れのないランド表面からディンプルを分割する境界の不明瞭な性質のために、ディンプルの直径を測定することは困難であろう。塗料および／またはディンプルの設計自体の影響により、ランド表面とディンプルとの間の接合部は、鋭角ではない場合があり、そのため不明瞭である。これは、ディンプルの直径の測定を幾分曖昧にする。この問題を解決するために、完成したゴルフボールのディンプル直径を、図１３に示す方法に従って測定する。図１３は、ディンプル中心線３１からディンプル３３の外側のランド表面まで延びるディンプルの半分のプロファイル３４を示している。ボール仮想表面３２は、ディンプルの上にランド面３３から連続するものとして構成されている。第１の接線Ｔ１は仮想表面３２から半径方向内側に０．００３インチ離間したディンプル側壁上の点に構築される．Ｔ１は公称ディンプルエッジ位置を定める点Ｐ１で仮想表面３２と交差する。つぎに、第２の接線Ｔ２が、Ｐ１において仮想表面３２に接して構成されている。エッジ角はＴ１とＴ２の間の角度です。ディンプル直径は、Ｐ１とディンプル周囲に沿って直径方向に対向する等価点との間の距離である。あるいは、中心線３１に垂直な方向に測定された、Ｐ１とディンプル中心線３１との間の距離の２倍である。ディンプル深さは、ボールの仮想表面からディンプル上の最も深い点までのボール半径に沿って測定される距離である。ディンプル容積は、仮想表面３２とディンプル表面３４（ファントム表面と交差するまでＴ１に沿って延在する）との間に囲まれた空間である。 Each dimple typically has a diameter within a range having a lower limit of 0.050 or 0.100 inches and an upper limit of 0.205 or 0.250 inches. The diameter of the dimples having a non-circular planar shape is defined by the equivalent diameter d _e, which is calculated as follows.

Here, A is the planar shape area of the dimples. Diameter measurements are determined for the finished golf ball according to FIG. In general, it will be difficult to measure the diameter of the dimples due to the obscure nature of the boundaries that divide the dimples from the undisturbed land surface of the ball. Due to the influence of the paint and / or the dimple design itself, the joint between the land surface and the dimples may not be sharp and therefore obscured. This makes the measurement of dimple diameter somewhat ambiguous. To solve this problem, the dimple diameter of the finished golf ball is measured according to the method shown in FIG. FIG. 13 shows a profile 34 of half of the dimples extending from the dimple centerline 31 to the outer land surface of the dimples 33. The ball virtual surface 32 is configured to be continuous from the land surface 33 on the dimples. The first tangent T1 is constructed at a point on the dimple side wall that is 0.003 inches radially inward from the virtual surface 32. T1 intersects the virtual surface 32 at a point P1 that determines the nominal dimple edge position. Next, the second tangent line T2 is configured to be in contact with the virtual surface 32 at P1. The edge angle is the angle between T1 and T2. The dimple diameter is the distance between P1 and the diametrically opposed equivalence points along the perimeter of the dimple. Alternatively, it is twice the distance between P1 and the dimple centerline 31 measured in the direction perpendicular to the centerline 31. Dimple depth is the distance measured along the radius of the ball from the virtual surface of the ball to the deepest point on the dimple. The dimple volume is the space enclosed between the virtual surface 32 and the dimple surface 34 (which extends along T1 until it intersects the phantom surface).

In a specific embodiment, all dimples on the outer surface of the ball have the same diameter. It should be understood that "same diameter" dimples include dimples on finished balls having different diameters by less than 0.005 inches due to manufacturing variability.

In other specific embodiments, there are two or more different dimple diameters on the outer surface of the ball, including a maximum dimple diameter and a minimum dimple diameter. In a specific aspect of this embodiment, the dimples are placed in multiple copies of the first domain and the second domain formed according to the method from midpoint to midpoint based on the tetrahedron, the first domain and The second domain covers the surface of the golf ball with a uniform pattern without great circles. The overall dimple pattern consists of four first domains and four second domains. The dimple pattern in the first domain is different from the dimple pattern in the second domain. Each of the first and second domains consists of peripheral dimples and internal dimples.

In the first more specific aspect of this embodiment, the peripheral dimples of the first domain consist of dimples having no more than two different diameters, and the peripheral dimples of the second domain are dimples having at least two different diameters. The diameter of at least one peripheral dimple is the maximum dimple diameter. The dimples optionally have one or more of the following additional properties:
a) The diameter of at least one peripheral dimple in the first domain is the maximum dimple diameter.
b) The diameter of at least one peripheral dimple in the second domain is the maximum dimple diameter.
c) The diameter of at least one internal dimple is the maximum dimple diameter.
d) The diameter of at least one internal dimple in the first domain is the maximum dimple diameter.
e) The diameter of at least one internal dimple in the second domain is the maximum dimple diameter.
f) The diameter of at least one dimple in the first domain is the minimum dimple diameter.
g) None of the peripheral dimples in the first domain has a diameter that is the minimum dimple diameter.
h) At least one diameter of the peripheral dimples of the first domain is the minimum dimple diameter.
i) None of the dimples inside the first domain have a diameter that is the smallest dimple diameter.
j) At least one diameter of the internal dimples of the first domain is the minimum dimple diameter.
k) The diameter of at least one dimple in the second domain is the minimum dimple diameter.
l) None of the peripheral dimples in the second domain has a diameter that is the minimum dimple diameter.
m) The diameter of at least one peripheral dimple in the second domain is the minimum dimple diameter.
n) None of the internal dimples in the second domain have a diameter that is the minimum dimple diameter.
o) The diameter of at least one internal dimple in the second domain is the minimum dimple diameter.
p) There are three or more different dimple diameters on the outer surface of the ball.
q) There are four or more different dimple diameters on the outer surface of the ball.
r) There are 5 or more different dimple diameters on the outer surface of the ball.
s) Peripheral dimples in the second domain consist of dimples with at least three different diameters.
t) The internal dimples of the first domain consist of dimples with at least three different diameters.
u) The internal dimples of the second domain consist of dimples with two or more different diameters.
v) The internal dimples of the second domain consist of dimples with at least three different diameters. And
w) The number D of different dimple diameters on the outer surface is related to the total number N of dimples on the outer surface according to one of the specific examples further disclosed below.

In the second, more specific aspect of this embodiment, the internal dimples of the first domain consist of dimples with at least three different diameters, and the internal dimples of the second domain are dimples with no more than two different diameters. At least one dimple in the first domain is the smallest dimple diameter and the diameter of at least one dimple in the second domain is the smallest dimple diameter. The dimples optionally have one or more of the following additional properties:
a) There are four or more different dimple diameters on the outer surface of the ball.
b) There are 5 or more different dimple diameters on the outer surface of the ball.
c) None of the peripheral dimples in the first region has a diameter that is the minimum dimple diameter.
d) At least one diameter of the peripheral dimples of the first domain is the minimum dimple diameter.
e) None of the internal dimples in the first domain have a diameter that is the minimum dimple diameter.
f) At least one diameter of the internal dimples of the first domain is the minimum dimple diameter.
g) None of the peripheral dimples in the second domain has a diameter that is the minimum dimple diameter.
h) The diameter of at least one peripheral dimple in the second domain is the minimum dimple diameter.
i) None of the internal dimples in the second domain have a diameter that is the minimum dimple diameter.
j) The diameter of at least one internal dimple in the second domain is the minimum dimple diameter.
k) The diameter of at least one internal dimple is the maximum dimple diameter.
l) The diameter of at least one internal dimple in the first domain is the maximum dimple diameter.
m) The diameter of at least one internal dimple in the second domain is the maximum dimple diameter. And
n) Peripheral dimples in the second domain consist of dimples with at least three different diameters.

In the third more specific aspect of this embodiment, none of the peripheral dimples of the first domain has a diameter that is the maximum or minimum dimple diameter, and at least one diameter of the peripheral dimples of the second domain is the maximum. It is a dimple, and the diameter of at least one of the peripheral dimples of the second domain is the minimum dimple diameter.

For the purposes of the disclosure, each dimple on the outer surface of the golf ball is either a peripheral dimple or an internal dimple and is entirely located in either the first domain or the second domain. Peripheral dimples are dimples that are directly adjacent to the boundary segment. Peripheral dimples for a given domain are dimples located inside that domain and, in a specific embodiment, form an axisymmetric pattern around the geometric center of the domain. Internal dimples are dimples that are not directly adjacent to the boundary segment. The internal dimples of a given domain are dimples located within the domain and, in a concrete example, form an axisymmetric pattern with respect to the geometric center of the domain.

For example, in the examples shown in FIGS. 11K and 11N, the shaded dimples indicate the peripheral dimples of the first domain 14a, and the unshaded dimples indicate the internal dimples of the first domain 14a. In the examples shown in FIGS. 11L and 11O, the shaded dimples indicate the peripheral dimples of the second domain 14b, and the unshaded dimples indicate the internal dimples of the second domain 14b. And FIGS. 11M and 11P show the first and second domains packed with dimples according to the examples shown in FIGS. 11K-11L and 11N-11O, respectively, which are shaded in FIGS. 11M and 11P, respectively. Dimples that are used indicate outer dimples, and dimples that are not shaded indicate internal dimples.

In FIGS. 11K-11M, the alphabetical labels within the dimples indicate dimples of the same diameter. For example, all dimples labeled A have the same diameter, all dimples labeled B have the same diameter, and so on. In a specific aspect of the embodiment illustrated in FIGS. 11K-11M, the dimples shown in A have a diameter of about 0.130 inches and the dimples labeled in B have a diameter of about 0.160 inches. The dimples labeled with C have a diameter of about 0.170 inches and the dimples represented by D have a diameter of 0.175 inches. Therefore, according to the embodiment shown in FIG. 11M, when the first domain 14a and the second domain 14b are cut around the outer surface of the golf ball, the total dimple pattern obtained is a total of 352 dimples. Has a maximum dimple diameter of 0.175 inches and four different dimple diameters including a minimum dimple diameter of 0.130 inches. The examples shown in FIGS. 11K to 11M additionally have the following features.
a) Peripheral dimples in the first domain consist of dimples with two different diameters.
b) None of the peripheral dimples in the first domain has a diameter that is the maximum dimple diameter.
c) None of the peripheral dimples in the first domain has a diameter that is the minimum dimple diameter.
d) The peripheral dimples of the second domain consist of dimples with three different diameters.
e) The diameter of at least one peripheral dimple in the second domain is the maximum dimple diameter.
f) The diameter of at least one peripheral dimple in the second domain is the minimum dimple diameter.
g) The internal dimples of the first domain consist of dimples with three different diameters.
h) The diameter of at least one internal dimple in the first domain is the maximum dimple diameter.
i) At least one diameter of the internal dimples of the first domain is the minimum dimple diameter.
j) The internal dimples of the second domain consist of dimples with two different diameters.
k) The diameter of at least one internal dimple in the second domain is the maximum dimple diameter. And
l) None of the internal dimples in the second domain have a diameter that is the minimum dimple diameter.

In FIGS. 11N-11P, the alphabetical labels within the dimples indicate dimples of the same diameter. For example, all dimples labeled A have the same diameter, all dimples labeled B have the same diameter, and so on. In a specific aspect of the embodiment shown in FIGS. 11N-11P, the dimples indicated by A have a diameter of about 0.125 inches and the dimples labeled with B have a diameter of about 0.148 inches. However, the dimples labeled with C have a diameter of about 0.166 inches, the dimples represented by D have a diameter of about 0.176 inches, and the dimples labeled E have a diameter of about 0.198 inches. Has a diameter of. Then, according to the embodiment shown in FIG. 11P, when the first domain 14a and the second domain 14b are cut around the outer surface of the golf ball, the overall dimple pattern obtained is a total of 328 dimples. It has a maximum dimple diameter of 0.198 and has five different dimple diameters, including a minimum dimple diameter of 0.125 inches. The embodiment shown in FIG. 111N-11P additionally has the following features.
a) The outer peripheral dimples of the first domain consist of dimples with two different diameters.
b) The diameter of at least one peripheral dimple in the first domain is the maximum dimple diameter.
c) None of the peripheral dimples in the first domain has a diameter that is the minimum dimple diameter.
d) The peripheral dimples of the second domain consist of dimples with three different diameters.
e) None of the peripheral dimples in the second domain has a diameter that is the maximum dimple diameter.
f) The diameter of at least one peripheral dimple in the second domain is the minimum dimple diameter.
g) The internal dimples of the first domain consist of dimples with three different diameters.
h) None of the dimples inside the first domain have a diameter that is the maximum dimple diameter.
i) At least one diameter of the internal dimples of the first domain is the minimum dimple diameter.
j) The internal dimples of the second domain consist of dimples with four different diameters.
k) The diameter of at least one internal dimple in the second domain is the maximum dimple diameter. And
l) The diameter of at least one internal dimple in the second domain is the minimum dimple diameter.

In a specific aspect of the embodiments disclosed herein having two or more different dimple diameters on the outer surface of the ball, the number of different dimple diameters D on the outer surface is related to the total number N of dimples on the outer surface. And
If N <312, then D ≦ 5,
If N = 312, then D ≦ 4,
If 312 <N <328, D ≦ 5,
If N = 328, then D ≦ 6,
If 328 <N <352, then D ≦ 5,
If N = 352, then D ≦ 4,
If 352 <N <376, then D ≦ 5,
If N = 376, then D ≦ 7, and
If N> 376, then D ≦ 5.

In the embodiment shown in FIG. 11J, the total number of dimples on the outer surface of the ball is 300, and the number of different dimple diameters is four. In FIGS. 11H and 11I, the label numbers within the dimples indicate dimples of the same diameter. For example, all dimples labeled 1 have the same diameter, all dimples labeled 2 have the same diameter, and so on. In a specific aspect of the embodiment shown in FIGS. 11H and 11I, the dimples labeled 1 have a diameter of about 0.170 inches and the dimples labeled 2 have a diameter of about 0.180 inches. The dimples labeled 3 have a diameter of about 0.150 inches and the dimples labeled 4 have a diameter of 0.190 inches.

In another specific aspect of the embodiments disclosed herein where there are two or more different dimple diameters on the outer surface of the ball, the number of different dimple diameters D on the outer surface is the total number of dimples on the outer surface. Related to N,
If N <320, D ≦ 4,
If 320 ≤ N <350, then D ≤ 6,
If 350 ≤ N <360, then D ≤ 4 and
If N ≧ 360, then D ≦ 7.

In another specific aspect of the embodiments disclosed herein where there are two or more different dimple diameters on the outer surface of the ball, the number of different dimple diameters D on the outer surface is the total number of dimples on the outer surface. Related to N,
If N <328, then D> 5,
If N = 328, D> 7,
If 328 <N <376, D> 5,
If N = 376, then D> 8 and
If N> 376, then D> 5.

In another specific aspect of the embodiments disclosed herein where there are two or more different dimple diameters on the outer surface of the ball, the number of different dimple diameters D on the outer surface is the total number of dimples on the outer surface. Related to N,
If N <320, D ≧ 6,
If 320≤N <350, then D≥7,
If 350 ≤ N <360, then D ≥ 6 and
If N ≧ 360, then D ≧ 9.

ここで、ｘ_ｉはボールの外面上の任意のディンプルの直径であり、ｘは平均ディンプル直径であり、Ｎはボールの外面上のディンプルの総数である。 In a more specific aspect of the above embodiment where there are two or more different dimple diameters on the outer surface of the ball, the total number of dimples on the outer surface is less than 320, the number of different dimple diameters is equal to 4 and the sample. The standard deviation is less than 0.0175. In another more specific aspect of the above embodiment where there are two or more different dimple diameters on the outer surface of the ball, the total number of dimples on the outer surface is 320 or more and less than 350, and the different dimple diameters are 6 or less. The sample standard deviation is less than 0.0200. In another more specific aspect of the above embodiment where there are two or more different dimple diameters on the outer surface of the ball, the total number of dimples on the outer surface is 350 or more and less than 360, and the different dimple diameters are 4 or less. The sample standard deviation is less than 0.0155. In another more specific aspect of the above embodiment where there are two or more different dimple diameters on the outer surface of the ball, the total number of dimples on the outer surface is 360 or greater and the number of different dimple diameters is 7 or less. , The sample standard deviation is less than 0.0200. The sample standard deviation s is defined by the following equation.

Where x _i is the diameter of any dimple on the outer surface of the ball, x is the average dimple diameter, and N is the total number of dimples on the outer surface of the ball.

It should be understood that manufacturing variability should be taken into account when determining the number of different dimple diameters. It is also necessary to consider the placement of the entire dimple in the pattern. Specifically, it is assumed that dimples located at the same location in multiple copies of the domains spliced together to form a dimple pattern are dimples of the same diameter unless they differ by more than 0.005 inches in diameter. Will be done.

There are no restrictions on the shape or profile of the dimples selected to pack the domain. Although the invention comprises substantially circular dimples in one embodiment, dimples or protrusions (brambles) with any desired property and / or feature may be employed. For example, in one embodiment, the dimples may be associated with various shapes and dimensions, including the depth and perimeter of the sy tree. Specifically, the dimples may be a recessed hemisphere and may be a triangle, square, hexagon, catenary, polygon, or any other shape known to those of skill in the art. These may have straight lines, curves, sloping edges or sides. In summary, any type of dimples or protrusions (brambles) known to those of skill in the art may be employed with the present invention. As can be seen in FIGS. 1A, 1D, and 11E-11G, as long as the dimple sequence in each of the independent domains is consistent across all copies of the domain on the surface of the concrete golf ball. In addition, the dimples may all fit within each domain, or as can be seen in FIGS. 3C-3D, the dimples may be shared by one or more domains. Alternatively, the studs form a pattern that covers more than about 60%, preferably more than about 70%, and even more preferably more than about 80% of the golf ball direction without adopting dimples. it can.

In other embodiments, the domain does not have to be dimple-packed and the irregular domain boundaries may instead have ridges or grooves. In a golf ball with this type of irregular domain, one or more domains or pairs of domains overlap to increase the surface coverage of the groove. Alternatively, irregular domain boundaries may have ridges or grooves, and these domains are dimple-packed.

When the domain is patterned in the direction of the golf ball, the arrangement of the domain, defined by the shape of the domain and the underlying polyhedron, results in a golf ball with a higher degree of symmetry, which is 12 Equal or greater. The order of symmetry of a golf ball manufactured using the method of the present invention depends on the regular or irregular polygon on which the irregular domain is based. The order and type of symmetry of golf balls manufactured on the basis of five polyhedra are listed in Table 10 below.

Larger dimensions of symmetry have several advantages, including, but not limited to, equal dimple dispersion, greater pack efficiency potential, and improved means of masking ball separation lines. In addition, the dimple pattern generated by this method will result in improved flight stability and symmetry as a result of the large order of the proposed positive.

In another embodiment, the irregular domain does not completely cover the surface of the ball and there is open space in Aida of the dimple-filled or unfilled domain. This allows asymmetry to be introduced into the ball.

The dimple pattern of the present invention is particularly suitable for packing dimples on a seamless golf ball. Seamless golf balls and methods of manufacturing them are further disclosed, for example, in US Pat. Nos. 6,849,007 and 7,422,529, the contents of which are incorporated herein by reference.

In a specific aspect of the embodiments disclosed herein, the golf ball of the present invention has a total number of dimples N on its outer surface, where N is an integer divisible by 4 and ranges from 260 to 424. Is inside. In another specific aspect, the golf ball of the present invention has a total number of dimples N on the outer surface of 300 or 312 or 328 or 348 or 352 or 376 or 388.

The aerodynamic properties of the golf ball of the present invention can be described by the magnitude of the aerodynamic coefficient and the angle of the aerodynamic force. In one embodiment, based on the dimple pattern produced according to the invention, the golf ball has a Reynolds number of 230000, an aerodynamic coefficient of 0.25 to 0.32, and an aerodynamic force angle of 30 °. At 38 °, the spin ratio is 0.085. In another embodiment based on the dimple pattern generated according to the present invention, the golf ball has a Reynolds number of 180,000, an aerodynamic coefficient of 0.26 to 0.33, and an aerodynamic force angle. The spin ratio is 0.101 from 32 ° to 40 °. In another embodiment based on the dimple pattern generated according to the present invention, the golf ball has a Reynolds number of 133000, an aerodynamic coefficient of 0.27 to 0.37, and an aerodynamic force angle. From 35 ° to 44 °, the ratio is 0.133. Based on the dimple pattern generated according to the present invention, in many embodiments, the golf ball has a Reynolds number of 89000, an aerodynamic coefficient of 0.32 to 0.45, and an aerodynamic force angle. It is 39 to 45 ° and has a spin ratio of 0.183. In the present disclosure, the magnitude of the aerodynamic coefficient _{(C mag)} is _C mag ₌ as defined in ^{_{(C L 2 + C D 2}} ) 1/2, the angle of the aerodynamic force _{(C angle)} is _C angle = tan ^-1 ( _CL / _CD ), where _CL is the lift coefficient and _CD is the drag coefficient. The aerodynamic properties of a golf ball, including the magnitude of the aerodynamic coefficient and the angle of the aerodynamic force, are disclosed, for example, in US Pat. No. 6,729,976 by Bissonnette et al. Is incorporated herein by reference. The magnitude of the aerodynamic coefficient and the value of the aerodynamic force angle are calculated using the average lift and drag values obtained when 30 balls were tested in random orientations. The Reynolds number is the average of the tests and can vary from plus or minus 3%. The spin ratio is the mean of the test and can vary from plus or minus 5%.

It should be understood that any combination of these numbers can be adopted when the lower and upper limits of the numbers are given here.

All patents, publications, test procedures and other references cited herein, including prior literature, are hereby incorporated by reference, to the extent consistent with the present invention.

Although exemplary embodiments of the present invention have been specifically described, various other modifications will be apparent to those skilled in the art and will be readily appreciated by those skilled in the art without departing from the spirit and scope of the invention. It is understood that it can be done. Therefore, the scope of the appended claims is not limited to the examples and descriptions described above, but rather the claims are configured to cover all of the novel patentable features inherent in the invention. It is intended to be, and this includes all features that one of ordinary skill in the art treats equally.
The technical features described here are listed below.
[Technical feature 1]
In a golf ball having an outer surface and having a plurality of dimples arranged on the outer surface.
The dimples are arranged in a plurality of replicas of the first domain and the second domain, and the first domain and the second domain do not have great circles and have four first domains. In a unified pattern with four of the second domains, they are joined together to cover the outer surface of the golf ball.
The dimple pattern inside the first domain is different from the dimple pattern inside the second domain.
The plurality of dimples have dimples having at least two different diameters including a maximum dimple diameter and a minimum dimple diameter.
The first domain consists of peripheral dimples and internal dimples, and the peripheral dimples of the first domain consist of two or less dimples of different diameters.
The second domain consists of peripheral dimples and internal dimples, and the peripheral dimples of the second domain consist of at least two different diameter dimples.
A golf ball characterized in that the diameter of at least one peripheral dimple is the maximum diameter of the dimples.
[Technical feature 2]
The technical feature that the first domain is three-fold rotationally symmetric around the center point of the first domain and the second domain is three-fold rotationally symmetric around the central point of the second domain. The golf ball described in 1.
[Technical feature 3]
The golf ball according to technical feature 1, wherein the diameter of at least one peripheral dimple in the first domain is the maximum dimple diameter, and the diameter of at least one peripheral dimple in the second domain is the maximum dimple diameter.
[Technical feature 4]
The golf ball according to technical feature 1, wherein the diameter of at least one internal dimple is the maximum diameter of the dimple.
[Technical feature 5]
The golf ball according to technical feature 1, wherein the diameter of at least one internal dimple in the first domain is the maximum dimple diameter, and the diameter of at least one internal dimple in the second domain is the maximum dimple diameter.
[Technical feature 6]
The golf ball according to technical feature 1, wherein the plurality of dimples are dimples having at least three different diameters.
[Technical feature 7]
The golf ball according to claim 1, wherein the peripheral dimples of the second domain are dimples having at least three different diameters.
[Technical feature 8]
The golf ball according to technical feature 1, wherein the plurality of dimples are dimples having at least four different diameters.
[Technical feature 9]
The golf ball according to technical feature 1, wherein the plurality of dimples are dimples having at least five different diameters.
[Technical feature 10]
In a golf ball having an outer surface and having a plurality of dimples arranged on the outer surface.
The dimples are arranged in a plurality of replicas of the first domain and the second domain, and the first domain and the second domain do not have great circles and have four first domains. In a unified pattern with four of the second domains, they are joined together to cover the outer surface of the golf ball.
The dimple pattern inside the first domain is different from the dimple pattern inside the second domain.
The plurality of dimples have dimples having at least three different diameters including a maximum dimple diameter and a minimum dimple diameter.
The first domain consists of peripheral dimples and internal dimples, and the internal dimples of the first domain consist of at least three different diameter dimples.
The second domain consists of peripheral dimples and internal dimples, and the internal dimples of the second domain consist of two or less dimples of different diameters.
The diameter of at least one dimple inside the first domain is the minimum dimple diameter.
A golf ball characterized in that the diameter of at least one dimple inside the second domain is the minimum dimple diameter.
[Technical Features 11]
The technical feature that the first domain is three-fold rotationally symmetric around the center point of the first domain and the second domain is three-fold rotationally symmetric around the central point of the second domain. 10. The golf ball according to 10.
[Technical feature 12]
The golf ball according to technical feature 10, wherein the plurality of dimples have at least four dimples having different diameters.
[Technical Feature 13]
The technical feature 10 wherein at least one diameter of the internal dimples of the first domain is the minimum dimple diameter, and none of the peripheral dimples of the first domain has a diameter which is the minimum dimple diameter. Golf ball.
[Technical Feature 14]
The technical feature 10 wherein at least one diameter of the peripheral dimples of the second domain is the minimum dimple diameter, and none of the internal dimples of the second domain has a diameter which is the minimum dimple diameter. Golf ball.
[Technical feature 15]
In a golf ball having an outer surface and having a plurality of dimples arranged on the outer surface.
The dimples are arranged in a plurality of replicas of the first domain and the second domain, and the first domain and the second domain do not have great circles and have four first domains. In a unified pattern with four of the second domains, they are joined together to cover the outer surface of the golf ball.
The dimple pattern inside the first domain is different from the dimple pattern inside the second domain.
The plurality of dimples have dimples having at least two different diameters including a maximum dimple diameter and a minimum dimple diameter.
The first domain consists of peripheral dimples and internal dimples, and none of the peripheral dimples of the first domain has a diameter that is the maximum dimple diameter or the minimum dimple diameter.
The second domain consists of peripheral dimples and internal dimples, the diameter of at least one of the peripheral dimples of the second domain is the maximum dimple diameter, and the diameter of at least one of the peripheral dimples of the second domain. Is a golf ball having the minimum dimple diameter described above.
[Technical features 16]
The technical feature that the first domain is three-fold rotationally symmetric around the center point of the first domain and the second domain is three-fold rotationally symmetric around the central point of the second domain. The golf ball according to 15.
[Technical feature 17]
The golf ball according to technical feature 15, wherein the plurality of dimples have at least three different diameter dimples.
[Technical Feature 18]
The golf ball according to technical feature 15, wherein the plurality of dimples have at least four different diameter dimples.
[Technical features 19]
The golf according to technical feature 15, wherein at least one diameter of the internal dimples of the first domain is the maximum dimple diameter, and at least one diameter of the internal dimples of the first domain is the minimum dimple diameter. ball.
[Technical feature 20]
The golf ball according to technical feature 15, wherein none of the internal dimples of the second domain has a diameter which is the minimum dimple diameter.
[Technical Features 21]
The golf ball according to technical feature 15, wherein the diameter of at least one of the internal dimples of the first domain is the minimum dimple diameter.

10 Golf Ball 12 Dimple 14 Domain 16 Face 18 Segment 20 Copy 22 Element

Claims (8)

In a golf ball having an outer surface and having a plurality of dimples arranged on the outer surface and a separation line corresponding to an interface between a pair of molds.
The dimples are arranged in a plurality of replicas of the first domain and the second domain, and the first domain and the second domain are four first domains and four second domains. In a unified pattern that has and does not include a great circle, it is joined so as to cover the outer surface of the golf ball.
The first domain and the second domain are curved segments in spherical geometry (a curved segment in spherical geometry is one in which a partial segment cut out from any two points on the curved segment is not a straight line in spherical geometry. The curved segment is a curved segment connecting the midpoints of the sides of a regular tetrahedron in spherical geometry, and the curved segment as a whole is a regular octahedron in spherical geometry on the outer surface. Forming four of the first domain and four second domains of curves corresponding to eight triangles, and four of the curve segments of the first domain or the second domain. Select the curve segment to configure the above separation line,
The dimple pattern inside the first domain is different from the dimple pattern inside the second domain.
The plurality of dimples have dimples having at least three different diameters including a maximum dimple diameter and a minimum dimple diameter.
The first domain consists of peripheral dimples and internal dimples, and the internal dimples of the first domain consist of at least three different diameter dimples.
The second domain consists of peripheral dimples and internal dimples, and the internal dimples of the second domain consist of two or less dimples of different diameters.
The diameter of at least one dimple inside the first domain is the minimum dimple diameter.
A golf ball characterized in that the diameter of at least one dimple inside the second domain is the minimum dimple diameter. The golf according to claim 1, wherein at least one diameter of the internal dimples of the first domain is the minimum dimple diameter, and none of the peripheral dimples of the first domain has a diameter which is the minimum dimple diameter. ball. The golf according to claim 1, wherein at least one diameter of the peripheral dimples of the second domain is the minimum dimple diameter, and none of the internal dimples of the second domain has a diameter which is the minimum dimple diameter. ball. In a golf ball having an outer surface and having a plurality of dimples arranged on the outer surface and a separation line corresponding to an interface between a pair of molds.
The dimples are arranged in a plurality of replicas of the first domain and the second domain, and the first domain and the second domain do not have great circles and have four first domains. In a unified pattern with four of the second domains and no great circle, they are spliced together to cover the outer surface of the golf ball.
The first domain and the second domain are curved segments in spherical geometry (a curved segment in spherical geometry is one in which a partial segment cut out from any two points on the curved segment is not a straight line in spherical geometry. The curved segment is a curved segment connecting the midpoints of the sides of a regular tetrahedron in spherical geometry, and the curved segment as a whole is a regular octahedron in spherical geometry on the outer surface. Forming four of the first domain and four second domains of curves corresponding to eight triangles, and four of the curve segments of the first domain or the second domain. Select the curve segment to configure the above separation line,
The dimple pattern inside the first domain is different from the dimple pattern inside the second domain.
The plurality of dimples have dimples having at least two different diameters including a maximum dimple diameter and a minimum dimple diameter.
The first domain consists of peripheral dimples and internal dimples, and none of the peripheral dimples of the first domain has a diameter that is the maximum dimple diameter or the minimum dimple diameter.
The second domain consists of peripheral dimples and internal dimples, the diameter of at least one of the peripheral dimples of the second domain is the maximum dimple diameter, and the diameter of at least one of the peripheral dimples of the second domain. Is a golf ball having the minimum dimple diameter described above. The golf ball according to claim 4, wherein at least one diameter of the internal dimples in the first domain is the maximum dimple diameter, and at least one diameter of the internal dimples in the first domain is the minimum dimple diameter. .. The golf ball according to claim 4, wherein none of the internal dimples of the second domain has a diameter that is the minimum dimple diameter. The golf ball according to claim 4, wherein the diameter of at least one of the internal dimples of the first domain is the minimum dimple diameter. The first domain is three times rotationally symmetric around the center point of the first domain, and the second domain is three times rotationally symmetric around the central point of the second domain. The golf ball according to any one of 7 to 7.

Images