JP5071951B2 - Golf ball - Google Patents

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Publication number
JP5071951B2
JP5071951B2 JP2001140834A JP2001140834A JP5071951B2 JP 5071951 B2 JP5071951 B2 JP 5071951B2 JP 2001140834 A JP2001140834 A JP 2001140834A JP 2001140834 A JP2001140834 A JP 2001140834A JP 5071951 B2 JP5071951 B2 JP 5071951B2
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Japan
Prior art keywords
spherical
golf ball
dimples
regular
dimple
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Expired - Fee Related
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JP2001140834A
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Japanese (ja)
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JP2002331044A (en
Inventor
隆弘 佐嶌
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ダンロップスポーツ株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a golf ball, and more particularly to a dimple pattern of a golf ball.
[0002]
[Prior art]
The golf ball has about 300 to 550 dimples on the surface thereof. The role of the dimples is to promote the turbulent transition of the boundary layer by disturbing the air flow around the golf ball when flying, thereby causing turbulent separation (hereinafter also referred to as “dimple effect”). . By promoting the turbulent transition, the separation point of the air from the golf ball is lowered backward, and the pressure resistance is reduced. Further, by promoting the turbulent transition, the difference between the peeling points on the upper side and the lower side of the golf ball due to backspin is promoted, and the lift acting on the golf ball is enhanced. By reducing the pressure resistance and improving the lift, the flight distance of the golf ball increases. A dimple pattern that easily promotes turbulent transition, that is, a dimple pattern that can better disturb the air flow, is superior in terms of aerodynamics.
[0003]
A polyhedron (in particular, a regular polyhedron or a quasi-regular polyhedron) is often used for dimple arrangement. When a polyhedron is used, a polyhedron inscribed in the virtual spherical surface is assumed, and the sides of the polyhedron are projected onto the virtual spherical surface by light rays radiated from the center of the sphere to the virtual spherical surface. And dimples are arranged. Examples of the regular polyhedron used include a regular hexahedron, a regular octahedron, a regular dodecahedron, and a regular icosahedron. Examples of the quasi-regular polyhedron used include a cubic octahedron and a dodecahedron.
[0004]
The surface of a regular polyhedron is composed of a single regular polygon, whereas the surface of a quasi-regular polyhedron is composed of two types of regular polygons. For this reason, the quasi-regular polyhedron is superior in design freedom of the dimple pattern than the regular polyhedron. To date, various dimple patterns using quasi-regular polyhedra have been proposed. For example, JP-A 63-186670, JP-A 1-221182 and JP-A 2-211181 disclose golf balls having a dimple pattern using a cubic octahedron. Japanese Patent Application Laid-Open Nos. 60-234673 and 62-79073 disclose golf balls having a dimple pattern using a dodecahedron.
[0005]
[Problems to be solved by the invention]
By the way, the most important performance required by golfers for golf balls is flight performance. As described above, since dimples influence flight performance, various ideas have been applied to the shape, volume, area, etc. of dimples for the purpose of improving flight performance. However, the golfer wants to further improve the flight distance.
[0006]
The present invention has been made in view of such problems, and an object thereof is to provide a golf ball having an improved dimple pattern and thus having excellent flight performance.
[0007]
[Means for Solving the Problems]
The invention made to achieve the above object is
The virtual spherical surface has a plurality of first spherical regular polygons and an area larger than that of the first spherical regular polygon by the dividing line formed by projecting the sides of the quasi-regular polyhedron inscribed in the virtual spherical surface onto the virtual spherical surface. A golf ball that is partitioned into a plurality of small second spherical regular polygons, each of which has dimples disposed on each first spherical regular polygon and each second spherical regular polygon,
The ratio of the total area of the dimples existing in these first spherical regular polygons to the total area of all first spherical regular polygons is defined as Y1 (%). When the ratio of the total area of dimples existing in these second spherical regular polygons is Y2 (%), the value of (Y1-Y2) is 8% or more and 20% or less. ball,
It is.
[0008]
In this golf ball, the value of (Y1-Y2) is as large as 8% or more and 20% or less. In other words, the dimples are dense in the first spherical regular polygon, and the dimples are sparse in the second spherical regular polygon, and the difference between the dimple densities is large. In this golf ball, areas where dimples are dense and sparse appear alternately due to backspin during flight. This promotes the dimple effect of disturbing the air flow and increases the flight distance of the golf ball.
[0009]
Preferably, the surface area occupation ratio Y of the dimple is 70% or more and 90% or less. As described above, the dimples are relatively sparse in the second spherical regular polygon, but even in this case, the reduction of the dimple effect as a whole golf ball is suppressed by setting the surface area occupation ratio Y within the above range. . As used herein, the term “surface area occupation ratio” means the ratio of the total dimple area to the surface area of the phantom spherical surface.
[0010]
Preferably, each dimple pattern of the plurality of first spherical regular polygons is substantially equivalent to each other. The plurality of second spherical regular polygonal dimple patterns are also substantially equivalent to each other. Thereby, the aerodynamic symmetry of the golf ball is maintained. Note that the term “equivalent” used in the present specification means that the dimple patterns to be compared are the same, line symmetric or rotationally symmetric.
[0011]
Preferably, the golf ball does not have a great circle other than the great circle formed by continuous lane markings and does not intersect the dimples at all. A great circle that does not intersect the dimple at all (hereinafter referred to as a “large circle”) is a belt-like region in which no dimple is present, and when this great circle matches the portion where the peripheral speed of backspin is the fastest, The dimple effect of the ball is difficult to appear. As described above, the dimples are sparse in the second spherical regular polygon, but even in this case, the dimple effect as a whole golf ball is suppressed by reducing the number of great circles.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.
[0013]
FIG. 1 is a front view showing a golf ball 1 according to an embodiment of the present invention, and FIG. 2 is a perspective view thereof. The diameter of the golf ball 1 is usually about 42.67 mm to 43.00 mm, particularly about 42.67 mm to 42.80 mm. The golf ball 1 has 456 dimples 2 on the surface. All the dimples 2 are circular dimples. That is, the shape of the dimple 2 viewed from the normal direction is a circle.
[0014]
In this golf ball 1, the dimples 2 are arranged using a cubic octahedron. That is, a cubic octahedron inscribed in the virtual spherical surface is assumed, and the virtual spherical surface is partitioned into 14 spherical regular polygons by 24 comparting lines on which 24 sides of the cubic octahedron are projected. A dimple 2 is arranged for each regular polygon. The spherical regular polygon consists of two types: a spherical square Ss that is a first spherical regular polygon and a spherical regular triangle St that is a second spherical regular polygon. The spherical square Ss has a larger area than the spherical regular triangle St. Specifically, the area of the spherical square Ss is about 2.5 times the area of the spherical regular triangle St. In FIG. 1, the spherical square Ss is located in front, and in FIG. 2, the spherical regular triangle St is located in front. The term “virtual spherical surface” used in the present specification means the surface of the golf ball 1 when it is assumed that the dimple 2 does not exist.
[0015]
The four divisional circles L1 to L4 are formed by the continuous six division lines. In FIG. 2, the divided great circle L4 matches the contour of the golf ball 1. In the actual golf ball 1, the lane markings and the zoning circles (L1 to L4) are not recognized as edges, but for the sake of convenience of description, in FIG. 1 and FIG. The divided great circles (L1 to L4) do not intersect the dimple 2. In other words, the divided great circles (L1 to L4) are great circles.
[0016]
This golf ball 1 has six spherical squares Ss and eight spherical regular triangles St. The dimple patterns of all the spherical squares Ss are substantially the same. The dimple patterns of all spherical regular triangles St are substantially the same. In the substantially identical state, not only when the dimple patterns to be compared with each other are completely the same, but also when the two differ slightly due to manufacturing errors, or when the golf ball 1 is formed (core holding pin, vent pin, injection) The case where the both are intentionally made slightly different depending on the convenience of forming gates, parting lines, etc. is also included.
[0017]
Since the dimple patterns of all the spherical squares Ss are substantially the same and the dimple patterns of all the spherical regular triangles St are substantially the same, the aerodynamic symmetry of the golf ball 1 is maintained. The aerodynamic symmetry of the golf ball 1 is also maintained when the dimple patterns of all the spherical squares Ss are substantially equivalent to each other and the dimple patterns of all the spherical regular triangles St are substantially equivalent to each other.
[0018]
As shown in FIG. 1, the spherical square Ss includes a B dimples A dimple, the diameter of the area at 3.78mm is 11.22Mm 2 is area 14.19Mm 2 a diameter of 4.25 mm, D dimples having a diameter of 3.00 mm and an area of 7.07 mm 2 are formed. In FIG. 1, the types (A, B, and D) of the dimples 2 are shown only in one unit (spherical right triangle) obtained by dividing one spherical square Ss into eight equal parts.
[0019]
One spherical square Ss includes four A dimples, 32 B dimples, and 12 D dimples. Since the golf ball 1 has six spherical squares Ss as described above, there are 24 A dimples, 192 B dimples, and 72 D dimples in the entire spherical square Ss. . The total area of these dimples 2 is 3003.84 mm 2 . When the diameter of the phantom sphere is 42.70 mm, the total area of the six spherical squares Ss is 3717.49 mm 2, so the total area of the dimples 2 existing in these spherical squares Ss occupying the total area of all the spherical squares Ss. The ratio Y1 is 80.8%.
[0020]
As shown in FIG. 2, the spherical regular triangle St includes a C dimple having a diameter of 3.58 mm and an area of 10.07 mm 2 , a D dimple having a diameter of 3.00 mm and an area of 7.07 mm 2 , and Is formed. In FIG. 2, the types (C and D) of the dimples 2 are shown only in one unit (spherical right triangle) obtained by dividing one spherical regular triangle St into six equal parts.
[0021]
One spherical regular triangle St includes nine C dimples and twelve D dimples. As described above, since the golf ball 1 includes the eight spherical regular triangles St, the entire spherical regular triangle St includes 72 C dimples and 96 D dimples. The total area of these dimples 2 is 140.76 mm 2 . Since the total area of the eight spherical regular triangles St when the diameter of the phantom sphere is 42.70 mm is 2011.54 mm 2 , the dimples 2 existing in these spherical regular triangles St occupying the total area of all the spherical regular triangles St. The ratio Y2 of the total area is 69.8%.
[0022]
Thus, the ratio Y1 in the spherical square Ss is 80.8%, and the ratio Y2 in the spherical regular triangle St is 69.8%. Therefore, the value of (Y1-Y2) is 11.0%. In this golf ball 1, the dimples 2 are densely arranged on the spherical square Ss, and the dimples 2 are sparsely arranged on the spherical regular triangle St. When the golf ball 1 is hit, the golf ball 1 flies with backspin. Due to this backspin, regions where the dimples 2 are dense (spherical square Ss) and regions where the dimples 2 are sparse (spherical regular triangle St) appear alternately. Thereby, the air flow around the golf ball 1 is better disturbed, and the flight performance of the golf ball 1 is enhanced.
[0023]
The value of (Y1-Y2) is set to 8% or more and 20% or less. When the value of (Y1-Y2) is less than 8%, the air flow is hardly disturbed. In this respect, the value of (Y1-Y2) is more preferably 9% or more, further preferably 10% or more, and particularly preferably 11% or more. When the value of (Y1-Y2) exceeds 20%, an area in which the dimples 2 are extremely sparse is generated, and the flight performance of the golf ball 1 as a whole may deteriorate. In this respect, the value of (Y1-Y2) is more preferably 16% or less, and particularly preferably 15% or less.
[0024]
Even when the dimple 2 of the spherical square Ss is sparse and the dimple 2 of the spherical regular triangle St is dense, the air flow is disturbed to some extent, but the spherical ball Ss having a large area is sparse so that the golf ball As a whole, the dimples 2 are sparse and the flight performance of the golf ball 1 is deteriorated. For these reasons, in the golf ball 1 of the present invention, the spherical square Ss having a large area is dense, and the spherical regular triangle St having a small area is sparse.
[0025]
The total dimple area (total dimple area) of the golf ball 1 shown in FIGS. 1 and 2 is 4407.60 mm 2 . On the other hand, the surface area of the phantom spherical surface having a diameter of 42.70 mm is 5728.03 mm 2 . Therefore, in this golf ball 1, the surface area occupation ratio Y is 76.9%.
[0026]
The surface area occupation ratio Y is preferably 70% or more and 90% or less. If the surface area occupation ratio Y is less than 70%, the dimples 2 may become sparse as a whole of the golf ball 1 and the flight performance of the golf ball 1 may be insufficient. In this respect, the surface area occupation ratio Y is more preferably equal to or greater than 75%. If the surface area occupation ratio Y exceeds 90%, it becomes difficult to make the dimples 2 of the spherical regular triangle St sparse. In this respect, the surface area occupation ratio Y is more preferably equal to or less than 87%, and particularly preferably equal to or less than 85%.
[0027]
As described above, the block great circles (L1 to L4) are great circles, but the golf ball 1 has no great circles other than the block great circles (L1 to L4). That is, in this golf ball 1, the number of great circles is only four. Therefore, even if the dimples 2 of the spherical regular triangle St are sparsely arranged, the dimple effect as a whole of the golf ball 1 is sufficiently exhibited. The dimples 2 may be arranged so that the divided great circles (L1 to L4) intersect with the dimples 2. In this case, the number of great circle bands is further reduced, and the flight distance of the golf ball 1 is increased. Ideally, the number of great circles is zero, but the great circles may be formed only in the portion corresponding to the parting line of the golf ball molding die. In this case, the number of great circles is one.
[0028]
When the dimple 2 intersects any of the divided great circles (L1 to L4), the dimple 2 exists across two or more spherical regular polygons. In this case, only the area of the region inside the divided great circle (L1 to L4) in the dimple 2 is added to the total area of the dimples 2 existing in the spherical regular polygon, and the ratios Y1 and Y2 are calculated. The
[0029]
The size of the dimple 2 formed on the golf ball 1 of the present invention is not particularly limited, but the diameter is usually 1.5 mm or more and 5.5 mm or less, particularly 2.5 mm or more and 4.5 mm or less. The depth of the dimple 2 (the distance between the plane including the outer edge of the dimple 2 and the deepest portion of the dimple 2) is usually 0.10 mm or more and 0.25 mm or less, and particularly 0.12 mm or more and 0.20 mm or less. . The total sum of the dimple volumes (the volume of the space surrounded by the plane including the outer edge of the dimple 2 and the surface of the dimple 2) is usually 250 mm 3 or more and 370 mm 3 or less, particularly 270 mm 3 or more and 340 mm 3 or less. In addition to or instead of the circular dimple 2, non-circular dimples having a planar shape such as a polygon or an ellipse may be formed.
[0030]
In this golf ball 1, a cubic octahedron that is a quasi-regular polyhedron is used and the dimples 2 are arranged. However, other quasi-regular polyhedrons may be used. In this case, a icosahedron inscribed in the phantom sphere is assumed, and the phantom sphere has 32 spherical regular polymorphs by 60 comparting lines on which 60 sides of the icosahedron are projected. Divided into squares, dimples are arranged for each spherical regular polygon. The spherical regular polygon consists of two types: a spherical regular pentagon that is a first spherical regular polygon and a spherical regular triangle that is a second spherical regular polygon. The spherical regular pentagon has a larger area than the spherical regular triangle. Six divisional circles are formed by the continuous ten division lines.
[0031]
When the twelve icosahedron is used, the golf ball has 12 spherical regular pentagons and 20 spherical regular triangles. All spherical regular pentagon dimple patterns are substantially equivalent to each other, and all spherical regular triangle dimple patterns are substantially equivalent to each other, so that the aerodynamic symmetry of the golf ball is maintained.
[0032]
Even in the case where a twelve icosahedron is used, the ratio Y1 of the total area of dimples existing in these spherical regular pentagons to the total area of all spherical regular pentagons, and these total occupied areas of all spherical regular triangles. The difference (Y1−Y2) from the total area ratio Y2 of dimples existing in the spherical regular triangle is 8% or more and 20% or less. In this golf ball, dimples are densely arranged in a spherical regular pentagon, and dimples are sparsely arranged in a spherical regular triangle. When this golf ball is struck, backspin causes alternating dimple regions (spherical regular pentagons) and sparse regions (spherical regular triangles). As a result, the air flow around the golf ball is better disturbed and the flight performance of the golf ball is enhanced.
[0033]
Even in a golf ball using a twelfth and icosahedron, the surface area occupation ratio Y is preferably 70% or more and 90% or less. Further, it is preferable that there is no great circle zone other than the six divisional great circles, and it is particularly preferred that the great circle zone is zero or one when the division great circle intersects the dimples.
[0034]
【Example】
Hereinafter, the effects of the present invention will be clarified based on examples, but it is needless to say that the present invention should not be interpreted in a limited manner based on the description of the examples.
[0035]
[Example]
An ionomer resin composition was injection molded around a core layer made of solid rubber to form a cover layer, thereby obtaining a golf ball of an example having the dimple pattern shown in FIGS. The outer diameter of the ball was 42.70 mm ± 0.03 mm, the compression was 85 ± 2, and the total dimple volume was about 320 mm 3 .
[0036]
[Comparative example]
A golf ball of a comparative example having a dimple pattern having a front view of FIG. 3 and a perspective view of FIG. 4 was obtained in the same manner as in the example except that the molding die was changed. This dimple pattern is also a cubic octahedron pattern similar to the embodiment, and has four great circle bands. Details of the dimple pattern are shown in Table 1 below.
[0037]
[Flying distance]
Twenty golf balls of each of the examples and comparative examples were prepared. On the other hand, a machine head driver (W1) is attached to a swing machine manufactured by Tsurutemper, so that the head speed is about 49 m / s, the launch angle is about 11 °, and the spin speed of the backspin is about 3000 rpm. Adjusted. Each golf ball was hit and the flight distance (distance from the launch point to the rest point) was measured. The average value of the measurement results is shown in Table 1 below. The wind during the test was almost a tailwind and the average wind speed was about 1 m / s.
[0038]
[Table 1]
[0039]
As shown in Table 1, the golf ball of the example has a greater flight distance than the golf ball of the comparative example. From this evaluation result, the superiority of the present invention is clear.
[0040]
【Effect of the invention】
As described above, the golf ball of the present invention has excellent flight performance. This golf ball can meet a golfer's demand for a flight distance.
[Brief description of the drawings]
FIG. 1 is a front view showing a golf ball according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the golf ball of FIG. 1;
FIG. 3 is a front view showing a golf ball of a comparative example of the present invention.
FIG. 4 is a perspective view showing the golf ball of FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Golf ball 2 ... Dimple Ss ... Spherical square St ... Spherical regular triangle L1, L2, L3, L4 ... Compartment great circle A ... A dimple B ... B dimple C ... C dimple D ... D dimple

Claims (3)

  1. The virtual spherical surface has a plurality of first spherical regular polygons and an area larger than that of the first spherical regular polygon by the dividing line formed by projecting the sides of the quasi-regular polyhedron inscribed in the virtual spherical surface onto the virtual spherical surface. A golf ball that is divided into a plurality of small second spherical regular polygons, dimples are arranged approximately equivalently to all the first spherical regular polygons, and dimples are arranged approximately equivalently to all the second spherical regular polygons. Because
    The ratio of the total area of the dimples existing in these first spherical regular polygons to the total area of all first spherical regular polygons is defined as Y1 (%). when occupying ratio of the total area of the dimples present in these second spherical regular polygon is a Y2 (%), Ri der value than 20% more than 8% of the (Y1-Y2),
    The quasi-regular polyhedron is a cuboctahedron, the first spherical regular polygon is a spherical square, a golf ball in which the second spherical regular polygon and said spherical regular triangle der Rukoto.
  2.   2. The golf ball according to claim 1, wherein a surface area occupation ratio Y, which is a ratio of a total area of dimples to a surface area of the phantom spherical surface, is 70% or more and 90% or less.
  3.   3. The golf ball according to claim 1, wherein there is no great circle other than the great circle formed by the continuous lane markings and does not intersect the dimples at all.
JP2001140834A 2001-05-11 2001-05-11 Golf ball Expired - Fee Related JP5071951B2 (en)

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JP5961348B2 (en) 2011-04-19 2016-08-02 ダンロップスポーツ株式会社 Golf ball
JP2016055192A (en) * 2015-12-18 2016-04-21 ダンロップスポーツ株式会社 Golf ball
JP6242023B2 (en) * 2015-12-18 2017-12-06 ダンロップスポーツ株式会社 Golf ball

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JPH0573426B2 (en) * 1985-09-30 1993-10-14 Sumitomo Rubber Ind
US4960281A (en) * 1989-10-17 1990-10-02 Acushnet Company Golf ball
KR940008444B1 (en) * 1992-04-21 1994-09-15 윤양중 Golf ball
JPH08191905A (en) * 1995-01-13 1996-07-30 Sumitomo Rubber Ind Ltd Golf ball
JP2904718B2 (en) * 1995-03-24 1999-06-14 株式会社倉本産業 Golf ball
JPH0975477A (en) * 1995-09-14 1997-03-25 Sumitomo Rubber Ind Ltd Solid golf ball
JP3897065B2 (en) * 1996-02-26 2007-03-22 ブリヂストンスポーツ株式会社 Golf ball

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