US20120302377A1 - Golf Ball with Non-Circular Dimples Having Circular Arc-Shaped Outer Peripheral Edges - Google Patents

Golf Ball with Non-Circular Dimples Having Circular Arc-Shaped Outer Peripheral Edges Download PDF

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Publication number
US20120302377A1
US20120302377A1 US13/376,982 US201013376982A US2012302377A1 US 20120302377 A1 US20120302377 A1 US 20120302377A1 US 201013376982 A US201013376982 A US 201013376982A US 2012302377 A1 US2012302377 A1 US 2012302377A1
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United States
Prior art keywords
dimples
circular
golf ball
polyhedron
sphere
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Abandoned
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US13/376,982
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English (en)
Inventor
Tomohiko Sato
Sunao Umemura
Yutaka Kawata
Mitsuhiro Saso
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Individual
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0004—Surface depressions or protrusions
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0004—Surface depressions or protrusions
    • A63B37/0007—Non-circular dimples
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0004—Surface depressions or protrusions
    • A63B37/0007—Non-circular dimples
    • A63B37/0008—Elliptical
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0004—Surface depressions or protrusions
    • A63B37/0012—Dimple profile, i.e. cross-sectional view
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0004—Surface depressions or protrusions
    • A63B37/0019—Specified dimple depth
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/0004—Surface depressions or protrusions
    • A63B37/002—Specified dimple diameter

Definitions

  • the present invention relates to a golf ball with non-circular dimples which improve the aerodynamic properties of the golf ball.
  • dimples are essential in any event in order to increase the lift-drag ratio (lift/drag), which means that prescribed flat surfaces or ridge portions are necessary between adjacent dimples.
  • Patent Document 1 U.S. Pat. No. 4,830,378 Specification
  • Patent Document 2 Japanese Unexamined Patent Application Publication H06-190082
  • Patent Document 3 Japanese Unexamined Patent Application Publication 2005-185341
  • the inventors arrived at the recognition that the matter of how to reduce air resistance during flight in the air while simultaneously improving the straightness of the trajectory of the ball is vital to the improvement of golf balls under the present circumstances in which, although the initial velocity of a ball is greatly affected by the coefficient of restitution of the ball, there are specific restrictions to the initial velocity of the ball.
  • the first objective of the present invention is to provide a golf ball designed to be capable of increasing the lift-drag ratio (lift/drag) even if the amount of spin increases.
  • the second objective is to provide a golf ball with excellent straightness of trajectory even if the striking surface of the club does not align squarely with the golf ball when struck.
  • a golf ball which flies while rotating has a separation boundary in the vicinity of its maximum diameter, and drag is generated by the effect of vortices generated at the back of the golf ball from the separation boundary, so the ball is greatly affected by the separation width, which is the vertical width of the separation boundary.
  • the conventional way of thinking is to move the separation positions of these vortices to the back by forming circular dimples and to reduce the separation width and thus the drag in an attempt to achieve lift by the airflow speed difference above and below the golf ball due to the dimples, and the view that the formation of circular dimples is essential has been dominant.
  • the generation of vortices in the dimples cannot be avoided between a golf ball which flies while rotating and the peripheral air, when circular dimples are not formed (the present inventors formed a golf ball as a regular triangular polyhedron and formed grooves in the polyhedron ridge lines), the decrease in drag is substantial but sufficient lift cannot be achieved, and as a result, the flight distance required for a golf ball cannot be achieved.
  • the present invention which was conceived based on new aerodynamic knowledge of the golf ball described above, is a golf ball having non-circular dimples in which the surface of a sphere is used to forma land part and a plurality of dimples are formed on the land part, wherein some or all of the plurality of dimples are non-spherical dimples surrounded by peripheral edges formed by a pair of circular arcs having the same or different curvatures extending on both sides of the ridge lines connecting the vertices of polygons inscribed in the sphere, and the major axis along the ridge lines of the inscribed polyhedron with non-circular dimples is at least 1.2 times greater than the minor axis orthogonal to the ridge lines.
  • the vortices formed at the peripheral edge parts of the dimples are formed with a time difference, in contrast to circular dimples, so that the vortices that are generated flow along the peripheral edges of the non-circular dimples, and as a result, even if the amount of spin increases while the ball undergoes the lift due to the dimples, the separation width formed on the ball and thus the drag is reduced, as shown in FIG. 4(B) , which leads to the improvement of the flight distance even at the same velocity (same coefficient of restitution).
  • This phenomenon generates vertical vortices , and the flow of the vertical vortices of this ball in which the peripheral edges of the dimples are formed by circular arcs is not constant with respect to the traveling direction of the ball, in contrast to the case of circular dimples (with circular dimples, the direction of contact between the peripheral edges and air is always constant), so the vertical vortices generated at the peripheral edges do not stop at the peripheral edges of the dimples but rather flow along the peripheral edges.
  • the present invention is functionally based on the fact that such a phenomenon occurs. Taking into consideration the symmetry of the ball, it is preferable for the peripheral edges of the dimples to be formed into elliptical shapes formed by a pair of circular arcs having the same curvature.
  • non-circular dimples surrounded by peripheral edges formed by a pair of circular arcs having the same or different curvatures extending along both sides of the entire ridge lines connecting the vertices of a polyhedron inscribed in a sphere are formed on the surface of the sphere (including pseudospheres composed of polyhedrons which are substantially similar to spheres).
  • a major axis DL axis along the ridge lines of the non-circular dimples
  • each dimple consists of a pair of circular arcs 2 a and 2 b to form an elliptical shape if the curvatures of the circular arcs 2 a and 2 b are the same or a pseudo-elliptical shape if the curvatures of the circular arcs 2 a and 2 b are different.
  • the depth of the non-circular dimples must be a depth required to generate turbulence when receiving the airflow of the periphery of the ball, as in the case of circular dimples, and the depth is ordinarily formed within a range of 0.2 to 0.5 mm.
  • the dimples of the present invention are preferably formed evenly over the entire surface of the ball, and assuming a triangular, pentagonal, or hexagonal polyhedron inscribed in the sphere, it is preferable to form the non-circular dimples so that the major axis of each dimple is positioned on each ridge line of the segmented face.
  • a triangular polyhedron a regular icosahedron shown in FIG. 5( a ) is used as a base, and when each triangle is divided into two levels vertically and then split into four parts, as shown in FIG. 6( a ), an 80-sided polyhedron is formed. When the triangle is divided into three levels and then split into nine parts, as shown in FIG.
  • a 180-sided polyhedron is formed.
  • the triangle is divided into four levels and split into 16 parts, as shown in FIG. 6 ( c ).
  • a 320-sided polyhedron is formed.
  • 120 dimples are formed in the case of an 80-sided polyhedron
  • 270 dimples are formed in the case of a 180-sided polyhedron
  • 480 dimples are formed in the case of a 320-sided polyhedron.
  • the area occupied by the land part on each face changes depending on the minor axis diameter Ds of the dimples that are formed, but in order to improve the lift by adjusting the area occupied by the land part surrounded by the dimples in the case of a 80-sided polyhedron, in particular, it may be preferable to form at least one circular or polygonal dimple 3 on the land part surrounded by the non-circular dimples 2 of each face, as shown in FIG. 9 .
  • the non-circular dimples described above may be formed along the ridge lines of each face, but taking the case of pentagons as an example, a regular dodecahedron is used as a base, as shown in FIG. 7 ( a ), and triangles are formed by line segments extending from the vertices of each pentagon face in the expanded view to the center of that face ( FIG. 7 ( b )), which makes it possible to manufacture a golf ball by forming non-circular dimples extending along the ridge lines of each triangle, as shown in FIG. 8 .
  • the golf ball may be manufactured by forming circular or polygonal dimples 4 at the vertices of the polyhedron inscribed in the sphere.
  • a polygonal polyhedron inscribed in a sphere is used as a foundation, and an inscribed polyhedron formed by further dividing each ridge line connecting the vertices or each face with triangles is presumed, wherein non-circular dimples surrounded by a pair of circular arcs are formed on the ridge lines connecting the vertices and used in place of conventional circular dimples.
  • the area occupied by the land part (spherical surface) of the non-circular dimples is small, and if the lift is insufficient, the lift can be improved by forming circular or polygonal dimples on the remaining land part.
  • the dimples on the ball surface are configured as non-circular dimples surrounded by a pair of circular arcs, so the vortices formed at the peripheral edges of the dimples are formed with a time difference and, as a result, flow along the elliptical peripheral edges so that they do not become stagnant. Accordingly, the drag is not increased even if the spin increases in comparison to a golf ball on which circular dimples are formed, and the flight distance improves as a result. Moreover, the straightness of trajectory is excellent since the air resistance, which causes the ball to hook or slice, is never increased.
  • FIG. 1 An oblique view showing the entire golf ball of a first embodiment of the present invention.
  • FIG. 2 An oblique view of a second embodiment.
  • FIG. 3 An oblique view of a third embodiment.
  • FIG. 4 A conceptual diagram of a situation (A) resulting at the separation boundary of a golf ball with circular dimples and a situation (B) resulting at the separation boundary of the golf ball with circular dimples according to the present invention.
  • FIG. 5 A cubic diagram ( a ) and an expanded view ( b ) of a regular icosahedron.
  • FIG. 6 An explanatory view showing aspects in which each triangle of the icosahedron shown in FIG. 5 is divided into 4 parts ( a ), 9 parts ( b ), or 16 parts ( c ).
  • FIG. 7 A cubic diagram ( a ) and an expanded view ( b ) of a regular icosahedron, and the expanded view shows an example in which a regular pentagon is divided.
  • FIG. 8 An explanatory view showing a method of forming dimples with pairs of circular arcs when each face of the polyhedron has a triangular shape.
  • FIG. 9 An explanatory view of a case in which circular dimples are distributed over a land part surrounded by non-circular dimples.
  • FIG. 10 An explanatory view of a case in which circular dimples are distributed over a land part containing vertices when the non-circular dimples do not cover the entire lengths of the ridge lines of the inscribed polyhedron.
  • FIG. 11 A schematic diagram of the second embodiment.
  • FIG. 12 A cross-sectional view along line A-A in FIG. 11 .
  • FIG. 13 A cross-sectional view along line B-B in FIG. 11 .
  • FIG. 1 shows a golf ball according to an embodiment of the present invention.
  • 1 is a golf ball forming a sphere, wherein elliptical dimples 2 with a major axis (axis parallel to the ridge lines) 3.7 times as long as the minor axis (axis orthogonal to the ridge lines) are formed along the ridge lines connecting the vertices of a 180-sided triangular polyhedron inscribed in the sphere, and the dimple depth is 0.3 mm.
  • FIG. 2 is a golf ball 11 forming a sphere, wherein a major axis 1.9 times as long as the minor axis is formed along the ridge lines connecting the vertices of a 180-sided triangular polyhedron inscribed in a sphere, and elliptical dimples 12 with a depth of 0.3 mm are formed.
  • FIG. 11 is a schematic line diagram of FIG. 2 .
  • FIG. 12 is an exploded cross-sectional view along line A-A in FIG. 11
  • FIG. 13 is an exploded cross-sectional view along line B-B in FIG. 11 .
  • FIG. 3 is a golf ball 21 forming a sphere, wherein a major axis 4.0 times as long as the minor axis is formed along the ridge lines formed by an imaginary 320-sided triangular polyhedron so as to form elliptical dimples 22 with a depth of 0.3 mm.
  • elliptical dimples may also be formed on each ridge line of a triangular, pentagonal, or hexagonal polyhedron.
  • elliptical dimples were formed on the ridge lines of 180- and 320-sided triangular polyhedrons inscribed in a sphere, but non-circular dimples may also be formed on the ridge lines of an 80-sided triangular polyhedron.
  • the gist of the present invention is that the peripheral edges of the dimples are formed as elliptical or non-circular shapes surrounded by pairs of circular arcs, and turbulence is generated at the peripheral edges with a time difference so that the vortices that are formed flow along the peripheral edges consisting of circular arcs.
  • the present invention relates to the cover shape of a golf ball, so it goes without saying that the golf ball may be applied to the internal structures of golf balls such as a 4-piece structure in addition to 2-piece and 3-piece structures.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
US13/376,982 2009-06-09 2010-06-09 Golf Ball with Non-Circular Dimples Having Circular Arc-Shaped Outer Peripheral Edges Abandoned US20120302377A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2009138110 2009-06-09
FR2009-138110 2009-06-09
PCT/JP2010/059762 WO2010143655A1 (ja) 2009-06-09 2010-06-09 周縁が円弧である非円形ディンプルゴルフボール

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US (1) US20120302377A1 (ja)
JP (2) JP3157248U (ja)
KR (1) KR101550792B1 (ja)
CN (1) CN102458588A (ja)
WO (1) WO2010143655A1 (ja)

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Publication number Priority date Publication date Assignee Title
JPWO2013111263A1 (ja) * 2012-01-23 2015-05-11 佳弘 岸下 ゴルフボール
US9440116B1 (en) 2015-04-30 2016-09-13 Volvik Inc. Golf ball having surface divided by triangular concave sectors
US9662541B2 (en) 2015-04-14 2017-05-30 Volvik, Inc. Golf ball having discontinuous annular dimples
US9744405B2 (en) 2015-03-19 2017-08-29 Volvik Inc. Golf ball having comma-shaped dimples
US9776044B2 (en) 2015-03-19 2017-10-03 Volvik, Inc. Golf ball having comma-shaped dimples
US9873019B2 (en) 2015-04-30 2018-01-23 Volvik Inc. Golf ball having surface divided by triangular concave sectors
US20180264326A1 (en) * 2017-03-14 2018-09-20 Wilson Sporting Goods Co. Tennis ball having a core with aerodynamic patterns
US10821326B2 (en) 2018-08-13 2020-11-03 Volvik Inc. Golf ball
USD976349S1 (en) * 2020-06-09 2023-01-24 Bownce Holding Plc Ball for sports
US11602674B2 (en) * 2020-06-30 2023-03-14 Volvik Inc. Golf ball having a spherical surface in which a plurality of combination dimples are formed

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JP3157248U (ja) * 2009-06-09 2010-02-04 友彦 佐藤 楕円形ディンプルゴルフボール
JP5988418B2 (ja) * 2010-12-15 2016-09-07 株式会社Ｈａｎａｂｉ 非円形ディンプルゴルフボール
JP2013138788A (ja) * 2012-01-05 2013-07-18 Sunao Umemura ディンプル底部が隆起したゴルフボール
US20150057106A1 (en) 2012-01-23 2015-02-26 Yoshihiro Kishishita Golf Ball
US20150300434A1 (en) * 2014-04-18 2015-10-22 GM Global Technology Operations LLC Airflow deflector for brake cooling
USD831135S1 (en) * 2015-12-31 2018-10-16 Eye On Ball, Inc. Sports ball

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US8430768B2 (en) * 2008-07-03 2013-04-30 Bridgestone Sports Co., Ltd. Color golf ball

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2013111263A1 (ja) * 2012-01-23 2015-05-11 佳弘 岸下 ゴルフボール
US9744405B2 (en) 2015-03-19 2017-08-29 Volvik Inc. Golf ball having comma-shaped dimples
US9776044B2 (en) 2015-03-19 2017-10-03 Volvik, Inc. Golf ball having comma-shaped dimples
US9662541B2 (en) 2015-04-14 2017-05-30 Volvik, Inc. Golf ball having discontinuous annular dimples
US9440116B1 (en) 2015-04-30 2016-09-13 Volvik Inc. Golf ball having surface divided by triangular concave sectors
US9873019B2 (en) 2015-04-30 2018-01-23 Volvik Inc. Golf ball having surface divided by triangular concave sectors
US20180264326A1 (en) * 2017-03-14 2018-09-20 Wilson Sporting Goods Co. Tennis ball having a core with aerodynamic patterns
US10549159B2 (en) * 2017-03-14 2020-02-04 Wilson Sporting Goods Co. Tennis ball having a core with aerodynamic patterns
US10821326B2 (en) 2018-08-13 2020-11-03 Volvik Inc. Golf ball
USD976349S1 (en) * 2020-06-09 2023-01-24 Bownce Holding Plc Ball for sports
US11602674B2 (en) * 2020-06-30 2023-03-14 Volvik Inc. Golf ball having a spherical surface in which a plurality of combination dimples are formed

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Publication number Publication date
CN102458588A (zh) 2012-05-16
KR20120043728A (ko) 2012-05-04
KR101550792B1 (ko) 2015-09-07
WO2010143655A1 (ja) 2010-12-16
JPWO2010143655A1 (ja) 2012-11-29
JP5715948B2 (ja) 2015-05-13
JP3157248U (ja) 2010-02-04

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