JPH11104268A - Golf ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the tendency to the slicing and hooking of a tee shot with golf play by changing the dimple patterns on a ball surface while a golfer is often troubled with such slicing and hooking. SOLUTION: The ball which is increased in the inertia mass to the specific axis 3 of rotation passing the center of the golf ball 1 rotates always around the same axis 3 of rotation in flying. The dimple patterns are improved to offset the effect of the dimples 8 on the rotation in a horizontal direction by utilizing such characteristic, by which the slicing and hooking are lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION

TECHNICAL FIELD The structure of a golf ball.

[0001]

2. Description of the Related Art Various depressions, that is, dimple patterns are provided on the surface of a golf ball for the purpose of applying a lift to a golf ball flying while rotating to increase the flight distance. Since the golf ball cannot predict which direction it will rotate during flight, this dimple pattern is applied to the entire surface in a uniform design. This results in the effect of bending the trajectory of the ball left and right when horizontal rotation is applied to the ball, which promotes the tendency of so-called slicing and hooking.

[0002]

SUMMARY OF THE INVENTION In a golf ball having an increased inertial mass around a specific rotation axis, the rotation axis during flight coincides with the axis that maximizes the inertial mass of the ball. If the plane is orthogonal and substantially symmetrical with respect to a plane passing through the center point, it is not always necessary to make the entire surface of the dimple pattern uniform. By utilizing this feature and devising a dimple pattern, it is possible to design a ball that can reduce slices and hooks.

[0003]

SUMMARY OF THE INVENTION In a golf ball having an increased inertial mass around a specific rotation axis, the rotation axis of the ball coincides with the maximum inertial mass rotation axis in an initial stage of flight. That is,
Always rotate around a particular axis. Therefore, the dimples for enhancing the lift of the ball have a certain effect even if they are not necessarily uniform over the entire surface. Assuming that the ball is accurately hit and the ball is rotating around the horizontal axis, the dimple is effective enough if it is provided mainly on its vertical surface, so it is provided on the so-called flank close to the rotation axis There is not much effect. However, providing dimples uniformly on the entire surface means that dimples are also provided on the side surface that does not significantly contribute to lift, and as described later, dimples on this side portion are sliced when the rotation axis is inclined. This will promote the horizontal bending force that causes hooks and hooks. Therefore, by arranging the dimples preferentially in a portion near the maximum inertial mass plane, it is possible to design a ball which is difficult to slice or hook and has an appropriate levitation force.

[0004]

FIG. 1 is a schematic view of a golf ball flying forward as viewed from behind. A golf ball 1 has an increased inertial mass with respect to a specific axis.
2 is a vertical axis, 3 is a rotation axis of the hit ball, and a horizontal line 4
45 degrees. It is assumed that the ball is flying clockwise as viewed from above and clockwise as viewed from the left, that is, flying forward while performing slice rotation. 5 is orthogonal to the rotation axis 3 in the plane of the maximum inertial mass. Dimples are provided on the surface of the ball between the left and right lines 6 and 7 of the surface 5, but the other surfaces are smooth and the aerodynamic effect is suppressed. 10 Lift distribution indicates the distribution of lift generated on the surface having dimples. The resultant force is 13, the vertical component is 15, and the horizontal component is 14.
11 and 12 are distributions of lift generated in two portions having the same arc length that is inclined 45 degrees from the rotation axis 3 and is vertical and horizontal with respect to the ball, respectively. Represents. No vertical force is generated from the lift distribution 11, and no horizontal component is generated from the lift distribution 12.
16 and 18 are the horizontal and vertical component forces when it is assumed that dimples are present on the entire surface of the ball, and 17 and 19 are the horizontal and vertical component forces when no dimple is applied to this portion. The horizontal component 17, which is a force for moving the ball to the right, has a small aerodynamic effect, and is therefore smaller than the horizontal component 16.

[0005] This simplified example will be described. 5mm left and right from the center point of the golf ball 2
Assume two parallel planes 6 and 7. The portion sandwiched between these two planes is provided with a dimple pattern having a large lift effect as in the conventional art. Other surfaces should be smooth to minimize aerodynamic effects. It is assumed that the ball is hit with a slicing tendency, and that the rotation axis of the hit ball is inclined by 45 degrees with the horizontal line when the ball is viewed from the rear. When the ball flies forward, the rotation axis 3 in FIG.
The relative speed between the ball and the space decreases on the upper right circumferential circle, and increases on the opposite side. Therefore, a lift is generated in the upper right direction, including the effect of dimples. Now, it is assumed that the dimples are uniformly arranged on the entire surface. For the sake of simplicity, let us consider the representative ball portion described above. The components 15 and 18 generated in the vertical direction have no force to bend the ball. Therefore, the horizontal component force generated at that time is schematically represented by the horizontal component force 14 + the horizontal component force 16
It is represented by On the other hand, when the dimple is applied only between the lines 6 and 7, the aforementioned horizontal component 16 shows a smaller value of the horizontal component 17 because there is no dimple,
Since the vertical component 19 at that time does not have to be considered because it does not have a force to bend the ball, the total horizontal component is a smaller value than the horizontal component 14 + horizontal component 17, 14 + 16. By devising the arrangement of the dimples in this manner, the tendency of slicing can be suppressed. If the range where the normal dimple is applied is made too small, the slice can be reduced, but at the same time, the lift of the ball is also lost, which leads to a reduction in the flight distance. Therefore, it goes without saying that the design of the dimple has an appropriate range depending on the nature of the target ball.

【Example】

[0006]

According to the present invention, a ball having an increased inertial mass around a specific axis of rotation has a feature that the axis of rotation given to the ball at the moment of impact is maintained under the condition that the inertial mass is maximized. Based on this characteristic, the effect of the dimple pattern on the ball surface is designed to be alleviated and reduced with respect to the horizontal rotation of the ball, and by mitigating the tendency of slices and hooks generated by incorrect hitting It can help improve your score.

[0007]

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a slice reducing action of a golf ball.

[Explanation of symbols]

 Reference Signs List 1 golf ball 2 vertical axis 3 rotation axis 4 horizontal line 5 maximum inertial mass surface 6 dimple range right 7 dimple range left 8 dimple 9 angle 10, 11, 12, lift distribution 13 lift 14 horizontal component 15 vertical component 16, 17 horizontal Component 18, 19 Vertical component

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[Procedure amendment]

[Submission date] October 2, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

SUMMARY OF THE INVENTION In a golf ball having an increased inertial mass around a specific rotation axis, the rotation axis of the ball coincides with the maximum inertial mass rotation axis in an initial stage of flight. That is,
Always rotate around a particular axis. Therefore, the dimple pattern for enhancing the lift of the ball has a certain effect even if it is not necessarily uniform over the entire surface. Assuming that the ball is accurately hit and the ball is rotating around the horizontal axis, the dimple pattern is effective enough if it is provided mainly on its vertical surface, so it is close to the rotation axis, so-called flank There is not much effect even if it is provided. However, providing the dimple pattern uniformly on the entire surface means providing the same dimple pattern on the side surface that does not significantly contribute to the lift, as described later, the dimple pattern on this side portion has a rotation axis inclined. In this case, a horizontal bending force that causes slicing and hooking is promoted. Therefore, with respect to the flying direction of preferentially ball portion close to the maximum inertial mass surface
By applying a dimple pattern having a greater lift effect, it is possible to design a ball that is difficult to slice and hook and has a moderate lift force.

Claims (4)

[Claims] In a golf ball having an increased inertial mass with respect to a specific rotation axis passing through a center point, the aerodynamic lift effect of dimples on the ball surface is orthogonal to the rotation axis and is arbitrary through the center point. A golf ball characterized by having an enhanced aerodynamic lift effect on a rotating shaft. 2. A golf club characterized in that the dimple pattern on the surface of a portion farther than two specific planes located at least 5 mm from the center point and parallel to the left and right of the center point is changed from the other portions. ball. 3. A golf ball having a dimple pattern in which a lift effect of a dimple pattern located far from an intersection of a specific plane passing through the center point and a surface of the ball is set to be lower. 4. A dimple pattern in which the aerodynamic lift effect due to dimples decreases as the distance from the intersection of a specific plane on which high specific gravity particles are arranged and the ball surface increases to increase the inertial mass. Golf ball having.