JPH01268579A - Golf ball - Google Patents

Abstract

PURPOSE: To provide a golf ball of making possible to reduce an aerodynamic resistance and make easy to cleaning by composing of that a globe shaped outer surface has a plurality of a dimples and the each dimple has the plane surface of a non-arc shape and the section of arc-shape. CONSTITUTION: A globe shaped outer surface has a plurality of dimples and the each dimple has the plane surface of a non-arc shape and the section of arc-shape. The dimple is preferable to be equally arranged on the surface of a golf ball. The rand distance between mutually adjacent dimples can keep constant and the shape of plane surface of the dimple can be a rectangular, triangular or polygonal shape. For example, the dimple 10 has an almost square surface and its length of one side is in range between 2mm and 5mm. The dimple 10 has the sectional shape of an almost arc-shape, its average depth is in range between 0.1mm and 0.3mm. According to these arrangements, the advantage of more equal spatial arrangement (rand distance), the minimization of the aerodynamic resistance and the improved appearance of the golf ball can be combined together.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to dimple patterns in golf balls, and more particularly to the relationship between dimple shape, dimple cross-sectional shape, and spatial arrangement of dimples on a golf ball.

It is well known to provide daingles or other discontinuities in the outer surface of a golf ball to minimize aerodynamic drag on the golf ball. Aerodynamic drag can also be reduced by providing a uniform spacing between adjacent dimples (referred to below as land distance), and this uniform land distance also means that the dimples have a non-arc shape (e.g. It is also well known that they are most conveniently formed when they are rectangular or polygonal.

However, in prior known attempts to provide non-arc shaped dimples as described above, the cross-sectional shape of the dimples has also been non-arc shaped. Although such dimples contributed to the aerodynamic properties of the pole, they had the disadvantage that the poles became dirty easily and the poles were very difficult to clean.

Until now, golf balls having a non-arc-shaped plane and a non-arc-shaped cross-sectional shape have not been accepted by players.

By providing dimples with non-arc planar surfaces and arcuate cross-sectional shapes, the inventors have achieved the advantages of uniform spatial alignment (land distance), minimizing aerodynamic drag, and improving golf ball stability. We have found that all of the improved appearances can be combined.

Accordingly, the present invention provides a golf ball of the type having a plurality of dimples on a spherical outer surface, each dimple having a non-arc shaped plane and an arcuate cross section. Preferably, the dimples are uniformly arranged on the surface of the golf ball.

The present invention also provides a golf ball with a constant land distance between adjacent dimples.

The planar shape of the dimples can be rectangular, triangular, or polygonal.

The arcuate cross-sectional shape of the dimples is conveniently formed as a rotating body obtained by rotating a planar curve about the radial line of the golf ball. For example, the shape of the dimple can be a partially spherical shape or a partially ellipsoidal shape.

The present invention will be described in detail below with reference to the drawings.

The dimples IO have approximately square planes, and their side lengths range between 2 mm and 5 mm.

As shown in FIGS. 2 and 3, the dimples 10 have a substantially arcuate cross-sectional shape, and the average depth is 0.
The range is between 1 mm and 0.3 mm.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one of the dimples of the golf ball of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line l1l-III in FIG. It is a diagram.

Claims (1)

[Scope of Claims] 1. A golf ball having a plurality of dimples on a spherical outer surface, wherein each dimple is non-arcuate in a plane and arcuate in a cross section. 2. The golf ball of claim 1, wherein the dimples are uniformly arranged over the entire outer surface of the spherical shape. 3. The golf ball according to claim 2, wherein a uniform land distance is defined between any two adjacent dimples. 4. Claims 1 to 3, wherein each dimple has a triangular, rectangular, or polygonal planar shape.
A golf ball according to any of the above. 5. The cross-sectional shape of each of the dimples has the shape of a rotating body formed by rotating a plane curve around a radial line of the golf ball, for example, a partially spherical shape or a partially elliptical shape. Claims 1 to 4
A golf ball according to any of the above.