BACKGROUND OF THE INVENTION Generally, golf balls are typically classified into one-piece golf balls, two- piece golf balls and three-piece golf balls. The one-piece golf balls entirely consist of high resilient composite material made of rubber and resin, and the two-piece golf balls include a double structure of a solid core of molded synthetic rubber and a reinforced thermoplastic resin covering the solid core. The three-piece golf balls comprise a two-layer core with rubber threads wound in the central part thereof and a cover covering the core. A typical golf ball is formed as a whole on its surface with a plurality of dimples of a prescribed pattern, which is designed to reduce resistance of air when the golf ball is hit and to improve flight distance.

As a prior art describing the typical golf ball, Korean Laid-open Publication No. 2002-7836 is disclosed and illustrated in FIG 1, where the golf ball comprises a

resilient inner core (10), a resilient outer core (20) and a cover (30). The outer core (20) includes a plurality of reinforcing members radially extended from an inner circumference to an outer circumference of the outer core. When the golf ball thus constructed is struck by a golf club, the striking force is directly transmitted to a golf ball and no deformation is made at the point where the striking force is applied on the golf ball. As a result, the time gap between the striking of the golf ball and the take-off of the golf ball by the repulsive and resilient force is shortened, thereby improving the flight distance.

The dimple structure of the conventional golf ball thus constructed has been improved without deviating from using the conventional material thereof. However, there is a drawback in that an impact energy is not properly transmitted to an inner core of the golf ball when the golf ball is hit by a golf club, whereby a circumferential shape of the golf ball is deformed upon impact, resulting in a horizontal deflection different from the desired hitting direction of the golfer.

SUMMARY OF THE INVENTION The present invention is disclosed to solve the aforementioned drawbacks and it is an object of the present invention to provide a dimple structure of a golf ball constructed to directly transmit a striking energy to an inner core side of a golf ball during impact without recourse to material changes, and to reduce the spin rate and drag of fluid for improvement of flight distance when the golf ball is hit.

In accordance with a preferred embodiment of the present invention, there is provided a dimple structure of a golf ball, the golf ball including a spherical inner core positioned in an inner center of a golf ball, an outer core filled at an appropriate thickness on an external side of the inner core and a plurality of impact-transmitting members provided inside the outer core and transmitting an impact force delivered from the outside to the inner core, wherein the structure comprises a surface part, and wherein each distal end of the impact-transmitting members of the golf ball is provided to an outside thereof, and the surface part is formed with a plurality of multifaceted patterns of equilateral triangles.

Preferably, the dimple structure of the golf ball is protrusively formed with embossed dimples on the surface part thereof.

Preferably, the dimple structure of the golf ball is such that each central distal end of the plurality of the impact-transmitting members is positioned at each vertex of the equilateral triangles, and each central distal end of the plurality of impact- transmitting members is positioned at each central part of the equilateral triangles.

BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the nature and objects of the present invention, reference should be made to the following detailed description with the accompanying drawings, in which: FIG 1 is a cut-out perspective view of a three-piece golf ball according to the

prior art; FIG 2 is a perspective view of a dimple structure of a golf ball according to an embodiment of the present invention; FIG 3 is a cross-sectional view of FIG 2; FIG 4 is a perspective view of essential parts for schematically illustrating a dimple structure of a golf ball according to an embodiment of the present invention; FIG 5 is a perspective view of essential parts for schematically illustrating a dimple structure of a golf ball according to another embodiment of the present invention; FIG. 6 is a perspective view for illustrating an impact-transmitting member according to the present invention; FIG 7 is a perspective view for illustrating a coupled state between an impact- transmitting member and a guide member according to the present invention; and FIG. 8 illustrates a used constitutional state of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will now be described in detail with reference to the annexed drawings, where the present embodiments are not limiting the scope of the present invention but are given only as an illustrative purpose.

As illustrated in FIGS. 2 through 8, the dimple structure of a golf ball (1) according to the present invention includes a spherical inner core (100) comprising an

inner nucleus (110) and an outer nucleus (120), an outer core (200) filled at an external side of the inner core (100), a plurality of impact-transmitting members (300) provided within an inside of the outer core (200) and supported by the inner core (100) and directly transmitting outside impact to the inner core (100) side, and a surface part (400) on which external distal ends of the impact-transmitting members (300) are positioned to form multifaceted equilateral triangles.

To be more specific, the surface part (400) serves to cover an external surface of the outer core (200), where sides of the respective equilateral triangles are formed higher than the central portions thereof. Furthermore, each triangle is formed with embossed dimples (410). Although the present embodiment has exemplified the triangles with embossed (convex) dimples, the triangles may be formed with concave dimples.

The inner core (100) has a dual structure. In other words, the inner core (100) comprises: a spherical inner nucleus (110) positioned at a center thereof ; and an outer nucleus (120) directly contacting the circumference of the inner nucleus (110).

The outer nucleus (120) is formed with a plurality of support holes (122) into which the plurality of impact-transmitting members (300) can be inserted at distal ends thereof.

Each impact-transmitting member (300) is generally cone-shaped, and as illustrated in FIG 6, each central distal end of the impact-transmitting member may be positioned at a vertex of the equilateral triangle surface of the surface part (400), and

as illustrated in FIG 5, the central portion of the equilateral triangle may be protrusively formed to function as a dimple (410). The protrusive dimple is intended to directly transmit the striking force to the central portion of the golf ball, i. e. , to the inner core (100) side, from a struck portion when the ball is hit.

The impact-transmitting member (300) is circumferentially formed with an extended inclined surface (310) of an appropriate angle for easily transmitting the external impact energy to the inner core (100) side.

Preferably, each impact-transmitting member (300) is circumferentially coupled with a trigonal guide member (350), and each impact-transmitting member (300) is constructed such that both ends thereof are exposed from both upper and lower sides of the guide member (350).

The guide member (350) may be formed at a distal end thereof, forming a triangular surface portion along the surface part (400). The impact-transmitting member (300) is longitudinally formed at a lower position thereof with a plurality of circular lugs (33) for being coupled with the guide member (350). The outer core (200) is formed by sequentially molding synthetic resin to have a multi-layer shape, and the radius from each vertex of the respective equilateral triangle on the surface part to the central portion of the golf ball is constant. Furthermore, each vertex and side of the equilateral triangle and central dimple areas are all relatively convex and the other balance areas are all concave such that the surface part has dual or triple prominences and depressions.

The operation of the present invention thus constructed will now be described.

First, a manufacturing process will be briefly explained. The spherical inner core (110) is manufactured by cast, and the inner core (110) is covered and sealed by a bi-sectional outer core (120). Then the support holes (122) of the outer core (120) are inserted by distal ends of the impact-transmitting members (300), on which the surface part (400) is covered.

Preferably, the impact-transmitting members (300) are circumferentially coupled with the guide members (350) before being coupled with the outer core (120).

Thereafter, protrusive distal ends of the impact-transmitting members (300) are cut and trimmed for a final finishing touch.

Furthermore, when the trigonal guide members (350) are coupled to the support holes (122) of the outer core (120) outside of the distal ends of the impact- transmitting members (300), the circular lugs (330) circumferentially formed at the lower portion of the impact-transmitting members (300) contact an inner circumference of the guide members (350) to thereby improve the coupling force.

Distal ends of the guide members (350) are so formed as to match with portions of the surface part (400) to thereby allow constructing multifaceted equilateral triangles defining the surface part (400).

In the golf balls thus manufactured, the striking force is transmitted from a struck part of the golf ball to the inner nucleus (110) of the inner core (100) via the impact-transmitting members (300) when the golf ball is hit by a golf club, and the

golf ball is lifted upwards from the ground by the striking force to receive a drag and a lift.

When the striking energy is transmitted to the golf ball from the head of the golf club, the striking energy is directly transmitted to the inner core (100) side via the impact-transmitting members (300) from the surface part (400) at the struck portion of the golf ball, whereby the impact acts as a force necessary for flight of the golf ball (1).

Under these circumstances, a repulsive force is generated by the striking force transmitted to the inner core (100) side, and the repulsive force is transmitted from the inner nucleus (110) side to the outside via the impact-transmitting members (300) such that deformation is not generated on the struck portion of the golf ball (1).

The vertex of the triangle on the surface part (400) minimizes the drag while the golf ball is in flight. The vertex of the surface part (400) causes a turbulent boundary layer, i. e. , a thin boundary layer of airto smoothly deviate from the flying direction of the golf ball, along the outer surface of the golf ball, thereby contributing to a substantial reduction in drag.

In other words, the vertexes and sides of the equilateral triangles and depressions of the dimples cause the air and fluid to smoothly deviate from the flying direction of the golf ball, thereby contributing to a reduction in fluid resistance.

Furthermore, when the golf ball (1) hits the ground following its flight in the air, the embossed dimples serve to reduce the surface area contacting the ground, thereby decreasing the resistance caused by the rolling friction with the ground and

contributing to an increased flying and rolling distance of the golf ball.

The foregoing description of the preferred embodiments of the present invention has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the invention. It is intended that the scope of the invention be defined by the claims appended hereto, and their equivalents.

The present invention relates to a structure-improved golf ball adapted to prevent deformation of the golf ball caused by the striking force that occurs when the ball is hit, reduce drag and increase the flight distance of the ball.

As apparent from the foregoing, there is an advantage in the dimple structure of a golf ball thus described according to the embodiments of the present invention in that the outer surface of the golf ball is structured to reduce a drag of fluid, thereby contributing to an increased flight distance of the ball.

There is another advantage in that the deformation rate of the struck area of a golf ball is minimized, thereby contributing to a decreased generation of spin rate in relation to the flying direction of the ball.