Abstract: A solid golf ball is composed of a solid core and a cover of one or more layers which encloses the core and has on a surface thereof numerous dimples. The solid core has a diameter of 38.7 to 39.6 mm and a deflection hardness of 3.0 to 4.0 mm. The cover has a Shore D hardness of 59 to 70 and has 313 to 371 dimples formed thereon. The ball has an initial velocity of at least 76.8 m/s, a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, and a coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm. The golf ball has a carry which is long enough to make the ball advantageous for competitive play, in addition to which it has a good feel when hit and excellent durability to cracking with repeated impact.

Abstract: A multi-piece solid golf ball is composed of a multilayer core having at least an inner core layer and an outer core layer, one or more cover layer which encloses the core, and numerous dimples formed on a surface of the cover layer. The golf ball is characterized in that at least one cover layer is made primarily of an ionomer resin, the following hardness conditions (1) to (3) are satisfied: (1) (JIS-C hardness of cover)?(JIS-C hardness at center of core)?27, (2) 23?(JIS-C hardness at surface of core)?(JIS-C hardness at center of core)?40, and (3) 0.50?[(deflection amount of entire core)/(deflection amount of inner core layer)]?0.75, the number of dimples is from 250 to 390 dimples, and the ball has an initial velocity of at least 76.8 m/s. These features enable the ball to travel a longer distance.

Abstract: Disclosed herein is a golf ball having on its surface a number of dimples and a number of edges separating dimples from each other, wherein the edges are formed from a plurality of edge elements joined together such that some of the joining parts of the edge elements assume a smoothly curved shape as viewed from above. The golf ball has improved aerodynamic performance due to dimples and achieves a long flying distance.

Abstract: A golf ball has a plurality of polygonal dimples, each with an interior wall that includes areas formed by a plurality of flat surfaces. The ball retains a good carry without a decline in flight performance. In addition, the many novel and distinctive dimples formed on the surface of the ball cause it to glitter from the irregular reflection of light by the dimples, imparting to the ball an attractive appearance that makes it highly desirable to the consumer.

Abstract: A ballistic trajectory method for a golf ball is disclosed wherein a ballistic trajectory of a golf ball having a plurality of dimples formed on the surface thereof when the golf ball is hit to fly at an arbitrary number of rotations and an arbitrary initial speed can be estimated and ballistic trajectory and flight characteristics of the golf ball can be evaluated without depending upon experimental evaluation which is based on an actual model thereby to allow a golf ball to be developed efficiently. The ballistic trajectory of the golf ball when the golf ball is hit to fly is estimated by successively calculating the flight distance and the height of the ball after every lapse of a very short period of time after the ball is hit to fly until it drops to the ground making use of arithmetic operation by a computer.

Abstract: In a golf ball, ridges each extending to define a non-circular shape, typically a polygonal or star shape, delimiting a predetermined area are arranged on its spherical surface in good balance for reducing the air resistance of the ball in flight and thus drastically improving the flight performance.

Abstract: A golf ball which has markings of letters or figures on its surface with concave parts and/or convex parts, wherein the markings manifest themselves with depressions and/or grooves having a substantially uniform depth from the surface. The markings are clearly visible.

Abstract: A golf ball with a number of dimples within a pair of spherical isosceles triangle regions formed by imaginary lines connecting one pole and the equator. The dimples in the triangle regions are arranged in a position rotationally moved about the ball axis from a position in axial symmetry with respect to the imaginary line. The dimples on the other hemisphere are in point symmetry with the dimples as arranged on the one hemisphere with respect to the ball center.

Abstract: A multi-piece solid golf ball is composed of a multilayer core having at least an inner core layer and an outer core layer, one or more cover layer which encloses the core, and numerous dimples formed on a surface of the cover layer. The golf ball is characterized in that at least one cover layer is made primarily of an ionomer resin, the following hardness conditions (1) to (3) are satisfied: (1) (JIS-C hardness of cover)?(JIS-C hardness at center of core)?27, (2) 23?(JIS-C hardness at surface of core)?(JIS-C hardness at center of core)?40, and (3) 0.50?[(deflection amount of entire core)/(deflection amount of inner core layer)]?0.75, the number of dimples is from 250 to 390 dimples, and the ball has an initial velocity of at least 76.8 m/s. These features enable the ball to travel a longer distance.

Abstract: A golf ball composed of an elastic solid core and a resin cover enclosing said core and having a number of dimples in the surface thereof, which is characterized in that said elastic solid core has resilience such that the deformation is 3.0 to 5.0 mm when the load is increased from 98 N (10 kgf) to 1275 N (130 kgf), said cover has a gage of 1.2 to 2.1 mm and a Shore D hardness of 60 to 75, and said dimples are formed in two or more different patterns, with their number amounting to 250 to 370. This golf ball is superior in flight performance.

Abstract: A golf ball is composed of a resilient core, a cover which encloses the core, is made primarily of a polyurethane thermoplastic elastomer and has on a surface thereof 250 to 370 dimples, and at least one intermediate layer disposed between the core and the cover. The core has a center portion and a surface portion that is harder than the center portion, the hardness difference expressed in JIS-C hardness units being in a range of 15 to 30, and has a deflection of 1.8 to 4.0 mm when subjected to an increase in load from an initial load state of 98 N (10 kgf) to a load of 1,275 N (130 kgf). The intermediate layer has a Shore D hardness of 55 to 75, and the cover has a Shore D hardness of 30 to 58. The dimples, which are a combination of at least five types having contour lengths at a dimple edge position in a range of 7 to 20 mm, have a total volume of 400 to 700 mm3 and a surface coverage relative to an overall surface of the ball of at least 79%.

Abstract: A golf ball with a number of dimples within a pair of spherical isosceles triangle regions formed by imaginary lines connecting one pole and the equator. The dimples in the triangle regions are arranged in a position rotationally moved about the ball axis from a position in axial symmetry with respect to the imaginary line. The dimples on the other hemisphere are in point symmetry with the dimples as arranged on the one hemisphere with respect to the ball center.

Abstract: A golf ball having a plurality of dimples demarcated by edges on the ball's surface, characterized in that the dimples each assume a non-circular shape (as viewed form above) with mutually intersecting curved edge elements of the edges and at least one of these non-circular dimples is demarcated by the edge whose edge element bulges toward the inside of the dimple. The golf ball has improved aerodynamic performance due to dimples and achieves a long flying distance.

Abstract: In a multi-piece solid golf ball comprising an elastic solid core, an intermediate layer of ionomer resin, and a cover of urethane elastomer having a plurality of dimples on its surface, those dimples disposed in one or more rows adjacent to the equator have a greater depth and/or volume than the remaining dimples in other areas. The variation of flight performance of the ball with impact points is minimized.

Abstract: A multi-piece solid golf ball exhibits a good profile of rebound, feel and durability suited for low head speed amateur players when it satisfies the requirements that (Shore D hardness of the cover)?(Shore D hardness of the intermediate layer)>0, (initial velocity (in m/s) of the core enclosed with the intermediate layer)?(initial velocity (in m/s) of the core)>?0.2, 0.90?(Deflection amount of the core enclosed with the intermediate layer)/(Deflection amount of the core)?1.00, the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm, and the ball has a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, and a coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm.

Abstract: A golf ball of the type having a large number of convex parts projecting from the spherical surface, the convex parts assuming a round or non-round shape as viewed from above, wherein the improvement includes a large number of convex parts which are arranged such that the upper surface of the convex part has a certain radius of curvature and coincides with a hypothetical spherical surface covering the spherical surface, at least part of a large number of convex parts form a string of convex parts connected to each other through a part thereof, and the strings of convex parts form at least one great circle which is substantially continuous on the spherical surface. This golf ball is novel in appearance and excellent in flight performance.

Abstract: In a golf ball, ridges each extending to define a non-circular shape, typically a polygonal or star shape, delimiting a predetermined area are arranged on its spherical surface in good balance for reducing the air resistance of the ball in flight and thus drastically improving the flight performance.

Abstract: A golf ball having a plurality of dimples demarcated by edges on the ball's surface, characterized in that the dimples each assume a non-circular shape (as viewed form above) with mutually intersecting curved edge elements of the edges and at least one of these non-circular dimples is demarcated by the edge whose edge element bulges toward the inside of the dimple. The golf ball has improved aerodynamic performance due to dimples and achieves a long flying distance.

Abstract: In a golf ball, ridges each extending to define a non-circular shape, typically a polygonal or star shape, delimiting a predetermined area are arranged on its spherical surface in good balance for reducing the air resistance of the ball in flight and thus drastically improving the flight performance.

Abstract: In a golf ball comprising an elastic core, an intermediate layer of at least one layer, and a cover which is provided on its surface with a plurality of dimples, wherein the cover has a gage of 1.0–1.5 mm, the intermediate layer has a gage of 1.0–2.0 mm per layer, the golf ball in its entirety has a specific gravity of 1.128–1.145 g/cm3. On account of an optimum specific gravity in a relatively high range, the ball is improved in flight performance.