An object of the present invention is to provide a golf ball travelling a great flight distance on driver shots on a rainy day or the like and having excellent spin performance on approach shots. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body and composed of at least one layer, wherein an outermost layer of the paint film is formed from a paint containing a curable silicone resin, a curing catalyst, and a reactive silicone oil.

An object of the present invention is to provide a golf ball travelling a great flight distance on driver shots on a rainy day and having excellent spin performance on approach shots. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body and composed of at least one layer, wherein an outermost layer of the paint film is formed from a paint containing a polyol, a polyisocyanate, and a carbinol modified silicone oil different from the polyol compound.

A 3-axis magnetometer inside a golf ball to detect the impact location on golf club heads that contain ferrous materials is disclosed herein. Key aspects of a golf shot are determined from within the golf ball itself. A magnetometer, preferably running at 85 Hz, inside a golf ball is able to measure spins of 5000 RPM. An integrated circuit comprises a gyroscope, a magnetometer, and a BLUETOOTH low energy (BTLE) radio, and at least one battery. A body is composed of an epoxy material, and the body encompasses the integrated circuit.

Golf balls having covers made of thermoplastic polyurethane compositions are provided. Multi-piece golf balls can be made. In one embodiment, the outer cover layer is formed from a composition comprising a thermoplastic polyurethane and polydimethylsiloxane compound. Functionalized polydimethylsiloxane compounds also can be used to treat thermoplastic polyurethane golf ball covers. The cover composition and surface coatings can further include catalysts, ultraviolet (UV)—light stabilizers, and other additives. The coating methods have many benefits and the finished balls with thermoplastic polyurethane covers have good physical properties.

The present invention relates to a safety golf ball for practice and, more specifically, to a safety golf ball for practice, by which a similar effect to the practice using a real golf ball can be obtained and a safety accident can be prevented. To this end, the safety golf ball for practice includes a soft outer core on an existing inner core so as to have a fast elasticity recovery speed.

A golf ball alignment device includes a golf ball having an exterior surface. Indicia is disposed on the exterior surface of the golf ball. The indicia include first and second line segments extending along a portion of the golf ball at a spaced interval. The spaced interval is narrower at a first end of each line segment than at a second end of each line segment such that the line segments converge from the second end of the line segments to the first end of the line segments. The indicia provide an alignment reference on the golf ball for a user to align the line segments with at least one of an intended direction of travel of the golf ball and a club head used to strike the ball in the intended direction of travel.

A first stamp and a second stamp are printed on the surface of a golf ball such that a transition printed area of the first stamp overlaps a transition printed area of the second stamp to create an overlap printed area between a main printed area of the first stamp and a main printed area of the second stamp. An ink density of the main printed area of the first stamp, an ink density of the main printed area of the second stamp, and an ink density of the overlap printed area are approximately the same after both the first stamp and the second stamp are printed on the surface of the golf ball.

A method for printing a marking on a golf ball includes arranging ink in an etching pattern on a printing plate, matching a reference position on the plate to a reference position on the golf ball, transferring the ink from the printing plate to a pad, and transferring the ink from the pad to the golf ball such that the golf ball includes the marking. The pattern includes an etch corresponding to the marking, wherein the etch differs from the marking in a manner dependent on the position of the marking on the golf ball. The marking that results on the golf ball is a linear marking, and a centerline of the linear marking lies entirely within a marking plane that is not a centerline plane of the golf ball, and wherein the edges of the marking are parallel with the marking plane.

A golf ball sorting system has a ball feeder, a ball mover, a detector, and a sorting system. The ball feeder may be configured to receive a plurality of golf balls. The ball mover may be configured to move each of the plurality of golf balls one at a time at a predetermined minimum speed. The detector may be configured to inspect each of the plurality of golf balls moved by the movement mechanism and output a detection result based on the inspection. The sorting system may be configured to receive the detection result and sort the plurality of golf balls based on the detection result to separate golf balls that include a mark that is not visible to an observer from golf balls that do not include a mark.

A method for printing a marking on a golf ball includes arranging ink in an etching pattern on a printing plate, matching a reference position on the plate to a reference position on the golf ball, transferring the ink from the printing plate to a pad, and transferring the ink from the pad to the golf ball such that the golf ball includes the marking. The pattern includes an etch corresponding to the marking, wherein the etch differs from the marking in a manner dependent on the position of the marking on the golf ball. The marking that results on the golf ball is a linear marking, and a centerline of the linear marking lies entirely within a marking plane that is not a centerline plane of the golf ball, and wherein the edges of the marking are parallel with the marking plane.