Abstract: An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the dub face.

Abstract: An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filler, the base resin contains a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the porous filler contains SiO2 in an amount of 50 mass % or more as a constituent component.

Abstract: An object of the present disclosure is to provide a golf ball having excellent flight distance on driver shots and good spin rate on middle iron shots. The present disclosure provides a golf ball comprising a spherical core and a cover, wherein a hardness difference (C1-C0), a hardness difference (C2-C1), a hardness difference (C3-C2) and a hardness difference (C4-C3) are more than 0 and 6.0 or less, a hardness difference (C5-C4) is 5.0 or more, and a hardness difference (C6-C5), a hardness difference (C7-C6) and a hardness difference (C8-C7) are more than 0 and 3.5 or less where C0 (center), C1, C2, C3, C4, C5, C6, C7 and C8 (surface) are a Shore C hardness at each point from the center obtained by dividing a radius of the spherical core into equal eight parts.

Abstract: A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The main body 4 includes a spherical core 8, a mid layer 10 positioned outside the core 8, and a cover 12 positioned outside the mid layer 10. An indentation depth, measured when the paint layer 6 in a cross-section along a plane passing through a central point of the golf ball 2 is pressed by a force of 30 mgf in a direction perpendicular to the cross-section, is not less than 300 nm and not greater than 3000 nm. The paint layer 6 preferably has a thickness of not less than 5 ?m and not greater than 50 ?m.

Abstract: An object of the present invention is to provide a golf ball having improved ball speed or aerodynamic performance on a rainy day or the like by controlling the formulation of the paint film. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein a paint film surface of the golf ball has a water contact angle A1 of 70° or more and a water sliding angle B1 of less than 50°. The present invention also provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein when a sheet consisting of a slab formed from a composition constituting a golf ball body surface and a coating film formed by applying a paint constituting the paint film on the slab is prepared, a coating film surface of the sheet has a water contact angle A2 of 90° or more and a water sliding angle B2 of less than 52°.

Abstract: 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.

Abstract: 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.

Abstract: A golfer-oriented information providing method includes steps of inputting needs information regarding a golf swing to a computer, inputting swing attention points and advice information with an information provision priority, inputting reference golf swing information, importing first needs information of a first golfer, inputting first golf swing information of the first golfer, retrieving first reference golf swing information based on the first needs information by the computer, extracting a difference between the first reference golf swing information and the first golf swing information regarding the swing attention points of the first needs information, and selecting the advice information based on a magnitude of the difference and the information provision priority and providing the selected advice information to the first golfer.

Abstract: A golf ball can include a core, a mid layer, and a cover. The golf ball can satisfy the following mathematical formulas (1) and (2), (Fa/Fan)?0.90??(1), (Fa/Fan)2/(Fp/Fpn)?0.90??(2), wherein Fa represents a maximum vertical force of the golf ball measured under a first condition. Fan represents a maximum vertical force of a standard ball measured under the first condition, Fp represents a maximum vertical force of the golf ball measured under a second condition, and Fpn represents a maximum vertical force of the standard ball measured under the second condition.

Abstract: A golf ball can include a core, mid layer, and a cover. The golf ball can satisfy the following mathematical formulas (1) and (2), Fw / Fwn ? 0.98 Fw / Fwn 2 / Fp / Fpn ? 0.98 , wherein Fw represents a maximum vertical force of the golf ball measured under a first condition, Fwn represents a maximum vertical force of a standard ball measured under the first condition, Fp represents a maximum vertical force of the golf ball measured under a second condition, and Fpn represents a maximum vertical force of the standard ball measured under the second condition.

Abstract: A golf ball includes a core, a mid layer, and a cover. A ratio R1 calculated by mathematical formula (1): R1=(Df1?Df2)/(Df2?Df3) is not less than 5.00. A ratio R2 calculated by mathematical formula (2): R2=(T2*H2)/H3 is not less than 2.00. A ratio R3 calculated by mathematical formula (3): R3=D1/T3 is not less than 50. In mathematical formulas (1) to (3), Df1 represents an amount of compressive deformation of the core, Df2 represents an amount of compressive deformation of a sphere including the core and the mid layer, Df3 represents an amount of compressive deformation of the golf ball, T2 represents a thickness of the mid layer, H2 represents a hardness of the mid layer, H3 represents a hardness of the cover, D1 represents a diameter of the core, and T3 represents a thickness of the cover.

Abstract: A golf ball includes a core, a mid layer, and a cover. A ratio R1 calculated by mathematical formula (1): R1=(Df1?Df2)/(Df2?Df3) is not less than 5.00. A ratio R2 calculated by mathematical formula (2): R2=(T2*H2)/H3 is not less than 2.00. A ratio R3 calculated by mathematical formula (3): R3=D1/T3 is less than 50. In mathematical formulas (1) to (3), Df1 represents an amount of compressive deformation of the core, Df2 represents an amount of compressive deformation of a sphere including the core and the mid layer, Df3 represents an amount of compressive deformation of the golf ball, T2 represents a thickness of the mid layer, H2 represents a hardness of the mid layer, H3 represents a hardness of the cover, D1 represents a diameter of the core, and T3 represents a thickness of the cover.

Abstract: An object of the present disclosure is to provide a golf ball having excellent spin performance on approach shots. The present disclosure provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film contains, as a base resin, a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the outermost layer of the paint film has tackiness of 0.294 N or more measured with a friction tester.

Abstract: An object of the present disclosure is to provide a golf ball from which stains are easily removed. The present disclosure provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film contains, as a base resin, a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the outermost layer of the paint film has tackiness of less than 0.294 N measured with a friction tester.

Abstract: A method for providing information to a golfer includes a voice information acquiring step of acquiring, by a portable terminal, voice information emanated by the golfer, an information identifying step of analyzing the voice information by the portable terminal or a computer with the voice information received from the portable terminal to identify a piece of advice information suitable for the golfer from an advice information table including a plurality of pieces of the advice information recorded in advance in the portable terminal or the computer, and an information output step of outputting the piece of the advice information identified in the information identifying step from the portable terminal in a manner perceptible to the golfer.

Abstract: A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The main body 4 includes a spherical core 8, a mid layer 10 positioned outside the core 8, and a cover 12 positioned outside the mid layer 10. An indentation depth, measured when the paint layer 6 in a cross-section along a plane passing through a central point of the golf ball 2 is pressed by a force of 30 mgf in a direction perpendicular to the cross-section, is not less than 300 nm and not greater than 3000 nm. The paint layer 6 preferably has a thickness of not less than 5 ?m and not greater than 50 ?m.

Abstract: An object of the present invention is to provide a golf ball having improved spin performance on wedge shots under a wet condition such as rain by controlling the formulation of the paint film. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein the paint film contains a base resin and a porous filler, and the porous filler contains SiO2 as a constituent in an amount of 50 mass % or more.

Abstract: A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The main body 4 includes a spherical core 8, a mid layer 10 positioned outside the core 8, and a cover 12 positioned outside the mid layer 10. An indentation depth, measured when the paint layer 6 in a cross-section along a plane passing through a central point of the golf ball 2 is pressed by a force of 30 mgf in a direction perpendicular to the cross-section, is not less than 300 nm and not greater than 3000 nm. The paint layer 6 preferably has a thickness of not less than 5 ?m and not greater than 50 ?m.

Abstract: A golf ball 2 includes a core 4, an inner cover 6 positioned outside the core 4, and an outer cover 8 positioned outside the inner cover 6. The core 4 has a capsule 14, a plurality of separators 16, an electronic unit 18, and a plurality of fillings 20. The capsule 14 has a melting point of not lower than 100° C. A ratio P1 of a volume Vr of the capsule 14 to a volume Vc of the core 4 is not less than 25% and not greater than 75%. The electronic unit 18 is housed in the capsule 14. The electronic unit 18 detects behavior of the golf ball 2.

Abstract: An object of the present invention is to provide a golf ball having high visibility and excellent orientation at shot. The present invention provides a golf ball comprising a core, at least one intermediate layer covering the core, and a cover covering the intermediate layer, wherein the golf ball surface has a first region with a first color and a second region with a second color, and when a color difference between a surface of an outermost layer of the intermediate layer and the first region of the golf ball surface is represented by ?Ems1, and a color difference between the surface of the outermost layer of the intermediate layer and the second region of the golf ball surface is represented by ?Ems2, ?Ems2/?Ems1?4.0 and ?Ems1?20 are satisfied.