Abstract: A golf ball having a core, an intermediate layer enclosing the core and a cover enclosing the intermediate layer is characterized in that the intermediate layer and cover are each made from an ionomer resin-containing thermoplastic resin. The golf ball is also characterized in that the core has a diameter of at least 36.7 mm but not more than 40.7 mm, the core has a deflection when subjected to a load of 100 kg of at least 3.5 but not more than 6.0 mm, the intermediate layer has a thickness of at least 0.50 mm but not more than 1.40 mm, the intermediate layer has a Shore D hardness of at least 40 but not more than 55, the cover has a thickness of at least 0.50 mm but not more than 1.40 mm, the cover has a Shore D hardness of at least 60 but not more than 70, the golf ball has a deflection when subjected to a load of 100 kg of at least 2.8 mm but not more than 4.5 mm, and the deflection by the core under 100 kg load minus the deflection by the golf ball under 100 kg load is less than 1.0 mm.

Abstract: In the present invention, by optimizing the balance of Shore D hardness between the intermediate layer and the cover, the balance of Shore D hardness between the surface and the center in the core, the balance of initial velocity between the core and the sphere, and the balance of Deflection amount between the core and the sphere are optimized, and the total thickness of the intermediate layer and the cover, the inventive golf ball is given a good profile of rebound, feel, controllability and durability.

Abstract: Disclosed herein is a solid golf ball made up of a core and at least one cover, wherein said core is formed mainly from a polybutadiene which is synthesized with using a catalyst of rare earth element such that the content of cis-1,4 bond is no less than 60%, said core has a diameter of 34.7 to 42.0 mm, said core undergoes deflection amounting to 2.5 to 5.0 mm under a load of 100 kg, said cover has an outermost cover layer which is formed mainly from a thermoplastic resin or elastomer compounded with organic short fibers, said outermost cover layer has a Shore D hardness of 55 to 70 and a thickness of 0.5 to 2.0 mm, and said ball weighs 40.0 to 44.9 g. The solid golf ball excels in both flying performance and crack resistance and permits novice golfers to increase flying distance even when it is hit with a low head speed.

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 multi-piece golf ball includes a core having a diameter of 30 to 40 mm, at least one intermediate layer including the outermost layer having a thickness of 0.5 to 2.0 mm, and a cover having a thickness of 1.0 to 3.0 mm. The cover is made from a material obtained by dispersedly blending at least one kind of silicone powder selected from a silicone rubber powder, a silicon resin powder, and a composite powder thereof, in a main resin component containing an ionomer resin in an amount of 50% by weight or more. Dimples of the number of 300 to 550 pieces are formed in the surface of the golf ball in such a manner that a dimple total volume ratio VR is in a range of 0.85% or less. The multi-piece golf ball is excellent in resilience, flight distance characteristic, and feel of hitting.

Abstract: Disclosed herein is a multi-piece golf ball composed of a core and an outermost cover layer, with one or more inner cover layers interposed between them, which is characterized in that the core is made mainly of a polybutadiene which is synthesized with using a catalyst of rare earth element such that the content of cis-1,4 bond is no less than 60%, the core has a diameter of 34.7 to 40.7 mm, the core undergoes deflection amounting to 3.0 to 5.0 mm under a load of 100 kg, the outermost cover layer is formed mainly of a thermoplastic resin or elastomer compounded with organic short fibers, the outermost cover layer has a Shore D hardness of 55 to 70 and a thickness of 0.5 to 2.0 mm, and the inner cover layer has a Shore D hardness of 15 to 55 and a thickness of 0.5 to 2.0 mm. The multi-piece golf ball exhibits good flying performance and crack durability. In addition, it gives the player a good striking feel at the time of putting and driver shot.

Abstract: Disclosed herein is a solid golf ball made up of a core and at least one cover, wherein said core is formed mainly from a polybutadiene which is synthesized with using a catalyst of rare earth element such that the content of cis-1,4 bond is no less than 60%, said core has a diameter of 34.7 to 42.0 mm, said core undergoes deflection amounting to 2.5 to 5.0 mm under a load of 100 kg, said cover has an outermost cover layer which is formed mainly from a thermoplastic resin or elastomer compounded with organic short fibers, said outermost cover layer has a Shore D hardness of 55 to 70 and a thickness of 0.5 to 2.0 mm, and said ball weighs 40.0 to 44.9 g. The solid golf ball excels in both flying performance and crack resistance and permits novice golfers to increase flying distance even when it is hit with a low head speed.

Abstract: A golf ball comprising a core, an intermediate layer, and a cover 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, 0.90?(Deflection amount of the core enclosed with the intermediate layer)/(Deflection amount of the core)?1.00, and the total thickness (in mm) of the intermediate layer and the cover is up to 3.0 mm.

Abstract: Disclosed herein is a multi-piece golf ball composed of a core and an outermost cover layer, with one or more inner cover layers interposed between them, which is characterized in that the core is made mainly of a polybutadiene which is synthesized with using a catalyst of rare earth element such that the content of cis-1,4 bond is no less than 60%, the core has a diameter of 34.7 to 40.7 mm, the core undergoes deflection amounting to 3.0 to 5.0 mm under a load of 100 kg, the outermost cover layer is formed mainly of a thermoplastic resin or elastomer compounded with organic short fibers, the outermost cover layer has a Shore D hardness of 55 to 70 and a thickness of 0.5 to 2.0 mm, and the inner cover layer has a Shore D hardness of 15 to 55 and a thickness of 0.5 to 2.0 mm. The multi-piece golf ball exhibits good flying performance and crack durability. In addition, it gives the player a good striking feel at the time of putting and driver shot.

Abstract: A multi-piece solid golf ball has a solid core obtained by molding and vulcanizing a rubber composition which includes (A) a base rubber containing a polybutadiene synthesized using a rare-earth catalyst, (B) an unsaturated carboxylic acid and/or a metal salt thereof, (C) an organic sulfur compound, (D) an inorganic filler and (E) an organic peroxide. The core is enclosed within a mantle of one or more layer which is made primarily of a thermoplastic resin and has a Durometer D hardness of 30 to 70. The mantle is enclosed within a cover which is made primarily of a thermoplastic polyurethane and which has a Durometer D hardness of 40 to 60 that is lower than the Durometer D hardness of the outermost layer of the mantle. This construction provides the golf ball with an outstanding rebound.

Abstract: A golf ball comprising a core, an intermediate layer, and a cover 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.

Abstract: A golf ball comprising a core having a Deflection amount of at least 3.0 mm and up to 6.0 mm, an intermediate layer, and a cover 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.

Abstract: Before shipment, an LED column in the direct color thermal printer is driven by a maximum current for maximum light emission. While driving, a voltmeter and a light amount sensor measure temporal change in drive voltage and light amount of the LED column. The system controller, based on the measurement result, obtains a slope and an intercept of the first-order equation representing the linear portion for the response of the light amount to variation of the drive voltage, and a threshold voltage at a point the response changes from linear to nonlinear. These values are stored in EEPROM. When driving the two dimensional LED array, the system controller obtains a target drive voltage with referring to the drive profile, then controls the current such that the drive voltage of the light emitting element becomes the target drive voltage and does not become below the threshold voltage.

Abstract: A multi-piece golf ball includes a core having a diameter of 30 to 40 mm, at least one intermediate layer including the outermost layer having a thickness of 0.5 to 2.0 mm, and a cover having a thickness of 1.0 to 3.0 mm. The cover is made from a material obtained by dispersedly blending at least one kind of silicone powder selected from a silicone rubber powder, a silicon resin powder, and a composite powder thereof, in a main resin component containing an ionomer resin in an amount of 50% by weight or more. Dimples of the number of 300 to 550 pieces are formed in the surface of the golf ball in such a manner that a dimple total volume ratio VR is in a range of 0.85% or less. The multi-piece golf ball is excellent in resilience, flight distance characteristic, and feel of hitting.

Abstract: An optical fixing device is provided with a light emitting element array that consists of a plural number of LEDs connected in a matrix. The LEDs are connected in serial to each other in each column, and the LED columns are connected in parallel to each other. Transistors are connected in serial to the LED columns respectively, so as to turn the associated LED columns ON or OFF. A capacitor is connected in parallel to the LED columns. After the capacitor is charged by turning a switch ON, selected one of the LED columns is turned ON, to discharge the capacitor through the selected LED column. Based on a voltage across the capacitor at the completion of discharging, a forward voltage VFL across the selected LED column is measured.

Abstract: A golf ball having a core, an intermediate layer enclosing the core and a cover enclosing the intermediate layer is characterized in that the intermediate layer and cover are each made from an ionomer resin-containing thermoplastic resin. The golf ball is also characterized in that the core has a diameter of at least 36.7 mm but not more than 40.7 mm, the core has a deflection when subjected to a load of 100 kg of at least 3.5 but not more than 6.0 mm, the intermediate layer has a thickness of at least 0.50 mm but not more than 1.40 mm, the intermediate layer has a Shore D hardness of at least 40 but not more than 55, the cover has a thickness of at least 0.50 mm but not more than 1.40 mm, the cover has a Shore D hardness of at least 60 but not more than 70, the golf ball has a deflection when subjected to a load of 100 kg of at least 2.8 mm but not more than 4.5 mm, and the deflection by the core under 100 kg load minus the deflection by the golf ball under 100 kg load is less than 1.0 mm.

Abstract: A golf ball having a core, an envelope layer enclosing the core, an intermediate layer enclosing the envelope layer and a cover enclosing the intermediate layer is characterized in that the core is made from a specific rubber composition which has been molded and vulcanized, the envelope layer is made from a thermoplastic resin, the intermediate layer is made from a thermoplastic resin containing at least 30 wt % of an ionomer resin, and the cover is made from a thermoplastic resin containing at least 50 wt % of an ionomer resin.

Abstract: A golf ball having a core, an envelope layer enclosing the core, an intermediate layer enclosing the envelope layer and a cover enclosing the intermediate layer is characterized in that the core is made from a specific rubber composition which has been molded and vulcanized, the envelope layer is made from a thermoplastic resin, the intermediate layer is made from a thermoplastic resin containing at least 30 wt % of an ionomer resin, and the cover is made from a thermoplastic resin containing at least 50 wt % of an ionomer resin.

Abstract: A golf ball comprising a core, an intermediate layer, and a cover 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, 0.90?(Deflection amount of the core enclosed with the intermediate layer)/(Deflection amount of the core)?1.00, and the total thickness (in mm) of the intermediate layer and the cover is up to 3.0 mm.

Abstract: Disclosed herein is a two-piece solid golf ball consisting of a solid core and a cover, the solid core being formed from a rubber composition composed of a rubber base material of polybutadiene synthesized by using a catalyst of rare earth element, a small amount of organic peroxide, an unsaturated carboxylic acid and/or a metal salt thereof, an organic sulfur compound, and an inorganic filler, and the cover being formed mainly from a mixture of an ionomer-containing resin composition and an inorganic filler. The two-piece solid golf ball is by far superior to conventional ones in flying performance, cover durability, scuff resistance, and shot feeling.