Abstract: A tennis ball container 4 includes a bottle 8, a paper label 10, an inner lid 12, and a paper cap 14. The bottle 8 includes a bottom 18 and a neck 20. The paper label 10 is accommodated in the bottle 8, and is positioned along an inner peripheral surface of the bottle 8. The paper label 10 can be obtained by printing paper. The paper is obtained by agglutinating biodegradable fibers together. In an axial direction of the bottle 8, a position of an upper edge 26 of the paper label 10 is the same as a position of the neck 20, or the position of the upper edge 26 of the paper label 10 is shifted from the position of the neck 20 toward the bottom 18.

Abstract: A rubber composition for a hollow ball includes a base rubber and an inorganic filler. A weight reduction rate TGA650 from room temperature to 650° C. and a weight reduction rate TGA850 from room temperature to 850° C. of the rubber composition are measured under an air atmosphere by thermogravimetry conforming to JIS K0129. The weight reduction rate TGA650 of the rubber composition is not less than 63% and not greater than 99%. A difference (TGA850?TGA650) between the weight reduction rates TGA850 and TGA650 of the rubber composition is not less than 0% and not greater than 7%. A hollow ball 2 includes a hollow core 4 formed from the rubber composition.

Abstract: A rubber composition for a tennis ball includes a base rubber and a filler having a degree of flatness DL of not less than 50, the degree of flatness DL being obtained by dividing an average particle diameter D50 (?m) of the filler by an average thickness T (?m) of the filler. An amount of the filler per 100 parts by weight of the base rubber is not less than 1 part by weight and not greater than 150 parts by weight. A gas permeability coefficient GPS and a loss tangent tan ?S of the rubber composition and a gas permeability coefficient GPL and a loss tangent tan ?L of a rubber composition obtained by replacing the filler with kaolin clay having a degree of flatness DL of 20 satisfy (1): GPL/GPS?1.02 and (2): |tan ?L?tan ?S|?0.03. A tennis ball 2 includes a core 4 formed using the rubber composition.

Abstract: An aqueous adhesive for rubber includes rubber latex and an ammonium-salt-based vulcanization acceleration aid. An amount of the ammonium-salt-based vulcanization acceleration aid contained in the aqueous adhesive is preferably not less than 0.01% by weight and not greater than 5.0% by weight in terms of solid content. An aqueous adhesive for a ball includes rubber latex as a main component. A content of an inorganic filler in the aqueous adhesive is not greater than 0.1% by weight in terms of solid content. A ball 2 includes a hollow core 4 obtained by crosslinking a rubber composition that contains a vulcanizing agent. The core 4 is formed of two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for a ball.

Abstract: A method of manufacturing a string 10 for use in a racket includes: (A) preparing an untreated string; and (B) irradiating the untreated string with radioactive rays. Preferably, the untreated string is irradiated with gamma rays. A preferable irradiation amount of the radioactive rays is greater than or equal to 250 kGy but less than or equal to 2000 kGy. Preferably, a material of the untreated string is polyester. Alternatively, the material of the untreated string may be nylon.

Abstract: A rubber composition for a tennis ball includes a base rubber and a high-flatness filler. The high-flatness filler has an average particle diameter D50 of not less than 1 ?m and not greater than 50 ?m. A degree of flatness DL is not less than 40 and not greater than 200. An amount of the high-flatness filler per 100 parts by weight of the base rubber is not less than 5 parts by weight and not greater than 100 parts by weight. A ratio (E2/E1) of a tensile elastic modulus E2 in a tensile strain range from 70% to 100% to a tensile elastic modulus E1 in a tensile strain range from 10% to 30%, of a vulcanized rubber obtained by vulcanizing the rubber composition, is not less than 0.60 and less than 1.00. The tennis ball includes a hollow core formed from the rubber composition.

Abstract: A rubber composition for a hollow ball includes a base rubber, an inorganic filler composed of a large number of flat particles, and a carbon-based filler. As to the carbon-based filler, a degree of flatness DLc obtained by dividing an average particle diameter D50c (?m) by an average thickness Tc (?m) is not less than 50. A weight ratio Mc/Mi is not less than 0.01 and not greater than 1.00. The rubber composition is obtained by a production method including: a first step of mixing the base rubber and the carbon-based filler to obtain a master batch; and a second step of adding the large number of flat particles that form the inorganic filler, to the master batch to orient the large number of flat particles. The hollow ball 2 includes a core 4 formed from the rubber composition.

Abstract: A rubber composition for a tennis ball includes a base rubber and a high-flatness filler. The high-flatness filler has an average particle diameter D50 of not less than 1 ?m and not greater than 50 ?m. A degree of flatness DL is not less than 40 and not greater than 200. An amount of the high-flatness filler per 100 parts by weight of the base rubber is not less than 5 parts by weight and not greater than 100 parts by weight. A ratio (E2/E1) of a tensile elastic modulus E2 in a tensile strain range from 70% to 100% to a tensile elastic modulus E1 in a tensile strain range from 10% to 30%, of a vulcanized rubber obtained by vulcanizing the rubber composition, is not less than 0.60 and less than 1.00. The tennis ball includes a hollow core formed from the rubber composition.

Abstract: A rubber composition for a tennis ball includes a base rubber and a filler having a degree of flatness DL of not less than 50, the degree of flatness DL being obtained by dividing an average particle diameter D50 (?m) of the filler by an average thickness T (?m) of the filler. An amount of the filler per 100 parts by weight of the base rubber is not less than 1 part by weight and not greater than 150 parts by weight. A gas permeability coefficient GPS and a loss tangent tan ?S of the rubber composition and a gas permeability coefficient GPL and a loss tangent tan ?L of a rubber composition obtained by replacing the filler with kaolin clay having a degree of flatness DL of 20 satisfy (1): GPL/GPS?1.02 and (2): |tan ?L?tan ?S|?0.03. A tennis ball 2 includes a core 4 formed using the rubber composition.

Abstract: An aqueous adhesive for a tennis ball includes rubber latex and a sulfenamide-based vulcanization accelerator. When a solid content in the aqueous adhesive is measured at a temperature of 150° C. by a curelastometer, a 10% torque time t10 is preferably not shorter than 3 minutes and preferably not longer than 15 minutes, and a ratio (t10/t90) of the 10% torque time t10 to a 90% torque time t90 is preferably not less than 0.60 and preferably not greater than 0.95. A tennis ball includes a hollow core obtained by two semi-spherical half cores being adhered by using the aqueous adhesive.

Abstract: A rubber composition for a hollow ball includes a base rubber and an inorganic filler. A weight reduction rate TGA650 from room temperature to 650° C. and a weight reduction rate TGA850 from room temperature to 850° C. of the rubber composition are measured under an air atmosphere by thermogravimetry conforming to JIS K0129. The weight reduction rate TGA650 of the rubber composition is not less than 63% and not greater than 99%. A difference (TGA850?TGA650) between the weight reduction rates TGA850 and TGA650 of the rubber composition is not less than 0% and not greater than 7%. A hollow ball 2 includes a hollow core 4 formed from the rubber composition.

Abstract: A rubber composition for a hollow ball includes a base rubber, an inorganic filler composed of a large number of flat particles, and a carbon-based filler. As to the carbon-based filler, a degree of flatness DLc obtained by dividing an average particle diameter D50c (?m) by an average thickness Tc (?m) is not less than 50. A weight ratio Mc/Mi is not less than 0.01 and not greater than 1.00. The rubber composition is obtained by a production method including: a first step of mixing the base rubber and the carbon-based filler to obtain a master batch; and a second step of adding the large number of flat particles that form the inorganic filler, to the master batch to orient the large number of flat particles. The hollow ball 2 includes a core 4 formed from the rubber composition.

Abstract: An eyepiece lens system for an electronic viewfinder, usable to be disposed on an optical axis between a reflective LCD of the viewfinder and a last optical surface of the viewfinder, the eyepiece lens system comprising: a first lens having a positive refractive index; a second lens having a negative refractive index; and a third lens having a positive refractive index, wherein the first lens, the second lens, and the third lens are disposed in this order from a side of the LCD to a side of the last optical surface, satisfying the conditions: 18 mm<f1<20 mm, ?18 mm<f2<?16 mm, 18 mm<f3<20 mm, 19 mm<f<21 mm, and 0?HH?/f<+0.13 where f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f is a combined focal length of the first to the third lenses, and HH? is distance in an optical axis direction between a rear principal point H and a front principal point H?.

Abstract: A midsole of a shoe has a low elastic part 20, a high elastic part 22 and an inclined surface 24. The low elastic part 20 and the high elastic part 22 include air bubbles. An ethylene-vinyl acetate copolymer (EVA) is used as a base polymer in the low elastic part 20 and the high elastic part 22. The inclined surface 24 is inclined upward from the inside to the outside. The low elastic part 20 is located to the inside of the inclined surface 24. The high elastic part 22 is located to the outside of the inclined surface 24. An inner high elastic part 26 is located to the inside of a low elastic part 20. The thickness of the low elastic part 20 becomes gradually larger from the outside to the inside along the inclined surface 24. The thickness of the high elastic part 22 becomes gradually larger from the inside to the outside along the inclined surface 24. The width Wa of the inclined surface 24 in left and right direction is 5 mm or more and 100 mm or less.

Abstract: An eyepiece lens system for an electronic viewfinder, usable to be disposed on an optical axis between a reflective LCD of the viewfinder and a last optical surface of the viewfinder, the eyepiece lens system comprising: a first lens having a positive refractive index; a second lens having a negative refractive index; and a third lens having a positive refractive index, wherein the first lens, the second lens, and the third lens are disposed in this order from a side of the LCD to a side of the last optical surface, satisfying the conditions: 18 mm<f1<20 mm, ?18 mm<f2<?16 mm, 18 mm<f3<20 mm, 19 mm<f<21 mm, and 0?HH?/f<+0.13 where f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f is a combined focal length of the first to the third lenses, and HH? is distance in an optical axis direction between a rear principal point H and a front principal point H?.

Abstract: In a racket frame, a yoke part is disposed between left and right portions of a bifurcated throat part continuous with a head part and with a shaft part. A ball-hitting face is formed with the yoke part and the head part. The head part and the yoke part have a plurality of string holes formed in penetration therethrough to insert longitudinal and transverse strings therethrough. Longitudinal string holes formed outside left and right sides of the yoke part connected with the left and right portions of the throat part are extended to the throat part to form extended longitudinal string holes open on an outer surface of the throat part.

Abstract: A data transfer system includes a transceiver and a data processing apparatus coupled to the transceiver through a first line, a second line, and a third line. A data transfer method for the data transfer system includes, when data is transferred from the transceiver to the data processing apparatus, transmitting a first trigger signal from the data processing apparatus to the transceiver through the first line, transmitting a first clock signal from the transceiver to the data processing apparatus through the second line in response to the first trigger signal, and transmitting first transfer data from the transceiver to the data processing apparatus through the third line in synchronization with the first clock signal.

Abstract: A racket frame including a yoke part disposed between left and right portions of a throat part continuous with a head part and a shaft part; a string-mounting part, including the yoke part and the head part, which surrounds the ball-hitting face; and string holes formed on the string-mounting part. In this construction, supposing that a total of longitudinal string holes whose axial directions are parallel with a line drawn from an apex of the ball-hitting face to a center of a gripping part and transverse string holes whose axial directions are parallel with a widthwise direction, of the racket frame, which is orthogonal to the axial direction of the racket frame is Ns1 and that a total of all of the string holes is N1, a ratio of Ns1 to N1 is set to not less than 0.70 nor more than 1.0.

Abstract: A tennis racket frame is composed of a laminate of prepregs each containing carbon fibers serving as a reinforcing fiber thereof. At least one part of layers of the laminate is formed as a hard layer consisting of a prepreg composed of the reinforcing carbon fibers and a hard carbon film (DLC film) formed on the surface of the carbon fibers.

Abstract: A midsole of a shoe has a low elastic part 20, a high elastic part 22 and an inclined surface 24. The low elastic part 20 and the high elastic part 22 include air bubbles. An ethylene-vinyl acetate copolymer (EVA) is used as a base polymer in the low elastic part 20 and the high elastic part 22. The inclined surface 24 is inclined upward from the inside to the outside. The low elastic part 20 is located to the inside of the inclined surface 24. The high elastic part 22 is located to the outside of the inclined surface 24. An inner high elastic part 26 is located to the inside of a low elastic part 20. The thickness of the low elastic part 20 becomes gradually larger from the outside to the inside along the inclined surface 24. The thickness of the high elastic part 22 becomes gradually larger from the inside to the outside along the inclined surface 24. The width Wa of the inclined surface 24 in left and right direction is 5 mm or more and 100 mm or less.