Abstract: A method for producing a rubber wet masterbatch, the method including: adding a rubber latex solution to a carbon black-containing slurry aqueous solution in which a carbon black is dispersed in water and mixing the solutions to produce a carbon black-containing rubber latex aqueous solution; coagulating the carbon black-containing rubber latex aqueous solution obtained to produce a carbon black-containing rubber coagulum; cleaning the carbon black-containing rubber coagulum obtained to produce a cleaned carbon black-containing rubber coagulum; and dehydrating and drying the cleaned carbon black-containing rubber coagulum obtained to produce a rubber wet masterbatch, wherein an amount of an acetone extract from the cleaned carbon black-containing rubber coagulum is 2% by mass or less after drying the coagulum at 23° C. for 24 hours and further at 90° C. for 2 hours. Vulcanized rubber having excellent low exothermicity and excellent abrasion resistance can be obtained by the method.

Abstract: A masterbatch manufacturing method comprises an operation in which at least a filler slurry and a natural rubber latex are mixed to prepare a liquid mixture, and an operation in which a coagulant is added to the liquid mixture so as to cause pH to be not less than 5.0 but less than 8.0.

Abstract: A masterbatch manufacturing method in accordance with the present disclosure comprises an operation in which pre-coagulation rubber latex comprising filler is coagulated to obtain a coagulum; an operation in which the coagulum is dewatered; and an operation in which the dewatered coagulum is plasticized as it is dried by means of an extruder; wherein, during the operation in which the dewatered coagulum is plasticized as it is dried, the coagulum comprises a peptizing agent.

Abstract: A method for producing a rubber wet masterbatch, the method including: adding a rubber latex solution to a carbon black-containing slurry aqueous solution in which a carbon black is dispersed in water and mixing the solutions to produce a carbon black-containing rubber latex aqueous solution; coagulating the carbon black-containing rubber latex aqueous solution obtained to produce a carbon black-containing rubber coagulum; cleaning the carbon black-containing rubber coagulum obtained to produce a cleaned carbon black-containing rubber coagulum; and dehydrating and drying the cleaned carbon black-containing rubber coagulum obtained to produce a rubber wet masterbatch, wherein an amount of an acetone extract from the cleaned carbon black-containing rubber coagulum is 2% by mass or less after drying the coagulum at 23° C. for 24 hours and further at 90° C. for 2 hours. Vulcanized rubber having excellent low exothermicity and excellent abrasion resistance can be obtained by the method.

Abstract: A masterbatch manufacturing method in accordance with the present disclosure comprises an operation in which pre-coagulation rubber latex comprising filler is coagulated to obtain a coagulum; an operation in which the coagulum is dewatered; and an operation in which the dewatered coagulum is plasticized as it is dried by means of an extruder; wherein, during the operation in which the dewatered coagulum is plasticized as it is dried, the coagulum comprises a peptizing agent.

Abstract: A method for producing a rubber wet masterbatch is disclosed including mixing a carbon-black-containing aqueous-slurry-solution in which a carbon black is dispersed in water with a rubber latex solution to produce a carbon-black-containing aqueous-rubber-latex-solution, solidifying the resultant carbon-black-containing aqueous-rubber-latex-solution to produce a carbon-black-containing rubber solidified product, and dehydrating and drying the resultant carbon-black-containing rubber solidified product to produce a rubber wet masterbatch. In this method, about the carbon-black-containing aqueous-slurry-solution, in carbon black particles in the slurry-solution, the proportion of carbon black particles having a particle diameter of 60 ?m or more is 35% or less by volume. The particle diameter is based on a measurement of the carbon black particles in the slurry-solution with an image-analytic particle size distribution meter.

Abstract: A masterbatch manufacturing method is disclosed in which carbon black is added to a liquid and this is agitated to obtain a carbon black slurry; the carbon black slurry and rubber latex are mixed to obtain pre-coagulation rubber latex; and the pre-coagulation rubber latex is coagulated; wherein, at the operation in which the carbon black slurry is obtained, dispersion time from the start of agitation to the end of agitation is not less than 5 times, but not greater than 40 times. A particle diameter reduction relaxation time v may be found by plotting measurement results on a planar graph in such fashion that elapsed time t (minutes) since the start of agitation is plotted on the horizontal axis, and particle diameter f (?m) of carbon black is plotted on the vertical axis, to obtain a best-fit solution.

Abstract: A masterbatch manufacturing method is disclosed in which carbon black is added to a liquid and this is agitated to obtain a carbon black slurry; the carbon black slurry and rubber latex are mixed to obtain pre-coagulation rubber latex; and the pre-coagulation rubber latex is coagulated; wherein, at the operation in which the carbon black slurry is obtained, dispersion time from the start of agitation to the end of agitation is not less than 5 times, but not greater than 40 times. A particle diameter reduction relaxation time v may be found by plotting measurement results on a planar graph in such fashion that elapsed time t (minutes) since the start of agitation is plotted on the horizontal axis, and particle diameter f (?m) of carbon black is plotted on the vertical axis, to obtain a best-fit solution.

Abstract: It is an object of the present invention to accurately maintain a positional relationship between a lens held in a holding member and an optical fiber without requiring any complicated operation. The invention includes a holder (11), at one end of which a housing section (11c) that houses a ball lens (12) is formed and at the other end of which an insertion hole (11a) for inserting an optical fiber (13) is formed, and a magnet (14) provided outside in a direction crossing a housing direction of the ball lens at the one end of the holder, in which the magnet generates an attracting force for aligning a center of the ball lens with a center of an optical element provided in a coupling target.

Abstract: A problem which is addressed is the provision of a method for manufacturing a wet rubber masterbatch and so forth permitting improvement in fatigue resistance without causing worsening in ability to achieve reduced heat generation. Wet rubber masterbatch and so forth are manufactured by means of a method comprising an operation in which a latex that comprises rubber particles for which 90 vol % particle diameter is not greater than 2 ?m and that has magnesium present therein in an amount which is not greater than 150 ppm is prepared.

Abstract: It is an object of the present invention to accurately maintain a positional relationship between a lens held in a holding member and an optical fiber without requiring any complicated operation. The invention includes a holder (11), at one end of which a housing section (11c) that houses a ball lens (12) is formed and at the other end of which an insertion hole (11a) for inserting an optical fiber (13) is formed, and a magnet (14) provided outside in a direction crossing a housing direction of the ball lens at the one end of the holder, in which the magnet generates an attracting force for aligning a center of the ball lens with a center of an optical element provided in a coupling target.

Abstract: An optical connector is characterized by having an optical coupling member (10) provided with a holder (11) where a storage portion to store a ball lens (12) is formed at one end, and an insertion hole to insert an optical fiber (13) is formed at the other end, and a magnet (14) which is provided outside in a direction crossing a storage direction of the ball lens at one end of the holder, and generates an adsorption force to align the center of the ball lens with the center of an optical element provided in a coupling target, a guide member (2) which regulates a shift of the optical coupling member, while permitting alignment operation of the optical coupling member with the coupling target, and a case (4) in which is formed storage space (4a) with an opening, and which is provided with a second adsorption member (15) for generating an adsorption force to an end face on the coupling target side.

Abstract: The present invention provides an optical coupling member and an optical connector using the optical coupling member, capable of improving the efficiency of an assembly work of the optical connector and positioning optical fibers in the optical connector with high accuracy. The optical coupling member (10) has: holding members (11) for being able to hold optical fibers (21) that are inserted from insertion holes (11a) formed at end parts; lenses housed in housing parts formed at opposite end parts of the holding members (11); and a joining member (13) for connecting the holding members (11) as aligned in parallel to each other, the joining member being formed of an elastic material.

Abstract: The present invention provides an optical coupling member and an optical connector using the optical coupling member, capable of improving the efficiency of an assembly work of the optical connector and positioning optical fibers in the optical connector with high accuracy. The optical coupling member (10) has: holding members (11) for being able to hold optical fibers (21) that are inserted from insertion holes (11a) formed at end parts; lenses housed in housing parts formed at opposite end parts of the holding members (11); and a joining member (13) for connecting the holding members (11) as aligned in parallel to each other, the joining member being formed of an elastic material.

Abstract: To detect a position on a screen with which even a thin nib is in contact, and improve operativity, visibility at the time of operation, and a feeling of use. A touch screen film 5 includes at least a transparent, conductive, thin film 7 which has a predetermined surface resistivity set to be within a range from 105.0 to 108.0 ?/sq; when a pointing means 30 comes into contact with the film, a change in capacitance per unit area of 0.36 to 6.00 pF/mm2 occurs in a dielectric material 4 between a predetermined area including the contact position and the sensor electrode.

Abstract: In order to fix an optical fiber to a desired position in a holding member easily and tightly, provided is an optical collimator (10) having a plastic optical fiber (13) and a cylindrical holder (11). The holder (11) is configured to hold a collimator lens (12) at an end and has an insertion hole (11a) at an opposite end for inserting the plastic optical fiber (13). The plastic optical fiber (13) is sandwiched by an inner surface of a recess (11e) which is formed at a part of the holder (11) in proper alignment with the collimator lens (12).

Abstract: In order to position lenses and an optical fiber highly accurately while relaxing the assembly accuracy requirements, the present invention provides an optical coupling member having an optical fiber, a holding member that has an insertion hole formed at an end thereof for holding the optical fiber inserted via the insertion hole, and a plurality of ball lenses housed along an optical axis in a housing part formed at an opposite end of the holding member. The ball lenses are arranged in contact with each other and the optical fiber is arranged in contact with the ball lens that faces the optical fiber.

Abstract: A speaker unit is realized which directly drives a vibration plate having a low density, light weight, yet sufficient rigidity with a digital audio signal, and can thereby transmit vibration of a voice coil thereof to a carbonaceous acoustic vibration plate without loss. The present invention provides a digital speaker unit including a speaker body (14) comprising a carbonaceous acoustic vibration plate (25), a delta-sigma modulator (11) and a thermometer code conversion section (12) that convert a multi-value bit digital audio signal supplied from a digital sound source (10) to a digital signal with required bits, a plurality of voice coils (24) that cause to vibrate a plurality of the carbonaceous acoustic vibration plates (25) provided in accordance with the number of digital signal bits and a driver circuit (13) that individually drives each voice coil (24) based on the digital signal.

Abstract: A carbonaceous acoustic diaphragm whose density is reduced while retaining the required stiffness is provided. Carbon nanofibers and spherical particles of PMMA are mixed into a carbon-containing resin such as a polyvinyl chloride resin, and the mixture is carbonized to vaporize the spherical particles of PMMA, thereby forming a porous structure having pores with the carbon nanofibers in a powdered form uniformly dispersed through amorphous carbon. By forming a multilayer structure by combining the porous layer with a layer that does not use PMMA, the density can be further reduced while retaining the stiffness.

Abstract: In order to fix an optical fiber to a desired position in a holding member easily and tightly, provided is an optical collimator (10) having a plastic optical fiber (13) and a cylindrical holder (11). The holder (11) is configured to hold a collimator lens (12) at an end and has an insertion hole (11a) at an opposite end for inserting the plastic optical fiber (13). The plastic optical fiber (13) is sandwiched by an inner surface of a recess (11e) which is formed at a part of the holder (11) in proper alignment with the collimator lens (12).