Abstract: To obtain a fuel cell bipolar plate of high quality and high productivity with less deformation, warpage, and cracking at the time of product removal from a die by making equal the density balance between a gas flow passage groove part area and a surrounding part area on the surface of the bipolar plate. A (upper) lower inner die (42,) 22 is positioned at a prescribed height (under or) above a (upper) lower outer die (45,) 25 so that the compression ratio of a flow passage groove part 2 and the compression ratio of a surrounding part 4 are equal when a cavity 50 formed between upper and lower dies 41 and 21 divided into the upper and lower inner dies 42 and 22 corresponding to the flow passage groove part 2 and the upper and lower outer dies 45 and 25 corresponding to a surrounding part 4, respectively, is filled with a powder-like material.

Abstract: To extend the service life of a latch of a plug housing and facilitate assembly and aligning operations of an optical connector. The optical connector includes a latch provided in a cantilever form on an external surface of the optical connector and deformable for attachment/detachment with respect to an adaptor, and an excessive deformation preventing unit that prevents excessive deformation of the latch.

Abstract: To provide a fusion-spliced optical connector capable of easily performing a fusion-splicing operation at an actual site in a short time, without need to perform additional special operations. An optical connector component is configured to attach a short-length optical fiber to a ferrule including a capillary and a flange. The capillary comprises a minute through hole and a coated-portion storage hole formed in the capillary, the minute through hole to be stored therein the bare optical fiber portion of the short-length optical fiber and the coated-portion storage hole to be stored therein a part of a coated optical fiber portion of the short-length optical fiber continuous to the bare optical fiber portion. The flange includes a coated-portion penetrating hole formed in the flange to be penetrated therein a very short portion continuous to the part of the coated optical fiber portion stored in the coated-portion storage hole.

Abstract: To provide an optical connector kit in which all connector parts contained in a containing case, wherein said connector parts includes a ferrule equipped with an optical fiber employed, in which a short length optical fiber is fixed to the ferrule and the ferrule is subjected to polishing at the terminal end thereof in advance. The optical connector kit, wherein said kit comprises a ferrule with an optical fiber comprising a short length optical fiber which has been fixed to the ferrule in advance, in which the ferrule is subjected to polishing treatment at the terminal surface thereof; a plurality of connector parts which are passed through said optical fiber before the rear end of said short length optical fiber and the front end of another optical fiber are subjected to fusion splice each other; and a containing case for receiving all connector parts constructing an optical connector including said ferrule with the optical fiber and said passing parts.

Abstract: A connecting end face cleaning tool having superior cleaning properties includes a cleaning fabric. This cleaning tool removes soiling attached to the connecting end face of an optical connecting part when that connecting end face is detached. The cleaning fabric is constructed such that the woof threads protrude from the surface of the fabric more than the warp threads. The cleaning fabric has a tape-like shape, the lengthwise direction of which is the direction of the extension of the warp threads. Soiling is removed from a connecting end face as the connecting end face and cleaning fabric are moved relatively such that the connecting end face moves transverse to the woof threads of the cleaning fabric. A method of cleaning a connecting end face uses a cleaning fabric with woof threads protruding from the surface of the fabric more than the warp threads and the fabric is moved relative to the connecting end face transverse to the woof threads of the fabric.

Abstract: An optical connector kit as described below is provided. An inserting operation of an optical fiber to be inserted into a plurality of connector parts is facilitated. All connector parts constituting an optical connector are accommodated, including a ferrule. To the ferrule, an optical fiber having a predetermined length is attached and has been subjected to end face polishing processing. The optical connector kit includes a ferrule-with-optical-fiber and an accommodating housing for accommodating all connector parts constituting an optical connector, including a ferrule-with-optical-fiber. An optical fiber having a predetermined length is attached in advance to the ferrule of the ferrule-with-optical-fiber and the end face polishing processing is carried out. The connector parts include a plurality of connector parts into which another optical fiber is inserted when the rear end of the optical fiber of the ferrule-with-optical-fiber and the tip end of another optical fiber are fusion-spliced.

Abstract: To extend the service life of a latch of a plug housing and facilitate assembly and aligning operations of an optical connector. The optical connector includes a latch provided in a cantilever form on an external surface of the optical connector and deformable for attachment/detachment with respect to an adaptor, and an excessive deformation preventing unit that prevents excessive deformation of the latch.

Abstract: The present invention provides a high-density and high-precision optical fiber array which can stably be manufactured with excellent operability and which can maintain excellent characteristics while suppressing insertion loss with respect to optical parts by optimizing constituent parts of the high-density optical fiber array. The present invention also provides a manufacturing method of the optical fiber array. According to the optical fiber array, a plurality of V-grooves are formed in a V-groove substrate in parallel to each other. A plurality of optical fibers whose end coatings are removed are aligned in the V-grooves. The optical fibers are fixed, using an adhesive, between the V-groove substrate and a lid plate to be placed on the optical fibers. In the optical fiber array, an average value of pitches of the V-grooves is substantially equal to an average value of outer diameters of the optical fibers. A radius of curvature of fiber curl of each optical fiber is 8 meters or more.

Abstract: There is provided a holder for an optical fiber ferrule end face grinding apparatus that can make good use of a grinding film, in which the number of optical fiber ferrules held by the holder is greatly increased. The holder includes a holder plate including a plurality of insertion holes into which each of the ferrules is inserted. In the holder plate, the insertion holes are arranged in an area of a certain size extending from the center to the periphery thereof.

Abstract: To provide a fusion-spliced optical connector capable of easily performing a fusion-splicing operation at an actual site in a short time, without need to perform additional special operations. An optical connector component is configured to attach a short-length optical fiber to a ferrule including a capillary and a flange. The capillary comprises a minute through hole and a coated-portion storage hole formed in the capillary, the minute through hole to be stored therein the bare optical fiber portion of the short-length optical fiber and the coated-portion storage hole to be stored therein a part of a coated optical fiber portion of the short-length optical fiber continuous to the bare optical fiber portion. The flange includes a coated-portion penetrating hole formed in the flange to be penetrated therein a very short portion continuous to the part of the coated optical fiber portion stored in the coated-portion storage hole.

Abstract: An object is to provide a disc-molding mold which can increase the degree of transfer of a pattern of a stamper to thereby improve quality of molded products, as well as a molded product and a molding machine. In the vicinity of the outer peripheral edges of first and second disc-shaped members, the cooling capacity of the medium flow passage of the stamper-side disc-shaped member is made lower than the cooling capacity of the medium flow passage of the non-stamper-side disc-shaped member. On the stamper side, the quantity of heat radiated from the outer peripheral edge of the stamper-side disc-shaped member to the outside of the disc-molding mold can be reduced, whereby over-cooling of the stamper-side disc-shaped member can be prevented.

Abstract: To cause uniform infiltration in a thermoplastic resin surface in a short time using a small amount of a surface reforming material. A surface reforming method of a thermoplastic resin includes a step of opening a movable mold after a thermoplastic resin is molded in a cavity to form a gap between a portion of a molded product and a stationary mold, a step of introducing supercritical fluid, subcritical fluid, or high pressure gas including a surface reforming material into the gap, a step of narrowing the gap by closing the movable mold by a predetermined amount to prevent leaking of the introduced supercritical fluid, subcritical fluid, or high pressure gas from the gap, and of charging the supercritical fluid, the subcritical fluid, or the high pressure gas into a narrowed second gap, and a step of clamping and compressing the molded product.

Abstract: The present invention provides an injection molding method capable of impregnating a supercritical fluid stably and partially in molten resin in a plasticizing cylinder of an injection molding apparatus. The above object is achieved by providing the method of injection molding which includes measuring a filling amount of the molten resin in the plasticizing cylinder, introducing a supercritical fluid into the molten resin in the plasticizing cylinder while moving back the screw by a predetermined distance without rotating the screw from a position of the screw at the time of completing the measuring, detecting a pressure of the molten resin, and determining based on the pressure an injection start position for the screw.

Abstract: A thermo optical type variable optical attenuator suitable for application in an array type variable optical attenuator that realizes low crosstalk between neighboring waveguides in the array is provided. A thermo optical type variable optical attenuator 100 using optical material having negative optical effect provides a multimode optical propagating part 3 disposed via a tapered part 2 and a tapered part 7 between single mode optical waveguides 1 and 8. A thin-film heater 4 is disposed above the multimode optical propagating part 3 at an angle of inclination ? in relation to the direction of light propagation along a first optical waveguide 50. Moreover, a second optical waveguide 9 optically coupled with a side face 3S1 of the multimode optical propagating part 3 is provided at an angle of inclination 2? in relation to the direction of light propagation along the first optical waveguide 50.

Abstract: An optical connector plug adapted to be freely and readily attached to or detached from either an SC or an FC connector adapter comprising a housing that couples to the adapter and attaches the plug to the adapter, a plug frame disposed within the housing, which plug frame supports a ferrule secured to one end of an optical fiber and a flange secured around the outside of the ferrule such that the ferrule and the flange can rotate around the axial center of the ferrule, and a plug holder, disposed inside the housing, for positioning the ferrule in relation to the housing by non-incrementally rotating the ferrule to any determinable angle in relation thereto, the plug holder having a coupling part that couples to a groove formed in the flange and is capable of rotating in relation to the plug frame around the center axis of the ferrule.

Abstract: An optical fiber connector cleaner (1) comprises a housing (10), a winding means (32) and a delivery means (34) for a cleaning tape (T) which are disposed in the housing, a cleaning means (20) having a bar-like cleaning section (21) projecting outwardly of the housing, on the front-end of the cleaning section the cleaning tape delivered from the delivery means being movably mounted under tension in an exposed state, the front-end of the cleaning section being brought into contact with the end surface of an optical fiber connector to thereby clean the end surface, a cleaning section rotating means (23) coaxially connected to the cleaning section in the housing and rotatably supported with respect to the housing; and a transmission means (40) which rotates the winding means and the cleaning section rotating means substantially simultaneously in a predetermined direction through a predetermined angle and then reverses the cleaning section rotating means to its original position.

Abstract: An end face polishing apparatus has a jig plate for supporting at least one workpiece having an end face and a polishing plate mounted for undergoing movement. A polishing member is mounted on the polishing plate for undergoing movement therewith to polish the end face of the workpiece. A slidable contact member is disposed on the jig plate for slidable contact with the polishing plate during a polishing operation to thereby regulate a polishing amount of the end face of the workpiece.

Abstract: An end face polishing apparatus with improved polishing precision regardless of the length of ferrules when end faces of the ferrules are polished is provided. In an end face polishing apparatus polishing a rod-shaped member mounted at a polishing fixture by pressing the rod-shaped member against a lapping member on a lapping machine provided on a surface plate that is supported at the main body of the apparatus to rotate and rock, there are a plurality of rod-shaped guide members provided at the polishing fixture radially outwardly projecting and a tubular member capable of supporting the polishing fixture through the guide members on the surface plate. In this way, the guide members at the polishing fixture and the tubular member abut against each other so that the movement of the polishing fixture in the pressing direction is restricted.