Abstract: A ferrule heating apparatus 1, which is configured to heat a ferrule and thereby adhere an optical fiber and the ferrule together, includes a plurality of ferrule housing portions capable of freely housing and aligning ferrules 27, a holder 5 made of a thermally conductive member, a holder heating unit 9 for supporting and heating the holder 5, and a temperature control unit 11 for controlling a temperature of the holder heating unit 9. The holder heating unit 9 and the temperature control unit 11 are provided mutually separately. Meanwhile, the holder heating unit 9 and the temperature unit 11 are mutually connected to each other through an electric power cable 13.

Abstract: An object of the present invention is to provide a mold for molding, a molding method, and a molding machine in which generation of burrs on a disc substrate can be prevented to thereby enhance quality of the disc substrate, as well as a disc substrate molded by the same. The mold for molding includes a mirror-surface disc (16); a stamper (29) having a hole formed at its center, and attached to the front end surface of the mirror-surface disc (16); and an inner holder (60) for holding the stamper (29) by means of press fit into the hole. In the course of the press fit, at least either the stamper (29) or the inner holder (60) is subjected to stress in excess of its yield point and plastically deformed. In this case, the inner holder (60) is press-fitted into the hole of the stamper (29) to thereby hold the stamper (29), thereby eliminating need to form a holding portion at the outer circumferential edge of the front end of the inner holder (60).

Abstract: An end face polishing method provides an end face polishing apparatus having a main body, a jig board mounted on the main body and supporting at least one workpiece, a polishing board mounted on the main body for undergoing rotational and revolving movements relative to the main body, and abrasive members each removably connectable to the polishing board for rotational and revolving movements therewith. Each of the abrasive members has an abrasive surface with a hardness that is either higher or lower than the hardness of the abrasive surface of the others of the abrasive members. An end face of a workpiece is successively brought into pressure contact with the abrasive surface of each of the abrasive members in descending order of hardness of the abrasive surfaces while rotating and revolving the polishing board to thereby successively polish the end face of the workpiece.

Abstract: A holder for an optical fiber ferrule end face grinding apparatus is provided which can grind an increased number of optical fiber ferrules simultaneously. The holder comprises a holder plate provided with a plurality of ferrule insertion holes, a seat extending to at least one insertion hole and having a first wall, and a second wall on a side of the insertion hole opposing the seat. A slidable holding member including a front face facing the second wall, and an inclined rear face is disposed on the seat. A depression member is mounted on the holder plate that presses downwardly on a rod member disposed on the inclined rear face. As the depression member is operated, the rod member is pressed downwardly along the first wall, and the holding member is pushed forward such that a ferrule is clamped between the front face and the second wall.

Abstract: An injection molding method that modifies a surface of thermoplastic resin using a supercritical fluid that contains a solute, and molds the thermoplastic resin, includes the steps of injecting the thermoplastic resin into a mold cavity in a mold, a space being formed between the mold cavity and the surface of the thermoplastic resin, introducing into the space the supercritical fluid that contains the solute, and exhausting from the space the supercritical fluid that contains the solute.

Abstract: An optical fiber assembly having a hermetic seal portion includes a optical fiber assembly and a metal pipe. The optical fiber assembly includes a metallized portion where a portion exposed by peeling off a resin coating of the optical fiber assembly is coated with metal. The metal pipe includes a feedthrough hole, an uncovered portion, a brazed portion and an adhesive-fixed portion. The feedthrough hole has a length necessary to cover a part of the metallized portion and a part of the coated portion leading to one end of the metallized portion. The uncovered portion has a housing groove leading to the feedthrough hole and contains a remainder of the metallized portion and a part of the coated portion leading to the other end of the metallized portion. The brazed portion hermetically seals the optical fiber assembly to the metal pipe by brazing the metallized portion and the inner surface of the feedthrough hole near a slanted upward opening of the feedthrough hole on the housing groove side.

Abstract: In an optical fiber ferrule assembly, a bare optical fiber, an end coating of which is removed, is inserted and fixed into the central hole of a ferrule body. By setting the distance between a boundary point at which the bare optical fiber is fixed at the rear end of the ferrule body and a next point at which the bare optical fiber is fixed to a fixing member which is formed integrally with the ferrule body via a coating of an optical fiber core to the range of 0.5 to 6 mm, more preferably, to the range of 1 to 4 mm, stress concentration at the boundary point at which the bare optical fiber is bonded and the point at which the optical fiber core is fixed cab be reduced.

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: In an optical fiber ferrule assembly, a bare optical fiber, an end coating of which is removed, is inserted and fixed into the central hole of a ferrule body. By setting the distance between a boundary point at which the bare optical fiber is fixed at the rear end of the ferrule body and a next point at which the bare optical fiber is fixed to a fixing member which is formed integrally with the ferrule body via a coating of an optical fiber core to the range of 0.5 to 6 mm, more preferably, to the range of 1 to 4 mm, stress concentration at the boundary point at which the bare optical fiber is bonded and the point at which the optical fiber core is fixed cab be reduced.

Abstract: An optical connector end face grinding apparatus comprises a grinding apparatus main body, a sliding plate and a grinding bolder. The grinding apparatus main body further comprises an eccentric member driven by a motor and a guide pin. The sliding plate further provides a grinding pad on which is disposed a grinding film and moves in a reciprocal action along a guide pin in synchronism with the circular movement of the rotation of the eccentric member. An optical connector with a ferrule can be attached to and detached from the grinding holder, which positions the end face of the ferrule in a predetermined position relative to the grinding film in the rotational center of the eccentric member.

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: The center of a turntable 30 moves around the central axial line of an autoroation disk 20 along the circular orbit C of a smaller diameter than that of an autorotation disk 20. Thus, the turntable 30 revolves both around a center point O and on its own axis in accordance with an autorotation of the autorotation disk 20. A polishing holder 60 holds a connector of an optical fiber polished by a polishing film 41 arranged on the upper plane of the turntable 30. An optical fiber end face polishing machine provided with a memory 85 for storing a control program which allows a control device 80 to execute predetermined polishing steps, the control device 80 being for controlling an autorotation motor 16 of the turntable 30 and a revolution motor 14 thereof.

Abstract: An optical attenuator includes a holding sleeve, a pair of ferrules inserted into and fixed to the holding sleeve such that the ferrules oppose each other at base ends thereof at a predetermined distance between each base end, and an attenuating fiber inserted into and fixed to the pair of ferrules such that ends of the attenuating fiber are exposed. The optical attenuator is also provided with an opening in the holding sleeve so as to communicate with the outside. A filler is supplied into the sleeve through the opening.

Abstract: A light-signal delaying device according to the present invention includes a linear guide rail and a pair of stages mounted on the linear guide rail. The device further includes a V-groove holder mounted on one of the stages, a pair of optical fiber collimators secured to the V-groove holder, a pair of reflecting mirrors mounted on the other stage such that reflecting surfaces thereof meet each other at 90°, and an actuator engaging section for moving the stage along the linear guide rail.

Abstract: A holder for an optical fiber ferrule end face grinding apparatus is provided which can grind an increased number of optical fiber ferrules simultaneously. The bolder comprises a holder plate provided with a plurality of ferrule insertion holes, a seat extending to at least one insertion hole and having a first wall, and a second wall on a side of the insertion hole opposing the seat. A slidable holding member including a front face facing the second wall, and an inclined rear face is disposed on the seat. A depression member is mounted on the holder plate that presses downwardly on a rod member disposed on the inclined rear face. As the depression member is operated, the rod member is pressed downwardly along the first wall, and the holding member is pushed forward such that a ferrule is clamped between the front face and the second wall.