Abstract: An optical functioning component in which strength is maintained while miniaturization is achieved and a number of parts can be decreased to reduce a cost is provided. In an optical functioning component including an attenuation ferrule provided on its front end side and having an attenuation mechanism, an optical connection sleeve for holding a rear end of the ferrule, a frame for holding the ferrule and the optical connection sleeve and a housing for holding the frame so that the frame can move axially and freely by a predetermined amount, a front end side of the housing has a roughly equal shape to a front end of a plug housing of an optical connector-plug connectable to an optical connector-adaptor engaged with the former front end side, and a rear end of the housing has a shape that the optical connector-plug with the plug housing removed can engage.

Abstract: Provided is a PC connector to be removed of useless stress during attached/detached thus being stably attached/detached. A flange part is provided in a polygonal or disk form circumferentially projecting on the flange member at a tip side thereof. In a holding part holding the flange member, an engaging part is formed axially of the optical fiber and in a predetermined engaging width. The flange part has a predetermined clearance to the engaging part at an axial tip side thereof. A rotation positioning part restricts a movement in rotational direction of the flange part. A rotation allowing part is provided to form, on a rear-end side of the rotation positioning part, a clearance greater than the clearance of between the rotation positioning part and the engaging part.

Abstract: An end face polishing method that can improve polishing accuracy of an end face of a ferrule and increase return loss in opposite connection is to be provided. In the end face polishing method in which the end face of a rod shape member is polished by pressing the rod shape member attached to a jig board to an abrasive member on a polishing board which is supported by a main body of an apparatus to be rotated and oscillated, by using the plurality of abrasive members whose hardnesses are higher than the rod shape member and different from the rod shape member, the end face of the rod shape member is polished with the abrasive members in a manner that the abrasive member is exchanged in the order from that of higher hardness to that of lower hardness.

Abstract: A ferrule has a cylindrical body for the ferrule which is constructed by ceramic and has an optical fiber insertion hole for inserting an optical fiber thereinto and also has an optical buffered fiber insertion hole communicated with the optical fiber insertion hole and inserting and holding an optical buffered fiber formed by coating the optical fiber; and a flange member fixed to only the outer circumferential face of the cylindrical body for the ferrule. Thus, the ferrule is constructed by the cylindrical body for the ferrule and the flange member fixed to only the outer circumferential face of the cylindrical body for the ferrule. Accordingly, the flange member can be made light in weight and manufacture cost can be reduced.

Abstract: An optical fiber connector assembly has a holding member and a housing having a cavity for receiving the holding member. The holding member has a first surface, a second surface, grooves formed in the first surface for holding respective ferrules each supporting an optical fiber element, and through-holes for respectively receiving therethrough the optical fiber elements and for communicating the grooves with the second surface. The housing has a base surface, through-holes extending through the base surface, and side surfaces defining with the base surface a cavity for receiving the holding member so that the through-holes of the holding member are communicated with the through-holes of the housing for receiving therethrough the optical fiber elements.

Abstract: A polishing system capable of producing and controlling a plurality of types of rod-shaped members is provided. The polishing system has a control machine capable of inputting and indicating pressure processing conditions having actual pressure measurements. The control machine includes a numbers indication part for indicating the number of the rod-shaped members, a type indication part for indicating connector types, a type indication part for indicating ferrule types, a process indication part for indicating a plurality of steps, and programmed pressure for inputting and indicating programmed pressure.

Abstract: A universal optical connector adapter that can be used to connect optical connector plugs of the same or different types having ferrules fixed at ends of optical fibers. The universal adapter has first and second housings each having at one end a coupling portion for detachably coupling with an optical connector plug of a given type and on an opposite end a base plate having a reference plane. A cylindrical coupling member is rotatably held inward of the coupling portion of the first housing and incorporates a sleeve for fitting ferrules into opposite sides thereof. A male thread is provided on an outer periphery of the coupling cylindrical member and a female thread is provided in the coupling portion of the second housing on a side opposite to that in which an optical connector plug is coupled. The female thread is removably couplable with the male thread.

Abstract: An optical connector adapter has an optical connection sleeve having a first end portion and a second end portion opposite the first end portion. A sleeve holder has a first cylindrical member having a first through-hole receiving the first end portion of the optical connection sleeve. The sleeve holder is disposed in a tubular housing which has a second cylindrical member having a second through-hole receiving the second end portion of the optical connection sleeve. Engagement members engage the sleeve holder and the housing together in a state that a first end of the first cylindrical member and a first end of the second cylindrical member are abutted against each other. Engagement convex portions project radially inward at respective second ends of the first cylindrical member and the second cylindrical member for regulating movement of the optical connection sleeve in an axial direction.

Abstract: An optical fiber connector for connecting an optical fiber cable to a ferrule comprises a tubular body having a first end portion for connection to a peripheral surface of a ferrule, a second end portion for connection to a peripheral surface of an optical fiber cable, a step portion interconnecting the first end portion to the second end portion, and a clamping portion for clamping the optical fiber cable to the ferrule. The clamping portion extends inwardly from a terminal end of the second end portion towards the central axis of the tubular body but does not project lengthwise from the terminal end of the second end portion in the direction of the central axis. The first end portion, the second end portion, the step portion and the clamping portion of the tubular body have approximately the same wall thickness.

Abstract: A ferrule for use in an optical connector enabling effective suppression of the increase in the insertion loss resulting from repeated attachments/detachments of the optical connector. In the ferrule for use in the optical connector, a plurality of grooves 17 are formed in a fitting surface 16A of a ferrule main body 11 located between the ferrule main body 11 and a connection sleeve SL. And, a ferrule 2 for use in an optical connector, a plurality of concentric annular grooves 27 are formed in a connection end surface 24 of the ferrule main body 21 having a connection end 22A of the optical fiber 22 exposed thereon.

Abstract: A clamp ring for connecting a tensile strength member to the periphery of a rear end portion of a ferrule retaining part for holding a ferrule, in which an optical fiber of an optical fiber cable incorporating a coated optical fiber and the tensile strength member surrounding the coated optical fiber is inserted and fixed with an outer covering of the optical fiber cable stripped off from its terminal portion, the clamp ring comprising a first annular portion which fits on the periphery of the rear end portion of the ferrule retaining part, a second annular portion located in the back of the first annular portion, the second annular portion having a smaller diameter than the first annular portion, a step portion interconnecting the second annular portion and the first annular portion, and a clamping portion extending inward from the rear end of the second annular portion in such a way that the extreme end of the clamping portion secures the periphery of the optical fiber cable, in which the first annular port

Abstract: An end face polishing apparatus is provided in which polishing accuracy is improved, regardless of the length of the ferrule when polishing the end face of the ferrule. The end face polishing apparatus in which a rod-shaped member mounted on a jig plate by a polishing member mounted on the polishing plate which is rotatably and swingably supported to the apparatus body is pressed to be polished; in which the jig plate is provided on either the jig plate or the polishing plate, and the other is slidably contacted by a slidable contact member, and is supported in a state where rotation is regulated on the polishing plate.

Abstract: Universal optical fiber connectors and their basic plugs, wherein the optical fiber connectors have some common elements for their connector-functions to permit an installation of optical fiber into one of the different type connectors for establishing their connection more easily and to facilitate a tuning operation with positioning key maintaning the same direction between eccentricity of the fiber core and the key. The basic plug has a ferrule, a spring element, and a cylindrical tube. The spring element is positioned between a ferrule and a cylindrical tube, so that it exerts forces toward them in an axial direction. The ferrule has a common dimensional structure for securing an optical fiber and has a shape enabling the connection to any one of various kinds of housing members. Thus, the basic plug connects separate optical fibers together through the housing member.

Abstract: A universal optical fiber connector comprises a ferrule for supporting an optical fiber and having an axis extending in an axial direction of the ferrule, a biasing member comprised of a synthetic elastic material for biasing the ferrule in the axial direction, and a securing member for securing the biasing member between the securing member and the ferrule. A connecting member is adapted to receive the ferrule for connection to another ferrule through the connecting member.

Abstract: Universal optical fiber connectors and their basic plugs, wherein the optical fiber connectors have some common elements for their connector-functions to permit an installation of optical fiber into one of the different type connectors for establishing their connection more easily and to facilitate a tuning operation with positioning key maintaining the same direction between eccentricity of the fiber core and the key. The basic plug has a ferrule, a spring element, and a cylindrical tube. The spring element is positioned between a ferrule and a cylindrical tube, so that it exerts forces toward them in an axial direction. The ferrule has a common dimensional structure for securing an optical fiber and has a shape enabling the connection to any one of various kinds of housing members. Thus, the basic plug connects separate optical fibers together through the housing member.

Abstract: In a method of grinding a ferrule, a ferrule is provided having a leading end portion having a surface disposed generally perpendicular to a longitudinal axis of the ferrule. A grinding device is provided having a rotational base, an elastic member disposed on the base for rotation therewith, and a grinding sheet disposed on the elastic member for rotation therewith. The surface of the leading end portion of the ferrule is brought into contact with a grinding surface of the grinding sheet. The base of the grinding device is then rotated until the surface of the leading end portion of the ferrule is ground into a spherical surface. The spherical surface of the leading end portion of the ferrule is then brought into contact with the grinding surface of the grinding sheet so that the longitudinal axis of the ferrule is inclined relative to the grinding surface.

Abstract: An end-face polishing and cleaning apparatus comprises at least one jig plate for supporting ferrules each fixed to an end of a respective optical fiber. At least one set of a polishing machine and a cleaning machine is provided for polishing and cleaning the end-faces of the ferrules while the ferrules are supported by the jig plate. A movable mounting device supports the jig plate and moves the jig plate between the polishing machine and the cleaning machine to polish and clean the end-faces of the ferrules. The movable mounting device has a holding member for supporting the jig plate, an elevation shaft for moving the holding member in a vertical direction, and a moving device for moving the holding member in a horizontal direction.

Abstract: A ferrule for optical connectors which is of funnel type comprising a ferrule body, containing a small-diameter hole and a large-diameter hole having a larger diameter than the small-diameter hole, the small-diameter hole and the large-diameter hole being formed so as to allow an optical fiber to pass therethrough and communicate with each other, the ferrule further comprising a buffering hole having a diameter which is larger than that of the small-diameter hole but smaller than that of the large-diameter hole, the buffering hole being formed between the small-diameter hole and the large-diameter hole and containing groove of concave and convex pattern on the internal surface of the buffering hole. The ferrule body further contains three lines of protrusions extending along the axial thereof, which are formed on the internal surface of the large-diameter hole.