Abstract: An optical connector that can stably connect even a tension-resistant jacket-covered optical fiber cord is provided. In an optical connector, which includes an optical connector plug 10 having a ferrule 14 holding an optical fiber and a housing 16 accommodating the ferrule, and an adapter connecting the optical connector plugs; the optical fiber is an optical fiber cord 12 in which at least the jacket carries tension, a secondary coated optical fiber (120) and the jacket (123) carrying the tension of the optical fiber cord 12 are secured to the ferrule 14, and the ferrule 14 is immovably mounted to the housing 16.

Abstract: An optical connector including a ferrule having a butt end face at a front portion thereof and positioning holes formed at opposite sides of the ferrule in a widthwise direction of the ferrule. A plurality of optical fibers are coupled to the ferrule, and the optical connector is adapted to be abutted against another optical connector in an abutting direction. The positioning pin holes and the plurality of optical fibers are arranged in parallel with each other at least in the vicinity of the butt end face of the ferrule so that an arrangement plane of the plurality of optical fibers and the positioning pin holes is inclined at an inclination angle of .theta. with respect to a plane of the abutting direction, and so that a line where the butt end face and the arrangement plane cross each other is orthogonal to each axis of the plurality of optical fibers.

Abstract: A novel optical connector that includes the following: an optical connector ferrule which is capable of fixing optical fibers; optical fibers fixed onto the optical connector ferrule, such that the end surfaces of the optical fibers project beyond an end surface of the optical connector ferrule; an adhesive for fixing the optical fibers onto the optical connector ferrule; and a member whose Young's Modulus is less than that of the optical fiber and is provided to an area on the end surface of the optical connector ferrule surrounding, at a minimum, the projected portions of the optical fibers. And when the end surface of the optical connector is polished, the ends of the optical fibers are capable of projecting from the end surface of the optical connector ferrule, even if the end surface portion of the optical connector ferrule contains a filler, the hardness of which is less than that of the optical fibers.

Abstract: The ferrule for optical connector according to this invention comprises a first grip portion having first through holes for insertion of optical fibers and gripping part of said optical fibers apart a predetermined distance from the distal ends of optical fibers; a second grip portion arranged along the insertion direction of optical fibers together with the first grip portion and opposed to the first grip portion through a first space. The second grip portion has second through holes for the optical fibers set through the first through holes to be further introduced therethrough, and grips the vicinity of the distal ends of optical fibers; and a pedestal portion projecting from a surface of the first grip portion.

Abstract: A method of collectively connecting multiple optical connectors each having an altered-shape portion which is at least one of a recessed shape or a projecting shape on an outer surface, and an aligning and positioning jig used in this method. After multiple optical connectors are aligned and positioned by using an aligning and positioning jig for engaging the altered-shape portions of the multiple optical connectors to one another to position the multiple optical connectors, multiple optical connectors aligned and positioned on one side are collectively connected to multiple optical connectors aligned and positioned on the other side. Then the aligning and positioning jig is removed from multiple pairs of connected optical connectors.

Abstract: A novel optical connector that includes the following: a optical connector ferrule which is capable of fixing optical fibers; optical fibers fixed onto the optical connector ferrule, such that the end surfaces of the optical fibers project beyond an end surface of the optical connector ferrule; an adhesive for fixing the opticalfibers onto the optical connector ferrule; and a member whose Young's Modulus is less than that of the optical fiber and is provided to an area on the end surface of the optical connector ferrule surronding, at a minimum, the projected portions of the optical fibers. And when the end surface of the optical connector is polished, the ends of the optical fibers are capable of projecting from the end surface of the optical connector ferrule, even if the end surface portion of the optical connector ferrule contains afiller, the hardness of which is less than that oaf the optical fibers.

Abstract: An optical fiber connector for splicing a plurality of optical fibers integrally, including V-groove substrates each comprising V-grooves for setting optical fibers therein. Further, positioning standard surfaces arranged in parallel with a V-groove forming direction are formed in the substrates to enable stacking of the substrates on the basis of the positioning standard surfaces.

Abstract: An optical connector for connecting optical fibers, comprises: a guide-groove substrate having grooves for positioning optical fibers and guide pins; an upper plate having groove portions each for covering the guide pins positioned in the guide grooves of the guide-groove substrate; elastic guide-pin pressing members each provided in the groove portions of the upper plate above portions where the guide pin grooves are in contact with the guide pins. In such a arrangement, it is preferable to form an oxide film on said V-grooves of the guide-groove substrate at least in the vicinity of contact points between the guide pins and the V-grooves. The optical connector further includes a resin molding portion for surrounding the substrate and the upper plate, the resin molding portion including a pair of opposite opened portions at a front and back surfaces thereof.

Abstract: Disclosed is an optical fiber connector for a plurality of covered optical fibers, including (a) a lower ceramics plate with a top plane surface having a plurality of V-grooves, each groove for respectively holding one fiber, (b) an upper plate, in spaced apart combination with the lower plate, for firmly holding the optical fibers in the lower plate grooves, and (c) a holder having two opposed end portions in which (i) a first cavity is profiled in the first end portion to accommodate the combination of the upper and lower plates, and (ii) a second cavity is profiled in the second end portion to accommodate the covered fibers, and wherein the first cavity has a connection portion proximate to an inner end of the second cavity, which connects the first and second cavities to provide a through passage for the fibers.

Abstract: A multifiber optical connector plug capable of realizing low reflection and low insertion loss, without using the refractive index matching material. The multifiber optical connector plug includes a connector plug member made of a plastic material, having a connecting facet on which endfaces of the optical fibers to be connected with other optical fibers are arranged in a transverse direction between the guide pin insertion holes, with the endfaces of the optical fibers projecting out of the connecting facet, the connecting facet being inclined with respect to an axial direction along optical axes of the optical fibers by an angle which is larger than a total reflection critical angle of light beams transmitted through the optical fibers. The connecting facet may have a flat surface shape or a convex ellipsoidal surface shape.

Abstract: A sealing apparatus has a main body which is mounted on a housing and is provided with a sealing lip, and a rotary body mounted on a rotary shaft of a member with which the apparatus is combined. The rotary body extends in the radial direction of the rotary shaft and has one side surface which is in sliding contact with the sealing lip. The apparatus also has at least one bent portion formed by bending a notch formed in an outer edge portion of a side surface of the rotary body.

Abstract: An improved radial oil seal adapted to be disposed between a housing bore and a rotation shaft inserted therein for sealing of fluid in a housing. The radial oil seal includes a first seal ring having a rubber seal lip in sealing contact with the rotation shaft, a second seal ring having a synthetic resin seal lip and disposed at the air side of and adjacent the first seal ring, the synthetic resin seal lip extending along the back face of the rubber seal lip and being in sealing contact with the rotation shaft. A reinforcing ring having a substantial rigidity is disposed at the air side of and adjacent the second seal ring and curved along a bent portion of the synthetic resin seal lip so as to support the back face of the bent portion. An outer ring is fitted into the housing bore for firmly holding the radially outer portions of the first and second seal rings and the reinforcing ring.

Abstract: A sealing apparatus disposed between a housing and a shaft received in the housing. The sealing apparatus has, at least, a fitting portion which is fitted to either one of the housing and the shaft, and a seal lip of an elastic material which extends axially obliquely from the fitting portion and is provided at its distal end with a seal portion. The sealing apparatus is provided with a bend preventing portion which is formed at the distal end of the seal lip such as to extend axially outwardly of the seal portion.