JP2012242451A - Optical transmission line connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of disconnection or excess bend of optical fibers between a mechanical splice and holders due to expansion/contraction of the optical fibers in a state where the optical fibers are permanently connected to each other.SOLUTION: An optical transmission line connection device 10 includes: a mechanical splice 40 capable of connecting a pair of optical fibers to each other; a pair of holders 42 holding a pair of coated optical fiber housing members; a splice support 44 supporting the mechanical splice in a prescribed position; a pair of holder supports 46 supporting the holders in prescribed positions; and a pair of bend forming parts 84 bending intermediate portions extending between the mechanical splice and the holders, of terminal regions of the pair of coated optical fibers in a prescribed bend range in a connection preparation state. Each bend forming part 84 includes a first movable member 86 movable between an action position where the first movable member is brought into contact with the intermediate portion of each coated optical fiber to bend the intermediate portion minimally in the prescribed bend range and a non-action position where the first movable member is not brought into contact with the intermediate portion of the coated optical fiber.

Description

  The present invention relates to an optical transmission line connection device that connects a pair of optical transmission line units each having an optical fiber to each other.

  In optical fiber connection technology, a pair of optical fibers whose coatings are partially removed within a predetermined end region of a pair of optical fiber cores (that is, coated optical fibers) are mutually coaxial with their front end surfaces being coaxial with each other. An optical fiber connecting device that can be permanently connected by the gripping force of the component parts without being fused or bonded in the butted state is known as, for example, the name “mechanical splice”. In addition, as a connection device applicable to an optical cable in which an optical fiber core wire is accommodated in an insulating jacket, a mechanical splice and an insulating jacket of a pair of optical cables in which optical fibers are connected to each other by the mechanical splice are pulled. 2. Description of the Related Art An optical transmission line connection device including a pair of holders that are fixedly held against an external force is known. An assembly including an optical fiber core and an optical fiber core and a core housing member (insulation jacket in the case of an optical cable) that at least partially accommodates the optical fiber core, such as an optical cable, is referred to as an “optical transmission line unit” in the present application. Collectively.

  For example, Patent Document 1 states that “the jackets 2A and 2B are connected in a state where the ends of the optical fibers 1A and 1B of the optical fiber cables F1 and F2 held by the jacket holding parts 4 and 5 are abutted with each other. An optical fiber connector 100 that includes a housing 10, a holding member 7 that holds the ends of the optical fibers 1A and 1B that are led out, a spring member that holds the holding member, and a jacket holding portion 4 and 5 mounted thereon. The guides 20 and 30 for guiding them inside, the restraint covers 60 and 70 for restraining the outer gripping parts 4 and 5 together with the housing 10, and the insertion arranged along the extending direction of the housing 10 while holding the holding member in a separated state Disclosed is an optical fiber connector 100 provided with a locking means for locking the guide 20 to the housing 10 when the unit and the jacket gripping portion 4 are accommodated in the housing 10. That.

  Patent Document 1 states that “when the first optical fiber 1A is abutted against the end of the second optical fiber 1B, the first optical fiber 1A bends 80 as shown in FIG. 10,” “first. The occurrence of the deflection 80 in the optical fiber 1A means that the end portion of the first optical fiber 1A and the end portion of the second optical fiber 1B are abutted with each other. Thus, it has been confirmed that the end of the first optical fiber 1A and the end of the second optical fiber 1B are abutted. "

JP 2010-145951 (Abstract, Paragraph 0047, Paragraph 0048)

  In an optical transmission line connecting device including a mechanical splice and a pair of holders, generally, after the connection between a pair of optical fibers is completed, the distance between the mechanical splice and the pair of holders is maintained constant. . Therefore, if the optical fiber expands or contracts due to environmental temperature changes, etc. in a state where the optical fibers are permanently connected by the mechanical splice, the optical fiber is disconnected between the mechanical splice and the individual holders. It is desired to prevent the occurrence of excessive deflection.

  According to one aspect of the present invention, a pair of optical transmission line units each having an optical fiber core formed by coating an optical fiber and a core wire accommodating member that at least partially accommodates the optical fiber core wire are connected to each other In the optical transmission line connecting apparatus, a mechanical splice operable between an open position for receiving a pair of optical fibers and a closed position for sandwiching and connecting the optical fibers, and a pair of core wire accommodating members respectively. A pair of holders to be held, a splice support part for supporting the mechanical splice at a predetermined position, and a pair of holders so that the pair of holders are linearly aligned with the mechanical splice supported by the splice support part. A pair of holder support portions for supporting the wire in a predetermined position, and a pair of portions in which the coating is partially removed in the end regions of the pair of optical fiber core wires The fiber is received in the end butted state by the mechanical splice in the open position supported by the splice support portion, and the pair of core wire receiving members project the end regions of the optical fiber core wires outward. The intermediate portion extending between the mechanical splice and the pair of holders in the end regions of the optical fiber core wires when being held by the pair of holders supported by the pair of holder support portions, is determined in advance. A pair of flexure forming portions that bend in a range, and each of the pair of flexure forming portions is in contact with an intermediate portion of each of the pair of optical fiber core wires to cause a minimum bend in the flexure range in the intermediate portion. An optical transmission line connection device comprising a first movable member that is movable between a position and a non-acting position that does not contact the intermediate portion.

  In the optical transmission line connecting device according to one aspect of the present invention, the first movable member of the pair of bending forming portions is disposed in the middle portion of the corresponding optical fiber core wire with respect to the pair of optical transmission line units in the connection preparation state. It can arrange | position in the action position which produces the minimum bending within a predetermined bending range. In this state, when the mechanical splice is moved from the open position to the closed position to complete the connection between the optical fibers of the two optical transmission line units, both the mechanical splice and the holders are separated by a certain distance. The intermediate portions of the optical fiber cores are supported by the first movable member in the working position, and maintain at least a minimum deflection in each. Thereafter, by moving both movable members from the operating position to the non-operating position, the first movable member is separated from the intermediate portion of the corresponding optical fiber core wire, and the intermediate portions of both optical fiber core wires are moved to the respective positions. It can be stretched in an unconstrained state in the space between the mechanical splice and both holders while ensuring at least the minimum deflection. Therefore, according to the optical transmission line connecting device, when the optical fiber contracts in the length direction due to a temperature change of the environment or the like with the mechanical splice permanently connected to each other, the optical fiber core Since the minimum bending secured in the middle part of the wire absorbs such contraction, it is possible to prevent the optical fiber from being disconnected between the mechanical splice and the individual holders. In addition, if the optical fiber extends in the length direction due to temperature changes in the environment after the completion of the connection between the optical fibers by mechanical splicing, at least the intermediate portion of the optical fiber core wire with which the minimum deflection is secured Since it is possible to bend further up to the maximum deflection within the predetermined deflection range, the optical fiber between the mechanical splice and the individual holders is caused to have an excessive deflection exceeding the predetermined deflection range, and the signal transmission loss due to the excessive deflection. It can be prevented from occurring.

1 is a perspective view of an optical transmission line connection device according to an embodiment of the present invention. It is a disassembled perspective view of the optical transmission line connection apparatus of FIG. It is a schematic sectional drawing in alignment with line III-III of the optical transmission line connection apparatus of FIG. It is a perspective view which shows an example of the optical transmission line unit which can use the optical transmission line connection apparatus of FIG. 1 with a holder, Comprising: (a)-(c) shows the procedure which attaches a holder to an optical transmission line unit. It is a perspective view which shows the other example of the optical transmission line unit which can use the optical transmission line connection apparatus of FIG. 1 with a holder, Comprising: (a)-(d) is the procedure which attaches a holder to an optical transmission line unit. Show. It is sectional drawing along line III-III of the optical transmission line connection apparatus of FIG. 1, and shows in the state which isolate | separated a pair of holder attached to each of a pair of optical transmission line unit. It is a perspective view which shows the optical transmission line connection apparatus of FIG. 1 in the connection preparation state which mounted | wore with a pair of holder attached to each of a pair of optical transmission line unit. It is a front view of the optical transmission line connection apparatus of FIG. It is an expansion perspective view which shows the 1st movable member which the optical transmission line connection apparatus of FIG. 1 has. It is a partial cross section end view which shows the optical transmission line connection apparatus of FIG. 1 in the state which abbreviate | omitted the holder. FIGS. 2A and 2B are plan views showing one step of an optical connection method using the optical transmission line connecting device of FIG. 1, and FIGS. It is a partial expansion perspective view which shows one step of the optical connection method using the optical transmission line connection apparatus of FIG. FIG. 3 is a partial enlarged cross-sectional view showing one step of an optical connection method using the optical transmission line connection device of FIG. 1, showing the function of the first movable member. FIG. 3 is a partial enlarged cross-sectional view illustrating one step of an optical connection method using the optical transmission line connection device of FIG. 1, and (a) to (c) illustrate functions of a second movable member. FIGS. 2A and 2B are perspective views showing one step of an optical connection method using the optical transmission line connection device of FIG. 1, and FIGS. FIGS. 2A and 2B are partially enlarged cross-sectional views illustrating one step of an optical connection method using the optical transmission line connection device of FIG. 1, and FIGS. It is a disassembled perspective view which shows the optical transmission line connection apparatus by a modification in the state which abbreviate | omitted the holder. FIGS. 17A and 17B are cross-sectional views showing the optical transmission line connection device of FIG. 17 in a state where a holder is attached, and FIGS. It is a disassembled perspective view which shows the optical transmission-line connection apparatus by another modification in the state which abbreviate | omitted the holder. FIGS. 19A and 19B are cross-sectional views showing the optical transmission line connection device of FIG. 19 in a state where a holder is mounted, and FIGS. It is a disassembled perspective view which shows the optical transmission-line connection apparatus by another modification in the state which abbreviate | omitted the holder. FIGS. 21A and 21B are cross-sectional views illustrating the optical transmission line connection device of FIG. 21 with a holder attached, and FIGS.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Corresponding components are denoted by common reference symbols throughout the drawings.
1 to 3 show an optical transmission line connection device 10 according to an embodiment of the present invention in a state where an optical transmission line unit to be connected is not attached. 4 and 5 respectively show two types of optical transmission line units 12 and 14 that can use the optical transmission line connection device 10. FIG. 6 shows the optical transmission line connection device 10 with a pair of optical transmission line units 12 separated. 7 and 8 show the optical transmission line connection device 10 in a state where the pair of optical transmission line units 12 are ready for connection. The optical transmission line connection device 10 includes a pair of optical transmission line units 12 or 12 each having an optical fiber core formed by coating an optical fiber and a core housing member that at least partially houses the optical fiber core. 14 (see FIG. 4 or FIG. 5) can be connected to each other.

  In the present application, “optical fiber core wire” refers to an optical fiber clad outer surface with a soft coating, and “optical fiber” refers to a coating with this coating removed. The “optical cable” refers to a single-core or multi-fiber optical fiber core built in an insulation jacket together with a tensile member, and includes “optical cord” in a broad sense. The “optical transmission line unit” refers to an optical fiber core having an optical fiber core and a core housing member (an insulation jacket in the case of an optical cable) that at least partially houses the optical fiber core. .

  First, the configuration of the illustrated optical transmission line units 12 and 14 will be described as an example of an optical transmission line unit that can be optically connected using the optical transmission line connection device 10. The optical transmission line unit 12 shown in FIG. 4 is an optical cable that can be used as a drop optical cable for an aerial lead-in wire. The optical transmission line unit 12 includes a single-core optical fiber 20 having a coating 18 on an optical fiber 16 and an optical fiber 20 And a core wire housing member 22 for housing the wire over the entire length. The core wire housing member 22 of the optical transmission line unit (optical cable) 12 is a flexible resin insulation jacket. In the optical transmission line unit (optical cable) 12, the optical fiber core wire 20 is accommodated in the core wire accommodation member (insulation jacket) 22 together with a tensile member (not shown) substantially without a gap.

  An optical transmission line unit 14 shown in FIG. 5 is an optical fiber core 28 formed by coating an optical fiber 24 with a coating 26, for example, one light exposed from an insulating jacket at the end of a multi-core optical cable or the like (not shown). A fiber core wire 28 and a fiber core accommodating member 30 that stores the optical fiber core wire 28 over a predetermined length are provided. The optical fiber housing member 30 of the optical transmission line unit 14 includes an optical fiber core 28 that can be fixedly received by receiving the optical fiber core 28 in the slit 32, and an optical fiber core that is held by the optical fiber gripper 34. A boot portion 38 capable of accommodating a subsequent region adjacent to the grasped region of the line 28 in the hollow portion 36 is provided. The core wire gripping part 34 and the boot part 38 can be formed integrally with each other from a material having flexibility in itself such as a thermoplastic elastomer or a synthetic rubber. The core wire accommodating member 30 receives the gripping region of the optical fiber core wire 28 in the slit 32 of the core wire gripping portion 34, and an external force in the direction of narrowing the slit 32 is applied to the core wire gripping portion 34. The optical fiber core wire 28 can be fixed to the core wire gripping portion 34 and gripped. In this state, the subsequent region adjacent to the gripped region of the optical fiber core 28 is accommodated in the hollow portion 36 of the boot portion 38 via a gap. In addition, what has the structure similar to the core wire accommodating member 30 is disclosed as “optical fiber core wire support member” in Japanese Patent Application No. 2010-007119, which is a prior application of the applicant of the present application.

  The illustrated optical transmission line connection device 10 is provided between an open position for receiving the optical fibers 16 or 24 of the pair of optical transmission line units 12 or 14 and a closed position for sandwiching the optical fibers 16 or 24 and connecting them. An operable mechanical splice 40, a pair of holders 42 for holding the core wire accommodating members 22 or 30 of the pair of optical transmission line units 12 or 14, respectively, and a splice support portion for supporting the mechanical splice 40 at a predetermined position. 44 and a pair of holder support portions 46 for supporting each of the pair of holders 42 at a predetermined position so that the pair of holders 42 are linearly aligned with respect to the mechanical splice 40 supported by the splice support portion 44. It has.

  The mechanical splice 40 is a hollow rod-shaped main body 48, a strand fixing member 50 that is built in the main body 48 and can be opened and closed to sandwich the optical fiber 16 or 24, and is displaceably assembled to the main body 48 to fix the strand. And an actuating member 52 that opens and closes the member (FIGS. 2 and 6). The strand fixing member 50 has a form in which a plate-like member made of a malleable material such as aluminum is folded in two, and the optical fiber 16 or 24 is disposed between the mutually facing surfaces of a pair of wing portions 50a facing each other. Can be fixedly held. The main body 48 is made of a suitable resin material, and the wire fixing member 50 can be received in the hollow portion 48a (FIG. 6) in a state where the wire fixing member 50 can be opened and closed. The actuating member 52 is made of a suitable resin material, and can receive both wing portions 50a of the wire fixing member 50 received in the main body 48 in the groove portion 52a (FIG. 6). By displacing, the inner wall surface of the groove portion 52a can be engaged with both wing portions 50a of the wire fixing member 50 so that the wing portions 50a can be pressed toward each other.

  When the mechanical splice 40 is in the open position, the actuating member 52 is placed in a preparation position (FIGS. 1 to 3 and FIGS. 6 to 8) protruding from the main body 48, and is received in the hollow portion 48a of the main body 48. Both wing portions 50a of the wire fixing member 50 are in a state in which the respective clamping surfaces are separated from each other. In the open position, the optical fiber 16 or 24 can be smoothly inserted and removed between the blade portions 50 a of the strand fixing member 50 through the fiber insertion holes 54 formed at both ends in the longitudinal direction of the main body 48. When the actuating member 52 is displaced so as to be pushed into the main body 48 from this open position, an external force is applied from the actuating member 52 to the blade portions 50a of the wire fixing member 50 in the mutual approaching direction to close both the blade portions 50a, and the mechanical splice. 40 moves to the closed position. In the closed position, pressure is applied to the optical fiber 16 or 24 from the sandwiching surfaces of the blade portions 50a of the strand fixing member 50, whereby the optical fiber 16 or 24 is firmly fixed and sandwiched between the blade portions 50a.

  The holder 42 is the end portion 22a (FIG. 4) of the core wire housing member (insulation jacket) 22 of the optical transmission path unit (optical cable) 12 or the core wire gripping portion 34 of the core wire housing member 30 of the optical transmission path unit 14. The pressure holding part 56 which can hold | maintain in the state which applied the pressing force from the outer side, and the cover part 60 connected with the pressure holding part 56 through the hinge part 58 which can be bent repeatedly are provided. The pressing holding portion 56 has a groove-like recess 62 that receives the distal end portion 22 a of the core wire housing member 22 or the core wire gripping portion 34 of the core wire housing member 30. A plurality of sawtooth-shaped protrusions 64 are formed on the opposing surface (FIGS. 4 and 5). When the end portion 22 a of the core wire housing member 22 or the core wire gripping portion 34 of the core wire housing member 30 is fitted into the recess 62 of the pressing holding portion 56 of the holder 42, the plurality of protrusions 64 become the end portion 22 a or the core wire. By pressing the grip portion 34, the holder 42 is substantially fixed to the core wire accommodating member 22 or 30 of the optical transmission line unit 12 or 14. When the holder 42 is attached to the optical transmission line unit 14, the pressing force applied to the core wire gripping portion 34 of the core wire housing member 30 by the protrusion 64 of the press holding portion 56 is reduced by the core wire gripping portion 34. It is large enough to fix and hold the optical fiber core wire 28 to 32.

  The lid portion 60 of the holder 42 can rotate around the hinge portion 58 between a closed position where the upper end opening of the recess 62 of the press holding portion 56 is closed and an open position where the opening is opened. When the lid portion 60 is in the closed position, the end portion 22a of the core wire accommodating member 22 or 30 of the optical transmission path unit 12 or 14 or the core wire gripping portion 34 is recessed in cooperation with the pressing holding portion 56. It acts to fix and hold at place 62 without rattling. The pressing holding portion 56 and the lid portion 60 are respectively provided with latching elements 66 and 68 for snapping the lid portion 60 in the closed position (FIGS. 4 and 5).

  The holder 42 further includes an extending portion 68 that extends outward from the pressing holding portion 56 along the extending direction of the recess 62 of the pressing holding portion 56. The extension portion 68 predetermines an exposed portion of the optical fiber core wire 20 or 28 that is exposed and extended from the core wire housing member 22 or 30 of the optical transmission line unit 12 or 14 held by the press holding portion 56. It acts to siege in a non-contact manner over the entire length. The holder 42 having the above configuration can be integrally formed as a whole from an appropriate resin material.

  The optical transmission line connecting device 10 includes a base member 72 having a splice support portion 44 and a pair of holder support portions 46 (FIG. 2). The base member 72 is a substantially rectangular plate-like member in plan view, and a splice support portion 44 is provided at the center in the longitudinal direction, and holder support portions 46 are provided at both ends in the longitudinal direction. The base member 72 as a whole including the components of the splice support portion 44 and the holder support portion 46 can be integrally formed from a suitable resin material.

  The splice support portion 44 includes a single support groove portion 74 formed on the upper surface 72 a of the base member 72 along a central axis 72 b extending in the longitudinal direction thereof, and the base member 72 adjacent to both longitudinal ends of the support groove portion 74. And two sets of support wall portions 76 formed on the upper surface 72a (FIGS. 1 and 2). The support groove portion 74 supports the bottom surface of the main body 48 of the mechanical splice 40. Each set of support wall portions 76 supports longitudinal end regions on both sides of the body 48 of the mechanical splice 40. The splice support portion 44 can statically support the mechanical splice 40 in a posture along the axis 72 b of the base member 72 by the support groove portion 74 and the support wall portion 76.

  Each of the pair of holder support portions 46 includes a pair of side plate portions 78 erected on the upper surface 72a side in the longitudinal end region of the base member 72 (FIGS. 1 and 2). The side plate portions 78 are disposed substantially parallel to each other along both side edges of the upper surface 72 a of the base member 72, and the mutually opposing surfaces cooperate with the upper surface 72 a of the base member 72 so that the holder 42 does not rattle. A retractable recess 80 is defined. Each side plate portion 78 is provided with an elastic arm 82 extending as a cantilever as a part thereof. At the tip (free end) of the elastic arm 82, a claw 82a that can be engaged with the outer surface of the holder 42 in a snap manner is formed (FIG. 2). The holder support portion 46 is substantially stationaryly supported in the recess 80 by the side plate portion 78 and the elastic arm 82 so that the holder 42 is linearly aligned with the mechanical splice 40 supported by the splice support portion 44. can do.

  When the pair of optical transmission line units 12 (or 14) are optically connected to each other using the optical transmission line connection device 10, a predetermined end region of the optical fiber core wire 20 (or 28) is prepared as a connection preparation state. A pair of optical fibers 16 (or 24) with the coating 18 (or 26) partially removed within 20a (FIG. 4) (or 28a (FIG. 5)) are in the open position supported by the splice support 44. The pair of core wire accommodating members 22 (or 30) of the optical transmission line unit 12 (or 14) are received in the mechanical splice 40 in a state of leading end but the terminal region of the optical fiber core wires 20 (or 28). 20a (or 28a) is supported by a pair of holder support portions 46 at a portion projecting outward (that is, the end portion 22a of the core wire housing member 22 (or the core wire gripping portion 34 of the core wire housing member 30)). Each of which is held by the pair of holders 42 (FIG. 7, FIG. 8). In this connection preparation state, the pair of optical transmission line units 12 (or 14) are disposed on the optical transmission line connection device 10 at positions where they can be optically connected to each other, but the mechanical splice 40 is at the open position. The connection between the optical fibers 16 (or 24) is not completed. In the connection preparation state, the optical transmission line connecting device 10 is an intermediate portion extending between the mechanical splice 40 and the pair of holders 42 in the terminal region 20a (or 28a) of the pair of optical fiber core wires 20 (or 28). A portion 20b (FIG. 4) (or 28b (FIG. 5)) is further provided with a pair of bending forming portions 84 that bend in a predetermined bending range (FIGS. 1 to 3). The bending range of the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) is determined by taking into account mechanical damage due to bending of the optical fiber 16 (or 24) and signal transmission loss due to temperature changes. Etc. are determined in advance.

  Each of the pair of deflection forming portions 84 contacts the intermediate portion 20b (or 28b) of each optical fiber core wire 20 (or 28) in the connection ready state, and minimizes the minimum deflection in the above-described deflection range. ) And the non-contacting position of the optical fiber 20 (or 28) of each optical fiber core wire 20 (or 28) that is in a ready state for connection (and thus does not restrain the bending of the intermediate part 20b (or 28b)). A first movable member 86 that is movable between the operation positions is provided. The first movable member 86 is installed between the splice support portion 44 and the holder support portion 46 on the upper surface 72 a side of the base member 72. Most of the first movable member 86 is configured to be spaced further upward from the upper surface 72a of the base member 72 in the operating position than in the non-operating position.

  As shown in an enlarged view in FIG. 9, the first movable member 86 is a piece-like member having a V-groove-shaped recess 88. The first movable member 86 moves the intermediate portion 20b (or 28b) of the pair of optical fiber cores 20 (or 28) in the above-mentioned connection ready state at the operation position and the non-operation position and at an intermediate position between these positions. It is configured to be received in the recess 88. At the bottom end of the concave portion 88, the optical fiber core is disposed during the operation (FIG. 12) of placing the holder 42 holding the core wire accommodating member 22 (or 30) of the optical transmission path unit 12 (or 14) on the holder support portion 46. The optical fiber 16 (or 24) exposed in the end region 20a (or 28a) of the wire 20 (or 28) is directed toward the mechanical splice 40 (particularly the fiber insertion hole 54 of the main body 48) supported by the splice support 44. A guide passage 90 for guiding is formed. The guide passage 90 is brought into contact with the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) in the working position at a position close to the fiber introduction end 90a, thereby minimizing the bending of the intermediate portion 20b ( Alternatively, a contact surface 92 is provided which is generated in 28b). FIG. 10 shows the positional relationship between the guide passage 90 and the contact surface 92 of the first movable member 86 in the operating position and the fiber insertion hole 54 of the mechanical splice 40 in an end view with the holder 42 omitted.

  In the illustrated configuration, the first movable member 86 is installed on the base member 72 so as to be rotatable between an operating position and a non-operating position. The first movable member 86 has a pair of bearing grooves 94 formed at one end of the guide passage 90 on the side separated from the fiber introduction end 90a, and the outer surface of the guide passage 90 on the side close to the fiber introduction end 90a. Then, a retaining groove 96 is formed (FIG. 9). On the other hand, the base member 72 is provided with a pair of extension plate portions 98 extending from the pair of side plate portions 78 of each holder support portion 46 in the direction toward the splice support portion 44, and the mutually opposing surfaces of the extension plate portions 98. In addition, a pair of support shafts 100 project from each other (FIG. 2). These support shafts 100 define the rotational axis of the first movable member 86 substantially parallel to the upper surface 72 a of the base member 72. The first movable member 86 has a support shaft 100 corresponding to the bearing groove 94 rotatably inserted therein, and a rotation axis defined by the support shaft 100 is defined between the pair of extension plate portions 98 of the base member 72. It is received in a posture that can rotate in the center. The first movable member 86 of the rotary type is disposed so that the bottom surface 86a thereof is separated from the upper surface 72a of the base member 72 at an acute angle in the operating position (FIG. 3). The bottom surface 86a is arranged close to the top surface 72a of the base member 72 so as to be substantially parallel (FIG. 16). Further, a protrusion 102 is formed at a position away from the support shaft 100 on at least one of the mutually facing surfaces of the two extension plate portions 98 (FIG. 2). The protrusion 102 is detachably fitted into the latching groove 96 of the first movable member 86 so as to be detachable, and detachably latches the first movable member 86 at the operating position.

  In the illustrated optical transmission line connection device 10 in which each of the pair of bending forming portions 84 includes the first movable member 86, both of the movable formation units 84 are movable with respect to the pair of optical transmission line units 12 (or 14) in the connection preparation state described above. The member 86 can be placed at an operating position that causes a minimum deflection within a predetermined deflection range in the intermediate portion 20b (or 28b) of the corresponding optical fiber core wire 20 (or 28). In this state, when the mechanical splice 40 is moved from the open position to the closed position to complete the connection between the optical fibers 16 (or 24) of the two optical transmission line units 12 (or 14), a certain distance is provided. Between the mechanical splice 40 and the holders 42, the intermediate portions 20b (or 28b) of the optical fiber cores 20 (or 28) are supported by the first movable member 86 in the working position, and at least each of them. Maintain minimum deflection. Thereafter, both the movable members 86 are moved from the operating position to the non-operating position, so that the movable member 86 is separated from the intermediate portion 20b (or 28b) of the corresponding optical fiber core wire 20 (or 28). The intermediate portion 20b (or 28b) of the core wire 20 (or 28) can be stretched in an unconstrained state in the space between the mechanical splice 40 and both holders 42 while ensuring at least a minimum deflection in each.

  Therefore, according to the optical transmission line connecting device 10, the optical fiber 16 (or 24) is caused by the temperature change of the environment or the like with the mechanical splice 40 permanently connecting the optical fibers 16 (or 24). When contracted in the length direction, the minimum bending secured in the intermediate portion 20b (or 28b) of the optical fiber core 20 (or 28) absorbs such contraction, so that the mechanical splice 40 and the individual holders It is possible to prevent the optical fiber 16 (or 24) from being disconnected from the terminal 42. In addition, after the connection between the optical fibers 16 (or 24) by the mechanical splice 40 is completed, at least the minimum deflection is ensured when the optical fiber 16 (or 24) extends in the length direction due to a change in the environmental temperature or the like. Since the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) is further deflected until it reaches the maximum deflection within a predetermined deflection range, it is between the mechanical splice 40 and the individual holders 42. In the optical fiber 16 (or 24), it is possible to prevent the occurrence of excessive deflection exceeding the predetermined deflection range and the occurrence of signal transmission loss due to excessive deflection.

  The first movable member 86 includes a guide passage 90 that guides the optical fiber 16 (or 24) exposed at the end of the optical fiber core wire 20 (or 28) toward the mechanical splice 40. Since the abutment surface 92 provided on the optical fiber core wire 20 (or 28) has a configuration that causes a minimum deflection in the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28), the core of the optical transmission line unit 12 (or 14) is provided. Along with the operation of placing the holder 42 holding the wire accommodating member 22 (or 30) on the holder support portion 46, the intermediate portion 20b (or 28b) is caused to bend at a minimum in a safe and reliable manner without the operator's intention. Can do. Therefore, the minimum deflection of the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) can be ensured with good reproducibility without requiring the skill of the operator. Note that the operation mode between the operating position and the non-operating position of the first movable member 86 is not limited to the illustrated rotating operation, and, for example, a linear operation described later may be employed.

  In the optical transmission line connection device 10, as will be described later, during the work for placing the pair of optical transmission line units 12 (or 14) in the connection preparation state described above, the pair of optical fiber cores 20 (or 28) In the intermediate portion 20b (or 28b), at least the minimum bend is ensured by the function of the corresponding first movable member 86, but there is a case where a difference occurs between the bend amounts. When the difference in the amount of bending is large, there is a concern that the bending exceeding the predetermined bending range occurs in any one of the intermediate portions 20b (or 28b). Therefore, the illustrated optical transmission line connection device 10 can further include a second movable member 104 that can be operated independently of the first movable member 86 in each of the pair of bending forming portions 84 (FIG. 1). To FIG. 3).

  The second movable member 104 contacts the intermediate portion 20b (or 28b) of each of the pair of optical fiber core wires 20 (or 28) in the connection preparation state, and the maximum bending in the predetermined bending range described above is the intermediate portion. 20b (or 28b) is caused to act, and the intermediate portion 20b (or 28b) of each optical fiber core wire 20 (or 28) in the ready state for connection is not contacted (and hence the intermediate portion 20b (or 28b) is bent). It is movable between non-acting positions. The second movable member 104 is installed above the first movable member 86 on the upper surface 72 a side of the base member 72. The second movable member 104 is configured so that most of the second movable member 104 is spaced further upward from the upper surface 72a of the base member 72 than in the operating position in the non-operating position.

  The second movable member 104 is a lid-like member that can be disposed so as to hold the pair of side plate portions 78 and the pair of extension plate portions 98 of the base member 72, and the holder 42 and the first movable member at the operating position. An upper plate portion 106 arranged to cover 86 from above, and both side plate portions 78 and both extension plates of the base member 72 erected substantially parallel to each other along both side edges from the upper plate portion 106. A pair of side plate portions 108 disposed adjacent to the outer surface of the portion 98 are integrally provided (FIG. 2). The upper plate portion 106 is formed with a protruding wall 110 that is inserted into the space between the holder 42 and the first movable member 86 at the operating position, and is supported by the splice support portion 44 at substantially the center of the protruding wall 110. The meandering of the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) between the mechanical splice 40 and the holder 42 supported by the holder support 46 is secured by the first movable member 86. A guide groove 112 is formed to prevent bending in a direction different from the required deflection (FIG. 1). The guide groove 112 has an abutment surface 114 that abuts against the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) at the working position to cause maximum deflection in the intermediate portion 20b (or 28b). Provided. FIG. 10 shows the guide groove 112 and the contact surface 114 of the second movable member 104 in the working position, the guide passage 90 and the contact surface 92 of the first movable member 86 in the working position, and the fiber of the mechanical splice 40. The positional relationship with the insertion hole 54 is shown in an end view with the holder 42 omitted.

  In the illustrated configuration, the second movable member 104 is installed on the base member 72 so as to be rotatable between an operating position and a non-operating position. In each side plate portion 108 of the second movable member 104, a bearing hole 116 is formed at one end separated from the protruding wall 110, and a latch arm 118 is formed at the other end opposite to the bearing hole 116. (FIG. 2). A pair of support shafts 120 project from the outer surface of the pair of extension plate portions 98 on the base member 72 (FIG. 2). The support shafts 120 define the rotational axis of the second movable member 104 substantially parallel to the upper surface 72a of the base member 72 (and thus substantially parallel to the rotational axis of the first movable member 86). The second movable member 104 is rotatably fitted with a support shaft 120 corresponding to the bearing hole 116, and a pair of extension plate portions 98 of the base member 72 is centered on a rotation axis defined by the support shaft 120. Mounted in a rotatable position. Such a rotary-type second movable member 104 is disposed and arranged close to the upper position 72a of the base member 72 so that the upper plate portion 106 is substantially parallel to the upper surface 72a of the base member 72 (FIG. 13). In the operating position, the upper plate portion 106 is arranged so as to be separated from the upper surface 72a of the base member 72 so as to be substantially orthogonal (FIG. 3). In addition, protrusions 122 are formed on the outer surfaces of the pair of side plate portions 78 of the base member 72 at positions away from the support shaft 120 (FIG. 2). The projection 122 is snapped on the corresponding latch arm 118 of the second movable member 104 so as to be detachable, and latches the second movable member 104 in the operating position.

  In the illustrated optical transmission line connection device 10 in which each of the pair of bending forming portions 84 has the second movable member 104, the second optical transmission line unit 12 (or 14) in the connection preparation state described above is connected to the optical transmission line connection unit 12 (or 14). The second movable member 104 is arranged at the non-operating position, and the first movable member 86 secures the minimum deflection within the predetermined deflection range in the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28). Later, both movable members 104 can be placed in the working position that causes maximum deflection within a predetermined deflection range in the intermediate portion 20b (or 28b) of the corresponding optical fiber core wire 20 (or 28). Accordingly, the intermediate portion 20b (or 28b) of the pair of optical fiber core wires 20 (or 28) is secured to one of the intermediate portions 20b (or 28b) by the operation of ensuring the minimum bending of the intermediate portion 20b (or 28b) of the pair of optical fiber cores 20 (or 28). When a deflection exceeding the deflection range occurs, by arranging both movable members 104 at the operating position, the deflection of the intermediate portion 20b (or 28b) is reduced to the maximum deflection within the predetermined deflection range and both the intermediate portions 20b. (Or 28b) is substantially balanced within a predetermined deflection range (that is, the amount of deflection of both of the intermediate portions 20b (or 28b) of the pair of optical fiber cores 20 (or 28) is predetermined). It can be adjusted so as to be within the bending range). In this state, when the mechanical splice 40 is moved from the open position to the closed position to complete the connection between the optical fibers 16 (or 24) of the two optical transmission line units 12 (or 14), a certain distance is provided. Between the mechanical splice 40 and the holders 42, the intermediate portions 20b (or 28b) of the optical fiber core wires 20 (or 28) are respectively within a predetermined deflection range by the second movable member 104 at the operating position. The state which exhibited the bending of is maintained.

  As described above, in the illustrated optical transmission line connection device 10, the pair of optical fiber cores 20 (or 28) is placed in the operation for placing the pair of optical transmission line units 12 (or 14) in the connection preparation state described above. Even when any one of the intermediate portions 20b (or 28b) bends exceeding a predetermined bend range, the function of the second movable member 104 reduces such excessive bend to the maximum bend and The optical fibers 16 (or 24) can be permanently connected by the mechanical splice 40 in a state where the deflection of the portion 20b (or 28b) is substantially balanced within a predetermined deflection range. Therefore, according to the optical transmission line connection device 10, it is possible to prevent signal transmission loss due to excessive bending in the pair of optical fibers 16 (or 24) optically connected.

  The second movable member 104 meanders in a direction different from the required deflection of the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) extending between the mechanical splice 40 and the holder 42. In addition to the guide groove 112 that prevents the optical fiber core wire 20 (or 28b), the abutment surface 114 provided in the guide groove 112 causes maximum bending in the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28). From the non-operating position to the operating position to move the second movable member 104 so as to cover the holder 42 arranged on the holder support 46, the intermediate portion 20b ( Alternatively, maximum deflection can occur in 28b). Therefore, the maximum deflection of the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) can be ensured with good reproducibility without requiring operator skill. In addition, the operation | movement aspect between the action position of the 2nd movable member 104 and a non-action position is not limited to rotation operation shown in figure, For example, the linear operation | movement mentioned later can also be employ | adopted.

  The illustrated optical transmission line connecting device 10 includes a holder presser that holds each of the pair of holders 42 in a stationary state on each of the pair of holder support portions 46 when the second movable member 104 is in the operating position. 124 is further provided (FIG. 3). The holder pressing portion 124 includes a first protrusion 125 provided at an approximately center of the upper surface 72a at the longitudinal end of the base member 72, the upper plate portion 106 and the pair of side plate portions 108 of the second movable member 104, and the side plates. The second protrusion 126 is provided between the latching arms 118 of the portion 108 and provided at the approximate center of the upper plate portion 106. When the second movable member 104 is in the operating position, the upper plate portion 106 of the second movable member 104 is moved from the upper surface 72a of the base member 72 of the holder 42 accommodated in the recess 80 of the holder support 46. This prevents the floating and prevents the first protrusion 125 from being received in the recess 56 a provided in the pressing holding portion 56 of the holder 42. Further, when the second movable member 104 is in the operating position, the second protrusion 126 is received in a recess 60 a provided in the lid portion 60 of the holder 42 housed in the recess 80 of the holder support portion 46. Further, when the second movable member 104 is in the operating position, the pair of side plate portions 108 of the second movable member 104 supports the elastic arms 82 of the side plate portions 78 of the base member 72 from the outside, and It acts to maintain the state in which the claws 82a of the elastic arms 82 are engaged with the outer surface of the holder 42 accommodated in the recess 80 of the holder support 46. As a result, the holder pressing portion 124 prevents the holder 42 from rattling in the recess 80 and falling off from the recess 80. As described above, in the illustrated optical transmission line connecting device 10, the holder pressing portion is moved along with the operation of moving the second movable member 104 from the non-operating position to the operating position so as to cover the holder 42 arranged on the holder support portion 46. 124 holds the holder 42 in a stationary state on the holder support 46.

  The illustrated optical transmission line connecting device 10 further includes a splice presser 128 that holds the mechanical splice 40 in a stationary state on the splice support 44 when the second movable member 104 is in the non-operating position. (FIGS. 1 and 3). The splice presser 128 includes a protrusion 128 that is provided at the approximate center of the upper plate portion 106 between the pair of bearing holes 116 of the second movable member 104. When the second movable member 104 is in the non-operating position, the splice pressing portion (projection) 128 is brought into contact with the upper surface of the main body 48 of the mechanical splice 40 disposed on the splice support portion 44 at the tip thereof, and the mechanical splice. The main body 48 of the fork 40 acts to forcibly maintain the state of being supported by the support groove portion 74 of the splice support portion 44 (FIG. 1). As described above, in the illustrated optical transmission line connecting device 10, the splice presser 128 stops the mechanical splice 40 on the splice support 44 in accordance with the operation of placing the second movable member 104 in the non-operating position. Will hold on.

  The illustrated optical transmission line connecting device 10 is used for the operation of the splice operation unit 130 for operating the mechanical splice 40 supported by the splice support unit 44 from the open position to the closed position described above, and the splice operation unit 130 for operating the mechanical splice 40. Accordingly, when the first movable member 86 is moved from the working position to the non-working position and the second movable member 104 is in the non-working position, the operation of the splice operation unit 130 is performed. And a stop part 134 that prevents the operation of the movable member drive part 132 (FIGS. 2 and 7).

  The splice operation unit 130 includes an operation member 136 that is rotatably supported by the base member 72. The operation member 136 is a substantially rectangular flat plate member in plan view, and is pivotally connected to one side edge of the base member 72 at one side edge thereof, and one surface 136a thereof is an upper surface 72a of the base member 72. In contrast, the base member 72 can be rotated between an operation position that is spaced apart and substantially parallel to the surface, and a non-operation position (FIG. 2 and the like) in which the surface 136a does not oppose the upper surface 72a of the base member 72. Yes. A pressing groove portion 138 is formed on the surface 136a of the operation member 136 so as to face the support groove portion 74 of the splice support portion 44 at the operating position. When the operating member 136 is placed in the non-operating position and the mechanical splice 40 in the open position is statically supported by the splice support portion 44 in a predetermined posture, the operating member 136 is moved from the non-operating position to the operating position. During the movement, the pressing groove portion 138 of the operating member 136 is brought into contact with the top surface of the operating member 52 of the mechanical splice 40. When the operating member 136 is forcibly rotated from the position toward the base member 72, an external force is applied from the operating member 136 to the operating member 52, and the operating member 52 is displaced so as to be pushed into the main body 48. When the member 136 reaches the operating position, the mechanical splice 40 shifts to the closed position.

  In the illustrated configuration, latching elements 140 and 142 for snapping the operating member 136 to the operating position are provided on each of the operating member 136 and the base member 72 (FIG. 7). The operation member 136 is provided with a pair of hooking elements 140 on the surface 136 a side along a side edge opposite to the side edge connected to the base member 72. Of the two sets of support wall portions 76 of the splice support portion 44, the base member 72 has a protrusion-shaped hook on the outer surface of the pair of support wall portions 76 on the side away from the side edge connected to the operation member 136. Each stop element 142 is provided. The latching elements 140 and 142 are snapped onto each other to latch the operating member 136 in the operating position.

  The movable member driving unit 132 includes a protrusion 132 provided on the surface 136 a of the operation member 136 of the splice operation unit 130. When the operating member 136 is moved from the non-operating position to the operating position, the movable member driving portion (projection) 132 of the first movable member 86 disposed at the operating position on the upper surface 72a of the base member 72 is moved during the movement. It abuts on the top surface. When the operating member 136 is further forcibly moved from the position toward the base member 72 to move the mechanical splice 40 to the closed position, the movable member driving portion (projection) 132 is substantially simultaneously moved to the first movable member 86. The first movable member 86 is moved from the operating position to the non-operating position.

  The stop part 134 includes a part of the operation member 136 of the splice operation part 130 and a part of one side plate part 108 (on the side close to the operation member 136) of each of the pair of second movable members 104. Is done. When the operating member 136 is moved from the non-operating position to the operating position when at least one second movable member 104 is in the non-operating position, the surface 136a of the operating member 136 is moved to the upper surface 72a of the base member 72 during the movement. At a substantially orthogonal position, a part of the operation member 136 collides with a part of one side plate portion 108 of the movable member 104, and further rotation movement of the operation member 136 toward the operation position is prevented. As a result, the operation of the splice operation unit 130 for moving the mechanical splice 40 from the open position to the closed position, and the operation of the movable member drive unit 132 for moving the first movable member 86 from the operating position to the non-operating position. However, both are blocked by the stop portion 134 (the operation member 136 and the side plate portion 108). The stop unit 134 operates the splice operation unit 130 for operating the mechanical splice 40 from the open position to the closed position only when both of the pair of second movable members 104 are in the operating position, and the first It is desirable that the operation of the movable member drive unit 132 for moving the movable member 86 from the operating position to the non-operating position is allowed.

  According to the above configuration, the optical fiber core of the pair of optical transmission line units 12 (or 14) in the state where the second movable member 104 of at least one of the deflection forming portions 84 is in the non-operating position (therefore, the connection preparation state). In a state before adjusting the amount of deflection of the line 20 (or 28) into the predetermined deflection range with respect to the intermediate portion 20b (or 28b), the mechanical splice 40 is moved from the open position by the operation member 136 of the splice operation unit 130. It becomes impossible to move to the closed position, and the first movable member 86 cannot be moved from the operating position to the non-operating position by the movable member driving portion (projection) 132. Therefore, before the optical fibers 16 (or 24) are permanently connected to each other by the mechanical splice 40, the amount of deflection within a predetermined deflection range with respect to the intermediate portion 20b (or 28b) of the optical fiber core wire 20 (or 28) is reduced. Since adjustment is forced, it is possible to more reliably prevent a signal transmission loss caused by excessive deflection in the pair of optical fibers 16 (or 24) connected optically.

Next, an example of an optical connection method using the illustrated optical transmission line connection device 10 will be described with reference to FIGS. 4, 5, and 11 to 16.
As a preliminary operation, the optical transmission line unit 12 or 14 to be connected is subjected to the removal of the core wire and the fiber cutting to form the end region 20a or 28a having a predetermined length of the optical fiber core wire 20 or 28. . The optical transmission line connecting device 10 supports the mechanical splice 40 in the open position on the splice support portion 44 in an appropriate posture, and removes the pair of holders 42 without supporting them on the holder support portion 46. In addition, the first movable member 86 is disposed at the operating position, while the second movable member 104 and the splice operation unit 130 are disposed at the non-operating position. As a result, the splice retainer 128 holds the mechanical splice 40 in a stationary state on the splice support 44 (FIG. 12).

  In the optical transmission line unit (optical cable) 12, first, the core wire housing member (insulation jacket) 22 is removed over the required length at the end to expose the optical fiber core wire 20 (FIG. 4A). The end portion 22a of the core housing member 22 from which the optical fiber core 20 protrudes is fitted into the recess 62 of the pressing holding portion 56 of the holder 42 with the lid portion 60 in the open position (FIG. 4B), and then The lid 60 is hooked at the closed position, and the holder 42 is attached to the optical transmission line unit 12 (FIG. 4C). For the optical transmission line unit 12 to which the holder 42 is attached, for example, by manually using a dedicated tool (not shown), the coating 18 in the exposed end region of the optical fiber 20 is removed over a predetermined length. Then, the optical fiber 16 is exposed (FIG. 4C). Furthermore, the optical fiber 16 exposed in the tip region of the optical fiber core wire 20 is cut into a predetermined length by, for example, a manual operation using another dedicated tool (not shown) (FIG. 4C). Thereby, the end region 20a having a predetermined length is formed.

  In the optical transmission line unit 14, first, the optical fiber core wire 28 is inserted into the boot portion 38 and the core wire gripping portion 34 of the core wire housing member 30 (FIG. 5A), and required from the end of the optical fiber core wire 28. The core wire accommodation member 30 is disposed at the position of the length (FIG. 5B). The core wire gripping portion 34 of the core wire housing member 30 from which the optical fiber core wire 28 of the required length protrudes is fitted into the recess 62 of the pressing holding portion 56 of the holder 42 with the lid portion 60 in the open position (FIG. 5). (C)) Next, the lid 60 is hooked at the closed position, and the holder 42 is attached to the optical transmission line unit 14 (FIG. 5D). For the optical transmission line unit 14 to which the holder 42 is attached, for example, by manually using a dedicated tool (not shown), the exposed coating 26 in the tip region of the optical fiber core 28 is removed over a predetermined length. Then, the optical fiber 24 is exposed (FIG. 5D). Further, the optical fiber 24 exposed in the tip region of the optical fiber core wire 28 is cut into a predetermined length by, for example, a manual operation using another dedicated tool (not shown) (FIG. 5D). As a result, a terminal region 28a having a predetermined length is formed.

  The illustrated optical transmission line connection device 10 connects a pair of optical transmission line units 12, a pair of optical transmission line units 14, and a connection between the optical transmission line unit 12 and the optical transmission line unit 14. Can be implemented. Hereinafter, a connection operation between a pair of optical transmission line units 12 will be described as an example.

  In the above-described core wire sheath removal and fiber cutting step, for example, by using the jig 144 shown in FIG. 11, the end regions 20a having different lengths can be formed in the optical transmission line unit 12 with the same tool. The jig 144 has a recess 146 that can receive the holder 42 and a required length portion before and after the holder 42 of the optical transmission path unit 12 to which the holder 42 is attached in a linearly extended form. The recess 146 includes a holder receiving portion 148 that receives the holder 42 so as to be movable over a predetermined distance in the longitudinal direction. In the core wire sheath removal step, the required length portions of the holder 42 and the optical transmission line unit 12 are fitted into the recess 146, and the front end surface 42a of the holder 42 from which the optical fiber core wire 20 is projected is attached to the holder receiving portion 148. The optical transmission line unit 12 is disposed at the front end position on the jig 144 in contact with the front end surface 148a (FIG. 11A). While holding the optical transmission line unit 12 at the front end position, the coating 18 of the optical fiber core wire 20 is located on the distal side of the predetermined position P (distance p from the outer front end 144a) with reference to the outer front end 144a of the jig 144. And the optical fiber 16 is exposed.

  In the fiber cutting step, the optical fiber 16 is held at a predetermined position Q (distance q (> p) from the outer front end 144a) with reference to the outer front end 144a of the jig 144 while holding the optical transmission line unit 12 at the front end position. Disconnect. As a result, the end region 20a having the fiber exposed length at the distance (qp) between the PQs is formed. Alternatively, the rear end face 42b of the holder 42 from which the core wire accommodating member 22 is projected from the front end position on the jig 144 is the holder of the optical transmission path unit 12 from which the coating has been removed at the predetermined position P prior to the fiber cutting. It moves to the rear end position where it comes into contact with the rear end surface 148b of the receiving portion 148 (FIG. 11B). In the fiber cutting step, the optical transmission path unit 12 is held at the rear end position, and at a predetermined position Q (distance q (> p) from the outer front end 144a) with respect to the outer front end 144a of the jig 144, The fiber 16 is cut. As a result, the end region 20a is formed in which the length obtained by adding the moving distance of the holder 42 in the holder receiving portion 148 to the distance (qp) between the PQs is the fiber exposure length.

  The pair of optical transmission line units 12 in which the core wire sheath removal and the fiber cutting step have been completed are attached to the optical transmission line connection device 10 so that the holder 42 is supported in a proper posture by the corresponding holder support 46. At this time, the holder 42 is moved from each longitudinal end of the base member 72 while the optical fiber 16 exposed at the end of each optical transmission line unit 12 is guided along the guide passage 90 of the first movable member 86 at the working position. It inserts into the recess 80 of the holder support part 46 along the central axis 72b (FIG. 12). The optical fiber 16 of each optical transmission line unit 12 is guided into the guide passage 90 of the first movable member 86 and smoothly inserted into the fiber insertion hole 54 of the mechanical splice 40 supported by the splice support portion 44. When the holder 42 is properly disposed on the holder support 46 and is hooked by the elastic arm 82 and the first protrusion 125, the optical fiber 16 is in the two blade portions 50a of the fixing member 50 of the mechanical splice 40 in the open position (see FIG. 6).

  When both of the pair of optical transmission line units 12 are attached to the optical transmission line connection device 10 according to the above-described procedure, the inside of the mechanical splice 40 in the open position when the respective holders 42 are properly arranged on the holder support 46. Thus, the ends of the pair of optical fibers 16 are abutted with each other, and both optical transmission line units 12 are placed in a connection ready state. At this time, the intermediate portion 20b of the optical fiber core wire 20 of each optical transmission line unit 12 extending between the mechanical splice 40 and the holder 42 is brought into contact with the contact surface 92 of the first movable member 86, so that a predetermined value is obtained. The state in which the minimum bending within the bending range is generated is maintained (FIG. 13).

  In both optical transmission line units 12, when the length of the end region 20a of the optical fiber core wire 20 obtained by the above-described core wire sheath removal and fiber cutting step is the lower limit value within the allowable range, In the state where the optical fibers 16 of the path unit 12 are in contact with each other, the intermediate portion 20b of the pair of optical fibers 20 contacts the contact surface 92 of the corresponding first movable member 86 at the operating position. To produce a minimum deflection R1. On the other hand, when the length of the terminal region 20a of at least one of the optical fiber cores 20 is larger than the lower limit within an allowable range, at least one of the optical fibers 16 is brought into contact with each other by abutting the ends of the pair of optical fibers 16. The intermediate portion 20b of the core wire 20 is separated from the contact surface 92 of the first movable member 86, and a deflection R2 larger than the minimum deflection R1 is generated within a predetermined deflection range (FIG. 14A). In the latter case, the bending amounts of the pair of intermediate portions 20b are not necessarily equal, and an unintended imbalance may occur.

  Next, the second movable member 104 is moved from the non-operating position to the operating position and hooked to the base member 72 (FIG. 14B). Here, due to the butting of the ends of the pair of optical fibers 16 in the mechanical splice 40, the optical fiber core wire 20 of at least one of the optical transmission line units 12 has a maximum deflection R3 within a predetermined deflection range in the intermediate portion 20b. If this occurs, the intermediate portion 20 b is received in the guide groove 112 of the second movable member 104 and abuts against the abutment surface 114.

  In both optical transmission line units 12, the length of the end region 20a of the optical fiber core wire 20 obtained by the core wire sheath removal and the fiber cutting step is close to the upper limit value within the allowable range. When the tips of the optical fibers 16 are abutted, the optical fiber core wire 20 of any one of the optical transmission line units 12 may cause a bending R4 exceeding a predetermined bending range in the intermediate portion 20b. In this case, by arranging the second movable member 104 at the operating position, the guide groove 112 receives the intermediate portion 20b of the optical fiber core wire 20, and the contact surface 114 applies a pressing force to the intermediate portion 20b. Thus, the excessive deflection R4 of the intermediate portion 20b is reduced to the maximum deflection R3 within the predetermined deflection range (FIG. 14C). This reduction amount (R4-R3) of bending is given to the intermediate portion 20b of the other optical fiber core wire 20 that does not cause excessive bending R4, and increases the bending of the other intermediate portion 20b. As a result, the bending of the intermediate portion 20b of both optical fiber core wires 20 is substantially balanced within a predetermined bending range.

  When the lengths of both end regions 20a of the pair of optical fiber cores 20 are the upper limit values within the allowable range, both of the intermediate portions 20b of the optical fiber core wires 20 are in the second movable member 104. Is brought into contact with the contact surface 114, and the maximum deflection R3 within a predetermined deflection range is generated. Note that the excessive bending R4 of the optical fiber cores 20 in both the optical fiber cores 20b is caused by the fact that the length of the end region 20a of the optical fiber core wire 20 obtained by the core wire sheath removal and the fiber cutting step is within an allowable range. This means that the optical transmission line unit 12 is not optically connected.

  When both of the pair of second movable members 104 are arranged at the working position, both of the pair of optical transmission line units 12 are bent in a predetermined bending range in the intermediate portion 20b of the optical fiber core wire 20, The connection preparation state is set (FIGS. 15A and 16A). In this state, the stop portion 134 (the operation member 136 of the splice operation unit 130 and the side plate portion 108 of the second movable member 104) is in the closed position because the both movable members 104 are in the operating position. The operation of the splicing operation unit 130 for moving the first movable member 86 to move to the non-operation position is permitted.

  Therefore, the operating member 136 is rotated from the non-operating position to the operating position (FIG. 15 (b)) and latched at the operating position (FIG. 15 (c)). As a result, a pressing force is applied from the operating member 136 to the operating member 52 of the mechanical splice 40, the mechanical splice 40 shifts from the open position to the closed position, and the pair of optical fibers 16 are permanently connected in a state where the ends are butted. . Moreover, the movable member drive part (protrusion) 132 provided on the operation member 136 presses the top surfaces of the pair of first movable members 86, respectively, so that the first movable members 86 are not actuated from the operation position. The position is moved (FIG. 16B). When the movable member driving unit 132 moves the first movable member 86 to the non-operating position, the intermediate portion 20b of the optical fiber core wire 20 is separated from the abutment surface 92 of the first movable member 86 to bend a predetermined amount. It is stretched in an unconstrained state in the space between the mechanical splice 40 and the holder 42 while ensuring at least the minimum deflection within the range. In this way, the optical connection between the optical transmission line units 12 using the optical transmission line connection device 10 is completed. The movement of the first movable member 86 to the non-operating position by the movable member driving unit 132 is simultaneous with the permanent connection between the pair of optical fibers 16 due to the closing movement of the mechanical splice 40 or more than the permanent connection. It is desirable that the process is performed with a slight delay from the viewpoint of securing a deflection within a predetermined deflection range in both intermediate portions 20b of the pair of optical fiber cores 20 after the optical connection.

  17 and 18 show an optical transmission according to a modification in which a first movable member 86 ′ that moves linearly between an operating position and a non-operating position is used in place of the rotary first movable member 86. The road connection apparatus 10 is shown. The first movable member 86 ′ is disposed at the operating position with the bottom surface 86 a spaced apart substantially parallel to the top surface 72 a of the base member 72 (FIG. 18A), and at the non-operating position, the bottom surface 86 a is the base member. It is arranged close to (or in contact with) the substantially upper surface 72a of 72 (FIG. 18B). Instead of the support shaft 100, the base member 72 is provided with a guide structure 150 that linearly guides the first movable member 86 ′ in a direction substantially orthogonal to the upper surface 72 a of the base member 72. The direct-acting first movable member 86 ′ is in contact with the intermediate portion 20 b of each of the pair of optical fiber core wires 20 in the connection ready state in the operating position, like the rotary first movable member 86. Thus, the minimum deflection in the predetermined deflection range can be generated in the intermediate portion 20b. Similarly to the rotary first movable member 86, the direct-acting first movable member 86 ′ is driven by the movable member driving unit 132 (FIG. 16) provided in the splice operation unit 130 to act. Can move from position to non-acting position.

  19 and 20 include a first movable member 86 ′ that moves linearly between an operating position and a non-operating position in place of the rotary first movable member 86, and a rotary first movable member 86 ′. An optical transmission line connection device 10 according to another modified example including a second movable member 104 ′ that moves linearly between an operation position and a non-operation position instead of the second movable member 104 is shown. The second movable member 104 ′ is located at the operating position, and the upper plate portion 106 is disposed substantially parallel to and close to the upper surface 72 a of the base member 72 (FIG. 20B). 106 is spaced apart from and substantially parallel to the upper surface 72a of the base member 72 (FIG. 20A). Instead of the support shaft 120, the base member 72 guides the second movable member 104 ′ in a direction substantially orthogonal to the upper surface 72 a of the base member 72 and latches at a working position and a non-working position. Is provided. Similarly to the rotary second movable member 104, the direct-acting second movable member 104 ′ contacts the intermediate portion 20b of each of the pair of optical fiber core wires 20 in the connection preparation state in the operating position. Thus, the maximum deflection in the predetermined deflection range can be generated in the intermediate portion 20b.

  21 and 22 show a first movable member 86 ′ operating linearly between an operating position and a non-operating position in place of the rotary first movable member 86 and the second movable member 104. A splicing operation portion having a second movable member 104 ′ and having an operation member 136 that linearly moves between an operation position and a non-operation position instead of the splice operation portion 130 having a rotary operation member 136. An optical transmission line connecting device 10 according to still another modification including 130 ′ is shown. The splicing operation portion 130 ′ is in the operating position, and the operating member 136 is disposed substantially parallel to and close to the upper surface 72 a of the base member 72 (FIG. 22A), and in the non-operating position, the operating member 136 is the base member. 72, and spaced apart from and substantially parallel to the upper surface 72a of 72 (FIG. 22B). Similarly to the splice operation unit 130 having the rotary operation member 136, the splice operation unit 130 ′ having the direct acting operation member 136 shifts the mechanical splice 40 to the closed position in the operating position and also operates the operation member 136. The first movable member 86 ′ is moved to the non-operating position by the movable member driving unit 132 provided in the first position.

  In this modification, the second movable member 104 ′ is moved from the non-operating position to the operating position in conjunction with the operation of moving the operating member 136 ′ of the splice operating unit 130 from the non-operating position to the operating position. can do. Thereby, the man-hour of the optical connection work using the optical transmission line connection device 10 can be reduced. In this case, as shown in FIG. 22, instead of providing the second movable member 104 ′ with the protruding wall 110 (FIG. 20) having the guide groove 112 and the contact surface 114, the operation member 136 has the same guide groove. A protruding wall 154 having 112 and abutment surface 114 may be provided. Then, by forming the movable member driving portion (projection) 132 sufficiently smaller than the projecting wall 154, the operation member 36 exhibits a function equivalent to the function of the second movable member 104 described above, and the mechanical splice 40. Before the permanent connection between the optical fibers 16 is performed, the amount of deflection of the intermediate portion 20b of the optical fiber core wire 20 within the predetermined deflection range can be adjusted.

DESCRIPTION OF SYMBOLS 10 Optical transmission line connection apparatus 12, 14 Optical transmission line unit 16, 24 Optical fiber 20, 28 Optical fiber core wire 22, 30 Core wire accommodating member 40 Mechanical splice 42 Holder 44 Splice support part 46 Holder support part 72 Base member 84 Deflection Forming portion 86 First movable member 90 Guide passage 92 Contact surface 100 Support shaft 104 Second movable member 112 Guide groove 114 Contact surface 124 Holder pressing portion 128 Splice pressing portion 130 Splice operation portion 132 Moving member driving portion 134 Stop Part 144 Jig

Claims (9)

Optical transmission line connecting device for connecting a pair of optical transmission line units each having an optical fiber core wire coated with an optical fiber and a core wire housing member that at least partially accommodates the optical fiber core wire to each other In
A mechanical splice operable between an open position for receiving a pair of optical fibers and a closed position for sandwiching and connecting the optical fibers;
A pair of holders for holding a pair of core wire accommodating members,
A splice support for supporting the mechanical splice at a predetermined position;
A pair of holder support portions for supporting each of the pair of holders in a predetermined position so that the pair of holders are linearly aligned with respect to the mechanical splice supported by the splice support portion;
A pair of optical fibers, the coatings of which are partially removed in the end regions of the pair of optical fiber cores, are received in the end-butted state by the mechanical splice in the open position supported by the splice support, When the pair of core wire accommodating members are respectively held by the pair of holders supported by the pair of holder support portions at portions where the end regions of the optical fiber core wires protrude outward, the light beams A pair of flexure forming portions for flexing an intermediate portion extending between the mechanical splice and the pair of holders in a distal end region of a fiber core wire within a predetermined flexure range;
Each of the pair of bending forming portions contacts the intermediate portion of each of the pair of optical fiber cores to cause a minimum bending in the bending range in the intermediate portion, and does not contact the intermediate portion. Providing a first movable member movable between a non-acting position;
An optical transmission line connection device.   Each of the pair of bending forming portions is a second movable member operable independently of the first movable member, and is in contact with the intermediate portion of each of the pair of optical fiber core wires. 2. The optical transmission line connection according to claim 1, further comprising: a second movable member that is movable between an operation position that causes the maximum deflection in the deflection range in the intermediate portion and a non-operation position that does not contact the intermediate portion. apparatus.   The operation of the splice operation part that moves the mechanical splice supported by the splice support part from the open position to the closed position, and the operation of the splice operation part that operates the mechanical splice causes the first movable member to act. A movable member driving unit that operates to move from a position to the non-operating position; and when the second movable member is in the non-operating position, the operation of the splice operating unit and the movable member driving unit The optical transmission line connection device according to claim 2, further comprising a stop unit that prevents operation.   4. The optical transmission according to claim 2, further comprising a splice pressing portion that holds the mechanical splice in a stationary state on the splice support portion when the second movable member is in the non-operating position. 5. Road connection device.   3. A holder pressing portion that further holds each of the pair of holders in a stationary state on each of the pair of holder support portions when the second movable member is in the operating position. 5. The optical transmission line connection device according to claim 4.   The second movable member is provided with a guide groove for preventing meandering of the intermediate portion between the mechanical splice supported by the splice support portion and the holder supported by the holder support portion, and provided in the guide groove. 6. The optical transmission line connection device according to claim 2, further comprising an abutting surface that abuts against the intermediate portion at the operating position and causes the maximum deflection to occur in the intermediate portion.   The first movable member has a guide path for guiding an optical fiber toward the mechanical splice supported by the splice support when the holder holding the core wire accommodating member is disposed on the holder support. The light according to claim 1, further comprising: a contact surface provided in the guide passage and abutting against the intermediate portion at the operating position to cause the minimum deflection in the intermediate portion. Transmission line connection device.   A base member having the splice support portion and the pair of holder support portions is further provided, and the first movable member can be rotated or translated between the operating position and the non-operating position. The optical transmission line connection device according to claim 1, wherein the optical transmission line connection device is installed on a member.   The base member further includes a base member having the splice support part and the pair of holder support parts, and the second movable member is capable of rotating or translating between the operating position and the non-operating position. The optical transmission line connection device according to claim 2, wherein the optical transmission line connection device is installed on a member.

Images