WO2004062331A1 - Transmission line unit being mounted on communication apparatus - Google Patents

Abstract

A transmission line unit being mounted on a communication apparatus and incorporating a section for connecting a first transmission line extended from the inside of the communication apparatus with a second transmission line provided on the outside of the communication apparatus, characterized in that the section for connecting the transmission line is drawn out to the front side of the transmission line unit while sliding on the inside thereof.

Description

 Transmission unit mounted on communication equipment

 The present invention relates to a transmission path unit mounted on a communication device, and in particular, connects a transmission path mounted on the communication device and provided inside the communication device to a transmission path provided outside the communication device. The present invention relates to a transmission path unit having a connection part therein. Background art

 In recent years, the development of wavelength division multiplexing (WDM) has been promoted with the increase in transmission capacity, speed, and distance in optical communications. . In such an optical transmission system based on the WDM method, a higher output of an optical fiber unit mounted on an optical transmission device is required to cope with a longer transmission capacity. Therefore, in order to respond to the high output of the optical fiber unit with reliability, the pump light and the source of the optical fiber unit are mounted on another unit, the pump unit.

 Normally, a plurality of pumping units are connected to an optical fiber unit via an optical fiber.However, if a failure occurs in one of the powerful pumping units, the optical fiber unit is connected to the optical transmission unit. Without pulling out, the optical fiber connected to the failed pumping unit must be connected to the spare pumping unit during operation of the optical transmission equipment. In other words, if the optical fiber unit is pulled out of the optical transmission device, the communication line is automatically disconnected, so that the optical fiber unit is not pulled out from the optical transmission device, and It is necessary to replace the optical fiber connected to the pump unit.

FIGS. 1A and 1B are diagrams for explaining the structure of a conventional optical fiber unit, wherein FIG. 1A is a front view, and FIG. 1B is a side view of FIG. The conventional optical fiber unit 10 shown in FIG. 1 is mounted inside a shelf of an optical transmission device not shown. Referring to FIG. 1, the optical fiber unit 10 includes a printed wiring board 11, a locking mechanism 12 provided on a front edge of the printed wiring board 11, and a rear end of the printed wiring board 11. It is roughly composed of a connector 13 provided, a surface plate 14 attached to the front of the printed wiring board 11, and a metal optical fiber mounting plate 15 attached to the printed wiring board 11.

 Print Rooster Β / 镍 板 1 1 has many electronic components. When the printed wiring board 11 is inserted into the shelf of the optical transmission device, the connector 13 is plugged in with the connector provided inside the shelf, and is locked to the shelf by the locking mechanism 12 Is done.

 The optical fiber mounting plate 15 includes an internal optical fiber 16 extending from the inside of the optical transmission device and an external optical fiber 1 introduced from outside the optical transmission device, such as an excitation unit (not shown). An optical adapter mounting plate 19 for screwing a plurality of optical adapters 18 for connecting the optical adapters 7 to each other is mounted. An internal optical fiber connector 16-1 is provided at the end of the internal optical fiber 16 and an external optical fiber connector 17-1 is provided at the end of the external optical fiber 17. I have. The internal optical fiber 16 and the external optical fiber 17 are connected by inserting the internal optical fiber connector 16-1 and the external optical fiber connector 17-1 into the optical adapter 18. You.

 A substantially rectangular cutout portion 14-1 is formed inside the surface plate 14. An external optical fiber 17 is bundled and attached to the upper part of the cutout part 14-1. During the operation of the optical transmission measures, the cover member (not shown) is screwed to cover the notch 1313-4-1.

As shown in FIG. 11A, the internal optical fiber 16 and the external optical fiber 17 inserted into the optical adapter 18 are perpendicular to the optical adapter mounting plate 19 (see FIG. The plurality of optical adapters 18 are closely attached to the optical adapter mounting plate 19 in the lateral direction (the horizontal direction in FIG. 11 (a)) so as to be positioned in the vertical direction in FIG. Since FIG. 11 (b) is a side view of FIG. 1- (a) viewed from the direction of arrow A, the optical adapter 18, the internal optical fiber 16 and the external optical fiber 17 are not shown. Only one of each is shown. When attaching or detaching the external optical fiber 17 or the like, the cover member is removed as shown in FIG. 1, and a finger is inserted into the cutout 14-1, and the optical adapter 18 is operated.

 However, in the above-described conventional structure, a certain range of operation space is secured in the optical fiber unit 10 because the optical adapter 18 is operated through the cutouts 14-11 using a finger. Must.

 That is, if the optical adapter 18 is provided on the depth side (the right-hand side in FIG. 11 (b)) of the optical fiber unit 10, it is difficult to easily perform the attachment / detachment operation with a finger. A plurality of optical adapters 18 are provided on the front side of the optical fiber unit 10 as shown in FIG. 11 (b). However, in such a structure, an area long enough to dispose the optical fiber 10 must be provided in the direction in which the optical adapter 18 is mounted on the optical adapter mounting plate 19 (the left-right direction in FIG. 11A). I have to. Therefore, the dimension of the optical fiber unit 10 in the width direction (the left-right direction in FIG. 1 _ (a)) becomes large.

 Therefore, if the operation space for the optical adapter 18 is secured in the optical fiber unit 10 under such a structure, the optical fiber unit 10 is oversized, and the optical fiber is restricted to the space where optical transmission measures are limited. It is difficult to mount the unit 10. Further, as shown in FIG. 11 (a), in order to reduce the size of the optical fiber unit 10 in the lateral width direction (the left-right direction in FIG. 1- (a)), a plurality of optical adapters 18 are placed at a distance from each other. If they are narrow and closely arranged, it is difficult to insert and remove the external optical fiber 17 and the like in the optical adapter 18. Therefore, the conventional structure cannot operate the optical adapter 18 efficiently.

 In addition, Japanese Patent Application Laid-Open Publication No. Hei 4-336125 discloses an optical fiber extra length processing device that absorbs slack of an optical fiber and gives an appropriate tension. · Japanese Patent Application Laid-Open No. 5-303018 discloses that the extra length of the optical fiber in the optical cable terminal can be extended by adjusting the extra length of the optical fiber. The power to disclose the processing mechanism The above problems have not been solved. Disclosure of the invention

In view of the above-mentioned problems, an object of the present invention is to provide a communication device such as an optical fiber unit. A structure that enables the transmission path unit mounted on the device to be small-sized, and improves the operability of attaching and detaching a transmission path such as an optical fiber to and from the transmission path unit. To provide the transmission path unit.

 More specifically, an object of the present invention is to provide a first transmission path mounted on a communication device and extending from an internal power of the communication device, and a second transmission path introduced from outside the communication device. In the transmission path unit having a transmission path connection section for connecting the transmission path unit, the transmission path connection section is drawn out to the front side of the transmission path unit by sliding inside the transmission path unit. This is achieved by the characteristic transmission path unit.

 The first transmission path is wound inside the transmission path unit to form a winding circle, and the transmission path changes the radius of the winding circle in synchronization with the sliding of the transmission path connecting portion. It may further include a variable length means.

 Further, the transmission path length variable means includes: a housing that houses the first transmission path that forms the winding circle; and a connection member that connects the transmission path connection unit and the housing. When the transmission path connecting part moves, the container may move via the connecting member, and the radius of the winding circle may change. Further, the transmission path length varying means may further include an elastic member connected to the container for suppressing a change in the radius of the winding circle. BRIEF DESCRIPTION OF THE FIGURES

 Other objects, features and mi points of the present invention will become more apparent by reading the following detailed description with reference to the accompanying drawings.

 FIG. 1 is a diagram for explaining the structure of a conventional optical fiber unit.

 FIG. 2 is a front view of an optical transmission device 30 including the optical fiber unit 20 according to the present invention.

 FIG. 3 is a diagram for explaining the structure of the optical fiber unit 20 according to the present invention.

FIG. 4 is a view showing a state in which the optical adapter mounting plate 50 shown in FIG. 3 is pulled out toward the front surface of the optical fiber unit 20. FIG. 5 is a cross-sectional view schematically showing the structure of the wire introduction part 300.

 FIG. 6 is a side sectional view schematically showing the structure of the optical fiber length variable structure 200-1. BEST MODE FOR CARRYING OUT THE INVENTION

 An embodiment of the present invention will be described with reference to FIGS. Hereinafter, an optical transmission device will be described as an example of a communication device, and an optical fiber unit will be described as an example of a transmission path unit.

 FIG. 2 is a front view of an optical transmission device 30 including the optical fiber unit 20 according to the present invention.

 Referring to FIG. 2, an optical fiber unit 20 according to the present invention is mounted inside a shell 31 of an optical transmission device 30 having a plurality of plug units 40 mounted thereon. FIG. 2 shows a state before attachment / detachment of the later-described external optical fiber 27 (see FIG. 3) or the like, that is, a state during normal operation of the optical transmission device 30.

 In the strong state, the cover member 21 is screwed and attached to the substantially rectangular cutout portion 2411 (see FIG. 3) formed inside the surface plate 24. During the normal operation of 30, a third party is prevented from removing the external optical fiber 27 (see Fig. 3) and other operations.

 FIGS. 3A and 3B are diagrams for explaining the structure of the optical fiber cutout 20 according to the present invention. FIG. 3A is a front view, and FIG. 3B is a side view of FIG. is there. FIG. 3 shows a state in which the force par member 21 has been removed from the optical fiber unit 20 for convenience of explanation. FIG. 4 is a diagram showing a state where the optical adapter mounting plate 50 shown in FIG. 3 is pulled out toward the front.

 Referring to FIGS. 3 and 4, the optical fiber unit 20 includes a printed wiring board 21, a locking mechanism 22 provided at a front edge of the printed wiring board 21, and a printed wiring board 21. The connector part 23 provided at the rear end of the board, the surface board 24 attached to the front of the printed rooster Bi ^ board 21 and the metal optical fiber mounting board attached to the printed wiring board 21 It is roughly composed of 25 mag.

A large number of electronic components are mounted on the printed wiring board 21. Printed wiring board 2 When 1 is inserted into the shelf 31 (see FIG. 2) of the optical transmission device 30 (see FIG. 2), the connector section 23 is plugged in with the connector provided inside the shelf 31. It is locked to the shelf 31 by the locking mechanism 22.

 The optical fiber mounting plate 25 has an optical adapter mounting plate 50 mounted on the left side in FIG. 3B. The optical adapter mounting plate 50 has an internal optical fiber 26 (a thin transmission line shown in FIGS. 3 and 4) as a first transmission path extending from the inside of the optical transmission device 30. A plurality of optical adapters 28 are connected by screws to connect the optical transmission device 30 with an external optical fiber 27 as a second transmission path attached from the outside of the optical transmission device 30. A transmission path connecting portion is constituted by the optical adapter 28, the optical adapter mounting plate 50, and the like.

 The optical adapter mounting plate 50 is formed by bending, and has a substantially L-shape when the optical fiber unit 20 is viewed from above in FIG. The plurality of optical adapters 28 described above are screwed to the optical adapter mounting surface 50-1, which is provided perpendicular to the optical fiber mounting plate 25, of the surface of the optical fiber mounting plate 50. I have. More specifically, as shown in FIG. 3 (a), the optical adapter 28 is oriented in a vertical direction with respect to the optical adapter mounting surface 50-1 of the optical adapter mounting plate 50 (see FIG. 3). (In the vertical direction). The optical adapters 28 are provided only in two rows in the horizontal direction (the left-right direction in FIG. 3A) with respect to the optical adapter mounting surface 50-1. Therefore, unlike the conventional technology, the optical adapter 18 can be mounted in a small space in the lateral direction (the horizontal direction in FIG. 3A) with respect to the optical adapter mounting surface 50-1.

 An inner optical fiber connector 26-1 is provided at an end of the inner optical fiber 26, and an outer optical fiber connector 27-1 is provided at an end of the outer optical fiber 27. I have. By inserting the internal optical fiber connector part 26-1 and the external optical fiber connector part 27-1 horizontally into the optical adapter 28 (left and right in Fig. 3 (b)), The optical fiber 26 and the external optical fiber 27 are connected.

Among the surfaces of the optical adapter mounting plate 50, the sliding surface 50-2, which is the surface to be mounted on the optical fiber mounting plate 25, has the following structure, and has the following structure. It is possible to slide in the substantially rectangular cutout portion 24-1 formed inside the front plate 24 in the front direction, that is, in the direction indicated by the arrow C in FIG. 3.

 Specifically, the sliding surface 50-2 of the optical adapter mounting plate 50 slides in the sliding direction of the optical adapter mounting plate 50 (the left-right direction in FIG. 3 (b)). A groove forming portion 55 is formed. A sliding shaft having a shape in which the lower side of the sliding groove forming portion 55 is depressed is provided at an end of the sliding groove forming portion 55 on the far side (the right side in FIG. 3B). A compartment housing 56 is formed.

 A bar-shaped hook member 59 formed by bending a metal fitting is provided below the optical adapter mounting plate 50. The hook member 59 allows the external optical fiber 27 to be easily operated when the optical adapter mounting plate 50 is pulled out in the direction indicated by arrow C in FIG.

 The optical fiber mounting plate 25 is provided with a sliding shaft portion 57 protruding rightward in FIG. 3A, that is, in a direction substantially perpendicular to the sliding direction of the optical adapter mounting plate 50. ing.

 Therefore, the optical adapter mounting plate 50 can be pulled out in the front direction (the direction shown by the arrow C) by sliding the sliding groove forming portion 55 with respect to the sliding shaft portion 57, and the hook member 59 Is inserted into a fixed screw locking portion 61 described later, and the sliding power S is stopped. When the sliding is stopped, it is necessary to lift the hook member 59 above the fixed screw engaging portion 61 and pull it out in the front direction (the direction indicated by the arrow C). When the shaft 57 comes into contact with the inside of the sliding shaft housing 56, it is lifted up by using the cutout of the sliding shaft housing 56.

 FIG. 4 shows a state where the optical adapter mounting plate 50 is pulled out toward the front of the optical fiber unit 20 in this manner. As shown in FIG. 4, by pulling out the optical adapter mounting plate 50 in the front direction of the optical fiber unit 20 (the direction indicated by arrow C in FIG. 3— (b)), the optical adapter mounting plate 50 in FIG. An operation area for operating the optical adapter 28 can be secured on the right side of the optical fiber unit 20.

A fixed screw portion 60 and a fixed screw locking portion 61 are provided below the optical adapter mounting plate 50 and on the front side of the optical fiber unit 20. Therefore, The optical adapter mounting plate 50 is fixed to the optical fiber unit 20 during normal operation of the optical transmission device 30 (see FIG. 1) by screwing the fixing screw portion 60 into the fixing screw locking portion 61. Have been.

 In this way, the plurality of optical adapters 28 are arranged vertically (see FIG. 3-(b)) so that the inner optical fiber 26 and the outer optical fiber 27 are inserted in the horizontal direction (left and right in FIG. 3B). 3 in the vertical direction). Therefore, the space in the optical fiber unit 20 for providing the optical adapter unit 28, particularly, the width in the horizontal direction (the left and right direction in FIG. 3A) can be reduced. It is possible to realize a small size of 0. For example, the width of the optical fiber unit 10 in the lateral direction (the left-right direction in FIG. 11A) in the related art is about 112 mm, but in the embodiment of the present invention, this is about 72 mm. mm.

 Moreover, the optical adapter mounting plate 50 on which the optical adapter 28 is mounted can be easily pulled out by sliding in the front direction of the optical fiber unit 20, that is, in the direction indicated by the arrow C in FIG. Therefore, when attaching and detaching the external optical fiber 27, the optical unit 20 is not pulled out from the shelf 31 (see Fig. 2), and the optical adapter mounting plate with a plurality of optical adapters 28 is screwed. It is possible to create a state in which the optical adapter 28 can be operated only by sliding 50 from the notch 24_1. Further, after the operation of the optical adapter 28, the optical adapter mounting plate 50 is moved and pushed to the rear side to be housed in the optical fiber unit 20. Therefore, the optical adapter 28 can be operated more easily than in the past.

 By the way, simply moving the optical adapter mounting plate 50 in the direction indicated by the arrow C in FIG. 3 (b) causes the internal optical fiber 26 to be pulled, generating more tension than necessary. However, the internal optical fiber 26 may be damaged. Also, if the optical adapter mounting plate 50 is simply moved in the direction opposite to the direction indicated by the arrow C in FIG. 3 (b), the internal optical fiber 26 is pushed in, the optical fiber 26 is loosened and the optical fiber There is a possibility that the internal optical fiber 26 may be damaged by being hooked on a structure constituting the internal structure of the knit 20.

In order to prevent the occurrence of these states, in this embodiment, the transmission path described below is used. Employs variable length means. The transmission path length varying means is roughly composed of a wire 70 described later, an optical fiber length varying structure 200-1 to 200-4, and the like.

 In the upper right part of the optical fiber mounting plate 25 shown in FIG. 3 (b), an optical fiber length variable structure support plate 100 having a substantially square shape is connected to the optical fiber via a columnar spacing tube (not shown). It is provided so as to be superimposed on the surface of the mounting plate 25. The spacing tubes (not shown) are provided, for example, at the four corners of the optical fiber length variable structure support plate 100. Therefore, a space corresponding to the length of the spacing tube is formed between the optical fiber mounting plate 25 and the optical fiber length variable structure support plate 100.

 In the surface of the support plate 100 of the optical fiber length variable structure, near the four apex angles of the surface on which the above-mentioned spacing tube is not provided, four optical fiber lengths are radiated from the approximate center of the surface. The variable structures 200 — 1 to 200 — 4 are mounted. The structure of the optical fiber length variable structures 200-1 to 200-4 will be described later.

 At the approximate center of the surface of the optical fiber length variable structure support plate 100 on which the optical fiber length variable structures 200-1 through 200-4 are mounted, a wire introduction portion 300 is provided. ing. FIG. 5 is a cross-sectional view schematically showing the structure of the wire introduction part 300. Referring to FIG. 5, the wire introduction part 300 is configured by combining a screw 310 and a nut 320. A screw 310 is inserted from the surface of the optical fiber length variable structure support plate 1000 on the side where the above-mentioned spacing tube is not provided, and a nut 320 force optical fiber length variable structure support plate 10 It is provided on the fiber mounting plate 25 side of the 0 surface. The screw 310 is screwed with a nut 320 via an optical fiber length variable structure support plate 100.

 By the way, referring again to FIGS. 3 and 4, a wire 70 is used as a connecting member for connecting the optical adapter mounting plate 50 and the optical fiber length variable structures 200-1 to 200-4. The optical fiber unit 20 is provided.

 One end of the wire 70 is attached to the optical adapter attachment plate 50. Specifically, the end of the wire 70 bent in an L shape is hooked on the hook hole forming portion 71 formed on the optical adapter mounting plate 50, and the wire 70 is mounted on the optical adapter mounting plate. Connected to 50.

The wire 70 connected to the optical adapter mounting plate 50 is It is provided in the direction of movement of the attachment plate 50 (in the direction indicated by arrow C in FIG. 3B), and is slightly wound on a wire direction changing member 72 protrudingly provided on the optical fiber attachment plate 25. The direction is changed to a direction substantially perpendicular to the above-mentioned direction, that is, a direction substantially perpendicular to the direction indicated by arrow C in FIG.

 The wire 70 whose orientation has been changed by the wire orientation changing member 72 passes through the space formed between the optical fiber mounting plate 25 and the optical fiber length variable structure support plate 100, and as shown in FIG. The nut is introduced into the screwed structure of the nut 320 and the screw 310 shown. The wire 70 of the present embodiment is configured by bundling four thin wires. Therefore, as shown in FIG. 5, when the wire 70 is introduced into the above-mentioned screwed structure, the wire 70 is subjected to four thin wires 70-1 to 70-4, and extends from the screw 310. Is out. The ends of the thin wires 70-1 to 70-4 have a hook shape, and are connected to the optical fiber length variable structures 200-1 to 200-4 as described later.

 Next, the structures of the optical fiber length variable structures 200-1 to 200-4 will be described. Since each of the optical fiber length variable structures 200-1 through 200-4 has the same structure, the optical fiber length variable structure 200-1 will be described with reference to the optical fiber length variable structure 200-1. The description will be replaced with the description of 200-0-2 to 200-4.

 FIG. 6 is a side sectional view schematically showing the structure of the optical fiber length variable structure 200-1. Referring to FIG. 6, the optical fiber length variable structure 200-1 is provided with a moving body 220 and a moving body 220 inside a housing 210 fixed on the optical fiber length variable structure support plate 100. The panel member 230 serving as an elastic member is housed.

 The moving body 220 has a substantially box-like shape made of metal, and a thin wire 70-1 is connected to a surface of the moving body 220 on the wire introduction section 300 side. The moving body 220 slides in the housing 210 in the direction of arrow D or E. One end of a spring member 230 is connected to a surface of the moving body 220 facing the wire introduction portion 300 side. The other end of the panel member 230 is connected to the surface of the housing 210 that is farthest from the wire introduction portion 300.

As described above, the end of the thin wire 70-1 has a hook shape, and the wire introduction section 300 side of the moving body 220 to which the fine wire 70-1 is connected. A hole forming portion 240-1 having a predetermined size is provided on the surface. Therefore, the hook shape The connection between the thin wire 70-1 and the moving body 220 is fixed by hooking the end of the thin wire 70-1 to the hole forming portion 240-1.

 Similarly, both ends of the panel member 230 have a hook shape, and a hole having a predetermined size is formed on a surface of the moving body 220 facing the key introduction portion 300 side. Portion 240, force, and hole forming portions 240-3 having a predetermined size are provided on the surface farthest from the wire introduction portion 300 among the surfaces of the housing 210. I have. Accordingly, by hooking both ends of the panel member 230 on the hole forming portions 240-2 and 240_3, the panel member 230, the moving body 220 and the casing 2 are formed. 10 is connected.

 A fiber clamp connection hole forming portion 24 1 is formed on the upper surface of the moving body 220, and the leg portion 25 1 of the fiber clamp 250 is fitted into the connection hole forming portion 241, and The eye bar clamp 250 is fixed to the upper surface of the moving body 220. Also, the internal optical fiber 26 is press-fitted from above the fiber clamp 250 into the fiber insertion portion 252 of the fiber clamp 250, and inserted into the holding portion 253 of the fiber clamp 250. The fiber clamp 250 functions as a housing for housing the internal optical fiber 26.

 Under such a structure, when the thin wire 70-1 moves in the direction of arrow D in FIG. 6, the movable body 2 fixing the fiber clamp 250 with the internal optical fiber 26 inserted thereinto on the upper surface. 20 also moves in the direction of arrow D. When the thin wire 70-1 moves in the direction of arrow E in FIG. 6, the moving body 220 also moves in the direction of arrow E.

 Referring again to FIGS. 3 and 4, the inner optical fiber 26 has an optical fiber length-variable structure supporting plate 100 so as to form a winding circle having the wire introduction portion 300 as a center. It is wound up. The inner optical fiber 26 has an optical fiber length variable structure provided along the winding circle and at a position where the winding circle is equally divided, as viewed from substantially the center of the winding circle. It passes through the respective fiber clamps 250 of the bodies 200-0-1 to 200-4.

Further, a spring member 230 is provided in each of the optical fiber length variable structures 200-1 to 200-4. Therefore, the inner optical fiber 26 is formed on the optical fiber length variable structure support plate 100, and the wire 70 introduced into the wire introduction portion 300 provided substantially at the center of the winding circle that is formed. Moves, each fine wire 7 0— 1 to 7 0— Each of the spring members 230 of the optical fiber length variable structures 200-0 to 200-4 connected to 4 uniformly expands and contracts, and the fiber clamp 250 is fixed on the upper surface. Similarly, the moving body 220 moves by a uniform length.

 To remove the external optical fiber 27 connected to the optical adapter section 28, slide the optical fiber mounting plate 25 shown in FIG. Pull out in the direction indicated by arrow C. In synchronization with the drawing, each moving body 220 provided in the optical fiber length variable structures 200-1 to 200-4 is connected to the optical fiber 26 by the wire 70 so that the internal optical fiber 26 The fiber is pulled in the direction of substantially the center of the wound circle formed on the support plate 100 with the variable fiber length.

 Therefore, the fiber clamp 250 fixed to the upper surface of the moving body 220 also moves, and therefore, the radius of the winding circle formed by the inner optical fiber 26 on the optical fiber length variable structure support plate 100 is changed. That is, the bending radius R of the internal optical fiber 26 becomes short, and the bending radius R becomes small. '' A circle shown by a solid line in FIG. 3 and a dotted line in FIG. 4 indicate that the internal optical fiber 26 is formed on the optical fiber length variable structure support plate 100 before the optical fiber mounting plate 25 is pulled out. It is a winding circle with a bending radius R. A circle shown by a dotted line in FIG. 3 and a circle shown by a solid line in FIG. 4 indicate that the internal optical fiber 26 is formed on the optical fiber length variable structure support plate 100 when the optical fiber mounting plate 25 is pulled out. This is a winding circle with a bending radius R '. As apparent from FIGS. 3 and 4, the bending radius R (R,) is the distance between the wire introduction portion 300 and the fiber clamp 250.

 At this time, with the movement of each of the moving bodies 220, the respective panel members 230 connected to each of the moving bodies 220 are evenly pulled and evenly stretched. By the panel force of the panel member 230, the pulling force of the wire 70 pulling the moving body 220 is suppressed. In this embodiment, even when the optical fiber mounting plate 25 is pulled out in the direction indicated by the arrow C in FIG. 3B, the inner optical fiber 26 is wound on the optical fiber length variable structure support plate 100. The bending radius R 'of the wound circle formed by turning is adjusted and set so as to be about 3 O mm or more.

After completing the operation to attach the external optical fiber 27 to the optical adapter 28, Push the optical fiber mounting plate 25 shown in FIG. 4 in the direction opposite to the direction indicated by the arrow C in FIG. 3 _ (b), and house the optical fiber mounting plate 25 in the optical fiber unit 20. . In synchronization with the strong push-in, the pulling of the moving body 250 by the wire 70 is released, and the panel member 230 that has been pulled is restored. Therefore, the moving body 250 connected to the panel member 230 is moved from the center of the winding circle formed by the internal optical fiber 26 on the optical fiber length variable structure support plate 100 to the surrounding member. Move in the direction. Therefore, the bending radius R of the inner optical fiber 26, which is the radius of the winding circle, becomes longer, and the bending radius R becomes larger. In this embodiment, when the optical fiber mounting plate 25 is pushed in, the bending radius R of the winding circle formed by the internal optical fiber 26 on the optical fiber length variable structure support plate 100 is about 40 to 40. Adjusted and set to 45 mm.

 As described above, in the present embodiment, the optical fiber mounting plate 25 and the fiber clamp 250 into which the internal optical fiber 26 is inserted are connected by the wire 70. As described above, the inner optical fiber 26 is wound on the optical fiber length variable structure support plate 100 to form a winding circle, and the wire 70 is introduced from substantially the center of the winding circle. Then, it is connected to the fiber clamp 250 through the moving body 200. Further, a panel member 230 is connected to the fiber clamp 250 via a moving body 200. Therefore, the movement of the optical fiber mounting plate 50 and the fluctuation of the bending R (R,) of the wound circle are performed in synchronization (interlocking).

 By moving the optical adapter mounting plate 50 in the direction shown by the arrow C in FIG. 3 (b) by such a transmission path length varying means, the inner optical fiber 26 is stretched by the bow I, which is more than necessary. When the tension is generated or the optical adapter mounting plate 50 is moved in the direction opposite to the direction indicated by the arrow C in FIG. 3 _ (b), the internal optical fiber 26 is pushed in, causing slack. It is possible to prevent a situation in which the optical fiber unit 20 is caught by a structure constituting the internal structure of the optical fiber unit 20.

That is, the bending R (R ') of the above-mentioned wound circle fluctuates via the panel member 230, so that the fluctuation of the internal optical fiber 26 due to the movement of the optical adapter mounting plate 50 is appropriately performed. It is absorbed and the length of the inner optical fiber 26 can always be kept appropriately. By the way, at the position where the direction of the optical fiber 26, such as the portion forming a curve in which the curve changes, and its vicinity, and in the vicinity thereof, the root holding part 26-2 made of resin, aluminum, etc. The side optical fiber 26 is coated.

 That is, the direction of the internal optical fiber 26 is bent along the internal shape of the route holding portion 26-2 so as to be able to cope with the above-described variation in the bending radius R of the internal optical fiber 26. I have. The route holding section 26-2 allows the internal optical fiber 26 to be attached to a structure provided around the internal optical fiber 26 such as a structure (not shown) in the part covering the optical fiber mounting plate 25. The fiber 26 is prevented from being damaged due to contact or being caught.

 The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications and changes can be made within the scope of the present invention. For example, in the present embodiment, four optical fiber length variable structures 200-1 to 200-4 are provided, but the number is not necessarily four, and the radius of the above-mentioned wound circle is not necessarily required. For example, as long as the bend radius R (R,) can be adjusted, the number may be six.

Claims

The scope of the claims 1. Mounted on the communication device,  A transmission path unit internally provided with a transmission path connection unit that connects a first transmission path extending from inside the communication device and a second transmission path introduced from outside the communication device,  The transmission path unit, wherein the transmission path connection unit is drawn out to the front side of the transmission path unit by sliding inside the transmission path unit. 2. The first transmission path is wound inside the transmission path unit to form a winding circle;  2. The transmission path unit according to claim 1, further comprising a transmission path length varying means for changing a radius of the winding circle in synchronization with sliding of the transmission path connecting portion. 3. The variable transmission path length means,  A container that houses the first transmission path that forms the winding circle;  接 続 a connection member for connecting the transmission path connection portion and the housing body,  3. The transmission path unit according to claim 2, wherein, when the transmission path connecting portion moves, the container moves via the connection member, and the radius of the winding circle changes. 4. The variable transmission path length means,  4. The transmission path unit according to claim 3, further comprising: an elastic member connected to the housing to suppress the fluctuation of the winding circle. 5. The container is provided in plurality along the circumference of the winding circle, The transmission path according to claim 3, wherein the self-connecting member is introduced into a center portion of the winding circle, is separated from the center portion, is branched, and is connected to the plurality of containers. Road unit. 6. The transmission path unit according to claim 5, wherein a plurality of the containers are provided at positions around the circumference of the winding circle that equally divide the winding circle. 7. The transmission path connection unit,  A connection adapter into which an end of the first transmission path and an end of the second transmission path are inserted;  An adapter mounting plate to which the connection adapter is mounted, The transmission path unit according to any one of claims 1 to 6, comprising: 8. It further includes a sliding shaft mounted in a direction substantially perpendicular to a sliding direction of the adapter mounting plate,  The adapter mounting plate is provided with a sliding groove forming portion in a sliding direction of the adapter mounting plate,  8. The transmission path unit according to claim 7, wherein the transmission path connection section slides inside the transmission path unit by sliding the sliding groove forming section with respect to the sliding shaft section. .