JP2005234161A - Media converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To store an extra length part of an optical transmission line for leading it indoors in a case without impeding design flexibility of an electronic substrate. <P>SOLUTION: The media converter 48 is provided with the case (49) including an electronic unit mounting part 76 for mounting an electronic substrate itself for processing an optical signal or for mounting an electronic unit 51 inner-packaging the electronic unit 51, and is constituted to form an optical fiber storing part 68 for holding the transmission line of the optical signal in the circumferential part of the case except the electronic unit mounting part 76. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a media converter for an optical communication system.

  An optical communication system is a system that transmits a large amount of information at high speed using an optical fiber. For example, a connection between local area networks (LAN), a connection between a wide area network (WAN) and a LAN, or a cable television (CATV). ) Broadcast station and user's house.

  FIG. 8A is a conceptual diagram of a route of the optical communication system. In this figure, a multi-core optical transmission line 3 for trunk lines is stretched over the utility poles 1 and 2, and some optical fibers included in the multi-core optical transmission path 3 for trunk lines are connected to the nearest utility pole (in the figure). In the inside of the connection box 4 attached to the utility pole 2), it is connected to the optical transmission lines 5 to 7 for in-home drawing.

  FIG. 8B is a cross-sectional structure diagram of an example of the in-home optical transmission lines 5 to 7. In the illustrated example, the optical transmission lines 5 to 7 for drawing in the house are surrounded by elastically deformable outer skins, and are separated into three portions 8 to 10 (hereinafter, one end side) that are separable along the cutting lines A and B. It has a laminated cross-sectional structure composed of a portion 8, a central portion 9, and a second end portion 10. A reinforcing wire 11 made of a relatively hard material made of steel wire or the like is placed in the axis of the one end side portion 8 of the outer skin, and each axis of the central portion 9 and the other end side portion 10 of the outer skin is provided. Reinforcing lines 12 and 13 made of a relatively soft material such as a resin material are inserted, and an optical fiber 14 is inserted near the boundary between the central portion 9 and the other end portion 10 of the outer skin.

  The in-home optical transmission lines 5 to 7 having such a structure maintain the cross-sectional structure of FIG. 8B from the connection box 4 of FIG. 8A to each of the user homes 15 to 17. Although it is laid as it is, when the user houses 15 to 17 are pulled into the house from the retracted locations (for example, wall surfaces), the one end side portion 8 of the cross-sectional structure in FIG. Only the remaining portions (the central portion 9 and the other end portion 10) are drawn into the house.

  This is because the reinforcing wire 11 included in the one end side portion 8 is necessary only for protecting the cable between the utility pole 2 and the user homes 15 to 17 (ensuring the tensile strength). The reason is that the presence of the cable is obstructive (the cable is difficult to bend because the reinforcing wire 11 is hard). Further, when an electric conductor such as a steel wire is used for the reinforcing wire 11, a harmful induced current generated by a lightning strike or the like may enter the home via the reinforcing wire 11.

  As described above, in the homes of the user homes 15 to 17, only the central portion 9 and the other end portion 10 of the optical transmission paths 5 to 7 for home lead-in are drawn, and they are connected to the media converters 18 to 20, Media converters 18 to 20 and terminals 24 to 26 (for example, a CATV tuner or CATV modem in the case of CATV, a router or a hub in the case of LAN) are connected by metal cables 21 to 23.

  The media converters 18 to 20 are for performing unidirectional conversion or bidirectional conversion from an optical signal to an electrical signal. For example, when the terminals 24 to 26 are CATV tuners, unidirectional conversion is performed. When the terminals 24 to 26 are CATV modems, routers, or hubs, bidirectional conversion is performed.

The connection work between the optical transmission paths 5 to 7 for drawing in the home and the media converters 18 to 20 is generally performed according to the following procedure.
(1) First, the in-home optical transmission lines 5 to 7 are cut, and the central portion 9 and the other end portion 10 are cut along the cutting line B to expose the required length of the optical fiber 14. The “required length” means a length that allows the following operation (2) to be performed without hindrance.

(2) Next, an optical connector assembly is prepared.
FIG. 8C is a configuration diagram of the optical connector assembly. The optical connector assembly 27 is a part that is assembled (assembled) in advance by attaching the optical connector 29 to one end of the optical fiber 28 in order to improve workability in the field.

  The tips of the optical fiber 28 of the optical connector assembly 27 and the optical fibers 14 of the optical transmission paths 5 to 7 for in-home drawing are connected using a splicer (see the splicer 31 in FIG. 9). "Splicer" is a prismatic glass tube with a small hole of the same diameter as the fiber diameter in the center of the tube, and a connecting part for abutting and fixing the end faces of the optical fibers inside the hole. It is.

(3) Finally, after the optical connector 29 of the optical connector assembly 27 is connected to the optical terminals of the media converters 18 to 20 (see the optical terminal PC in FIG. 9), the extra length portion of the splicer or optical fiber is connected to the media converters 18 to 20 And the lid of the media converters 18 to 20 is closed to complete the operation.

  FIG. 9 is a structural diagram of a conventional media converter (see, for example, Patent Document 1), and in particular, is a diagram illustrating a housing structure for housing a splicer and an extra length portion of an optical fiber.

  In this figure, a splicer accommodating portion 32 for accommodating a splicer 31 and an electronic substrate accommodating portion 34 for accommodating an electronic substrate 33 are provided inside the housing 30. The surface (the non-mounting surface of the electronic component) is used as an extra length portion accommodating portion 35 for accommodating the extra length portion of the optical fiber.

  The extra length portion storage section 35 has a sufficient size for winding and storing the optical fibers 14 of the optical transmission paths 5 to 7 for drawing in the house and the optical fibers 28 of the optical connector assembly 27. The optical fiber 28 is held on the surface of the electronic board 33 by a fiber stopper 36 at several points to prevent light leakage due to extreme bending, whereby the optical fiber 14 and the optical fiber 28 are held. In this state, a gentle curve is drawn.

  Also, in this conventional media converter, the outer skin (center portion 9 and the other end portion 10) of the optical transmission paths 5-7 for in-home drawing is sandwiched and held near the lower right corner portion of the housing 30. A holding part 37 is provided.

  FIG. 10A is a structural diagram of the outer skin holding part 37. The outer skin holding part 37 includes a first standing wall 39 having a fiber groove 38 through which the optical fibers 14 of the in-home drawing optical transmission paths 5 to 7 pass, and one outer shell (center portion) of the in-home drawing optical transmission paths 5 to 7. 9) A second standing wall 41 having a skin groove 40 for sandwiching and holding, and a skin groove for sandwiching and holding the other skin (the other end portion 10) of the optical transmission paths 5 to 7 for drawing in the house. The second standing wall 41 and the third standing wall 43 are slightly inclined with respect to the insertion direction of the optical transmission lines 5 to 7 for drawing in the house. Is arranged.

  According to such a configuration, the two outer skins (the central portion 9 and the other end side) of the optical transmission paths 5 to 7 for the home drawing are formed by the skin groove 40 of the second standing wall 41 and the skin groove 42 of the third standing wall 43. Since the portion 10) is sandwiched and held, and the second standing wall 41 and the third standing wall 43 are inclined, even if an external force in the pulling direction is applied to the optical transmission paths 5 to 7 for drawing in the house. Since the external force is received by the second standing wall 41 and the third standing wall 43, the pull-in of the optical transmission paths 5 to 7 for drawing in the house can be prevented, and the disconnection of the optical fiber 14 can be avoided.

JP 2003-139964 A

  However, the conventional media converter has the following problems.

  The first problem is that since the surface of the electronic substrate 33 is used as the extra length portion storage portion 35 of the optical fiber, mounting of electronic components on the same surface is hindered, and thus the mounting density of the electronic substrate 33 is increased. In other words, the degree of freedom in designing the electronic substrate 33 is reduced.

  The second problem is that there is no “general versatility” in the outer skin holding portion 37 for preventing the in-home optical transmission lines 5 to 7 from coming off. That is, as shown in FIG. 10A, the outer skin holding portion 37 has an optimal mechanism for sandwiching and holding the outer skin (the central portion 9 and the other end portion 10) separated into two parts. However, it has a drawback that it is not possible to sandwich and hold the outer sheath of an optical cable having another structure, for example, a coaxial optical cable.

  FIG. 10B is a diagram showing a coaxial optical cable. In this figure, a coaxial optical cable 44 is configured by covering the periphery of an optical fiber 45 with an outer skin 46 having a circular cross section, and when exposing the optical fiber 45, an axially cut portion 47 is provided on the outer skin 46. However, since the diameter of the outer skin 46 of the portion having the cut-out portion 47 is substantially equal to the diameter of the optical cable 44, this diameter is, for example, the two outer skins (the central portion 9 and the other end side). This is because when the diameter is larger than the diameter of the portion 10), it cannot fit in the skin groove 40 (or the skin groove 42) of the skin holding portion 37.

  Therefore, the present invention can store the extra length of the optical transmission path for in-home drawing in the housing without hindering the degree of freedom in designing the electronic board, or is not affected by the structure of the optical transmission path for in-home drawing. It is an object of the present invention to provide a media converter that can achieve prevention of disconnection of an optical transmission line for in-home use.

The media converter according to the first aspect of the present invention includes a housing having an electronic unit mounting portion for mounting an electronic substrate itself for processing an optical signal or for mounting an electronic unit including the electronic substrate. In the media converter, an optical fiber storage portion for storing the transmission path of the optical signal is formed on a peripheral portion of the casing excluding the electronic unit mounting portion.
According to a second aspect of the present invention, there is provided a media converter including a housing having an electronic unit mounting portion for mounting an electronic substrate itself for processing an optical signal or for mounting an electronic unit in which the electronic substrate is mounted. In the media converter, the electronic unit mounting portion is a portion surrounded by an inner wall that is erected on the inner side of the outer wall serving as a side surface of the housing at a minute distance, and between the outer wall and the inner wall. The gap is used as an optical fiber storage for storing the optical signal transmission path.
According to a third aspect of the present invention, there is provided a media converter including a housing having an electronic unit mounting portion for mounting an electronic substrate itself for processing an optical signal or for mounting an electronic unit in which the electronic substrate is mounted. In the media converter, the electronic unit mounting portion is a portion surrounded by an inner wall that is erected on the inner side of the outer wall serving as a side surface of the housing at a minute distance, and between the outer wall and the inner wall. The gap is used as an optical fiber storage section for storing the optical signal transmission path, and an optical fiber winding section for winding and storing the optical signal transmission path in an empty space of the electronic unit mounting section. Is formed.
According to a fourth aspect of the present invention, there is provided a media converter including a housing having an electronic unit mounting portion for mounting an electronic substrate itself for processing an optical signal or for mounting an electronic unit including the electronic substrate. The media converter includes a skin holding means for holding a skin of the optical signal transmission path introduced into the housing, and the skin holding means stands on an outer wall that is a side surface of the housing and on an inner side of the outer wall. The outer skin is sandwiched and held between the standing wall-shaped optical cable outer skin holding member provided.
A media converter according to a fifth aspect of the present invention is the media converter according to the fourth aspect, wherein the outer skin holding means includes a protrusion formed on an upper housing used as a lid of the housing. It is intended to prevent the outer skin from coming off toward the upper housing.
According to a sixth aspect of the present invention, there is provided a media converter according to the fourth aspect of the present invention, in which the outer wall serving as a side surface of the casing is disposed between the standing wall-shaped optical cable outer skin holding member standing on the inner side of the outer wall. The formed cross-sectional shape is characterized in that the opening width becomes narrower toward the bottom.
A media converter according to a seventh aspect of the present invention is the media converter according to the fourth aspect, characterized in that a part of the standing wall-shaped optical cable sheath holding member is a deformable deformable portion.
A media converter according to an eighth aspect of the invention is characterized in that, in the fourth aspect of the invention, a sawtooth surface is formed on the outer skin contact surface of the vertical wall-shaped optical cable outer skin holding member.

According to the first aspect of the present invention, since the optical fiber storage portion for storing the optical signal transmission path is formed in the peripheral portion of the casing excluding the electronic unit mounting portion, the electronic unit (or the unit) When designing the electronic board to be mounted), it is not necessary to consider the accommodation of the optical signal transmission path at all, and therefore, the design flexibility of the electronic unit (or the electronic board mounted on the unit) is not hindered.
According to the second aspect of the present invention, the optical signal transmission path can be accommodated in the gap between the outer wall and the inner wall of the housing. Similarly to the first aspect, the electronic unit (or the unit) In designing the electronic board mounted on the electronic board, it is not necessary to consider the accommodation of the transmission path of the optical signal at all. Therefore, the design freedom of the electronic unit (or the electronic board mounted on the unit) is not hindered.
According to the third aspect of the present invention, since the optical fiber take-up portion is further provided in addition to the optical fiber storage portion, the extra length of the optical signal transmission path can be efficiently utilized by using the storage portion and the take-up portion. Processing can be performed.
According to the invention of claim 4, just by sandwiching the outer shell of the optical transmission path between the outer wall that is the side surface of the housing and the standing wall-shaped optical cable outer shell holding member standing on the inner side of the outer wall, It is possible to easily prevent the optical transmission path from coming off.
According to the fifth aspect of the present invention, it is possible to prevent the outer skin from coming off in the direction of the upper casing by the protrusion formed on the upper casing used as the lid of the casing.
According to the invention of claim 6, the cross-sectional shape formed between the outer wall serving as the side surface of the housing and the standing-wall-shaped optical cable outer skin holding member standing on the inner side of the outer wall increases toward the bottom. Since the opening width is narrowed, the outer skin can be sandwiched and held with a stronger force by pushing the outer skin in the direction of the bottom of the cross-sectional shape, and a further retaining prevention effect can be obtained.
According to the seventh aspect of the present invention, since a part of the standing wall-shaped optical cable outer sheath holding member forms a deformable deformable portion, even if it is a thick outer sheath, the deformed portion is deformed so as to be sandwiched without any trouble. Can be held.
According to the eighth aspect of the present invention, since the serrated surface is formed on the outer skin contact surface of the standing wall-shaped optical cable outer sheath holding member, the effect of preventing the outer skin from being securely removed is obtained by the resistance of the serrated surface. Can do.

  Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the specific details or examples in the following description and the illustrations of numerical values, character strings, and other symbols are only for reference in order to clarify the idea of the present invention, and the present invention may be used in whole or in part. Obviously, the idea of the invention is not limited. In addition, a well-known technique, a well-known procedure, a well-known architecture, a well-known circuit configuration, and the like (hereinafter, “well-known matter”) are not described in detail, but this is also to simplify the description. Not all or part of the matter is intentionally excluded. Such well-known matters are known to those skilled in the art at the time of filing of the present invention, and are naturally included in the following description.

  FIG. 1 is an exploded view of the media converter 48 in the present embodiment. In this figure, the media converter 48 is an electronic unit (an electronic board may be used between the lower housing 49 (housing) and the upper housing 50 having a vertically divided structure), but in this embodiment, it is referred to as a unit. ) 51 is assembled and assembled.

  The lower housing 49 has a vertically thin box shape with an open top surface. Inner walls 56 to 59 are erected on the inner side of the outer walls 52 to 55 that are the side surfaces of the lower housing 49 with a predetermined minute distance (L) therebetween, and the corner portions 60 to 63 and the inner walls of the lower housing 49 are erected. The corner portions 64 to 67 of 56 to 59 are gently formed so as to draw a predetermined curvature (R). Here, L is a size that can accommodate the optical fiber, and R is a size that does not give extreme bending to the optical fiber.

  A gap (gap between the outer walls 52 to 55 and the inner walls 56 to 59) formed so as to go around the periphery of the lower housing 49 is used as an optical fiber storage portion 68, as will be described later. The part has a take-out part 69 for taking out the optical fiber stored in the optical fiber storage part 68.

  Wide portions (parts where inner walls 57 and 59 are partly recessed inside the lower housing 49) formed at two locations of the optical fiber storage portion 68 are used as splicer storage portions 70 and 71, as will be described later. The

  Furthermore, optical cable introduction grooves 72 and 73 are formed in the two opposite corner portions 60 and 62 of the lower housing 49. Inside the optical fiber storage portion 68 close to the optical cable introduction grooves 72 and 73, Standing wall-shaped optical cable skin holding members 74 and 75 (outer skin holding means) are provided upright.

  A wide part surrounded by the inner walls 56 to 59 is a part (electronic unit mounting part 76) for mounting the electronic unit 51. The electronic unit mounting part 76 has several parts for fixing the electronic unit 51. Bolt holes 77 to 80 are formed, and bolt holes 81 to 83 for attaching the lower housing 49 to the wall surface of the building are formed.

  The electronic unit 51 is not particularly limited thereto. For example, an electronic board (not shown) is mounted inside a box-shaped closing case 84 similar to an L-shape, and at least an optical signal input is provided on any side surface of the case 84. (Or input / output) optical signal terminal 85, electrical signal output (or input / output) electrical signal terminal 86, and power supply terminal 87.

  Incidentally, if the illustrated media converter 48 is used for receiving a television broadcast such as CATV, the electronic board mounted inside the case 84 converts the television broadcast signal received as an optical signal into an electrical signal. The electric signal terminal 86 has a function of outputting and is a general-purpose television signal terminal for taking out the electric signal. Alternatively, if the illustrated media converter 48 is used for a LAN, the electronic board has a function of bidirectionally converting an IP packet between an optical signal and an electrical signal, and the electrical signal terminal 86 is It becomes a general-purpose LAN terminal.

  The upper housing 50 is used as an open surface closing lid of the lower housing 49, and an electric signal cable introduction groove 87 and a power cable introduction groove 88 are formed on one side surface thereof.

  FIG. 2 is a plan view of the lower housing 49. The electronic unit 51 is mounted, the optical connector 89 is connected to the electronic unit 51, and the “extra length portion of the optical fiber” connected to the optical connector 89 is connected to the optical fiber. It is a figure which shows the state wound and accommodated in the accommodating part.

  The “extra length portion of the optical fiber” refers to a first optical fiber 90 having an optical connector 89 attached to one end in advance, and a second optical fiber 93 that is exposed by peeling off the outer sheath 92 of the optical transmission path 91 for in-home drawing. This is the part where the space is connected by the splicer 94. In general, this portion requires a certain length (several tens of centimeters) in order to connect the splicer 94.

  In the illustrated example, the splicer 94 is stored in the splicer storage unit 70 on the left side of the drawing, but may be stored in the splicer storage unit 71 on the right side. An appropriate one may be selected and used according to the length of the extra length of the optical fiber.

  As described above, in the media converter 48 of the present embodiment, the optical fiber storage portion 68 is formed along the periphery of the lower housing 49, and the extra length portion of the optical fiber is stored in the optical fiber storage portion 68. That is, since the mounting location of the electronic unit 51 and the optical fiber storage 68 are separated, it is not necessary to consider the storage of the extra length of the optical fiber when designing the electronic unit 51.

  Therefore, according to the present embodiment, the electronic unit 51 can be designed with emphasis on the mounting density and performance, and the first “first problem”, that is, “the surface of the electronic substrate 33 is connected to the optical fiber. Since it is used as the extra length portion storage portion 35, it prevents the electronic component from being mounted on the same surface. Therefore, the mounting density of the electronic substrate 33 cannot be increased, and the design freedom of the electronic substrate 33 is reduced. Can be solved.

  Next, the structure of the optical cable outer sheath holding members 74 and 75 in the present embodiment will be described.

  FIG. 3A is a detailed view of the optical cable outer sheath holding members 74 and 75. In addition, although this figure has shown about the one optical cable outer skin holding member 75, the other optical cable outer skin holding member 74 also has the same structure. Hereinafter, the optical cable outer cover holding member 75 will be described as an example.

  As described above, the optical cable outer sheath holding member 75 is erected inside the optical fiber housing 68 close to the optical cable introduction groove 73, and the outer sheath 92 of the optical transmission path 91 for in-home drawing is connected to the optical cable. It is inserted into a narrow gap between the outer skin holding member 75 and the outer wall 53. Since the outer skin 92 of the optical transmission path 91 for drawing in the house is made of an elastic material, it is compressed and deformed when a force is applied to the outer skin 92.

  For this reason, if the gap between the optical cable outer sheath holding member 75 and the outer wall 53 is set to be an appropriate amount smaller than the size of the outer sheath 92 at the time of non-compressive deformation, the outer shell 92 is pushed into the above-described gap, so that the compression deformation is reduced. By using the restoring force, it is possible to reliably prevent the outer skin 92 from coming off (thus preventing the optical transmission path 91 from being pulled in).

  In addition, since such a retaining structure exhibits a retaining effect simply by pushing the outer shell 92 of the in-home optical transmission path 91, the type of the optical transmission path (in-house optical transmission path 91) Will not be affected. For example, in the case of the optical transmission line having the structure that can be divided into three parts (see FIG. 8B) described at the beginning, both the outer sheaths (see reference numerals 9 and 10 in FIG. 9) are combined with the optical cable outer sheath holding member 75. What is necessary is just to push in the clearance gap between the outer walls 53. FIG.

  Further, in order to increase the certainty of the above-described retaining effect, the following may be performed.

  FIG. 4A is a cross-sectional view of the main part of the media converter 48. In this figure, two protrusions 95 and 96 extending toward the lower housing 49 are provided on the inner surface of the upper housing 50. One protrusion 95 is positioned above the optical fiber 93 stored in the optical fiber storage 68 to prevent the optical fiber 93 from coming off from the optical fiber storage 68 (upward detachment). Similarly, the other protrusion The part 96 is positioned above the outer sheath 92 accommodated in the optical fiber accommodating portion 68 and prevents the outer sheath 92 from coming off from the optical fiber accommodating portion 68 (disengagement upward). As described above, by providing the two protrusions 95 and 96, it is possible to prevent the optical fiber 93 stored in the optical fiber storage unit 68 and the outer sheath 92 from being detached from the optical fiber storage unit 68.

  FIG. 4B is an improved view of the above-described separation preventing structure. A feature of this figure is that a V-shaped groove 97 (or a groove whose opening width becomes narrower as it goes downward) is formed between the optical cable outer sheath holding member 75 and the outer wall 53. In this way, the outer skin 92 placed in the V-shaped groove 97 between the optical cable outer skin holding member 75 and the outer wall 53 is caused by the other projecting portion 96 formed in the upper housing 50 to cause the V-shaped groove 97. Since it is pushed in the direction of the bottom of 97, the amount of compressive deformation of the outer skin 92 can be increased, and an even more reliable prevention effect can be exhibited.

  In the above description, splicer storage portions 70 and 71 for storing the splicer 94 are formed in the lower housing 49, but the outer size of the splicer 94 is not constant for each product, and the splicer storage portion Naturally, a splicer 94 having an outer shape smaller than the storage size of 70 and 71 is also possible. When such a small-sized splicer 94 is stored in the splicer storage units 70 and 71, the splicer 94 has play inside the splicer storage units 70 and 71, and is not preferable.

  4C and 4D are diagrams showing the holding structure of the splicer 94. FIG. In these drawings, protrusions 98 and 99 extending toward the lower housing 49 are provided on the inner surface of the upper housing 50. These protrusions 98 and 99 are located above the splicer 94 stored in the splicer storage unit 70 and prevent the splicer 94 from coming off (disengaging upward) from the splicer storage unit 70. An elastic member 100 such as rubber or sponge is spread on the bottom of the splicer storage portion 70, and the splicer 94 pressed from above by the projecting portions 98 and 99 compresses and deforms the elastic member 100. Sit on the top.

  Therefore, according to such a structure, since the size of the outer size of the splicer 94 can be absorbed by the compression deformation of the elastic member 100, play (backlash) of the splicer 94 inside the splicer storage portions 70 and 71 can be prevented and firmly secured. And can be held.

  Incidentally, in FIG. 4D, an elastic body 101 such as rubber or sponge is attached to the lower end of the protrusion 99. This is a measure for the case where the outer size of the splicer 94 is considerably small and cannot be absorbed even by the compressive deformation of the elastic member 100 spread on the bottom of the splicer storage 70.

  In addition, this invention is not limited to the above embodiment. It goes without saying that various modifications and developments are included within the scope of the technical idea. For example, the optical cable sheath holding members 74 and 75 may be improved as follows.

  FIG. 3B is a view showing a first improved example of the optical cable outer sheath holding members 74 and 75. In this figure, the optical cable sheath holding members 74 and 75 are composed of a fixing portion 102 fixed to the bottom surface of the lower housing 49, and a deforming portion 104 that can be deformed in the direction of the white arrow 103, and The thickness Db of the end portion of the deformable portion 104 is larger than the thickness Da of the end portion of the fixed portion 102, and the thickness between these two end portions changes substantially linearly.

  According to the optical cable skin holding members 74 and 75 having such a configuration, when the outer skin 92 is sandwiched between the optical cable skin holding members 74 and 75 and the outer wall 53, the deforming portion 104 corresponds to the outer size of the outer skin 92. Is deformed in the direction of the white arrow 103, and the outer skin 92 is strongly held by the deformation restoring force, so that it is possible to further prevent the optical cable from being prevented from coming off. In addition, since the thicker outer skin 92 can be held corresponding to the size of the deformation limit of the deformation member 104, various types of optical cables can be flexibly supported.

  FIG. 3C is a diagram illustrating a second improved example of the optical cable outer sheath holding members 74 and 75. In this figure, a serrated portion 105 (sawtooth-like surface) is formed on the outer skin holding surfaces of the optical cable outer skin holding members 74 and 75. The tooth surface of the serrated portion 105 is formed such that the resistance in the direction indicated by the white arrow 106 (the direction in which the optical cable is pulled out) is large and the resistance in the opposite direction is small. The outer skin 92 in contact with the serrated portion 105 can be given a large resistance in the direction of removal, and a reliable removal prevention effect can be exhibited.

  FIG. 5 is a diagram showing another structure of the lower housing 49. In this figure, the difference from the lower housing 49 (see FIG. 2) of the above embodiment is that an optical fiber take-up portion 107 of the optical fiber 90 is formed using the empty space of the electronic unit mounting portion 76. . That is, as shown in FIG. 5, when the external dimension of the electronic unit 51 is small and a required empty space is generated near the upper portion of the electronic unit mounting portion 76, the empty space is subjected to a predetermined curvature (extreme bending of the optical fiber). A curved standing wall 108 having a curvature that is not given) is formed, and the optical fiber 90 can be wound and stored along the inner peripheral surface of the standing wall 108. If it does in this way, the excess length part of an optical fiber can be efficiently accommodated using two optical fiber accommodating parts (The optical fiber accommodating part 68 and the optical fiber winding part 107).

  In the above description, the introduction port of the optical transmission path 91 for drawing into the home to the media converter 48 is defined as two corner portions (the optical cable introduction groove 72 and the optical cable introduction groove 73) facing the lower housing 49. However, the present invention is not limited to this. The other two locations may be used, or introduction ports may be provided in all corner portions.

  FIG. 6 is a view showing a method for introducing the optical transmission path 91 for drawing in the house, which is performed using the introduction ports (the optical cable introduction groove 72 and the optical cable introduction groove 73) described above, and FIG. FIG. 6B is a diagram showing what is performed using the optical cable introduction groove 73 in the lower right corner portion of the lower casing 49, and FIG. In any case, the extra length portion of the optical cable can be stored without hindrance using the optical fiber storage portion 68 and the optical fiber winding portion 107.

  FIG. 7 is a diagram illustrating an example in which an introduction port (the optical cable introduction groove 109 in the lower left corner part and the optical cable introduction groove 110 in the upper right corner part) is provided in each of the other two corner parts of the lower housing 49. . In this case, the extra length portion of the optical cable can be accommodated without hindrance by winding the optical fiber so as to draw “8” around the optical fiber winding portion 107 as in FIG.

It is an exploded view of the media converter 48 in this embodiment. 4 is a plan view of a lower housing 49. FIG. It is detail drawing of the optical cable outer sheath holding members 74 and 75. 3 is a cross-sectional view of a main part of the media converter 48. FIG. It is a figure which shows the other structure of the lower housing | casing 49. FIG. It is a figure which shows the introduction method of the optical transmission path 91 for in-home drawing performed using the introduction port (The optical cable introduction groove 72, the optical cable introduction groove 73) as stated above. It is a figure which shows the example at the time of providing the inlet (the optical cable introduction groove | channel 109 of a lower left corner part, and the optical cable introduction groove | channel 110 of an upper right corner part) in each of two other corner parts of the lower housing | casing 49. It is the path | route conceptual diagram of an optical communication system, the example of a cross-sectional structure figure of the optical transmission paths 5-7 for in-home drawing, and the block diagram of an optical connector assembly. It is a structural diagram of a conventional media converter. It is a figure which shows the structural drawing of the outer skin holding | maintenance part 37, and a coaxial optical cable.

Explanation of symbols

48 Media converter 49 Lower housing (housing)
DESCRIPTION OF SYMBOLS 50 Upper housing | casing 51 Electronic unit 52 Outer wall 53 Outer wall 54 Outer wall 55 Outer wall 56 Inner wall 57 Inner wall 58 Inner wall 59 Inner wall 68 Optical fiber storage part 74 Optical cable outer skin holding member (outer skin holding means)
75 Optical cable skin holding member (outer skin holding means)
76 Electronic unit mounting portion 92 Outer skin 96 Projection portion 104 Deformation portion 105 Sawtooth portion (sawtooth surface)
107 Optical fiber winding part

Claims (8)

In a media converter including a housing having an electronic unit mounting portion for mounting an electronic substrate itself for processing an optical signal or mounting an electronic unit in which the electronic substrate is mounted,
A media converter characterized in that an optical fiber storage portion for storing the transmission path of the optical signal is formed at a peripheral portion of the casing excluding the electronic unit mounting portion. In a media converter including a housing having an electronic unit mounting portion for mounting an electronic substrate itself for processing an optical signal or mounting an electronic unit in which the electronic substrate is mounted,
The electronic unit mounting portion is a portion surrounded by an inner wall erected at a minute distance inside an outer wall that is a side surface of the housing,
A media converter characterized in that a gap between the outer wall and the inner wall is used as an optical fiber storage unit for storing the optical signal transmission path. In a media converter including a housing having an electronic unit mounting portion for mounting an electronic substrate itself for processing an optical signal or mounting an electronic unit in which the electronic substrate is mounted,
The electronic unit mounting portion is a portion surrounded by an inner wall erected at a minute distance inside an outer wall that is a side surface of the housing,
And, the gap between the outer wall and the inner wall is used as an optical fiber storage section for storing the optical signal transmission path,
Furthermore, an optical fiber winding portion for winding and storing the optical signal transmission path is formed in an empty space of the electronic unit mounting portion. In a media converter including a housing having an electronic unit mounting portion for mounting an electronic substrate itself for processing an optical signal or mounting an electronic unit in which the electronic substrate is mounted,
The outer skin holding means for holding the outer skin of the optical signal transmission path introduced into the housing includes an outer wall serving as a side surface of the housing, and an upright wall provided upright on the inner side of the outer wall. A media converter characterized in that the outer cover is sandwiched and held between the optical fiber outer cover holding member.   The outer skin holding means includes a protrusion formed on an upper housing used as a lid of the housing, and the protrusion prevents the outer skin from coming off toward the upper housing. Item 5. The media converter according to item 4.   The cross-sectional shape formed between the outer wall serving as the side surface of the housing and the standing optical fiber cable holding member standing on the inner side of the outer wall has a shape in which the opening width becomes narrower toward the bottom. The media converter according to claim 4.   The media converter according to claim 4, wherein a part of the standing wall-shaped optical cable sheath holding member is a deformable deformable portion. 5. The media converter according to claim 4, wherein a serrated surface is formed on the outer surface of the vertical wall-shaped optical cable outer surface holding member.

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