JP4889592B2 - Optical cable housing part of optical cable device housing - Google Patents

Description

  The present invention relates to a housing of an optical cable device that receives and transmits a video signal and the like by an optical fiber cable (hereinafter referred to as an optical cable), and particularly when connecting the optical cable to a transmission / reception device, an O / E converter, or the like. An optical cable housing portion having a structure for sandwiching and holding an attachment member such as a connection tool for connecting an optical cable or a filter connected to the optical cable in a housing portion that accommodates the extra length portion and the terminal portion wound in a loop. Optical cable tray).

  In this type of optical cable equipment casing, a connector called a mechanical splice is used to join the optical cables, or the optical cables are abutted and welded, and the periphery of the welded portion is covered with a heat-shrinkable protective tube. However, there are various types of connecting devices and protective tubes, and the cross-sectional shape is square and circular, and the size ranges widely from 2 mm to 5 mm. In addition, since the wavelength of the optical signal is different for communication and TV video, a WDM (Wavelength) is used to demultiplex a specific signal from a plurality of signals having different wavelengths or to synthesize a plurality of signals. Division Multiplexing (Wavelength Division Multiplexing) filter needs to be installed, and such a filter is interposed in the middle of the optical cable, but the cross-sectional shape of the filter is also square and circular, and the size is also 2.5mm to 5.5mm There are even more products.

  Therefore, in the optical cable housing portion, it is desired to provide a holding structure corresponding to the cross-sectional shape and size of the attachment member such as the optical cable connector, the protective tube, and the filter in the middle of the guide groove portion of the optical cable.

  Also, in conventional optical cable housings, mechanical splices are usually used for optical cable connectors, and the filters used are also shaped and limited in size, so mechanical splices or specific filters are used. It should have been provided with a holding structure of a certain standard corresponding to.

However, with the recent increase in the number of optical cable connectors and filters, there is an optical receiver that includes an optical cable housing portion that supports attachment members (for example, a diameter of 2 mm to 5.5 mm) in a wide range of sizes and shapes. It has been proposed (see, for example, Patent Document 1). A first WDM filter is detachably sandwiched and held in an optical cable housing portion of the optical receiver by a pair of locking pieces protruding so as to be opposed to each other with a first predetermined interval from the upper surface of the substrate. And two first support portions arranged at predetermined intervals on the center line at the first predetermined interval, and a second predetermined interval wider than the first predetermined interval from the upper surface of the substrate. A support portion that is disposed opposite to and holds the second WDM filter in a detachable manner at a second predetermined interval by a pair of locking pieces projecting higher from the upper surface of the substrate than the first support portion. The first support portion and the center line of the second support portion are on the same line, and the first WDM is composed of two sets of second support portions arranged on the center line at a predetermined interval. The filter and the second WDM filter are not superposed on the substrate. In consisting of arrangement to structure.
JP 2007-57806 A (pages 2 and 3, pages 6 and 7 and FIGS. 1 and 11)

The structure of the filter holder in the optical cable housing portion described in Patent Document 1 has room for improvement in the following points. That is,
Two pairs of locking pieces capable of holding the filter from both sides across the center line on the substrate of the optical cable housing portion are provided so as to face each other with a distance in the longitudinal direction. A pair of locking pieces having a wide interval and a high height are shifted back and forth so as not to overlap with the locking pieces, and two sets of protruding pieces are opposed to each other across a common center line. Two types of filters, a filter and a wide filter, can be sandwiched and held. The filter is used to remove a signal having a specific frequency from TV signals and communication signals. However, the number of types of filters increases, the connector such as a protective tube for optical cable connectors and mechanical splices are also held and held, or the size (especially the width dimension) of the filters and connectors is changed. When the size of the filter etc. to be clamped becomes wide, even if each locking piece is made of resin and has flexibility, each attachment member such as the filter is held so as to be clamped from both sides as a whole Therefore, the allowable range is small. Therefore, it is necessary to change the distance in the width direction and the height of the pair of locking pieces according to the size and shape of each attachment member. In addition, it is difficult to easily change the existing mold for molding the optical cable housing from the structure, so it is necessary to design the mold from the beginning and make a new one, cost and labor Take it.

  The present invention has been made in view of the above points, and can cope with a wide range of changes in the shape and size (dimensions) of attachment members such as filters and mechanical splices, and there are some changes in size (dimensions). In addition, even if the shape or size of the accessory is changed significantly, it can be handled by changing only one side (rib side). It is an object of the present invention to provide an optical cable housing portion of an optical cable device housing that can be dealt with by correction, can be stably held in a fixed position without firmly holding an attachment member, has a simple structure, and is easy to manufacture.

In order to solve the above problems, an optical cable housing portion of an optical cable device housing according to the present invention is an optical cable device housing including an optical cable housing portion that can be housed by winding an optical cable in a loop shape. At least one part of the guide groove for winding the optical cable, the spring member is positioned relative to one guide wall of the linearly extending guide groove so that an accessory such as a connector for connecting the optical cable or a filter connected to the optical cable can be held. The guides facing each other so that a predetermined interval is provided with respect to the guide wall toward the guide wall, and the interval with the spring member is gradually reduced from the upper side to the lower side. projecting rib to wall, said spring member is integrally from one of the guide walls as viewed from above the substantially L-shaped shape along the longitudinal direction of the guide groove It consists of a pair of flexible resin spring pieces that extend, and faces each other so that the distance between the front and rear end portions of the front and rear spring pieces gradually decreases from the upper side to the lower side. The ribs are provided so as to protrude perpendicular to the guide walls, and the guide walls opposite to the spring pieces are composed of a pair of plate-like walls that are intermittently erected along the front-rear direction. It is characterized in that a space for inserting at least one finger is provided between the walls .

  Since the optical cable housing portion of the optical cable equipment casing according to the present invention is configured as described above, the following excellent effects are obtained.

  According to the first aspect of the present invention, the spring member is provided from one guide wall toward the opposing guide wall so as to have a predetermined interval with respect to the guide wall, and the interval between the spring member and the spring member. Since ribs project from the opposing guide walls so as to gradually narrow from the upper side to the lower side, attachment members such as filters and mechanical splices interposed in the optical cable are moved from one side to the other with a spring member. Therefore, even if there is a change in the size or shape of the attached member, it can be sufficiently handled. For the same reason, the rib protruding from the guide wall facing the spring member has a maximum interval of, for example, 5 mm, and a protrusion amount of 2 mm is sufficient to hold the accessory member having a diameter of 3 mm.

- In addition, since the spring member comprises a shaped resin spring piece substantially L by one of the guide wall integrally molded with spacing accessory members such as a filter or a mechanical splice which is interposed an optical cable in the longitudinal (lengthwise direction) Since it can be pressed and supported at two locations and the accessory member can be held in a straight line, it can be held stably and reliably for a long time. In addition, since the ribs are projected between the tip of the spring piece from the upper side to the lower side so that the interval is gradually reduced, the size and shape of the accessory can be changed in a very wide range. A plurality of types of attachment members having different shapes can be sandwiched and securely held.

· In addition, the accessory member, such as a filter or a mechanical splice, when and removed by pulling out from the state of being pinched or or clamping inserted between front and rear side tip and the guide wall or rib of the spring piece, for example a thumb Since the space can be pushed in and pulled up with the index finger sandwiched from above and below, the operation can be performed smoothly, easily and reliably. As a result, an excessive force is not applied to the attachment member and the optical cable before and after the attachment / detachment of the member, so that the attachment member and the optical cable are not damaged.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an optical cable housing portion of an optical cable device housing according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view of an external appearance of an optical cable device housing having an optical cable housing portion according to an embodiment of the present invention, and shows a state in which a lid is opened. 2 and 3 are a perspective view and a plan view, respectively, showing one optical cable housing portion of the optical cable equipment housing of FIG. 1, and FIG. 4 (a) shows the main part of the present invention in FIG. FIG. 4B is a perspective view showing an enlarged view thereof. FIG. 5A is a plan view showing a state in which a wide (thick) filter having an enlarged main part of FIG. 4 is sandwiched and held, and FIG. 5 (b) is a narrow (thin) filter. It is a top view which shows the state which clamped and hold | maintained. 6 (a) is a front view of FIG. 5 (a), FIG. 6 (b) is a front view of FIG. 5 (b), and FIG. 6 (c) is a front view showing another embodiment. It is an arrow view.

  As shown in FIG. 1, the optical cable device housing 1 is composed of a housing of an optical receiver in this embodiment. The housing 1 is made of resin, and one surface (upper surface) 1a is opened, and can be opened and closed on the open surface 1a side. A resin-made lid 2 is provided. The casing 1 has mounting pieces 1f on the wall surface of the building near the entrance of an optical cable such as a building or a condominium or the TV output signal cable after optical signal conversion with both hinges 2a of the lid 2 facing upward. Used to attach with fixing screws.

As shown in FIG. 1, a pair of left and right optical fiber housing portions 3 made of resin and having a shallow tray shape with an open upper end are detachably fitted to the open surface 1 a of the housing 1. On the other hand, in the case 1 below the right side optical cable housing 3, in the case of this example, although not shown, an O / E converter that converts an optical signal into an electric signal, and the converted electric signal are amplified. as amplifier equipment unit 21, in the optical cable accommodating portion 3 below the housing 1 of the left amplifier for amplifying the optical signal are respectively stored as the device unit 22 of the other one. On the front surface 1b of the housing 1 (the side located on the lower surface in the attached state), there are a hole 1c of the TV electric signal output terminal 21a and a monitor terminal 21b for monitoring the TV electric signal output from the output terminal. A hole 1d is formed with a gap. Further, a locking plate 4 is provided at a front end portion of the open end side frame 2 b of the lid 2 in a perpendicular direction, and locking pieces 4 a locked corresponding to the locking plate 4 are provided on both side surfaces of the housing 1. It is formed integrally with the upper edge. Further, the fasteners 5 are respectively provided at right angles on both sides of the open end side frame 2b of the lid 2, and the screw hole portions 5a are integrally formed at positions corresponding to the fasteners 5 on the front surface 1b of the housing 1. Is formed.

  As shown in FIG. 2 and FIG. 3, the left and right optical cable housing portions 3 are provided with frame walls 31 and 32 standing all around, and as shown in FIG. 2, the optical cable entrance 33 (front end right end) and the amplified optical cable. A part of the frame wall 31 located at the entrance / exit 33 (center on the front side) is notched and opened. An opening (not shown) is also provided on the front surface 1b of the housing 1 so as to coincide with the notch opening 31a. Reference numeral 1f in FIG. 1 is a wall surface mounting piece of the housing 1 and is provided with a set screw through hole. This mounting piece 1f is provided at the center portion of the upper end edge in addition to both sides of the lower end edge. Yes.

  As shown in FIGS. 2 and 3, each optical cable housing 3 is a rectangular frame as viewed from above, and optical cable entrances 33 are provided on the left and right sides of the front part, respectively. In this example, the mounting portion 33a of the elastic holder 7 (FIG. 1) capable of holding an optical cable is formed on the mounting portion 33a. The mounting portion 33a is opposed to the side wall 32 and is an inner frame erected in parallel. It is comprised with the wall 33b. The elastic holder 7 is entirely formed of a material having elasticity such as rubber or elastomer, and optical cable insertion grooves (not shown) are formed in parallel at equal intervals, and are formed on the upper surface of each insertion groove. A cut is made in the longitudinal direction at the center position.

  At the entrance / exit 33 of the optical cable housing portion 3, two ribs 8 corresponding to the notches of the elastic body holder 7 and ribs 9 corresponding to the longitudinal grooves on both sides of the elastic body holder 7 stand with a predetermined interval. It is installed. The opposing surfaces (clamping surfaces) of the ribs 8 and 9 are respectively formed on tapered surfaces whose intervals gradually decrease from the proximal end toward the notch opening 31a on the distal end side. Further, a rectangular plate-shaped retaining piece is integrally formed at the upper ends of the ribs 8 and 9.

  A screw hole portion 12 of a fixing screw for wrapping and fixing a support member placed in parallel with the optical fiber in the optical cable is provided at the corner near the back surface on the opposite side of the entrance / exit 33 of the optical cable housing portion 3. .

  Each optical cable housing portion 3 is provided with an oval opening 3a at the center thereof, and is composed of a combination of a linear portion and an arcuate portion at the four arcuate peripheral portions around the opening 3a. A guide wall 35 is erected on the substrate 3b. The front left arc portion and the rear right arc portion are doubled with a space in the radial direction, and the rear left arc portion is tripled with a space in the radial direction. Each guide wall 35 is erected on the substrate 3b. A path through which the extra length portion of the optical cable drawn into the inside of the entrance / exit 33 along the guide groove portion (or guide portion) 34 constituted by these guide walls 35 or sent out from the inside is wound in a loop shape ( Guide groove portions) 34 are formed. That is, as shown in FIGS. 2 and 3, in this example, the optical cable is wound around the plurality of guide walls 35 in order from the outer peripheral side to the inner peripheral side in a loop shape at regular intervals in the radial direction. The long part can be accommodated. An optical cable retaining piece 35a is integrally formed at the upper end of the guide wall 35 with an interval in the longitudinal direction.

  Further, a straight guide wall 36 that intermittently connects the guide walls 35 and 35 of the front and rear arc-shaped corners is erected on the substrate 3b at the straight edges on both sides around the opening 3a. As shown in FIG. 2 and FIG. 3, in the straight portion on the left side, the partial substrate 3c protrudes into the opening 3a and is formed at a position one step higher than the substrate 3b. Straight guide walls 37 and 37 are erected at intervals in the front-rear direction, and a space (space portion) 37 c into which two to three fingers can be inserted is provided between the guide walls 37 and 37. This empty space 37c is used to reliably and easily attach and detach the filter. In addition, a pair of front and rear straight guide walls 38 and 38 are erected on the substrate 3b with a space in the front and rear direction outside the continuous straight guide walls 36 on the left and right. Further, the substantially straight spring pieces 41 and 42 as viewed from above on the inside and outside of the straight guide wall 36 on the left side of the figure are gradually spaced toward the front and rear guide walls 37 or 38 facing each other ( The groove width of the guide groove portion 34) is integrally extended so as to be narrowed, and before and after the substantially straight U-shaped spring pieces 41 are opposed to each other on the outer side of the straight guide wall 35 on the right side of the figure. The guide walls 37 and 37 are integrally extended so that a gradual interval (groove width of the guide groove portion 34) is narrowed toward the guide walls 37.

  As shown in FIG. 4 to FIG. 6, the corner portion of the substrate 3 c at the lower portion of the guide wall 37 between the distal end portion of the substantially U-shaped spring piece 41 of the straight guide wall 36 and each guide wall 37. Further, a plate-like rib 37 a whose upper end corner is inclined inward and downward is orthogonal to the guide wall 37 and integrally protrudes toward the tip of the spring piece 41. Thus, the filter holding and holding structure 30 according to the embodiment, which is a main part of the present invention, is configured. In the holding and holding structure 30 of the present example, the filter X having a side of 5.5 mm square cylinder and the filter Y having the same 3.0 mm square cylinder are sandwiched and held. That is, as shown in FIG. 6A, the filter X is pressed against the guide wall 37 at the distal end portion of the spring piece 41 between the distal end portions of the spring piece 41 and the front and rear guide walls 37 on the rib 37a. While being held, the filter Y is pressed against the rib 37a at the tip of the spring piece 41 between the tip of both sides of the spring piece 41 and the front and rear ribs 37a on the substrate 3c as shown in FIG. 6B. So as to hold it. In either case, the two front and rear portions of the filter X (Y) are pressed and sandwiched by the urging force of the spring piece 41 at both end portions of the spring piece 41, so that they can be held in a straight line.

  FIG. 6 (c) shows a filter holding / holding structure 30 ′ according to another embodiment, and between the guide wall 37 and the distal end portion of the substantially U-shaped spring piece 41 of the straight guide wall 36. The plate-like ribs 37b from which the corners are removed by inclining the upper corners and the middles from the middle part to the lower part in the height direction of the guide wall 37 are made perpendicular to the guide walls 37. And it protrudes integrally toward the tip of the spring piece 41. In the case of this example, the space between the front and rear guide walls 37 from the upper side to the lower side of the spring piece 41 is gradually reduced. Therefore, for example, a filter with a side of 7.0 mm square cylinder (or a cylinder with a diameter of 7 mm) to a filter with a diameter of 2.0 mm (or a cylinder with a diameter of 2 mm) can be sandwiched, and a mechanical splice with a 4 mm square cylinder. A heat-shrinkable protective tube having a diameter of 2 mm can also be sandwiched. 4 to 6 are provided with ribs 37a and 37b according to the first and second embodiments. The sandwiching and holding structures 30 and 30 'shown in FIGS. Needless to say, it can also be provided between the guide walls 38.

  In addition, as shown in FIGS. 1 to 3, a rectangular substrate portion 3d is formed so as to protrude from the substrate 3b into the opening 3a in the linear portion on the right side of each drawing, and a pair of left and right on the partial substrate 3d. Plate-shaped guide walls 43 and 44 are erected at intervals in the width direction. Accordingly, the support portion 45 that can support the optical relay adapter 50 (FIG. 1) from both sides between the guide wall 43 and the guide wall 44 and between the guide wall 44 and the straight guide wall 36.・ It is composed of 46. Although illustration is omitted, an optical signal input through the optical repeater adapter 50 is converted into an electric signal by an O / E converter in the device unit 21, and the converted electric signal is amplified to output terminals and Output from the monitor terminal.

  By the way, although the optical cable housing part 3 on the right side of FIG. 1 and the device unit 21 in the casing 1 below the same are illustrated, the optical cable housing part 3 on the left side in FIG. ing. However, in the case of this example, the device unit 22 accommodated in the housing 1 below the left-side optical cable housing 3 incorporates an amplifier that amplifies an optical signal transmitted by the optical cable, and is optically relayed by the optical cable. The optical signal input via the adapter 50 can be amplified by the amplifier in the left device unit 21 and transmitted again to the far side by the optical cable taken out from the optical cable entrance 33 of the left optical cable housing 3. The extra length portion winding structure (guide groove 34) of the optical cable is a known structure except for the holding structure 30/30 'for attachment members such as the above-described filters and mechanical splices. The detailed explanation is omitted because it is not particularly limited.

  As described above, the housing 1 of the optical receiver according to the embodiment of the present invention is configured. Next, usage modes will be described.

  Although illustration is omitted, an optical cable containing a support member is used as the optical cable. Usually, the optical cable housing portion 3 is removed and the optical cable is processed while the housing 1 is attached to the wall surface of the building. The elastic body holder 7 is inserted in the entrance / exit 33 of the accommodating portion 3 and the optical cable is inserted into the insertion groove from the cut. At this time, each insertion groove is in a position not sandwiched between the ribs 8 and 9. Then, with the optical cable inserted in each insertion groove, the elastic body holder 7 is slid downward, so that the insertion groove of the holder 7 is held at the holding surface with a narrowed downward distance between the opposing ribs 8 and 9. (Upper end open groove) is clamped, and the optical cable in the insertion groove is fastened together with the holder 7 and fixed.

As shown in FIG. 3, the optical cable is previously peeled off the optical fiber and the support member from the cover tube, and the optical cable is fixed to the elastic holder 7 of the doorway 33. The end of the support member is wound around the fixing screw of the portion 12, the fixing screw is screwed into the screwed portion and rotated in the tightening direction, thereby tightening the support member in a tension state. If a filter X (Y) is interposed in the middle of the optical cable, or a connection tool (not shown) such as a mechanical splice that connects the optical cable is interposed, those attachment members (filter X, etc.) Is held and held by the holding structure 30 (30 ′) provided in the straight portion of the guide groove 34. In this case, as described above, it is held and held at a location (between the spring piece 41 and the guide wall 37 or the ribs 37a and 37a ) that matches the size (width) of the attachment member. Further, even if the shape and dimensions of the attached member are changed from those of the existing product, the tip including the guide wall 37 and the ribs 37a and 37a are pressed by the tip of the spring piece 41, so the position in the vertical direction is There are things that can be dealt with by changing. However, in the case where it is not possible to cope with any position in the vertical direction, the protrusion amount of the ribs 37a and 37a is changed, but since one side is the spring piece 41, the spring piece 41 is relatively large. Deforms to cover a wide range.

  In this way, the optical cable is fixed along the frame wall 32 on one side (right side) of the accommodating portion 3. In this state, the extra length of the optical fiber is wound and accommodated, or the optical fiber is opened in the opening 3 a of the accommodating portion 3. The cable is pulled into the housing 1 and connected to an electronic device such as an O / E converter. In addition, in the state which processed the optical cable and accommodated in the accommodating part 3, the accommodating part 3 is inserted in the open surface 1a of the housing | casing 1. FIG. And if the fastener 5 is tightened after closing the lid | cover 2, a work will be complete | finished.

  Although the embodiment of the optical cable housing portion of the present invention has been described above, the optical cable device housing of the present invention can be implemented as follows.

  In the above embodiment, the spring member is the substantially U-shaped spring piece 41 and is integrated with the guide wall 36. However, the spring piece 41 can be formed separately from the guide wall 36 and detached from the guide wall 36. Can be fitted.

  The spring member can be made of a synthetic rubber having a high elasticity, a non-metallic leaf spring structure, or a coil spring structure, and can be mounted on the opposite guide wall 36 so as to face the front and rear guide walls 37.

  -You may comprise a spring member by attaching a resin-made press board to the contact part with a filter of metal leaf | plate springs or coil springs.

  The guide wall 37 facing the front end of the spring piece 41 is separated in the front and rear to form the void 37c, but the front and rear guide walls 37 and 37 can be formed in a series of continuous guide walls.

  -Plate-shaped ribs 37a and 37b are separated from the guide wall 37, and a plurality of types of plate-shaped ribs with different protruding lengths are formed in advance. For example, a fitting groove is provided in the guide wall 37 and the ribs 37a and 37b are attached and detached. It may be possible to replace it. In this way, by preparing in advance a plurality of types of plate-like ribs having different projecting lengths, it is possible to mount plate-like ribs that are compatible with changes in the size and shape of the attached member.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external perspective view which shows the optical cable apparatus housing | casing provided with the optical cable accommodating part which concerns on the Example of this invention, and represents the state which open | released the lid | cover. It is a perspective view which shows one optical cable accommodating part of the optical cable apparatus housing | casing of FIG. It is a top view which shows one optical cable accommodating part of the optical cable apparatus housing | casing of FIG. FIG. 4A is a perspective view in which the direction is changed from that in FIG. 2, and the main part of the present invention is circled, and FIG. 4B is a perspective view showing an enlarged view thereof. FIG. 5A is an enlarged view of the main part of FIG. 3, and a plan view showing a state in which a wide (thick) filter is sandwiched and held, and FIG. 5 (b) is a narrow (thin) width. It is a top view which shows the state which clamped and hold | maintained the filter. 6 (a) is a front view of FIG. 5 (a), FIG. 6 (b) is a front view of FIG. 5 (b), and FIG. 6 (c) is a front view showing another embodiment. It is an arrow view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical cable apparatus housing | casing 2 Lid 3 Optical cable accommodating part 3a Opening part 3b Substrate 3c Partial substrate 4 Locking plate 5 Fastener 7 Elastic body holder 8/9 Rib 12 Fixing screw hole 31/32 Frame wall 33 Entrance / exit 30 of optical cable 30 'clamping holding structure 34 path (guide groove part)
35 Guide Wall 36 Straight Guide Wall 37 Straight Guide Wall 37a / 37b Rib 37c Space (Space)
38 Straight guide wall 41 Spring piece (spring member)
42 Spring piece (spring member)
43/44 Plate-shaped guide walls 45/46 Support section X / Y filter

Claims (1)

In an optical cable device housing provided with an optical cable storage portion that can be accommodated by winding an optical cable in a loop shape,
From one guide wall of the guide groove that extends in a straight line so that an attachment member such as a connector for connecting the optical cable or a filter connected to the optical cable can be sandwiched in at least one place in the middle of the guide groove for winding the optical cable of the housing portion The spring member is provided toward the opposite guide wall so that a predetermined interval is provided with respect to the guide wall, and
Ribs projecting from the guide walls facing each other such that the gap between the spring members gradually decreases from the upper side toward the lower side,
The spring member is composed of a pair of flexible resin spring pieces integrally extended from one of the guide walls in a substantially U shape when viewed from above along the front-rear direction of the guide groove portion, While projecting the ribs orthogonal to the opposing guide walls so that the distance between the front and rear end portions of the front and rear spring pieces gradually decreases from the upper side to the lower side,
The guide wall facing the spring piece is composed of a pair of plate-like walls intermittently standing in the front-rear direction, and a space is provided between the front and rear plate-like walls to allow at least one finger to enter. optical cable accommodating portion of the optical cable apparatus housing, characterized in that there.

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