Optical terminal device housing

Abstract

To provide a housing for an optical terminal device with which it is possible to heighten dust resistance.SOLUTION: A cable cover 35 comprises a connection part 351, an inclined part 352, a return part 353, and a protruding part 354. The connection part 351 is a rectangular tabular member for connecting to a pull-in opening 31. The inclined part 352 is a tabular member for connecting to the connection member 351 at an angle. The inclined part 352 has such an inclination as to rise, as seen from the pull-in opening 31. The return part 353 is a tabular member that connects to an edge of the inclined part 352, connecting to the top surface of the inclined part 352 perpendicularly so as to rise to the upper side.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a housing for an optical network unit having an inlet for an optical cable. [Background technology]

[0002] In broadcasting and communication systems using optical cables such as FTTH, optical network units (ONUs) that convert optical signals from the optical cable into electrical signals and output them are installed outdoors at each subscriber's home.

[0003] Patent Documents 1 and 2 describe optical terminal devices. As in Patent Documents 1 and 2, the housing of the optical terminal device has a box-shaped main body, a lid that covers the upper part of the main body, and a tray that is placed on the upper part of the main body and divides the main body into upper and lower parts. A power supply unit and a photoelectric conversion unit are stored in the lower part of the tray inside the main body, and an excess part of the optical cable is stored on the tray inside the main body.

[0004] Patent Document 2 describes providing a cylindrical inlet tray through which an optical cable passes in an optical cable inlet of a housing, and providing a plate-like body that is cut into a U-shape (with the opening side of the U-shape facing the inside of the housing) and bent and tilted inside the tube. For the optical cable inlet that is to be used, the plate-like body is pushed outside the tube and returned to its original state, making it possible to pass the optical cable inside the inlet tray. On the other hand, for the optical cable inlet that is not used, the inlet is blocked by the plate-like body, thereby preventing dust and water from entering the inside of the housing. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-211528 A [Patent Document 2] JP2014-115485Publication Summary of the Invention [Problem to be solved by the invention]

[0006] However, the housing of the conventional optical network unit has a problem of low dust resistance. The reason is as follows.

[0007] There are no standards for the shape or thickness of optical cables, and they are not standardized. For this reason, in the past, this was addressed by making the inlet for the optical cable larger. As a result, when the optical cable was inserted into the inlet, a gap sometimes occurred between the inlet and the optical cable. Optical terminal devices are often installed outdoors, such as on the walls of houses, and there was a problem of insects and other foreign objects getting in through such gaps. In the past, the gaps were filled with cushioning material, which was time-consuming and difficult to work with. In addition, unused inlets had to be blocked off.

[0008] In addition, in Patent Document 2, a portion of the pull-in tray is cut and folded, so that the pull-in tray has a hole, the pull-in opening is not completely sealed, and dust-proofing is insufficient.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a housing for an optical terminal device that can improve dust resistance. [Means for solving the problem]

[0010] The present invention is a housing for an optical terminal device that houses a tray for storing an optical cable and a converter for converting an optical signal from the optical cable into an electrical signal, the tray having an inlet for drawing the optical cable into the inside of the tray and a gripper connected to the inlet, the gripper having a box-like shape with an open top and a gripper main body for fixing the optical cable drawn into the inside of the tray from the inlet, a gripper cover connected to the gripper main body and capable of opening and closing an upper part of the gripper main body, and a gripper cover connected to the inlet or an inner bottom surface of the gripper main body, disposed inside the gripper main body, and adapted to be opened from the side of the inlet or the bottom surface of the gripper main body. Topand a flat spring-like cable cover having a restoring force on the side of the cable cover, the cable cover being inclined with respect to the inlet or the inner bottom surface of the gripping body when the optical cable is not inlet, the inclination being such that the inclination is from the inlet to the inner side of the tray. As we move towards From the bottom of the intake Top and a plate-shaped return portion connected to the upper surface of the inclined portion at an angle to the upper surface, and the gripper body is configured such that, when the upper portion of the gripper body is closed by the gripper lid and the optical cable is pulled in, the cable lid is pushed downward by the optical cable compared to a state in which the optical cable is not pulled in, the gripper lid and the optical cable come into contact with each other at their contact surfaces, and the return portion and the optical cable come into contact with each other, and when the upper portion of the gripper body is closed by the gripper lid and the optical cable is not pulled in, the return portion comes into contact with the gripper lid. the angle between the inclined portion and the return portion is set so that when a thin wire is inserted from the inlet, the thin wire hits the return portion and the cable cover is not pushed downward, whether the optical cable is in a retracted state or not. The present invention relates to a housing for an optical terminal device.

[0011] In the present invention, the bottom surface of the inlet may be located higher than the bottom surface of the grip body.

[0012] In the present invention, the inclined portion has a plate-shaped first portion connected to the inner bottom surface of the inlet, and a plate-shaped second portion connected at an angle to an end of the first portion, and the return portion may be connected to the second portion at an end of the second portion opposite the first portion connection side.

[0013] In the present invention, the inclined portion has a plate-shaped first portion connected to the inner bottom surface of the grip body and a plate-shaped second portion connected at an angle to an end of the first portion, and the return portion may be connected to the second portion at an end of the second portion opposite the first portion connection side. Effect of the Invention

[0014] According to the present invention, it is possible to improve the dustproofness of the housing of the optical terminal device. [Brief description of the drawings]

[0015] [Figure 1] 2 shows the configuration of the housing of the optical terminal device of the first embodiment, with the cover 2 closed. FIG. [Diagram 2] 1 is a diagram showing the configuration of a housing of the optical terminal device of the first embodiment, with a cover 2 open. FIG. [Diagram 3] A diagram showing the configuration of tray 3. [Figure 4] 3A and 3B are diagrams showing the configuration of a gripping portion 32. [Diagram 5] 3A and 3B are diagrams showing the configuration of a gripping portion 32. [Figure 6] 3A and 3B are diagrams showing the configuration of a gripping portion 32. [Figure 7] 4A and 4B are diagrams showing the structure of a cable cover 35. [Figure 8] A diagram showing the optical cable inserted. [Figure 9] A diagram showing the wires inserted. [Figure 10] A diagram showing the state in which the optical cable is not pulled in. [Figure 11] A diagram showing the wires inserted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

[0017] 1 and 2 are diagrams showing the housing of the optical network unit of the first embodiment, and are perspective views seen from above. As shown in Figs. 1 and 2, the housing of the optical network unit has a box-shaped main body 1, a lid 2 that seals the upper part of the main body 1, and a tray 3 that stores an optical cable. Fig. 1 shows a state in which the lid 2 is closed, and Fig. 2 shows a state in which the lid 2 is open.

[0018] The main body 1 is a rectangular box made of resin, and the top is open. The main body 1 has a rectangular bottom plate 11, two side plates 12 and 13 connected perpendicularly to the short sides of the bottom plate 11, and two side plates 14 and 15 connected to the long sides. The side plate 13 has a hole 16 for passing a coaxial cable and a hole 17 for passing a power cable. The hole 17 can be opened and closed by a slide lid. The internal space of the main body 1 is divided by the tray 3 into a lower space (space between the bottom plate 11 and the bottom of the tray 3) and an upper space (space above the tray 3). The lower space contains a power supply unit and a photoelectric conversion unit (neither of which is shown). The power supply unit corresponds to the power supply unit of the present invention, and the photoelectric conversion unit corresponds to the conversion unit of the present invention. The power supply unit is connected to the photoelectric conversion unit, and is a device that supplies power to the photoelectric conversion unit. The power supply unit is connected to a power cable, and power is supplied to the power supply unit from a commercial power source via the power cable. The power cable is pulled into the main body 1 through a hole 17 in the side plate 13. The photoelectric conversion unit is a device that converts the optical signal from the optical cable into an electrical signal and outputs it. A coaxial cable that transmits the electrical signal is connected to the photoelectric conversion unit, and the coaxial cable is taken out to the outside of the main body 1 through a hole 16 in the side plate 13.

[0019] The power supply unit does not necessarily have to be housed inside the main body 1, and may be disposed outside the main body 1 if it is far from a commercial power source.

[0020] The lid 2 is made of resin and has an upper plate 21 that covers the upper part of the main body 1, and side plates 22, 24, and 25 that are connected perpendicularly to each side of the upper plate 21 and cover the side plates 12, 14, and 15, respectively. The side plate 13 of the main body 1 is not covered by the lid 2. In addition, the lid 2 is rotatably connected to the side plate 12 side ends of the side plates 24 and 25 of the main body 1 at the side plate 22 side ends.

[0021] The tray 3 is made of resin and is stored in the upper interior portion of the main body 1. Fig. 3 is a view of the tray 3 as viewed from above. Protrusions are provided on the inner surfaces of the side plates 12 and 13 of the main body 1, and the tray 3 is placed on the protrusions so that the tray 3 is detachably disposed in the upper interior portion of the main body 1. The tray 3 is box-shaped with an open top, and has a hole in the bottom portion through which an optical connector that connects to the photoelectric conversion unit can pass.

[0022] The tray 3 further has an optical cable inlet 31 and a gripping portion 32 provided near the inlet 31 for gripping the optical cable. The optical cable drawn in from the inlet 31 has its posture and position fixed by the gripping portion 32, after which the core wire is drawn out and wound, and the surplus portion is stored on the tray 3. The tray 3 is provided with a partition for guiding the core wire to facilitate winding. An optical connector for connecting to a photoelectric conversion unit is also arranged on the tray 3. The core wire end of the optical cable stored in the tray 3 is connected to the photoelectric conversion unit via the optical connector. The tray 3 is also provided with a partition capable of storing optical components such as a mechanical splice and a WDM filter.

[0023] The inlets 31 are provided at the ends of the side plates 30 of the tray 3. The side plates 30 are the side plates that contact the side plate 13 of the main body 1 among the four side plates of the tray 3. The inlets 31 are divided into two adjacent square tubes by a partition plate 316. An optical cable is passed through the inside of the square tube. The bottom surface 311 inside the square tube is parallel to the bottom surface of the tray 3 and the bottom plate 11 of the main body 1, and the side surfaces 314 and 315 are parallel to the side surfaces of the tray 3 and the side plates 14 and 15 of the main body 1. In the first embodiment, the partition plate 316 is provided to divide the square tube into two so that two optical cables can be passed through, but the partition plate 316 is not necessary when one optical cable is passed through. In addition, the partition plate 316 may be used to divide the square tube into three or more square tubes so that three or more optical cables can be passed through.

[0024] The gripping parts 32 are made of resin and are provided in the vicinity of the inlets 31. The gripping parts 32 have a gripping part main body 33, a gripping part lid 34, and a cable lid 35. Figures 4 and 5 are diagrams showing the configuration of the gripping part 32, with Figure 4 showing the gripping part main body 33 closed by the gripping part lid 34, Figure 5 showing the gripping part main body 33 with the upper part open, and Figure 6 showing the gripping part main body 33 with the upper part open and the cable lid 35 extended.

[0025] The grip body 33 has a bottom plate 331 and side plates 333-335 connected perpendicularly to the bottom plate 331, and has a box-like structure with an open upper portion. The inlet 31 is connected to the side plate 333. The inside of the rectangular tube of the inlet 31 and the inside of the grip body 33 are continuous.

[0026] The grip body 33 also has three upright plates 336 that are connected perpendicularly to the bottom plate 331 and parallel to the side plates 334 and 335. The three upright plates 336 are arranged at equal intervals. Furthermore, on the surfaces of the upright plates 336 that face each other, a protrusion 337 is provided that is linear and perpendicular to the bottom plate 331 and protrudes in the facing direction. The optical cable drawn into the grip body 33 from the inlet 31 is passed through the gap between the upright plates 336, and is fixed in its posture and position by contacting the protrusion 337. Depending on the type and thickness of the optical cable, the optical cable is passed through the gap between the side plate 334 and the upright plate 336, or the gap between the side plate 335 and the upright plate 336. The upright plates 336 do not need to be at equal intervals. For example, by changing the intervals, more types of optical cables can be fixed in the gaps between the upright plates 336. Also, the number of upright plates 336 does not need to be three, and a plurality of plates may be provided according to the number of optical cables to be inserted. Also, the upright plates 336 do not need to be provided as long as the inserted optical cables can be held.

[0027] The gripper lid 34 has an upper plate 341 that covers the gripper main body 33 and the upper part of the inlet 31, and a side plate 346 that covers the side plate 334 of the gripper main body 33. An end of the upper plate 341 and an upper end of the side plate 335 of the gripper main body 33 are connected, and can be bent at the connection portion. In addition, a protrusion is provided on the outside of the side plate 334 of the gripper main body 33, and a hole into which this protrusion is fitted is provided in the side plate 346 of the gripper lid 34. When the upper part of the gripper main body 33 is closed by the gripper lid 34, the protrusion on the outside of the side plate 334 fits into the hole in the side plate 346, thereby maintaining the closed state.

[0028] A protrusion 347 is provided on the surface of the upper plate 341 facing the grip body 33. The protrusion 347 has a width set so as to engage with the gap between the upright plates 336 when the grip lid 34 is closed. Therefore, when the grip lid 34 is closed, the spacing between the upright plates 336 is fixed by the protrusion 347, so that when an optical cable is passed between the upright plates 336, the spacing between the upright plates 336 does not widen, and the optical cable can be stably fixed. Note that the protrusion 347 may not be provided, and the optical cable may be held by only the rigidity of the side plates 334, 335 and the upright plates 336.

[0029] Cable lid 35 is a lid that is foldably connected to the bottom surface inside the square tube of inlet 31. As shown in Fig. 6, cable lid 35 is located outside grip body 33 when not folded, and is folded so as to be located inside grip body 33.

[0030] 7 is a diagram showing the structure of the cable cover 35, in which (a) is a diagram of the cable cover 35 seen from above when the cable cover 35 is folded and positioned inside the grip body 33, and (b) is a diagram of the cable cover 35 seen from the side. As shown in FIG. 7, the cable cover 35 has a connection part 351 (corresponding to the first part of the present invention), an inclined part 352 (corresponding to the second part of the present invention), a return part 353, and a protrusion part 354. For ease of explanation, the direction in the plane of the bottom plate 331 of the grip body 33 in which the optical cable is pulled in is defined as the x-axis direction, the direction in the plane of the bottom plate 331 of the grip body 33 perpendicular to the x-axis is defined as the y-axis direction, and the direction perpendicular to the x-axis and y-axis (direction perpendicular to the bottom plate 331 of the grip body 33) is defined as the z-axis direction.

[0031] The connection portion 351 is a rectangular plate-like member that is connected to the inlet 31. The width (y-axis direction) of the connection portion 351 is slightly narrower than the width of the inlet 31.

[0032] The inclined portion 352 is a plate-like member connected to the connecting portion 351 at an angle. The inclined portion 352 has an inclination that rises when viewed from the inlet 31. When viewed from the z-axis direction, the inclined portion 352 has an elongated rectangular portion in the x-axis direction that is connected to the connecting portion 351 and has the same width as the connecting portion 351, and an elongated rectangular portion in the y-axis direction that is connected to the portion, and has an L-shape. The angle formed by the connecting portion 351 and the inclined portion 352 is, for example, 10 to 60 degrees. When the cable cover 35 is folded inside the grip body 33, the connecting portion 351 and the bottom surface of the inlet 31 come into contact with each other on a surface. Then, when the cable cover 35 is pushed further downward from the state in which the connecting portion 351 and the bottom surface of the inlet 31 come into contact with each other on a surface, the inclined portion 352 is bent downward with the connecting point between the connecting portion 351 and the inclined portion 352 as a fulcrum, and a restoring force acts to return the inclined portion 352 to its original state. In this manner, the ramps 352 act as leaf springs.

[0033] The return portion 353 is a plate-like member that is connected to the end of the inclined portion 352 and is connected perpendicularly to the upper surface of the inclined portion 352. As shown in FIG. 7(b), the inclined portion 352 and the return portion 353 are connected in an L-shape when viewed from the zx plane. Note that the connection does not necessarily have to be perpendicular, and it may be connected in such a manner that the optical cable is pulled in when the upper portion of the gripper main body 33 is closed by the gripper cover 34. Not yet In this state, the angle of the return portion 353 may be set to be greater than 0° and less than or equal to 120° with respect to the contact surface between the optical cable and the gripping portion lid 34. More preferably, the angle is greater than or equal to 30° and less than or equal to 90°. The contact between the optical cable and the gripping portion lid 34 does not have to be a surface contact as long as the position of the optical cable 500 can be maintained, and may be a contact at multiple points or lines. The role of the return portion 353 will be described later.

[0034] The protrusion 354 is a convex portion connected to the side of the inclined portion 352 and protruding in the y-axis direction. The cable lid 35 bent inside the grip body 33 attempts to return to the outside of the grip body 33 due to a restoring force. Therefore, the protrusion 354 is hooked on the partition plate 316 to prevent the cable lid 35 from returning to the outside of the grip body 33 due to the restoring force (see FIG. 5). If the protrusion 354 hooked on the partition plate 316 is removed by bending the cable lid 35 or the grip body 33, the cable lid 35 can be returned to the outside of the grip body 33 and put into an unbent state as shown in FIG. 6. However, the protrusion 354 is not necessarily required to be provided.

[0035] FIG. 8 is a diagram showing a state in which the upper part of the gripper body 33 is closed by the gripper lid 34, the optical cable 500 is pulled in from the inlet 31, and the optical cable 500 is fixed to the gripper 32. As shown in FIG. 8, when the optical cable 500 is pulled in, the return part 353 of the cable lid 35 comes into contact with the optical cable 500, and the cable lid 35 is pushed downward. The pushed-in cable lid 35 always comes into contact with and presses the optical cable 500 because it tries to return upward by a restoring force. Therefore, regardless of the shape and thickness of the optical cable 500, the cable lid 35 always comes into contact with the optical cable 500, and the gap of the inlet 31 is automatically blocked by the cable lid 35. In addition, the optical cable 500 comes into contact with the gripper lid 34 at the upper part. In this way, the lower part of the optical cable 500 comes into contact with the return part 353, and the upper part comes into contact with the gripper lid 34. Therefore, the position of the optical cable 500 can be maintained, and furthermore, since no gaps are created above or below the optical cable 500, foreign objects such as insects are prevented from entering.

[0036] 10 is a diagram showing a state in which the upper part of the gripping part main body 33 is closed by the gripping part lid 34 and the optical cable 500 is not pulled in from the inlet 31. As shown in FIG. 10, in a state in which the optical cable 500 is not pulled in, the return part 353 of the cable lid 35 comes into contact with the upper plate 341 of the gripping part lid 34. Therefore, the gap of the inlet 31 is automatically blocked by the cable lid 35.

[0037] 9 and 11, when the thin wire 600 is inserted from the inlet 31, the tip of the wire 600 hits the return portion 353 of the cable cover 35. Therefore, the cable cover 35 is not pushed downward by the wire 600. In this way, the return portion 353 is provided to prevent the wire 600 from entering from the inlet 31.

[0038] The bottom surface 311 of the inlet 31 is preferably located higher than the bottom plate 331 of the grip body 33. Since the cable lid 35 is provided with the return portion 353, if the bottom surface 311 of the inlet 31 and the bottom plate 331 of the grip body 33 are at the same height, the position where the optical cable 500 contacts the return portion 353 when the optical cable 500 is drawn in is at a position higher than the bottom surface 311 of the inlet 31, and the attitude of the optical cable 500 may become inclined. Therefore, if the bottom surface 311 of the inlet 31 is made higher than the bottom plate 331 of the grip body 33, the cable lid 35 can be bent downward from the bottom surface 311 of the inlet 31. As a result, the position where the optical cable 500 contacts the return portion 353 can be brought closer to the height of the bottom surface 311 of the inlet 31, and the attitude of the optical cable 500 can be brought closer to parallel.

[0039] As described above, in the housing of the optical network unit of the first embodiment, no matter what shape or thickness of optical cable is inserted into the inlet 31, the gap of the inlet 31 can be blocked by the cable cover 35. Even if a wire is inserted from the inlet 31, the wire will not enter the inside. Therefore, the dustproofness of the optical network unit can be improved.

[0040] (Modification) In the first embodiment, the connection part 351 of the cable cover 35 is connected to the bottom surface 311 of the inlet 31, but it may be connected to the inner bottom surface of the grip body 33. Also, it may be configured such that the inclined part 352 is directly connected to the bottom surface 311 of the inlet 31 or the inner bottom surface of the grip body 33 without providing the connection part 351. [Industrial Applicability]

[0041] The present invention can be used as a housing for an optical terminal device. [Explanation of symbols]

[0042] 1: Main body 2: Lid 3: Tray 31: Entrance 32: Grip part 33: Grip body 34: Grip cover 35:ケーブル cover 351:Jiebu 352: inclined portion 353:Return to the Department 354: protrusion

Claims

1. A housing of an optical network unit that houses a tray for housing an optical cable and a conversion unit for converting an optical signal from the optical cable into an electrical signal, The tray has an inlet for drawing the optical cable into the tray; A gripping portion connected to the inlet; having The gripping portion is a gripping portion main body having an open top and configured to fix the optical cable that is drawn into the tray from the inlet; A gripping portion lid that is connected to the gripping portion main body and can open and close an upper portion of the gripping portion main body; a leaf spring-like cable cover that is connected to the inlet or the inner bottom surface of the grip body, is disposed inside the grip body, and has a restoring force from the inlet or the bottom surface side of the grip body to an upper side; having The cable cover includes: a plate-shaped inclined portion that is inclined with respect to the inlet or the inner bottom surface of the gripping portion body when the optical cable is not inserted, the inclination being an upward inclination from the bottom surface of the inlet toward the upper portion as it goes from the inlet toward the inner side of the tray; A plate-shaped return portion is connected to an upper surface of the inclined portion at an angle to the upper surface, when an upper portion of the grip body is closed by the grip lid and the optical cable is pulled in, the cable lid is pushed downward by the optical cable compared to a state in which the optical cable is not pulled in, and the grip lid and the optical cable come into contact with each other at their contact surfaces, and the return portion and the optical cable come into contact with each other; When the upper part of the grip body is closed by the grip lid and the optical cable is not pulled in, the return part comes into contact with the grip lid, The angle between the inclined portion and the return portion is set so that when a thin wire is inserted from the inlet, the thin wire hits the return portion and the cable cover is not pushed downward, whether the optical cable is in a retracted state or not. A housing for an optical terminal device.

2. 2. The housing of the optical terminal device according to claim 1, wherein a bottom surface of the inlet is located higher than a bottom surface of the grip body.

3. The inclined portion has a plate-shaped first portion connected to an inner bottom surface of the inlet and a plate-shaped second portion connected to an end portion of the first portion at an angle, The return portion is connected to the second portion at an end portion opposite to the first portion connection side of the second portion.

3. The housing of the optical terminal device according to claim 1 or 2.

4. The inclined portion has a plate-shaped first portion connected to the inner bottom surface of the grip body and a plate-shaped second portion connected to an end of the first portion at an angle, The return portion is connected to the second portion at an end portion opposite to the first portion connection side of the second portion.

3. The housing of the optical terminal device according to claim 1 or 2.

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