JP2015121725A - Optical terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical terminal device that can house the extra lengths of optical fibers in an extra length housing tray while putting them in order.SOLUTION: A first guide part 41a to a fourth guide part 41d and outer guide parts 46a-46e for winding and housing the extra lengths of optical fibers are formed in such a manner that they are erected from a bottom surface part 4a of an extra length housing tray 4. The plurality of guide parts are formed with an upper stage holding claw 42a and a lower stage holding claw 42b at a predetermined interval. The extra lengths of the optical fibers can be housed by being separated into: a space between the bottom surface part 4a and the lower stage holding claw 42b; and a space between the upper stage holding claw 42a and the lower stage holding claw 42b.

Description

  The present invention relates to an optical terminal device having a function of converting an optical signal input from an optical fiber into an electrical signal and outputting the electrical signal, and including an extra length storage unit for storing an extra length of an optical fiber introduced into a housing. is there.

  In recent years, with the widespread use of high-speed broadband communication services, communication services for connecting homes and transmitting stations with optical cables, such as optical cable television (CATV), have been implemented. In order to realize this communication service, there is an optical terminal device for demodulating an optical signal transmitted through an optical fiber by converting the optical signal into an electrical signal and supplying the demodulated CATV signal to a set top box or a coaxial CATV line. Necessary. In the case of a general optical terminal device, there is an extra length storage unit that stores the extra length of the introduced optical fiber, and an optical receiver that converts the optical signal from the introduced optical fiber into an electrical signal and outputs it. Has been. And the power supply part which supplies a power supply to this optical receiving part is incorporated in the housing | casing of the optical terminal device.

FIG. 17 shows a perspective view showing an example of the configuration of a conventional optical terminal device having the same configuration as the optical terminal device described in Patent Document 1, and FIG. The conventional optical terminal device 100 includes a housing including a main body 102 and a lid 103 fitted to the main body 102, but the lid 103 is omitted in FIG.
The main body 102 has a rectangular box shape with an upper surface opened. A power supply unit (not shown) and an electronic circuit unit (not shown) are housed inside the main body unit 102, and a power cable 161 drawn from the power supply unit is led out from a cable insertion hole 160 formed on the right side of the front surface. . In FIG. 17, the power cable 161 is omitted. In addition, a plurality of coaxial terminals 151 provided on the front surface of the electronic circuit unit protrude outside from a cylindrical terminal hole formed on the front surface of the main body 102. Furthermore, the mounting piece 102d is formed so as to protrude from the left and right sides of the lower end of the front surface of the main body 102. By inserting a screw through the insertion hole formed in the mounting piece 102d and screwing it to the building wall or the like, The optical terminal device 100 can be installed on the wall of a building.
Here, the lid 103 is pivotally attached to the main body 102 so as to be openable and closable with pivots 102 d formed on the rear portions of both side surfaces of the main body 102 as rotation axes. When the lid 103 is opened, a force directed upward is applied to the extending portion 103b formed to extend forward from the plate on the upper surface of the lid 103 by applying a finger from below. As a result, the pair of engaging pieces 103c formed downward from the front edge of the extending portion 103b is disengaged from the engaging protrusions 102c formed on both sides of the upper portion of the front surface of the main body 102, and the lid 103 Can rotate the pivot 102d as a rotation axis to open the lid 103 from the main body 102.

  As shown in FIG. 17, a surplus length storage tray 104 made of resin is placed on the power supply unit and the electronic circuit unit built in the main body unit 102, and the power supply unit and the electronic circuit unit are placed in the casing of the optical terminal device 100. The electronic circuit unit and the extra length storage tray 104 are built in. The extra-length storage tray 104 has a rectangular bottom surface and side walls 104 a erected from the four sides of the bottom surface, and is approximately the same size as the inner shape of the main body 102. The surplus length storage tray 104 is formed with a plurality of arcuate guide walls 141 and elliptical guide walls 141 formed upright from the bottom, and the upper edges of these guide walls 141 go to the tip. A plurality of pressing claws 142 are formed at predetermined intervals so that the width becomes narrower and protrudes in an eaves shape. Further, sandwiching portions 145 are formed on both sides of the front side of the extra length storage tray 104, and are introduced from an optical fiber introduction hole 102a formed as an elongated rectangular groove formed on both sides of the upper portion of the front surface of the main body portion 102. The optical fiber thus fixed is fixed at the sandwiching portion 145. Sawtooth-shaped protrusions are formed on the sandwiching portion 145 so as to face each other, and can be fixed by sandwiching the optical fiber therebetween.

  Although not shown, an optical connector is provided at the tip of the optical fiber introduced into the optical terminal device 100. By attaching this optical connector to the optical connector of the electronic circuit unit, the optical circuit unit is optically connected. A signal is input. In this case, since the length of the optical fiber is laid out with a margin, an extra length is generally generated in the optical fiber introduced into the optical terminal device 100. The extra length of the optical fiber can be stored in the extra length storage tray 104 built in the optical terminal device 100. The extra length of the optical fiber introduced into the optical terminal device 100 can be wound around and stored in the plurality of guide walls 141 in the extra length storage tray 104 described above. In this case, since the optical fiber has elasticity, when it is wound, it is biased in the direction in which the winding diameter increases. Thus, the plurality of pressing claws 142 are formed on the upper edge of the guide wall 141 so as not to get over the guide wall 141 even when the optical fiber is urged in the direction in which the winding diameter increases.

  In the conventional optical terminal device 100, as in the optical terminal device described in Patent Document 2, the power supply unit is detachable from the optical terminal device 100, and the power supply unit is taken out from the optical terminal device 100 and externally connected. Can be provided. In this case, although not illustrated, the power supply unit is provided with a coaxial terminal, and the power supply unit provided outside is connected by connecting the coaxial cable connected to the coaxial terminal to the coaxial terminal 151 of the optical terminal device 100. Thus, power is supplied to the electronic circuit unit built in the optical terminal device 100. When the power supply unit is taken out from the optical terminal device 100, the power cable 161 drawn out from the power supply unit is also removed, so that the main unit 102 from which the power supply cable 161 is drawn out as shown in FIG. The front cable insertion hole 160 becomes vacant. Then, since rainwater or the like may enter the optical terminal device 100 from the vacant cable insertion hole 160 and cause trouble, the waterproof cap 121 is fitted into the cable insertion hole 160 to close it. The waterproof cap 121 includes a rectangular head 121a and two legs 121b extending in parallel from both sides of the lower surface of the head 121a. A wedge-shaped engagement portion is formed at the tip of the foot portion 121b. When the waterproof cap 121 is fitted into the cable insertion hole 160, the two foot portions 121b are elastically engaged with the cable insertion hole 160. Come together.

  A state where the waterproof cap 121 is fitted in the cable insertion hole 160 is shown in FIG. Since the waterproof cap 121 is unnecessary and may be lost when the power supply unit is stored in the optical terminal device 100, the waterproof cap 121 that is no longer required is stored in the optical terminal device 100 and lost. Try to prevent. Specifically, as shown in FIG. 20, a sandwiching portion 147 in which two planar plates face each other is formed inside an elliptical guide wall 141, and a waterproof cap 121 is formed between the sandwiching portions 147. The two legs 121b can be elastically sandwiched.

  Incidentally, there are cases where optical fibers are connected to each other in the housing of the optical terminal device 100. When the optical fibers are connected to each other by fusing the end faces of the optical fibers, a sleeve that protects the fused portion is attached to the fused portion. In addition, optical fibers are also connected by a mechanical splice that aligns and fixes the end faces of the optical fibers. Such a sleeve and mechanical splice are accommodated in a housing together with the extra length of the optical fiber. Then, since sleeves and mechanical splices are thicker than optical fibers and are heavier than optical fibers and cannot be bent, the optical fibers may be bent and damaged when they are moved so that they do not move in the housing. Occurs. Therefore, like the optical terminal device described in the cited document 3, the conventional optical terminal device 100 is provided with sleeve holding portions 144 for holding sleeves and mechanical splices on both sides of the center of the extra length storage tray 104. ing. The sleeve holding portion 144 that holds the sleeve and the mechanical splice is composed of a wall portion and a holding piece facing the wall portion, and the sleeve and the mechanical splice are elastically held between the wall portion and the holding piece. .

JP-A-2005-191211 JP 2005-276937 A JP 2005-189438 A

  In the conventional optical terminal device 100, the extra lengths of the introduced optical fibers are various lengths. When the extra length of the optical fiber is long, it becomes difficult to store the extra length of the optical fiber in the extra length storage unit while organizing the extra length of the optical fiber, and the extra length of the stored optical fiber may be messy. As a result, there is a problem that workability such as maintenance is deteriorated, appearance is bad, and transmission characteristics may be deteriorated in the worst case.

  Therefore, an object of the present invention is to provide an optical terminal device that can be accommodated in an extra length storage tray while organizing the extra length of an optical fiber.

  An optical terminal device according to the present invention includes an electronic circuit unit that converts an optical signal transmitted by an optical fiber into an electrical signal and outputs the electrical signal, a power supply unit that supplies power to the electronic circuit unit, the electronic circuit unit, and the power supply unit An extra length storage tray for accommodating the extra length of the introduced optical fiber, a main body portion for accommodating the electronic circuit unit, the power supply unit, and the extra length storage tray, and the main body portion. A plurality of guide portions that can be accommodated by winding the surplus length of the optical fiber from the bottom surface portion of the surplus length storage tray. A plurality of pressing claws that are formed upright and that prevent the optical fibers stored in the plurality of guide portions from popping out have a plurality of levels at different heights in the guide portions. Made is which, the pressing pawl are the most important feature that it is formed substantially parallel to eaves to the bottom portion.

  In the optical terminal device of the present invention, a plurality of holding claws for preventing the optical fiber stored in the guide portion from jumping out are formed in a plurality of stages at different heights on the guide portion. It becomes possible to wind in a plurality of stages. Thereby, the extra length of the optical fiber can be stored in the extra length storage tray while arranging.

It is a perspective view which shows the structure of the optical terminal device concerning the Example of this invention. It is a perspective view which shows a structure when a cover part is opened in the optical terminal device concerning the Example of this invention. It is a perspective view which shows the other structure when a cover part is opened in the optical terminal device concerning the Example of this invention. It is a perspective view which shows the structure of the extra length storage tray of the optical terminal device concerning this invention. It is a top view which shows the structure of the extra length storage tray of the optical terminal device concerning this invention. It is a top view which shows the 1st, 2nd aspect which winds an optical fiber around the surplus length storage tray of the optical terminal device concerning this invention. It is a top view which shows the 3rd, 4th aspect which winds an optical fiber around the extra length storage tray of the optical terminal device concerning this invention. It is a top view which shows the 5th aspect which winds an optical fiber around the extra length storage tray of the optical terminal device concerning this invention. It is the perspective view which expands and shows the structure of a part of extra length storage tray of the optical terminal device concerning this invention, and AA sectional view. It is the perspective view which expands and shows the one part structure for contrasting the structure of the extra length storage tray of the optical terminal device concerning this invention, and a BB sectional drawing. It is the perspective view and top view which show the structure of the state which mounted | wore the extra length storage tray of the optical terminal device concerning this invention with the sheet | seat. It is a perspective view which expands and shows the other part of the extra length storage tray of the optical terminal device concerning this invention, and a perspective view which shows a part of structure of the state which mounted | wore the sheet | seat. It is the top view and perspective view which show the structure of the sheet | seat with which the extra length storage tray of the optical terminal device concerning this invention is mounted | worn. It is the front perspective view and back perspective view which show the structure of the sleeve holding | maintenance part in the extra length storage tray of the optical terminal device concerning this invention. It is the perspective view and front view which show the structure of the other sleeve holding part in the surplus length storage tray of the optical terminal device concerning this invention. It is a perspective view which expands and shows the structure of a part of front surface of the optical terminal device concerning this invention. In the conventional optical terminal device, it is a perspective view which shows a structure when a cover part is removed. It is a perspective view which expands and shows the structure of a part of front surface of the conventional optical terminal device. It is a perspective view which expands and shows the other structure of a part of front surface of the conventional optical terminal device. It is a perspective view which expands and shows the structure of a part of extra length storage tray of the conventional optical terminal device.

The configuration of an optical terminal device according to an embodiment of the present invention is shown in FIGS. 1 is a perspective view showing the configuration of the optical terminal device 1 according to the present invention, and FIG. 2 is a perspective view showing the configuration of the optical terminal device 1 according to the present invention when the lid 3 is opened. These are perspective views which show the structure of the optical terminal device 1 concerning this invention when the cover part 3 is opened and the extra length storage tray 4 is removed.
As shown in these drawings, the optical terminal device 1 includes a housing that includes a main body 2 and a lid 3 that is pivotally supported by the main body 2 so as to be opened and closed. The main body 2 is formed by resin molding and has a rectangular box shape with an upper surface opened. The main body 2 is provided with four plates that rise substantially perpendicularly from each of the four edges of the bottom surface, thereby forming a box shape. 1 to 3, a front plate 2a and a first side plate 2b among four plates are shown. The height of the front plate 2a is formed higher than the height of the other three plates including the first side plate 2b. Three protruding cylindrical portions 2e are formed in the lower half of the front plate 2a, and coaxial terminals 51 are inserted into and protrude from each of the cylindrical portions 2e. Optical fiber introduction holes 2f, which are narrow grooves, are formed on the left and right sides of the upper half of the front plate 2a, respectively, and a pair of engagement protrusions 2c are formed between the two optical fiber introduction holes 2f. Yes. The engaging protrusion 2c is a flat protrusion having a horizontally long cross section, and a slope whose upper side is shorter than the lower side is formed at the tip. In addition, a slide portion 21 having a slide piece that can slide in the lateral direction is provided near one side of the front plate 2a, and a power cable 61 is led out from a cable insertion port provided in the slide portion 21. Furthermore, the mounting piece 2d is formed so as to protrude from the left and right sides of the lower end of the front plate 2a. By inserting a screw through the insertion hole formed in the mounting piece 2d and screwing it to the building wall or the like, The optical terminal device 1 can be installed on the wall of a building.

  The lid 3 is formed by resin molding and includes a rectangular upper surface plate 3a, and a first side surface plate 3b and a second side surface plate 3c which are formed upright from both sides of the upper surface plate 3a. An extending portion 3d extending forward is formed from the front side of the upper surface plate 3a, and a pair of engaging pieces 3e are erected at the tip of the extending portion 3d. A wedge-shaped protrusion is formed inside the tip of the engagement piece 3e. Moreover, the substantially rectangular holding piece 3f extended from the rear part of the lower edge of the 1st side plate 3b and the 2nd side plate 3c is formed, and the circular hole is formed in the holding piece 3f. Further, on both plates including the first side surface plate 2b of the main body portion 2, pivots having a circular cross section are formed at positions corresponding to the circular holes formed in the holding piece 3f in the lid portion 3. The lid 3 can be rotated with respect to the main body 2 so as to be openable and closable by inserting a circular hole formed in the holding piece 3f into the pivot. When the lid 3 is closed to the main body 2, the pair of engaging pieces 3e are engaged with the pair of engaging protrusions 2c, respectively. Further, in the state in which the lid 3 is closed to the main body 2, when an upward force is applied by applying a finger to the extending portion 3 d, the engagement of the engagement piece 3 e is released from the engagement protrusion 2 c and the lid 3. Will open, and the state shown in FIG. 2 can be obtained.

  An electronic circuit unit 5, a power supply unit 6, and a surplus length storage tray 4 are built in a housing composed of the main body 2 and the lid 3. The electronic circuit unit 5 is stored on the bottom surface on the front side of the main body 2, and the power supply unit 6 is stored on the bottom surface on the rear side of the main body 2. When the electronic circuit unit 5 is housed in the main body 2, the plurality of coaxial terminals 51 provided in the electronic circuit unit 5 are inserted through the cylindrical portion 2 e of the front plate 2 a and protrude. Further, when the power supply unit 6 is stored in the main body 2, the power cable 61 drawn from the power supply unit 6 is led out from the slide portion 21 of the front plate 2 a. The electronic circuit unit 5 has an optical connector 5a, and an optical connector provided at the tip of an optical fiber introduced into the optical terminal device 1 is attached to the optical connector 5a. The unit 5 is supplied. In the electronic circuit unit 5, the input optical signal is converted into an electric signal and output from the coaxial terminal 51. The power supply unit 6 supplies power for operation to the electronic circuit unit 5.

  A surplus length storage tray 4 is stored so as to overlap the electronic circuit unit 5 and the power supply unit 6 stored in the main body 2. A locking portion 49a, which will be described later, is formed so as to protrude forward from the front side wall of the extra-length storage tray 4, and a rectangular locking recess 49b is formed on the rear side wall. When the extra length storage tray 4 is placed on the electronic circuit unit 5 and the power supply unit 6, it is locked to a locking projection (not shown) formed on the inner surface of the front plate 2a of the main body 2 of the locking portion 49a. Let it be placed. As a result, the support piece 2g formed so as to protrude upward from the rear plate of the main body 2 is locked by the locking recess 49b, and the extra length is stored on the electronic circuit unit 5 and the power supply unit 6 of the main body 2. A tray 4 is attached.

The structure of the extra length storage tray 4 is shown in FIGS. FIG. 4 is a perspective view showing the configuration of the extra length storage tray 4, and FIG. 5 is a top view showing the configuration of the extra length storage tray 4.
The surplus length storage tray 4 is formed by resin molding and has a rectangular box shape with an upper surface opened as shown in these drawings. The extra-length storage tray 4 is composed of four sheets of a first side wall 4b, a second side wall 4c, a third side wall 4d, and a fourth side wall 4e that stand up substantially at right angles from the respective edges of the four sides of the rectangular bottom surface part 4a. A wall portion is provided, thereby forming a box shape with an upper surface opened. The extra length storage tray 4 is provided to store the extra length of the optical fiber introduced into the optical terminal device 1 according to the present invention, and the extra length storage tray 4 is used to wind and store the optical fiber inside. The plurality of guide portions are formed in a wall-like manner from the bottom surface portion 4a.

  On both sides of the second side wall 4c, which is the front surface of the extra length storage tray 4, introduction grooves 45c are formed as narrow grooves into which optical fibers are introduced. The introduction groove 45c overlaps the optical fiber introduction hole 2f formed in the front plate 2a of the optical terminal device 1, and the optical fiber introduced into the optical terminal device 1 from the optical fiber introduction hole 2f passes through the introduction groove 45c. The extra length storage tray 4 is introduced. The introduced optical fiber is sandwiched and held by the sandwiching portion 45 formed after the introduction hole 45c. The sandwiching portion 45 includes a sandwiching groove 45e in which a plurality of rows of protrusions having tapered ends are opposed to each other, and a sandwiching piece 45a that covers the sandwiching groove 45e. The piece 45a is freely opened and closed on the clamping groove 45e by a hinge part 45d, and a locking piece 45b is formed outside the clamping piece 45a. The locking piece 45b is formed in a V shape and has elasticity, and is inserted into the clamping groove 45e when the clamping piece 45a is bent at the hinge portion 45d and placed on the clamping groove 45e. The optical fiber is clamped so as not to come out of the clamping part 45. At this time, the locking piece 45b is elastically locked to the locking hole 45f, which is a rectangular hole, so that the sandwiching piece 45a is kept closed.

  An optical connector is provided at the tip of the optical fiber introduced into the extra length storage tray 4, and this optical connector is attached to the optical connector 5 a in the electronic circuit unit 5. In this case, the extra length of the optical fiber is wound around and stored in a guide portion that is formed in a wall shape from the bottom surface portion 4a. In this guide portion, a first guide portion 41a having a crescent shape with one surface being convex and the other surface being concave is formed at the back of the bottom surface portion 4a, on the front side of the first guide portion 41a. An elliptical second guide portion 41b having both convex surfaces adjacent to each other is formed. In addition, an elliptical third guide portion 41c that is substantially the same shape as the second guide portion 41b is formed adjacent to the front side of the second guide portion 41b, and adjacent to the front side of the third guide portion 41c. A fourth guide portion 41d having a crescent-like shape that is vertically inverted with the same shape as the first guide portion 41a is formed.

  The first guide portion 41a to the fourth guide portion 41d are formed side by side so that the central axes overlap from the back of the bottom surface portion 4a, and the convex shape of the second guide portion 41b is formed in the concave portion of the first guide portion 41a. Since the convex and concave curvatures are substantially equal to each other, an arc-shaped groove having a substantially constant width is formed between the two. In addition, the concave curved surface portion of the fourth guide portion 41d faces the convex curved surface portion of the third guide portion 41c, and the convex and concave curvatures are substantially equal. A circular arc-shaped groove having a substantially constant width is formed. Further, an arcuate outer guide portion 46a and an outer guide portion 46b are formed on the outer side of the convex portion of the first guide portion 41a so as to face each other. The convex portion and the outer guide portions 46a, 46b Since the curvatures are substantially equal, an arc-shaped groove having a substantially constant width is formed between the two. Furthermore, an outer guide portion 46c having a shape in which an arc shape is added to a linear tip is formed to face from the left side of the third guide portion 41c to the outer side of the convex curved portion of the fourth guide portion 41d. Since the curvature of the convex portion and the outer guide portion 46c are substantially equal, an arc-shaped groove having a substantially constant width is formed between them. The outer guide portion 46b is formed so as to overlap the first side wall 4b, the fourth side wall 4e, and the third side wall 4d except for the corners thereof. An outer guide portion 46b is formed inside 4b, the fourth side wall 4e, and the third side wall 4d. An arcuate outer guide portion 46d is formed outside the outer guide portion 46a, and a short outer guide portion 46e is formed between the outer guide portion 46a and the outer guide portion 46c. The outer guide portion 46e is formed on the third side wall 4d side that is slightly inside the line connecting the outer guide portion 46a and the outer guide portion 46c.

  The extra length of the optical fiber introduced into the optical terminal device 1 is wound and accommodated in the groove having the substantially constant width as described above. However, when the optical fiber is wound, the winding diameter is wound. Is urged in the direction of spreading. As described above, when the optical fiber is biased in the direction in which the winding diameter increases, the optical fiber may get over the first guide portion 41a to the fourth guide portion 41d and the outer guide portions 46a to 46d, and maintenance or the like may occur. The workability may deteriorate, the appearance may deteriorate, and the transmission characteristics may deteriorate in the worst case. In order to prevent this, a plurality of pressing claws are formed at predetermined intervals at the upper edge and the middle position of each guide portion so that the width becomes narrower toward the tip and protrudes in an eaves shape. Yes. The presser claw formed on the guide portion has a height between an upper presser claw 42a formed on the upper edge of the guide portion and a lower presser claw 42b formed at a height approximately in the middle of the guide portion. It is formed in two different stages. The upper presser claw 42a and the lower presser claw 42b are formed in the guide portion at a predetermined interval with a length close to the guide portion facing the tip substantially parallel to the surface of the bottom surface portion 4a. As it goes, the width of both sides becomes narrower and it is formed to project in an eaves shape. In FIG. 5, only the lower presser claw 42 b is hatched, but the upper presser claw 42 a and the lower presser claw 42 b are formed in the guide portion almost alternately.

As described above, the upper guide claw 42a and the lower press claw 42b are provided in the first guide portion 41a to the fourth guide portion 41d and the external guide portions 46a to 46d, so that the extra length of the optical fiber introduced into the optical terminal device 1 is increased. Can be stored in two steps between the lower presser claw 42b and the bottom surface portion 4a and between the upper presser claw 42a and the lower presser claw 42b. For this reason, for example, when the front and back of the sleeve (or mechanical splice) that protects the fused portion connecting the optical fiber are stored separately in the upper and lower stages, or when there are two signal systems such as a video system and a communication system, The two can be stored separately in the upper and lower stages, and the extra length of the optical fiber can be stored while organizing.
If the extra length of the optical fiber does not need to be stored separately, there is no need to be aware of the upper and lower stages, but if you want to improve the storage workability, use the upper stage that is easy to store, and the extra length of the stored optical fiber will pop out. If you want to prevent this reliably, you can use it in different ways, such as using the lower tier.

  The configuration of the upper presser claw 42a formed on the upper edge of the outer guide portion 46b facing the first guide portion 41a is enlarged and shown in FIG. 9A, and cut along the line AA in FIG. 9A. A cross-sectional view is shown in FIG. As shown in these figures, the rounded tip of the upper presser claw 42a formed so as to be bent at a substantially right angle from the upper edge of the outer guide portion 46b and projecting in an eave shape is the first guide facing the first guide. A concave portion 48a is formed in the first guide portion 41a that is close to the portion 41a at a distance d1 and faces the tip of the upper presser claw 42a. The depth of the recess 48a is d2, and the width of the recess 48a is 2 to 4 times the width of the tip immediately before the upper presser claw 42a is rounded. Further, a lower presser claw 42b formed substantially orthogonal to the middle of the outer guide part 46b is shown in FIG. 9 (a), but the tip of the lower presser claw 42b is spaced from the first guide part 41a facing it. A concave portion 48b is formed in the first guide portion 41a that is close at d1 and faces the tip of the lower presser claw 42b. The depth of the concave portion 48b is deeper than the concave portion 48a and is d3, and the width of the concave portion 48b is 2 to 4 times the width of the tip portion just before rounding the lower presser claw 42b. As an example of the dimensions, the distance d1 is about 2 mm, the depth d2 is about 0.5 mm below the lower surface of the upper presser claw 42a, and the depth d3 is about from the lower surface of the lower presser claw 42b. The depth is about 0.5 mm below.

  Here, in order to explain the operation of the recess 48a and the recess 48b, the configuration of the extra length storage tray 4 when the recess 48a and the recess 48b are not provided is shown in FIGS. 10A and 10B. FIG. 10A shows an enlarged configuration of the upper presser claw 42a formed on the upper edge of the outer guide portion 46b facing the first guide portion 41a when the concave portion 48a and the concave portion 48b are not provided. FIG. 10B is a sectional view taken along line BB in FIG. As shown in these figures, the rounded tip of the upper presser claw 42a formed so as to be bent at a substantially right angle from the upper edge of the outer guide portion 46b and projecting in an eave shape is the first guide facing the first guide. It is close to the part 41a with a distance d1. Further, FIG. 10 (a) shows a lower presser claw 42b formed substantially orthogonal to the middle of the outer guide part 46b, but the tip of the lower presser claw 42b is spaced from the first guide part 41a facing it. It is close at d1. The interval d1 is set to, for example, about 2 mm as described above.

As described above, when the lengths of the upper-stage presser claw 42a and the lower-stage presser claw 42b are lengthened and approached to the first guide part 41a to the fourth guide part 41d facing each other, the passage between the two is narrowed. The effect | action which prevents popping out can be show | played. However, since the passage is narrow, it becomes difficult to store the optical fiber in the upper pressing claw 42a or the lower pressing claw 42b. Therefore, in the extra length storage tray 4 in the optical terminal device 1 of the present invention, as shown in FIG. 9, the upper presser claw 42a is placed on the first guide part 41a to the fourth guide part 41d facing the tip of the upper presser pawl 42a. A recess 48a lower than the lower surface of the lower presser claw 42b is formed in the first guide portion 41a to the fourth guide portion 41d facing the tip of the lower presser claw 42b.
That is, even if the length of the upper presser claw 42a and the lower presser claw 42b is increased and the path for storing the optical fiber is narrowed, the first guide portions 41a to 41a facing the upper presser claw 42a or the lower presser claw 42b. Since the concave portion 48a or the concave portion 48b that is lower than the lower surface of the upper-stage presser claw 42a or the lower-stage presser claw 42b is formed in the 4 guide portion 41d, the optical fiber can be connected to the upper-stage presser claw 42a or the lower-stage presser claw 42b obliquely from above. Workability is improved because it can be placed inside. In addition, since the concave portion 48a or the concave portion 48b is formed, a finger or a tool enters the concave portion 48a or the concave portion 48b, so that the workability for storing the optical fiber is further improved.

  As shown in FIGS. 4 and 5, the first guide portion 41a to the fourth guide portion 41d and the outer guide portions 46a to 46d are formed on the extra-length storage tray 4 so that two non-intersecting cylindrical shapes are formed. A winding part and the cylindrical winding part which the two winding parts cross | intersect are comprised. This mode is shown in FIG. 6, and as shown in FIG. 6, a cylindrical first winding portion 8a formed by the outer periphery of the first guide portion 41a and the second guide portion 41b, and a third guide portion 41c. And the fourth guide portion 41d formed by the outer periphery combined with the first winding portion 8a and the cylindrical third winding portion 8c, and the second guide portion 41b and the third guide portion 41c combined with the outer periphery. A cylindrical second winding portion 8b intersecting with the formed first winding portion 8a and second winding portion 8b is configured. In this case, the radius of the 1st volume part 8a, the 2nd volume part 8b, and the 3rd volume part 8c is more than the minimum bending radius which can use an optical fiber.

  Thereby, as shown in FIG.6 (b), an optical fiber can be wound and accommodated in two parts, the 1st volume part 8a and the 3rd volume part 8c. For example, when there are two signal systems such as a video system and a communication system before and after the optical fiber connection part, the signal systems can be stored separately. Further, when the extra length of the optical fiber is not long, it may be wound and stored only in the first winding part 8a or only in the third winding part 8c. Further, when the extra length of the optical fiber is not long but not short, as shown in FIG. 7A, a track-shaped fourth winding portion 8d in which the first winding portion 8a and the second winding portion 8b are combined, or Alternatively, the second winding portion 8a and the third winding portion 8c may be wound and stored in a track-like fifth winding portion 8e. Furthermore, when the extra length of the optical fiber is long, as shown in FIG. 7B, a long track-shaped sixth winding portion 8f in which the first winding portion 8a, the second winding portion 8b, and the third winding portion 8c are combined. It may be wound around and stored. Furthermore, there is a case where it is desired to change the winding direction of the optical fiber stored in the extra length storage tray 4. In this case, as shown in FIG. 8, the optical fiber wound around the first winding portion 8a or the third winding portion 8c. The winding direction can be changed by a seventh winding portion 8g that is wound around the third winding portion 8c or the first winding portion 8a through the center of the second winding portion 8b. Thus, the winding direction can be changed by winding the optical fiber in the shape of figure 8 like the seventh winding portion 8g in the extra length storage tray 4. In any of the above-described modes of winding the optical fiber, the radius of the winding portion is equal to or greater than the minimum bending radius of the optical fiber so that the minimum bending radius of the optical fiber can be secured.

Next, a configuration in which the sheet 47 is mounted on the extra length storage tray 4 is shown in FIGS. FIG. 11A is a perspective view showing a configuration in which a sheet is mounted on the extra-length storage tray, and FIG. 11B is a top view thereof. Further, a part of the extra length storage tray 4 is enlarged to show the configuration of the sheet pressing claw 42c in FIG. 12A, and the state in which the sheet 47 is attached to the sheet pressing claw 42c is enlarged to FIG. 12B. Shown in
As shown in FIG. 12A, the sheet pressing claw 42c is formed on the upper pressing claw 42a with a gap 42d, which is a slight gap. The sheet pressing claws 42c are respectively formed on the six upper pressing claws 42a formed in the outer guide portions 46a, 46b, 46c. The central sheet pressing claw 42e is formed with a gap 42d on an upper pressing claw 42a (not shown) formed in the third guide portion 41c. The center sheet pressing claw 42e is formed at a position substantially at the center of the portion of the extra length storage tray 4 where the optical fiber can be stored. The sheet pressing claw 42c and the center sheet pressing claw 42e have a shape that is considerably smaller than the upper pressing claw 42a, and the widths on both sides are narrower toward the tip. The edges of the resin sheet 47 and the like are inserted into the gap 42d between the sheet pressing claw 42c and the central sheet pressing claw 42e and the upper pressing claw 42a, and FIGS. As shown, the sheet 47 is mounted so as to cover the upper surface of each guide portion in which the optical fiber of the extra-length storage tray 4 is stored. The dimension of the gap 42d is substantially the same as the thickness of the sheet 47.

FIG. 13A is a top view showing the configuration of the sheet 47, and FIG. 13B is a perspective view thereof. The sheet 47 is a thin resin sheet. As shown in these drawings, the upper portion 47b and the lower portion 47c are rounded, and the central portion 47a between the upper portion 47b and the lower portion 47c is formed. Cutouts 47d are formed on both sides to make the width slightly narrower. A rectangular cutout 47e is formed slightly below the center of the central portion 47a in correspondence with the position of the central sheet pressing claw 42e.
When the central sheet pressing claw 42e is inserted into the cutout portion 47e of the sheet 47 and the sheet 47 is moved slightly in the direction of the second side wall 4c, the cutout portion is formed in the gap 42d between the central sheet pressing claw 42e and the upper pressing claw 42a. The edge part of 47e is clamped. Next, the periphery of the sheet 47 is inserted into the gaps 42d between the six sheet pressing claws 42c and the upper pressing claws 42a. As a result, the sheet 47 can be mounted so as to cover the upper portion of the extra-length storage tray 4 and prevent the sheet 47 from floating or falling off.

Thereby, the function which prevents the optical fiber accommodated in the extra length storage tray 4 from jumping out can be made more reliable. Further, by installing the sheet pressing claw 42c and the center sheet pressing claw 42e for pressing the sheet 47 on the upper pressing claw 42a for pressing the optical fiber, the space can be saved and the structure for mounting the sheet 47 is simplified. Increase in mold cost can be suppressed.
The notches 47d formed on both sides of the central portion 47a of the sheet 47 hold a sleeve that is a connecting portion between optical fibers provided in the extra length storage tray 4 and a cylindrical connecting portion that is a mechanical splice. This corresponds to the position where the portion 43 and the sleeve holding portion 44 are formed.

  The sleeve is attached to the fused portion so as to protect the fused portion when the optical fibers are connected by fusing the end faces of the optical fibers. The mechanical splice connects the optical fibers by aligning and fixing the end faces of the optical fibers. Such a cylindrical connection part, which is a sleeve or a mechanical splice, is stored in the extra-length storage tray 4 together with the extra length of the optical fiber. The cylindrical connection part has an elongated cylindrical shape with a diameter larger than that of the optical fiber. Since it is heavier than an optical fiber and cannot be bent, the optical fiber may be bent and damaged when it is moved unless it is held so as not to move. For this reason, it is held so as not to move in the extra length storage tray 4. In the optical terminal device 1 according to the present invention, a sleeve holding portion 43 and a sleeve holding portion 44 for holding a cylindrical connecting portion that is a sleeve or a mechanical splice are provided.

  As shown in FIG. 5, the sleeve holding portion 44 is formed on a surface facing the third side wall 4d of the outer guide portion 46e. The configuration of the sleeve holding portion 44 is enlarged and shown in FIGS. 14 (a) and 14 (b). Show. FIG. 14A is a rear perspective view showing the configuration of the sleeve holding portion 44, and FIG. 14B is a front perspective view showing the configuration of the sleeve holding portion 44. As shown in these drawings, the sleeve holding portion 44 is formed on one surface of the outer guide portion 46e, and includes a plate-like sleeve holding piece 44a, a support portion 44b, and an engaging claw 44c. The sleeve holding piece 44a has a flat plate shape at the center, and is formed into a flat plate shape that is bent obliquely so that the distance from the outer guide portion 46e becomes narrower as both sides of the center portion approach the tip. The support portion 44b extends from the lower edge of the central portion of the sleeve holding piece 44a and is connected to one surface of the outer guide portion 46e, and is formed so as to float the sleeve holding piece 44a from the bottom surface portion 4a. The engaging claw 44c is formed at the substantially same height as the upper edge of the central portion of the sleeve holding piece 44a and protrudes from the upper portion of one surface of the outer guide portion 46e. An upper presser claw 42a is formed at the upper edge of the other surface of the outer guide portion 46e and projecting in an eave shape substantially parallel to the bottom surface portion 4a so as to face the engaging claw 44c. The sleeve holding piece 44a is formed so as to float from the bottom surface portion 4a so that the sleeve or mechanical splice held by the sleeve holding portion 44 is positioned above the outer guide portion 46e, and the support portion 44b and the bottom surface portion 4a. A plurality of optical fibers can be accommodated in the gap formed between the two. When the sleeve or mechanical splice is held by the sleeve holding portion 43, the sleeve or mechanical splice is inserted between the sleeve holding piece 43a and the outer guide portion 46e. Accordingly, the sleeve or the mechanical splice is elastically pressure-bonded and held on one surface of the outer guide portion 46e by the action of the bent portions on both sides of the sleeve holding piece 44a.

  Here, as shown in FIGS. 6A and 7A, when the extra length of the optical fiber is wound around the second winding portion 8b, and the track-like fourth winding portion 8d or fifth winding portion 8e. When the extra length of the optical fiber is wound around, the optical fiber is wound inside the outer guide portion 46e. In this case, the optical fiber is accommodated in the gap between the support portion 44b and the bottom surface portion 4a of the sleeve holding portion 44, and the support portion 44b prevents the optical fiber from getting over the outer guide portion 46e. In addition, when the extra length of the optical fiber is wound around the large track-shaped sixth winding portion 8f as shown in FIG. 7B, it can be wound inside or outside the outer guide portion 46e. When wound inside the outer guide portion 46e, the optical fiber does not get over the outer guide portion 46e by the support portion 44b as described above, and when wound outside the outer guide portion 46e, the outer guide portion The upper-stage pressing claw 42a formed on 46e prevents the optical fiber from getting over the outer guide portion 46e.

  Next, the configuration of the sleeve holding portion 43 is enlarged and shown in FIGS. FIG. 15A is a front perspective view showing the configuration of the sleeve holding portion 43, and FIG. 15B is a front view showing the configuration of the sleeve holding portion 43. As shown in these drawings, the sleeve holding portion 43 is formed in two steps so as to face the inner surface of the third side wall 4d functioning as the outer guide portion 46b, and there is a step between the support portion 43c and the support portion 43c. The first sleeve holding piece 43a and the second sleeve holding piece 43b are formed in two front and rear stages, and the first engagement claw 43d and the second engagement claw 43e. The support portion 43c is located at a predetermined height from the bottom surface portion 4a, and is extended from the lower edge of the central portion of the first sleeve holding piece 43a and the second sleeve holding piece 43b to be connected to the third side wall 4d (outer guide portion 46b). ) Is connected to the inner surface. The first sleeve holding piece 43a and the second sleeve holding piece 43b have a flat plate at the center, and are inclined so that the distance from the third side wall 4d (outer guide portion 46b) becomes narrower as both sides of the center go to the tip. It is formed into a bent flat plate shape. The second sleeve holding piece 43b is disposed at a position lower than the first sleeve holding piece 43a and on the side far from the third side wall 4d (outer guide portion 46b). The first engagement claw 43d is formed at the substantially same height as the upper edge of the central portion of the first sleeve holding piece 43a, and is formed to protrude from the upper part of the inner surface of the outer guide portion 46e. Is located at substantially the same height as the upper edge of the central portion of the second sleeve holding piece 43b, and is formed so as to protrude from the surface of the central portion of the first sleeve holding piece 43a facing each other.

  15A and 15B, a sleeve 72a that protects the fused portion between the end faces of the optical fiber 71a and a sleeve 72b that protects the fused portion between the end faces of the optical fiber 71b are mounted on the sleeve holding portion 43, respectively. ing. In this case, due to the action of the bent portions on both sides of the first sleeve holding piece 43a, the sleeve 72a is elastically pressed and held on the inner surface of the upper portion of the third side wall 4d (outer guide portion 46b). Further, the sleeve 72b is elastically pressure-bonded and held on the outer surface of the central portion of the first sleeve holding piece 43a by the action of the bent portions on both sides of the second sleeve holding piece 43b. In this case, the first sleeve holding piece 43a is formed so as to float from the bottom surface portion 4a so that the sleeve 72a is positioned and held above the third side wall 4d (outer guide portion 46b), and the sleeve 72b is formed in the sleeve 72a. The second sleeve holding piece 43b is formed to float from the bottom surface portion 4a so as to be held at a slightly lower position. Even in this case, a plurality of optical fibers can be accommodated in the gap formed between the support portion 43c and the bottom surface portion 4a. In FIGS. 15A and 15B, the sleeves 72a and 72b are held by the sleeve holding portion 43. However, when the optical fibers are connected by a mechanical splice, the sleeves 72a and 72b are mechanically similar to the sleeves 72a and 72b. The splice can be held by the sleeve holding portion 43. Further, the sleeve or the mechanical splice can be held in the sleeve holding portion 44 in the same manner as the sleeve or the mechanical splice is held in the sleeve holding portion 43.

  As described above, since the sleeve holding portion 43 and the sleeve holding portion 44 are configured, when there are two signal systems such as a video system and a communication system, they are a sleeve or a mechanical splice that is a connection part between optical fibers. By changing the height of the holding position of the cylindrical connecting portion, it is easy to store one on the bottom surface portion 4a side of the extra length storage tray 4 and store the other on the upper surface side of the extra length storage tray 4. Thus, the extra length of the optical fiber can be arranged and stored. Further, since the holding positions of the sleeves 72a and 72b or the mechanical splice are high, it is possible to avoid the sleeves 72a and 72b or the mechanical splice becoming an obstacle when the extra length of the optical fiber is stored. .

  By the way, in the optical terminal device 1 according to the present invention, the power supply unit 6 is built in the casing composed of the main body 2 and the lid 3, and the power supply unit 6 is detachably stored in the main body 2. ing. When the outlet for supplying power to the power supply unit 6 is in the vicinity of the place where the optical terminal device 1 is installed, the power supply unit 6 is housed in the housing of the optical terminal device 1, but the outlet is the optical terminal device 1. If the power supply unit 6 is not near the installation location, the power supply unit 6 is taken out from the optical terminal device 1 and installed near the outlet. In this case, the power supply unit 6 is provided with a coaxial terminal. By connecting the coaxial terminal and the coaxial terminal 51 of the optical terminal device 1 with a coaxial cable, the optical terminal device is connected to the optical terminal device via the coaxial cable. 1 is supplied with power and the electronic circuit unit 5 becomes operable. An electrical signal obtained by converting the optical signal is sent from the optical terminal device 1 via the coaxial cable. The electrical signal is output from another coaxial terminal provided in the power supply unit 6 and supplied to a predetermined electronic device. become able to.

Here, when the power supply unit 6 is housed in the housing of the optical terminal device 1, the configuration in which the power cable 61 drawn from the power supply unit 6 is drawn from the front plate 2a of the main body 2 is enlarged. Shown in a). Although not shown in this figure, the power cable 61 is drawn out from the cable insertion port 21 a of the slide portion 21. Next, when the power supply unit 6 is taken out from the housing of the optical terminal device 1, the configuration in which the power cable 61 drawn from the power supply unit 6 is removed from the housing is enlarged and shown in FIG. As shown in this figure, the cable insertion port 21a, which is a passage of the power cable 61 provided in the front plate 2a of the main body 2 from which the power cable 61 has been led out, becomes empty. Then, since rainwater or the like may enter the optical terminal device 1 from the cable insertion port 21a and cause trouble, the slide piece 21b is slid sideways in the slide portion 21 to change the cable insertion port 21a to the position shown in FIG. c) As shown in FIG.
In this way, waterproofing of the cable insertion port 21a, which is the passage of the power cable 61, is performed by sliding the slide piece 21b, so that the work for waterproofing becomes easy. Therefore, there is no need to perform the work of removing and fitting the waterproof cap as in the conventional case, so that the risk of losing the waterproof cap can be eliminated, and the cost can be reduced because the waterproof cap is no longer necessary. Can do. The cable insertion port 21a has a groove and is open on one side, and a power cable 61 with a plug attached to the tip is inserted through this opening. This opening is closed by the second side face plate 3 c of the lid 3 when the lid 3 is closed to the main body 2.

The optical terminal apparatus according to the present invention is limited to an apparatus that converts an optical signal transmitted through an optical fiber into an optical-electrical signal and demodulates it, and supplies the demodulated CATV signal to a set-top box or a coaxial CATV line. Rather, it includes all electronic devices into which optical fibers are introduced.
In the optical terminal device according to the present invention described above, one optical fiber introduction hole for introducing an optical fiber is provided on each of the left and right. However, the present invention is not limited to this, and two or more optical fiber introduction holes are provided on the left and right. A plurality of optical fibers may be introduced into the optical terminal device from the left and right optical fiber introduction holes. Further, the extra length of the optical fiber introduced into the optical terminal device may be stored by an extra length storage tray, and the optical fiber may be led out from another optical fiber introduction hole. In this case, the optical terminal device also functions as an extra length storage device that stores the extra length of the optical fiber.
Further, in the above-described extra length storage tray according to the optical terminal device of the present invention, the presser claws having different heights are formed in two stages on the plurality of guide portions for winding the extra length of the optical fiber. However, the present invention is not limited to this, and three or more stages of pressing claws having different heights may be formed on the plurality of guide portions.
Further, one of the sleeve holding portions according to the optical terminal device of the present invention described above is formed in two stages with different heights of the sleeve holding pieces, so that the cylindrical connection portion which is a sleeve or a mechanical splice is raised. Although it can hold | maintain at the lower stage, it is not restricted to this, The height of a sleeve holding piece may be varied and it may form 3 steps | paragraphs or more so that a cylindrical connection part can be hold | maintained 3 steps | paragraphs or more. Further, instead of providing two sleeve holding portions in the extra length storage tray, only one sleeve holding portion having sleeve holding pieces having different heights may be provided.
Furthermore, the front plate of the main body according to the optical terminal device of the present invention described above is provided with a coaxial terminal, an optical fiber introduction hole, and a slide portion from which the power cable of the power supply unit is drawn. In particular, the introduction and extraction of optical fiber lines and cables are concentrated. However, the present invention is not limited to this, and the rear plate or side plate of the main body may be provided with a coaxial terminal, an optical fiber introduction hole, and a slide portion from which a power cable is drawn.

DESCRIPTION OF SYMBOLS 1 Optical terminal device, 2 Main-body part, 2a Front plate, 2b Side plate, 2c Engagement protrusion, 2d Mounting piece, 2e Cylindrical part, 2f Optical fiber introduction hole, 2g Support piece, 3 Lid part, 3a Top plate, 3b 1st side plate, 3c 2nd side plate, 3d extension part, 3e engagement piece, 3f holding piece, 4 extra length storage tray, 4a bottom part, 4b 1st side wall, 4c 2nd side wall, 4d 3rd side wall, 4e 4th side wall, 5 Electronic circuit unit, 5a Optical connector, 6 Power supply unit, 8a 1st volume, 8b 2nd volume, 8c 3rd volume, 8d 4th volume, 8e 5th volume, 8f 6th Winding portion, 21 slide portion, 21a cable insertion port, 21b slide piece, 41a first guide portion, 41b second guide portion, 41c third guide portion, 41d fourth guide portion, 42a upper presser claw, 42b lower presser claw, 4 c Sheet pressing claw, 42d gap, 42e Center sheet pressing claw, 43 sleeve holding portion, 43a first sleeve holding piece, 43b second sleeve holding piece, 43c support portion, 43d first engagement claw, 43e second engagement claw , 44 Sleeve holding part, 44a Sleeve holding piece, 44b Support part, 44c Engaging claw, 45 Clamping part, 45a Clamping piece, 45b Locking piece, 45c Introducing groove, 45d Hinge part, 45e Clamping groove, 46a Outside Guide part, 46b Outer guide part, 46c Outer guide part, 46d Outer guide part, 46e Outer guide part, 47 Seat, 47a Center part, 47b Upper part, 47c Lower part, 47d Notch, 47e Cutout part, 48a Concave part, 48b Concave part, 49a Locking part, 49b Locking recess, 51 Coaxial terminal, 61 Power cable, 71a Optical fiber 71b optical fiber, 72a sleeve, 72b sleeve, 100 optical terminal device, 102 main body, 102a optical fiber introduction hole, 102b mounting piece, 102c engaging protrusion, 102d pivot, 103 lid, 103b extending portion, 103c engaging piece, 104 surplus Long storage tray, 104a side wall, 121 waterproof cap, 121a head, 121b foot, 141 guide wall, 142 holding claw, 144 sleeve holding part, 145 clamping part, 147 clamping part, 151 coaxial terminal, 160 cable insertion hole, 161 Power cable

Claims (4)

An electronic circuit unit that converts an optical signal transmitted by an optical fiber into an electrical signal and outputs the electrical signal;
A power supply unit for supplying power to the electronic circuit unit;
An extra-length storage tray that is disposed on the electronic circuit unit and the power supply unit and stores the extra length of the introduced optical fiber;
A main body that stores the electronic circuit unit, the power supply unit, and the extra-length storage tray; and a housing that includes a lid that is fixed to the main body so as to be openable and closable.
A plurality of guide portions that can be accommodated by winding the surplus length of the optical fiber are formed upright from the bottom surface of the surplus length storage tray, and the optical fiber that is accommodated in the plurality of guide portions protrudes. The optical terminal device is characterized in that a plurality of pressing claws are formed on the guide portion at different heights, and the pressing claws are formed in an eave shape substantially parallel to the bottom surface portion.   2. The presser pawl is composed of two stages of an upper presser claw formed at the upper end of the guide part and a lower presser claw formed at a height substantially in the middle of the guide part. The optical terminal device described.   The optical terminal device according to claim 2, wherein the upper-stage presser claw and the lower-stage presser claw are formed alternately in the guide portion.   The plurality of guide portions have a first crescent-shaped shape in which one surface is convex and the other surface is concave, and both surfaces are convex adjacent to the first guide portion. 2. A combination of an elliptical second guide portion and an outer guide portion formed outside the first guide portion and the second guide portion. 4. The optical terminal device according to any one of 3 to 3.

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