JP2005189438A - Optical terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely hold a mounting device such as a protective sleeve and a mechanical splice in a housing. <P>SOLUTION: A holding part 46 for holding the mounting device 47 such as the protective sleeve and the mechanical splice mounted on an introduced optical cable 4a is formed in a tray part 6 stored in the housing. The holding part 46 is composed of a flat plate-like wall part and an arc-shaped holding piece opposed to the wall part. The lower part of a substantially center part of the holding piece is elastically supported on the tray part 6. The mounting device 47 is held to be pushed with the arc-shaped holding piece by sufficient pushing force. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical terminal device in which an electronic circuit unit for converting an optical signal into an electrical signal and a power source unit are incorporated in a housing.

  In recent years, with the spread of high-speed and high-bandwidth 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, an optical terminal device for amplifying an optical signal from an optical cable by converting the optical signal into an electrical signal and supplying the amplified frequency multiplexed signal to a set top box or a coaxial CATV line is required. Become. Within the optical terminal device casing, there are an extra length storage unit for storing the extra length of the introduced optical cable, and an optical receiving unit for converting the optical signal from the introduced optical cable into an electrical signal, amplifying it, and outputting it. Is provided. 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.

  In such an optical terminal device, an optical cable is introduced in order to input an optical signal, and this optical cable is led to an optical receiving unit. In this case, the optical fibers in the optical cable may be connected in the casing of the optical terminal device. When the connection between the optical fibers is performed by fusing the end faces of the optical fibers, a protective sleeve for protecting the fused part is attached to the fused part. Further, the optical fiber can be connected by a mechanical splice that aligns and fixes the end face of the optical fiber. A protective sleeve for protecting the optical filter is attached to the optical filter inserted into the optical fiber. Such a protective sleeve and mechanical splice are housed in the housing together with the extra length of the optical cable. Protective sleeves and mechanical splices are thicker and longer than optical cables and are heavier than optical cables, so optical cables can be bent and damaged when they are moved so that they do not move in the housing. There was a problem that occurred.

  Therefore, an object of the present invention is to provide an optical terminal device that can securely hold a mounting device such as a protective sleeve or a mechanical splice in a housing.

  In order to achieve the above object, in the optical terminal device of the present invention, a holding portion for holding a mounting device such as a protective sleeve or a mechanical splice is composed of a wall portion and a holding piece facing the wall portion. The most important feature is that when the mounting device is disposed between the pieces, the mounting device is elastically pressed and held by the wall portion by the holding piece.

  According to the present invention, the holding portion for holding the mounting device such as the protective sleeve or the mechanical splice is configured by the wall portion and the holding piece facing the wall portion, and the mounting device is disposed between the wall portion and the holding piece. In addition, since the mounting device is elastically pressed and held by the wall portion by the holding piece, the mounting device can be securely held in the housing. In addition, when the holding piece is formed in an arcuate shape or the holding piece is formed so that the distance between the surface of the holding piece and the wall portion becomes lower, the holding force of the holding portion can be further improved. Further, a bent piece that bends toward the wall portion may be formed at both ends of the holding piece, or the holding piece may be formed so that the width gradually decreases from the central portion toward the bent piece.

  For the purpose of securely holding a mounting device such as a protective sleeve or mechanical splice in the housing, the holding portion for holding the mounting device is composed of a wall portion and a holding piece facing the wall portion. This was realized by holding the mounting device elastically pressed against the wall portion by the holding piece when the mounting device was disposed between them.

FIG. 1 is a perspective view showing the configuration of an embodiment of the optical terminal device according to the present invention, and FIG. 2 is a side view showing the configuration of the optical terminal device in FIG.
The housing of the optical terminal device 1 according to the present invention shown in these drawings is composed of a box-shaped main body 2 and a lid 3 fixed to the main body 2 so as to be freely opened and closed. The main body 2 and the lid 3 which are cases are formed by molding a resin, and a pair of holding pieces 21 formed on both sides of the upper portion of the lid 3 are formed on the main body 2, which will be described later. The lid portion 3 is fixed to the main body portion 2 so as to be openable and closable. When the lid 3 is closed with respect to the main body 2, a plurality of screws are screwed onto the main body 2 from the lid 3 to form a rainproof casing. In this case, the lower edge of the opposing side surface portion in the lid portion 3 is fitted into the edge portion of the opposing side surface portion of the main body portion 2. As shown in FIG. 2, the main body 2 includes an electronic circuit unit 31 and a power supply unit 32 that supplies power to the electronic circuit unit 31. The electronic circuit unit 31 and the power supply unit 32 are attached to a metal chassis 30 and housed in the main body 2. As shown in FIG. 2, the rear surface of the chassis 30 and the main body 2 are disposed so as to face each other with a predetermined distance therebetween to form a passage.

  A resin-molded tray section 6 is disposed on the electronic circuit unit 31 and the power supply unit 32 built in the main body section 2. The tray portion 6 is formed with an optical cable 4a introduced into the optical terminal device 1, an introduction portion of the optical cable 4b, and an extra length storage portion. The reason for providing the extra length storage portion for storing the extra length portion of the optical cable is as follows. By providing an extra length portion that provides a margin for the optical cable length, it is possible to cope with a connection change or the like that extends the optical cable longer. In addition, when a low-loss connection is not obtained in the optical cable connection operation, the connection end of the optical cable can be cut and redone. Furthermore, even when the optical cable is damaged due to maintenance work or the like, it is possible to reconnect by cutting up to the damaged portion. Note that if the optical cable is bent too much, the transmission characteristics deteriorate and it is broken in an extreme case. Therefore, the excess length of the optical cable is stored in the excess length storage portion so as to maintain a predetermined bending radius. The optical cable includes a thick optical cable 4a in which a messenger wire and a plurality of optical fibers are bundled, and a thin optical cable 4b made of a single optical fiber. Both types of optical cables can be introduced into the optical terminal device 1 according to the present invention. Has been.

  The optical terminal device 1 according to the present invention is installed upright as shown in FIG. In this case, the attachment piece 15a is formed to extend upward from the bottom surface portion on the upper portion of the main body portion 2, and the pair of attachment pieces 15b and 15c are formed to extend downward from the bottom surface portion of the main body portion 2. ing. Therefore, the optical terminal device 1 is placed upright and opposed to the mounting surface, and screws are inserted into these mounting pieces 15a, 15b, and 15c and screwed to the mounting surface, whereby the optical terminal device 1 is mounted on the mounting surface. Install. Since these mounting pieces 15a, 15b, and 15c are formed so as to protrude further to the back side than the bottom surface portion, a predetermined interval is generated between the bottom surface portion of the installed optical terminal device 1 and the mounting surface. Become. A plurality of first ventilation holes 11 are formed on the front side of the side surface portion located on the lower side of the main body 2 in the optical terminal device 1 installed upright in this manner, and a plurality of second ventilation holes are formed on the back side. 12 is formed. In addition, a coaxial terminal hole from which two coaxial terminals 14 provided integrally with the electronic circuit unit 31 protrude is formed on the side surface portion, and two cable introduction holes 13a and 13b for introducing an optical cable are formed on the left side. And is formed on the right side. In addition, the lid portion 3 is arranged on the side surface portion located on the upper side of the main body portion 2 so as to overlap, and a ventilation opening 20 is formed by a gap formed between them. Furthermore, a plurality of bottom vent holes 16 are formed in the lower part of the bottom surface portion of the main body 2 as shown in FIG. Furthermore, an introduction hole for supplying commercial alternating current to the power supply unit 32 is formed in the side portion located on the lower side, and the power cable 5 is introduced from this introduction hole.

  In the optical terminal device 1 having such a configuration, the electronic circuit unit 31 that is operating while being supplied with power from the power supply unit 32 generates heat along with the operation, and the power supply unit 32 also generates heat. Then, the chassis 30 generates heat, and the air warmed by the chassis rises and is exhausted from the vent hole 20 located at the upper part. By the path a indicated by the broken line, air is sucked into the housing from the second vent 12 and the bottom vent 16, and the sucked air is separated between the back surface of the chassis 30 and the bottom portion of the main body 2. It enters the formed passage and takes heat of the chassis 30 to help dissipate heat. In addition, the air that has entered from the first vent 11 into the casing along the path b indicated by a broken line passes through the gap between the tray portion 6 and the lid 3 and is discharged from the third vent 20 together with the air from the path a. Become so. Heat in the housing can be exhausted by such intake / exhaust through the path a and the path b, and heat generation can be prevented from adversely affecting the electronic circuit unit 31.

Here, FIG. 3 shows a perspective view showing a configuration of the optical terminal device 1 according to the present invention when a part of the upper portion of the bottom surface portion of the main body 2 is cut away.
As shown in this figure, a pair of standing pieces 18 are formed on the inner side of the bottom surface portion 2 e so as to extend from the upper side surface portion to the lower side surface portion substantially parallel to the long side of the main body portion 2. The pair of standing pieces 18 are respectively formed in the vicinity of both side plate portions, and a large number of heat radiation holes 17 are formed in the bottom surface portion 2 e between the pair of standing pieces 18. The rear surface of the chassis 30 is brought into contact with the pair of standing pieces 18 or faced with a slight gap so that a passage is formed between the bottom surface portion 2 e and the chassis 30. In this case, since the optical terminal device 1 is installed outdoors, even if rainwater enters from the heat radiating hole 17, further intrusion can be prevented by the pair of standing pieces 18 and the chassis 30. Further, three elongated bottom vent holes 16 are formed in the lower portion of the bottom surface portion 2e. Furthermore, the mounting surface on which the optical terminal device 1 is installed and the bottom surface portion 2e are separated by the height of the mounting pieces 15b and 15c formed so as to protrude from the lower portion of the bottom surface portion 2e. Sufficient air can be taken in from 16 and the heat radiation hole 17.

Next, FIG. 4 is a perspective view showing a configuration of the optical terminal device 1 in a state where the lid 3 is opened with respect to the main body 2. However, in this figure, the introduced optical cable is omitted.
When the lid 3 is opened with respect to the main body 2, the tray 6 stored in the main body 2 can be seen. An abutting portion projecting in the lateral direction is formed at the lower portion of the side surface portions on both sides of the lid portion 3, and the lower edge below the abutting portion is formed slightly thin. When the lid 3 is closed, the lower edge is fitted into the upper portion of the side surface of the main body 2 to form a rainproof structure. When the lid portion 3 is closed, the contact portion contacts the upper end of the side surface portion of the main body portion 2. A plurality of first ventilation holes 11 are formed in the side surface portion located on the lower side of the main body portion 2, and the coaxial terminal 14 protruding from the electronic circuit unit 31 protrudes from the side surface portion. As shown in the figure, the tray portion 6 is formed with cable sandwiching portions 40 for fixing the optical cables introduced from the cable introduction holes 13a and 13b on the left side and the right side, respectively. The cable sandwiching portion 40 has two sets of sawtooth projections facing each other, and the optical cable 4a can be fixed by sandwiching a thick optical cable 4a in which a messenger wire or a plurality of optical fibers are bundled. . The thin optical cable 4b is fixed by being sandwiched between the two cable sandwiching portions 40 formed in a state where the cable is sandwiched between the bushes.

  The tray portion 6 is formed with two elliptical drum portions, a drum portion 41 and a drum portion 42, and a plurality of guide portions 43 and guide portions 44 formed in an arc shape. . These drum portions 41 and 42 and guide portions 43 and 44 form an extra length storage portion. That is, the extra lengths of the optical cables 4a and 4b introduced from the cable introduction holes 13a and 13b are wound around or along the drum parts 41 and 42 and the guide parts 43 and 44 so as to maintain a predetermined bending radius. Then, it is stored in the extra length storage section. In this case, a plurality of pressing pieces projecting in the shape of eaves are formed at predetermined portions of the drum portions 41 and 42 and the guide portions 43 and 44 so that the optical cables 4a and 4b are not disconnected from the drum portions 41 and 42 and the guide portions 43 and 44. Has been. When the extra lengths of the optical cables 4a and 4b are wound around the drum portions 41 and 42 and the guide portions 43 and 44, the optical cables 4a and 4b introduced from the cable introduction holes 13a and 13b are wound around the cable introduction holes. It can be derived from 13a and 13b and introduced into another optical terminal device having an optical receiving function. Further, the tray portion 6 is formed with a holding portion 46 for holding a mounting device attached to the optical fiber in the optical cables 4a and 4b. Furthermore, a connector receiving portion 48 for inserting an optical connector attached to the tip of the optical cable 4a, 4b is visible. This connector receiving portion 48 is attached to the electronic circuit unit 31.

Next, FIG. 5 is a perspective view showing the configuration of the optical terminal device 1 in a state where the lid 3 is removed from the main body 2 and the tray 6 is removed.
As shown in FIG. 5, a plurality of first ventilation holes 11 and cable introduction holes 13 a and 13 b are formed on the side surface portion located on the lower side of the main body portion 2, and coaxial terminals projecting from the electronic circuit unit 31. 14 protrudes from the side surface. A pair of pivots 19 having a substantially circular cross section are formed on both sides of the side part located on the upper side of the main body 2, and holding pieces 21 formed on both sides of the upper part of the lid 3 are formed on the pivot 19. By fitting and pivoting, the lid 3 can be opened and closed with respect to the main body 2 with the pivot 19 as a rotation axis. When the tray unit 6 is removed from the main body unit 2, the electronic circuit unit 31 and the power supply unit 32 that are attached to and stored in the chassis 30 can be seen. The electronic circuit unit 31 is provided with a connector receiving portion 48 for guiding an optical signal to an internal optical receiving portion, and an optical connector attached to the tip of the optical cable introduced into the connector receiving portion 48 is inserted. It becomes like this. Both sides of the upper portion of the power supply unit 32 are cut, and a passage formed by the chassis 30 and the bottom surface portion 2e is communicated with the third ventilation port 20.

Next, a configuration for accommodating the extra length portions of the optical cables 4a and 4b introduced from the cable introduction holes 13a and 13b in the tray portion 6 will be described with reference to FIG. FIG. 6 is a plan view showing a configuration of the tray portion 6 in which an extra length storage portion for storing the extra length portions of the optical cables 4a and 4b is formed.
The tray portion 6 is formed with two elliptical drum portions, ie, a drum portion 41 and a drum portion 42, and a surplus length storage portion including a plurality of guide portions 43 and guide portions 44 formed in an arc shape. . The optical cables 4a and 4b introduced from the cable introduction hole 13a are clamped and fixed by the cable clamping part 40, bent along the guide part 43 through the holding part 46, and then the outermost guide part in the extra length storage part. And is wound around the extra length storage portion a predetermined number of times. Then, a mounting device 47 mounted on a part connected to another optical cable is sandwiched and held by the holding unit 46. An optical connector 45 is attached to the tip of the connected optical cable, and this optical connector 45 is inserted into the connector receiving portion 48 in the electronic circuit unit 31 and attached. As a result, the optical signal propagated through the introduced optical cable 4 a is received by the electronic circuit unit 31. In the electronic circuit unit 31, the received optical signal is converted into an electrical signal, amplified to a predetermined level, and output from the coaxial terminal 14. In this way, the extra length of the optical cable introduced into the optical terminal device 1 is accommodated in the extra length accommodating portion formed in the built-in tray portion 6.

Next, FIG. 7 shows an enlarged perspective view of the detailed configuration of the holding portion 46 formed on the tray portion 6 of the optical terminal device 1, and FIG. 8 shows a sectional view thereof. The mounting unit 47 held by the holding unit 46 is fixed in a state in which the end portions of the optical cables are fused together, a protective sleeve that protects the fused portion and the inserted optical filter, or the end surfaces of the optical cables are aligned. FIG. 9 is a perspective view showing a configuration in which the protective sleeves 47a and 47b are held in the holding portion 46, and FIG. 10 is a cross-sectional view thereof.
As shown in these drawings, the holding portion 46 that can hold the mounting device 47 such as a protective sleeve is provided on the right side of the tray portion 6 as shown in FIGS. The mounting device 47 can be held and fixed to the tray portion 6. The holding portion 46 includes a first holding piece 46b and a second holding piece 46c, and a flat central wall 46a is formed between the first holding piece 46b and the second holding piece 46c. Since the first holding piece 46b and the second holding piece 46c have a line-symmetric shape, the configuration of the first holding piece 46b will be described as a representative example. The first holding piece 46b has a shape in which a flat plate is bent into an arcuate shape so as to face the central wall portion 46a, and is elastically applied to the tray portion 6 by a support portion 46e formed between the notches 46d. It is supported. On both sides of the support portion 46e in the first holding piece 46b, wing pieces 46f are formed, the distance from the central wall portion 46a becoming narrower toward the end. The surface of the wing piece 46f that faces the central wall 46a is formed so as to be inclined so that the distance from the central wall 46a becomes wider as it goes downward as shown in FIG.

  As shown in FIGS. 9 and 10, the two protective sleeves 47 a and 47 b can be held by the holding portion 46 having such a configuration. The protective sleeve 47a is attached to a boundary portion between the optical fiber 4c and the optical fiber 4c ', and a fused portion of the optical fiber 4c and the optical fiber 4c' or an optical filter is accommodated therein. The protective sleeve 47b is attached to the boundary between the optical fiber 4d and the optical fiber 4d ', and a fused portion of the optical fiber 4d and the optical fiber 4d' or an optical filter is accommodated therein. The protective sleeve 47a is sandwiched and held between the central wall portion 46a and the first holding piece 46b, and the protective sleeve 47b is sandwiched and held between the central wall portion 46a and the second holding piece 46c. In this case, the first holding piece 6b is elastically supported by the tray portion 6 by the support portion 46e, and the central wall portion 46a is closer to the end portion and the surface of the blade piece 46f facing the central wall portion 46a. As shown in FIG. 10, the protective sleeve 47a is pressed with sufficient pressing force by both end portions of the blade piece 46f, and the protective sleeve 47a is brought into contact with the lower surface of the tray portion 6 and the central wall portion 46a. It can be held in contact. Thereby, the protective sleeve 47 a can be reliably held by the holding portion 46. The same applies to the protective sleeve 47b sandwiched and held between the second holding piece 46c and the central wall portion 46a.

Next, the configuration of another embodiment of the holding unit is shown in FIG.
The holding portion 146 that holds the mounting device 47 such as the protective sleeves 47 a and 47 b shown in FIG. 11 is configured to be able to hold and fix a plurality of protective sleeves to the tray portion 6. The holding portion 146 includes a first holding piece 146b and a second holding piece 146c, and a flat plate-like central wall portion 146a is formed between the first holding piece 146b and the second holding piece 146c. Since the first holding piece 146b and the second holding piece 146c have a line-symmetric shape, the configuration of the first holding piece 146b will be described as a representative example. The first holding piece 146b is formed in a flat plate shape that faces the central wall portion 146a, and bent pieces 146f that are bent toward the central wall portion 146a are formed at both ends thereof. The first holding piece 146b is elastically supported on the tray portion 6 by a support portion 146e formed between the notches 146d.

  The two protective sleeves 47a and 47b can be held by the holding portion 146 having such a configuration. In this case, the protective sleeve 47a is sandwiched and held between the central wall 146a and the first holding piece 146b, and the protective sleeve 47b is sandwiched and held between the central wall 146a and the second holding piece 146c. The The first holding piece 146b is elastically supported by the tray portion 6 by the support portion 146e, and is pressed with sufficient pressing force by the bent pieces 146f formed at both ends, so that the protective sleeve 47a is centered. It can be held in contact with the wall 146a. Accordingly, the protective sleeve 47a can be reliably held by the holding portion 146. The same applies to the protective sleeve 47b sandwiched and held between the second holding piece 146c and the central wall portion 146a.

Next, the configuration of still another embodiment of the holding unit is shown in FIG.
The holding portion 246 that holds the mounting device 47 such as the protective sleeves 47 a and 47 b shown in FIG. 12 is configured to be able to hold and fix a plurality of protective sleeves to the tray portion 6. The holding portion 246 includes a first holding piece 246b and a second holding piece 246c, and a flat central wall portion 246a is formed between the first holding piece 246b and the second holding piece 246c. Since the first holding piece 246b and the second holding piece 246c have a line-symmetric shape, the configuration of the first holding piece 246b will be described as a representative example. The first holding piece 246b is formed in a flat plate shape facing the central wall portion 246a, and bent pieces 246f bent toward the central wall portion 246a are formed at both ends thereof. The bent piece 246f has a wedge shape so that the distance from the central wall portion 246a increases toward the bottom. The first holding piece 246b is elastically supported by the tray portion 6 by a support portion 246e formed between the notches 246d.

  The two protective sleeves 47a and 47b can be held by the holding portion 246 having such a configuration. In this case, the protective sleeve 47a is sandwiched and held between the central wall 246a and the first holding piece 246b, and the protective sleeve 47b is sandwiched and held between the central wall 246a and the second holding piece 246c. The The first holding piece 246b is elastically supported by the tray portion 6 by the support portion 246e, and the bent pieces 246f formed at both ends are formed in a wedge shape. While being pressed with sufficient pressing force, the protective sleeve 47a can be held in contact with the lower surface of the tray portion 6 and the central wall portion 246a. Thereby, the protective sleeve 47a can be reliably held by the holding portion 246. The same applies to the protective sleeve 47b sandwiched and held between the second holding piece 246c and the central wall portion 246a.

Next, the configuration of still another embodiment of the holding unit is shown in FIG.
The holding portion 346 that holds the mounting device 47 such as the protective sleeves 47 a and 47 b shown in FIG. 13 is configured to be able to hold and fix a plurality of protective sleeves to the tray portion 6. The holding portion 346 includes a first holding piece 346b and a second holding piece 346c, and a flat central wall portion 346a is formed between the first holding piece 346b and the second holding piece 346c. Since the first holding piece 346b and the second holding piece 346c have a line-symmetric shape, the configuration of the first holding piece 346b will be described as a representative example. The first holding piece 346b is formed in a flat plate shape facing the central wall portion 346a, and bent pieces 346f bent toward the central wall portion 346a are formed at both ends thereof. The portion of the first holding piece 346b that faces the central wall portion 346a has a shape in which the lower portion is inclined upward toward the bent piece 346f and the width becomes narrower toward the end. The first holding piece 346b is elastically supported on the tray portion 6 by a support portion 346e formed between the notches 346d.

  The two protective sleeves 47a and 47b can be held by the holding portion 346 having such a configuration. In this case, the protective sleeve 47a is sandwiched and held between the central wall 346a and the first holding piece 346b, and the protective sleeve 47b is sandwiched and held between the central wall 346a and the second holding piece 346c. The The first holding piece 346b is elastically supported by the tray portion 6 by the support portion 346e, and the width of the bent piece 346f is narrowed toward the end, so that the bent piece 346f has an appropriate elasticity. The protective sleeve 47a is pressed with a sufficient pressing force, so that the protective sleeve 47a comes into contact with the central wall portion 346a and is securely held. The same applies to the protective sleeve 47b sandwiched and held between the second holding piece 346c and the central wall portion 346a.

Next, a perspective view showing a detailed configuration of the main body 2 of the optical terminal device 1 is shown in FIG.
As shown in FIG. 14, the main body 2 has a box-like shape, and when installed, the first side surface portion 2a positioned on the lower side, the second side surface portion 2b positioned on the right side, and It is provided with a third side surface portion 2c positioned on the upper side when installed, a fourth side surface portion 2d positioned on the left side, and a bottom surface portion 2e. The first side surface portion 2a is formed with three coaxial terminal holes 14a for leading out the coaxial terminal 14, including a spare, and a plurality of first ventilation holes 11 and two cable introduction holes are formed at the tip thereof. 13a and 13b are formed. Moreover, although not shown in figure, the some 2nd ventilation port 12 is formed in the boundary part with the bottom face part 2e of the 1st side part 2a. The second side surface portion 2b and the fourth side surface portion 2d have substantially the same shape that is plane-symmetric, and have a structure in which the insertion edge 3e of the lid portion 3 is inserted. A pair of pivots 19 are formed on both sides of the third side surface portion 2c so as to protrude. Ribs that receive the peripheral edge of the chassis 30 are formed inside the first side surface portion 2a to the fourth side surface portion 2d.

  Three bottom vent holes 16 are formed in the bottom surface portion 2e at the boundary with the first side surface portion 2a. In addition, a pair of standing pieces 18 that are substantially parallel to the second side face portion 2b and the fourth side face portion 2d are formed on the bottom face portion 2e, and a large number of heat radiation holes 17 are provided between the standing pieces 18. Is formed. Outside air enters through the heat radiating holes 17 to cool the chassis 30 and is exhausted from the upper third ventilation port 20 or the like. The rear surface of the chassis 30 is brought into contact with the pair of standing pieces 18 or facing each other with a slight gap, and the heat radiation for communicating with the bottom vent hole 16 between the rear surface of the chassis 30 and the inner surface of the bottom surface portion 2e. The passage is formed. The pair of standing pieces 18 function to prevent further intrusion when rainwater enters from the heat radiation hole 17.

  In the above description, the optical terminal device includes the optical receiving unit. However, the present invention is not limited to this, and can be applied to a surplus length storage device that stores the surplus length portion of the optical cable.

It is a perspective view which shows the structure of the Example of the optical terminal device concerning this invention. It is a side view which shows the structure of the Example of the optical terminal device concerning this invention with sectional drawing. It is a perspective view which shows the structure at the time of partially notching the upper part of the bottom face part in the main-body part of the optical terminal device concerning this invention. It is a perspective view which shows the structure of the state which opened the cover part with respect to the main-body part in the optical terminal device concerning this invention. It is a perspective view which shows the structure of the state which removed the cover part from the main-body part and removed the tray part in the optical terminal device concerning this invention. It is a top view which shows the structure of the tray part in which the surplus length of the optical cable was accommodated in the surplus length accommodating part in the optical terminal device concerning this invention. It is a perspective view which expands and shows the detailed structure of the holding | maintenance part currently formed in the tray part in the optical terminal device concerning this invention. It is sectional drawing which expands and shows the detailed structure of the holding | maintenance part currently formed in the tray part in the optical terminal device concerning this invention. It is a perspective view which expands and shows the structure which hold | maintains a protection sleeve by the holding part currently formed in the tray part in the optical terminal device concerning this invention. It is sectional drawing which expands and shows the structure which hold | maintains a protection sleeve with the holding part currently formed in the tray part in the optical terminal device concerning this invention. It is a perspective view which expands and shows the detailed structure of the other holding | maintenance part currently formed in the tray part in the optical terminal device concerning this invention. It is a perspective view which expands and shows the detailed structure of the other holding | maintenance part currently formed in the tray part in the optical terminal device concerning this invention. It is a perspective view which expands and shows the detailed structure of the other holding | maintenance part currently formed in the tray part in the optical terminal device concerning this invention. It is a perspective view which shows the detailed structure of the main-body part in the optical terminal device concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical terminal device, 2 Main body part, 2a 1st side surface part, 2b 2nd side surface part, 2c 3rd side surface part, 2d 4th side surface part, 2e bottom surface part, 3 cover part, 3e fitting edge, 4a optical cable, 4b optical cable 4c optical fiber, 4d optical fiber, 5 power cable, 6 tray portion, 6a insertion hole, 11 first ventilation port, 12 second ventilation port, 13a, 13b cable introduction hole, 14 coaxial terminal, 14a coaxial terminal hole, 15a Mounting piece, 15b Mounting piece, 16 Bottom ventilation hole, 17 Radiation hole, 18 Standing piece, 19 Axis, 20 Third ventilation hole, 21 Holding piece, 30 Chassis, 31 Electronic circuit unit, 32 Power supply unit, 40 Cable clamp Part, 41 drum part, 42 drum part, 43 guide part, 44 guide part, 45 optical connector, 46 holding part, 46a central wall part, 46b first holding Piece, 46c second holding piece, 46d notch, 46e support, 46f wing piece, 47 mounting device, 47a protective sleeve, 47b protective sleeve, 48 connector receiving portion, 146 holding portion, 146a central wall portion, 146b first holding Piece, 146c second holding piece, 146d notch portion, 146e support portion, 146f bent piece, 246 holding portion, 246a central wall portion, 246b first holding piece, 246c second holding piece, 246d notch portion, 246e support portion, 246f Bending piece, 346 Holding portion, 346a Central wall portion, 346b First holding piece, 346c Second holding piece, 346d Notch portion, 346e Support portion, 346f Bending piece

Claims (6)

An electronic circuit unit having at least an optical receiver that converts an optical signal transmitted by an optical cable into an electrical signal and outputs the electrical signal;
A power supply unit for supplying power to the electronic circuit unit;
A chassis to which the electronic circuit unit and the power supply unit are attached;
A tray portion that is disposed on the electronic circuit unit and the power supply unit and in which a surplus length accommodating portion that accommodates a surplus length portion of the introduced optical cable is formed;
A chassis comprising the chassis to which the electronic circuit unit and the power supply unit are attached; a main body that houses the tray; and a lid that is fixed to the main body so as to be openable and closable.
The tray portion is formed with a holding portion for holding an elongated attachment device attached to the optical cable, and the holding portion includes a wall portion and a plate-like holding piece facing the wall portion, and the wall An optical terminal device, wherein when the mounting device is disposed between a holding portion and the holding piece, the mounting device is elastically pressed and held by the wall portion by the holding piece.   2. The light according to claim 1, wherein the holding piece in the holding portion is formed in an arcuate shape, and the mounting device is pressed against the wall portion by wing pieces which are both sides of the holding piece. Terminal device.   3. The optical terminal device according to claim 2, wherein the holding piece is formed so that a distance from a surface of the holding piece having an arcuate shape facing the wall portion increases toward a lower side. .   2. The optical terminal device according to claim 1, wherein bent pieces that are bent toward the wall portion are formed at both ends of the holding piece.   5. The optical terminal device according to claim 4, wherein the bent piece bent toward the wall portion is formed such that the distance from the wall portion increases toward the bottom. 5. The optical terminal device according to claim 4, wherein a width of the holding piece is formed so as to gradually become narrower from a substantially central portion toward the bent piece.

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