JPH03171796A - Optical unit mounting structure on shelf for optical communication equipment - Google Patents

Abstract

PURPOSE:To prevent removal of an optical unit from a shelf without care and to protect an optical fiber by providing an extension cover on a surface plate of an optical fiber excess length processor. CONSTITUTION:Part of a surface plate 18 of an optical fiber excess length processor 8 is extended to a lower side to integrally form an extension cover 19, with which part of a surface plate 11 of an optical unit 10 and fittings 13 of the unit are covered. The cover 19 is provided to eliminate the operation of a card lever 13 of an upper side as long as the cover 19 is removed together with the plate 18 even if the unit 10 is intended to be removed by operating the levers 13 provided above and below the unit 10. Thus, the unit 10 can be prevented from being removed without removing the plate 18 of the processor 8 erroneously by an operator.

Description

[Detailed Description of the Invention] Overview A structure for housing an optical unit in a shelf in an optical communication device, which prevents damage to the optical fiber due to inadvertence when pulling out the optical unit from the shelf, and securely prevents the optical fiber from being damaged while the optical unit is being pulled out. A printed board unit with electronic components mounted thereon and an optical unit equipped with an optical transceiver module are housed in a shelf with guide rails, and an optical fiber surplus length processing section is installed on the top of the shelf. In an optical communication device in which an optical fiber from the optical fiber surplus length processing section is connected to the optical transmitting/receiving module via an optical connector, a part of the front cover of the optical fiber surplus length processing section is extended downward. It is arranged so that it covers a part of the surface plate of the optical unit.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for accommodating an optical unit on a shelf in an optical communication device.

For example, in optical communication equipment that handles multi-channel transmission signals, multiple printed circuit board units with electronic components mounted on them and optical units with optical transceiver modules are housed in a shelf, and multiple shelves are then mounted on a rack. By doing so, we aim to achieve high-density packaging and improve maintainability.

Each printed board unit and optical unit are housed in a shelf so that they can be inserted into and removed from the shelf, and the optical fibers connected to each optical unit can be connected and disconnected using the optical connector after the optical unit has been removed from the shelf by an appropriate amount. It has become.

For this reason, there is a need for a structure for accommodating an optical unit in a shelf in which no excessive force is applied to the optical fiber when the optical unit is pulled out from the shelf.

BACKGROUND ART FIG. 8 is a perspective view of a conventional shelf attached to a rack and an optical fiber surplus length processing section. A plurality of sets of shelves and optical fiber surplus length processing units are attached to the racks 2 and 4 in the vertical direction, and one set of shelves 6 and optical fiber surplus length processing unit 8 is shown in the figure. The shelf 6 includes a plurality of printed board units 9 on which electronic components are mounted and two optical units 10 on which optical transceiver modules are mounted.
is housed so that it can be inserted and removed in eight directions. light unit 10
The optical fiber l2 connected to is guided to another device such as a shelf through an opening 14 provided on the top surface or an opening 16 provided on the side surface of the optical fiber surplus length processing section 8,
By removing the surface plate (front cover) 18 attached to the front surface of the optical fiber extra length processing section 8 with screws 20, the extra length of the optical fiber l2 accommodated in the optical fiber extra length processing section 8 is processed. is now possible.

The reason why the optical fiber excess length processing IB8 is provided between the shelves is to define a space for accommodating the excess length of the optical fiber, and the purpose is to define the space for accommodating the excess length of the optical fiber. Through ventilation holes (not shown) and ventilation holes 18a provided in the surface plate 18, a heated air flow path is formed for each set of individual shelves and optical fiber surplus length processing sections to achieve natural cooling of the device. It's for a reason.

FIG. 9 is a diagram for explaining the attachment and detachment of the optical fiber to and from the optical unit, and shows a state in which the surface plate of the optical fiber surplus length processing section 8 is removed and the optical unit 10 is pulled out halfway. The optical fiber 12 is detachably connected to, for example, an optical transceiver module 22 mounted on the optical unit 10 by an optical connector 24, and by pulling out the optical unit 10 as shown in the figure, the optical connector 2
4 attachment/detachment operations can be performed. In addition, storing the extra length part 12a of the optical fiber inside the optical fiber extra length processing section 8 allows the optical unit 1 to be stored without drawing the outer optical fiber from the optical fiber extra length processing section 8.
This is to enable insertion and removal of 0.

However, with the conventional optical unit storage structure as described above, the operation of pulling out the optical unit was done only by the operator's intuition, so if the optical unit was pulled out too far, the optical unit could fall off from the shelf. However, there are problems in that the optical fiber may be damaged or that it becomes complicated to re-accommodate the excess length of the optical fiber in the optical fiber excess length processing section.

Therefore, the present applicant previously proposed Japanese Patent Application No. 63-2-42-393 as a structure for solving this problem.

Problems to be Solved by the Invention Although the optical unit housing structure described in this prior invention has achieved its intended purpose to some extent, it was later discovered that it had the following drawbacks. This will be explained with reference to FIG.

In the figure, a guide rail 28 is formed by punching out the bottom plate 26 of the shelf, and a display plate 30 is placed on the front side of the bottom plate 26 in the direction of insertion and removal of the optical unit 10.
It is fixed so that it protrudes slightly above 6.

On the other hand, a mounting bracket 32 is screwed to the optical unit 10, and a hook-shaped elastic member 34 is attached to the mounting bracket 32 with a screw 36. The hook-shaped elastic member 34 is shaped like a band-shaped leaf spring, and has a Z. The shape of the hook part 34a is fixed. When the optical unit 10 is pulled out, this hook portion 34a is locked to the tip of the display board 30,
This prevents the optical unit 10 from being pulled out any further.

However, when a worker pulls out the light unit while supporting the front side with his/her hand, there is a difference in the dimension between the upper and lower guide rails of the shelf and the vertical dimension of the printed board that guards the light unit, and the upper surface board that forms the upper guide rail. The deflection of the light unit may cause the light unit to lift as shown. This tendency is particularly noticeable when the optical unit is pulled out from the shelf disposed below the rack. Therefore, in the structure of the prior invention described above, there is a problem in that the hook-shaped elastic member does not engage with the display board and the light unit is completely pulled out from the shelf. Measures have been taken to increase the strength of the top plate, but this inevitably increases costs.

Furthermore, in the conventional housing structure shown in FIGS. 8 and 9, the instruction is to remove the surface plate of the optical fiber surplus length processing section before removing the optical unit from the shelf. The structure is such that the optical unit can be pulled out even if you forget to remove the face plate. If the optical unit is pulled out from the shelf without removing the surface plate, there is a problem in that the optical fiber gets caught on the surface plate of the optical fiber surplus length processing section and is damaged.

Furthermore, the surface plate of the optical unit must be frame grounded for radio wave and static electricity countermeasures. That is, the face plate must be brought to ground potential. In the conventional structure, the frame ground is routed from the front panel to the ground pattern on the printed board constituting the optical unit, to the rear connector, to the back board, and to the frame ground terminal. Therefore, it has been necessary to take into account the design of the component arrangement and pattern arrangement on the printed board so as not to adversely affect the electric circuit.

The present invention has been made in view of these points, and its purpose is to prevent the optical fibers from being inadvertently damaged when the optical unit is removed from the shelf, and to ensure that the optical fibers are not damaged while the optical unit is being removed. An object of the present invention is to provide a structure for accommodating an optical unit in a shelf in an optical communication device that can be locked to a shelf.

Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention provides a printed board unit in which electronic components are mounted in a shelf having guide rails, and an optical unit in which an optical transceiver module is mounted. an optical fiber surplus length processing unit is provided in the upper part of the shelf, and an optical fiber from the optical fiber surplus length processing unit is connected to the optical transceiver module via an optical connector. The present invention is characterized by a structure for accommodating an optical unit in a shelf, in which a part of the front cover of the extra length processing section extends downward to cover a part of the surface plate of the optical unit.

In addition, in order to securely lock the optical unit during extraction, a protrusion is provided on the front side of the shelf bottom plate in the optical unit insertion/extraction direction, and a hook-shaped elastic member with a hook portion with a square hole is attached to the optical unit. .

Further, the hook-shaped elastic member is formed from a conductive material, and the surface plate of the optical unit is electrically connected to the hook-shaped elastic member through a conductive pattern provided on the printed board of the optical unit. The structure is such that the hook-shaped elastic member is brought into contact with the shelf.

Function: By extending a part of the front cover of the optical fiber surplus length processing section downward and covering a part of the surface plate of the optical unit, it is necessary to remove the optical fiber surplus length in order to extract the optical unit. This means that the front cover of the processing unit must be removed before it can be pulled out, which will ensure that damage to the optical fiber that previously occurred due to operator carelessness and pulling out the optical unit without removing the front cover can be reliably prevented. can.

In addition, a protrusion is provided on the front side of the shelf bottom plate in the optical unit insertion/extraction direction, and a hook-shaped elastic member with a hook portion with a square hole is attached to the optical unit, making it easier to remove the optical unit from the shelf. , it becomes possible to reliably lock the square hole to the protrusion, and it is possible to prevent problems such as damage to the optical fiber that would occur if the optical unit is pulled out from the shelf without being locked halfway.

Furthermore, by configuring the frame grounding path of the optical unit's surface plate as described above, it is possible to reliably lower the optical unit's surface plate to the ground potential, and also to ensure that the optical unit's surface plate can be lowered to the ground potential. The degree of freedom in component placement and pattern placement can be improved.

Example Embodiments of the present invention will be described in detail below based on the drawings.

In the description of this embodiment, structural parts that are substantially the same as those of the conventional example shown in FIGS. 8 to 10 are designated by the same reference numerals, and a portion of the description thereof will be omitted.

FIG. 1 is a perspective view of a shelf and an optical fiber surplus length processing section showing an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of the embodiment with an optical unit pulled out from the shelf. As shown in FIG. 1, a part of the surface plate (front cover) 18 of the optical fiber surplus length processing section 8 is extended downward to integrally form an extension cover 19, and this extension cover 1
9 is arranged so as to cover a part of the surface plate 11 of the optical unit 10 and the insertion/extraction tool (card lever) 13 of the optical unit. The extension cover 19 is provided with a plurality of openings 19a through which the unit name displayed on the card lever 13 can be read.

By providing such an extension cover 19, even if an attempt is made to pull out the optical unit 10 by operating the card levers 13 provided above and below the optical unit 10, the extension cover 1
9 together with the surface plate 18 of the optical fiber full length processing section 8, the upper card lever 1°3 cannot be imitated. This prevents the optical unit 10 from being pulled out without removing the surface plate 18.

Further, when the card lever 13 is provided only on the lower side of the optical unit 10, the extension cover 19 covers a part of the surface plate 11 of the optical unit 10, so that the surface plate 11 of the optical unit 10 Since the optical unit 10 cannot come out any further when it hits the extension cover 19, the optical fiber can be protected.

As shown in FIGS. 2 and 3, a display plate 30 that slightly protrudes above the bottom plate 26 is fixed to the front side of the shelf 6. Further, a protrusion 40 is provided corresponding to each optical unit 10 on the front side in the insertion/extraction direction. 28
is a guide rail formed by punching out the bottom plate 26 of the shelf, and the optical unit 10 is housed in the shelf 6 along this guide rail 28 so as to be insertable and removable. If the guide rail 28 is made by this processing method, an opening is formed in the bottom plate 26 of the shelf 6, so there is no need to separately form a ventilation hole.

A metal fitting 32 for attaching a hook-shaped elastic body member is screwed to the optical unit 10, and by bending a steel plate, this metal fitting 32 can be attached to the attachment portion 32a to the light unit 10 and the hook-shaped elastic body member 42. portion 32b and the hook-shaped elastic member 4
It has a stopper portion 32C that limits the elastic deformation range of No. 2. The hook-shaped elastic body member 42 has a shape as shown in FIG. 4, and has a Z-shaped hook portion 42 at the tip thereof by bending a belt-shaped plate spring member made of stainless steel, for example.
A, and a square hole 43 is provided in the hook portion 42a. The hook-shaped elastic member 42 is attached to the mounting portion 32b of the metal fitting 32.
is screwed to.

Next, the operation of this embodiment will be explained with reference to FIGS. 5 and 6.

When the optical unit 10 is inserted into the shelf 6, the hook-shaped elastic member 42 is elastically deformed and comes into contact with the bottom plate 26 of the shelf, as shown in FIG. 5(A). When the optical unit 10 is pulled out, the hook-shaped elastic member 42 falls into the hole 28H of the guide rail 28, but as shown in FIG. (
Since the bent portion) hits the end face of the hole portion 28a and the hook-shaped elastic member 42 is automatically lifted as shown by arrow B,
The optical unit 10 can be pulled out smoothly. When the optical unit 10 is further pulled out, the square hole 43 of the hook-shaped elastic member 42 is engaged with the protrusion 40 as shown in FIG. 5(C), so that further extraction of the optical unit 10 is prevented.

In this embodiment, as shown in FIG. 7, the locking amount is increased by the dimension h compared to the prior invention shown in FIG. Even if the optical unit is pulled out, the optical unit can be securely locked.

If you want to completely pull out the optical unit 10, press the hook part 42a in the direction shown by arrow A until it abuts against the stopper part 32C of the metal fitting 32, as shown in FIG. 6(A). By releasing the lock, the light unit 1
0 can be completely extracted. When newly inserting the extracted optical unit 10 into the shelf 6, as shown in FIG. 6(B), the optical unit 10 is inserted into the guide rail 2.
8 and insert it into the shelf 6, the hook part 4
The hook-shaped elastic body member 42 is easily elastically deformed by lifting the inclined part 2a shaped by the display board 30, and the hook part 42a passes through the display board 30 and the protrusion 40, so that the light unit 10 can be easily moved. can be inserted into the shelf 6.

In addition, by making the hook-shaped elastic member 42 from a conductive material such as stainless steel, the surface plate 1 of the optical unit 10 can be completely inserted into the shelf 6.
1 to the hook-shaped elastic member 42 through a conductive pattern provided on the printed board of the optical unit, and further bring the hook-shaped elastic member 42 into contact with the shelf 6 by its elastic force. The surface plate 11 of the optical unit 10 can be reliably brought to ground potential.

Effects of the Invention By providing the extension cover on the surface plate of the optical fiber surplus length processing section, the optical unit can be prevented from being inadvertently pulled out from the shelf, and the optical fiber can be protected. Furthermore, since the optical unit can be reliably locked in the middle of removal, there is no risk of accidentally dropping the optical unit and damaging the optical fiber, contributing to improving the reliability of optical communication equipment. .

In addition, since the surface plate of the optical unit can be reliably brought down to the ground potential through the hook-shaped elastic member formed from a conductive material, the arrangement of components and patterns on the printed circuit board that constitutes the optical unit can be made easier. The degree of freedom can be increased.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a shelf and optical fiber surplus length processing unit showing an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the embodiment with the optical unit pulled out, and Fig. 3 is the locked state of the optical unit. FIG. 4 is a perspective view of a piece-shaped elastic body member; FIGS. 5 and 6 are explanatory views of the operation of the embodiment of the present invention; FIG. 7 is an enlarged sectional view of a hook portion of a hook-shaped elastic body member; Fig. 8 is a perspective view of a conventional first-class shelf and optical fiber surplus length processing unit, Fig. 9 is an enlarged perspective view of the conventional example shown in Fig. 8 with the optical unit extracted, and Fig. 10 is a perspective view of the conventional example shown in Fig. 8. FIG. 3 is a diagram illustrating problems with the claimed invention. ... Shelf, ... Optical fiber extra length processing section, 0... Optical unit, ■... Surface plate, 2... Optical fiber, 8... Surface plate (front cover), 9... - Extension cover 0...5 protrusions, 2...hook-shaped elastic member, 3...square hole. 10 3o 40: 42: Kabuto E5-/To4 (Show 1 anti'teκ $Rff5#I5i Headquarters 12 Light unit's th1 life color water 1 糾Ne みきょう 3rd picture phrase form 51L column Japan J Sai Shinnekiri Diagram 4 @ Inventor Tomoyuki Hongo Kawasaki, Kanagawa Prefecture 1015 Kamiodanaka, Nakahara-ku, Fujitsu Limited

Claims (3)

[Claims] 1. A printed board unit (9) in which electronic components are mounted in a shelf (6) having a guide rail (28) and an optical unit (10) in which an optical transceiver module (22) is mounted.
), an optical fiber extra length processing section (8) is provided on the upper part of the shelf (6), and the optical fiber (12) from the optical fiber extra length processing section (8) is connected via an optical connector (24). In the optical communication device connected to the optical transceiver module (22), the front cover (18) of the optical fiber surplus length processing section (8)
A part (19) of the light unit (10) is extended downward.
1. A structure for accommodating an optical unit on a shelf in an optical communication device, characterized in that the structure covers a part of a surface plate (11) of the optical communication device. 2. The light unit (10) of the shelf bottom plate (26)
A protrusion (40) is provided on the front side in the insertion/extraction direction, and a hook portion (42) having a square hole (43) is provided in the optical unit (10).
a) When attaching the hook-shaped elastic member (42) and extracting the optical unit (10) from the shelf (6),
2. The structure for housing an optical unit in a shelf according to claim 1, wherein the square hole (43) is engaged with a projection (40). 3. The hook-shaped elastic member (42) is formed of a conductive material, and the hook-shaped elastic member (42) is connected to the surface plate (11) of the optical unit (10) through a conductive pattern provided on the printed board of the optical unit. 42) and further bring the hook-shaped elastic member (42) into contact with the shelf (6), thereby lowering the surface plate (11) of the optical unit (10) to the ground potential. The structure for housing an optical unit in a shelf according to claim 2.