JP2752223B2 - Printed wiring board storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a printed wiring board storing subrack which stores a printed wiring board and has a motherboard attached thereto.

(Prior Art) A general subrack accommodating a printed wiring board will be described with reference to the drawings.

As shown in FIG. 6, a general printed wiring board 11 has a front panel 13 mounted on a front surface of a printed circuit board 12, and then a display 14 and a setting device 15 mounted on the surface of the panel 13. Male connector on back of printed circuit board 12
16 are installed. FIG. 7 shows an external view of a general subrack 17 for housing such a printed wiring board 11. As shown in FIG. That is, flanges 19 are provided on the left and right sides on the front side of the side panel 18, and a female connector 20 is attached to the rear part of the printed wiring board 11. Lead pin 24 of female connector 20
Then, the input / output signal line 25 is connected by soldering or a wire wrapper. Further, guide rails 21 for inserting the printed wiring board are attached to the upper and lower portions of the printed wiring board 11. In mounting the subrack 17 on the box, the flange 19 of the subrack 17 is generally fixed to frames 23 provided on the left and right sides of the box 22, as shown in FIG.

However, recently, the wiring method of directly connecting the input / output signal line 25 to the lead pin 24 of the female connector 20 attached to the subrack as described above by soldering or connecting with a wire wrapper is rarely used, and is shown in the rear view of FIG. The female connector 20 is press-fitted into the multilayered printed circuit board 26 as described above, and after completing the connection between the connectors, a motherboard-type subrack 27 having the printed wiring board 26 attached to the back side of the subrack 17 is employed. Has become mainstream.

On the other hand, as shown in FIG. 9, a display 14 and a setting device 15
In addition to the above, a connector 28 for input / output signals is newly attached, and a printed wiring board 29 to which the male connector 16 is attached is used in the rear part of the printed circuit board 12 as in the related art. The printed wiring board 29 is housed in the motherboard-type subrack 27 shown in FIG.

(Problems to be Solved by the Invention) By the way, the current mainstream printed wiring board having a front connector is housed in a motherboard-type subrack and efficiently mounted on a housing. Then there is an inconvenience. That is, when the printed wiring board having the front connector is housed in a motherboard-type subrack, the input / output signal lines are connected to the front connector of the printed wiring board from the rear side of the housing.
As shown in the figure, it is necessary to provide an empty space 30 for wiring on the lower front surface of each subrack 27. Therefore, as shown in FIG. 12, after the input / output signal line 31 is drawn directly to the front from the empty space 30 between the upper subrack 27 and the lower subrack 27,
After connecting to the front connector 28 of the printed wiring board 29 or accommodating the input / output signal lines 31 as shown in FIG. 13 and attaching the wiring case 32 to the empty space 30 to facilitate the wiring processing,
The input / output signal line 31 is drawn out to the front side through the wiring case 32 and connected to the front connector 28 of the printed wiring board 29 by a method such as that.

Thus, providing the empty space 30 for wiring on the lower front surface of the subrack 27 deteriorates the mounting efficiency by the empty space for wiring when the subrack 27 is mounted on the housing. . As a result, the number of surfaces of the housing is increased or the number of subrack mounted is reduced, which may restrict the required system configuration, which is not preferable. Further, it is not preferable to pass the input / output signal lines 31 under the sub-rack 27 and wire them, because the printed wiring board 29 may be damaged by electromagnetic induction or the like. Further, there is a disadvantage that the input / output signal line 31 narrows the ventilation hole of the subrack 27, and the cooling effect of the printed wiring board 29 may be reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a printed wiring board storage device that increases the mounting strength of a subrack when mounted on a housing and enables effective use of the front space of the subrack. It is in.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a printed wiring board housing support in which a printed wiring board is housed, wiring is performed on a front surface, and a motherboard is mounted on a rear portion. In a printed wiring board storage device including a black (hereinafter, referred to as a subrack) and a housing in which a plurality of the subrackes are arranged so as to be overlapped in a vertical direction, an upper surface of a substantially central portion of the subrack in a depth direction; A flange formed on the lower surface in a direction perpendicular to the storage direction of the printed wiring board is provided, and the depth of the housing is made deeper than the depth of the subrack, so that the subrack front surface and the both sides of the housing when the subrack is mounted. The space between the subrack and the space inside the subrack passes through the side of the subrack from the back of the housing to the front of the printed circuit board. In which it characterized in that a cable duct for accommodating the signal line routed Kuta side.

(Operation) According to the present invention, it is possible to reduce the width dimension of the subrack without changing the number of stored printed circuit boards. The effect of electromagnetic induction or the like can be eliminated. In addition, it is possible to secure a wide processing range of the external cable on the front surface of the subrack and to reduce the stress applied to the flange portion without affecting the cooling effect of the printed wiring board.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

 FIG. 1 is a perspective view of one embodiment of the present invention.

In the figure, an upper flange 3 is mounted in the width direction at the upper center of the side panels 2 on both sides of the subrack 1, a lower flange 4 is mounted in the width direction at the lower center, and a motherboard 5 is mounted at the rear. ing. Guide rails 6 for inserting a printed wiring board are attached to the upper and lower portions of the subrack 1. Using this guide rail 6, a printed wiring board 7 having a front connector is accommodated in the subrack 1 as shown.

In order to mount the subrack 1 having the above-described configuration on the housing, as shown in FIGS.
The upper flange 3 and the lower flange 4 are fixed to the frame 8 extending in the lateral direction of the housing by screwing with the fixing screws 10, respectively, and then connected to the front lower part of each subrack 1 for connecting the front connector of the printed wiring board. A wiring duct 9 for accommodating the input / output signal lines is mounted. In FIG. 2, the uppermost wiring duct among the four wiring ducts is not shown, and the second and third wiring ducts are partially cut away.

Next, features of the present embodiment will be described in comparison with a conventional example.
That is, in the subrack of this embodiment shown in FIG. 1 and the conventional subrack shown in FIG.
The height dimension is b, the depth dimension is c, the width dimension of the flange of this embodiment is e, and the width dimension of the conventional flange is d. Then, since the subrack body portion is the same, the number of printed wiring boards accommodated is the same. However, the outside diameter including the flange is (a + 2
d, b, c), while the present embodiment is (a, b + 2e, c).

By the way, when we look at the conventional subrack case mounting,
In order to connect the input / output signal line 31 from the rear side of the housing to the front connector 28 of the printed wiring board, a wiring case 32 for storing the input / output signal line 31 is attached to the lower side of the subrack 27 and they are combined. Will be used (see Figure 13). Therefore, when the height of the wiring case 32 is 2e, the height of the subrack when the housing is mounted is b + 2e. On the other hand, when the subrack of this embodiment is mounted on the housing,
In order to connect 31 to the front connector 28 of the printed wiring board from the back of the housing via the side surface of the subrack, the size of the wiring duct 9 for storing the input / output signal lines is set to 2e, as shown in FIG. It is attached to the lower front side.

As can be understood from the above description, according to the present embodiment, when the subrack is mounted on the housing, the width is reduced by the dimension of the left and right flanges without changing the height of the conventional subrack. it can. Thereby, conventionally, the input / output signal line was passed through the upper part of the subrack from the rear side of the housing and pulled out to the front side, but in the present embodiment, it became easier to pass the signal line through the side surface of the subrack. The conventional problem on the wiring route can be solved. In addition, the size of the subrack is reduced, so that the size of the housing can be reduced. In addition, external cables may be directly connected to the front connector of the printed wiring board from the lower front part of the housing, but conventionally the flanges were mounted on the front left and right, so the places where the external cables can be stored are on the front side of the subrack, In this embodiment, since the flange portion of the subrack is attached to the central portion in the depth direction, a place where the external cable can be stored can be secured sufficiently wider than before. . Thereby, the processing of the external cable can be facilitated and a mode advantageous for high-density mounting can be obtained.

Next, the stress applied to the flange portion when the subrack is mounted on the housing will be described.

FIG. 5 shows a state in which a conventional subrack having flanges on the left and right sides on the front side is attached to a frame of a housing. For ease of explanation, the positions of the center of gravity are set to 3 / 4c and 1 / 2b, respectively, as shown in the drawing, and considering the moment about the fulcrum point K, the stress F1 received by the flange portion is as follows.

b · F1 = 3/4 · c · w F1 = 3/4 · c · w / b (1) FIG. 4 shows a frame of a subrack according to the present embodiment having a flange at the upper and lower sides of a central portion. FIG. Assuming that the positions of the centers of gravity are 1 / 4c and 1 / 2b, respectively, the stress F2 applied to the flange portion is as follows.

(B + e) · F2 = 1 / 4c · w F2 = 1/4 · c · w / (b + e) (2) From the above equations (1) and (2), the stress received by the flange that supports the weight of the subrack is It can be seen that the distance is determined by the distance between the flange and the center of gravity.

In the subrack of the present invention, since the distance between the flange and the center of gravity is reduced to half of that of the conventional subrack, the stress applied to the flange can be reduced. The stress applied to the flange can be replaced by a tensile stress acting on the fixing screw. In the conventional subrack, the threaded portions mounted on the left and right share the tensile stress. In the subrack of the present invention, since the weight can be shared by the lateral frame attached to the lower side, the stress received by the fixing screw for attaching the frame can be extremely reduced.

Therefore, according to the present invention, it is possible to share the weight of the subrack to the frame on the housing side, and this is an optimal form for various plants requiring seismic strength.

(Effects of the Invention) As described above, according to the present invention, it is possible to reduce the width of the subrack without changing the number of stored printed circuit boards. The influence of electromagnetic induction or the like on the printed wiring board can be eliminated by passing through. Further, a wide processing range of the external cable can be secured on the front surface, and the cooling effect of the printed wiring board is not affected. Further, there is an effect that stress applied to the flange portion can be reduced and the size of the housing can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a part of an embodiment of the present invention, and FIG.
FIGS. 3 and 3 are front and side views of a subrack of the present invention mounted on a housing, and FIGS. 4 and 5 are flanges when the present invention and a conventional subrack are mounted on the housing, respectively. FIG. 6 is a perspective view of a conventional printed wiring board, FIG. 7 is a configuration diagram of a conventional subrack partially removed, and FIG. 8 is a housing of the conventional subrack. FIG. 9 is a perspective view of another conventional printed wiring board, FIG. 10 is a rear perspective view of a conventional motherboard subrack, and FIG. 11 is a housing of the conventional motherboard subrack. Front view, mounted on
FIG. 13 is a diagram for explaining a procedure for connecting input / output signal lines from the back side to the front side of a conventional housing. 1 ... subrack 2 ... side panel 3 ... upper flange 4 ... lower flange 5 ... motherboard 6 ... guide rail 7 ... printed wiring board 8 ... frame 9 ... wiring duct 10 ... … Fixing screw

Claims (1)

(57) [Claims] 1. A printed circuit board storage sub-rack (hereinafter referred to as a sub-rack) having a printed circuit board housed therein, wired on the front side, and having a motherboard attached to a rear portion thereof. In a printed wiring board storage device comprising a housing to be arranged and mounted,
A flange formed in a direction orthogonal to the storage direction of the printed wiring board is provided on each of the upper surface and the lower surface of the subrack at a substantially central portion in the depth direction, and the depth of the housing is made deeper than the depth of the subrack. When mounting black, a space is formed between the front of the subrack and both sides of the housing, and the portion of the space located between the subrackes passes through the subrack side from the rear of the housing and the connector side of the printed wiring board front A printed wiring board storage device, further comprising a wiring duct for storing the signal lines routed to the printed wiring board.