JPH0497596A - Fixing structure of backboard of electronic apparatus - Google Patents

Abstract

PURPOSE:To increase the quantity of the patterns in X direction, which can be stored in a backboard, by using a slit with a narrow width for inserting a fixing metal fitting. CONSTITUTION:The length and the width of a slit 14 are set to be respectively a little wider than the width w and the thickness t of a fixing metal fitting 11. A reinforcing metal fitting 10 is positioned through an insulating plate 15 on a backboard 1, and a cut part 12 and a slit 14 are made to correspond to each other. A metal fitting 11 is inserted into the slit 14 from the free end, and the front wall 11a is inserted in the cut part 12 through the board 1, and the rear wall 11b is exposed at the rear of the board 1. When press spring 17 is screwed in the screw hole 13 at the front wall 11a from the front side of the cut part 12, and the inwall of the metal fitting 10 is pressed with the top, the distance between the rear wall 11b and the board 1 shortens, and a plate 16 is pressed to the rear of the board. The metal fitting 10 is fixed to the board 1 in sandwiches shape by the front and rear walls 11a and 11b.

Description

[Detailed Description of the Invention] [Summary] In an electronic device configured by mounting a large number of electronic circuit pancages in a frame, a package is installed on the back side of the frame for an interface between the electronic circuit packages. Regarding the common backboard fixing structure, the aim is to provide a backboard fixing structure that does not substantially reduce the area for accommodating wiring patterns on the backboard, and a large number of electronic circuit packages are mounted in a frame. A common backboard fixing structure that is screwed and fixed to the back side of the frame for an interface between the electronic circuit packages, wherein both upper and lower edge areas of the backboard In addition, a horizontal reinforcing metal fitting having a hollow square cross section with a notch in a predetermined pin hole is installed across the front wall in the central area, except for both ends which are fixed with screws. A horizontally long slit having a width corresponding to the notch is provided on the backboard immediately below the notch of the reinforcing metal fitting, and a fixing metal fitting having a U-shaped cross section having a width corresponding to the notch is attached to the backboard. The backboard is inserted through the slit, and the front wall forming the U-shape of the fixing bracket is accommodated in the notch, and the rear wall is positioned behind the backboard, and the A push screw is screwed into the screw hole, and its tip presses the reinforcing metal fitting against the backboard, and the reinforcing metal fitting is clamped and fixed between the back wall of the fixing metal fitting.

[Industrial Field of Application] The present invention relates to an electronic device configured by mounting a large number of electronic circuit packages in a frame, in which the electronic circuit package is installed on the back side of the frame for an interface between the electronic circuit packages. Regarding the common backboard fixing structure.

[Conventional technology]

In recent years, electronic circuit packages have become highly densely packaged, so the connectors used are also equipped with a large number of pins, which requires a large load to insert and remove from the backboard. Accordingly, the reinforcement of the backboard is required to be stronger than before.

Moreover, as the number of wires between each electronic circuit package increases with high-density packaging, the number of circuit patterns on the backboard connected to these also increases, and securing mounting space has become a major problem.

In the conventional backboard 1, as shown in FIG. 7, reinforcing metal fittings 2 with a hollow square cross section are installed along the width direction at a total of three locations in the upper and lower regions and in the central region. Insert the screws 5 through the holes 3 in the wall of the notches provided at appropriate locations and into the round holes 4 provided at the corresponding locations on the backboard example, and screw the presser plate 6 applied to the back of the backboard 1. The reinforcing metal fittings 2 are fixed to the backboard 1 and strengthened by screwing them into the holes 7 and tightening the backboard 1 from the front and rear. Then, screw 5 on the top and bottom of the backboard.
The backboard is attached to the frame by directly screwing into a threaded hole 7 provided in the frame 8 instead of the pressing plate 6.

[Problem to be solved by the invention]

In this conventional fixing structure, in order to insert the screws 5, it is necessary to drill holes 3 at many locations on the backboard 1, and since wiring patterns cannot be provided at those locations, there is no substantial pattern. There was a drawback that the storage area was reduced. This is a big problem when dealing with high-density packaging.

An object of the present invention is to solve the problems in the prior art and to provide a backboard fixing structure that does not substantially reduce the wiring pattern accommodation area on the backboard.

[Means to solve the problem]

The purpose of this is to provide a common backboard that is screwed and fixed to the back side of the frame for the interface between each of the electronic circuit packages in an electronic device configured with a large number of electronic circuit packages mounted in a frame. In the fixing structure, horizontal reinforcing metal fittings having a hollow rectangular cross section and having cutouts at a predetermined pitch are installed across the front wall in both upper and lower edge areas and in the center area of the backboard. ,
A horizontally long slit having a width corresponding to the notch is provided on the backboard immediately below the notch of the reinforcing metal fittings, except for both ends to be fixed with screws, and A fixing fitting having a U-shaped cross section is inserted into the backboard through the slit, and a front wall forming the U-shape of the fixing fitting is accommodated in the notch,
After that, position the wall behind the hack board, screw a push screw into the screw hole provided in the front wall of the fixing metal fitting, and press the reinforcing metal fitting against the backboard with its tip,
This is achieved by a backboard fixing structure characterized in that the backboard is clamped and fixed between the fixing fittings and the rear wall.

[For production]

The backboard is screwed and fixed to the frame at both ends along with reinforcing metal fittings having notches provided at a predetermined pitch by screws passing through the backboard. but,
In the other intermediate region, there is no perforation passing through the backboard, but instead a slit is provided corresponding to the notch.

In order to fix the reinforcing metal fittings to the backboard, the fixing metal fittings having a U-shaped cross section are housed in the notches of the fixing metal fittings, the backboard is penetrated through the slit, and the backboard is secured with the front and rear walls forming the U shape. Position the board so that it is sandwiched between them. Then, a push screw is screwed into the screw hole provided in the front wall of the fixing metal fitting, and the tip of the screw presses the reinforcing metal fitting against the backboard, and the backboard is sandwiched between the back wall of the fixing metal fitting. and fix it.

According to the present invention, the screws are screwed through the backboard only at both ends, which have little utility as storage areas for wiring patterns, and in the central area of the backboard where many patterns are arranged. Since it is only necessary to provide a slit thin enough to pass through the plate thickness of the fixing metal fitting,
It becomes possible to effectively utilize the entire area of the backboard.

Hereinafter, the present invention will be explained in more detail based on preferred embodiments shown in the drawings.

〔Example〕

FIG. 1 shows a rear view of a backboard with the fixing structure of the present invention.

Three reinforcing metal fittings 10 are attached to the upper and lower edges of the backboard 1 and in the middle thereof, extending across the width direction. As with the conventional structure shown in FIG. It is fixed by screwing it into 7.

A feature of the present invention is the fixing structure of the other parts except for these through screw parts, which are comprised of the reinforcing metal fittings 10 and the fixing metal fittings 11.

The reinforcing metal fitting 10, as shown in FIGS. 2 and 3,
It is a hollow horizontal member made of sheet metal with a square cross section, and cutouts 12 are provided at predetermined intervals on the front surface of the member, corresponding to the fixing points to the backboard.

As shown in FIG. 4, the fixing fitting 11 is a small piece of sheet metal having a U-shaped cross section with a width W slightly narrower than the width a of the notch 12, and constitutes one side of the U-shape. A punch hole 13 is provided in the front wall 11a.

As shown in FIG. 5, on the backboard 1, there is a horizontally elongated strip along the bottom wall 10a of the reinforcing metal fitting 10, at a position corresponding to the notch 12 when the reinforcing metal fitting 10 is attached. A slit 14 is provided. This slit 1
The length 1 and the groove width d of 4 are set to be slightly wider than the width W and plate thickness t of the fixing metal fitting 11, respectively. In addition, the circle indicated by a chain line in this figure indicates the round hole 4 conventionally provided for inserting a screw.

Next, the assembly procedure of this fixing structure will be explained based on FIG. 6.

A reinforcing metal fitting 10 is placed on the backboard 1 via an insulating plate 15a.
, and make the notch 12 and slit 14 correspond to each other. (Fig. 6a) Next, the fixing metal fitting 11 is inserted from its free end into the slit 14, passes through the backboard 1, and puts its front wall 11a into the notch 12, and the rear wall 11b is inserted into the backboard 1. exposed behind.

(Fig. 6b) Attach the insulating plate 15b and the flat plate 16 to the rear wall 11b of the fixture 11.
and backboard 1.

(Fig. 6C) Finally, insert the set screw 17 into the notch 12 of the reinforcing metal fitting 10.
It is screwed into the threaded hole 13 of the front wall 11a of the fixing metal fitting 11 from the front side of the metal fitting 11, and its tip presses against the inner wall of the reinforcing metal fitting 10.

This reduces the distance between the rear wall 11b of the fixture 11 and the backboard l, and the flat plate 16 is pressed against the back surface of the backboard. With this, the reinforcing metal fitting 10 is fixed to the fixing metal fitting 1.
It is fixed to the hack board l by the front and rear walls 11a and 11b of 1 in a sandwich-like manner. (Fig. 6 d) The backboard 1 strengthened by the reinforcing metal fittings in this way is screwed to the frame 8 together with both ends of the upper, middle, and lower reinforcing metal fittings, as in the conventional example shown in Fig. 7.・Fixed.

〔Effect of the invention〕

As described in detail above, according to the present invention, the round hole that was conventionally necessary for inserting screws is eliminated from the central inclined wall of the backboard, and a narrow groove width slit for inserting the fixing metal fittings is provided. , it is possible to increase the amount of patterns in the X direction (horizontal direction) that can be accommodated on the hack board. This effect is particularly remarkable in printed circuit boards with a large number of laminated boards.

[Brief explanation of drawings]

FIG. 1 is a rear view of the backboard of the present invention, and FIG. 2 is a rear view of the backboard of the present invention.
FIG. 3 is a sectional view taken along line I-1 in FIG. 2; FIG. 4 is a perspective view showing the structure of the fixing fitting of the present invention; 6a-d are cross-sectional views of a backboard showing the assembly procedure of the fixing structure of the present invention; FIG. 7 is a plan view of the backboard showing the conventional fixing structure. FIG. 1-Backboard 1〇-Reinforcing metal fittings 11-Fixing metal fittings 12-Notches 13-Screw holes 14-Slits 15a, 15b-Insulating plates 16--Flat plates 17--Press screws

Claims (1)

[Claims] 1. In an electronic device configured by mounting a large number of electronic circuit packages in a frame, there is a common backboard (screwed and fixed to the back side of the frame (8) for the interface between the electronic circuit packages). 1), in which notches (12
) A horizontal reinforcing metal fitting (10) having a hollow square cross section is installed transversely, and the back is directly below the notch (12) of the reinforcing metal fitting, except for both ends which are fixed with screws. A horizontally long slit (14) having a width corresponding to the cutout is provided on the board (1), and a fixing metal fitting (11) having a U-shaped cross section and a width corresponding to the cutout is inserted into the slit ( 14) into the backboard through
The front wall (11a) forming one side of the U-shape of the fixture is accommodated in the cutout (12), and the rear wall (11a) is accommodated in the notch (12).
1b) behind the backboard (1), and screw holes (13) provided in the front wall (11a) of the fixing fittings.
A set screw (17) is screwed into the reinforcing metal fitting (10), and its tip presses the reinforcing metal fitting (10) against the backboard (1), and the fixing metal fitting is clamped and fixed with the rear wall (11b) of the fixing metal fitting. The fixed structure of the backboard is characterized by: