JPH03222399A - shelf structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] The purpose of this invention is to provide a shelf structure for electronic devices that optimizes the mounting efficiency and cooling efficiency of printed circuit boards. Boards are stored like a bookshelf, interconnected by plug-in connection to the backboard of a multilayer printed wiring board on the back, and air-cooled shelves that ventilate vertically. , a female rail with a concave cross section is formed by fixing the backing member, and the mountings provided at a predetermined pitch in the left and right direction are installed in a bridging manner at the front and back of the upper and lower parts of the shelf at designated positions.
The device is configured to include means for arranging male rails that engage with the female rails in parallel to each other and facing each other.

[Industrial application field]

The present invention relates to a printed board storage shelf structure for an electronic device.

For electronic devices, the printed board mounting method, in which printed boards with a standardized external shape are densely mounted in the shape of a bookshelf, promotes the miniaturization and high performance of devices. High-density packaging is extremely difficult to achieve, and there is an increasing demand for high performance and miniaturization.

However, heat generation associated with high-density packaging is a problem, and reliability will be compromised if components cannot be cooled properly. The air cooling method requires space to improve the cooling effect, and it is required to improve the cooling effect without lowering the packaging density.

[Conventional technology]

FIG. 3 shows an example of a conventional shelf configuration.

As shown in FIG. 3, the structure of a conventional shelf includes grooves 57 provided on the upper and lower front edges 56 of the shelf 55 facing each other at a predetermined pitch, and grooves 57 provided on the top and bottom plates at the same pitch. The cut end of the elongated ventilation hole 58 for cooling is
A female rail 45 of a concave guide formed by bending is provided, and a backboard of a printed wiring board on which a connector (not shown) is disposed is attached to the entire rear surface.

The printed circuit board 15 has parallel opposing edges 2 forming the outer contour of the printed circuit board 57 in the groove 57 of the shelf 55 and then in the female rail 4.
5, slide it in and connect it to the connector on the backboard.

At this time, the predetermined pitch at which the female rails 45 and the grooves 57 are provided is standardized according to the minimum width of the printed board 15, and the upper and lower ventilation holes 58 are also provided in the same manner.

[Problem to be solved by the invention]

However, (1) Due to the miniaturization of electronic devices and high-density packaging due to the miniaturization of components, the amount of heat generated by the devices is increasing.

■Also, even if the printed boards 15 have the same external dimensions, the amount of heat generated varies; however, the printed boards 15 with a large amount of heat may be mounted closely on the shelf 55 depending on the external shape, or the printed boards 15 with a large amount of heat may be
It is mounted with a cooling space equal to the pitch.

■ As a result, cooling may not be sufficient in some areas, and air cooling may need to be strengthened, or the cooling space may need at least one pitch.
This inevitably results in waste that lowers the mounting efficiency of the shelf 55.

There are other problems.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a shelf structure that optimizes printed board mounting efficiency and cooling efficiency.

[Means to solve the problem]

As shown in Fig. 1, the above purpose is to store a printed board 1 having a plurality of circuits in the form of a bookshelf, connect it to the back board 8 of the multilayer printed wiring board on the back side by plug-in, and connect it to each other in the vertical direction. In the air-cooled shelf 5 for ventilation, a support member 3 is fixed to the parallel upper and lower edges 2 of the printed board 1 to be slid in to form a female rail 4 having a concave cross section. The present invention comprises means for arranging male rails 7 that engage with the female rails 4 in parallel to each other at specified positions in a bridging manner at a predetermined pitch in the left and right direction. This is achieved by the shelf structure.

[For production]

That is, the basic principle of optimization is to distribute the space occupied on the shelf according to the amount of heat generated, rather than densely mounting the printed circuit board based only on its external shape.

In the present invention, the space occupied by each printed circuit board 1 within the shelf 5 can be distributed at predetermined pitches, and by making this pitch as small as possible, it is possible to eliminate unnecessary space.

Furthermore, in order to improve the cooling effect, the resistance of the cooling air in and out is lowered.

The shelf 5 does not have ventilation holes at each pitch as in the conventional example described above, but has male rails 7 arranged in a bridging manner at the front and back of the upper and lower parts of the shelf 5, and Provided only at the mounting position. As a result, since the rail is of a male type, its cross section in the vertical direction is small, so that resistance is low, and only the minimum necessary strength members are provided in other parts, so that there is no obstacle to ventilation.

Thus, it is possible to provide a shelf structure that optimizes printed board mounting efficiency and cooling efficiency.

〔Example〕

The present invention will be specifically described below with reference to embodiments shown in the drawings. The same reference numerals indicate the same objects throughout the figures. FIG. 1 shows a configuration diagram of one embodiment of the present invention, and FIG. 2 shows a female rail of another embodiment of the present invention.

In one embodiment, as shown in FIG. 1, the shelf 5 has external dimensions of 15 height x 45 width x 20 CTI+ depth.

The printed board l slides in along the upper and lower edges 2,
A support member 3 made of a thin aluminum strip having a thickness of 1I [1II] is applied to both sides, and fixed with rivets so that the edge protrudes by 4 mm to form a female rail 4 with a concave cross section.

The shelf 5 includes a front frame 61 facing vertically at the front, a rear frame 62 facing vertically at the rear, and a plug-in connector 81.
It consists of a backboard 8 made of a multilayer printed wiring board to which is attached, left and right side plates 63, and a male rail 7.

The front frame 61 is a die-cast aluminum alloy product with comb teeth 64 formed at a pitch of 2.54 mm on the rear edge.

The rear frame 62 is an extruded square piece of aluminum alloy.

The male rail 7 is made of a 1.2-inch thick iron strip, and the front part has a bent surface 71 bent into a cross-sectional shape, the tip part 72 is cut out and has only a vertical surface, and the rear end is a vertical surface. It is bent to form a fixing surface 73 with a threaded hole 74, and its intermediate portion is reinforced in the longitudinal direction by folding back the edges.

The front part of this male rail 7 has comb teeth 64 on the rear edge of the front frame 61.
If the front frame 61 is inserted into the groove 65 so that the tip 72 is on the inside opposite to the upper and lower sides, the tip 72 and the bent surface 71 will engage to sandwich the insertion part of the front frame 61, and will not come out backwards. It is fixed so that it will not come off. Thereafter, the rear fixing surface 73 comes into contact with the backboard 8, so it is screwed into the fixing position provided on the backboard 8.

As a result, the male rails 7 can be easily and precisely arranged at specified positions with a pitch of 2.54 mm, and reliably without coming off.

In another embodiment, as shown in FIG. 2, the female rail 41 on the edge 2 of the printed circuit board 11 is fixed with rivets so as to straddle the edge 2 using an aluminum die-casting member 31 with an H-shaped cross section. Compared to the one of the embodiment described above, the frictional force between the shelf 5 and the male rail 7 is reduced, and positioning and mounting can be performed with higher precision. Furthermore, even if the printed boards 11 have different thicknesses, the male rails 7 of the shelf 5 may be fixed by sandwiching spacers of different thicknesses to the riveted portions of the backing members 31 of the printed boards 11, or if the thickness is different. In this case, apply member 3
This can be addressed by changing the straddle spacing of 1 to a wider one.

The above embodiments are merely examples, and the shapes, dimensions, and materials of each part are not limited to those described above.

For example, the rear part of the male rail 7 is fixed to the backboard 8.
The rear frame 62 is also provided with comb teeth 64 corresponding to the front frame 61, and the male rail 7 is warped to shorten the overall length. It is also possible to fit into the grooves 65 of the comb teeth 64 of the frame 61 and the rear frame 62.

Further, the shape of the groove of the comb teeth may be widened on the outside so that the male rail 7 can be easily inserted.

[Effects of the Invention] As described above, by using the shelf structure of the present invention, it is possible to optimize the mounting efficiency and cooling efficiency of the printed board, furthermore, it is possible to reinforce the printed board, and it is possible to reduce the difference in the thickness of the printed board. It has a structure that can be easily absorbed, and can be an effective means for dealing with increasingly high-density packaging in the future, and its effects are remarkable.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 2 shows a female rail of another embodiment of the invention, and FIG. 3 shows a shelf configuration of a conventional example. In the figure, 1.11.15 is a printed board, 3.31 is a support member, 5.55 is a shelf, 8 is a backboard, 57.65 is a groove, 61 is a front frame, 63 is a side plate, 71 is a folding surface , 73 is a fixing surface, and 81 is a connector. 2 is the edge, 4, 41, 45 is the female rail, 7 is the male rail, 56 is the front edge, 58 is the ventilation hole, 62 is the rear frame, 64 is the comb tooth, 72 is the tip, 74 is the screw hole , This 7-note V material 31

Claims (1)

[Claims] A printed circuit board (1) having a plurality of circuits is housed in a bookshelf shape, and is connected to a back board (8) of a printed wiring board on the rear side by plug-in to connect them to each other, and to ventilate the circuits in the vertical direction. In the air-cooled shelf (5), a support member (
3) is fixed to form a female rail (4) with a concave cross section, and installed at specified mounting positions provided at a predetermined pitch in the left and right direction in a bridging manner at the front and back of the upper and lower parts of the shelf (5). , a male rail (7) that engages the female rail (4).
A shelf structure characterized by comprising a means for arranging the two oppositely and parallelly.