JPS60245298A - Printed board containing device - 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 Field of the Invention The present invention relates to a printed circuit board accommodating device for accommodating printed circuit boards and the like in electronic equipment and the like.

In recent years, with the rapid technological development of electronic components such as ICs and LSIs in computers, their peripherals, and telephone exchange equipment, the frames (hereinafter referred to as shelves) and casings used to assemble these components into systems have also become smaller. demand for lower prices has become stronger. At the same time, in order to increase the competitiveness of the system, more stable and highly reliable mounting is required. . The configuration of this conventional example will be explained below with reference to FIG. 1.

In FIG. 1, 1 is a shelf, and 3 and 2 are backboards having guide rails 1a with concave cross sections on the top and bottom surfaces, which are attached to the shelf 1 with screws or the like. 3
is a card edge connector, which is integrated with the backboard 2 by solder dip. This is a printed circuit board with four various circuits formed on it. The printed circuit board 4 advances in the direction of the arrow, the thickness of the printed circuit board 4 is guided by the concave groove of the guide rail 1a, and the printed circuit board 4 is inserted and connected to a predetermined card edge connector 3. Similarly, several other printed circuit boards are also mounted, and the respective printed circuit boards are electrically connected to each other via the card edge connector 3 and the backboard 2 in the form of two electrical circuits.

The explanation so far is about the 1st shelf,
In fact, depending on the scale of the stem, a shelf like this is divided into several levels above and below and arranged in the housing.

It is stored in the straddle.

In this case, the following problems may arise.

The backboard 2 has quite a number of conductive foil patterns for transferring signals between printed circuit boards.
It also has a high weight in terms of cost. Therefore, there is a limit to cost reduction if one backboard is provided for one shelf, and furthermore, even higher density packaging cannot be expected by simply stacking shelves of this kind.

Next, regarding the card edge connector 3, conventionally it was attached using a solder dip, which caused various problems. For example, contact failure of card edge connector due to blacks rising during solder dip,
These include bridging between patterns, pattern short-circuiting due to thermal stress, and disconnection.

As described above, the conventional printed circuit board accommodating apparatus has many drawbacks as shown above, and has been a major hindrance to the production process.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional example, and aims to reduce costs and improve quality through high-density packaging.

Structure of the Invention In order to achieve the above object, the present invention makes one backboard compatible with two shelves' worth of printed circuit boards, eliminates the half-dip mounting method for card edge connectors, and replaces it with a press-fit or pressure-welding method. The card edge connector is used to achieve low cost, high quality, and high density mounting.

DESCRIPTION OF EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of the printed circuit board storage device of the present invention, in which 1 is a shelf, and 1a is a guide rail having a resin groove for guiding the printed circuit board 4, which is fixed to the shelf 1 with screws or the like. There is.

Reference numeral 3 denotes a card edge connector that is attached to the backboard 2 by press-fitting or pressure-welding.

As can be seen from FIG. 2, the 7-elf of the present invention is one in which the two shelves shown in the conventional example are integrally formed into one shelf so as to form a pair at the front and rear.

The backboard 2 is equipped with card edge connectors 3 on the front and back screens, the details of which are shown in FIGS. 3 and 4.

FIG. 3 is a perspective view of the backboard portion, and FIG. 4 is a cross-sectional view of the assembled shelf.

In FIG. 3, a plurality of card edge connectors 3 are attached on the left and right sides of the backboard 2, as shown by solid lines. On the other hand, a card edge connector 3 is attached to the back side of the backboard 2 in the same manner, but the positions are slightly shifted to the left and right so that the card edge connectors on both the front and back sides do not overlap. 5 is a screw terminal for power supply,
Like the card edge connector 3 described above, it is attached to the backboard 2 by press-fitting or pressure-contacting. Reference numeral 6 denotes a power supply line, which is connected to the backboard 2 by screws 7. The board assembled in this way (Tsuku board 2 is the 4th
It is assembled into the shelf as shown in the figure, and the entire shelf is completed.

The shelf 1 has a front mounting hole ζ-8 for fixing the guide rail 1a and the board 2, and a rear mounting hole 9 for fixing the guide rail, which are integrated by screws or welding. has been done. 10 is a board fixing screw, which is fixed only to the front mounting bar 8.

If you insert the printed circuit board 4 into the shelf completed in this way and try to connect it to the card edge connector 3, excessive stress will be applied to the backboard 2, but it is usually a press-fit connector. When using this, there is no problem because a high-strength material such as glass epoxy is used and the base material is thick.

Next, the press-fitting and press-connecting method of the card edge connector 3 and the power supply terminal 5 will be briefly explained.

Figure 5 shows how the card edge connector 3 is attached to the board 2. 3a is a contact piece that is integrally fixed to the card edge connector 3, and the printed circuit board (trI circuit board + fj, It has a contact part 3b that makes contact with the backboard 2, and a pressure contact part 3C that makes a connection with the backboard 2.The pressure contact part 3C has a shape that gives elasticity to the metal, and is slightly larger than the hole diameter of the through hole hole 2a of the backboard 2. The purpose is to securely make contact by press-fitting the terminal into the bank board 2 by pressing it into the bank board 2.The screw terminal 5 for power supply also has a similar connection structure although the shape is different. Effects The present invention has the above-mentioned configuration, and the following effects can be obtained.

(,) Traditional shelves have separate backboards,
The system was configured by stacking these shelves, but in the storage device of the present invention, the backboards of multiple shelves can be shared by one sheet, making it possible to achieve a low-cost design and increase packaging density.

(Hitoshi) When attaching card edge connectors to both the front and back sides of a backboard using the conventional solder dip method, the front side can be soldered automatically, but the back side must be soldered entirely by hand.

Moreover, the number of soldering points was considerable, the work time increased, and soldering defects frequently occurred, making it impossible to realize this method. In the present invention, since a solderless connection card edge connector and a T source supply terminal are adopted for the backboard, assembly can be performed automatically or semi-automatically with a constant quality using a relatively simple press machine, and rational mounting is possible. realizable.

(C) By eliminating all solder tip construction methods from the bank board, there are no short circuits in the conductive foil pattern due to heat stress, no warpage due to cutting, and no contact failures due to flux buildup, ensuring stable equipment operation even after delivery to the user. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a conventional printed circuit board storage device, FIG. 2 is a perspective view of a printed circuit board storage device according to an embodiment of the present invention, and FIG. 3 is a mounting diagram of the backboard of the same device. FIG. 4 is a cross-sectional view of the assembled shelf, and FIG. 5 is a diagram showing the schematic structure of the cart edge connector adopted in the present invention. 1...Shelf, 2...Backboard,
3...Card edge connector, 4...Printed circuit board, 8...Front spray bar, 9...
Rear mounting bar. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Mechanical pressure contact card edge connectors and power supply terminals are formed on both the front and back sides of a backboard that electrically connects a plurality of printed circuit boards, and a front frame body and a rear frame are formed on each of the front and back sides of the backboard. A printed circuit board storage device characterized by having a body integrally constructed symmetrically in the front and back.