JPH01140700A - Wiring structure of backboard printed board - Google Patents

Abstract

PURPOSE:To facilitate wiring operation while improving reliability of wiring construction, by mounting a flexible printed board on the rear face of a printed backboard. CONSTITUTION:A flexible printed board 10 is positioned on the rear face of a printed backboard 5 with the shorter sides 10b of the board 10 being curved. Backboard pins 6 corresponding to a selected pair of connectors are inserted through through holes 11 and they interlock with each other by elasticity of the flexible printed board 10, so that the selected backboard pins 6 are connected with each other through a conductor pattern 12. In this manner, wiring construction of the printed backboard with high reliability can be obtained by easy wiring operation.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a backboard printed board of a printed board device that accommodates a large number of printed boards, and in particular regarding its wiring structure, a backboard print that facilitates wiring work and has high wiring reliability. In a printed board device that is equipped with a backboard printed board on the back side of a box-shaped case with an open front to accommodate a large number of printed boards in parallel, the purpose is to provide a board wiring structure. A backboard comprising a large number of connectors arranged on the surface of the backboard printed board and selected terminals of the connector cover extending to protrude a desired amount from the backside of the backboard printed board in order to insert the printed board. The board pin and the through holes are arranged in parallel along both long sides at the desired pitch, and the selected pair of through holes are
and a flexible printed board connected to each other by a conductive pattern, and with the short side of the flexible printed board curved, the through hole is formed in each of the corresponding backboard pins of the selected pair of connectors. The selected backboard pins are connected via the conductor pattern by being inserted and engaged by the elasticity of the flexible printed board.

[Industrial Field of Application] The present invention relates to a backboard printed board of a printed board device that accommodates a large number of printed boards, and particularly to its wiring structure.

2. Description of the Related Art Printed board devices such as the one shown in FIG. 3, in which a large number of printed boards are housed in parallel in a housing, are widely used in recent electronic devices.

In FIG. 3, a box-shaped housing 1 made of a metal plate and having an open front is provided with a large number of opposing guide grooves (not shown) on the upper and lower plates, respectively.

Attach the backboard printed board 5 to the back of the housing 1,
On the surface of the backboard printed board 5 (inner surface of the housing),
Connectors 4 are arranged corresponding to each guide groove.

A printed board connector 3 is mounted on each printed board 2, and the upper and lower side edges of the printed board 2 are inserted into the guide grooves as guides, and the printed board 2 is pushed into the housing 1, and the printed board connector 3 is inserted into the guide groove. The printed circuit boards 2 are installed in the housing 1 in parallel by inserting them into the corresponding connectors 4.

Then, the printed circuit boards are connected to each other through a conductor pattern provided on the backboard printed board 5.

In recent years, there has been a demand for high-density mounting of components on the printed circuit board 2, and this has led to a significant increase in the number of contacts of the printed temporary connector 3, that is, the number of terminals of the connector 4.

For the reasons mentioned above, the number of conductor patterns required by the backboard printed board 5 has increased significantly, and the number of layers of the backboard printed board is progressing.

On the other hand, as the number of layers of a printed wiring board increases, the manufacturing cost generally increases rapidly. For this reason, there is a demand for a low-cost backboard printer 1 with a small number of layers.

[Prior Art] FIG. 4 is a perspective view of a conventional example, in which a large number of connectors 4-1.4-2.4- are provided on the surface (lower surface in FIG. 4) of the backboard print 1-board 5. 3. ......-... are installed in parallel.

The terminals of each connector protruding from the back side of the connector housing pass through through holes in the backboard printed board 5, are soldered on the backside, and are connected to selected conductor patterns on the backboard printed board 5. It is composed of

For example, between adjacent connectors, connector 4-
1 and connector 4-2, connector 4-2 and connector 4-3
The connection between them is made through a conductor pattern provided on a conductive layer of the backboard printed board 5.

Also, connection with a distant connector, for example connector 4-1
The connection between the connector 4-3 and the connector 4-3 is achieved by making the corresponding terminal of the connector protrude as long as desired from the back surface of the backboard printed board 5 to form a backboard pin 6, and connecting the corresponding backboard pin 6 with an insulated wire 7, for example, The PVC jumper wires are wrapped and connected to make them conductive.

In this way, the number of conductor patterns in the backboard printed board 5 can be reduced by making the terminals of the desired connector protrude from the back side to serve as the backboard pins 6, and connecting them on the back side of the backboard printed board 5 using insulated wires. That is, the number of layers is reduced to reduce the cost of the backboard printed board.

[Problem that the invention seeks to solve]

However, the wiring structure of the backboard printed board of the above-mentioned conventional example is such that the bankboard pins 6 and the insulated wires 7 to be connected are
Since the wires must be connected by wrapping or soldering, the wiring work is troublesome and requires a lot of time.

Further, there is a problem in that the backboard bins 6 to be connected are mistakenly connected as being adjacent, or connections are missed, resulting in low wiring reliability.

The present invention was created in view of the above points, and an object of the present invention is to provide a wiring structure for a backboard printed board that allows easy wiring work and has high wiring reliability.

[Means for solving problems]

In order to solve the above problems, the present invention has a configuration in which a backboard printed board 5 is attached to the back side of a box-shaped case with an open front, and a large number of printed boards are attached to the case in parallel. In the printed board device, the first or second
As illustrated in the figure, connectors 4-1, 4-2, and 4-2.
4-3. −・−・−・ are arranged on the front side of the backboard printed board 5.

Terminals provided at corresponding positions of the respective connectors are selected and projected by a desired amount from the back surface of the backboard printed board 5 to form backboard bins 6.

On the other hand, the through holes 11 are arranged in parallel at a desired pitch along both long sides 10a, and the selected pair of through holes 11
However, flexible printed circuits 10 each connected by a conductor pattern 12 are provided.

Then, with the short side 10b of the flexible printed board 10 curved, the flexible printed board 10 is aligned with the back surface of the backboard printed board 5, and each of the corresponding backboard pins 6 of the selected pair of connectors is Through-holes 11 are inserted into the backboard bins 11 and the flexible printed board 10 is elastically engaged to connect the selected backboard bins 6 to each other via the conductor pattern 12.

[Effect]

The through holes 11 of the flexible printed board 10 of the present invention are formed by flexible printed W7. lOO long side 10
Along the line a, adjacent through holes 11 are arranged at a predetermined pitch, facing both side edges.

Therefore, as shown in FIG. 1, when a pair of opposing through holes 11 are connected by a conductor pattern 12, the short side 10b is curved in an arcuate shape, and the length of the string is The pitch is equal to the pitch of the backboard bins 6.

In this way, even when the through holes 11 are curved into an arched shape, the pitches of the through holes 11 do not change, and they are arranged in two parallel rows.

In addition, as shown in FIG. 2, when through holes 110 arranged on the same long side 100a are connected by a conductive pattern 120, the through holes 110 facing on the short side 100b are overlapped. The short side 100b is used by being curved into an elliptical shape.

When curved into an elliptical shape in this way, all the through holes 110 are aligned on the same straight line and are equal to the pitch of the backboard bins 6 to be connected.

On the other hand, the pair of backboard pins 6 to be connected are the extensions of the terminals at corresponding positions of the respective connectors, so they are on the Y-axis of the backboard print 1-5 or on a straight line parallel to the Y-axis. , its pitch is constant.

Therefore, when the through holes 11 near both ends of the flexible printed board 10 are fitted into the corresponding backboard pins 6, all the other through holes 11 are easily fitted into the corresponding backboard pins 6.

In addition, there is no possibility that the backboard bin 6 will be inserted into another backboard bin 6 other than the predetermined one.

That is, there is no risk of connection to adjacent backboard pins or connection leakage, and the reliability of the wiring is high.

In addition, since the flexible printed board 10 is curved as desired and attached to the backboard printed board 5, elasticity that tries to restore the flexible printed board 10 acts on the flexible printed board 10, and the through holes 11 are engaged with the backboard pins 6. do. Therefore, the conductor pattern 12 and the backboard bin 6
It will be in a connected state, and there is no possibility of it being disconnected.

That is, the wiring work is extremely simple.

〔Example〕

The present invention will be specifically described below with reference to the drawings. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 1 is a configuration diagram of an embodiment of the present invention, in which (a) is a perspective view of a flexible printed board, (b) is a perspective view of the attached state, and (C) is a sectional view of the main part. The figures are configuration diagrams of other embodiments of the present invention, in which (a) is a plan view of the flexible printed board, and (b) is a perspective view of the flexible printed board in the mounted state.

In FIG. 1, reference numeral 10 is a strip-shaped flexible printed board in which conductive patterns 12 are provided in parallel on the surface of a thin, elastic base material such as polyimide.

The width of the flexible printed board 10, that is, the length of the short side 10b, is preferably longer than an integral multiple of the arrangement pitch of the connectors 4-1, 4-2, and 4-3 arranged on the surface of the backboard print vi5, for example. It is a predetermined width such as 1.5 times or 2.5 plates. In the illustrated embodiment, since the backboard bins of the connectors arranged every other connector are connected, the short side 10
The length of b is set to 2.5 times.

As shown in detail in FIG. 1(a), the flexible printed board 10 has through holes 11 arranged in two rows at a desired pitch along each of the two opposing long sides 10λ. The desired pitch refers to the arrangement pitch of adjacent terminals of the same connector.

A pair of opposing through holes 11 are connected by conductor patterns 12, respectively.

Reference numeral 5 denotes a backboard printed board 5° that is attached to the back side of a box-shaped case (not shown) with an open front side of the printed board device, as shown in FIGS. 1(b) and (C). like,
On the surface (lower surface in FIG. 1) of the backboard printed board 5, there are many connectors 4-1.4-2.4-3゜----
----- are installed in parallel.

The terminals protruding from the back side of the connector housing of each connector pass through the through holes of the backboard printed board 5, are soldered on the back side, and are connected to the selected conductor pattern on the backboard printed board 50. It is configured.

For example, between adjacent connectors, connector 4-
1 and connector 4-2, connector 4-2 and connector 4-
3 are connected via a conductor pattern provided on a conductive layer of the backboard printed board 5.

Also, connection with a distant connector, for example connector 4-1
The connector 4-3 is connected to the backboard pin 6 by making the corresponding terminal of the connector protrude as long as desired from the back surface of the backboard printed board 5. Note that terminals that do not require connection on the flexible printed board 10 are cut off on the back side of the backboard printed board 5.

The short side 10b of the flexible printed board 10 is curved into an arched shape so that the length of the chord is equal to the arrangement pitch of the connectors 4-1 and 4-3.

Then, the through holes 11 arranged in one row are inserted into the corresponding backboard pins 6 of the connector 4-1, and the through holes 11 arranged in the other row are inserted into the corresponding backboard pins 6 of the connector 4-3.
It is inserted into the corresponding backboard pin 6.

As described above, since the flexible printed board 10 is curved as desired and attached to the backboard printed board 5, elasticity is applied to the flexible printed board 10 to restore its original shape.

Therefore, the through holes 11 engage the backboard pins 6, and each pair of backboard pins 6 to be connected are connected via the respective conductor patterns 12.

Also, each backboard pin 6 and through hole 1
1 is attached to the flexible printed board 10.
There is little possibility that the material will be removed from the backboard printed board 5.

In order to prevent the flexible printed board 10 from being pulled out of the backboard printed board 5 due to vibrations such as earthquakes, the flexible printed board 10 is attached to the backboard printed board 5 as shown in FIG. 1(C). After mounting on the board 5, the insulating tubes 15 may be fitted onto the heads of the backboard pins 6 at both ends.

Also, all of the pair of opposing through holes 11 are connected by conductive patterns 12, but the backboard pins 6 that do not need to be connected can be cut at the back side of the backboard printed board 5. Therefore, there is no risk of unnecessary short circuits.

As mentioned above, the terminals of the desired connector are made to protrude from the back side to serve as the backboard pins 6, and the flexible printed board I
Since the connection is made on the back side of the backboard printed board 5 using O, the number of conductor patterns in the backboard printed board 5, that is, the number of layers, can be reduced, and the cost of the backboard printed board 5 is low. .

In FIG. 2, reference numeral 100 is a narrow tape-shaped flexible printed board in which a conductor pattern 120 is provided as desired on the surface of a thin, elastic base material such as polyimide.

The width of the flexible printed board 100, ie, the length of the short side 10b, is not particularly limited.

The flexible printed board 100 has through holes 110 arranged in two rows at a desired pitch along each of the two opposing long sides 10a. What is the desired pitch?
Refers to the arrangement pitch of adjacent connectors.

Through holes 1101 arranged on one long side 100a side
1. , are connected to each other by a short conductor pattern 120. Also, through holes 110 arranged on the other long side 100a side
Also, every other short conductor pattern 12 is shifted one by one.
Connected with 0.

The short side 100b is curved into an oval shape so that the through holes 110 facing the short side 100b overlap, and the flexible printed board 100 is aligned with the back surface of the backboard printed board 5, and the overlapping through holes 110 are The connectors 4-1, 4-2, 4-3, and the like are inserted into corresponding backboard pins 6, respectively.

Therefore, corresponding terminals of connector 4-1 and connector 4-3, connector 4-2 and connector 4-4 (not shown)
Corresponding terminals are connected via conductive patterns 120, respectively.

As mentioned above, since the flexible printed board 100 is curved into an oval shape and attached to the backboard printed board 5, it has a stronger resilience to recover than the one shown in FIG. Due to vibrations such as earthquakes, etc.
There is no possibility that the flexible printed board 100 will be removed from the backboard printed board 5.

Moreover, the structure shown in FIG. 2 is extremely convenient for connecting terminals of connectors located at separate locations by elongating the conductor pattern 120.

[Effects of the Invention] As explained above, the present invention provides a wiring structure for a backboard printed board in which a flexible printed board is attached to the back side of the backboard printed board 5, and the wiring structure is such that a flexible printed board is attached to the back side of the backboard printed board 5. Since the number of flexible printed boards is small, the cost is not only low, but also the wiring work is easy and the reliability of the wiring is high, which has excellent practical effects.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of an embodiment of the present invention, (a) is a perspective view of the flexible printed board, (b) is a perspective view of the attached state, (C) is a sectional view of the main part, and Figure 2 is the main part. 4 is a block diagram of another embodiment of the invention, (a) is a plan view of the flexible printed board, (b) is a perspective view of the attached state, FIG. 3 is a partially cutaway perspective view of the printed board device, and FIG. is a perspective view of a conventional example. In the figure, 1 is a housing, 2 is a printed board, 4.4-1.4-2.4-3 is a connector, 5 is a backboard printed board, 6 is a backboard pin, 10 and 100 are flexible printed boards, 10a,
1QOa is the long side, 10b and 100b are the short sides, 11 and 110 are through holes, and 12 and 120 are conductor patterns. Fu I/kisibunmufuruto shuto, f + sai p, cause (no child ## divided prisoner (C) Jiko = 7 pu ≦ G million I C roi and female 9) pu bag millet η mortar +l Csu 4J Kyutun Tokomi bmo 4$ 2 Figure

Claims (1)

[Claims] In order to accommodate a large number of printed boards in parallel, a backboard printed board (5) is provided on the back side of a box-shaped case with an open front.
In a printed board device equipped with a plurality of connectors (4) arranged on the surface of the backboard printed board (5) in order to insert the printed board, and selected terminals of the connectors (4) are extended. Then, on the back surface of the backboard printed board (5), backboard pins (6) protruding by a desired amount and through holes (11) are arranged in parallel at a desired pitch along both long sides (10a), Selected pair of through holes (11
) is provided with flexible printed boards (10) connected to each other by conductor patterns (12), and with the short side (10b) of the flexible printed board (10) curved, the selected pair of connectors (4) to each of the corresponding backboard pins (6).
11) is inserted and engaged by the elasticity of the flexible printed board (10), and the selected backboard pin (6
) A wiring structure of a backboard printed board, characterized in that the wiring structure is configured such that the interconnections are connected to each other via the conductor pattern (12).