JPH034068Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a printed wiring board mounting structure using a motherboard.

[Technical background of the invention and its problems]

Generally, this type of printed wiring board mounting structure mainly includes a chassis, a plurality of printed wiring boards (hereinafter referred to as PWBs) housed in the chassis, and a motherboard. Figure 1 shows such a printed wiring board mounting structure.
include PWB2 ₁ , 2 ₂ , PWB3 ₁ to 3 ₅ , and PWB
4 is mounted horizontally. In this example, PWB2
₁ , 2 ₂ are slot numbers S01, S0 of chassis 1
PWBs ₃₁ to ₃₅ are installed in slots S06 to S10, PWB4 is installed in slots S11, and slots S03 to S05 and S12 of chassis 1 are installed. It is an empty slot. Further, a motherboard 5 is attached to the side of the chassis 1 opposite to the PWB insertion side, that is, the back panel side. Figure 2 is a diagram of this motherboard 5 seen from the back side of the chassis 1, and the parts surrounded by broken lines (indicated by P ₁ , P ₂ , P ₃ ) are the memory bus, system bus, input/output. This is a wiring part of a signal bus such as a bus (hereinafter simply referred to as a signal bus). These signal buses P ₁
~ ₃ are wired independently on the motherboard 5. FIG. 3 shows an example of wiring of the signal bus _P1 . FIG. 4 is an X-Y cross-sectional view of FIG. 1, showing slot numbers S01, S02, and
Connectors 6, 6, corresponding to S06 to S10, S11...
Edge connectors 7 of PWBs _{2 1} , 2 ₂ , 3 ₁ to 3 ₅ , and 4 are inserted in the .

In such a conventional printed wiring board mounting structure, 1
If the number of input/output pins of the slot is N (N is a multiple of 2), and the number of used pins of signal buses P ₁ , P ₂ , and P ₃ are n _P1 , n _P2 , and n _{P3 ,} respectively, then n _P1 + n _P2 + n _P3 > Therefore, as shown in FIG. 2, it was necessary to wire the signal buses P ₁ , P ₂ , and P ₃ on the motherboard 5 in areas corresponding to different slot positions. In the example of Figure 2, signal bus P ₁ is connected to chassis 1.
Signal bus P 2 is wired only to the area corresponding to slot numbers S01 to S05, signal bus P ₃ is wired only to the area corresponding to slot numbers S06 to S10, and signal bus P ₃ is wired to slot numbers S11 and S12.
Wiring is done only in the area corresponding to . Therefore, the PWB that should be connected to signal bus _P1 (this is A type
(referred to as PWB) is slot number S of chassis 1.
It can be mounted only in slots 01 to S05.
Similarly, the PWB to be connected to the signal bus _P2 (this is called a B type PWB) can only be mounted in the slot numbers S06 to S10 of chassis 1, and the PWB to be connected to the signal bus _P3 (this is called a B type PWB) (referred to as C type PWB) has slot numbers S11 and S1.
It can only be installed in 2 slots. In other words, slot numbers S01 to S05 of chassis 1,
S06 to S10, S11, and S12 slots are A type PWB mounting area and B type respectively.
Fixed as PWB mounting area and C type PWB mounting area. In this case, PWB2 ₁ and 2 ₂ are A-type PWBs _{2 1} and 2 ₂ , PWBs _{3 1} to _{3 5} are B-type PWBs _{3 1} to 3 ₅ , and PWB 4 is C-type PWB 4 .

Therefore, for example, if you want to expand two or more C type PWBs, even though there are four empty slots in chassis 1 with slot numbers S03 to S05 and S12, the only slot in which a C type PWB can be mounted is slot number S12. There was an inconvenience that there was only a slot. Therefore, in order to add two or more, for example three, C-type PWBs, an expansion chassis 8 must be prepared separately from the chassis 1, as shown in FIG. In the figure, 4 ₁ to 4 ₃
is an expanded C type PWB, and 9 is a housing in which the chassis 1 and the expanded chassis 8 are mounted.

In this way, in the conventional printed wiring board mounting structure,
Even though there were more empty slots in the chassis than the number of PWBs to be expanded, it was necessary to add an expansion chassis, resulting in poor implementation efficiency. In addition, as mentioned above, since the number of input/output pins per slot is small, it is not possible to wire signal lines other than signal buses such as the memory bus, system bus, and input/output bus on the motherboard 5, and as shown in FIG. As shown, a free edge connector 10 is required on the free edge side of a PWB, for example, PWB ₃₁ , for electrically connecting it to another PWB.
For this reason, there were problems such as high costs associated with cable wiring, etc., and poor appearance.

[Purpose of invention]

This invention was made in view of the above circumstances, and its purpose is to connect PWB if there is an empty slot in the chassis.
It can be mounted freely regardless of the type of (printed wiring board),
Particularly, it is an object of the present invention to provide a printed wiring board mounting structure that improves mounting efficiency during system expansion.

[Summary of the idea]

The present invention uses a motherboard in which a high-density connector (first high-density connector) having a number of pins greater than the number of signal pins of the plurality of required signal buses is installed in each slot. A large number of signal lines including various signal buses can be wired in common to all slots. In the present invention, by fitting the first high-density connector to the back panel side of a PWB (printed wiring board) that is used by connecting to a specific signal bus on the motherboard, the pins of the connector can be connected to the back panel side. A second high-density connector that is connected to the other connector is attached. By doing this, the position of the slot where the PWB can be mounted in the chassis to which the motherboard is attached does not depend on the type of PWB.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 7 is a front view showing the back configuration of the motherboard 20 applied to the present invention, and shows the signal bus
P ₁₁ to _{P 13} (portions surrounded by broken lines) are wired in common to all slots with slot numbers S01 to S12. Note that in the figure, the specific wiring state of the signal lines constituting the signal buses P ₁₁ to _{P 13} is not shown, and only a portion of the input/output pins connected to each signal line is shown. The number of input/output pins (terminals) for each slot on the motherboard 20 is
There are 2N slots (N is a multiple of 2), and each slot is arranged in a matrix of 4 rows and N/2 columns. The pitch of these input/output pins in the direction parallel to each slot is the same as in the example of FIG. The main difference between the motherboard 20 of this embodiment and the motherboard 5 of FIG. 2 is that the signal buses P ₁₁ to _{P 13} are wired in common to all slots, and the number of input/output pins for each slot is 2N. (N in the example in Figure 2)
This is the point. The difference in the number of input/output pins is that on the motherboard 5, the input/output pins for each slot are arranged in a matrix of 2 rows and N/2 columns, whereas on the motherboard 20, the input/output pins for each slot are arranged in a matrix of 2 rows and N/2 columns. This is because they are arranged in a matrix of 4 rows and N/2 columns. In this way, in this embodiment, by increasing the number of input/output pins per slot to 2N (from N in the conventional case), the number of pins used for signal buses P ₁₁ , P ₁₂ , and P ₁₃ per slot can be reduced. If n _P11 , n _P12 , n _P13 , then n _P11 + n _P12 +
n _P13 ＜2N is satisfied. As a result, as described above, the signal buses P ₁₁ to _{P 13} can be wired in common to all slots. Although not shown in FIG. 7, in this example, 2N and n _P11
Corresponding to the difference in the number of pins (terminals) from +n _P12 and +n _P13 , signal lines different from signal buses _P11 to _P13 are wired in common to all slots, and these signal lines are connected to the free edge side of the conventional PWB. The cable that was connected to it has been replaced. Figure 8 shows the motherboard 20
2, two high-density connectors (first high-density connectors) 21 . . . 21 are attached to the motherboard 20 corresponding to each slot. The high-density connector 21 has input/output pins 22, 22, . . . arranged in a matrix of 4 rows and N/4 columns, and its vertical cross-sectional shape is as shown in FIG. In the figure, 23a to 23d are contact parts.

Figure 10 shows the appearance of PWB (printed wiring board) 30i applied to the present invention, and 31 and 31 are
This is a high-density connector (second high-density connector) attached to the back panel side of the PWB30i. FIG. 11 is a front view of the high-density connector 31 seen from the back panel side, and FIG. 12 is a sectional view thereof along X'-Y'. In this embodiment, high-density connector 3
1 is N arranged in a matrix of 4 rows and N/4 columns.
It has input/output pins 32, 32.... 1st
In Figure 2, 33a to 33d are high-density connectors 3.
1 is a contact portion that connects with the contact portions 23 a to 23 d in a one-to-one correspondence by fitting with the high-density connector 21 .

Therefore, in this embodiment, the signal buses P ₁₁ to _{P 13}
PWB30i (which requires any one of the signal buses _P11 to _P13 to the high-density connectors 21, 21 mounted on the motherboard, in which a large number of signal lines including Namely A type PWB30i, B type PWB30
The high-density connectors 31, 31 mounted on the i or C type PWB30i) are indicated by the arrow a in Figure 13.
By inserting it in the direction shown,
Regardless of the type of PWB 30i, any slot position can be connected to the required signal bus.

Figure 14 shows A type _PWB301 to ₃₀₃ , B type _PWB304 to ₃₀₇ , and C type PWB3.
₀₈ shows the appearance of the chassis 41 in which the chassis 41 is mounted, and the symbols S01 to S12 are the slot numbers of the chassis slots. In this example, A type
The PWB is used by being connected to the signal bus P ₁₁ (see Figure 7) as a memory bus, and the B type PWB is connected to the signal bus P ₁₂ (see Figure 7) as a system bus.
The C type PWB is used by being connected to a signal bus _P13 (see FIG. 7) as an input/output bus. In the example shown in FIG. 14, the A type PWBs 30 ₁ to 30 ₃ are inserted into the slots with slot numbers S01 to S03 of the chassis 41, and the B
Type _PWB304 to ₃₀₇ are also inserted into slot numbers S04 to S07, and C type
_PWB308 is also inserted into slot number S08, and slot number S09 to S1.
The 4 slots in 2 are expanded areas. now,
For example, if two A-type PWBs 30 ₉ , 30 ₁₀ and two C-type PWBs 30 ₁₁ , 30 ₁₂ are to be added to the chassis 41 with the basic configuration shown in FIG. It can be mounted in any slot position of slot numbers S09 to S12). The parts indicated by broken lines in FIG. 14 indicate the four PWBs 30 ₉ to 30 ₁₂ additionally mounted in the above-mentioned expansion area.
In the example of FIG. 14, the slot number S of chassis 41 is
09, A type PWB30 ₉ in S10 slot,
30 ₁₀ , and C type PWBs _{30 11} and 30 ₁₂ are mounted in slots with slot numbers S11 and S12, respectively. As is clear, the signal bus
In a chassis 41 having a motherboard 20 in which a large number of signal lines including _P11 to _P13 are wired in common to all slots, C to slot numbers S09 and S10 are connected to the expansion area, contrary to the above example. It is also possible to mount type PWBs 30 ₁₁ and 30 ₁₂ and mount A type PWBs 30 ₀₉ and 30 ₁₀ in slot numbers S11 and S12. Furthermore, PWB30 ₁ ~
30 ₁₂ is all slot numbers S01~ of chassis 41
It can be mounted in any slot of S12.

In addition, in the embodiment, the high-density connector 21,
Although the explanation has been made assuming that two connectors 31 are provided per slot and two connectors per PWB, these two connectors may be formed by one connector, and the high-density connector 31 may be formed according to the type of PWB. One may be removed.

[Effect of idea]

As described in detail above, the printed wiring board mounting structure of the present invention can achieve various effects listed below.

A PWB (Printed Wiring Board) can be freely mounted in any slot position of the chassis regardless of its type.

Therefore, empty slots can be used efficiently, especially during system expansion, and implementation efficiency is improved.

Signal lines other than the signal bus are wired in common to all slots on the motherboard, so they can be connected on the motherboard on the back panel side in the same way as the signal bus. There is no need to connect a cable through the
As a result, there is no need for a connector on the free edge side or a connection cable.

[Brief explanation of the drawing]

Figure 1 is an external perspective view of a conventional chassis with a printed wiring board mounted on it, Figure 2 is a schematic diagram of the signal bus wiring state of the motherboard attached to the chassis, and Figure 3 is a portion of Figure 2. FIG. 4 is an X-Y sectional view of the perspective view of FIG. 1, and is a diagram showing the mounting state of the printed wiring board on the motherboard. FIG. FIG. 6 is an external perspective view of a conventional printed wiring board, FIG. 7 is a front view showing an embodiment of the motherboard according to the present invention, and FIG.
Figure 9 is a side view of the connector, Figure 9 is an enlarged longitudinal cross-sectional view of the high-density connector shown in the side view of Figure 8,
0 is an external perspective view showing an embodiment of the printed wiring board according to the present invention, FIG. 11 is a front view of a high-density connector mounted on the printed wiring board of the above embodiment, and 12th
The figure is an X'-Y' cross-sectional view, Figure 13 is a diagram for explaining the connection between the connectors between the motherboard and the printed wiring board, and Figure 14 shows an example of the chassis on which the printed wiring board is mounted. It is an external perspective view. _P1 to _P3 , _P11 to _P13 ...Signal bus, 1,41...
Shashi, 2 ₁ , 2 ₂ , 3 ₁ - 3 ₅ , 4, 4 ₁ - 4 ₃ ,
30 ₁ ~ 30 ₁₂ ...Printed wiring board (PWB), 5,2
0... Motherboard, 8... Expansion chassis, 2
1, 21...first high-density connector, 31, 31...
...Second high-density connector.

Claims (1)

[Scope of utility model registration request] A motherboard on which signal lines including multiple types of required signal buses are wired in common to all slots, and N terminals connected to the signal lines arranged in a matrix of 4 rows and N/4 columns. a first high-density connector installed in each slot of the motherboard; a plurality of printed wiring boards connected to each slot of the motherboard; 4 lines connected to any of the connector's signal buses.
The first high-density connector includes a second high-density connector having N terminals arranged in a matrix of N/4 rows, and a chassis mounting a motherboard to which the plurality of printed wiring boards are connected. and the second high-density connector, any of the printed wiring boards can be connected to the motherboard.