JPH0632396B2 - Electronic circuit - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to connecting a printed wiring board unit used as a substitute for the electronic component until the electronic component to be mounted on the printed wiring board is completed. Related to electronic circuits.

[Technical Background of the Invention] In recent years, in order to reduce the size and increase the functionality of electronic devices, downsizing and high density of printed wiring board units housed in the devices are required. Therefore, I mounted on the printed wiring board
For C as well, in order to achieve high density, high speed, and cost reduction, LSI such as GPA (pin grid array) has been used instead of the conventional DIP type.

However, the development of PGA elements may be delayed with respect to the development of electronic equipment, and the PGA element may not be completed by the delivery date of the equipment. In such a case, the conventional element is used to generate the PGA element.
A printed wiring board unit having the same function as that of the A element is created, and this printed wiring board unit is used by being connected to the printed wiring board until the PGA element is completed.

FIG. 5 shows a conventional connection method between a printed wiring board unit used instead of a PGA element and a printed wiring board on which the PGA element is to be mounted.

The printed wiring board 1 has various electronic components 3 in addition to the PGA element 2.
Has been implemented. In addition, another PGA element (hereinafter referred to as an incomplete PGA element) other than the PGA element 2 is scheduled to be mounted on the printed wiring board 1, and the incomplete PGA element is mounted. Part of unfinished PG
A socket 4 for mounting an A element is provided. And
A plurality of connectors 6 connected to the socket 4 via the wiring pattern 5 are provided adjacent to the socket 4 or at the end of the printed wiring board 1.

Reference numeral 8 denotes a printed wiring board unit (hereinafter referred to as a substitute unit) having the same function as that of the unfinished PGA element, and the substitute unit 8 is made of the conventional element 9. The alternative unit 8 is also provided with a connector 10 corresponding to the connector 6.

The alternative unit 8 is connected to the socket 4 by connecting the connector 6 and the connector 10 with the connection cable 11. As a result, the unit of the printed wiring board 1 can be used as a finished product. After the unfinished PGA element is completed, the PGA element is mounted on the socket 4 and used as an original unit of the printed wiring board 1.

[Problems of Background Art] However, the above connection method has the following problems because it is necessary to attach a large number of connectors 6 to the printed wiring board in order to connect the alternative unit 8.

Since a large number of connectors 6 are required, the number of parts is increased and the product cost is increased. Further, since it is necessary to provide a space for mounting the connector 6 and a space for the wiring pattern 5 in the printed wiring board 1, miniaturization of the printed wiring board 1 and eventually miniaturization of the device are hindered. And, this is a very unsatisfactory result in downsizing the device because the unfinished PGA element becomes an unnecessary space after completion. Furthermore, since the design of the arrangement of the connector 6 or the layout of the wiring pattern 5 is added, it takes extra time to design the printed wiring board 1.

[Object of the Invention] The present invention has been made in view of the above-mentioned conventional drawbacks, and replaces the electronic component without changing the configuration of the printed wiring board when the original electronic component such as the PGA element is mounted. It is an object to provide an electronic circuit in which a replacement unit is connected to a printed wiring board.

SUMMARY OF THE INVENTION An electronic circuit according to the present invention includes a main printed circuit board on which a socket for mounting an electronic component having a specific function is mounted, and a signal having the same function as the electronic component and the same signal input as the electronic component. An alternative printed circuit board having an output terminal, one end of which is connected to the socket and the other end of which is connected to a signal input signal terminal of the alternative printed circuit board, and a circuit of the main printed circuit board and the alternative printed circuit board. The signal input and output terminals are connected to a signal cable to achieve the above object.

Embodiments of the Invention Embodiments of the present invention will be described below in detail with reference to FIGS. 1 to 4.

1 and 2 are views for explaining the first embodiment of the present invention.

In the figure, 20 is a printed wiring board (main printed circuit board). In addition to the PGA element 21, various electronic components 22 are mounted on the printed wiring board 20, and a socket for mounting an unfinished PGA element
23 are provided.

25 is an alternative unit (alternative printed circuit board) having the same function as the unfinished PGA element. The replacement unit 25 is made of a conventional element 26, and is provided with a connector (connecting portion) 27.

Reference numeral 30 is a signal cable for connecting the alternative unit 25 to the printed wiring board 20.

The signal cable 30 is, as shown in FIG.
An adapter part (first connection part) 31 directly connected to 23,
A connector portion (second connecting portion) 32 connected to the connector 27 and a flexible substrate 33 connecting the adapter portion 31 and the connector portion 32 are formed.

The adapter section 31 is provided with a plurality of insertion pins 35 connected to the jack (not shown) of the socket 23,
The ends 36 of the insertion pins 35 on the flexible board 33 side are soldered to the lands 37 of the flexible board 33.

The flexible boards 33 are prepared in the same number as the number of connector portions 32 connected to the adapter portion 31 (hence, the number of connectors 27 provided in the alternative unit 25). Since the number of input / output pins of the PGA element is large, a plurality of connector parts 32 are required for one adapter part 31. Therefore, the flexible board 33 includes the number of connector parts 32 (4 in this example).
Only one) is overlaid. A wiring pattern 39 is provided on each of these flexible boards 33, the land 37 is formed on one end side of the wiring pattern 39, and the other end side is connected to each contact 40 of the connector section 32. Has been done.

As shown in FIG. 2, the signal cable 30 has its adapter portion 31 directly connected to the socket 23 and its connector portion 32 connected to the connector 27. As a result, the alternative unit 25 is connected to the printed wiring board 20.

In this case, the adapter part 31 is directly connected to the socket 23. Therefore, the printed wiring board 20 does not require the connector 6 which has been conventionally required, and the wiring pattern 5 accompanying this is not required. Therefore, the replacement unit 25 can be used with the same configuration as the printed wiring board 20 when the PGA element is mounted.
Can be connected to the printed wiring board 20.

In this example, the case of connecting the alternative unit of the PGA element has been described, but the present invention is not limited to the PGA element.
Needless to say, it can be used to connect an alternative unit of another electronic component such as DIP type or SIP type. Further, the wiring portion 33 is not limited to the flexible substrate, and a general electric wire, a ribbon cable or the like may be used.

FIG. 3 and FIG. 4 are views for explaining the second embodiment of the present invention.

In the signal cable 30A of this embodiment, as shown in FIG.
As the first connecting portion and the second connecting portion, adapter portions 31a 1 and 31b 2 which can be connected to the socket 23 are used. Also, an alternative unit (alternative printed circuit board) 25
Also in A, the printed wiring board 20 is used instead of the connector 27.
A socket 42 having the same structure as the socket 23 is provided.

Further, the wiring pattern 39a of the flexible substrate 33a is connected to (a) to (a) and (a) to (a) of the wiring pattern 39a, as is apparent from FIG. Even when the signal cable 30A is rotated 180 °, the insertion pin 35a and the insertion pin 35b connected to each other are in the same position. For example, the y of the insertion pin 35a, which is electrically connected to the X of the insertion pin 35a, and the y of which is connected to the X and Y of the insertion pin 35b, is at the same position even when the signal cable 30A is rotated 180 degrees.

Due to the above configuration, the signal cable 30A
One of the adapter parts 31a and 31b of the socket 23
By connecting the other to the socket 42, the alternative unit 25A is connected to the printed wiring board 20.

In this case, unlike the first embodiment, the replacement unit 25A
And the second connection part (adapter part 31a or 31b) can be connected with one touch, and it is not necessary to consider the direction of the signal cable 30A (it is not necessary to pay attention to the pin numbers of the insertion pins 35a and 35b). Therefore, connection becomes easy.

Moreover, even though the alternative unit 25A is
Instead of 27, only one socket 42 needs to be provided, and the alternative unit 25A itself is also small in size, so that the device that houses it can be downsized.

EFFECTS OF THE INVENTION As described above, the electronic circuit of the present invention has a configuration in which the alternative unit is connected to the printed wiring board by directly connecting the adapter to the socket for mounting the electronic component. An alternative unit can be connected to the printed wiring board in a configuration for mounting an original electronic component. Therefore,
It is possible to reduce the size of the printed wiring board as compared with the conventional one.
Also, the manufacturing cost can be reduced. Moreover, if the connecting portion of the alternative unit has the same structure as the socket of the printed wiring board (therefore, the adapter portion having the same structure is provided at both ends of the signal cable), the alternative unit can be downsized.
It is possible to further reduce the size of the device that stores them.

[Brief description of drawings]

1 and 2 are views for explaining the first embodiment of the present invention. FIG. 1 is a perspective view of a signal cable, and FIG.
It is a top view which shows the state which connected the printed wiring board and the alternative unit by the signal cable of the figure. FIGS. 3 and 4 are views for explaining the second embodiment of the present invention, FIG. 3 is a perspective view of a signal cable, and FIG.
It is a top view which shows the state which connected the printed wiring board and the alternative unit by the signal cable of the figure. FIG. 5 is a plan view showing a conventional method of connecting a printed wiring board and a substitute unit. 20 …… Printed wiring board (main printed circuit board) 21 …… PGA element (electronic parts) 23 …… Socket 25, 25A …… Printed wiring board unit (alternative printed circuit board) 27 …… Connector (connection part) 30, 30A ...... Signal cable 31 ...... Adapter part (first connection part) 31a, 31b ...... Adapter part (first or second connection part) 32 ...... Connector part (second connection part) 33, 33a ... … Flexible board (wiring part) 42… Socket (connection part)

Claims (3)

[Claims] 1. A main printed circuit board having an electronic circuit,
An alternative printed circuit board having a socket mounted on the main printed circuit board, to which an electronic component having a specific function is mounted, and a signal input / output terminal having the same function as the electronic component and having the same signal input / output terminal as the electronic component. And a connection part connected to a socket on the main printed circuit board at one end and a connection part connected to a signal input / output terminal of the alternative printed circuit board at the other end,
It is composed of a signal cable in which a circuit connecting the circuit on the main printed circuit board and a signal input / output terminal of the alternative printed circuit board is formed, and the alternative printed circuit board performs the function of the electronic component. Characterized electronic circuit. 2. The electronic circuit according to claim 1, wherein the signal cable is composed of a flexible printed circuit board. 3. The signal input / output terminal of the alternative printed circuit board is connected to the same socket as the socket on the main printed circuit board, and the connection portions at both ends of the signal cable are the same connected to the socket. The electronic circuit according to claim 1 or 2, wherein the electronic circuit has the following configuration.