JPH0793494B2 - Connection method between printed wiring boards - Google Patents

Description

The invention relates to a method of connecting printed wiring boards using multi-pole relay terminals, which has good workability and does not require expensive parts, and is suitable for downsizing of the apparatus. In order to connect the first and second printed wiring boards, in which the leads of the electronic component inserted from the front surface side are soldered on the rear surface side so that the rear surface sides face each other, a plurality of pins parallel to each other are connected. A step of inserting the pin of the multi-pole relay terminal which is detachably integrated with the connecting part together with the lead of the electronic component from the front surface side of the first printed wiring board and performing soldering on the back surface side thereof; After the step of inserting the leads of the electronic component from the front surface side of the second printed wiring board and soldering on the back surface side thereof, the multi-pole relay terminal soldered to the first printed wiring board is connected. Pin above the second The printed wiring board is inserted from the back side and soldered on the front side.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting printed wiring boards using multipole relay terminals.

In the field of electronic device manufacturing, electronic components such as ICs, capacitors, resistors, and connectors are inserted into a printed wiring board with a wiring pattern formed on the front surface or the back surface, or the wiring patterns are laminated inside, An electronic circuit is configured by soldering with a pattern. Depending on the scale of the electronic circuit or the limitation of the external shape of the device, it may not be possible to form the electronic circuit on a single printed wiring board. In such a case, the electronic circuit may be divided and a plurality of printed wiring boards may be formed. Then, the printed circuit boards are connected to each other to obtain an electronic circuit having a desired function. In this way, what is required when connecting printed wiring boards is that if the electrical characteristics of the connection part are satisfactory, then (a) good workability, (B) No expensive parts are required, and (c) No large space is required for connection.

2. Description of the Related Art A conventional connecting method between printed wiring boards will be described with reference to FIG.

(A) Connector jack 43 on one printed wiring board 41
And connect the connector plug 44 to the other printed wiring board 42.
Is mounted, and the connector plug 44 is fitted into the connector jack 43 for connection.

(B) The printed wiring boards 41 and 42 are connected via the molded terminal board 45 in which a plurality of conductive pins are embedded at predetermined intervals.

(C) The jacks 46 are mounted on the printed wiring boards 41 and 42, respectively, and the flat cables 47 with plugs are used for connection.

(D) Connection is made by simply soldering the wire 48.

Problems to be Solved by the Invention Of the methods shown in FIG. 8, the method (d)
It is necessary to insert each wire into the printed wiring board one by one,
Since it is necessary to solder the solder one by one, the workability is not good. Even with the methods (a) and (b), when the electronic component is mounted on the outside of both printed wiring boards, the soldered portion is inside the both printed wiring boards, that is, both printed wiring boards are high. Since it will be the side of the surface facing
When soldering the connector or the molded terminal board to the printed wiring board, automatic soldering for electronic parts cannot be applied, and manual soldering is required, resulting in poor workability.

In the methods (a), (b) and (c), the connector,
Since relatively expensive parts such as molded terminals and flat cables are required, the price of the device increases.

In the methods (a) and (b), for example, when general-purpose components are used as connectors or molded terminals, the printed wiring boards cannot be brought closer to each other by a predetermined distance or more, and the size of the device is inevitably increased. .

The present invention has been made in view of such circumstances, and an object thereof is to provide a method for connecting printed wiring boards which has good workability and does not require expensive parts and is suitable for downsizing of the device.

Means for Solving the Problems FIG. 1 is a principle diagram of the present invention.

This method of connecting printed wiring boards is such that the leads 3 and 4 of the electronic components 1 and 2 inserted from the front side are soldered on the back side and the first and second printed wiring boards 5 and 6 are connected to each other on the back side. It can be used when facing and connecting.

The characteristic of the first printed wiring board 5 is that the pins 7 of the multi-pole relay terminal 9 formed by integrally separating the plurality of parallel pins 7 from each other with the connecting portion 8 together with the leads 3 of the electronic component 1 are separated. Of the electronic component 2 from the front side of the second printed wiring board 6 and the step of soldering from the front side of the second printed wiring board 6 as shown in FIG. Then, as shown in FIG. 2B, after the step of soldering on the back surface side thereof, the pins 7 of the multi-pole relay terminal 9 soldered to the first printed wiring board 5 are set to the second The printed wiring board 6 is inserted from the back surface side, and soldering is performed on the front surface side as shown in FIG.

Action In the present invention, the pin 7 of the multi-pole relay terminal is inserted from the front surface side of the first printed wiring board 5 because the pin 7 is attached to the lead 3 of the electronic component 1 and the first printed wiring board 5. This is because they are located on the same side. As a result, when the leads 3 of the electronic component 1 are automatically soldered, the pins 7 can be soldered at the same time, which improves workability. Moreover, the reason why the pin 7 is integrated with the connecting portion 8 to form the multi-pole relay terminal 9 is to insert a plurality of pins 7 into the printed wiring board at the same time by one insertion operation. Good quality. Further, the pin 7 and the connecting portion 8 can be separated from each other by connecting the first and second printed wiring boards 5 and 6 through the pin 7 and then disconnecting the connecting portion 8 respectively. This is because the pin 7 of is electrically independent. On the other hand, between the first and second printed wiring boards 5 and 6 to which the connection is made, there is no connector, mold terminal or the like unlike the conventional case, so that the distance between the printed wiring boards can be freely set. It is easy to downsize the device. Regarding the multi-pole relay terminal 9,
Since the metal plate can be easily formed by punching or the like, no expensive parts are required in the method of the present invention.

EXAMPLES Examples of the present invention will be described below with reference to the drawings.

FIG. 2 is a front view of a multi-pole relay terminal that can be used for carrying out the method of the present invention, and FIG. 3 is a partially enlarged view (a) of FIG.
It is a side view (b). This multi-pole relay terminal 11
It is composed of a plurality of (for example, 30) pins 12 and a connecting portion 13 that connects these pins 12 to each other.
A hole 14 is provided at a required position for positioning when a plurality of multi-pole relay terminals are arranged and used. The tip 12a of the pin 12 has a tapered shape to facilitate insertion into the printed wiring board, and the connecting portion 13 side of the pin 12 has positioning when the pin 12 is inserted into the printed wiring board. A wide portion 12b for forming is formed.
A notch 15 is provided between the wide portion 12b of the pin and the connecting portion 13, and the pin 12 and the connecting portion 13 can be easily cut by bending the connecting portion 13 after fixing the pin 12. You can do it. The multipole relay terminal having such a shape can be easily manufactured by punching out a phosphor bronze plate having a thickness of 0.4 mm, for example. still,
By applying solder plating to at least the pin 12 of the multi-pole relay terminal, wettability to molten solder is improved during soldering with a printed wiring board, and there is no risk of defective soldering.

FIG. 4 is a side view of a back wiring board configured by connecting two printed wiring boards using the multi-pole relay terminal shown in FIGS. 2 and 3. A plurality of connectors 22 as electronic components are mounted on the front surface 21a side of the first printed wiring board 21, and the leads 22a thereof have a wiring pattern (not shown) on the back surface 21b side of the first printed wiring board 21. Soldered and connected. Connector 22 has
For example, a channel unit in a digital exchange can be detachably attached. On the other hand, on the surface 23a side of the second printed wiring board 23, a connector 24 that can be detachably attached to the gantry side is attached, and its lead
24a is on the back surface 23b side of the second printed wiring board 23,
It is soldered to a wiring pattern (not shown). 25 is a spacer for mechanically fixing the first and second printed wiring boards 21 and 23 to each other, and 26 is a pin 12 of the multipole relay terminal for the second.
Is a guide plate for preventing the pins 12 from falling down before being inserted into the printed wiring board 23.

A method of soldering the connector 22 and the multipole relay terminal 11 to the first printed wiring board 21 when the back wiring board is produced will be described. First, as shown in FIG. 5, the lead 22a of the connector 22 and the pin 12 of the multipole relay terminal 11 cut to an appropriate length are connected to the first printed wiring board.
Insert 21 from the surface 21a side. At this time, multi-pole relay terminal 1
If 1 is one, the inclination of the pin 12 is allowed to some extent, but if a plurality of multi-pole relay terminals 11 are arranged side by side, if the pin 21 is inclined, the second printed wiring board 23 Since it cannot be inserted easily, a pin as shown in FIG. 6 is used to make the pin 12 perpendicular to the first printed wiring board 21. That is, in this jig, a plurality of slits 33 are provided in the jig body 31 so that, for example, two rows of multi-pole relay terminals can be sandwiched, and a groove 32 for avoiding the connector 22 is provided in a portion where the slits 33 are not formed. By providing this jig from the front side of the first printed wiring board 21, the slit 33 holds the connecting portion 13 of the multi-pole relay terminal to prevent the pin 12 from playing. It can be lost. Then, in this way, the first printed wiring board 2 in which the leads 22a and the pins 12 project only on one surface
As for 1, the soldering can be easily performed by using, for example, an automatic soldering device in which molten solder overflows. When the soldering of the leads 22a and the pins 12 is completed, as shown in FIG. 7, the guide plate 26 in which a plurality of holes 35 are formed corresponding to the positions of the pins 12 is attached to the pins 12
It is possible to prevent the portion of the pin 12 projecting from the first printed wiring board 21 from being bent by being fitted in the.

On the other hand, regarding the second printed wiring board 23, its surface 23
The lead 24a of the connector 24 can be inserted from the a side, and the back surface 23b can be similarly soldered by the automatic soldering device. At this time, it is desirable to mask the portion of the second printed wiring board 23 where the pin 12 is to be inserted in order to prevent the solder from adhering and blocking the through hole.

The pins 12 soldered to the first printed wiring board 21
When soldering to the printed wiring board 23 of
Can be inserted from the back surface 23b side of the second printed wiring board 23, and the pins 12 projecting from the front surface 23a side can be soldered using a small solder bath containing molten solder. At this time, the separation distance between the first and second printed wiring boards 21 and 23 can be freely set by, for example, defining the thickness of the guide plate 26.

When the first and second printed wiring boards 21 and 23 are connected by the pins 12, the connecting portions 13 of the multipole relay terminal are bent to cut from the notches 15 so that the respective pins 12 are electrically independent. Can be The cutting of the multi-pole relay terminal in the cutout portion 15 does not have to be performed at the end of the series of steps as described above, and the pin 12 is connected to the first printed wiring board 21.
It may be performed immediately after soldering.

As described above, according to the present embodiment, since the soldering is performed by bringing the portion to be soldered into contact with the molten solder, it is possible to manually solder each pin using a soldering iron. In comparison, the working time can be significantly reduced. Further, since the multi-pole relay terminal is provided with the notch, it is easy to cut the connecting portion.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, it is possible to provide a method of connecting printed wiring boards, which has good workability and does not require expensive parts, and which is suitable for downsizing of the device. Play.

[Brief description of drawings]

FIG. 1 is a principle view of the present invention, FIG. 2 is a front view of a multipole relay terminal which can be used for implementing the present invention, and FIG. 3 is an enlarged view (a) of the multipole relay terminal and its side surface. FIG. 4B is a side view of a back wiring board showing an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention, in which a connector and a multipole relay terminal are provided on a first printed wiring board. 6 is a perspective view of a jig that can be used for carrying out the present invention, and FIG. 7 is a perspective view of a guide plate that can be used for carrying out the present invention. FIGS. 8A and 8B are explanatory views of the prior art. 1,2 ...... Electronic parts, 3,4,22a, 24a ...... Lead, 7,12 ...... Pin, 8,13 …… Coupling part, 9,11 …… Multipole relay terminal, 5,21 …… No. 1st printed wiring board, 6,23 …… Second printed wiring board.

Claims (1)

[Claims] 1. First and second soldering of leads (3, 4) of an electronic component (1, 2) inserted from the front side on the back side.
When connecting the printed wiring boards (5, 6) of the above with their back sides facing each other, a plurality of parallel pins (7) are detachably integrated with the connecting portion (8) to form a multi-pole relay terminal (9). The pin (7) of the electronic component (1) together with the lead (3)
Step of inserting from the front side of the printed wiring board (5) and soldering on the back side thereof, and the leads (4) of the electronic component (2) from the front side of the second printed wiring board (6). And the soldering is performed on the back side thereof, and then the pins (7) of the multi-pole relay terminal (9) soldered to the first printed wiring board (5) are connected to the second printed wiring board (5). The printed wiring board (6) is inserted from the back side and soldering is performed on the front side thereof.