JPH04299593A - Connection structure of printed wiring board - Google Patents

Abstract

PURPOSE:To obtain a connection structure of a printed wiring board which can be easily connected with other printed wiring board without thermally damaging a printed wiring board adopting a metal insulative board. CONSTITUTION:An insertion hole 6c is formed in a first printed wiring board 6 wherein an electronic parts 4 is mounted on an insulative board 6a. A second printed wiring board 7 wherein an electronic parts 4 is mounted on a metal insulative board 7a is engaged with the insertion hole 6c in a plug-in manner, thereby coupling both printed wiring boards. A contact terminal 8 of spring metal is soldered to a first printed wiring board or the second printed wiring board, and circuits of both printed wiring boards are connected via the contact terminal 8 in the state that the second printed wiring board is engaged with the above insertion hole.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a printed wiring board for implementing a composite hybrid IC constructed by combining a plurality of modules.

0002

2. Description of the Related Art A printed wiring board connection structure as shown in FIGS. 7 and 8 has been known as a structure of a composite hybrid IC in which a plurality of modules are combined. Here, FIG. 7 shows a printed wiring board 1 in which a conductor pattern is formed on an insulating substrate such as resin or glass and electronic components are mounted thereon, and a printed wiring board 2 having the same configuration is connected in a plug-in manner to connect the circuits between the two. The end of the other printed wiring board 2 is inserted in the direction of the arrow into the insertion hole opened in one printed wiring board 1 to connect the two, and each printed wiring board is connected in this connected state. External terminal lands 1a and 2a formed on the conductor patterns of plates 1 and 2 are soldered (the soldered portion is indicated by reference numeral 3). Note that 4 is an electronic component mounted on the printed wiring board. On the other hand, FIG. 8 shows the packaged printed wiring board 5 as printed wiring board 1.
The lead pin 5b pulled out from the case 5a of the printed wiring board 5 is connected to the printed wiring board 1.
It is inserted into a through hole 1b formed on the side, and the two circuits are interconnected by soldering.

0003

[Problems to be Solved by the Invention] As a recent trend, metal insulating substrates with excellent heat dissipation are often used as substrates for printed wiring boards that incorporate elements that generate a large amount of heat, such as power modules. There is. By the way, when a printed wiring board employing a metal insulating substrate is connected to another printed wiring board using the method described in Fig. 7, it is possible to connect the printed wiring board to another printed wiring board using the method described in Figure 7. On the metal insulated board side, heat applied from a soldering iron etc. may escape from the soldering part to the metal board side, causing soldering defects. Soldered parts may re-melt due to heating, causing deterioration of solder joint strength and misalignment of parts.

For this reason, conventionally, when connecting a printed wiring board employing a metal insulating substrate to another printed wiring board, the connection method described in FIG. 8 has generally been adopted. is the current situation. However, with this connection method, the printed wiring board 5 is equipped with a case 5a, lead pins 5b, etc., which increases the cost, and the product combined with the printed wiring board 1 has a large external shape, especially the height dimension. Become. In this regard, if a connection structure for connecting printed wiring boards of metal insulating substrates in a plug-in manner as shown in FIG. 7 can be adopted, the entire product can be made smaller and more compact.

The present invention was conceived in view of the above points, and its object is to combine a printed wiring board employing a metal insulating substrate and a printed wiring board employing an insulating substrate, and to interconnect circuits between the two. When connecting printed wiring boards, it is possible to easily connect printed wiring boards in a plug-in manner without using soldering methods that may cause thermal damage to the soldered parts of mounted components on the metal insulated board side. An object of the present invention is to provide a connection structure for a printed wiring board.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a first printed wiring board in which electronic components are incorporated in an insulating substrate, and a second printed wiring board in which electronic components are incorporated in a metal insulating substrate. As a printed wiring board connection structure for connecting printed wiring boards in a plug-in manner, an insertion hole is provided on the first printed wiring board side into which the end of the second printed wiring board is inserted, and a second printed wiring board is inserted into the insertion hole. The configuration is such that the circuits of the printed wiring boards are interconnected via the contact terminals with the ends of the printed wiring boards of No. 2 inserted.

Here, the contact terminal in the above structure is made as a spring metal terminal, and as an embodiment of the mounting structure of the contact terminal, (1) the insertion hole of the first printed wiring board is Formed as a through hole,
and a second contact terminal facing the conductor of the through hole.
Solder to the conductor pattern on the printed wiring board side of (2)
) Solder the contact terminal to the conductor pattern on the first printed wiring board with the contact terminal facing into the insertion hole; (3) Divide the contact terminal into two contact terminals that contact each other within the insertion hole; There is a configuration in which one side is soldered to the first printed wiring board side and the other side is soldered to the second printed wiring board side.

[0008] Furthermore, in the above structure, in order to reinforce the soldered portion of the contact terminal installed on the first printed wiring board side, the base of the contact terminal is extended and provided in the vicinity of the insertion hole. It can be soldered to a through-hole.

[0009]

[Operation] In the above configuration, by connecting the second printed wiring board in a plug-in manner to the insertion hole opened in the first printed wiring board, the circuits of both printed wiring boards can be simultaneously connected via the contact terminals. interconnected. Moreover, since no soldering is performed when connecting printed wiring boards, there is no effect on the solder joints on the components mounted on the metal insulating board. Note that when contact terminals are provided on the second printed wiring board side that employs a metal insulating substrate, this can be handled by simultaneously soldering the contact terminals to the electronic components in the same mounting process.

0010

Embodiments Examples of the present invention will be described below with reference to FIGS. 1 to 6. In the embodiments shown in the figures, reference numeral 6 indicates a first printed wiring board using an insulating substrate, 7 indicates a second printed wiring board using a metal insulating substrate, and 8 and 9 indicate the first printed wiring board 6. and a contact terminal for interconnecting the circuits of the second printed wiring board 7, and 10 represents the soldered portion of the contact terminals 8 and 9. Regarding the first printed wiring board 6, 6a is an insulating substrate, and 6b is a conductive pattern (copper foil).
, 6c is an insertion hole for connecting the second printed wiring board 7 in a plug-in manner, 6d is a through hole formed near the insertion hole 6c, and 6e is a through hole conductor formed in the insertion hole 6c. (copper foil). On the other hand, regarding the second printed wiring board 7, 7 is a metal insulating board, 7b is a conductive pattern (
copper foil).

First, in the embodiment shown in FIG. 1, a contact terminal 8 is installed on the second printed wiring board 7, and is attached to the end of the conductor pattern 7b facing the insertion hole 6c of the first printed wiring board 6. It is soldered. The structure of this contact terminal 8 is shown in FIG.
As shown in the figure, the spring metal terminal is made by bending an elastic metal plate into a U-shape, and is soldered at the same time in the same soldering process when electronic components 4 are mounted.

In this configuration, in order to connect the first printed wiring board 6 and the second printed wiring board 7, insert the second printed wiring board 7 into the insertion hole 6c of the first printed wiring board 6 by inserting the second printed wiring board 7 into the insertion hole 6c of the first printed wiring board 6. Insert it in a plug-in style from above as shown. As a result, both printed wiring boards 6 and 7 are mechanically connected to each other, and at the same time, the contact terminal 8 comes into pressure contact with the through-hole conductor 6e of the insertion hole 6c, and the contact terminal 8 is pressed into contact with the through-hole conductor 6e of the insertion hole 6c. The circuit is connected.

On the other hand, in the embodiment shown in FIG. 3, contact terminals 9 that come into contact with contact terminals 8 installed on the second printed wiring board 7 are also provided on the first printed wiring board 6 side. The terminal 9 has a terminal base portion soldered to the conductive pattern 6b with the terminal tip portion facing the insertion hole 6c. By dividing the contact terminal into two pieces and installing them on each printed wiring board 6, 7 in this way, a high current carrying capacity can be secured at the connection part, and the strength and durability of the connection part will also be increased, making it easier to maintain and inspect parts. It is possible to repeatedly insert and remove the printed wiring board 7 as necessary for replacement.

FIG. 4 shows an applied example of the embodiment shown in FIG. 6
It is inserted into another through hole 6d formed near c and soldered. According to this configuration, the soldered portion of the contact terminal 9 is reinforced.

In the embodiment of FIG. 5, the first printed wiring board 6
A contact terminal 9 made as a spring metal terminal is attached only to the terminal, and when the second printed wiring board 7 is fitted into the insertion hole 6c of the first printed wiring board 6, the contact terminal 9 is attached at the same time. is pressed against the conductor pattern 7b of the second printed wiring board 7, and a circuit is interconnected between the printed wiring boards 6 and 7.

Furthermore, in the embodiment shown in FIG. 6, the base of the contact terminal 9 in the embodiment shown in FIG. 5 is extended, and similarly to the embodiment shown in FIG. This is what I did.

[0017]

[Effect of the invention] The connection structure of the printed wiring board of the present invention is as follows:
Since it is configured as described above, the following effects are achieved. In other words, since soldering is not performed when connecting printed wiring boards, even for printed wiring boards that use metal insulated substrates, there is no problem with soldering defects and soldering points that occur when using the soldering connection method. There is no risk of problems such as parts shifting due to remelting, and this enables high-density packaging and greatly improves product quality and reliability. In addition, the use of a plug-in connection method and contact terminals allows the product to be made smaller and more compact, and it also has the advantage of easy connection and the ability to repeatedly attach and detach the printed wiring board as necessary for inspection, parts replacement, etc. .

[Brief explanation of drawings]

[Fig. 1] A cross-sectional view of the configuration of an embodiment of the present invention

[Fig. 2] External perspective view of the contact terminal in Fig. 1

FIG. 3 is a cross-sectional view of the configuration of different embodiments of the present invention.

[Fig. 4] A cross-sectional view of the configuration of the applied example shown in Fig. 3.

FIG. 5 is a cross-sectional view of a configuration of still another embodiment of the present invention.

[Fig. 6] A cross-sectional view of the configuration of the applied example shown in Fig. 5.

[
Figure 7: A perspective view showing an example of a conventional printed wiring board connection structure

[Fig. 8] A cross-sectional diagram of a conventional connection structure example different from that shown in Fig. 7.

[Explanation of symbols]

4 Electronic parts 6 First printed wiring board 6a Insulating board 6b Conductor pattern 6c insertion hole 6d Through hole 6e Through-hole conductor 7 Second printed wiring board 7a　Metal insulated substrate 7b Conductor pattern 8 Contact terminal 9 Contact terminal 10 Soldering part of contact terminal

Claims (6)

[Claims] Claim 1: A printed wiring board connection in which a second printed wiring board, in which electronic components are incorporated in a metal insulating substrate, is connected in a plug-in manner to a first printed wiring board in which electronic components are incorporated in an insulating substrate. The structure is such that an insertion hole into which a second printed wiring board is inserted is provided on the first printed wiring board side, and the second printed wiring board is inserted into the insertion hole,
A connection structure for a printed wiring board, characterized in that circuits on the printed wiring board are interconnected through contact terminals. 2. The connection structure for a printed wiring board according to claim 1, wherein the contact terminal is a spring metal terminal. 3. The connection structure according to claim 1, wherein the first
The insertion hole of the printed wiring board is formed as a through hole, and the contact terminal is soldered to a conductor pattern on the second printed wiring board side facing the conductor of the through hole. Connection structure of printed wiring board. 4. The connection structure according to claim 1, wherein the contact terminal is soldered to the conductor pattern on the first printed wiring board side with the terminal tip facing into the insertion hole. Connection structure of printed wiring board. 5. The connection structure according to claim 1, wherein the contact terminal comprises two contact terminals that come into contact with each other within the insertion hole;
A connection structure for a printed wiring board, characterized in that one of them is soldered to a first printed wiring board and the other is soldered to a second printed wiring board. 6. The connection structure according to claims 4 and 5,
A connection structure for a printed wiring board, characterized in that a contact terminal installed on the first printed wiring board side is soldered to another through hole provided in the vicinity of the insertion hole by extending the base of the contact terminal.