JPH02201993A - Connection structure of printed board - Google Patents

Abstract

PURPOSE:To allow a part between both terminal patterns to be free from the exposed part of a board which is lacking in solder and make the connection strength of the above patterns strong by connecting an FPC terminal pattern to an edge face terminal pattern of a printed board and fixing them with solder. CONSTITUTION:A positioning hole 2B of each flexible printed circuit board (FPC) 2 is fitted in a pin 5 and the FPC 2 is engaged in a recessed part 4A of a board fixing member 4. Then a positioning hole 1C of each printed wiring board (PWB) 1 is fitted in the pin and the PWB 1 is put on top of the FPC 2. As pins 5 cause the PWB 1 and the FPC 2 to be disposed compulsorily to prescribed positions, a terminal pattern 2A of the FPC 2 and the terminal pattern 1A of the PWB 1 coincide with each other accurately. Then solder 3 is poured into an edge face recessed part 1B and the terminal patterns 2A and 1A are connected and fixed each other. Since a part between both terminal patterns is free from the exposed part of a board lacking in solder, connection strength is intensified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printed circuit board connection structure for connecting connection terminal patterns of printed circuit boards.

(Prior Art) Conventionally, when connecting a flexible printed circuit board (FPC) and another board, such as a hard printed circuit board (PWB), the connecting terminal patterns of each other are connected to each other at the edge of each board, as shown in FIG. The FPC is arranged and formed on the surface, and both connection terminal patterns are made to match each other, and both boards 1 and 2 are stacked in parallel and fixed with solder 3, and then the FPC is bent at a right angle as shown in Fig. 6. . However, in this connection method, when connecting and fixing the reconnection terminal pattern with solder 3, the fifth
As shown in Figure B, a gap of the base thickness d of the FPC2 is created between both connection terminal patterns, so the gap must be maintained with the strength of solder alone, so compared to the case where there is no gap between the patterns. However, there was a problem in that the connection strength between patterns was weakened.

As mentioned above, in the conventional connection method, the connection strength between the connection terminal patterns on both boards is weak, so some kind of reinforcing measures are required, such as increasing the thickness of the solder, to maintain the connection strength between the printed circuit boards. It has become.

(Problems to be Solved by the Invention) An object of the present invention is to provide a connection structure between printed circuit boards that connects the connection terminal patterns of two printed circuit boards so as to maintain sufficient connection strength.

(Means for Solving the Problem) When connecting a flexible printed circuit board to another printed circuit board, a connecting terminal pattern formed on the other printed circuit board is formed to extend around the end surface of the board to the back surface. , align the terminal pattern on the flexible printed circuit board with the terminal pattern on the back side of the above printed circuit board, insert it between the back side of the other printed circuit board and the other printed board fixing member, and then The corresponding terminal patterns were soldered together at the end face of the above-mentioned printed circuit board.

Furthermore, in order to measure the connection strength, an extension of the connection terminal pattern formed on the edge of the above-mentioned printed circuit board to the end surface of the same board was formed in the recess formed on the end surface of the above-mentioned board for each terminal pattern. The respective corresponding terminal patterns of both circuit boards were soldered to each other at the end face recesses.

In addition, when connecting a single-sided flexible printed circuit board to another printed circuit board, the connection terminal pattern formed on the single-sided flexible printed circuit board is bent 180 degrees with the pattern side facing out, and the terminals on the other printed circuit board are Align the pattern with the bent terminal pattern of the single-sided flexible printed circuit board, insert it between the bent part of the flexible printed circuit board and the printed circuit board fixing member, and solder the corresponding terminal patterns on both circuit boards. Connected.

(Function) According to the present invention, a terminal pattern is extended to the back surface for each terminal pattern on the end surface of another printed circuit board, and the FPC terminal pattern is brought into contact with the back surface terminal pattern, so that the FPC terminal pattern and the other printed circuit board are connected to each other. By connecting and fixing the terminal pattern on the end surface of the board with solder, both terminal patterns can be soldered without interposing an exposed part of the board where no solder is attached between the two terminal patterns, thereby increasing the connection strength. , forming a recess on the end surface of the other printed circuit board,
By extending the terminal patterns into the recesses and soldering the terminal patterns in the recesses, the area to be connected and fixed via the solder is increased, and the connection strength is increased. The above printed circuit board is a hard printed circuit board (PW).
B) or a flexible printed circuit board (FPC).

(Example) Fig. 1 shows an example of the present invention. In Fig. 1, 1
is a hard printed circuit board (PWB) with a terminal pattern IA formed on its surface, and the edge of the terminal pattern IA is connected to the PWB.
It extends to the end face recess IB formed on the end face of PW.
A positioning hole IC is provided near the side end of B1. 2 is a flexible printed circuit board (FPC) 2, in which the terminal pattern 2A is arranged to match the end face recess IB of the PWBI, and a positioning hole is provided near the side edge of the end at the same position as the positioning hole IC. 2B is provided.

Reference numeral 4 denotes a board fixing member, and a recess 4A having the same width as the FPC 2 and the same depth as the thickness of the FPC is formed on the FPC mounting end surface, and a positioning pin 5 is placed perpendicularly at the same position as the positioning hole 2B at the side end of the recess. It is fixed to .

A method of connecting PW) 11 and FPC 2 will be explained. F
Fit the positioning hole 2BE pin 5 of PC2, and
2 into the recess 4A of the board fixing member 4, fit the positioning hole IC of the PWBI into the bottle, and connect the PWB 1 to the FPC.
Lay it on top of 2. PWB 1 and FPC2 by Bin 5
is forcibly placed in a predetermined position, so that the terminal pattern 2A of FPC2 can be accurately matched with the terminal pattern IA of PWB 1. Next, pour the solder 3 into the end face recess IB and adjust the terminal pattern of FPC2. 2A and PWB
Connect and fix the terminal pattern IA of I.

Fig. 3 shows a method of manufacturing the pattern to be formed on the end face of this embodiment. A through hole is provided at the tip of the terminal pattern IA of the substrate PWB1, and after forming the pattern on the through hole surface, the pattern is formed on the through hole surface and then the pattern passes through the center line of the through hole. By cutting the substrate PWB1 at the cutting plane K, the PW shown in FIG.
B1 is produced.

The second embodiment describes the case where a double-sided hard printed circuit board and a flexible printed circuit board are connected. Since they are clamped, the clamping parts bear the bending stress at the ends of the FPC, and peeling stress is no longer applied to the connection parts, resulting in an effect of increasing the connection strength. However, the present invention is not limited to this, and a double-sided flexible printed circuit board may be used instead of the double-sided hard printed circuit board.

Furthermore, instead of using a double-sided printed circuit board, as shown in FIG.
Even if the bent part is brought into contact with the top surface of the other printed circuit board 2 to be connected and the terminal patterns are connected and fixed with solder, the same result as in the double-sided printed circuit board example described above can be achieved. , the effect of preventing peeling of the connecting portion of two printed circuit boards to be connected can be expected.

(Effects of the Invention) According to the present invention, each terminal pattern is extended to the back surface on the end surface of the printed circuit board, the terminal pattern of the FPC is brought into contact with the back surface terminal pattern, and the FPC terminal pattern and the printed circuit board are connected. By connecting and fixing the end face terminal pattern with solder, both terminal patterns can be soldered without intervening an exposed part of the board to which no solder is attached between the two terminal patterns, thereby increasing the connection strength. In addition, by forming a recess on the end surface of the printed circuit board, extending the terminal pattern on the four parts and the back surface, bringing the FPC terminal pattern into contact with the back surface terminal pattern, and soldering the FPC terminal pattern to the recessed terminal pattern, , the connection area of the terminal pattern has increased, and the connection strength has become even stronger.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is a side sectional view of the above embodiment, Fig. 3 is an explanatory diagram of the substrate manufacturing method of the above embodiment, and Fig. 4A is another embodiment of the present invention. FIG. 4B is a side sectional view of the above embodiment, FIG. 5A is a perspective view of the conventional example, FIG. 5B is a side sectional view of the conventional example, and FIG. 6 is the installation of the conventional example. 1... PWB, IA... terminal pattern, IB... end face recess, IC... positioning hole, 2...
...FPC52A...terminal pattern, 2B...positioning hole, 3...solder, 4...board fixing member, 5
···bottle.

Claims (3)

[Claims] (1) When connecting a flexible printed circuit board to another printed circuit board, the connecting terminal pattern formed on the end surface of the other printed circuit board is formed to extend around the edge of the above board to the back surface, and the flexible printed circuit board is Align the upper terminal pattern with the terminal pattern on the back side of the other printed circuit board, insert it between the back side of the other printed board and the same other printed board fixing member, and align the corresponding terminal patterns on both circuit boards. A printed circuit board connection structure characterized in that the above-mentioned other printed circuit board is soldered to the end face thereof. (2) When connecting a flexible printed circuit board to another printed circuit board, extend the connecting terminal pattern formed on the edge of the other printed circuit board to the end surface of the same board for each terminal pattern. The connecting terminal pattern is formed in the recess formed on the end surface, and the connecting terminal pattern is formed to extend around the end of the board to the back surface, so that the terminal pattern on the flexible printed circuit board is the same as the terminal pattern on the back surface of the other printed board. Insert it between the back side of the other printed circuit board and the other printed circuit board fixing member, and solder the corresponding terminal patterns of both circuit boards to each other at the end of the recess of the other printed circuit board. Features a printed circuit board connection structure. (3) When connecting a single-sided flexible printed circuit board to another printed circuit board, bend the connection terminal pattern formed on the single-sided flexible printed circuit board 180 degrees with the pattern side facing out, and then Align the terminal pattern with the bent terminal pattern of the flexible printed circuit board, insert it between the bent part of the flexible printed circuit board and the printed circuit board fixing member, and solder the corresponding terminal patterns of both circuit boards. A printed circuit board connection structure characterized by a connection.