JPS5896797A - Device for connecting flexible printed board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection device that connects a circuit on a flexible printed circuit board to another circuit using a hard board portion with a plurality of terminals embedded therein, and improves workability. This provides a device that is low in cost and highly reliable.

A conventional connection device of this type is constructed as shown in FIGS. 1 to 4. In other words, in the case of Figures 1 and 2,
It connects the circuits of a flexible printed circuit board and a rigid printed wiring board, and as shown in Figure 1a, the peripheral part is connected and held in a frame-shaped rigid board part 1 so that it can be separated, and dip soldering is performed. Preliminary solder 4 is provided on a conductor 3 provided on an insulator 2 of a flexible printed circuit board to which chip components (not shown) are soldered, as shown in FIG. 2a,
A through hole 5 is provided there, and preliminary solder 8 is provided on the conductor 7 provided on the insulator 6 of the hard printed wiring board.
8, and insert the tip 9 of the soldering iron through the through hole 5 so that the tip 9 touches the preliminary solder 8. By melting the preliminary solder 4 and 8, the connection is made as shown in Figure 2. Was. However, in this case, the preliminary solder 4
The soldering process of thermally melting the 8°C was a separate process from the solder dipping of printed wiring boards, required large-scale dedicated jigs and tools, took a lot of man-hours, and was not very efficient. Furthermore, the solder surfaces only make surface contact, and the adhesive strength is weak, necessitating the use of separate parts such as eyelets for protection.

Next, a conventional structure for connecting a connector to a flexible printed circuit board will be described with reference to FIGS. 3 and 4. That is, what is shown in FIG. 3 is a flexible printed circuit board 1.
The terminal part 14 is fixed to the exposed conductor part 13 of the conductor part 12 of the first conductor part 12 by solder 15, after which the cover is peeled off, and the terminal part 14 is then assembled into the nouji puffer 16, and the one shown in FIG. The terminal member 14 is crimped onto the conductor exposed portion 13 of the flexible printed circuit board 11, and then assembled into the Ujifugu 16.

However, as described above, in the connector 17,
Since the terminal member 14 for electrical connection with a mating connector (not shown) must be soldered or crimped to the conductor exposed portion 13 of the extremely thin flexible printed circuit board 11, the assembly is labor-intensive. Furthermore, even after they are assembled, the bonding force between the terminal member 14 and the exposed conductor portion 13 is weak, so the terminal member 14 is not stable, and therefore a good contact state cannot be obtained when mating with the mating connector. There was a drawback that there was no Furthermore, the terminal member 14
When the flexible printed circuit board 11 is attached in the housing 16, if some force is applied to the flexible printed circuit board 11 and it is pulled backwards, or in the opposite direction to the protruding direction of the terminal parts 14, the terminal parts 14 will be exposed as conductors. There was also the drawback of removing it from Part 13. In addition, although the assembly workability and serviceability are improved compared to the one shown in Figure 2 above, the connection between the connector terminal part and the flexible printed circuit board requires a complicated preparation process, which requires a lot of man-hours and is expensive. Met.

The present invention eliminates these conventional drawbacks, and simplifies assembly work and ensures reliable contact by inserting automatic insertion terminals into the hard board holding the flexible printed circuit board to connect the circuit. It is an object of the present invention to provide a flexible printed circuit board connection device that can maintain its condition.

An embodiment of the present invention will be described below with reference to FIGS. 6 and 7. FIG. 5a is a front view of a printed circuit board used in one embodiment of the present invention, and the same figure is the same as that of FIG. It is a sectional view taken along the cutting line -B. Figure 6a.

b is a perspective view of the connecting device of the invention. Also, Figure 7a,
b is a sectional view showing a state in which the connecting device of the present invention is connected to another circuit (a rigid printed circuit board, a flexible printed circuit board, etc.);

The printed circuit board used in the present invention includes an insulator 21 (for example, a plastic film, etc.) of a flexible printed circuit board, and a hard substrate 22 (for example, a laminated Although not shown in the drawings, various chip parts and the like are connected by soldering on an extension of the copper foil pattern 23 of the flexible printed circuit board to form an electric circuit. In the present invention, the hard board 22 that holds the peripheral part of the flexible printed circuit board at a plurality of locations is utilized, and the copper foil pattern 23 of the flexible printed circuit board is extended to the hard board 22, and the hard board 22 and A plurality of insertion holes 24 are provided so as to penetrate through the copper foil pattern 23, and connection terminals 25 are inserted into the insertion holes 24.

Next, apply normal solder dip processing. This terminal 2
6 is electrically connected to the copper foil pattern 23 by solder 26. After that, perforations 27 provided in the hard substrate part 22
The connection part 22 with the flexible printed circuit board is
Divide.

6a and 6b show a state in which the connecting portion 22a is divided and a state in which different connecting terminals 26 are inserted. FIG. 6a shows an example in which a linear connecting terminal 25& is used as the connecting terminal, while FIG.
This is an example using .

Figures 7a and 7b show how the flexible printed circuit board is connected to other circuits.

FIG. 7a shows a case in which connection is made to a rigid printed wiring board 28 using a straight connecting terminal 25&, in which the connecting terminal 25& is inserted into a through hole 29 provided in the rigid printed wiring board 28, and The copper foil pattern 3o and solder are connected. On the other hand, Fig. 7 t) is an example in which a FiL-shaped connection terminal 25b is used, and the tip of the connection terminal 25b is inserted into the through hole 29 provided in the hard printed wiring board 28 as in Fig. 7a. The copper foil pattern 30 and the half date are connected.

Incidentally, instead of directly soldering to the other copper foil pattern 30 in this way, a female connector (not shown) may be provided on the two sides of the hard printed wiring board, and the connection may be made by inserting into this female connector. good.

According to the above-mentioned connection device, the connection terminal 25 is inserted into the insertion hole 24 provided to penetrate the hard board and the flexible printed circuit board and dip soldered, thereby forming the connection part with other circuits. can,
It becomes possible to perform dip soldering at the same time as soldering other parts without using special large-scale jigs and tools, improving work efficiency. Furthermore, the bonding force of the connecting terminal 25 to the flexible printed circuit board is stronger than in the case of FIGS. , its practical effects are extremely large.

As described above, according to the flexible printed circuit board connection device of the present invention, the copper foil pattern of the flexible printed circuit board is extended to the hard board with a trench, and the terminal insertion hole is inserted through the hard board and the copper foil pattern. By inserting a connection terminal into this insertion hole and soldering it to the copper foil pattern to form a connection part with other circuits, it can be used exclusively as a connection point for flexible printed circuit boards, which was a drawback of the conventional example. This connecting device does not require the use of large-scale jigs or tools, nor does it require a complicated preparation process for connecting connector terminals, which simplifies assembly work, lowers costs, and has excellent reliability. This is something that can be provided. Furthermore, it is possible to maintain a good connection state by eliminating cracks in the connection portion of the connection terminal with the printed circuit board.

[Brief explanation of the drawing]

FIGS. 1a and 1b are front views of a conventional printed circuit board. 2A and 2B are explanatory diagrams of a conventional method of connecting a flexible printed circuit board, FIGS. 3 and 4 are exploded perspective views of a state in which a connector is connected to a conventional flexible printed circuit board, and FIG. Figures a and b are a front view and a sectional view of a printed circuit board used in a flexible printed circuit board connection device according to an embodiment of the present invention, and Figures 6a and b are perspective views showing mutually different examples of the connection device of the present invention. Figure 7a
, b are cross-sectional views for explaining a method of connecting to other circuits using the connecting device of the present invention. 21... Insulator of flexible printed circuit board,
22... Hard board, 23... Copper foil pattern of flexible printed circuit board, 24... Terminal insertion hole, 26... Connection terminal, 26...・・・
・Solder, 27...Perforated hole, 28...
. . . Hard printed wiring board for other circuits, 29 . . . Terminal insertion hole, 30 . . . Copper foil pattern for other circuits. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
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Claims (1)

[Claims] A copper foil pattern of a flexible printed circuit board whose periphery is connected and held to a hard board is extended to the hard board, and a terminal insertion hole is provided by penetrating the hard board and the copper foil pattern located on this hard board, and this insertion A flexible printed circuit board characterized in that a connecting terminal is inserted into the hole and soldering is performed, and a part of the hard board connected to the flexible printed circuit board and into which the connecting terminal is inserted is divided from other parts. connection device.