JPH039566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flexible cord that connects a wiring pattern provided on a printed circuit board to an external terminal or the like.

2. Description of the Related Art As a method of connecting a wiring pattern provided on a printed circuit board and an external terminal, there is a method of using a flexible cord.

Conventionally, the wiring pattern and the flexible cord are connected by soldering the wiring pattern 2 on the printed circuit board 1 and the conductive pattern 4 of the single-sided flexible cord 3 in a substantially straight line using solder 5, as shown in FIG. 9, for example. I was wearing it. Therefore, once the board width and soldering pitch are determined, there is a problem that the number of connections is limited. Further, the width W of the flexible cord 3 is also limited if the width of the conductive pattern 4 and the pattern interval are determined.

Conventionally, it has been difficult to use single-sided flexible cords on boards where the number of connections is large and the width of the soldering area that can be soldered in a row is limited. Therefore, in such a case, it is possible to use a double-sided flexible cord with two rows of soldering points between the flexible cord and the board, but the double-sided flexible cord has two conductive patterns.
It is generally expensive due to its layered structure.

Problems to be Solved by the Invention The present invention solves these conventional problems, and its purpose is to provide an inexpensive and effective two-row soldering method for boards with narrow soldering area widths. The purpose is to provide a single-sided flexible cord with a narrow cord width.

Means for Solving the Problems The flexible cord of the present invention is provided on one side of a flexible insulating film from different ends of the insulating film to beyond the center of the insulating film and not overlapping each other. The first and second conductive pattern groups are formed so as to extend as shown in FIG. be.

Function For example, when connecting two rows of soldering areas on a printed circuit board with a flexible cord, the two ends of the flexible cord are soldered to the two rows of soldering areas, and the folded portion is connected to, for example, a connector. . From the folded portion, a first conductive pattern group extends toward one end of the flexible cord, and a second conductive pattern group extends toward the other end, making it possible to perform two-row soldering. Furthermore, since it has a single-sided flexible cord structure, it can be manufactured at low cost, and the cord width is also narrow.

Embodiment FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a bottom view thereof. As shown in the figure, the flexible cord of this embodiment has a conductive pattern 1 on one side 10a of a flexible insulating film 10 having a predetermined shape.
A first conductive pattern group consisting of 1a to 11e,
A second conductive pattern group 12 consisting of conductive patterns 12a to 12e is formed. The conductive patterns 11a to 11e and 12a to 12e are made of copper foil, for example. The first conductive pattern group 11 extends from one end of the insulating film 10 to the center thereof, and the second conductive pattern 12 extends from the other end of the insulating film 10 to approximately the center, and in the center, both pattern groups extend over a predetermined section. Adjacent to the whole area. Adhesive or pressure-sensitive adhesive is applied to the other surface 10b of the central portion of the insulating film 10 where the first and second conductive pattern groups 11 and 12 are adjacent to each other, and the two conductive pattern groups 11 and 12 are folded back at approximately the center of the adjacent portions. It has a heavy structure. Further, conductive patterns 11a to 1
1e, 12a to 12e have solder plating 13a to 13e, 1 near the ends to facilitate soldering.
4a to 14e, and solder plating 15a to 15j is also applied to the folded portions of the conductive patterns 11a to 11e and 12a to 12e in order to facilitate connection with the flexible connector. Of course, a structure may be adopted in which such solder plating is omitted.

FIG. 3 is a cross-sectional view taken along line X-X in FIGS. 1 and 2, in which the same symbols as in FIGS. 1 and 2 indicate the same parts, 16 and 17 are adhesives, 18 is a cover film, 19 is a reinforcing plate. The copper foil constituting the conductive pattern 11c on the insulating film 10 is attached to the adhesive 16.
An insulating cover film 18 is applied thereon except for the solder plating 15e. The reinforcing plate 19 is for increasing the mechanical strength of the folded part, and both sides and one side are coated with adhesive 1.
7 to adhere to the back surface 10b of the insulating film 10. Note that a configuration may be adopted in which the reinforcing plate 19 is omitted.

FIG. 4 is a sectional view taken along the Y-Y line in FIGS. 1 and 2, in which the copper foil constituting the conductive pattern 11b is pasted on the insulating film 10 with an adhesive 16,
Cover film 1 is applied to the area excluding solder plating 13b.
8 is attached.

Next, an example of the method for manufacturing the flexible cord of this embodiment will be explained based on FIGS. 5 and 6.

[See FIG. 5a] First, a copper foil 20 is attached to the entire surface of one side of an insulating film 10 having a predetermined shape using an adhesive 16.

[See FIG. 5b] Next, a portion of the copper foil 20 is removed by etching or the like to pattern the copper foil to form conductive patterns 11a to 11e and 12a to 12e. The adhesive 16 under the removed copper foil is also removed at the same time.

[See FIG. 5c] Next, a cover film 18 is applied to the entire surface of one side of the insulating film 10 excluding the area to be soldered.

[See FIG. 5d] Next, solder plating 21 is applied to the copper foil portions at both ends of the insulating film 10 and the copper foil portion at the center.

[See FIG. 5e] Next, an adhesive 17 is applied to the central part of the back surface of the insulating film 10, and a reinforcing plate 19 is attached to a part of the adhesive 17.

FIG. 6 is a plan view of the flexible cord after the process shown in FIG. A flexible cord having the structure shown in FIG. 2 is obtained.

FIG. 7 is an external perspective view showing the state in which the flexible cord of the above embodiment is soldered to the board 1, and the solder-plated parts at both ends of the flexible cord are soldered to the wiring pattern 2 provided on the board 1. Connect by 30. Due to its flexibility, it is possible to easily solder in two rows even in a narrow soldering area.

In the above embodiment, the folded part is connected to a flexible connector and the two ends are connected by soldering, but the folded part can also be used to connect to other terminals by soldering. It is also possible to connect both or one of the two ends to a flexible connector. When connecting the end portion to a flexible connector, it is desirable to bend the end portion and interpose a reinforcing plate 31, as shown in the sectional view of FIG. In addition, in FIG. 8, the same reference numerals as in FIG. 4 indicate the same parts, and 32
is an adhesive for attaching the reinforcing plate 31 to the insulating film 10.

Effects of the Invention As explained above, the flexible cord of the present invention enables effective two-row soldering to a board with a narrow soldering area, and is easier to manufacture than the conventional double-sided flexible cord. This has the advantage of low manufacturing cost. Further, there is an advantage that the cord width can be narrower than the conventional single-sided flexible cord. In addition, since the first and second conductive patterns are formed beyond the center of the insulating film so as not to overlap each other, and are folded back at the center of the insulating film, the folded portion is thick. In addition, the folded part has the force to return, so when used to connect a connector, the contact is stable, and since the same pattern exists on both sides of this folded part, when used to connect a connector, the contact point is stable. There are two points, and even when connected by soldering, the welding area increases, so poor contact is prevented.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a bottom view thereof, FIG. 3 is a sectional view taken along line X-X in FIGS. 1 and 2, and FIG. Y-Y in Figure 2
5 is a process explanatory diagram of the flexible cord manufacturing method of the present invention, FIG. 6 is a plan view of the flexible cord after the process shown in FIG. FIG. 8 is a cross-sectional view showing another embodiment of the end of the flexible cord. FIG. 9 is a diagram showing the conventional connection between the flexible cord and the substrate. It is a diagram. 10 is an insulating film, 11 is a first conductive pattern group, 12 is a second conductive pattern group, and 16 is an adhesive.

Claims (1)

[Claims] 1 Formed on one surface of a flexible insulating film are first and second conductive pattern groups extending from different ends of the insulating film beyond the center of the insulating film and not overlapping each other. A flexible cord having a structure in which the first and second conductive pattern groups are folded back at the center of the adjacent insulating film.