JPS61143903A - Flexible cord - 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 Field of the Invention The present invention relates to a flexible cord that connects a wiring pattern provided on a printed circuit board and an external terminal.

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 in that the number of connections is limited. Also,
The width W of the flexible cord 3 is also limited if the width of the conductive pattern 4 and the pattern spacing are determined.

Conventionally, it has been difficult to use a single-sided flexible cord on a board with a large number of connections and a limited area width for soldering in the negative row.

Therefore, in such a case, it is possible to solder the flexible cord and the board in two rows and use a double-sided flexible cord, but the double-sided flexible cord has a conductive pattern with a two-layer structure, etc. generally more expensive.

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

Means for Solving the Problems In order to solve the above-mentioned problems, the flexible cord of the present invention has a flexible cord that connects one side of a flexible insulating film from each different end of the insulating film to approximately the center of the insulating film. A structure is adopted in which first and second conductive pattern groups are formed that extend up to a portion of the insulating film, and the first and second conductive pattern groups are folded back at a central portion of the insulating film adjacent to each other.

For example, when two rows of solder on a printed circuit board connect an area and a flexible cord, the two ends of the flexible cord are soldered to the area and the folded part is connected to, for example, a connector. do. 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, allowing two-row soldering. In addition, since it has a single-sided flexible cord structure, it can be manufactured at low cost.
The code width also becomes narrower.

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 first conductive pattern group 11 consisting of conductive patterns lla to 11e on one surface 10a of a flexible insulating film 10 having a predetermined shape, and a conductive pattern group 11 consisting of conductive patterns lla to 11e. A second conductive pattern group 12 consisting of conductive patterns 122 to 12e is formed.

Conductive patterns lla to 11e.

12a to 1243 are made of thin copper, 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 group 12 extends from one end of the insulating film 10 to the center thereof.
It also extends from the other end to approximately the center, and both pattern groups are adjacent to each other over a predetermined section at the center. Adhesive or pressure-sensitive adhesive is applied to the other surface 10b of the central portion of the insulating film 1O where the first and second conductive pattern groups 11, 12 are adjacent to each other, and the first and second conductive pattern groups 11. It has a heavy structure. Further, near the ends of the conductive patterns lla to lie and 12a to 12e, solder plating 13a is applied to facilitate soldering.
13e, 14a-14e are applied, and solder plating 15a-15j is also applied on the conductive patterns 11e, 12a-12e of the folded portion to facilitate connection with a flexible connector. Of course, a structure may be adopted in which such solder plating is omitted.

FIG. 3 is a sectional view taken along the line X-X in FIGS. 1 and 2,
The same reference numerals as in FIGS. 1 and 2 indicate the same parts, and 16.
17 is an adhesive, 18 is a cover film, and 19 is a reinforcing plate. A copper thin film constituting a conductive pattern llc is pasted on an insulating film lo with an adhesive 16, and an insulating cover film 18 is applied thereon except for the solder plating 15e area. The reinforcing plate 19 is for increasing the mechanical strength of the folded portion, and both surfaces and one side surface are adhered to the back surface 10b of the insulating film 10 with an adhesive 17. Note that a configuration may be adopted in which the reinforcing plate 19 is omitted.

FIG. 4 is a cross-sectional view taken along the Y-Y line in FIGS.
A thin copper layer constituting lb is attached, and a cover film 18 is attached to the area excluding the solder plating 13b.

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. 5(a)] First, a thin copper layer is attached with adhesive 16 to the entire surface of one side of an insulating film 10 having a predetermined shape.

[See FIG. 5(b)] Next, a part of the copper thin film 20 is removed by etching or the like to pattern the copper thin film, forming conductive patterns lla to
11e, 12a to 12e are formed. The adhesive 16 under the removed copper thin film is also removed at the same time.

[See FIG. 5(C)] Next, a cover film 18 is applied to the entire surface of one side of the insulating film 10 excluding the area to be solder plated.

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

[See FIG. 5(e).] 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 completing the process of FIG. A flexible cord having the structure shown in FIGS. 1 and 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 the flexible connector and the two ends are connected by soldering, but the folded part can also be connected to other terminals by soldering, and the two ends can be connected by soldering. Both or one of the ends can also be connected 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 cross-sectional view of FIG. In FIG. 8, the same reference numerals as in FIG. 4 indicate the same parts, and 32 indicates the reinforcing plate 31.
This is an adhesive for attaching the film to the insulating film 10.

As described in detail, the flexible cord of the present invention enables two-row soldering, which is effective for boards with narrow soldering areas, and is easier to manufacture than conventional double-sided flexible cords. It has the advantage of being simple and having low manufacturing costs. Further, there is an advantage that the cord width can be narrower than the conventional single-sided flexible cord.

[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,
Figure 3 is a sectional view taken along line X-X in Figures 1 and 2, Figure 4 is a sectional view taken along line Y-Y in Figures 1 and 2, and Figure 5 is a sectional view taken along line Y-Y in Figures 1 and 2.
6 is a plan view of the flexible cord after completing the process shown in FIG. 5(e). FIG. External perspective view showing the attached state, No. 8
The figure is a cross-sectional view showing another embodiment of the end of the flexible cord, and FIG. 9 is a diagram showing the state of connection between the conventional flexible cord and the board. 10 is an insulating film, 11 is a first conductive pattern group, 1
2 is a second conductive pattern group, and 16 is an adhesive.

Claims (1)

[Claims] First and second conductive pattern groups extending from different ends of the insulating film to approximately the center of the insulating film are formed on one surface of the flexible insulating film; A flexible cord having a structure in which conductive pattern groups are folded back at the center of the insulating film adjacent to each other.