JP2681717B2 - Flexible wiring member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible wiring member such as a flexible flat cable or a flexible printed wiring board.

[0002]

2. Description of the Related Art A flexible flat cable (hereinafter referred to as "FFC") will be described below as a flexible wiring member with reference to FIGS. FF
In C100, a wiring conductor 120 is laminated on a base film 110, and the base film 110 is covered with a coverlay 130.
It is composed by covering with.

When the FFC 100 is directly soldered to the printed circuit board 200, as shown in FIG.
The wiring conductor 120 of 0 is directly placed on the wiring pattern 220 formed on the printed circuit board 200. In the drawing, 300 is solder, 400 is FFC100, printed circuit board 200
Each of the adhesives is fixed to the.

[0004]

However, the conventional FFC 100 has the following problems. That is, the soldering of the FFC 100 must be performed manually unlike the normal parts, and moreover, the positioning work for the printed circuit board 200 is required, so that the productivity is extremely low. In addition, since mechanical strength is poor only by soldering, the FFC 100 must be fixed to the printed circuit board 200 with the adhesive 400.

The present invention was devised in view of the above circumstances and can be handled in the same manner as ordinary parts .
Efficient positioning work for printed circuit boards
It is an object of the present invention to provide a flexible wiring member that can be manufactured and has excellent mechanical strength.

[0006]

A flexible wiring member according to the present invention covers an insulating base film, a wiring conductor formed on the base film, and the wiring conductor. It has and a coverlay insulating, a portion where the wiring conductor is exposed from the cover lay the exposed electrode portions, bent the exposed electrode portion on the base film side, bending a the exposed electrode portions The end that was the tip before
Part of the exposed electrode part by bending it to the outside.
A stopper is provided, and the stopper is placed at the bent position.
Position the tip of the cover lay at the corresponding backside position.
You.

[0007]

1 is a plan view of an FFC according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 shows a state in which the FFC is connected to a wiring pattern of a printed circuit board. It is an explanatory view shown. It is to be noted that parts and the like that are substantially the same as those of the related art are denoted by the same reference numerals and described.

The FFC 100, which is a flexible wiring member according to this embodiment, has an insulating base film 110 and a wiring conductor 120 formed on the base film 110.
And an insulating cover lay 130 that covers the wiring conductor 120.
A portion exposed from 0 is an exposed electrode portion 140, and the exposed electrode portion 140 is bent toward the base film 110 side.

A polyimide film having flexibility and insulation is used as the base film 110. A polyimide film is also used for the coverlay 130. A polyester film can also be used.

A copper foil is used as the wiring conductor 120. The wiring conductor 120 is used in the base film 11
No. 0 is attached with an epoxy adhesive or the like. Also,
A coverlay 130 is attached on the wiring conductor 120. The tip position where this cover lay 130 is attached
Corresponds to the position of the bent portion of the stopper portion 150 described later.
It is preferable to position accurately with respect to the position on the back side
(However, there is no problem even if there is some deviation). Note that an illustration of an adhesive for bonding the base film 110, the wiring conductor 120, and the cover lay 130 is omitted.

The end of the FFC 100 is formed as an exposed electrode portion 140. That is, cover lay 1
The wiring conductor 120 is exposed by removing 30 and is bent 180 ° toward the base film 110 side, and the bent portion is fixed with an adhesive 160. Moreover, the exposure power
The extreme end, which is the pole portion 140 and which is the tip before bending, is bent outward without being fixed to the base film 110 that opposes as the stopper portion 150.

The usage and operation of the FFC 100 will be described. The printed circuit board 200 to which the FFC 100 is connected has a long hole 210 into which the FFC 100 can be inserted. The back side of the printed circuit board 200 and the long hole 21
Wiring patterns 220 to be connected are formed on both sides of 0.

The exposed electrode portion 140 of the FFC 100 is formed into the long hole 2
Insert into 10. Then, the stopper portion 150 causes the long hole 21
The edge of the coverlay 130
Since the end is hooked on the edge of the slot 210 facing the edge , the FFC 100 will not be inserted too much. Ma
Also, the long hole 210 is adjusted to the size of the exposed electrode portion 140.
Therefore, the exposed electrode portion 140 of the FFC 100 has the long hole 2
It fits closely to 10. Soldering is performed in this state. This soldering can be performed by a normal dip soldering method. That is, it becomes possible to handle the FFC 100 with the same feeling as a normal component. Also, the wiring patterns formed on both sides of the long hole 210.
And the wiring conductor 120 of the exposed electrode portion 140.
Are located in close proximity to each other,
Soldering can be performed with high reliability.

When the FFC 100 is soldered, one wiring conductor 120 is soldered to two locations on the front and back.
300 adheres. Therefore, the mechanical strength of the connecting portion is increased.

Although the FFC 100 is mentioned as an example of the wiring member having flexibility in the above-mentioned embodiments, it is needless to say that it can be applied to a flexible printed wiring board (FPC).

[0016]

The flexible wiring member according to the present invention has an insulating base film, a wiring conductor formed on the base film, and an insulating cover for covering the wiring conductor. It has and a ray, a portion where the wiring conductor is exposed from the cover lay the exposed electrode portions, bent the exposed electrode portion on the base film side, the exposed electrode
Of the exposed part at the end that was the tip before bending.
A part of the electrode part is bent outward so that a stopper part is provided.
On the back side corresponding to the position of the bent part of the stopper part.
The tip of the cover lay was positioned at the position. Therefore, the exposed electrode portion can be inserted into the elongated hole formed in the printed board, and the wiring conductor can be soldered to the wiring pattern formed around the elongated hole. This soldering can be performed by the dip soldering method like other components. Further, since one wiring conductor is soldered at two places, it is possible to increase mechanical strength as compared with the conventional one. In addition, this flexible wiring member
The stopper part when inserting it into the long hole of the printed circuit board.
And the tip of the coverlay acts as a stopper
Therefore, if the flexible wiring member is inserted into the slot,
It is possible to prevent clipping. That is, it is inserted into the slot
The vertical alignment of the flexible wiring member is
Since it is unnecessary, work efficiency is dramatically improved. In addition, this
For example, this is a dramatic improvement in work efficiency.
Vertical alignment of the flexible wiring member is short
What you can do in time, and by mistake,
When the wire member is soldered while it is inserted into the slot too much
Need to rework, but overinserted
There is no need to perform rework
Therefore, it does not require extra work time. Also,
The stopper and the tip of the cover lay strike
The size of the long hole is
The flexible layout excluding the top and coverlays.
It is set to the size of the line member. Therefore, it has the flexibility.
The wiring member to be fitted is closely fitted into the long hole. That is,
Wiring patterns provided on both ends of the long hole on the printed circuit board
And the exposed electrode portion (wiring of the flexible wiring member
The use conductors), are located in a state of being in close proximity. I
Therefore, the wiring pattern of the printed circuit board and the flexibility
Solder with (exposed wiring conductor) of the exposed electrode part of the wiring member
It can be implemented with high reliability. That is, pre
Wiring pattern of the printed circuit board and the wiring member having the flexibility
The solder does not come into contact with (the wiring conductor of) the exposed electrode of
Good quality is extremely unlikely to occur and solder strength is increased.

[Brief description of the drawings]

FIG. 1 is a plan view of an FFC according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram showing a state in which the FFC is connected to a wiring pattern on a printed board.

FIG. 4 is a plan view of a conventional FFC connected to a printed circuit board.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

 100 FFC 110 Base film 120 Wiring conductor 130 Coverlay 140 Exposed electrode

Claims (1)

(57) [Claims] 1. An insulating base film, a wiring conductor formed on the base film, and an insulating cover lay for covering the wiring conductor,
The portion where the wiring conductor is exposed from the cover lay the exposed electrode portions, bent the exposed electrode portion on the base film side, those
At the exposed electrode part, which was the tip before bending
Is a stopper that bends a part of the exposed electrode part to the outside.
Is provided to correspond to the position of the bent part of the stopper part.
A flexible wiring member characterized in that the tip of the cover lay is located at a position on the back surface side .