KR101185622B1

KR101185622B1 - A ffc structure using conductive paste

Info

Publication number: KR101185622B1
Application number: KR20100112311A
Authority: KR
Inventors: 최용석
Original assignee: 최용석
Priority date: 2010-11-11
Filing date: 2010-11-11
Publication date: 2012-09-24
Also published as: KR20120050852A

Abstract

The present invention relates to a double-sided FFC using a conductive paste, the conductive electrode is formed on both sides around the base film so that the distance between the electrodes can be reduced, and by using the conductive paste to form a conductive electrode This is to improve the accuracy of the electrode pattern.
In the FFC of the present invention for realizing this, a plurality of conductive electrodes 20 and 20 'formed by printing a conductive paste on the upper and lower surfaces of the base film 10 are provided at regular intervals; Both sides of the base film 10 is characterized in that the cover film 30 for preventing the external exposure of the conductive electrode (20, 20 ') is configured, respectively.

Description

Double sided FFC with conductive paste {A FFC STRUCTURE USING CONDUCTIVE PASTE}

The present invention relates to an FFC (Flexibe Flat Cable), and more particularly, the electrode of the FFC can be formed on both sides by a conductive paste printing method to improve the reliability of the product while reducing the width of the cable. It is to make it possible.

In general, almost all electronic products such as monitors, PCs, telephones, and the like are thinner for printed circuit boards (PCBs) having various circuit patterns and electrical signals between the PCBs or electrical signals between the PCBs and components. An FFC in the form of a plate is used to electrically connect between the PCB and the PCB or between the PCB and peripheral components.

1 and 2 show the structure of such a conventional FFC, the copper wire (3) forming the electrode portion between the lower film 1 and the upper film 2, the adhesive layer (1a, 2a) is applied on one surface, respectively And a flat cable type FFC was produced by pressing on both sides.

However, in the conventional manufacturing process of the FFC, the lower film (1), the upper film (2) and the copper wire (3) is gradually released in the state of being wound on one side, respectively, the supply is made, the copper wire (3) If the case is finely thin, there was a problem that is easily broken during the release process.

In addition, due to supply of the winding method of the copper wire 3, manufacturing costs are increased, the process is complicated, and there is a problem that adversely affects flexibility due to the increase in the thickness of the FFC.

Conventional FFC has a problem in that a plurality of adjacent conductive electrodes to maintain a certain distance from each other to prevent electrical contact between each other, there is a limit in reducing the width of the FFC.

The present invention has been proposed to improve the above problems in the prior art, by forming the electrode by a printing method rather than the conventional copper winding method by preventing the occurrence of defects due to the pattern is broken during the manufacturing process The aim is to reduce manufacturing costs through simplification and to increase the flexibility of reducing thickness.

In addition, the purpose is to reduce the width of the FFC by forming the electrode in a double-sided form.

Double-sided FFC of the present invention for achieving the above object is provided with a plurality of conductive electrodes formed by printing a conductive paste on the upper and lower surfaces of the base film at regular intervals; Both sides of the base film is characterized in that each cover film is configured to prevent the external exposure of the conductive electrode.

In the FFC of the present invention, since the conductive electrodes are formed on both sides of the base film, the inter-electrode spacing can be reduced, thereby reducing the overall width of the FFC.

In particular, by forming a conductive electrode using a conductive paste without using a conventional copper wire, the manufacturing process is shortened and defects caused by disconnection of the electrode in the manufacturing process can be prevented.

In addition, since the pitch of the electrode can be formed more precisely, the production quality and cost are reduced.

Figure 1 shows a side cross-sectional view of the FFC structure in the prior art,
1a is an isolated state diagram.
1b is a laminating state diagram.
Figure 2 is a front cross-sectional view of the FFC in the prior art,
2a is an isolated state diagram.
2b is a laminating state.
Figure 3 is a front view of the FFC isolation state in the present invention.
Figure 4 is a front view of the FFC coupled state in the present invention.
5 is an enlarged view of an electrode arrangement state of the present invention FFC.
Figure 6 is a side view of the FFC separation state in the present invention.
Figure 7 is a side view of the FFC binding state in the present invention.
8 is a cross-sectional view of the cut unit of the length unit of the present invention FFC.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, looking at the structure of the bi-directional FFC according to an embodiment of the present invention, a plurality of conductive electrodes (20, 20 ') on the upper surface and the lower surface with respect to the base film 10, respectively provided at a predetermined interval at a mutually intersecting position On both sides of the base film 10, the cover films 30 are attached to prevent the external exposure of the conductive electrodes 20 and 20 ', respectively.

That is, the lower conductive electrode 20 'is formed on the lower surface of the base film 10 at a position corresponding to the middle of the gap between the conductive electrodes 20 formed on the upper surface, thereby substantially conducting the conductive electrodes 20 and 20'. Interval (D) is to reduce the effect by 1/2 compared to the existing.

In particular, the conductive electrodes 20 and 20 'configured as described above are formed by printing a conductive paste in the form of stripes on the upper and lower surfaces of the base film 10, and the conductive paste used has a silver filler content of 50 to 50. In the present embodiment, a composition containing a binder content in a range of 30 to 50% by weight is used. In this embodiment, the binder is based on 100% by weight of 40% by weight of a solid content, 45% by weight of a diluting solvent, and an additive. 15% by weight of the mixture was used.

Meanwhile, the conductive paste may be a copper filler or a silver-coated filler or a conductive material, such as copper, nickel, and cobalt, in addition to the silver filler.

In addition, in order to improve the printing quality of the paste composition and prevent cracking of the printed conductive electrodes 20 and 20 ', MMA (Methyl MethacrylAte), which is a water dispersible acrylic emulsion, and a phosphate ester type emulsifier, which is a reactive surfactant, are added. This is preferred.

That is, in this case, it is preferable that the mixing is performed at a ratio of 55% by weight of silver filler, 35% by weight of binder, 7% by weight of MMA, and 3% by weight of emulsifier.

In addition, as a printing technique, a conventional gravure printing, inkjet printing, offset printing, silkscreen printing, rotary screen printing, and flexographic printing may be selected and performed.

On the other hand, the cover film 30 is laminated on the outer surface in order to prevent external exposure of the conductive electrodes (20, 20 ') is a through hole 31 is punched at a predetermined interval during the supply process for laminating Laminating is made with the base film 10 in the formed state.

Accordingly, the film is cut along the through-hole 31 forming portion, thereby completing the fabrication of the double-sided FFC in which the conductive electrodes 20 and 20 'are exposed on both sides as shown in FIG. 8.

Therefore, by forming a double-sided electrode forming structure as in the present invention, it is possible to reduce the overall width of the FFC and to achieve the precision of the electrode pattern using the conductive paste, thereby improving the quality of the product.

10: base film 20,20 ': conductive electrode
30: cover film 31: through hole

Claims

The upper and lower surfaces of the base film 10 are provided with a plurality of conductive electrodes 20 and 20 'formed by printing a conductive paste at predetermined intervals, and the conductive electrodes 20 and 20 are provided on both sides of the base film 10. In the double-sided FFC using a conductive paste each composed of a cover film 30 to prevent external exposure of '),
The conductive electrodes 20 and 20 'provided at both sides are provided at positions crossing each other;
The cover film 30 is formed with a through hole 31 is punched at a predetermined interval, the cutting is made at regular intervals along the portion of the through hole 31;
The conductive paste for forming the conductive electrodes 20 and 20 'has a conductive filler content of 50 to 70 wt% and a binder content of 30 to 50 wt%;
MFC (Methyl MethacrylAte), which is a water-dispersible acrylic emulsion, and a phosphate ester type emulsifier, which is a reactive surfactant, are further added to the conductive paste.

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