JP4281271B2 - Electric wire terminal connection structure and connection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wire terminal connection structure and a connection method, and in particular, it is possible to connect a fine cable or a fine coaxial cable at a narrow pitch, such as around a liquid crystal display of a personal computer or a display of an ultrasonic diagnostic apparatus. The present invention relates to a wire terminal connection structure and a connection method in a required portion.
[0002]
[Prior art]
Conventionally, a flexible printed circuit board (FPC) has been used as a wiring material of a liquid crystal display (LCD) used for a notebook personal computer or the like.
[0003]
By the way, in recent years, the demands for thinning, downsizing, lightening, and high image quality of notebook personal computers have become very high, and as a result, a plurality of extra-fine cables or An ultra-fine coaxial cable is connected to the above-mentioned flexible printed circuit board (FPC) at an extremely narrow pitch.
[0004]
Conventionally, for example, when connecting a plurality of extra fine cables to an FPC 30 provided with a plurality of connecting terminals 31, 31... Arranged at a pitch p = 0.5 mm as shown in FIG. As shown, a plurality of extra-fine cables 33, 33,... Are arranged corresponding to each connection terminal 31 to be connected, and the extra-fine cable 33 is fixed by adhering an adhesive tape 34 from the upper and lower sides (front and rear direction in the drawing). . Then, the adhesive tape 34 and the insulator 35 at the end of the ultrafine cable 33 are removed to expose the conductor 36 of each ultrafine cable 33. At this time, each conductor 36 is in an irregular line state as shown in the figure.
[0005]
Next, as shown in FIG. 9, the conductors 36 of the respective ultrafine cables 33 are aligned with a predetermined pitch (0.5 mm) in accordance with the connection terminals 31 of the FPC 30, and thereafter, as shown in FIG. The conductor 36 is connected to the connection terminal 31 to be connected by soldering or the like.
[0006]
[Problems to be solved by the invention]
However, in such a conventional terminal connection structure and connection method, there has been a problem that it takes time to wire an extremely thin conductor, resulting in poor production efficiency. In addition, since solder connection is performed at an extremely narrow pitch, there is a problem that electrical defects such as short circuits are likely to occur frequently.
[0007]
These problems are not limited only to the flexible printed circuit board (FPC), but also occur when an ultrafine cable or an ultrafine coaxial cable is connected to a printed circuit board (PCB), a connector terminal, or the like.
[0008]
Therefore, the object of the present invention is to solve the above-mentioned problems, and can easily and quickly connect without requiring the work of arranging the conductor of the electric wire, and at the same time end connection of the electric wire that enables a good connection without causing an electrical failure It is in providing a partial structure and a connection method.
[0009]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a connecting common pad for connecting a plurality of electric wires to a connecting terminal, and connecting each end of the connecting terminal to the connecting terminals. Forming a portion, and arranging the plurality of electric wires corresponding to each connection terminal to be connected, removing the insulator at the end portion to expose the conductor, the conductor of the plurality of electric wires After connecting to the connecting common pad part, the connecting common pad part is electrically insulated from the connecting part between the adjacent connecting terminal and the electric wire by cutting and removing the portion located between each connecting terminal and each electric wire. It is what you do.
[0010]
According to this configuration, the conductors of the ultra-thin cables can be connected to the common pad portion for connection all at once without adjusting the wires, so that the operation of adjusting the conductors is not necessary and the connection can be performed easily and quickly. Can do. In addition, after connecting the conductor of the extra-fine cable to the connecting common pad portion, the portions located between the connection terminals and the electric wires are cut and removed to electrically insulate, resulting in an electrical failure such as a short circuit. And good connection can be made.
[0011]
The conductor of the electric wire may be connected to the common pad portion for connection by soldering, welding, or thermocompression bonding.
[0012]
The common pad for connection may be cut and removed by irradiating laser light.
[0013]
Furthermore, the present invention provides a terminal connection method for connecting a plurality of electric wires to connection terminals, respectively, wherein each connection terminal is formed with a common pad portion for connection that collectively connects each end thereof, The wires are arranged corresponding to each connection terminal to be connected, the insulator at the end is removed to expose the conductor, and the conductors of the plurality of wires are connected to the common pad portion for connection. After that, the common pad portion for connection is formed by cutting and removing the portion located between each connection terminal and each electric wire to electrically insulate the connection portion between the adjacent connection terminal and the electric wire. .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0015]
FIGS. 1-6 is explanatory drawing for demonstrating the terminal connection part structure and connection method of the electric wire which concern on this embodiment, and connects a some extra fine cable with respect to a flexible printed circuit board (FPC). .
[0016]
First, the ultrafine cable (electric wire) of this embodiment is demonstrated using FIG.
[0017]
FIG. 1 shows a cross section of an extra-fine cable 1. The extra-fine cable 1 is a conductor 3 (diameter d2 = 0.09 mm) formed by twisting seven tin-plated copper alloy wires 2 having a diameter d1 = 0.03 mm. Is coated with an insulating layer 4 made of fluororesin (PFA) having a thickness of 0.08 mm, and the outer diameter D is 0.25 mm.
[0018]
On the other hand, as shown in FIG. 2, the flexible printed circuit board (FPC) 7 to which the extra fine cable 1 is connected is provided with wiring parts 9, 9... The connection terminals 10, 10... Formed at the end portions and the connection common pad portions 11 that collectively connect the end portions of the connection terminals 10 are provided. The wiring part 9, the connection terminal 10, and the connection common pad part 11 are integrally formed of the same material, and are formed of a conductor such as a thin copper plate, for example. In the present embodiment, the connection terminals 10 are arranged with a pitch P1 = 0.5 mm.
[0019]
When connecting the ultrafine cable 1 shown in FIG. 1 to each connection terminal 10 of the FPC 7, first, as shown in FIG. 3, the same number (for example, 12) of ultrafine cables 1 as the connection terminals 10 are provided. , 1... Are arranged in parallel at a pitch P2 = 0.5 mm equal to the connection terminals 10 in correspondence with the connection terminals 10 to be connected, and adhesive tapes 15 are attached from the upper and lower sides (the front-rear direction in the drawing) to each ultrafine cable. 1 is fixed integrally. The tape-like cable 16 thus obtained is cut to a length L = 300 mm, for example. Next, a slit is formed by irradiating a CO ₂ laser beam in the width direction of the cable 16 at a predetermined distance l = 2 mm from each end of the cable 16, so that the adhesive tape 15 and the ultrafine cable 1 at the end of the cable 16 are slit. The insulating layer 4 is peeled and removed to expose the conductors 3, 3. At this time, each conductor 3 is in a state where it is not trimmed as shown in the figure.
[0020]
Then, each exposed conductor 3 is immersed in a solder bath, and preliminary solder is applied. At this time, a bridge connecting conductors may be generated.
[0021]
Next, as shown in FIG. 4, the conductors 3 of the ultrafine cable 1 are soldered (connected) to the common pad portion 11 for connection of the FPC 7 using a heat pulse batch soldering device or the like while the irregular wires are left. .
[0022]
And, as shown by the hatched portion A in FIG. 5, the connection common pad portion 11 to which the conductor 3 of each ultrafine cable 1 is solder-connected, and the portion located between each connection terminal 10 and each wire 1, and Laser light is applied to the portions located at both ends in the width direction, and the connecting common pad portion 11, the solder material, and the conductor 3 located at the portion A are cut and removed. As a result, as shown in FIG. 6, the terminal connection part structure which has the connection part 20 which connects each connection terminal 10 and each electric wire 1 each is formed, and each adjacent connection part is electrically insulated. . In the present embodiment, the connection portion 20 has a width w of 0.3 mm, a pitch P3 of 0.5 mm, and an interval H between the connection portions of 0.2 mm.
[0023]
Thus, according to the terminal connection part structure and connection method of the electric wire of the present invention, the conductors 3 of the respective ultrafine cables 1 can be collectively connected to the connecting common pad part 11 without straightening, It is not necessary to wire the conductor 3, and the connection can be made easily and quickly.
[0024]
In addition, after connecting the conductor 3 of the ultrafine cable 1 to the connecting common pad portion 11, the portions located between the connection terminals 10 and the electric wires 1 are cut and removed to electrically insulate, so that a short circuit or the like An electrical failure does not occur and a good connection can be made. Note that some of the conductors 1 are located across the adjacent connecting portions 20 like the conductor 3 of the second electric wire from the top in FIG. 5, for example. Since the part A located between the connection terminal 10 and the electric wires 1 is cut by irradiating light, a short circuit does not occur.
[0025]
From the above, according to the present invention, it is possible to shorten the connection processing time, improve the productivity, and improve the yield, and provide a good quality and low cost electric wire processed product.
[0026]
So far, the ultrafine cable has been described, but the present invention is not limited in this respect, and can be applied to other types of electric wires such as an ultrafine coaxial cable.
[0027]
Moreover, although the case where an extra fine cable is connected with respect to a flexible printed circuit board (FPC) was demonstrated, this invention is applicable also when connecting an electric wire to a printed circuit board (PCB), a connector, etc.
[0028]
In addition, although it has been described that the common pad portion for connection is cut and removed by irradiating the laser beam, the present invention has no restriction on the cutting method of the common pad portion for connection, and a laser processing machine, a cutting die, a polishing machine, etc. You may cut using.
[0029]
Furthermore, although it has been described that the conductor of the electric wire is connected to the common pad portion for connection by soldering, the present invention is not limited in this respect, and other connection methods such as thermocompression bonding and welding may be used. It is.
[0030]
【The invention's effect】
In short, according to the present invention, the following excellent effects are exhibited.
[0031]
1) The production efficiency is good because the conductor can be easily and quickly connected without the need for wire-shaping work.
[0032]
2) An electrical failure such as a short circuit does not occur and a good connection can be made.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an electric wire according to an embodiment of the present invention.
FIG. 2 is a plan view showing the structure of an FPC according to an embodiment of the present invention.
FIG. 3 is an explanatory view showing a state in which the electric wires are arranged and fixed and the conductors at both ends are exposed in the embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a state in which the conductor of each electric wire is connected to the common pad portion for connection of the FPC in one embodiment of the present invention.
FIG. 5 is an explanatory diagram showing a cut and removed portion of a connection common pad portion in an embodiment of the present invention.
FIG. 6 is an explanatory view showing a state in which a connecting portion between each electric wire and a connecting terminal is formed by cutting and removing the connecting common pad portion in one embodiment of the present invention.
FIG. 7 is a plan view showing the structure of an FPC in a conventional wire terminal connection structure.
FIG. 8 is an explanatory diagram showing a state in which wires are arranged and fixed and conductors at both ends are exposed in a conventional wire terminal connection structure.
FIG. 9 is an explanatory view showing a state in which the conductor of the electric wire is trimmed in the conventional electric wire terminal connecting portion structure.
FIG. 10 is an explanatory view showing a conventional terminal connection structure of an electric wire.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric wire 3 Conductor 4 Insulator 10 Connection terminal 11 Connection common pad part 20 Connection part

Claims (4)

In the terminal connection part structure for connecting a plurality of electric wires to the connection terminals,
A common pad portion for connection that connects the end portions of the connection terminals together is formed on each connection terminal,
Arranging the plurality of electric wires corresponding to each connection terminal to be connected, removing the insulator at the end, exposing the conductor,
After connecting the conductors of the plurality of electric wires to the common pad portion for connection, the common pad portion for connection is removed by cutting and removing the portions located between the connection terminals and the electric wires. An electric wire terminal connecting portion structure characterized in that the connecting portion is electrically insulated. The terminal connection part structure of the electric wire according to claim 1, wherein the conductor of the electric wire is connected to the common pad part for connection by soldering, welding, or thermocompression bonding. The terminal connection part structure of the electric wire according to claim 1 or 2, wherein the common pad part for connection is cut and removed by irradiating a laser beam. In the terminal connection method for connecting a plurality of wires to the connection terminals,
A common pad portion for connection that connects the end portions of the connection terminals together is formed on each connection terminal,
Arranging the plurality of electric wires corresponding to each connection terminal to be connected, removing the insulator at the end, exposing the conductor,
After connecting the conductors of the plurality of electric wires to the common pad portion for connection, the common pad portion for connection is removed by cutting and removing the portions located between the connection terminals and the electric wires. A terminal connection method for an electric wire, characterized in that a connecting portion is electrically insulated.

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