JP3430634B2 - How to connect tape wires - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily and reliably connecting a tape conductor to each other or a metal conductor such as a terminal attached to the tape conductor and its end. The tape electric wire mentioned here is a flat cable having a rectangular conductor or a flexible substrate (FP) which is a similar wiring material.
C) is also included.

[0002]

2. Description of the Related Art When connecting a tape electric wire to a circuit board,
Usually, attach a resin reinforcing plate to the end of the wire with the conductor exposed,
Although a method of inserting this portion into a connector on the board is adopted, this method of utilizing a flexible tape electric wire as a terminal lacks insertion / removal durability. For this reason, there are an increasing number of cases in which a rigid terminal is attached to the end of the wire and the terminal is detached or inserted.

The terminal is attached to the tape electric wire by crimping, as disclosed in Japanese Patent Laid-Open No. 63-13285, by means of the actual flat wire 1-.
It is performed by ultrasonic welding or the like disclosed in Japanese Patent No. 139984 and Japanese Patent No. 1-139985.

[0004]

Problems to be Solved by the Invention JP-A-63-1328
The crimp-type connecting strip disclosed in Japanese Patent Publication No. 5 is difficult to cope with the narrowing of the connection pitch because its downsizing is structurally limited.

Further, since the electric conductor is obtained by piercing the electric wire conductor with a sharp tooth, the conductor is damaged, the strength of the electric wire is reduced, the conduction area is small, and the connection reliability is low.

Ultrasonic welding is effective in solving these problems. However, in the conventional ultrasonic welding, the coating of the end of the electric wire is removed and the conductor that is stripped off is connected to the conductor of the terminal or the mating electric wire, so that the tensile strength of the connection portion is reduced. In addition, since peeling is required, it takes time and labor for the work, and since the joint portion of the conductor is exposed to the atmosphere, oxidation and corrosion of this portion are likely to proceed, and the electrical characteristics become unstable.

[0007] Therefore, an object of the present invention is to provide a method for connecting a tape electric wire which can be connected easily and reliably, and which is not subject to any restriction even in a narrow pitch connection.

[0008]

In order to solve the above-mentioned problems, in the present invention, a tape electric wire or a tape electric wire and a metal conductor are superposed and sandwiched between an ultrasonically vibrating tip and an anvil, and the tip and the anvil. By applying ultrasonic vibration under pressure, the coating of the tape electric wire existing between the connection target conductors is removed to bring the connection target conductors into contact with each other.

If necessary, thereafter, a method of ultrasonically welding the contacted conductors by further applying pressure and applying ultrasonic vibrations is adopted.

The anvil used in this connection method is preferably one in which the position of the pressing surface is higher than the total thickness of the coating between the conductors to be connected.

[0011]

In the present invention, a part (covered portion) of the coating of the tape electric wire is broken or melted by ultrasonic vibration and removed, and when the removal is completed, the conductor of the connection partner comes into contact with the electrical connection. Since the conductors are electrically connected to each other, the stripping of the coating and the conductor connection are completed in one operation, and the laborious pre-stripping step is omitted, and the work is simple and easy.

Further, since the coating is partially removed to reinforce the coating and seal the conductor, the tensile strength of the connecting portion is improved, and the oxidation resistance and corrosion resistance of the joint portion are also improved. The durability is also improved.

Further, the fusion of the coating due to ultrasonic vibration occurs, so that the bonding strength is also increased.

When the conductor is ultrasonically welded after removing the coating, the connection becomes more stable. Not only the tensile strength and the bonding strength increase, but also the contact resistance increase due to the surface oxidation of the conductor does not occur.

If the pressure surface (support surface) of the anvil is set higher than the total thickness of the wire coating existing between the conductors to be connected, the deformation of the conductor due to pressure and the resulting reduction in strength are suppressed, and the tensile strength is reduced. Strength and connection stability are further improved.

[0016]

FIG. 1 shows an example of the connection method of the present invention. This figure shows a case in which the tape electric wires 1 and 1 are overlapped and connected. In the figure, 4 is the tip of the ultrasonic welding machine and 5 is the anvil.

The ultrasonic welding machine vibrates a vibrator with an oscillator and transmits the vibration to a tip via a cone and a horn, and applies ultrasonic vibration to a welding object sandwiched between the tip and the anvil. Weld the object with friction heat.

When the ultrasonic vibrating tip 4 and the anvil 5 are brought close to each other by using the welding machine and pressure is applied, the coating 2 on the pressed portion of the electric wire is broken and removed, as shown in FIG. 1 (b). , The upper and lower electric conductors 3 and 3 come into contact with each other to be electrically conducted. In this state, the tape wires 1 and 1 are made of polyethylene (PE), polyimide (PI), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyphenyl sulfone (PPS). ) And the like, the coatings 2 are fused and fixed to each other. Further, the contact surfaces of the conductors 3 are sealed in the coating 2 to prevent oxidation and corrosion, and suppress an increase in contact resistance due to surface oxidation. Therefore, in this case, it is not essential to join the conductors 3 and 3 that are in contact with each other, but after this, it is more desirable to ultrasonically weld the conductors 3 and 3 by continuing the application of pressure and ultrasonic vibration. You can

It should be noted that when the anvil 5 having a flat pressing surface 5a as shown in FIG.
As shown in (c), the conductor 3 on the upper side is largely deformed, and the conductor strength of the pressed portion is likely to be impaired. Therefore, in order to eliminate the problem, as shown in FIG. 2, the position of the pressure surface 5a of the anvil 5 is set so that the height H of the surface is the conductor 3 to be connected,
It is desirable to increase the thickness up to a point where it is larger than the total thickness h of the coating 2 existing between the three. By doing so, the position of the tape electric wire is lowered with the removal of the coating 2, so that the deformation of the conductor 3 is reduced as shown in FIG. 2 (c).

A tape electric wire having a conductor having a width of 2 mm was connected by the method shown in FIGS. 1 and 2 and its tensile strength was examined. The connection was made by simply bringing the conductors 3 and 3 into contact with each other without performing harmonic welding. For comparison, the tensile strength of the connection portion where the copper conductor was stripped and directly connected was also examined.

Further, each sample was tested at a temperature of 80 ° C. and a humidity of 85%.
It was kept in the constant temperature and humidity chamber for 1000 hours, and the resistance increase during this period was also examined. The results are shown in Table 1.

[0022]

[Table 1]

From these results, it can be seen that the method of the present invention is effective in improving the tensile strength and improving the electrical characteristics.

FIG. 3 shows a case in which the metal terminal 6 is connected to the end portion of the tape electric wire 1.

The metal terminals 6 are connected to the carrier leads 7 and the required number of the metal terminals 6 are collectively supplied, and the metal terminals 6 are stacked on the coating of the conductor existing portion of the tape electric wire 1. Then, this is sandwiched between the tip 4 and the anvil 5, and the coating 2 is performed by applying pressure and ultrasonic vibration.
Is removed and brought into contact with the conductor 3 of the electric wire. Although electrical conduction can be obtained in this state, it is not preferable to rely on only the force of the coating 2 to fix the terminal 6 which is repeatedly inserted and removed, and in this case, the terminal 6 is ultrasonically welded to the conductor 3.

When this welding is completed, the carrier lead 7
Disconnect. With this method, the connection pitch, which was the lower limit of about 1 mm when using the crimp type terminal, can be easily reduced to about 0.5 mm. In addition, the durability of insertion and removal when the tape wire itself was made into a connector using the reinforcing plate was limited to 50 times, but the ultrasonic welding of the terminal by the method of Fig. 3 withstands insertion and removal 100 times or more. It was

[0027]

As described above, in the connection method of the present invention, the coating of the tape electric wire is removed by ultrasonic vibration to perform the stripping of the coating and the conductor connection in one movement, so that the work is simplified and simplified. become.

Further, since the electric wire is reinforced and fixed by the remaining coating and the conductor is sealed and protected, the tensile strength of the connecting portion and the reliability of the electrical characteristics are improved, and the connecting portion is excellent in durability. Is obtained. In particular, the method of ultrasonically welding the conductor can form a connector having higher connection reliability and excellent insertion / extraction durability at the tape electric wire end.

[Brief description of drawings]

1A and 1B are process diagrams showing an example of a connection method of the present invention, and FIG. 1C is a sectional view taken along line XX of FIG. 1B.

2A and 2B are process diagrams of another embodiment. (C): A sectional view taken along the line XX in (b).

FIG. 3A is a plan view showing a connection example of metal terminals. (B), (c): Connection process drawing (D): Plan view after connection is completed

[Explanation of symbols]

1 tape electric wire 2 coating 3 conductors 4 chips 5 Anvil 5a Pressure surface 6 metal terminals 7 career lead

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-121139 (JP, A) JP-A-52-42287 (JP, A) JP-A-52-104786 (JP, A) JP-A-52- 104787 (JP, A) JP 52-545080 (JP, A) JP 5-205841 (JP, A) JP 43-22388 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01R 43/02 H01R 9/07

Claims (2)

(57) [Claims] 1. A rectangular conductor covered with an insulating material is laminated between tape electric wires and sandwiched between a tip and an anvil that vibrate ultrasonically, and the tip and anvil exist between the conductors to be connected by applying ultrasonic vibration under pressure. The coating of the tape wire is removed to bring the conductors to be connected into contact with each other, and the coatings of the tape wires are fused to encapsulate the contact surface of the conductor to be connected in the coating, after which pressure and ultrasonic vibration are further applied. The method of connecting the tape electric wire by ultrasonically welding the conductors which are continuously contacted with each other. 2. The method of connecting a tape electric wire according to claim 1, wherein a series of operations are carried out by using an anvil in which the pressing surface is flat and the position of the pressing surface is higher than the total coating thickness between the conductors to be connected.