JP2001230009A - Crimp terminal for flat cable and its connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crimp terminal for a flat cable which has an increased initial connection strength and further a continued connection strength, and its connection method. SOLUTION: With a top plate fitted to a conductive body exposed in a face of the flat cable and a bottom plate fitted to a plastic film of the flat cable of another side, and a part having a claw incidental to the top plate piercing through the plastic film of the flat cable and calked to the bottom plate, a hole for ultrasonic bonding (welding) or resistance welding is provided on either the top plate or the bottom plate, and then, bonding of a crimp terminal to the flat cable is made by ultrasonic bonding (welding) or resistance welding in addition to crimping, thus enhancing the initial bonding strength and enabling maintenance of the bonding strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimp terminal for a flat cable which is used as a fixed wiring or a movable part wiring in an electric / electronic device, and a connection method thereof. The flat cable here has a structure in which a flat conductor having a flat rectangular cross section is sandwiched (laminated) between plastic films with an adhesive as an insulating material, and has a thickness of 0.1 to 0.1 mm.
It is a thin flat wire of 3 mm.

[0002]

2. Description of the Related Art Flat cables of this type are classified into a rigid type and a flexible type having high flexibility. These are used properly depending on the application, such as jumper wires (fixed wiring) between electric / electronic device circuits and wiring of movable portions thereof. The connection of this flat cable to a device has been implemented by soldering or insertion into a connector.

[0003] The flat cable has been used as an internal wiring of an automobile, for example, an airbag wiring. However, the connection is different from the soldering or connector insertion connection as described above, and a crimp terminal may be used in some cases. This crimp terminal is formed by punching a metal plate of a conductive material such as a copper alloy or an aluminum alloy into a shape as shown in FIG.
Then, the claws 4 and the crimping portion lower plate 3 are formed, and the crimping terminal base material 1 is formed as shown in FIG. 10, that is, the conductor gripping portion 6 is bent and formed into a substantially U-shape. Board 2
And the lower plate 3 are bent and formed so as to overlap vertically.

FIGS. 11 and 12 show a state in which the crimp terminal formed as described above is attached to a flat cable. The conductor 10 is inserted into the conductor grip 6 and crimped. The upper and lower plates 2 and 3 of the terminal
The end of the flat cable 7; after peeling off the plastic film 9 on one side and inserting it into the exposed end of only one side of the conductor 8 as shown in FIG. 11, with the surface of the upper plate 2 applied to one side of the conductor 8, As shown in FIGS. 12A and 12B, the claws 4 and 4 attached to both sides of the upper plate 2 are pierced through the plastic film 9 on one side and swaged to the lower plate 3 like staples (staples). 2 and the conductor 8 are crimped and electrically and mechanically connected.

[0005]

The prior art described above; FIGS.
According to the flat cable crimp terminal shown in FIG. 12 and the method of connecting the crimp terminal, the conductor and the crimp terminal are caulked and joined in the manner of staples. Due to this problem, the crimp terminal may rarely come off the flat cable. In addition, when placed in a high-humidity environment (for example, inside an automobile), moisture (humidity) may enter between the joints of the crimp terminal and the flat cable conductor, causing the crimp terminal and the flat cable conductor to corrode. . If the corrosion progresses with the passage of time and the contact resistance between the crimp terminal and the flat cable conductor continues to increase, in the worst case, the terminal portion cannot be electrically connected.

Accordingly, an object of the present invention is to provide a flat cable crimp terminal and a method of connecting the crimp terminal which can increase the initial bonding strength of the crimp terminal to the flat cable and maintain the bonding strength for a long time. It is in.

[0007]

According to the present invention, there is provided a flat cable crimping terminal provided with a crimping portion for crimping an end of a flat cable; an upper plate which is applied to a conductor exposed on one side of the flat cable, and a flat cable. In a portion having a lower plate applied to one side of the plastic film and a claw attached to the upper plate and having a claw that is pierced through the plastic film of the flat cable and caulked to the lower plate, the upper plate or the lower plate has Ultrasonic welding (welding)
A hole for welding or resistance welding is provided, so that the bonding of the crimp terminal to the flat cable increases the initial bonding strength by performing ultrasonic bonding (welding) or resistance welding in addition to crimping, and this bonding strength Is made possible.

The method for connecting a crimp terminal to a flat cable provided by the present invention is characterized in that the crimp terminal is used to perform crimping between the original upper plate of the crimp terminal and the conductor of the flat cable, The conductor of the flat cable and the upper plate or the lower plate are ultrasonically bonded (welded) or resistance-welded through a hole provided in the plate or the lower plate.

[0009]

1 and 2 show a first embodiment of a flat cable crimp terminal according to the present invention.

As shown in FIG. 1, the crimp terminal of the first embodiment is formed by stamping out a metal plate of a conductive material such as a copper alloy or an aluminum alloy with a press, and has a rectangular conductive wire. Gripping part 6 and crimping part upper plate 2 and claw 4,
4 and the crimping portion lower plate 3 are formed.
Open. The crimp terminal base material 1 shaped as described above
2 is formed as shown in FIG. 2, the wire gripping portion 6 is bent substantially in a U-shape, and the upper plate 2 and the lower plate 3 are bent so as to be vertically overlapped with each other at the crimping portion. The crimp terminal 12 is obtained by being bent obliquely upward.

[0011] The crimp terminal 1 thus bent and formed.
FIGS. 3 and 4 show a first embodiment in which terminals are attached to a flat cable using No. 2. FIG. As is clear from FIG.
A conductor 10 such as a copper stranded wire is inserted into the conductor gripping portion 6 and crimped to make a terminal with a conductor, while the upper plate 2 and the lower plate 3 of the crimping portion are connected to a flat cable 7.
End of one side; peel plastic film 9 on one side and remove conductor 8
Is inserted into the exposed end of only one side of FIG.
As shown in (b), with the surface of the upper plate 2 applied to one surface of the conductor 8, the claws 4, 4 attached to both sides of the upper plate 8 pierce the plastic film 9 on one surface, and By crimping the protruding end side to the surface of the lower plate 3 in the manner of staples (staples), the upper plate 2 and the conductor 8 are crimped.
As shown in (b), an ultrasonic wave is applied between the plastic film 9 exposed through the hole 31 of the lower plate 3 and the upper plate 2, and the conductor 8 and the upper plate 2 are ultrasonically bonded (welded). .

[0012] Connection to the flat cable by the above method; connection of the crimped terminal joined; as a result of confirming the joint strength, the initial connection compared to the conventional crimped terminal (FIGS. 9 to 12);
It was verified that the bonding strength was increased and that the strength was maintained for a long time. At the time of terminal attachment, the plastic film was slightly torn at the hole of the lower plate, but did not affect various characteristics.

FIG. 5 shows a second embodiment of the flat cable crimp terminal and the connection method according to the present invention.
FIG. 6 shows the crimp terminal connected to a flat cable; a second embodiment is shown. In the first embodiment described above, the same parts as those in FIGS.
, The same reference numerals as those of FIG. 1 are used, so also refer to the description of the first embodiment described above; FIGS.

In the second embodiment, the crimping terminal has a hole 21 formed in the upper plate 2 of the crimping portion, as shown by reference numeral 13 in FIG.

The wire 1 is attached to the wire holding portion 6 of the crimp terminal 13.
0 to form a crimp terminal with a conducting wire, the upper plate 2 and the lower plate 3 of the crimped portion are covered with the end of the flat cable 7; As shown in FIGS. 6 (a) and 6 (b), with the surface of the upper plate 2 applied to one surface of the conductor 8, the claws 4, 4 attached to both sides of the upper plate 8 are put on one side of a plastic film. 9 is pierced and the protruding end sides of the claws 4 and 4 are crimped on the surface of the lower plate 3 in the manner of staples (staples), whereby the upper plate 2 and the conductor 8 are crimped, and further shown in FIG. As described above, ultrasonic waves are applied between the conductor 8 exposed through the hole 21 of the upper plate 2 and the lower plate 3, and the conductor 8 and the lower plate 3 are ultrasonically bonded (welded).

As a result of confirming the connection to the flat cable by the above-described method; the connection of the crimped terminal joined; and the joint strength, the second embodiment also has the same initial crimp terminal as in the first embodiment described above. It was possible to improve the connection strength and maintain the connection strength for a long time.

FIG. 7 shows a third embodiment of the flat cable crimp terminal and the connection method according to the present invention.
FIG. 8 shows the crimp terminal connected to a flat cable; a third embodiment is shown. In the first embodiment described above, the same parts as those in FIGS.
, The same reference numerals as those of FIG. 1 are used, so also refer to the description of the first embodiment described above; FIGS.

In the third embodiment, the same crimp terminal 12 as in the first embodiment is used, and the conductor 10 is gripped by the conductor gripper 6 to form a crimp terminal with a conductor. 3 is inserted into the end of the flat cable 7; the end where only one surface of the conductor 8 from which the plastic film 9 on one surface is peeled is exposed, and the upper plate 2 is inserted as shown in FIGS.
With the surfaces of the claws 4 and 4 attached to one side of the conductor 8, the claws 4 and 4 attached to both sides of the upper plate 8 are pierced through the plastic film 9 on one side, and the protruding ends of the claws 4 and 4 are stapled to the surface of the lower plate 3. By crimping in the manner of (stapling), the upper plate 2 and the conductor 8 are press-bonded, and the portion of the plastic film 9 exposed through the hole 31 of the lower plate 3 is peeled off.
After the lower surface is exposed, the conductor 8 and the upper plate 2 are subjected to resistance welding. Note that the partial peeling of the plastic film 9 is preferably performed in advance.

As a result of confirming the connection to the flat cable by this method; the connection of the bonded crimp terminal; and the bonding strength, in the third embodiment, as in the first embodiment described above,
It was possible to improve the initial connection strength of the crimp terminal and maintain the connection strength for a long time.

[0020]

As described above, according to the present invention, the initial bonding strength of the crimp terminal to the flat cable is increased,
Further, an intended problem of providing a crimp terminal for a flat cable and a method of connecting the crimp terminal, which can maintain the bonding strength for a long time; Problem: Terminals are rarely detached due to low initial bonding strength, and it is possible to improve the point that the contact area is corroded and the contact resistance increases with time in a high-humidity environment, greatly contributing to the reliability of the terminal crimping part. You can do it.

[Brief description of the drawings]

FIG. 1 is a front view showing a crimp terminal for a flat cable according to a first embodiment of the present invention using a crimp terminal base material.

2 shows a crimp terminal finished product obtained by bending and forming the crimp terminal base material of FIG. 1, (a) is a front view, (b) is a right side view,
(C) is a bottom view, and (2) is an explanatory cross-sectional view taken along the line AA of (A).

FIG. 3 is an explanatory front view showing a first embodiment of a method of attaching a terminal to a flat cable using the crimp terminal of FIG. 1 in a state of insertion of the crimp terminal;

FIG. 4 shows the first embodiment of the present invention in a state in which a crimp terminal is connected to a flat cable.
FIG. 2 is an explanatory cross-sectional view taken along line AA of FIG.

FIG. 5 is an explanatory front view showing a crimp terminal according to a second embodiment of the present invention and a method for connecting the crimp terminal in an insertion state of the crimp terminal.

FIG. 6 shows a second embodiment of the present invention in a state in which a crimp terminal is connected to a flat cable, (a) is a front view, and (b)
FIG. 2 is an explanatory cross-sectional view taken along line AA of FIG.

FIG. 7 is an explanatory front view showing a third embodiment of the crimp terminal and the method for connecting the crimp terminal according to the present invention in a state where the crimp terminal is inserted.

FIG. 8 shows the third embodiment of the present invention in a state in which a crimp terminal is connected to a flat cable.
FIG. 2 is an explanatory cross-sectional view taken along line AA of FIG.

FIG. 9 is a front view showing an example of a conventional crimp terminal for a flat cable using a crimp terminal base material.

10 shows a crimp terminal finished product obtained by bending and forming the crimp terminal base material of FIG. 9, (a) is a front view, (b) is a right side view, (c) is a bottom view, and (n) is the same as above ( FIG.

11 is an explanatory front view showing an example of a method of attaching a terminal to a flat cable using the crimp terminal of FIG. 10 in a state of insertion of the crimp terminal;

FIG. 12 shows an example of terminal attachment of the above, in a state in which a crimp terminal is connected to a flat cable, (a) is a front explanatory view,
(B) is an explanatory sectional view taken along the line AA in (a).

[Explanation of symbols]

 2 Upper plate of crimping part 3 Lower plate of crimping part 4 Claw 6 Conductor gripping part 7 Flat cable 8 Conductor 9 Plastic film 10 Conductor 11 Crimp terminal base material 12 Crimp terminal 13 Crimp terminal

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E051 LA02 LA04 LA06 LB03 5E077 BB02 BB05 BB11 DD03 DD08 HH07 JJ10 5E085 BB02 BB05 BB12 CC03 DD03 DD04 DD13 EE06 FF01 HH06 HH11 HH13 HH27 JJ06 JJ36

Claims (2)

[Claims] 1. A flat wire having a conductor gripping portion and a crimping portion for crimping to an end of a flat cable, wherein the crimping portion is applied to a conductor exposed on one side of the flat cable and the other side of the flat cable is provided. A lower plate applied to the plastic film, and a claw attached to the upper plate and piercing through the plastic film of the flat cable and caulking the lower plate, and further, the upper plate or the lower plate has an ultrasonic wave. A crimp terminal for a flat cable, wherein a hole for joining (welding) or resistance welding is provided. 2. An end of a flat cable is sandwiched between an upper plate and a lower plate by using a crimp terminal holding a conductive wire, and a nail on the upper plate is pierced through a plastic film of the flat cable and swaged to the lower plate. The upper plate and the conductor of the flat cable are crimped, and a hole is formed in the upper plate or the lower plate, and the conductor of the flat cable and the upper plate or the lower plate are ultrasonically bonded (welded) through the hole. A method for connecting flat cable crimp terminals, which is characterized by resistance welding.