JPH07245129A - Flat wire connection terminal and connection method for flat wire and terminal - Google Patents

Abstract

(57) [Summary] [Purpose] To securely connect terminals to fine-pitch flat wires. [Structure] Caulking portions 11 and 13 for the flat electric wire 4 are provided so as to face the substrate portion 3 of the terminal main body 2, and a protruding portion for abutting and welding to the tip portion of the exposed conductor 15a of the flat electric wire is provided on the substrate portion. 6 is provided. The caulking portion 1 on the board portion 3
The supporting protrusion 14 for the insulating coating 18 of the flat electric wire was formed so as to face No. 1. Then, the flat electric wire is inserted between the caulking portion 11 facing the substrate portion 3 of the terminal body 2 and the substrate portion, and the flat electric wire is inserted between the supporting projection 14 provided on the substrate portion and the caulking portion 11. While sandwiching the insulating coating portion 18,
The tip of the exposed conductor 15a of the flat electric wire is brought into contact with the protruding portion 6 that is erected on the substrate portion, and the protruding portion 6 is welded to the tip portion of the exposed conductor by beam irradiation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat wire connecting terminal which can securely connect and fix a fine pitch flat electric wire and a method for connecting the flat electric wire to the terminal.

[0002]

2. Description of the Related Art FIGS. 7 to 8 show a conventional method for connecting a flat electric wire and a terminal disclosed in Japanese Patent Laid-Open No. 2-30073. In this connection method, a holding piece 32 is formed by cutting and raising the end portion of the flat electric wire 29 having the plate conductor 28 in the insulating coating 27 on the side of the base portion 31 of the male terminal 30.
It is sandwiched and connected by. Fixing claws 33 and 34 are formed on the sandwiching piece 32, and the insulating coating 27 is sheared by the sandwiching piece 32 as shown in FIG. 8 (AA cross section of FIG. 7) and brought into contact with the plate conductor 28. The claws 33 and 34 are penetrated through the insulating coating 27, bent, fixed by crimping.

However, in the above-mentioned conventional connection method, it is difficult to connect or fix the flat electric wire 29 and the adjacent plate-shaped conductor 28 unless the holding piece 32 and the claws 33 and 34 of the terminal 30 are large to some extent. In the case of connecting a fine pitch flat electric wire having a narrow interval, there is a problem that it is difficult to secure the strength of the connecting portion and the reliability of the electrical connection.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a connection terminal for a flat electric wire and a flat electric wire and a terminal which can be surely connected and can be firmly fixed even when connecting a fine pitch flat electric wire. It is intended to provide a connection method of.

[0005]

In order to achieve the above object, the present invention provides a caulking portion for a flat wire facing a board portion of a terminal body, and exposing the flat wire on the board portion. It is based on a flat wire connecting terminal which is provided with a protrusion for abutting and welding on the tip of the conductor. Further, a flat wire connecting terminal formed by forming a supporting protrusion on the base plate portion so as to face the caulking portion and to cover the insulating coating of the flat wire is also effective.

Further, a flat electric wire is inserted between the caulking portion of the terminal body facing the substrate portion and the substrate portion, and the flat electric wire is inserted between the supporting protrusion provided on the substrate portion and the caulking portion. While sandwiching the insulation coating portion of the electric wire, the tip of the exposed conductor of the flat electric wire is brought into contact with the protruding portion that is erected on the substrate portion,
A method of connecting a flat electric wire and a terminal, characterized in that the projection is welded to the tip of the exposed conductor by beam irradiation, is also adopted.

[0007]

The flat electric wire is positioned by contacting the tip of the exposed conductor with the projecting portion of the terminal body, and is fixed by caulking with the board. That is, the support protrusion of the board portion presses against the insulating coating of the flat electric wire, and the exposed conductor is not directly pressed and fixed to the terminal body. The exposed conductor can be slightly moved in the longitudinal direction due to the bending of the insulating coating, whereby stress relaxation during welding is achieved. By irradiating the protruding portion with a beam such as a laser, the protruding portion and the tip of the exposed conductor are welded, and the fine-pitch flat electric wire is reliably connected.

[0008]

1 to 6 show an embodiment of a flat wire connecting terminal and a method of connecting a flat wire and a terminal according to the present invention. This flat wire connecting terminal 1 is shown in FIG.
As described above, the female terminal body 2 having a rectangular tubular shape is provided with the crimping and fixing portion 5 for the terminal portion 4a (see FIG. 3) of the flat electric wire 4 and the protruding piece 6 for positioning and beam welding on the substrate portion 3 side. Is.

That is, the crimping and fixing portion 5 raises the standing plate portion 9 along the one side plate portion 8 from the bottom plate portion 7 in the front half portion of the terminal main body 2 so as to extend above the substrate portion 3 and The tip end portion (11) of the plate portion 9 is bent so as to face the substrate portion 3 to form a caulking plate 11 in which an insertion space 10 for the terminal portion 4a of the flat electric wire 4 is formed between the plate portion 9 and the substrate portion 3. , The other side plate portion 12 of the base plate portion 3 is cut and raised to press the caulking piece 1
3 is formed, and the caulking plate 11 is formed behind the caulking piece 13.
A pair of supporting projections 14, 14 in the longitudinal direction of the terminal are formed to bulge on the substrate portion 3 so as to face the latter half portion 11a. The protruding piece 6 for positioning and beam welding is formed so as to rise from the center of the front end of the substrate portion 3 to a height about the thickness of the exposed conductor 15a of the terminal portion 4a of the flat electric wire 4.

The caulking plate 11 has a notch hole 16 for the caulking piece 13 and a notch piece 17 facing the upper end of the protruding piece 6. The rear half 11a of the caulking plate 11 projects and extends rearward from the standing plate 9, and has a notch groove 19 through which the insulating resin coating 18 of the flat electric wire 4 is inserted between the caulking plate 11 and the base plate 3 (see FIG. 2). . The pair of support ridges 14, 14 slightly protrude toward the caulking plate 11 in the insertion space 10 with respect to the terminal portion 4a, and the curved surface 14a at the upper end of the supporting ridges 14 and 14 from the insulating coating 18 of the flat electric wire 4 onto the plate-shaped conductor. Press 15. An elastic contact piece 20 is integrally formed on the bottom plate portion 7 of the terminal body 2.

The terminal portion 4a of the flat electric wire 4 is inserted into the insertion space 10 from the rear of the terminal body 2 as shown in FIGS.
The exposed conductor 15a protruding forward from the insulating coating 18 is brought into contact with the protruding portion 6 of the terminal body 2 for positioning.
In this state, the caulking plate 11 and the caulking piece 13 are bent horizontally as shown in FIG. 4, and the terminal portion 4a is pressure-bonded and fixed to the substrate portion 3.

As shown in FIG. 5, the pair of support ridges 14, 14 dig into the insulating resin coating 18 of the flat electric wire 4 (press it without piercing) and press the plate-shaped conductor 15 into the caulking plate 1.
The flat electric wire 4 is fixed by pressing toward 1. Figure 5
As described above, the exposed conductor 15a of the flat electric wire 4 is positioned with a slight gap 21 between the flat wire 4 and the board portion 3 and between the caulking plate 11 and indirectly by pressing the insulating coating 18 by the supporting ridges 14. , And is slightly movable in the longitudinal direction of the electric wire due to the bending of the insulating coating 18 during beam welding.

As shown in FIGS. 4 and 5, a high energy density beam 22 such as a laser is irradiated horizontally from the front of the terminal body 2 toward the projecting piece 6, and as shown in FIG. 6, the projecting piece 6 and the exposed conductor of the flat wire 4 are exposed. 15a and the notch piece 17 of the caulking plate 11 are welded to each other. At this time, the exposed conductor 15a is the supporting ridge 1
4 can be bent in the longitudinal direction with the fulcrum as a fulcrum, whereby the residual stress of the welded portion 23 is relieved.

Further, by irradiating the projecting piece 6 with the laser beam 22, the tip portion of the thin and narrow exposed conductor 15a of the flat electric wire 4 can be reliably welded. That is, when the laser beam is irradiated from above toward the exposed conductor 15a as shown by the arrow 24 in FIG. 5, the caulking plate 11 of the terminal 1 is constricted and deformed, and tensile stress is applied to this welded portion. At that time, the terminal 1 side may be broken. Laser irradiation of the protruding piece 6 prevents deformation of the terminal 1 and is suitable for a portion having a small welding area such as a fine pitch flat electric wire 4.

In FIG. 4, the terminals 1 are welded to the adjacent exposed conductors 15a of the flat electric wire 4, respectively. Further, since the terminal 1 is for connecting the flat electric wire 4 to the upper portion (on the substrate portion 3) by welding instead of crimping the round electric wire to the rear portion, the size of the electric wire crimping portion is larger than that of the conventional crimping terminal. The length is shortened and the size is reduced. Further, instead of the laser beam 22, simultaneous multi-point welding using an optical fiber is also possible.

[0016]

As described above, according to the present invention, the tip of the exposed conductor of the flat electric wire is positioned by the projection of the terminal body, and the tip and the projection are connected by beam welding. A fine pitch flat electric wire having a narrow conductor interval and a narrow conductor width can be reliably connected to a terminal with high positional accuracy and without breakage. In addition, since the supporting projection of the terminal body clamps the insulation coating of the flat wire between the crimping section and the exposed conductor is not fixed, it can be moved within the deflection range of the insulation coating, so the stress at the conductor weld is reduced. As a result, the static strength of the welded portion and the fatigue strength against vibration and the like are improved, and the reliability of electrical connection is increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a flat wire connecting terminal according to the present invention.

FIG. 2 is a side view showing a state in which a flat electric wire is attached to a terminal.

FIG. 3 is a perspective view showing a state in which a flat electric wire is also fixed.

FIG. 4 is a perspective view showing a state in which a flat electric wire is fixed.

FIG. 5 is a side view having a partial cross section in a state where the flat electric wire is also fixed.

FIG. 6 is a cross-sectional view of an essential part of a state in which a flat electric wire and a terminal are beam-welded.

FIG. 7 is an exploded perspective view showing a conventional example.

FIG. 8 is a cross-sectional view taken along line AA of FIG. 7, also showing the connection state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat wire connection terminal 2 Terminal body 3 Board part 4 Flat wire 6 Projecting piece 11 Caulking plate 13 Caulking piece 14 Supporting projection 15a Exposed conductor 18 Insulation coating 22 Laser beam

[Procedure amendment]

[Submission date] June 16, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

In FIG. 4, the terminals 1 are welded to the adjacent exposed conductors 15a of the flat electric wire 4, respectively. Further, since the terminal 1 is for connecting the flat electric wire 4 to the upper portion (on the substrate portion 3) by welding instead of crimping the round electric wire to the rear portion, the size of the electric wire crimping portion is larger than that of the conventional crimping terminal. The length is shortened and the size is reduced. It also splits the laser beam and transmits it through an optical fiber.
Simultaneous multi-point welding is also possible by sending .

Claims (3)

[Claims] 1. A crimping portion for a flat electric wire is provided facing a board portion of a terminal body, and a projection portion for abutting and welding to a tip portion of an exposed conductor of the flat electric wire is provided on the board portion. Flat wire connection terminal consisting of. 2. The flat wire connecting terminal according to claim 1, wherein a supporting protrusion for the insulating coating of the flat electric wire is formed on the substrate portion so as to face the caulking portion. 3. A flat electric wire is inserted between a caulking portion of the terminal body facing the substrate portion and the substrate portion, and the flat wire is inserted between the supporting protrusion provided on the substrate portion and the caulking portion. While sandwiching the insulating coating portion of the electric wire, the tip of the exposed conductor of the flat electric wire is brought into contact with the protruding portion that is erected on the substrate portion, and the protruding portion is welded to the end portion of the exposed conductor by beam irradiation. A method of connecting flat wires and terminals characterized by.