JPH1129002A - Membrane switch for airbag system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a membrane switch for airbag systems, which has better quality in which caulked holes made of copper foil at its switch part never deform. SOLUTION: A membrane switch comprises a first contact part having a first conductive membrane 12, a second contact part having a second conductive membrane 16 on the back of the first conductive membrane 12, and a dot for normally separating these first and second membranes from each other. The switch has a leg part 2 extended from its switch part 1, on which leg part the membrane switch-side terminal 31 of a first lead wire 3 is connected to the first membrane 12 by means of a hollow rivet 5 in a window 17a made in a support carrier where the first membrane 12 is exposed, and the membrane switch-side terminal 41 of a second lead wire 4 is connected to the second membrane 16 by means of a hollow rivet 6 in a window 13a made in the carrier where the second film 16 is exposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane switch for an airbag device.

[0002]

2. Description of the Related Art The applicant of the present invention has proposed a membrane switch that is locked to an inner body having a novel configuration as a membrane switch employed in an airbag device (see Japanese Patent Application No. 9-73534). In this airbag device, the inner body is placed on the folded airbag, and
An airbag device comprising a membrane switch disposed on the inner body and an elastically deformable cover body covering the inner body and the membrane switch, wherein the cover body is made of a soft synthetic resin. A plurality of protrusions are provided on the back surface, and a plurality of convex ribs or a plurality of substantially cylindrical bosses are formed on the peripheral edge on the front side of the inner body, and a cushion is attached to the front side of the membrane switch. Have been. Further, the inner body has an engagement groove formed to be slidably engaged with an engagement claw formed on the cover body.

[0003] The membrane switch comprises a switch portion having a substantially rectangular shape mounted on an upper plate portion of an inner body;
And a leg portion extending from the switch portion.
A lead wire extends from a leg portion of the membrane switch, and the lead wire is electrically connected to a horn device provided on the vehicle body side. In the membrane switch, a locking hole formed in a leg portion thereof is locked to a locking projection of the inner body, and a switch portion is fixed to an upper plate portion of the inner body. A cushion is adhered to the front side of the switch section with an adhesive or a double-sided tape.

Conventionally, the lead wire has been fixed to the membrane switch by crimping a caulking portion provided at the terminal of the lead wire after penetrating the switch portion of the membrane switch.

[0005] However, the switch section is composed of conductive parts vertically opposed to each other via a spacer, a support carrier for supporting these conductive parts, and the like. The conductive part is formed of copper foil. By simply swaging the swaged portion provided at the lead wire terminal, the swaged portion has low tensile strength,
The caulking hole of the copper foil may be deformed.

[0006]

SUMMARY OF THE INVENTION The present invention provides a high-quality membrane switch in which a caulking hole of a copper foil in a switch portion is not deformed in a membrane switch employed in an airbag device as described above. That is the task.

[0007]

A first contact portion having a first conductive film and a second contact portion facing the back surface of the first conductive film are provided.
And a dot for separating the first and second conductive films from each other in a normal state, wherein the second and third conductive films are separated from each other at normal times. In the leg part, the first lead
The terminal of the lead wire on the membrane switch side is connected to the first conductive film by a hollow rivet at the window of the support where the first conductive film is exposed, and the terminal of the second lead wire on the membrane switch side is connected to the first conductive film. The second conductive film is connected to the second conductive film by a hollow rivet at a window portion of the support where the second conductive film is exposed.

[0008]

Embodiments of the present invention will be described with reference to the drawings. The membrane switch has a film shape (film shape) that can be elastically deformed, and as shown in FIG.
And a leg piece portion 2 extending to the front end. And
As shown in FIG. 2, the switch unit 1 includes a first contact unit 11.
And a second contact portion 15 opposed to the lower side of the first contact portion 11, and a plurality of the second contact portions 15 at predetermined intervals between the first contact portion 11 and the second contact portion 15. Dot 1
9 are arranged. Further, the first contact portion 11 is provided with a first contact portion.
And the first support 1 bonded to the first conductive film 12 with an adhesive 14 and supporting the first conductive film 12 from above.
3 and the second contact portion 15 is formed by a second conductive film 16 and a second support carrier 17 bonded to the second conductive film 16 with an adhesive 18 and supporting the second conductive film 16 from below. Normally, the first conductive film 12 and the second conductive film 16 are held with a predetermined distance therebetween via the dots 19.

Then, the first and second conductive films 12, 1
6 is formed of, for example, a copper foil, and each of the support carriers 13, 1
7 is formed of, for example, a polyester film (PET film). The dots 19 are formed of, for example, an elastically deformable silicone rubber.

Also, a switch unit 1 of a membrane switch
A lock hole 1a and a lock protrusion 1b are formed in the outer peripheral portion of the lock member. Is inserted, the membrane switch 1 is fixed to the inner body.

On the other hand, locking holes 21 are formed in the leg 2 of the membrane switch.
Is locked to the locking projection of the inner body.

Further, at the base of the leg 2, the first lead wire 3 is connected to the first conductive film 12 by the hollow rivet 5.
The second lead wire 4 is connected to a second conductive film 16 by a hollow rivet 6.

As shown in FIG. 1, one end of the first lead wire 3 is connected to a membrane switch side terminal 31, and the other end is connected to a horn device side terminal 32. . Similarly, the second lead wire has one end connected to the membrane switch side terminal 41 and the other end connected to the horn device side terminal 42.

As shown in FIG. 3, the membrane switch side terminal 31 is disposed in the window 17a of the support 17 where the first conductive film 12 is exposed, and the hollow rivet 5 is inserted into the rivet hole 20 (FIG. 6). (See FIG. 2), a caulking portion 5 a is formed on the window portion 17 a side, and is electrically connected to the first conductive film 12. Also, the membrane switch side terminal 32
Is arranged in the window 13a of the support 13 where the second conductive film 16 is exposed, as shown in FIG. 4, and the hollow rivet 6 is passed through the rivet hole 20 '(see FIG. 6).
A caulking portion 6a is formed on the window 13a side, and the second conductive film 1 is formed.
6 are electrically connected.

The first lead connected to the first conductive film 12
The wire 3 is inserted into the crimping hole 22 formed in the leg 2 (FIG. 5).
・ See FIG. 6), the swaged portion 31a of the membrane switch side terminal 31 is swaged and fixed, and the first lead wire 3 is passed through the through hole 25 and drawn out to the front side (the first contact portion 11 side). It is. The second lead wire 4 connected to the second conductive film 16 is connected to the crimping hole 23 (see FIGS. 5 and 6) formed in the leg portion 2 by the membrane switch side terminal 41 thereof.
Is caulked and fixed.

FIG. 7 shows another embodiment of the leg piece.
A small diameter hole 26 is formed instead of the through hole 25, and a slit 27 is formed to communicate with the small diameter hole 26. In the case of the leg portion 2 ′, the first lead wire 3 connected to the first conductive film 12 is formed by a caulking hole 22 formed in the leg portion 2.
(See FIG. 7), the caulked portion 31a of the membrane switch side terminal 31 is fixed by caulking, the leg piece 2 'is divided into two by the slit 27, and the small diameter hole is passed through the first lead wire 3 from there between. 26 through the front side (the first contact portion 11 side)
Drawn to. In addition, the diameter of the small diameter hole 26 is 2.5 mm or more.
It is about 3.0 mm. Further, the second lead wire 4 connected to the second conductive film 16 is inserted into the crimping hole 23 (see FIG. 7) formed in the leg portion 2 ′ by the crimping portion of the membrane switch side terminal 41. 41a is fixed by caulking.

[0017]

According to the present invention, according to the hollow rivet,
Since the membrane switch side terminal of the lead wire is connected to the conductive film, the two can be reliably connected without deforming the conductive film.

[Brief description of the drawings]

FIG. 1 is a plan view of a membrane switch for an airbag device of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 1;

FIG. 5 is a plan view of a membrane switch for an airbag device before a lead wire is connected.

FIG. 6 is an enlarged view of a main part of FIG. 5;

FIG. 7 is a partially omitted plan view showing another embodiment of a membrane switch for an airbag device before a lead wire is connected.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Switch part 2 Leg piece part 3 1st lead wire 4 2nd lead wire 5 Hollow rivet 6 Hollow rivet 11 1st contact part 12 1st conductive film 13 Support carrier 14 Adhesive 15 2nd Contact point 16 Second conductive film 17 Support carrier 18 Adhesive 19 Dot 20, 20 'Riveted hole 21 Locking hole 22, 23 Caulking hole 25 Through hole 26 Small diameter hole 27 Slit 31, 41 Membrane switch side terminal 32, 42 Horn device side terminal

Claims (1)

[Claims] A first contact portion having a first conductive film;
A membrane switch including a second contact portion having a second conductive film facing the back surface side of the first conductive film, and dots for separating the first and second conductive films from each other at normal times. In the leg portion extending to the switch portion of the membrane switch, the terminal of the first lead wire on the membrane switch side is hollow in the window portion of the support carrier where the first conductive film is exposed. The membrane switch side terminal of the second lead wire is connected to the first conductive film by a rivet, and the second conductive film is connected to the second conductive film by a hollow rivet in the window portion of the support where the second conductive film is exposed. A membrane switch for an airbag device, which is connected.