초록 ▼

There is disclosed an electropyrotechnic igniter which contains two ignition heads each having a body containing a resisitive heating element and a pyrotechnic ignition composition. The two ignition heads also include a means of dialogue and of triggering coded information and a means of storing ele

There is disclosed an electropyrotechnic igniter which contains two ignition heads each having a body containing a resisitive heating element and a pyrotechnic ignition composition. The two ignition heads also include a means of dialogue and of triggering coded information and a means of storing electrical energy. The igniter also includes external connection means intended to be connected electrically to an electronic control unit. The igniter is intended to be used in motor vehicle safety, particular to constitute the ignition device of a gas generator associated with an airbag.

대표청구항 ▼

1. Electropyrotechnic igniter (101) with two ignition heads (102, 103), each of the said ignition heads comprising a body containing a resistive heating element (20) and a pyrotechnic ignition composition (16), wherein each of the two ignition heads comprises a means (49) of dialogue and of triggeri

1. Electropyrotechnic igniter (101) with two ignition heads (102, 103), each of the said ignition heads comprising a body containing a resistive heating element (20) and a pyrotechnic ignition composition (16), wherein each of the two ignition heads comprises a means (49) of dialogue and of triggering coded information and a means (46) of storing electrical energy, the said electropyrotechnic igniter comprising external connection means (154, 155) intended to be connected electrically to an electronic control unit, in each of the two ignition heads (102, 103), a transverse dividing wall (18) splitting the interior of the body into a downstream chamber containing the resistive heating element (20) and the pyrotechnic ignition composition (16), and an upstream chamber containing an electronic board (30) onto which the dialogue and triggering means (49) and the means (46) of storing electrical energy are integrated, the external connection means consisting of two external metal pins, each of which has: i) a first part (170,171) which lies in the continuation of the two electronic boards (30), ii) a second part (172, 173) arranged in a plane perpendicular to the plane in which the first part is contained. 2. Electropyrotechnic igniter (101) according to claim 1, wherein each of the two ignition heads (102, 103) comprises electrical connection means (22, 23), said electrical connection means passing through the transverse dividing wall and connecting the resistive heating element (20) to conducting tracks (36, 37) which are formed on the electronic board (30). 3. Electropyrotechnic igniter (101) according to claim 2, wherein, in each of the two ignition heads (102,103), the electrical connection means consists of metal connecting pins (22, 23). 4. Electropyrotechnic igniter (101) according to claim 1, wherein, the two electronic boards (30) are arranged at right angles to their respective transverse dividing wall. 5. Electropyrotechnic igniter (101) according to claim 1, wherein in each of the two ignition heads (102,103), the dialogue and triggering means (49) is placed on one of two flat faces (34) of the electronic board (30), and wherein means (46) of storing electrical energy is placed on another flat face (32) of electronic board (30). 6. Electropyrotechnic igniter (101) according to claim 1, wherein each resistive heating element consists of a thin-film resistive bridge. 7. Electropyrotechnic igniter (101) according to claim 6, wherein the thin-film resistive bridge consists of tantalum nitride, the thickness of which is between 0.01 μm and 1 μm. 8. Electropyrotechnic igniter (101) according to claim 6, wherein the thin-film resistive bridge consists of a layer of nickel/chrominum alloy, the thickness of which is between 0.01 μm and 1 μm. 9. Use of an electropyrotechinc igniter (101) according to claim 1 in a gas generator which is intended to inflate an airbag and which has an elongaged tubular body (201).