EP1256776B1 - Pyrotechnic igniting element on a circuit substrate through which it is linked to an electronic igniting component - Google Patents

Pyrotechnic igniting element on a circuit substrate through which it is linked to an electronic igniting component Download PDF

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Publication number
EP1256776B1
EP1256776B1 EP02009852A EP02009852A EP1256776B1 EP 1256776 B1 EP1256776 B1 EP 1256776B1 EP 02009852 A EP02009852 A EP 02009852A EP 02009852 A EP02009852 A EP 02009852A EP 1256776 B1 EP1256776 B1 EP 1256776B1
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EP
European Patent Office
Prior art keywords
ignition element
ignition
circuit carrier
carrier body
assembly
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Expired - Lifetime
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EP02009852A
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German (de)
French (fr)
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EP1256776A1 (en
Inventor
Thomas Görnig
Holger Wulff
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Conti Temic Microelectronic GmbH
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Conti Temic Microelectronic GmbH
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Publication of EP1256776A1 publication Critical patent/EP1256776A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators
    • F42B3/121—Initiators with incorporated integrated circuit

Definitions

  • the invention relates to an ignition element for pyrotechnic active compositions on a circuit carrier assembly with a Zündelektronikbauou according to the preamble of claim 1, as used in particular for the release of gas generators of occupant protection devices in motor vehicles.
  • Ignition elements for pyrotechnic active materials have an ignitable by the application of an electrical voltage wire, which is arranged on a circuit carrier assembly, which in turn also has a Zündelektronikbauner for providing the ignition energy and for communication with a data bus, such as.
  • the DE 44 35 319 A1, DE 196 10 799 C1 or WO 97/21067 can be found.
  • an ignitable layer is increasingly being used, which has hitherto always been deposited on the circuit carrier arrangement, as can be seen from EP 0 555 651 B1 or DE 196 29 104 C1.
  • DE 199 40 201 C1 proposes for further integration to use the surface of a component, preferably of the ignition capacitor, as circuit carrier and to achieve an extremely compact design on this surface by depositing conductor tracks and applying the further components including an ignition layer.
  • ignition devices are to be taken with a structural separation of pyrotechnics and electronics range, for example from DE 40 02 088 C1 or DE 198 36 280 C1, in which a protective wall is provided between pyrotechnic and ignition area, via electrical connections between the two areas.
  • the electronic module can indeed be well protected and, if necessary, also be manufactured independently of the pyrotechnic sector, however, the functionality is not completely tested by the manufacturer of the electronic module, since the ignition bridge must indeed be arranged in the pyrotechnic range.
  • the object of the invention is to introduce an ignition element, which is easy to manufacture and assemble and manufacturing separation of pyrotechnics and electronics allows, without having to sacrifice a complete functional check.
  • This object is solved by the features of claim 1.
  • Advantageous developments can be found in the dependent claims.
  • the basic idea is to use a carrier body separate from the circuit carrier arrangement for the ignition element and not to arrange the ignition element directly on the circuit carrier arrangement.
  • the carrier body of the ignition element is made in one piece from a non-conductive, heat-resistant and poorly heat-conducting material, for example glass or ceramic.
  • this carrier body can be aligned and integrated by its dimensions and its electrical contacts to the assembly and electrical contacting machines in the production of Zündelektronikbauner on the circuit carrier assembly, so as a very normal component to be mounted on the circuit carrier assembly.
  • the pyrotechnically effective electrical ignition layer itself is still safe safety, as long as it does not come together with the pyrotechnic active material.
  • the circuit carrier assembly can be so but completely equipped including the ignition element in normal electrical assembly halls, transported as a finished assembly without special security measures and stored and so are checked at any time already fully on electrical functionality.
  • the manufacturer of the finished circuit carrier assembly can in turn acquire the ignition element as a vendor part of a pyrotechnics specialist and does not need to have any special devices for their application or assembly ready.
  • the ignition element is self-trading and exchangeable unit, which leads to corresponding rationalization and specialization effects.
  • the carrier body is in turn protects the circuit carrier assembly from the effects of the burnup of the pyrotechnic active mass.
  • the carrier body also allows a variable mounting orientation of the circuit carrier assembly with respect to the pyrotechnic active mass, since the ignition bridge can be arranged on the support body not only on the top, but also on the side surface and so a perpendicular from the pyrotechnic active mass away arrangement of the circuit carrier assembly is possible, without the need for elaborate transducer or contacts for the ignition element would be required.
  • FIG. 1 shows a sectional view through a particularly preferred embodiment of the ignition device, as it is to be used as an igniter for a gas generator of an occupant protection device, for example.
  • An airbag in a motor vehicle.
  • the ignition device consists of an ignition element 10 with a Zünd Portugaln GmbH 1, which is arranged on a separate carrier body 11 and connected via contacts 12 with a circuit carrier assembly 2, which in turn also receives the ignition electronics module 6.
  • the carrier body 11 can be selected to be largely free from the constraints otherwise required for circuit carrier arrangements from a pressure-resistant, heat-resistant as well as hardly thermally conductive material, for example from ceramic.
  • the carrier body 11 can be dimensioned without significant cost increases in its dimensions to the components used for the other components on the circuit carrier assembly, In particular, the Zündelektronikbauè 6 adapted and processed in one operation or by a placement machine.
  • FIG. 2 shows, as an example, such an ignition element 10 with a carrier body 11 corresponding to the SMD standard design 1206, metallizations 13, and laterally peripheral contacts 12.
  • the carrier body 11 basically has metallizations 13 which on the one hand form the contact surfaces for the ignition bridge layer 1 and on the other hand lead to the contacts 12 to the circuit carrier arrangement 2 or form these contacts themselves, i. the contacts 12 are special formations of the metallizations 13, if necessary with additional reflow solder coating.
  • the contacts 12 of the ignition element 10 are designed so that they also contacted together with the contacts of the ignition electronics module 6 in one operation on the circuit carrier assembly 2, here SMD reflow soldered in this example.
  • FIG. 3 shows that the ignition bridge layer 1 can be arranged on a side surface 11s of the carrier body with respect to the contacts 12 on the underside 11u, or the ignition element 10 can be mounted correspondingly aligned.
  • the particularly preferred longitudinal alignment is possible, as shown in Figure 1, in which the carrier body 11 of the ignition element 10 is disposed at one, here the upper end of the circuit carrier assembly 2.
  • Circuit carrier assembly 2 and igniter 10 touch only at this end the pyrotechnic active mass 3 and are otherwise already surrounded by a pressure-elastic and shock-absorbing sheath 4.
  • the ignition electronics module 6 is arranged on the other end of the circuit carrier assembly 2 and thus largely alone due to the alignment and spacing are protected against the effects of burning the pyrotechnic active mass 3.
  • the pyrotechnic region A of the ignition device is separated from the electronics region B, wherein the separation is formed either by a protective wall 7c (see Fig. 4) or as a particularly preferred embodiment directly from a sheath 5 of the electronics area B with a corresponding pressure and heat resistant material, as shown in Fig. 1.
  • the carrier assembly 2 is also at least partially enveloped in the pyrotechnic region A by a pressure-absorbing material 4.
  • This pressure-absorbing material 4 for example a softglobe top, protects by its plastic or elastic deformability both the part 2a of the carrier arrangement 2 located in the pyrotechnic region A.
  • a subdivision is divided by a two-part cladding of the carrier arrangement into pyrotechnic region A and electronics region B.
  • the carrier assembly 2 in Figure 1 also has as a special feature at least one separation point 23 for separating the located in the pyrotechnic portion 2a of the carrier assembly 2 of the remaining carrier assembly 2b after the ignition of the pyrotechnic active mass 3, wherein the separation points 23 are preferably dimensioned so that they only when exceeding a predetermined thermal and / or mechanical limit load during the burning of the pyrotechnic active mass 3, the carrier assembly 2 separate.
  • the separation that has taken place can also be detected on the remaining and interrupted line ends on the carrier arrangement 2. The separation ensures that no or at least no forces exceeding the limit load are forwarded via the carrier arrangement 2 to the electronic module 6.
  • the carrier assembly 2 may be configured, for example, of ceramic material with corresponding metallic deposits of conductor track structures and contact zones and the separation point 23 there be formed as a predetermined breaking point, as shown in Figure 1.
  • the electronic assembly 6 consists of electronic components for controlling the ignition device via an energy and data bus to which the ignition device is connected via the contacts 8, a protection circuit against interference on the data bus and an ignition energy storage, in particular a firing capacitor and optionally other components. It is crucial that the electronic assembly even after the separation of the pyrotechnic part 2a of the support assembly with the ignition element 10 still continue to perform its other functions, ie in particular the self-diagnosis and data bus communication, but at least not hindered the data exchange on the bus system.
  • the circuit carrier assembly 2 may also consist of two separate parts 2a and 2b, which are connected for example by a solder connection before the ignition of the pyrotechnic active mass 3 and due to the heat melts during burning.
  • the Lotstelle (s) as an alternative embodiment of the separation point (s) 23 is / (are) to be dimensioned so that it meets both mechanical and thermal requirements in motor vehicle operation and can also conduct the ignition to the ignition bridge 1, without melting , However, since the released during combustion of the pyrotechnic active mass 3 amount of heat significantly above these loads, the Lotstelle can be dimensioned with appropriate security, especially since a melting of Lotstelle sufficient to forward the transfer of forces from the pyrotechnic area A in the electronics area B via the circuit carrier assembly 2 prevent.
  • the circuit carrier arrangement 2 in FIG. 1 is also preferably at least partially enveloped in the pyrotechnic pool A by a pressure-absorbing material 4, which is softer than the material of the protective wall 7c or the enclosure 5 in the electronics area B.
  • This pressure-absorbing material 4 for example a softglobtop, protects due to its plastic or elastic deformability, both the part 2a of the carrier arrangement 2 located in the pyrotechnic region A and the protective wall 7c or the envelope 5, whose pressure resistance is therefore dimensioned smaller or the total safety can be further increased.
  • This pressure-absorbing material 4 is elastic so far that at least when exceeding the limit load on the pyrotechnic part 2a of the circuit carrier assembly 2, the separation points are severed.
  • FIGS. 4 and 5 now show an alternative form of assembly of the ignition device with an ignition element 10 with a separate carrier body 11, which is arranged here on a circuit carrier arrangement 2 extending transversely thereto, wherein the ignition electronic module 6 on the circuit carrier arrangement 2 is additionally protected by a protective wall 7c.
  • the ignition element 10 may again be enveloped with a recess of the region of the ignitable layer 1 with a pressure-absorbing material 4.

Description

Die Erfindung betrifft ein Zündelement für pyrotechnische Wirkmassen auf einer Schaltungsträgeranordnung mit einer Zündelektronikbaugruppe gemäß dem Oberbegriff des Anspruchs 1, wie sie insbesondere für die Auslösung von Gasgeneratoren von Insassenschutzeinrichtungen in Kraftfahrzeugen eingesetzt werden.The invention relates to an ignition element for pyrotechnic active compositions on a circuit carrier assembly with a Zündelektronikbaugruppe according to the preamble of claim 1, as used in particular for the release of gas generators of occupant protection devices in motor vehicles.

Zündelemente für pyrotechnische Wirkmassen weisen einen durch das Anlegen einer elektrischen Spannung zündfähigen Draht auf, der auf einer Schaltungsträgeranordnung angeordnet ist, die ihrerseits auch eine Zündelektronikbaugruppe zur Bereitstellung der Zündenergie und zur Kommunikation mit einem Datenbus aufweist, wie bspw. der DE 44 35 319 A1, DE 196 10 799 C1 oder WO 97/21067 zu entnehmen ist. Anstelle des Drahtes wird zunehmend eine zündfähige Schicht verwendet, die bisher immer auf der Schaltungsträgeranordnung abgeschieden wurde, wie aus der EP 0 555 651 B1 oder DE 196 29 104 C1 zu entnehmen ist.Ignition elements for pyrotechnic active materials have an ignitable by the application of an electrical voltage wire, which is arranged on a circuit carrier assembly, which in turn also has a Zündelektronikbaugruppe for providing the ignition energy and for communication with a data bus, such as. The DE 44 35 319 A1, DE 196 10 799 C1 or WO 97/21067 can be found. Instead of the wire, an ignitable layer is increasingly being used, which has hitherto always been deposited on the circuit carrier arrangement, as can be seen from EP 0 555 651 B1 or DE 196 29 104 C1.

Die DE 199 40 201 C1 schlägt zur weiteren Integration vor, die Oberfläche eines Bauelements, vorzugsweise des Zündkondensators, als Schaltungsträger zu verwenden und auf dieser Oberfläche durch Abscheiden von Leiterbahnen und Aufbringen der weiteren Bauelemente einschließlich einer Zündschicht eine äußerst kompakte Bauform zu erreichen.DE 199 40 201 C1 proposes for further integration to use the surface of a component, preferably of the ignition capacitor, as circuit carrier and to achieve an extremely compact design on this surface by depositing conductor tracks and applying the further components including an ignition layer.

Alle diese Zündeinrichtungen weisen jedoch das Problem auf, dass ein Hersteller einer solchen Zündeinrichtung sowohl die Bestückung der Schaltungsträgeranordnung als auch die Zündbrückenschicht, oft sogar die gesamte Pyrotechnik montieren und entsprechende Sicherheitsanforderungen erfüllen muß. Gerade jedoch der Pyrotechnikbereich erfordert dabei besonders hohe Sicherheitsanforderungen und spezielle Vorrichtungen zur Bestückung und Montage.However, all of these ignition devices have the problem that a manufacturer of such an ignition device must assemble both the assembly of the circuit carrier assembly and the Zündbrückenschicht, often even the entire pyrotechnics and meet the corresponding safety requirements. Especially the pyrotechnic sector requires particularly high safety requirements and special equipment for assembly and assembly.

Darüber hinaus sind Zündeinrichtungen mit einer baulichen Trennung von Pyrotechnikbereich und Elektronikbereich beispielsweise aus der DE 40 02 088 C1 oder DE 198 36 280 C1 zu entnehmen, bei denen zwischen Pyrotechnikbereich und Zündbereich eine Schutzwand vorgesehen ist, die über elektrische Verbindungen zwischen beiden Bereichen verfügt. Dadurch kann die Elektronikbaugruppe zwar gut geschützt werden und gegebenenfalls auch unabhängig von dem Pyrotechnikbereich hergestellt werden, nicht jedoch die Funktionsweise vollständig beim Hersteller der Elektronikbaugruppe geprüft werden, da die Zündbrücke ja im Pyrotechnikbereich angeordnet werden muß.In addition, ignition devices are to be taken with a structural separation of pyrotechnics and electronics range, for example from DE 40 02 088 C1 or DE 198 36 280 C1, in which a protective wall is provided between pyrotechnic and ignition area, via electrical connections between the two areas. As a result, the electronic module can indeed be well protected and, if necessary, also be manufactured independently of the pyrotechnic sector, however, the functionality is not completely tested by the manufacturer of the electronic module, since the ignition bridge must indeed be arranged in the pyrotechnic range.

Aufgabe der Erfindung ist es, ein Zündelement vorzustellen, welches einfach herstellbar und montierbar ist und fertigungstechnische Trennung von Pyrotechnik und Elektronik ermöglicht, ohne dass auf eine vollständige Funktionsüberprüfung verzichtet werden müßte. Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen sind den Unteransprüchen zu entnehmen. Grundgedanke ist dabei, einen von der Schaltungsträgeranordnung separaten Trägerkörper für das Zündelement zu verwenden und das Zündelement gerade nicht direkt auf der Schaltungsträgeranordnung anzuordnen. Dies widerspricht zwar dem allgemeinen Bestrebungen nach Verkleinerung und komplexerer Bauweise, bringt jedoch erhebliche Vorteile bei der Herstellung und in der Funktionssicherheit.The object of the invention is to introduce an ignition element, which is easy to manufacture and assemble and manufacturing separation of pyrotechnics and electronics allows, without having to sacrifice a complete functional check. This object is solved by the features of claim 1. Advantageous developments can be found in the dependent claims. The basic idea is to use a carrier body separate from the circuit carrier arrangement for the ignition element and not to arrange the ignition element directly on the circuit carrier arrangement. Although this contradicts the general efforts for reduction and more complex design, but brings significant advantages in the production and in the reliability.

Der Trägerkörper des Zündelements ist einstückig aus einem nichtleitenden, hitzebeständigen und schlecht wärmeleitenden Material, bspw. Glas oder Keramik.The carrier body of the ignition element is made in one piece from a non-conductive, heat-resistant and poorly heat-conducting material, for example glass or ceramic.

So kann dieser Trägerkörper von seinen Abmaßen und seinen elektrischen Kontakten an die Bestückungs- und elektrischen Kontaktierautomaten in der Produktion der Zündelektronikbaugruppe auf der Schaltungsträgeranordnung ausgerichtet und einbezogen, also wie ein ganz normales Bauelement mit auf der Schaltungsträgeranordnung montiert werden. Die pyrotechnisch wirksame elektrische Zündschicht selbst ist dabei noch sicherheitsunbedenklich, solange sie nicht mit der pyrotechnischen Wirkmasse zusammenkommt. Die Schaltungsträgeranordnung kann so aber vollständig einschließlich des Zündelements in normalen Elektromontagehallen bestückt, als fertige Baugruppe ohne besondere Sicherheitsmaßnahmen transportiert und gelagert und so auch jederzeit bereits vollständig auf elektrische Funktionsfähigkeit geprüft werden. Der Hersteller der fertigen Schaltungsträgeranordnung kann seinerseits das Zündelement als Zulieferteil von einem Pyrotechnikspezialisten erwerben und braucht keine speziellen Vorrichtungen zu deren Aufbringung bzw. Montage bereitzuhalten. Das Zündelement wird eigenständig handel- und austauschbare Einheit, was zu entsprechenden Rationalisierungs- und Spezialisierungseffekten führt.Thus, this carrier body can be aligned and integrated by its dimensions and its electrical contacts to the assembly and electrical contacting machines in the production of Zündelektronikbaugruppe on the circuit carrier assembly, so as a very normal component to be mounted on the circuit carrier assembly. The pyrotechnically effective electrical ignition layer itself is still safe safety, as long as it does not come together with the pyrotechnic active material. The circuit carrier assembly can be so but completely equipped including the ignition element in normal electrical assembly halls, transported as a finished assembly without special security measures and stored and so are checked at any time already fully on electrical functionality. The manufacturer of the finished circuit carrier assembly can in turn acquire the ignition element as a vendor part of a pyrotechnics specialist and does not need to have any special devices for their application or assembly ready. The ignition element is self-trading and exchangeable unit, which leads to corresponding rationalization and specialization effects.

Der Trägerkörper ist schützt seinerseits so die Schaltungsträgeranordnung vor den Einflüssen des Abbrandes der pyrotechnischen Wirkmasse.The carrier body is in turn protects the circuit carrier assembly from the effects of the burnup of the pyrotechnic active mass.

Der Trägerkörper ermöglicht zudem eine variable Montageausrichtung der Schaltungsträgeranordnung bezüglich der pyrotechnischen Wirkmasse, da die Zündbrücke auf dem Trägerkörper nicht nur auf dessen Oberseite, sondem auch auf der Seitenfläche angeordnet werden kann und so eine senkrecht von der pyrotechnischen Wirkmasse weg verlaufende Anordnung der Schaltungsträgeranordnung möglich ist, ohne dass es aufwendige Aufnehmer oder Kontakte für das Zündelement erforderlich wären.The carrier body also allows a variable mounting orientation of the circuit carrier assembly with respect to the pyrotechnic active mass, since the ignition bridge can be arranged on the support body not only on the top, but also on the side surface and so a perpendicular from the pyrotechnic active mass away arrangement of the circuit carrier assembly is possible, without the need for elaborate transducer or contacts for the ignition element would be required.

Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen und Figuren näher erläutert werden. Kurze Beschreibung der Figuren:

Figur 1
Zündeinrichtung mit einem Zündelement auf einem separaten Trägerkörper und Längsausrichtung der Schaltungsträgeranordnung
Figur 2
Zündelement mit Zündschicht als SMD-Bauform
Figur 3
Zündelement in Ausrichtung der Zündschicht auf der Seitenfläche
Figur 4
Zündeinrichtung mit einem Zündelement in Querausrichtung
Figur 5
Draufsicht auf die Schaltungsträgeranordnung gemäß Figur 4
The invention will be explained in more detail with reference to embodiments and figures. Brief description of the figures:
FIG. 1
Ignition device with an ignition element on a separate carrier body and longitudinal alignment of the circuit carrier assembly
FIG. 2
Ignition element with ignition layer as SMD design
FIG. 3
Ignition element in alignment of the ignition on the side surface
FIG. 4
Ignition device with an ignition element in transverse alignment
FIG. 5
Top view of the circuit carrier assembly of Figure 4

Die Figur 1 zeigt eine Schnittdarstellung durch eine besonders bevorzugte Ausgestaltung der Zündeinrichtung, wie sie als Zünder für einen Gasgenerator einer Insassenschutzeinrichtung, bspw. eines Airbags, in einem Kraftfahrzeug eingesetzt werden soll.1 shows a sectional view through a particularly preferred embodiment of the ignition device, as it is to be used as an igniter for a gas generator of an occupant protection device, for example. An airbag, in a motor vehicle.

Die Zündeinrichtung besteht aus einem Zündelement 10 mit einer Zündbrückenschicht 1, die auf einem separaten Trägerkörper 11 angeordnet und über Kontakte 12 mit einer Schaltungsträgeranordnung 2 verbunden ist, die ihrerseits auch die Zündelektronikbaugruppe 6 aufnimmt.The ignition device consists of an ignition element 10 with a Zündbrückenschicht 1, which is arranged on a separate carrier body 11 and connected via contacts 12 with a circuit carrier assembly 2, which in turn also receives the ignition electronics module 6.

Der Trägerkörper 11 kann dabei im Gegensatz zu einer Direktanordnung der Zündbrückenschicht 1 auf der Schaltungsträgeranordnung 2 weitgehend frei von den sonst bei Schaltungsträgeranordnungen prozeßbedingt erforderlichen Beschränkungen aus einem druck- sowie hitzebeständigen als auch kaum wärmeleitenden Material gewählt werden, bspw. aus Keramik. Zudem kann der Trägerkörper 11 ohne nennenswerte Kostenerhöhungen in seinen Abmaßen an die für die sonstigen Bauelemente auf der Schaltungsträgeranordnung verwendeten Bauelemente, insbesondere die Zündelektronikbaugruppe 6 angepaßt und so in einem Arbeitsgang bzw. von einem Bestückungsautomaten verarbeitet werden.In contrast to a direct arrangement of the ignition bridge layer 1 on the circuit carrier arrangement 2, the carrier body 11 can be selected to be largely free from the constraints otherwise required for circuit carrier arrangements from a pressure-resistant, heat-resistant as well as hardly thermally conductive material, for example from ceramic. In addition, the carrier body 11 can be dimensioned without significant cost increases in its dimensions to the components used for the other components on the circuit carrier assembly, In particular, the Zündelektronikbaugruppe 6 adapted and processed in one operation or by a placement machine.

Figur 2 zeigt als ein Beispiel ein solches Zündelement 10 mit einem der SMD-Standardbauform 1206 entsprechenden Trägerkörper 11, Metallisierungen 13 und seitlich umlaufenden Kontakten 12.FIG. 2 shows, as an example, such an ignition element 10 with a carrier body 11 corresponding to the SMD standard design 1206, metallizations 13, and laterally peripheral contacts 12.

Der Trägerkörper 11 weist grundsätzlich Metallisierungen 13 auf, die einerseits die Kontaktflächen für die Zündbrückenschicht 1 bilden und andererseits zu den Kontakten 12 zur Schaltungsträgeranordnung 2 führen bzw. diese Kontakte selbst bilden, d.h. die Kontakte 12 spezielle Ausformungen der Metallisierungen 13, ggfs. mit zusätzlicher Reflow-Lotbeschichtung sind. Die Kontakte 12 des Zündelements 10 sind dabei so gestaltet, dass sie auch zusammen mit den Kontakten der Zündelektronikbaugruppe 6 in einem Arbeitsgang auf der Schaltungsträgeranordnung 2 kontaktiert, hier in diesem Beispiel SMD-reflowgelötet werden können.The carrier body 11 basically has metallizations 13 which on the one hand form the contact surfaces for the ignition bridge layer 1 and on the other hand lead to the contacts 12 to the circuit carrier arrangement 2 or form these contacts themselves, i. the contacts 12 are special formations of the metallizations 13, if necessary with additional reflow solder coating. The contacts 12 of the ignition element 10 are designed so that they also contacted together with the contacts of the ignition electronics module 6 in one operation on the circuit carrier assembly 2, here SMD reflow soldered in this example.

Figur 3 skizziert dabei, daß die Zündbrückenschicht 1 auf einer Seitenfläche 11s des Trägerkörpers bezüglich der Kontakte 12 auf der Unterseite 11u angeordnet bzw. das Zündelement 10 entsprechend ausgerichtet montiert werden kann. Dadurch wird die besonders bevorzugte Längsausrichtung möglich, wie sie in Figur 1 dargestellt ist, bei welcher der Trägerkörper 11 des Zündelements 10 an einem, hier dem oberen Ende der Schaltungsträgeranordnung 2 angeordnet ist. Schaltungsträgeranordnung 2 und Zündelement 10 berühren nur an diesem Ende die pyrotechnische Wirkmasse 3 und sind ansonsten bereits durch eine druckelastische und stoßabsorbierende Umhüllung 4 umgeben. Die mit der zündfähigen Schicht 1 versehene Seitenfläche 11s entsprechend diesem Ende zur pyrotechnischen Wirkmasse 3 hin ausgerichtet. Beabstandet von dem Zündelement 10 und der pyrotechnischen Wirkmasse 3 ist auf dem anderen Ende der Schaltungsträgeranordnung 2 die Zündelektronikbaugruppe 6 angeordnet und so allein schon aufgrund der Ausrichtung und Beabstandung weitgehend gegen Einflüsse des Abbrands der pyrotechnischen Wirkmasse 3 geschützt sind.FIG. 3 shows that the ignition bridge layer 1 can be arranged on a side surface 11s of the carrier body with respect to the contacts 12 on the underside 11u, or the ignition element 10 can be mounted correspondingly aligned. Thereby, the particularly preferred longitudinal alignment is possible, as shown in Figure 1, in which the carrier body 11 of the ignition element 10 is disposed at one, here the upper end of the circuit carrier assembly 2. Circuit carrier assembly 2 and igniter 10 touch only at this end the pyrotechnic active mass 3 and are otherwise already surrounded by a pressure-elastic and shock-absorbing sheath 4. The provided with the ignitable layer 1 side surface 11s aligned according to this end to the pyrotechnic active mass 3 out. Spaced apart from the ignition element 10 and the pyrotechnic active mass 3, the ignition electronics module 6 is arranged on the other end of the circuit carrier assembly 2 and thus largely alone due to the alignment and spacing are protected against the effects of burning the pyrotechnic active mass 3.

Der Pyrotechnikbereich A der Zündeinrichtung ist vom Elektronikbereich B abgetrennt, wobei die Abtrennung entweder durch eine Schutzwand 7c (vgl. Fig. 4) oder als besonders bevorzugte Ausgestaltung direkt aus einer Umhüllung 5 des Elektronikbereichs B mit einem entsprechend druck- und hitzebeständigen Material ausgebildet wird, wie in Fig. 1 gezeigt wird.The pyrotechnic region A of the ignition device is separated from the electronics region B, wherein the separation is formed either by a protective wall 7c (see Fig. 4) or as a particularly preferred embodiment directly from a sheath 5 of the electronics area B with a corresponding pressure and heat resistant material, as shown in Fig. 1.

Die Trägeranordnung 2 ist zudem im Pyrotechnikbereich A zumindest teilweise von einem druckabsorbierenden Material 4 umhüllt. Dieses druckabsorbierenden Material 4, bspw. ein Softglobtop, schützt durch seine gewisse plastische oder elastische Verformbarkeit sowohl den im Pyrotechnikbereich A befindlichen Teil 2a der Trägeranordnung 2. Es sich ergibt also eine Unterteilung durch eine zweiteilige Umhüllung der Trägeranordnung unterteilt nach Pyrotechnikbereich A und Elektronikbereich B.The carrier assembly 2 is also at least partially enveloped in the pyrotechnic region A by a pressure-absorbing material 4. This pressure-absorbing material 4, for example a softglobe top, protects by its plastic or elastic deformability both the part 2a of the carrier arrangement 2 located in the pyrotechnic region A. Thus, a subdivision is divided by a two-part cladding of the carrier arrangement into pyrotechnic region A and electronics region B.

Die Trägeranordnung 2 in Figur 1 weist zudem als Besonderheit zumindest eine Trennstelle 23 zur Abtrennung des im Pyrotechnikbereich befindlichen Teils 2a der Trägeranordnung 2 von der restlichen Trägeranordnung 2b nach der Zündung der pyrotechnischen Wirkmasse 3 auf, wobei die Trennstellen 23 vorzugsweise so dimensioniert sind, dass sie nur bei Überschreitung einer vorgegebenen thermischen und/oder mechanischen Grenzbelastung während des Abbrands der pyrotechnischen Wirkmasse 3 die Trägeranordnung 2 trennen. Die erfolgte Abtrennung kann auch die verbleibenden und unterbrochenen Leitungsenden auf der Trägeranordnung 2 erfasst werden. Die Abtrennung sorgt dafür, dass keine bzw. zumindest keine die Grenzbelastung übersteigenden Kräfte über die Trägeranordnung 2 auf die Elektronikbaugruppe 6 weitergeleitet werden.The carrier assembly 2 in Figure 1 also has as a special feature at least one separation point 23 for separating the located in the pyrotechnic portion 2a of the carrier assembly 2 of the remaining carrier assembly 2b after the ignition of the pyrotechnic active mass 3, wherein the separation points 23 are preferably dimensioned so that they only when exceeding a predetermined thermal and / or mechanical limit load during the burning of the pyrotechnic active mass 3, the carrier assembly 2 separate. The separation that has taken place can also be detected on the remaining and interrupted line ends on the carrier arrangement 2. The separation ensures that no or at least no forces exceeding the limit load are forwarded via the carrier arrangement 2 to the electronic module 6.

Die Trägeranordnung 2 kann beispielsweise aus keramischem Material mit entsprechenden metallischen Abscheidungen von Leitbahnstrukturen und Kontaktzonen ausgestaltet sein und die Trennstelle 23 dort als Sollbruchstelle ausgebildet werden, wie dies in Figur 1 dargestellt ist.The carrier assembly 2 may be configured, for example, of ceramic material with corresponding metallic deposits of conductor track structures and contact zones and the separation point 23 there be formed as a predetermined breaking point, as shown in Figure 1.

Die Elektronikbaugruppe 6 besteht aus elektronischen Bauelementen zur Ansteuerung der Zündeinrichtung über einen Energie- und Datenbus, mit dem die Zündeinrichtung über die Kontakte 8 verbunden ist, einer Schutzschaltung gegen Störungen auf dem Datenbus sowie einem Zündenergiespeicher, insbesondere einem Zündkondensator sowie gegebenenfalls weiteren Bauelementen. Entscheidend ist dabei, daß die Elektronikbaugruppe auch nach der Abtrennung des pyrotechnischen Teils 2a der Trägeranordnung mit dem Zündelement 10 noch weiterhin seine sonstigen Funktionen, also insbesondere die Eigendiagnose und Datenbuskommunikation weiter ausführen kann, zumindest aber den Datenaustausch auf dem Bussystem nicht behindert.The electronic assembly 6 consists of electronic components for controlling the ignition device via an energy and data bus to which the ignition device is connected via the contacts 8, a protection circuit against interference on the data bus and an ignition energy storage, in particular a firing capacitor and optionally other components. It is crucial that the electronic assembly even after the separation of the pyrotechnic part 2a of the support assembly with the ignition element 10 still continue to perform its other functions, ie in particular the self-diagnosis and data bus communication, but at least not hindered the data exchange on the bus system.

Die Schaltungsträgeranordnung 2 kann auch aus zwei getrennten Teilen 2a und 2b bestehen, die beispielweise durch eine Lotverbindung vor der Zündung der pyrotechnischen Wirkmasse 3 verbunden sind und die aufgrund der Wärmeentwicklung während des Abbrands aufschmilzt. Die Lotstelle(n) als alternative Ausgestaltung der Trennstelle(n) 23 ist/(sind) dabei so zu dimensionieren, dass sie sowohl mechanischen als auch thermischen Anforderungen im Kfz-Betrieb genügt und auch den Zündstrom zur Zündbrücke 1 leiten kann, ohne zu schmelzen. Da jedoch die beim Abbrand der pyrotechnischen Wirkmasse 3 freiwerdende Wärmemenge deutlich über diesen Belastungen liegt, kann die Lotstelle mit entsprechender Sicherheit dimensioniert werden zumal bereits ein Anschmelzen der Lotstelle ausreicht, um die Weiterleitung von Kräften vom Pyrotechnikbereich A in den Elektronikbereich B über die Schaltungsträgeranordnung 2 zu verhindern.The circuit carrier assembly 2 may also consist of two separate parts 2a and 2b, which are connected for example by a solder connection before the ignition of the pyrotechnic active mass 3 and due to the heat melts during burning. The Lotstelle (s) as an alternative embodiment of the separation point (s) 23 is / (are) to be dimensioned so that it meets both mechanical and thermal requirements in motor vehicle operation and can also conduct the ignition to the ignition bridge 1, without melting , However, since the released during combustion of the pyrotechnic active mass 3 amount of heat significantly above these loads, the Lotstelle can be dimensioned with appropriate security, especially since a melting of Lotstelle sufficient to forward the transfer of forces from the pyrotechnic area A in the electronics area B via the circuit carrier assembly 2 prevent.

Die Schaltungsträgeranordnung 2 in Figur 1 ist zudem vorzugsweise im Pyrotechnikbeteich A zumindest teilweise von einem druckabsorbierenden Material 4 umhüllt, welches weicher ist als das Material der Schutzwand 7c bzw. der Umhüllung 5 im Elektronikbereich B. Dieses druckabsorbierenden Material 4, bspw. ein Softglobtop, schützt durch seine gewisse plastische oder elastische Verformbarkeit sowohl den im Pyrotechnikbereich A befindlichen Teil 2a der Trägeranordnung 2 als auch die Schutzwand 7c bzw. die Umhüllung 5, deren Druckbeständigkeit daher geringer dimensioniert bzw. die Gesamtsicherheit weiter erhöht werden kann. Dieses druckabsorbierende Material 4 ist soweit elastisch, dass zumindest bei Überschreitung der Grenzbelastung an dem pyrotechnischen Teil 2a der Schaltungsträgeranordnung 2 die Trennstellen durchtrennt werden.The circuit carrier arrangement 2 in FIG. 1 is also preferably at least partially enveloped in the pyrotechnic pool A by a pressure-absorbing material 4, which is softer than the material of the protective wall 7c or the enclosure 5 in the electronics area B. This pressure-absorbing material 4, for example a softglobtop, protects due to its plastic or elastic deformability, both the part 2a of the carrier arrangement 2 located in the pyrotechnic region A and the protective wall 7c or the envelope 5, whose pressure resistance is therefore dimensioned smaller or the total safety can be further increased. This pressure-absorbing material 4 is elastic so far that at least when exceeding the limit load on the pyrotechnic part 2a of the circuit carrier assembly 2, the separation points are severed.

Figur 4 und 5 zeigen nun noch eine alternative Montageform der Zündeinrichtung mit einem Zündelement 10 mit separatem Trägerkörper 11, welches hier auf einer quer dazu verlaufenden Schaltungsträgeranordnung 2 angeordnet ist, wobei die Zündelektronikbaugruppe 6 auf der Schaltungsträgeranordnung 2 hierbei durch eine Schutzwand 7c zusätzlich geschützt wird. Das Zündelement 10 kann jedoch wiederum unter Aussparung des Bereichs der zündfähigen Schicht 1 mit einem druckabsorbierenden Material 4 umhüllt sein.FIGS. 4 and 5 now show an alternative form of assembly of the ignition device with an ignition element 10 with a separate carrier body 11, which is arranged here on a circuit carrier arrangement 2 extending transversely thereto, wherein the ignition electronic module 6 on the circuit carrier arrangement 2 is additionally protected by a protective wall 7c. However, the ignition element 10 may again be enveloped with a recess of the region of the ignitable layer 1 with a pressure-absorbing material 4.

Claims (9)

  1. Ignition element (10) for pyrotechnic active masses (3), wherein the ignition element (10) is arranged on a circuit carrier arrangement (2) and connected via the circuit carrier arrangement (2) to an electronic ignition assembly (6), characterized in that the ignition element (10) comprises a carrier body (11) that is separated from the circuit carrier arrangement (2) and comprises contacting means (12) for electrically contacting the ignition element (10) to the circuit carrier arrangement (2).
  2. Ignition element according to claim 1, characterized in that the electronic ignition assembly (6) consists of standard components with dimensions standardized for insertion machines and the carrier body (11) of the ignition element (10) also comprises these standardized dimensions and can be mounted onto the circuit carrier arrangement (2) by means of the same insertion machines.
  3. Ignition element according to claim 1 or 2, characterized in that the contacting means (12) of the ignition element (10) are configured in such a manner that they can be contacted on the circuit carrier arrangement (2) together with the contacting means of the electronic ignition assembly (6) in a single operation.
  4. Ignition element according to any one of the preceding claims, characterized in that the contacting means (12) of the carrier body (11) are SMD solderable.
  5. Ignition element according to any one of the preceding claims, characterized in that the ignition element (10) comprises an electrically ignitable layer (1) that is deposited on the separate carrier body.
  6. Ignition element according to any one of the preceding claims, characterized in that the carrier body (11) of the ignition element is a single-piece body consisting of a non-conductive and heat resistant material of poor thermal conductivity.
  7. Ignition element according to claim 5, characterized in that the carrier body (11) of the ignition element consists of a ceramic material or of glass.
  8. Ignition element according to any one of the preceding claims, characterized in that the ignitable layer (1) is arranged on a side face (11s) of the carrier body relative to the contacting means (12) on the bottom of the carrier body (11u).
  9. Ignition element according to any one of the preceding claims, characterized in that the carrier body (11) of the ignition element is arranged at one end of the circuit carrier arrangement (2) and the side face (11s) provided with the ignition element is aligned corresponding to this end, the pyrotechnic active mass (3) is contacted by this end, and the electronic ignition assembly (6) is arranged at the other end of the circuit carrier arrangement (2) and spaced apart from the ignition element (10).
EP02009852A 2001-05-12 2002-05-02 Pyrotechnic igniting element on a circuit substrate through which it is linked to an electronic igniting component Expired - Lifetime EP1256776B1 (en)

Applications Claiming Priority (2)

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DE10123285A DE10123285A1 (en) 2001-05-12 2001-05-12 Ignition element for pyrotechnic active materials on a circuit carrier arrangement with an ignition electronics module
DE10123285 2001-05-12

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EP1256776A1 EP1256776A1 (en) 2002-11-13
EP1256776B1 true EP1256776B1 (en) 2006-01-18

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DE10123285A1 (en) 2002-11-14
DE50205621D1 (en) 2006-04-06
EP1256776A1 (en) 2002-11-13
US6644199B2 (en) 2003-11-11
US20020166472A1 (en) 2002-11-14

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