EP0150823B1 - Allumeur électrique - Google Patents

Allumeur électrique Download PDF

Info

Publication number
EP0150823B1
EP0150823B1 EP85100750A EP85100750A EP0150823B1 EP 0150823 B1 EP0150823 B1 EP 0150823B1 EP 85100750 A EP85100750 A EP 85100750A EP 85100750 A EP85100750 A EP 85100750A EP 0150823 B1 EP0150823 B1 EP 0150823B1
Authority
EP
European Patent Office
Prior art keywords
conductor path
ignition
electrode
conductor
ignition bridge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85100750A
Other languages
German (de)
English (en)
Other versions
EP0150823A2 (fr
EP0150823A3 (en
Inventor
Uwe Brede
Gerhard Kordel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dynamit Nobel AG
Original Assignee
Dynamit Nobel AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
Priority to AT85100750T priority Critical patent/ATE39758T1/de
Publication of EP0150823A2 publication Critical patent/EP0150823A2/fr
Publication of EP0150823A3 publication Critical patent/EP0150823A3/de
Application granted granted Critical
Publication of EP0150823B1 publication Critical patent/EP0150823B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F42B3/188—Safety initiators resistant to premature firing by static electricity or stray currents having radio-frequency filters, e.g. containing ferrite cores or inductances
    • 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
    • F42B3/124—Bridge initiators characterised by the configuration or material of the bridge

Definitions

  • the invention relates to an electrical ignition element with an electrically insulating carrier body which carries an ignition bridge and two electrodes connected to the ignition bridge, of which at least one electrode consists of a layered conductor track.
  • the electrodes mounted in layers on the carrier body are at the same time the connecting elements for connecting discrete components, such as Zener diodes, transistors, resistors or the like.
  • the conductor tracks have connection points at which the legs of the electrical components are soldered on.
  • further conductor tracks can be attached to the carrier body, which serve as connecting lines and for connecting discrete electrical components.
  • an electrical ignition device is known (DE-A-2 840 738), in which both electrodes are designed as surface electrodes which are connected to one another by a narrow conductor strip forming the ignition bridge.
  • the surface electrodes are separated from one another by an insulating cutout in the carrier body and are connected to one another exclusively by the ignition bridge.
  • the electrodes only have the function of current conductors, be it for the purpose of supplying current to the ignition bridge or for supplying current to the components of an electrical circuit which is attached to the carrier body.
  • Protective measures are known for securing ignition elements against unwanted triggering by high-frequency electromagnetic interference signals, see for example GB-A-1 419775.
  • series resistors, filter circuits and the like can be connected to the lines leading to the electrodes of the ignition element. are switched to prevent the transmission of the interference voltages to the ignition element.
  • series resistors have the disadvantage that they not only dampen the high-frequency interference voltages, but also cause a voltage drop in the DC voltage used for ignition, only the high-frequency interference signals are eliminated by frequency filters, while the DC properties of the ignition circuit remain unchanged.
  • the disadvantage of the usual protective circuits, which consist of discrete components, is that line sections lead from the protective circuit to the ignition bridge and that these line sections in turn form receiving antennas that can absorb high-frequency interference voltages. Particularly intensive shielding is therefore required in this area.
  • the invention has for its object to provide an electrical ignition element of the type mentioned, which is protected against high-frequency electromagnetic interference with simple means and effectively, without the need for complex shielding measures.
  • the conductor track is designed as a high-frequency filter.
  • the invention has the advantage that additional discrete components are not required for the implementation of the high-frequency filter and that the high-frequency filter is arranged in the immediate vicinity of the ignition bridge to be protected from high-frequency interference, so that there is no possibility of inducing interference voltages behind or in the high-frequency filter.
  • the ignition element can be realized with simple means and at low cost, since only the shape of one electrode or both electrodes can be changed compared to the existing ignition elements.
  • the electrode or electrode arrangement designed as a high-frequency filter does not have the function of a printed circuit board, but is an integral part of the electrical contacting of the ignition bridge, the filter components being produced by skillfully changing the connecting conductor tracks.
  • the high-frequency filter can either be designed as a band-pass filter or as a high-pass filter, so that the direct current or low-frequency alternating current used for the ignition can pass through the filter undamped.
  • the techniques in which conductor tracks are designed as inductors or capacitors are known from thick-film technology.
  • the conductor track is designed entirely or in sections as a series inductance with respect to the ignition bridge, areas of the conductor track running at substantially constant distances along non-linear paths, for example by B. the conductor track is spiral.
  • the inductance can, for. B. also have the shape of an open loop.
  • a series inductance has a filter effect. The voltage drop across it is proportional to the frequency. Their DC resistance is practically zero.
  • the conductor track having the series inductance can be designed in sections as a series capacitance with respect to the ignition bridge, in that the conductor track is designed geometrically outside the region of the inductance in such a way that regions arise which are opposite one another at a short distance.
  • the separation or interruption of these areas is preferably meandering.
  • a parallel resonant circuit can be formed from a series inductance and a series capacitance, which is in series with the ignition bridge.
  • the conductor track, together with a conductor track of the other electrode forms a parallel capacitance to the ignition bridge, the two conductor tracks running essentially parallel to one another at a close distance.
  • a parallel capacitance has the function of an interference suppression capacitor that short-circuits high-frequency vibrations
  • the ignition or ignition means shown in FIG. 1 has a cylindrical metallic jacket 1, which contains a metallic ground contact ring 2 lying against the inner wall of the jacket.
  • the end 3 of the ground contact ring 2 is bent inwards to form an inner flange.
  • the ground contact ring 2 contains an explosive 4 in the form of an explosive.
  • the primer 4 completely fills the ground contact ring 2 and the opening delimited by the bent end 3.
  • an insulating body 5 is arranged in the jacket 1, which contains a layer element 6 which is in direct contact with the primer 4.
  • the end of the layer element 6 facing away from the primer 4 is in contact with a metallic pole piece 7, likewise enclosed by the insulating housing 5, which protrudes through an opening in the insulating housing 5 and forms the contact to an ignition generator, the jacket 1 connecting the second electrode to the connection represents an ignition generator.
  • the layer element 6 consists of a cylindrical insulating carrier body 8 which has a central bore 9.
  • the first electrode 10 consists of a conductor track which forms a layer covering the upper end face of the carrier body 8, which is subdivided by an interruption 11 of a spiral shape.
  • the interruption 11 forms a spiral strip of several turns, so that the conductor track 10 also has the shape of a spiral, the outer end of which opens into a circle, and the inner end of which runs freely.
  • the second electrode 12 consists of an annular conductor track which is electrically connected via a conductor layer 13 covering the wall of the bore 9 to a contact electrode 14 which covers the underside of the carrier body 8.
  • the ignition bridge 15 extends radially between the inner end of the spiral-shaped first electrode 10 and the annular second electrode 12 and bridges the annular gap between these two electrodes.
  • the ignition resistor 15 is preferably produced using tantalum thin-film technology or applied as a thick-film resistor and is located on a carrier body 8 between the electrodes 10 and 12.
  • the outer ring of the electrode 10 is in surface contact with the bent end 3 of the ground contact ring 2, while the contact electrode 14 is in direct contact with the pole piece 7.
  • the spiral-shaped first electrode 10 forms an inductance, by means of which high-frequency signals are kept away from the ignition bridge 15. In contrast, the inductance does not influence the DC behavior of the ignition circuit.
  • the inductance does not necessarily have to be formed from a spiral conductor track, but it can also have a meandering course, for example.
  • the first electrode 10 is ring-shaped, with radial projections 16 pointing inwards from the ring.
  • the second electrode 12 has the shape of a round disk with radially outwardly pointing projections 17 which engage in the gaps between the projections 16 of the first electrode 10.
  • the two electrodes 10, 12 are separated from one another by a strip-shaped interruption 11 of constant width. As a result, the electrodes form a capacitance.
  • the ignition bridge 15 is located in a wider area between the electrodes 10, 12.
  • the capacitance formed by the electrodes is electrically connected in parallel with the ignition bridge 15 and thus acts as an interference suppression capacitor.
  • the second electrode 12 consists of a ring surrounding the bore 9, while the first electrode or conductor track 10 forms a parallel resonant circuit made of capacitors and inductors connected in parallel.
  • the first electrode 10 has two edge regions 18 lying opposite one another and a central region 19 surrounding the second electrode 12 at a distance.
  • the central region 19 protrudes into each of the edge regions 18, but is one of each of the edge regions meandering opening 11 of constant width separated. This results in regions 27, 28 in the conductor track, which lie opposite one another at a short distance and form the capacitors.
  • the inductors consist of loop-shaped regions 20 which have the shape of open circular rings, one end of which is connected to the edge regions 18 and the other ends of which are connected to the central region 19.
  • the circular opening between the central region 19 of the first electrode 10 and the second electrode 12 is bridged by the ignition bridge 15.
  • FIGS. 5 and 5a are not, as in the previous exemplary embodiments, stratified primers, but rather a squib, ie a wire primer.
  • the first electrode or conductor track 10 has a meandering opening 11 with the regions 29, 30 which are opposite one another at a short distance and form the capacitance.
  • an inductor Arranged parallel to the capacitance is an inductor, which consists of a section 25 in the form of an open conductor loop which runs through an otherwise conductor-free region 26 of the insulating material plate 21.
  • an LC filter is created, the electrical equivalent circuit of which consists of the parallel connection of an inductance and a capacitance which are in series with the ignition bridge 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Saccharide Compounds (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (6)

1. Elément d'allumage électrique avec un corps de support (8, 21) isolant électriquement, portant un pont d'allumage (15) et deux électrodes (10, 12) qui sont reliées au pont d'allumage (15) et dont l'une au moins est constituée par une piste conductrice en forme de couche, caractérisé en ce que la piste conductrice est réalisée comme filtre de haute fréquence.
2. Elément d'allumage électrique selon la revendication 1, caractérisé en ce que la piste conductrice est réalisée entierèment ou par portions comme résistance inductive de série, des zones différentes de la piste conductrice s'étendant à une distance sensiblement constante le long de chemins non linéaires.
3. Elément d'allumage électrique selon la revendication 1, caractérisé en ce que la piste conductrice est réalisée entierèment ou par portions comme inductance série, une zone (20, 25) de la piste conductrice formant une boucle ouverte.
4. Elément d'allumage électrique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la piste conductrice est réalisée comme circuit oscillant parallèle.
5. Elément d'allumage électrique selon la revendication 4, caractérisé en ce qu'une capacite est montée en parallèle avec l'inductance série (20 ou 25) par le fait que la piste conductrice (10) comportant l'inductance est réalisée, en dehors de la zone de l'inductance, géométriquement de telle facon qu'il se forme des zones (27, 28 ou 29, 30) de la piste conductrice (10) qui sont disposées à une faible distance (11) les unes des autres.
6. Elément d'allumage éléctrique selon la revendication 1, caractérisé en ce que la piste conductrice (10) forme avec une piste conductrice de l'autre électrode (12) une capacite en parallèle avec le pont d'allumage (15), les deux pistes conductrices s'étendant à faible distance sensiblement parallèlement l'une par rapport à l'autre.
EP85100750A 1984-01-31 1985-01-25 Allumeur électrique Expired EP0150823B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100750T ATE39758T1 (de) 1984-01-31 1985-01-25 Electrisches anzuendelement.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3403179 1984-01-31
DE3403179 1984-01-31

Publications (3)

Publication Number Publication Date
EP0150823A2 EP0150823A2 (fr) 1985-08-07
EP0150823A3 EP0150823A3 (en) 1986-07-23
EP0150823B1 true EP0150823B1 (fr) 1989-01-04

Family

ID=6226302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100750A Expired EP0150823B1 (fr) 1984-01-31 1985-01-25 Allumeur électrique

Country Status (5)

Country Link
US (1) US4690056A (fr)
EP (1) EP0150823B1 (fr)
AT (1) ATE39758T1 (fr)
CA (1) CA1254611A (fr)
DE (1) DE3567268D1 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL82508A (en) * 1987-05-13 1991-06-10 Israel Defence Electric igniter assembly
IL85527A (en) * 1988-02-24 1991-05-12 Israel Defence Electric igniter assembly
DE3812958A1 (de) * 1988-04-19 1989-11-02 Diehl Gmbh & Co Elektrisches anzuendmittel
US5029529A (en) * 1989-09-25 1991-07-09 Olin Corporation Semiconductor bridge (SCB) packaging system
US5113764A (en) * 1989-09-25 1992-05-19 Olin Corporation Semiconductor bridge (SCB) packaging system
EP0758735A3 (fr) * 1995-08-14 1998-01-07 ICI Americas Inc Initiateur pyrotechnique et procédé pour sa fabrication
US5847309A (en) * 1995-08-24 1998-12-08 Auburn University Radio frequency and electrostatic discharge insensitive electro-explosive devices having non-linear resistances
US6662727B2 (en) 1996-03-14 2003-12-16 Dynamit Nobel Gmbh Gas generator, in particular for belt tighteners
GB2315118A (en) * 1996-07-11 1998-01-21 Ici Plc Electro-explosvie device
FR2760525B1 (fr) * 1997-03-07 1999-04-16 Livbag Snc Initiateur electro-pyrotechnique constitue autour d'un circuit imprime complet
US6553911B1 (en) 1997-04-30 2003-04-29 Erico International Corporation Exothermic reactions and methods
US6105503A (en) * 1998-03-16 2000-08-22 Auburn University Electro-explosive device with shaped primary charge
WO2000017600A1 (fr) * 1998-09-22 2000-03-30 Eg & G, Inc. Detonateur a feuille explosee ameliore
FR2784176B1 (fr) 1998-10-06 2004-11-26 Livbag Snc Systeme d'initiation electro-pyrotechnique protege contre les decharges electrostatiques
FR2790078B1 (fr) 1999-02-18 2004-11-26 Livbag Snc Allumeur electropyrotechnique a securite d'allumage renforcee
US6772692B2 (en) * 2000-05-24 2004-08-10 Lifesparc, Inc. Electro-explosive device with laminate bridge
RU2302325C2 (ru) 2002-01-25 2007-07-10 Эрико Интэнэшнл Копэрейшн Автономный тигель и воспламенитель для сварочного аппарата
WO2015018828A1 (fr) * 2013-08-05 2015-02-12 Ruag Ammotec Gmbh Capsule d'allumage électrique pour munition de petit calibre
US9500448B1 (en) * 2015-06-09 2016-11-22 Reynolds Systems, Inc. Bursting switch

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA581316A (fr) * 1959-08-11 Canadian Industries Limited Capsules de mine avec pont de circuit imprime
US2818020A (en) * 1955-11-17 1957-12-31 Glenn A Burklund Safeguarded electric firing initiating devices
US3804018A (en) * 1970-06-04 1974-04-16 Ici America Inc Initiator and blasting cap
GB1419775A (en) * 1972-10-05 1975-12-31 Secr Defence Electrical initiators
DE2747163A1 (de) * 1977-10-20 1979-04-26 Dynamit Nobel Ag Elektrisches anzuendelement
CH643056A5 (de) * 1978-08-10 1984-05-15 Inventa Ag Elektrische zuendvorrichtung.
FR2513751B1 (fr) * 1981-09-28 1986-04-11 France Etat Initiateur pyrotechnique electrique a effet joule

Also Published As

Publication number Publication date
CA1254611A (fr) 1989-05-23
EP0150823A2 (fr) 1985-08-07
DE3567268D1 (en) 1989-02-09
EP0150823A3 (en) 1986-07-23
US4690056A (en) 1987-09-01
ATE39758T1 (de) 1989-01-15

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