EP0076210B1 - Elektrische Brückenzünder für pyrotechnische Ladungen - Google Patents

Elektrische Brückenzünder für pyrotechnische Ladungen Download PDF

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Publication number
EP0076210B1
EP0076210B1 EP82401734A EP82401734A EP0076210B1 EP 0076210 B1 EP0076210 B1 EP 0076210B1 EP 82401734 A EP82401734 A EP 82401734A EP 82401734 A EP82401734 A EP 82401734A EP 0076210 B1 EP0076210 B1 EP 0076210B1
Authority
EP
European Patent Office
Prior art keywords
pyrotechnic
resistive
layer
electrodes
conductive
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
EP82401734A
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English (en)
French (fr)
Other versions
EP0076210A1 (de
Inventor
Joseph Refouvelet
Paul Baldy
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.)
Direction General de lArmement DGA
Original Assignee
Delegation Generale pour lArmement
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Application filed by Delegation Generale pour lArmement filed Critical Delegation Generale pour lArmement
Priority to AT82401734T priority Critical patent/ATE21450T1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen printing
    • 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

  • a pyrotechnic initiator also called a primer, is most generally composed, in addition to a metal cell serving as a casing for a so-called useful pyrotechnic composition based on primary explosive and an initiation device proper.
  • the present invention relates more particularly to electrical pyrotechnic initiators whose initiation device uses the Joule effect. Under the effect of an electric current called firing sent by an external device into a resistor, an amount of heat is released causing the explosive decomposition of the useful pyrotechnic charge in contact with the resistor.
  • the wire primers use as a heating element metallic wires resistant to contact in the useful pyrotechnic charge and welded at each end to electrodes.
  • these metallic wires do not have a high resistivity. Increasing the total resistance of the wire requires either an increase in length or a decrease in the diameter of the wire.
  • this simple resistance wire technology is suitable for low resistance initiators, this does not exceed 10 S2, and for small and medium series production.
  • the primers with conductive compositions do not have an independent heating element, but it is the pyrotechnic composition itself which is made conductive, in general by adding graphite and which conducts the electric current and is heated directly by the Joule effect.
  • the Joule effect electric pyrotechnic initiator described in patent BE-A-840 674 has a resistive element consisting of a thin metallic layer deposited under vacuum.
  • the resistance value remains low and imprecise, while this technique of depositing provided layers (layers of thickness less than 1 ⁇ m) does not allow the use of these primers under severe mechanical and thermal stresses.
  • the object of the present invention is to produce an electrical pyrotechnic initiator with an initiation device using the Joule effect, the electrical resistance of which can reach a value of the order of several tens or even hundreds of ohms.
  • Another object is to produce such an initiator which is simple to manufacture, low cost, has good mechanical strength and is well suited to mass production, having significantly improved safety and operating reliability compared to known primers. That is, the value of the resistance can be set precisely.
  • resistors for hybrid circuits in another technical sector relating to the technology for manufacturing resistors for hybrid circuits, the use of resistors in thick layers consisting in particular of conductive inks deposited in polymerized layers as described for example in the patents FR -A-2 305 478 or GB-A-1 565 207.
  • the conductive ink is used as an electrical resistance proper, designated under the general term of resistance in thick layer.
  • These inks can be used by screen printing.
  • the subject of the invention is therefore an electrical pyrotechnic initiator, of the type comprising a resistive conductive layer connected to two electrodes and placed in contact with a pyrotechnic charge to initiate the latter by Joule heating, an initiator characterized in that the layer resistive conductive is a thick layer consisting of a screen-printed resistive ink of the type comprising a mixture of glass or ceramic beads and metals and metal oxides.
  • the pyrotechnic initiator is characterized in that the resistive ink layer is deposited by screen printing on a washer-shaped substrate placed under the pyrotechnic charge, so that it is in contact with the charge and with two electrodes consisting of two annular metallization layers concentric with the washer and provided thereon.
  • the primer thus produced turns out to be a simple design with good mechanical resistance and easy mass production.
  • the conductive ink layer is in fact deposited by screen printing on the support, then baked in the oven and finally covered by a passivation layer.
  • the primer according to the invention comprises an outer metal casing 1, which can be for example of brass, substantially cylindrical containing the useful pyrotechnic charge 2 of the primer in its upper part.
  • the load 2 is separated from the envelope 1 by a cup 3, also made of brass, the bottom of which is provided with a central opening 4.
  • a protective nitrafilm 5 which compresses this load 2 towards the ink layer conductive 6. This is in fact in contact with the payload 2 through the central opening 4 at the bottom of the cup 3.
  • the conductive layer 6 is deposited on a ceramic support 7 in the form of a washer deposited under the cup 3.
  • the useful pyrotechnic charge of the primer can consist, for example, of a pyrotechnic composition based on mercury fulminate, lead trinitroresorcinate or lead azide.
  • Figure 2 are shown the metallization layers 8 and 9 deposited on the substrate 7 of ceramic or other material on and between which is deposited the layer of conductive ink 6.
  • the conductive ink is advantageously deposited by screen printing on the substrate 7 then the whole is baked in the oven and then receives a passivation layer, in this case a protective varnish to prevent oxidation.
  • the deposition technique (screen printing and firing), the conductive ink composed in particular of mixtures of glass or ceramic beads and metals and metal oxides, as well as the substrate (ceramic) are those used for hybrid circuits.
  • the shapes and dimensions of the elements are adapted to the particular constraints of the initiators, in particular to the electrode system.
  • a crimpable stud 10 which is separated from the outer casing 1 by an insulating cup 11.
  • the stud emerges in contact on the one hand with the pyrotechnic charge 2 by the central vacuum of the washer 7 and on the other hand overflows on the annular layer 9.
  • the bottom of the cup 3 rests on the metallization layer 8.
  • the annular layers 8 and 9 constitute electrodes when an electrical potential is applied between the pad 10 and the cup 3.
  • a voltage source is connected between the pad 10 and the cup 3 therefore between the two electrodes 8 and 9 the current crosses the screen-printed resistor 6 and causes it to heat up by the Joule effect.
  • the heat is transmitted by thermal conductor in the pyrotechnic composition 2 and causes its initiation.
  • the particular primer described is intended for igniting the propellant charge of a medium caliber ammunition.
  • This type of primer can also be used for large-caliber primer-carrying tubes, electric debonators for shell rockets or igniters for missiles and rockets.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Conductive Materials (AREA)
  • Materials For Medical Uses (AREA)
  • Resistance Heating (AREA)

Claims (2)

1. - Elektrische, pyrotechnische Zündkapsel mit einer Widerstandsschicht, die an zwei Elektroden angeschlossen ist und mit einer pyrotechnischen Ladung (2) in Kontakt steht, um diese durch Widerstandsheizung zu zünden, dadurch gekennzeichnet, dass die Widerstandsschicht von einer dicken, durch Siebdruck aufbringbaren Widerstandsfarbschicht (6) gebildet wird, die eine Mischung aus Glas- oder Keramikkugeln sowie Metallen und Metalloxyden umfasst.
2. - Elektrische, pyrotechnische Zündkapsel nach Anspruch 1, dadurch gekennzeichnet, dass die Widerstandsfarbschicht (6) durch Siebdruck auf eine Keramikunterlage (7) in Form einer unter der pyrotechnischen Ladung (2) angeordneten Scheibe derart aufgebracht wird, dass die Farbe einen Bereich zwischen zwei von konzentrisch zur Scheibe angeordneten, ringförmigen Metallschichten (8, 9) gebildeten Elektroden einnimmt, die auf der vorstehend genannten Scheibe vorgesehen sind, und mit den Elektroden in Kontakt steht.
EP82401734A 1981-09-28 1982-09-27 Elektrische Brückenzünder für pyrotechnische Ladungen Expired EP0076210B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401734T ATE21450T1 (de) 1981-09-28 1982-09-27 Elektrische brueckenzuender fuer pyrotechnische ladungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8118191 1981-09-28
FR8118191A FR2513751B1 (fr) 1981-09-28 1981-09-28 Initiateur pyrotechnique electrique a effet joule

Publications (2)

Publication Number Publication Date
EP0076210A1 EP0076210A1 (de) 1983-04-06
EP0076210B1 true EP0076210B1 (de) 1986-08-13

Family

ID=9262510

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401734A Expired EP0076210B1 (de) 1981-09-28 1982-09-27 Elektrische Brückenzünder für pyrotechnische Ladungen

Country Status (4)

Country Link
EP (1) EP0076210B1 (de)
AT (1) ATE21450T1 (de)
DE (1) DE3272594D1 (de)
FR (1) FR2513751B1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0143071A1 (de) * 1983-11-18 1985-05-29 Fela E. Uhlmann Aktiengesellschaft für gedruckte Schaltungen Verfahren zur Herstellung einer elektrischen Zündvorrichtung, danach hergestellte Zündvorrichtung und deren Verwendung
ATE39758T1 (de) * 1984-01-31 1989-01-15 Dynamit Nobel Ag Electrisches anzuendelement.
FR2698687B1 (fr) * 1992-12-01 1995-02-03 Giat Ind Sa Initiateur pyrotechnique.
EP0717259A1 (de) * 1994-12-14 1996-06-19 Altech Industries (Pty) Limited Detonatoren
RU2147365C1 (ru) * 1998-06-15 2000-04-10 Новосибирский механический завод "Искра" Детонирующее устройство
FR2827377B1 (fr) * 2001-07-13 2003-12-05 Poudres & Explosifs Ste Nale Dispositif d'allumage pour microcharges pyrotechniques
EP1418121A1 (de) * 2002-11-06 2004-05-12 Eaton Fluid Power GmbH Türbetätigungssystem für Notfälle
DE102007017679A1 (de) * 2007-01-11 2008-07-17 Rheinmetall Waffe Munition Gmbh Anzündmittel
RU2477450C1 (ru) * 2011-08-19 2013-03-10 Открытое акционерное общество Новосибирский механический завод "Искра" Устройство модуля программируемой цифровой задержки системы неэлектрического взрывания и способ его применения

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2305478A1 (fr) * 1975-03-25 1976-10-22 Labo Electronique Physique Pate serigraphiable pour conducteurs en couches epaisses a deposer sur un substrat ceramique et procede de preparation de couches conductrices utilisant une telle pate
GB1565207A (en) * 1975-09-05 1980-04-16 Sinclair Radionics Printed circuits
FR2436963A1 (fr) * 1978-09-19 1980-04-18 France Etat Amorce electrique a composition conductrice

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333538A (en) * 1966-06-09 1967-08-01 Hercules Inc Electric initiator structure
US3426682A (en) * 1967-04-27 1969-02-11 Sidney A Corren Exploding fuse
DE2020016C3 (de) * 1970-04-24 1974-12-12 Dynamit Nobel Ag, 5210 Troisdorf Metallschichtzündmittel
BE840674A (fr) * 1976-04-13 1976-10-13 Amorce pour mise a feu electrique de charges propulsives, explosives et similaires
GB2049651B (en) * 1979-04-30 1982-12-01 Brock Fireworks Coating surfaces with explosive or pyrotechniccompositions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2305478A1 (fr) * 1975-03-25 1976-10-22 Labo Electronique Physique Pate serigraphiable pour conducteurs en couches epaisses a deposer sur un substrat ceramique et procede de preparation de couches conductrices utilisant une telle pate
GB1565207A (en) * 1975-09-05 1980-04-16 Sinclair Radionics Printed circuits
FR2436963A1 (fr) * 1978-09-19 1980-04-18 France Etat Amorce electrique a composition conductrice

Also Published As

Publication number Publication date
FR2513751B1 (fr) 1986-04-11
DE3272594D1 (en) 1986-09-18
EP0076210A1 (de) 1983-04-06
FR2513751A1 (fr) 1983-04-01
ATE21450T1 (de) 1986-08-15

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