EP0631104A1 - Elektropyrotechnischer Anzünder - Google Patents

Elektropyrotechnischer Anzünder Download PDF

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Publication number
EP0631104A1
EP0631104A1 EP94400953A EP94400953A EP0631104A1 EP 0631104 A1 EP0631104 A1 EP 0631104A1 EP 94400953 A EP94400953 A EP 94400953A EP 94400953 A EP94400953 A EP 94400953A EP 0631104 A1 EP0631104 A1 EP 0631104A1
Authority
EP
European Patent Office
Prior art keywords
resistive
pyrotechnic
initiator
explosive
flat strip
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.)
Granted
Application number
EP94400953A
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English (en)
French (fr)
Other versions
EP0631104B1 (de
Inventor
Jean-René Duguet
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.)
Livbag SAS
Original Assignee
NCS Pyrotechnie et Technologies SAS
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Filing date
Publication date
Application filed by NCS Pyrotechnie et Technologies SAS filed Critical NCS Pyrotechnie et Technologies SAS
Publication of EP0631104A1 publication Critical patent/EP0631104A1/de
Application granted granted Critical
Publication of EP0631104B1 publication Critical patent/EP0631104B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F42B3/12—Bridge initiators
    • F42B3/124—Bridge initiators characterised by the configuration or material of the bridge

Definitions

  • the present invention relates to an electro-pyrotechnic initiator comprising a pyrotechnic charge initiated by a resistive heating element placed in contact with this charge.
  • the invention also relates to a method for producing such an initiator.
  • a particularly advantageous application of the invention is in particular the ignition of the pyrotechnic chain of an “air-bag” type device, but may also relate to missiles or spacecraft and, in general, any electro-initiation system. pyrotechnic which requires great regularity of operation and very high reliability.
  • the resistive element is a cylindrical filament of small diameter, consisting of an alloy of high resistivity. This resistive filament is connected by welding at its two ends respectively to two current leads.
  • the initiators according to the known technique comprise a thermosensitive substance in close contact with the resistive element.
  • This substance is present either in the form of a pulverulent mass compacted by strong compression, or in the form of a match in the form of a so-called "pearl" obtained by a conventional soaking technique.
  • thermosensitive substance In a very short time after the start of the passage of the electric current through the resistive element, the rise by Joule effect of the temperature of said thermosensitive substance to the point of rapid self-decomposition thereof, causes its deflagration and this pyrotechnic reaction ignites a make-up powder or a reinforcing pyrotechnic composition in the case of an igniter; it initiates the detonation of a primary charge in the case of a detonator.
  • the initiators according to the prior techniques generally exhibit fairly dispersed performances in terms of sensitivity, operating time and intensity of the pyrotechnic output phenomenon.
  • their resistance to harsh environments, and in particular to shocks and vibrations encountered during the life of the product can cause problems.
  • Such an initiator is produced in a simple manner according to a technique for manufacturing printed circuits, well known to those skilled in the art. Its shape can be adapted to the desired characteristics and it is extremely precise and reproducible in large series.
  • the initiator according to the invention comprises large electrically conductive surfaces, connected on the one hand to the ends of the resistive element, and which on the other hand allow them to be easily connected to the current leads by conventional techniques well known to those skilled in the art, such as welding, soldering or crimping.
  • the electro-pyrochtechnic initiator is robust, insensitive to external aggressions and of extended service life. Its sensitivity characteristics are reliable and its short and regular operating times, which allows it to be applied, for example, to new generation Air-Bag igniters.
  • Figure 1 is a schematic side view in longitudinal section of a system comprising an initiator according to the invention.
  • Figure 2 is a partial schematic view from above of a printed circuit constituting the initiator according to the invention.
  • FIG. 3 is a schematic sectional view along the plane A-A of the printed circuit of FIG. 2.
  • FIG. 4 is a schematic sectional view along plane B-B of the printed circuit of FIG. 2.
  • an initiation system which comprises a cap 10, made of plastic or metallic material, in which is formed in the upper part a reservoir 11.
  • This reservoir 11 contains a reinforcing composition such as a composition ignition or a primary powder or explosive.
  • the cap 10 is arranged integrally on an electro-pyrotechnic head 100 so that said head 100 is placed just below the bottom of the reservoir 11 near the reinforcing composition.
  • This head 100 is intended to initiate the reinforcing composition placed in the reservoir 11.
  • the electro-pyrotechnic head 100 comprises a printed circuit support 101 placed inside the cap 10.
  • This printed circuit support 101 is here made of a composite plastic, such as for example an epoxy resin loaded with glass fibers.
  • the printed circuit support 101 has on its upper surface, disposed facing the bottom of the reservoir 11, a flat strip 110 formed by a resistive metal alloy and here having a parallelipiped shape.
  • this resistive flat strip this is for example carried out according to the conventional technique of etching of so-called "thin layer" printed circuits which consists in photoetching a sheet. thin of a resistive alloy such as nickel-chromium, bonded to the printed circuit support 101 and previously adequately masked according to a desired design.
  • the electro-pyrotechnic head 100 has two large current conducting surfaces 122 adjacent to the short sides of the flat strip 110 and whose dimensions are large with respect to the latter. These current-conducting surfaces 121, 122 are produced by photogravure so as to reveal two conductive pads adjacent to said flat strip 110 by covering the resistive alloy sheet previously engraved with a metal such as electrolytic copper which is optionally then protected. by a layer of tinning 124.
  • the electro-pyrotechnic head 100 here comprises pins for supplying current 102,103 in parallel, linked to the two extended conductive surfaces 121,122 and extending perpendicularly thereto. beyond the support 101 while crossing the latter.
  • the solid connection of pins 102,103 to the two large surfaces 121,122 is carried out using conventional techniques, well known to those skilled in the art, such as mechanical pressure, crimping, brazing or any other means of welding with or without filler metal.
  • These pins make it possible to bring the current to the resistive strip via the conductive surfaces, said resistive strip then heating it alone by Joule effect, at the time of the passage of the electric current.
  • the dimensions of the resistive strip 110 as well as those of the current supply surfaces 121, 122 have been determined experimentally by carrying out a large number of tests, so that the initiator has good characteristics of sensitivity and of operating time after the start of current flow.
  • the resistive strip 110 preferably has a width l of between approximately 80 and 300 micrometers, a length L of approximately between 0.3 and 3 millimeters and a rectangular section of thickness e of approximately between 1 and 15 micrometers.
  • the head 100 includes a thermosensitive substance 104 intended to be initiated by the resistive strip which heats by Joule effect.
  • This thermosensitive substance is in the form of a thin layer of an explosive lacquer, of low mass and less than 15% of the total mass of the pyrotechnic charge of the initiator: it is constituted by a primary explosive or a mixture heat-sensitive oxidizing-reducing agent added with 2 to 15% of a film-forming binder.
  • the explosive lacquer is produced by mixing said film-forming binder, previously dissolved in an appropriate solvent, with the explosive substances. This mixture is deposited, using conventional volumetric or weighting means, on the resistive flat strip 110 of the printed circuit constituting a part of the head of the initiator. Subsequently, the lacquer solvent is evaporated so as to form a thin, explosive hard layer which is perfectly adherent.
  • the nature of the explosive mixture applied in the form of a lacquer is defined so as to ensure both the hardness and the adhesion of the lacquer as well as the thermal sensitivity required for the head of the initiator. has a good probability of operation in a short time after the current has passed through the resistive element 110.
  • this mixture is defined so as to provide good setting in regime of the composition contained in the reservoir 11 of the cap 10, this composition being generally added with a view to reinforcing the pyrotechnic effect of ignition or detonation of the initiator.
  • the composition chosen is of the oxidizing-reducing type, it consists for example of a mixture of boron and potassium nitrate or of a mixture of titanium hydride and potassium perchlorate or an equivalent mixture.
  • a composition has proved easy to light using only a mass of explosive lacquer of the order of 5 to 10 mg.
  • the explosive lacquer has a mass chosen to allow the ignition of the reinforcing composition, at any temperature, without representing an excessive part of the total charge of the igniter, thus ensuring excellent regularity of the ignition power. Release.
  • the igniter thus obtained is covered with the cap, the reservoir of which contains 80 mg of a granulated ignition composition containing 24% of boron and 70% of potassium nitrate, the assembly then being optionally sealed against the ambient medium by all appropriate means.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Lighters Containing Fuel (AREA)
  • Finger-Pressure Massage (AREA)
  • Resistance Heating (AREA)
EP94400953A 1993-05-05 1994-05-03 Elektropyrotechnischer Anzünder Expired - Lifetime EP0631104B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9305370A FR2704944B1 (fr) 1993-05-05 1993-05-05 Initiateur électro-pyrotechnique.
FR9305370 1993-05-05

Publications (2)

Publication Number Publication Date
EP0631104A1 true EP0631104A1 (de) 1994-12-28
EP0631104B1 EP0631104B1 (de) 1998-09-09

Family

ID=9446791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400953A Expired - Lifetime EP0631104B1 (de) 1993-05-05 1994-05-03 Elektropyrotechnischer Anzünder

Country Status (5)

Country Link
US (1) US5544585A (de)
EP (1) EP0631104B1 (de)
AT (1) ATE170973T1 (de)
DE (1) DE69413135T2 (de)
FR (1) FR2704944B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5616881A (en) * 1995-05-30 1997-04-01 Morton International, Inc. Inflator socket pin collar for integrated circuit initaitor with integral metal oxide varistor for electro-static discharge protections
US5672841A (en) * 1995-12-15 1997-09-30 Morton International, Inc. Inflator initiator with zener diode electrostatic discharge protection
US5932832A (en) * 1996-04-15 1999-08-03 Autoliv Asp, Inc. High pressure resistant initiator with integral metal oxide varistor for electro-static discharge protection

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5847309A (en) * 1995-08-24 1998-12-08 Auburn University Radio frequency and electrostatic discharge insensitive electro-explosive devices having non-linear resistances
US5798476A (en) * 1996-03-25 1998-08-25 Trw Inc. Initiator for an air bag inflator
US5732634A (en) * 1996-09-03 1998-03-31 Teledyne Industries, Inc. Thin film bridge initiators and method of manufacture
FR2760525B1 (fr) 1997-03-07 1999-04-16 Livbag Snc Initiateur electro-pyrotechnique constitue autour d'un circuit imprime complet
US5939660A (en) * 1997-03-12 1999-08-17 Trw Inc. Inflator for an inflatable vehicle occupant protection device
FR2772909B1 (fr) 1997-12-22 2000-01-28 Livbag Snc Initiateur electro-pyrotechnique a trois connexions electriques
US6178888B1 (en) * 1998-01-20 2001-01-30 Eg&G Star City, Inc. Detonator
US20060086277A1 (en) * 1998-03-30 2006-04-27 George Bossarte Precision pyrotechnic display system and method having increased safety and timing accuracy
US6490977B1 (en) 1998-03-30 2002-12-10 Magicfire, Inc. Precision pyrotechnic display system and method having increased safety and timing accuracy
JP2971439B2 (ja) * 1998-04-21 1999-11-08 東芝ホクト電子株式会社 着火装置およびその製造方法
DE19836278C2 (de) * 1998-08-11 2000-07-20 Dynamit Nobel Ag Extern ansteuerbare Anzündeinheit mit integrierter Elektronik zum Auslösen eines Rückhaltesystems
US6209457B1 (en) 1998-08-13 2001-04-03 Technology Commercialization Corp. Method and preformed composition for controlled localized heating of a base material using an exothermic reaction
FR2784176B1 (fr) 1998-10-06 2004-11-26 Livbag Snc Systeme d'initiation electro-pyrotechnique protege contre les decharges electrostatiques
WO2000037395A1 (en) * 1998-12-21 2000-06-29 Smi Technology (Proprietary) Limited A detonation initiating device
FR2790078B1 (fr) 1999-02-18 2004-11-26 Livbag Snc Allumeur electropyrotechnique a securite d'allumage renforcee
FR2790077B1 (fr) 1999-02-18 2001-12-28 Livbag Snc Allumeur electro-pyrotechnique a electronique integree
US6363853B1 (en) * 1999-09-17 2002-04-02 Apti, Inc. Electrically initiated distributed igniter
FR2800865B1 (fr) * 1999-11-05 2001-12-07 Livbag Snc Initiateur pyrotechnique a filament photograve protege contre les decharges electrostatiques
US6324979B1 (en) * 1999-12-20 2001-12-04 Vishay Intertechnology, Inc. Electro-pyrotechnic initiator
FR2809806B1 (fr) * 2000-05-30 2003-01-10 Livbag Snc Initiateur electro-pyrotechnique a pont en couche mince et a tres basse energie de fonctionnement
WO2002057705A2 (en) 2001-01-22 2002-07-25 Smi Technology (Pty) Limited An initiating device for an electronic detonator
DE10116189A1 (de) * 2001-03-31 2002-10-10 Bosch Gmbh Robert Brückenzünder
FR2833693B1 (fr) 2001-12-14 2004-03-12 Livbag Snc Procede de realisation d'un initiateur electro-pyrotechnique par emploi d'une colle aqueuse
JP4527478B2 (ja) * 2004-09-10 2010-08-18 日本化薬株式会社 薄膜ブリッジを用いたイニシエータ
FR2882814A1 (fr) 2005-03-04 2006-09-08 Vishay Sa Sa Element resistif chauffant pour initiateur pyrotechnique
US8079307B2 (en) 2005-10-05 2011-12-20 Mckinley Paul Electric match assembly with isolated lift and burst function for a pyrotechnic device
JP4996481B2 (ja) * 2006-01-06 2012-08-08 日本化薬株式会社 点火装置ならびにエアバッグ用ガス発生装置およびシートベルトプリテンショナー用ガス発生装置
JP4813904B2 (ja) * 2006-01-06 2011-11-09 日本化薬株式会社 点火装置およびその製造方法ならびにエアバッグ用ガス発生装置およびシートベルトプリテンショナー用ガス発生装置
JP4705550B2 (ja) 2006-10-26 2011-06-22 日本化薬株式会社 スクイブならびにエアバッグ用ガス発生装置およびシートベルトプリテンショナー用ガス発生装置
JP4653718B2 (ja) * 2006-10-26 2011-03-16 日本化薬株式会社 スクイブならびにエアバッグ用ガス発生装置およびシートベルトプリテンショナー用ガス発生装置
US8547680B2 (en) * 2008-11-05 2013-10-01 Nipponkayaku Kabushikikaisha Ignition system, gas generating device for airbag, and gas generating device for seatbelt pretensioner
US8477049B2 (en) * 2009-06-05 2013-07-02 Apple Inc. Efficiently embedding information onto a keyboard membrane
CN102384486A (zh) * 2011-09-23 2012-03-21 中国电子科技集团公司第四十八研究所 一种低发火电压的Ni-Cr合金薄膜桥点火器及其制备方法
CN102927590A (zh) * 2012-10-26 2013-02-13 中国电子科技集团公司第四十八研究所 一种金属薄膜桥点火器及其制备方法
EP3339798B1 (de) 2013-12-19 2020-09-23 RUAG Ammotec GmbH Verfahren zur herstellung von elektrischen auslöseelementen für pyrotechnische gegenstände

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366055A (en) * 1966-11-15 1968-01-30 Green Mansions Inc Semiconductive explosive igniter
US3447416A (en) * 1967-09-01 1969-06-03 Us Army Electric initiator
FR2090579A5 (de) * 1970-04-24 1972-01-14 Dynamit Nobel Ag
US4040356A (en) * 1976-07-06 1977-08-09 The United States Of America As Represented By The Secretary Of The Army Converging wave detonator
US4729315A (en) * 1986-12-17 1988-03-08 Quantic Industries, Inc. Thin film bridge initiator and method therefor
US5029529A (en) * 1989-09-25 1991-07-09 Olin Corporation Semiconductor bridge (SCB) packaging system

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US3779167A (en) * 1970-01-21 1973-12-18 Olin Corp Electrical initiator
US3910188A (en) * 1974-04-04 1975-10-07 Us Army One watt/one amp no-fire match type initiator
US4312271A (en) * 1976-07-08 1982-01-26 Systems, Science And Software Delay detonator device
ZA867456B (en) * 1985-10-22 1987-05-27 Royal Ordnance Plc Explosive projectiles
GB8712789D0 (en) * 1986-06-25 1989-10-18 Secr Defence Pyrotechnic train
SE456939B (sv) * 1987-02-16 1988-11-14 Nitro Nobel Ab Spraengkapsel
DE3800455A1 (de) * 1988-01-09 1989-07-20 Dynamit Nobel Ag Zuendelement, vorzugsweise mit langer verzoegerungszeit
US4924774A (en) * 1989-05-16 1990-05-15 Trw Vehicle Safety Systems Inc. Apparatus for igniting a pyrotechnic transmission line
US5230287A (en) * 1991-04-16 1993-07-27 Thiokol Corporation Low cost hermetically sealed squib
DE4113319A1 (de) * 1991-04-24 1992-10-29 Dynamit Nobel Ag Bruecken-zuendmittel
US5140906A (en) * 1991-11-05 1992-08-25 Ici Americas, Inc. Airbag igniter having double glass seal
DE4236729A1 (de) * 1992-10-30 1994-05-05 Dynamit Nobel Ag Zünd- bzw. Anzündpille
JP3484517B2 (ja) * 1993-02-26 2004-01-06 エヌ・ケイ・エヌ・エム・リミテッド 改良された半導体ブリッジ起爆装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366055A (en) * 1966-11-15 1968-01-30 Green Mansions Inc Semiconductive explosive igniter
US3447416A (en) * 1967-09-01 1969-06-03 Us Army Electric initiator
FR2090579A5 (de) * 1970-04-24 1972-01-14 Dynamit Nobel Ag
US4040356A (en) * 1976-07-06 1977-08-09 The United States Of America As Represented By The Secretary Of The Army Converging wave detonator
US4729315A (en) * 1986-12-17 1988-03-08 Quantic Industries, Inc. Thin film bridge initiator and method therefor
US5029529A (en) * 1989-09-25 1991-07-09 Olin Corporation Semiconductor bridge (SCB) packaging system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5616881A (en) * 1995-05-30 1997-04-01 Morton International, Inc. Inflator socket pin collar for integrated circuit initaitor with integral metal oxide varistor for electro-static discharge protections
US5672841A (en) * 1995-12-15 1997-09-30 Morton International, Inc. Inflator initiator with zener diode electrostatic discharge protection
US5932832A (en) * 1996-04-15 1999-08-03 Autoliv Asp, Inc. High pressure resistant initiator with integral metal oxide varistor for electro-static discharge protection

Also Published As

Publication number Publication date
DE69413135T2 (de) 1999-05-12
US5544585A (en) 1996-08-13
FR2704944B1 (fr) 1995-08-04
ATE170973T1 (de) 1998-09-15
EP0631104B1 (de) 1998-09-09
DE69413135D1 (de) 1998-10-15
FR2704944A1 (fr) 1994-11-10

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