EP0711400B1 - Pyrotechnischer anzünder - Google Patents

Pyrotechnischer anzünder Download PDF

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Publication number
EP0711400B1
EP0711400B1 EP95921861A EP95921861A EP0711400B1 EP 0711400 B1 EP0711400 B1 EP 0711400B1 EP 95921861 A EP95921861 A EP 95921861A EP 95921861 A EP95921861 A EP 95921861A EP 0711400 B1 EP0711400 B1 EP 0711400B1
Authority
EP
European Patent Office
Prior art keywords
pyrotechnic
endplate
substance
casing
electrodes
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 - Lifetime
Application number
EP95921861A
Other languages
English (en)
French (fr)
Other versions
EP0711400A1 (de
Inventor
Joseph Refouvelet
Hervé Lebreton
Jean-Claude Bernardy
Yves Castel
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.)
Giat Industries SA
Original Assignee
Giat Industries SA
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 Giat Industries SA filed Critical Giat Industries SA
Publication of EP0711400A1 publication Critical patent/EP0711400A1/de
Application granted granted Critical
Publication of EP0711400B1 publication Critical patent/EP0711400B1/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
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • 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
    • F42B3/13—Bridge initiators with semiconductive bridge

Definitions

  • the field of the present invention is that of pyrotechnic initiators, i.e. components allowing to transmit a pyrotechnic effect in a pyrotechnic chain.
  • the invention thus aims to propose an initiator which is both extremely reliable and robust, everything being very resistant to electrostatic discharges.
  • the invention finally proposes an initiator presenting a very high level of security, capable of initiating primary explosives but also allowing to set works with insensitive pyrotechnic compositions.
  • the subject of the invention is an initiator pyrotechnic comprising a pyrotechnic substance arranged inside a housing, and characterized in that the housing includes an integral metal wall an equally metallic bottom, the bottom being crossed by at least two electrodes, at least one of which is isolated electrically from the bottom by an insulating material, and in this that the housing has an overmolding in a material plastic surrounding at least the bottom and part of the electrodes.
  • the housing is closed by a paillet on which is folded the edge of the metal wall.
  • a seal will then be placed between the paillet and the closing edge of the wall.
  • the overmolding also surrounds the metal wall and door a plastic plug which closes the housing.
  • the bottom may carry a pellet of a substrate insulation on which a semiconductor bridge will be deposited partially covered by two conductive pads.
  • one of the studs conductors is connected to the metal bottom of the case by via a semiconductor well crossing the substrate, said bottom itself being connected to one of the electrodes.
  • a layer of thermal and electrical insulating material is deposited on the semiconductor bridge and isolates it from the substance pyrotechnic.
  • the insulating material will preferably be made with silicon oxide or nitride deposited in a thin layer between 0.5 and 10 micrometers.
  • the pyrotechnic substance is deposited in the case by a loading process by wet.
  • the average particle size of the constituents of the pyrotechnic substance will preferably be chosen from the same order of magnitude as the dimensions of the semi bridge driver.
  • an initiator 1 comprises a pyrotechnic substance 2 of known type, (e.g. an explosive (detonator) or a inflammatory pyrotechnic composition), substance placed in a housing 3.
  • a pyrotechnic substance 2 of known type, (e.g. an explosive (detonator) or a inflammatory pyrotechnic composition)
  • substance placed in a housing 3 e.g. an explosive (detonator) or a inflammatory pyrotechnic composition
  • the housing 3 comprises a metal wall 4 cylindrical secured to a base 5 also metallic.
  • Wall and bottom are made of stainless steel.
  • the bottom here assumes the shape of a cap whose upper face 6 receives the pyrotechnic substance 2 and which has an enlarged flange 7 on which comes in wall 4.
  • Bottom and wall are connected to each other by electric welding, laser welding or another type of welding.
  • the bottom 5 is crossed by two electrodes 8a, 8b one of which (8a) is in electrical contact with the bottom 5 and the other (8b) is electrically isolated from it by means of an insulating material 15 such as a glass filling.
  • a means of initiation of the pyrotechnic substance is fixed between the electrodes.
  • This means here is a thread resistive 9 which connects the electrodes 8a and 8b and which is fixed by welding on their ends.
  • the electrical characteristics of wire 9 are conventionally determined by those skilled in the art in function of the pyrotechnic characteristics of the substance 2.
  • the housing 3 finally comprises a molding 10 in one plastic material which surrounds the bottom 5 and part of the electrodes 8a, 8b.
  • the rigidity of the connection is improved by the presence of the collar 7.
  • This overmolding improves resistance mechanics of the component, in particular with regard to impacts. It also completes the electrical insulation of the electrodes and protects the glass filling 15.
  • Overmolding 10 is made of plastic Polyamide or polycarbonate type, possibly a material filled with glass fibers to increase its resistance mechanical.
  • the overmolding 10 includes a bulge 11 which gives a support surface allowing for example its setting in place in a housing furnished in a substance pyrotechnic or in a non initiation device shown (housing to the diameter of the housing).
  • the wall 4 of the housing is closed by a paillet 12 on which the edge 13 of the metal wall is folded.
  • An O-ring seal 14 is disposed between the straw 12 and the edge 13 for closing the wall.
  • Pyrotechnic substance 2 is deposited at the interior of the housing 3, preferably by a method of wet loading but it could also be put in place by compression.
  • the initiator according to the invention can be manufactured easily and at low cost, manufacturing requiring few operations and each operation being simple and easily automated.
  • the bottom carrying the electrodes and the material insulator constitutes a subset which is produced so standard in large quantities in the electronics industry for the manufacture of components such as transistors or thyristors. Such a component is very inexpensive.
  • Plastic overmolding also makes it possible to obtain the shape that ensures the possibility of mounting the component in the desired application. Such overmolding is little expensive.
  • the filament is welded to the electrodes by means of soldering techniques suitable for wiring circuits integrated, inexpensive techniques and allowing high production rates.
  • the substance is put in place by compression directly in the housing of the housing and on the filament.
  • the metal wall and bottom also provide to the initiator excellent mechanical rigidity and allow, by forming a Faraday cage, to give the initiator significant resistance to discharges electrostatic while protecting it from induced currents by the electromagnetic environment.
  • resistive wire 9 it would be possible as a variant to replace the resistive wire 9 by a semiconductor wafer, printed circuit or integrated circuit, which may itself be glued to the bottom 5.
  • the pyrotechnic substance 2 is preferably deposited according to the known method of loading by channel wet.
  • This substance will be mixed at 1 to 5% by mass a binder such as natural gum or a synthetic binder and with water (5 to 30% by mass).
  • the substance is thus shaped into pellets the diameter of the case with appropriate tools.
  • a punch provides moderate compression (20 to 40 megapascals) of this pellet which allows the substance pyrotechnic to completely fill the housing 3 and to be in intimate contact with the filament 9.
  • Compression also drives out water to the top of the stuff.
  • the initiators charged then pass through a hot tunnel (50 to 80 ° C) which causes water to evaporate.
  • the drying of the substance has the effect of restoring its sensitivity.
  • Figure 2 shows another embodiment of the invention in which the bottom 5 has the shape of a plate carrying a peripheral flange 7 on which the metal wall 4 is positioned.
  • Wall and bottom are still made of steel stainless and are welded by electric arc.
  • the electrode 8b is welded into a blind hole in the bottom 5 while the electrode 8a crosses the bottom. She is electrically isolated from the bottom by a glass ring 15.
  • the overmolding in plastic material 10 surrounds the bottom, part of the electrodes and also the metal wall 4 on substantially its entire height.
  • the rigidity of the solidarity is improved by the presence of the flange 7.
  • the housing 3 is closed by a plug 16 made in the same plastic as that of the overmolding 10.
  • the plug 16 has a central part cylindrical 17, of the same diameter as the metal wall 4, and whose front face 18 is supported on the substance pyrotechnics 2.
  • the periphery of the plug 16 has a profile conical 16a which comes into contact with a profile complementary fitted on the overmolding 10.
  • the profile conical 16a is separated from the central part 17 by a annular groove 19.
  • This game allows a slight compression of the pyrotechnic substance during assembly for example by ultrasonic welding.
  • the plug is welded after water evaporation as described above.
  • the ultrasonic welding is carried out in a way known by applying a sonotrode from a welding machine on a circular crown of the outer flat face of the cap, crown located substantially to the right of the profile conical 16a (mark S).
  • the vibrations of the sonotrode cause the welding of contact surfaces, i.e. surfaces conical.
  • the plug 16 also includes a blind hole 20, realized on its external face, and which thus forms on the plug an area of reduced thickness or partition 21.
  • the pressure generated by the pyrotechnic substance 2 breaks the area of reduced thickness 21 and the initiator then transmits a pyrotechnic effect in an axial direction.
  • the presence of the metal wall and bottom also provide protection from electromagnetic influences and static electricity.
  • Figure 3 is a partial representation and enlarged means of initiation used in this second embodiment.
  • the initiation means consists of a wafer 22 of a non-silicon insulating substrate doped, on which is deposited a semiconductor bridge 23 (formed from doped silicon) and partially covered by two conductive pads 24a and 24b (for example in aluminum).
  • the spacing between the studs is between 60 and 100 micrometers and preferably of the order of 80 micrometers. We will determine in a known way the characteristics of the initiator by modifying the spacing of the studs, the dimensions of the semiconductor bridge and its doping.
  • the stud 24a is connected to the electrode 8a by a wire 25 fixed by welding.
  • the pad 24b is connected to the electrode 8b by through the metal bottom 5 through a well semiconductor 26 (doped silicon) which crosses the insulating substrate.
  • connection wire breaks one wire used instead two
  • a pyrotechnic substance will be adopted composition with an average particle size of the same order larger than the dimensions of the semiconductor bridge.
  • Such a means of initiation also allows obtain a high concentration of energy in an area (the semiconductor bridge) of reduced surface.
  • This technology thus allows the use of less sensitive pyrotechnic substances such as boron-based compositions (20% by mass) and nitrate potassium (80% by mass) or aluminum compositions (20% by mass) / copper oxide (80% by mass).
  • the pyrotechnic substance will preferably be wet loaded according to the process described previously. This type of loading ensures the reproducibility of the contact between the semiconductor bridge and substance and also helps to get with precision the desired mass of pyrotechnic substance.
  • Compression of the substance in the housing of the housing will then be carried out under higher pressure (for example of the order of 100 to 200 megapascals).
  • the cap 12 will be as previously supported against the pyrotechnic substance when it is fixed by welding on the skirt.
  • thermal insulating material and electric on the semiconductor bridge could be for example a layer of 0.5 to 10 micrometers thickness of silicon oxide or silicon nitride.
  • Such an insulating layer makes it possible to reduce strongly heat transfer between the semiconductor bridge and the pyrotechnic substance. This last therefore cannot be initiated or degraded when a low current flows (of the order of 0.3 amperes).
  • a strong current greater than 0.8 Amps
  • the insulating layer is crossed by projections of high pressure and high temperature silicon plasma and it can initiate explosives or substances insensitive pyrotechnics (for example a composition combining Boron and potassium nitrate).
  • a patch 22 comprising logic circuits that control switches integrated (based on transistors or thyristors) which can block the passage or current in the semiconductor bridge 23.
  • the initiator can only be initiated in response to a determined coded signal transmitted in superposition to the power signal supplied by the electrodes (or transmitted by specific complementary electrodes crossing the bottom 5).

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Lighters Containing Fuel (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

Claims (9)

  1. Pyrotechnischer Zünder (1) mit einer pyrotechnischen Substanz (2) im Inneren eines Gehäuses (3), das eine Metallwand (4) umfaßt, die fest mit dem ebenfalls metallischen Boden (5) fest verbunden ist, der von mindestens zwei Elektroden (8a, 8b) durchquert wird, von welchen mindestens eine elektrisch gegen den Boden (5) durch einen Isolationsstoff (15) isoliert ist, wobei der Zünder dadurch gekennzeichnet ist, daß das Gehäuse eine angeformte Beschichtung (10) um den Boden (5), einen Teil der Elektroden (8a, 8b) und die Metallwand (4) umfaßt, wobei das Gehäuse einen Stopfen (16) aus Kunststoff besitzt, der das Gehäuse verschließt und mit seiner Stirnfläche (18) auf der pyrotechnischen Substanz aufliegt.
  2. Zünder gemäß dem Anspruch 1, gekennzeichnet dadurch, daß der Boden (5) eine Schicht (22) aus einem isolierenden Substrat trägt, auf der eine Halbleiterbrücke (23) angebracht ist, die teilweise durch zwei leitende Klötzchen (24a, 24b) abgedeckt ist.
  3. Zünder gemäß dem Anspruch 2, gekennzeichnet dadurch, daß eines der leitenden Klötzchen (24b) mit dem metallischen Boden (5) des Gehäuses (3) mit einer Halbleitersenke (26) verbunden ist, die das Substrat durchquert, wobei besagter Boden (5) selbst an eine der Elektroden (8b) angeschlossen ist.
  4. Zünder gemäß einem der Ansprüche 2 oder 3, gekennzeichnet dadurch, daß eine Schicht Wärme- und Elektrizitätsisolation auf der Halbleiterbrücke aufgebracht ist und diese von der pyrotechnischen Substanz trennt.
  5. Zünder gemäß dem Anspruch 4, gekennzeichnet dadurch, daß das Isolationsmaterial aus Silizumoxid oder - nitrid besteht, das als dünner Film mit einer Stärke von 0,5 bis 10 Mikrometer aufgebracht wird.
  6. Zünder gemäß einem der Ansprüche 1 bis 5, gekennzeichnet dadurch, daß die pyrotechnische Substanz (2) in das Gehäuse anhand eines Naßverfahrens eingebracht wird.
  7. Zünder gemäß dem Anspruch 6, gekennzeichnet dadurch, daß die mittlere Korngröße der Bestandteile der pyrotechnischen Substanz in der gleichen Größenordnung liegt wie die Maße der Halbleiterbrücke.
  8. Zünder gemäß einem der Ansprüche 1 bis 7, gekennzeichnet dadurch, daß die pyrotechnische Substanz aus einem Gemisch auf Bor- und Kaliumnitratbasis besteht.
  9. Zünder gemäß einem der Ansprüche 1 bis 7, gekennzeichnet dadurch, daß die pyrotechnische Substanz ein Gemisch auf Aluminium- und Kupferoxidbasis ist.
EP95921861A 1994-05-31 1995-05-30 Pyrotechnischer anzünder Expired - Lifetime EP0711400B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9406605 1994-05-31
FR9406605A FR2720493B1 (fr) 1994-05-31 1994-05-31 Initiateur pyrotechnique.
PCT/FR1995/000702 WO1995033175A1 (fr) 1994-05-31 1995-05-30 Initiateur pyrotechnique

Publications (2)

Publication Number Publication Date
EP0711400A1 EP0711400A1 (de) 1996-05-15
EP0711400B1 true EP0711400B1 (de) 1998-11-25

Family

ID=9463690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95921861A Expired - Lifetime EP0711400B1 (de) 1994-05-31 1995-05-30 Pyrotechnischer anzünder

Country Status (9)

Country Link
US (1) US5576509A (de)
EP (1) EP0711400B1 (de)
JP (1) JPH09506965A (de)
KR (1) KR960704210A (de)
AT (1) ATE173813T1 (de)
CZ (1) CZ286099B6 (de)
DE (1) DE69506213T2 (de)
FR (1) FR2720493B1 (de)
WO (1) WO1995033175A1 (de)

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DE10018411B4 (de) * 2000-04-13 2005-07-21 Conti Temic Microelectronic Gmbh Zündvorrichtung für pyrotechnische Gasgeneratoren

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10018411B4 (de) * 2000-04-13 2005-07-21 Conti Temic Microelectronic Gmbh Zündvorrichtung für pyrotechnische Gasgeneratoren

Also Published As

Publication number Publication date
CZ340395A3 (en) 1997-04-16
DE69506213T2 (de) 1999-04-29
DE69506213D1 (de) 1999-01-07
EP0711400A1 (de) 1996-05-15
KR960704210A (ko) 1996-08-31
FR2720493B1 (fr) 1996-07-19
CZ286099B6 (cs) 2000-01-12
FR2720493A1 (fr) 1995-12-01
JPH09506965A (ja) 1997-07-08
ATE173813T1 (de) 1998-12-15
WO1995033175A1 (fr) 1995-12-07
US5576509A (en) 1996-11-19

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