EP1275931B1 - Anzündvorrichtung für kleine Treibladungen - Google Patents

Anzündvorrichtung für kleine Treibladungen Download PDF

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Publication number
EP1275931B1
EP1275931B1 EP02291677A EP02291677A EP1275931B1 EP 1275931 B1 EP1275931 B1 EP 1275931B1 EP 02291677 A EP02291677 A EP 02291677A EP 02291677 A EP02291677 A EP 02291677A EP 1275931 B1 EP1275931 B1 EP 1275931B1
Authority
EP
European Patent Office
Prior art keywords
pyrotechnic charge
ignition device
ink
charge
pyrotechnic
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
EP02291677A
Other languages
English (en)
French (fr)
Other versions
EP1275931A1 (de
Inventor
Denis Roller
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.)
Safran Ceramics SA
Original Assignee
SNPE Materiaux Energetiques 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 SNPE Materiaux Energetiques SA filed Critical SNPE Materiaux Energetiques SA
Publication of EP1275931A1 publication Critical patent/EP1275931A1/de
Application granted granted Critical
Publication of EP1275931B1 publication Critical patent/EP1275931B1/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
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/12—Primers; Detonators electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/085—Primers for caseless ammunition

Definitions

  • the technical field of the invention is that of pyrotechnic charge ignition devices, and more especially those involving a heating device.
  • the ignition devices according to the invention are particularly suitable for small pyrotechnic charges such as, for example, those which are involved in microvalves or micropumps and which are described in patent FR 2 774 684. These small pyrotechnic charges can also be found in other areas of application such as micro-propulsion for positioning satellites, fuel cells, or micro-heaters.
  • the pyrotechnic charge ignition devices comprising a heating device already exist and have been the subject of numerous patents.
  • One of the most commonly used is the device involving a conventional heating resistive element, such as a hot wire powered by an electric current.
  • a conductive fluid directly on the pyrotechnic charge.
  • Conductive fluid means materials such as conductive ink, paint or varnish.
  • the ignition device according to the invention remains effective at low energy, without causing particular damage to parts or walls constituting the immediate environment of the load.
  • the object of the present invention relates to a device for igniting a solid pyrotechnic charge, comprising a conductive track consisting of a conductive fluid deposited at least partially on the pyrotechnic charge, so that the ignition device is closely related to the pyrotechnic charge and remains completely independent of the immediate environment of said charge.
  • the application contemplates a device according to the features of claim 1.
  • the conductive fluid is deposited by screen printing.
  • the conductive fluid is a conductive ink and the conductive track is made by jet of said ink.
  • the pyrotechnic charge is deposited on a solid support and the conductive track is in contact only with said charge.
  • the support comprises a cavity and the pyrotechnic charge, which is in the form of a film, covers said cavity.
  • the pyrotechnic charge is based on nitrocellulose.
  • the cavity constitutes a free space between the pyrotechnic charge and the support, further reducing any conductive heat exchange between these two elements.
  • This configuration is particularly adapted to objects of very small size not exceeding a few millimeters, since at these orders of magnitude, the pyrotechnic charge may be deposited on the cavity in the form of a drop which will spread out thanks to the film forming capacity of said charge.
  • the invention also relates to a method for producing a device for igniting a pyrotechnic charge, characterized in that the deposition of the conductive fluid is carried out directly on the pyrotechnic charge.
  • the deposit is made by screen printing.
  • the conductive fluid is a conductive ink and the deposit is made by jet of said ink.
  • the ignition devices according to the invention have the advantage of being able to be manufactured in large series thanks to their great simplicity of implementation. In addition, they grant a great flexibility of use depending on the characteristics of the pyrotechnic charge, whether in terms of its composition or its geometry. Indeed, depending on the texture of the load, the conductive fluid may be thicker or thicker and depending on the type of ignition desired, the conductive track may take a particular shape and be more or less spread. Finally, the pyrotechnic charge and the conductive track form a monobloc and autonomous assembly, which can be integrated as is in a pre-existing microcircuit.
  • FIG. 1 is a sectional view of an ignition device according to the invention for a support presenting a cavity.
  • FIG. 2 is a view from above of the ignition device of FIG. 1.
  • the pyrotechnic charge 1 which contains nitrocellulose is deposited on a cylindrical cavity 4 of 1.5mm in diameter, hollowed in a support 3 of polycarbonate.
  • the charge 1 is found in the form of a discoid film whose thickness of 5 .mu.m could be between 1 and 100 .mu.m.
  • the conductive track 2 results from the deposition of an ink jet conductive ink directly on the load 1 and, ideally, said load 1 which completely covers the cavity 4, is inserted between the support 3 and said track 2.
  • the track conductive 2 has the shape of a thin strip of a few microns thick, passing through the load 1 according to one of its diameters. Such a configuration makes it possible to minimize thermal losses by conduction through the support 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Ink Jet (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Air Bags (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (9)

  1. Zündvorrichtung für eine feste pyrotechnische Ladung (1), die eine Leiterbahn (2) umfasst, welche aus einer leitenden Flüssigkeit besteht, welche zumindest teilweise auf der pyrotechnischen Ladung (1) abgeschieden ist, dadurch gekennzeichnet, dass die pyrotechnische Ladung (1) auf einem festen Träger (3) sitzt und eine Vertiefung (4) des Trägers (3) überdeckt.
  2. Zündvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die leitende Flüssigkeit mittels Siebdrucks aufgetragen ist.
  3. Zündvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die leitende Flüssigkeit eine leitende Tinte ist und die Leiterbahn (2) aus einem Strahl der Tinte besteht.
  4. Zündvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Leiterbahn (2) nur mit der pyrotechnischen Ladung (1) in Kontakt steht.
  5. Zündvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die pyrotechnische Ladung (1) in Form einer dünnen Schicht vorliegt.
  6. Zündvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die pyrotechnische Ladung (1) auf Basis von Nitrocellulose aufgebaut ist.
  7. Verfahren zur Herstellung einer Zündvorrichtung für eine pyrotechnische Ladung gemäß Anspruch 1, dadurch gekennzeichnet, dass das Auftragen der leitenden Flüssigkeit direkt auf die pyrotechnische Ladung erfolgt.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das Auftragen mittels Siebdrucks erfolgt.
  9. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die leitende Flüssigkeit eine leitfähige Tinte ist und das Auftragen mit einem Strahl dieser Tinte erfolgt.
EP02291677A 2001-07-13 2002-07-05 Anzündvorrichtung für kleine Treibladungen Expired - Lifetime EP1275931B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0109376A FR2827377B1 (fr) 2001-07-13 2001-07-13 Dispositif d'allumage pour microcharges pyrotechniques
FR0109376 2001-07-13

Publications (2)

Publication Number Publication Date
EP1275931A1 EP1275931A1 (de) 2003-01-15
EP1275931B1 true EP1275931B1 (de) 2006-07-05

Family

ID=8865486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02291677A Expired - Lifetime EP1275931B1 (de) 2001-07-13 2002-07-05 Anzündvorrichtung für kleine Treibladungen

Country Status (7)

Country Link
US (1) US6666140B2 (de)
EP (1) EP1275931B1 (de)
JP (1) JP3679386B2 (de)
AT (1) ATE332486T1 (de)
DE (1) DE60212905T2 (de)
ES (1) ES2266424T3 (de)
FR (1) FR2827377B1 (de)

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Also Published As

Publication number Publication date
US6666140B2 (en) 2003-12-23
JP2003050100A (ja) 2003-02-21
ES2266424T3 (es) 2007-03-01
EP1275931A1 (de) 2003-01-15
DE60212905T2 (de) 2007-01-25
US20030010243A1 (en) 2003-01-16
JP3679386B2 (ja) 2005-08-03
ATE332486T1 (de) 2006-07-15
FR2827377A1 (fr) 2003-01-17
DE60212905D1 (de) 2006-08-17
FR2827377B1 (fr) 2003-12-05

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