EP0112254A1 - Elektrischer Brückenzünder - Google Patents

Elektrischer Brückenzünder Download PDF

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Publication number
EP0112254A1
EP0112254A1 EP83402426A EP83402426A EP0112254A1 EP 0112254 A1 EP0112254 A1 EP 0112254A1 EP 83402426 A EP83402426 A EP 83402426A EP 83402426 A EP83402426 A EP 83402426A EP 0112254 A1 EP0112254 A1 EP 0112254A1
Authority
EP
European Patent Office
Prior art keywords
primer
printed circuit
primer according
envelope
pyrotechnic composition
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
EP83402426A
Other languages
English (en)
French (fr)
Other versions
EP0112254B1 (de
Inventor
Joseph Refouvelet
René Santolaria
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 pour lArmement DGA
Etat Francais
Original Assignee
Direction General pour lArmement DGA
Etat Francais
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9280117&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0112254(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Direction General pour lArmement DGA, Etat Francais filed Critical Direction General pour lArmement DGA
Priority to AT83402426T priority Critical patent/ATE33901T1/de
Publication of EP0112254A1 publication Critical patent/EP0112254A1/de
Application granted granted Critical
Publication of EP0112254B1 publication Critical patent/EP0112254B1/de
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
    • F42B3/12—Bridge initiators
    • F42B3/124—Bridge initiators characterised by the configuration or material of the bridge

Definitions

  • a known technique uses deposition by vacuum projection, with masking of a thin metallic layer, possibly adjusted by chemical or laser etching. This technique makes it possible to produce circuits of good definition and of high ohmic resistance value per unit area.
  • the metallic layer obtained remains very thin (L 1 pn), very fragile, sensitive to oxidation and aging and not very resistant to severe thermal or climatic environments. In addition, this manufacturing technique is expensive.
  • High-precision printed circuits such as those described in French patents 2,344,490 and 2,354,617. These circuits are of the type, for example in the case of filamentary resistive circuits, of those having very fine width filaments of the order of 10 ⁇ m and interfilamentary grooves whose width is less than 10 ⁇ m. This results in a very high ohmic value per unit area.
  • High precision printed circuits necessarily have edges with a defined profile and can be obtained by various techniques of selective electrolytic etching, or ion spraying, or photolithographic methods.
  • the present invention aims to overcome the drawbacks encountered in the production of resistive elements for electrical primers by adapting to this application the techniques for manufacturing highly precise printed circuits used in the field of microelectronics. It follows that the resistive elements thus designed have a high resistance in a reduced space imposed in an electrical primer with high sensitivity.
  • the invention therefore relates to an electrical primer comprising a pyrotechnic composition initiated by a resistive heating element, characterized in that the resistive element consists of a high-precision printed circuit having at least one filamenr of width between 5 and 80 p m, etched for example by electrolytic or ionic machining from a masked metal sheet.
  • the printed circuit consists of a thin annular substrate metallized on its two faces which are electrically connected by a metallized hole. It follows a considerable simplification of the resumption of electrical contacts and therefore of the definition of the initiator.
  • Another subject of the invention is an electrical primer as described above, characterized in that the printed circuit is connected twice with electrical contacts formed, for one by a central stud formed in the bottom of the primer, and for the other by an internal envelope separating the pyrotechnic composition and the external envelope in the upper part of the primer.
  • the two electrical contact sockets can be coaxial, the inner casing having an upper ring electrically connected to the metallic outer casing, the central stud being electrically isolated from the bottom of the primer formed by this same metallic outer casing.
  • the assembly of the components in the enclosure is facilitated and the electrical contacts can be made by simple pressure.
  • the advantages of the primer according to the invention are therefore to present a resistive heating element of high precision and small dimensions, etched on a surface of approximately 10 ⁇ m, of high electrical resistance (10 to 100 ohms), usable in harsh mechanical and thermal environments, and achievable in complex forms for particular applications.
  • the primer according to the invention comprises an approximately cylindrical external metallic envelope 1 containing the pyrotechnic charge 2 and the resistive heating element designated under the general reference 3.
  • the pyrotechnic charge is separated from the external metallic envelope 1 by a metal bucket 4, or internal cell, the bottom of which is provided with a central opening 5.
  • the useful pyrotechnic charge 2 is covered by a straw 2a which compresses this charge 2 towards the resistive element 3. This- it is in direct contact with the pyrotechnic charge 2 through the central opening 5 of the metal cup 4.
  • the resistive element 3 is a high-precision printed circuit consisting of a substrate 31, for example made of epoxy glass, metallized on its two upper 32 and lower 33 faces. Each face is engraved according to the desired design, the upper face carrying the etching of the fine resistive wire 34, which, by the Joule effect, initiates the payload 2.
  • the etchings of these highly precise printed circuits have grooves of width on the order of 5 yn, and the width of the filament is around 10 ⁇ m.
  • the thickness of the metal layer is of the order of 5 pn.
  • the printed circuit thus produced must have a high density of chronic value, of the order of at least 80 k ⁇ per cm2.
  • resistors engraved on a flat support
  • ion bombardment techniques on a thin metallic sheet fixed on an insulating support: a mask is applied having grooves whose edges correspond to the outline of the electrical resistant circuit to be etched, which is done selectively by placing the mask , the sheet and the support in an ion beam of an inert gas which have a kinetic energy higher than the bond energy of the atoms constituting the mask and the sheet.
  • the resistors thus produced have very good mechanical and thermal resistance. They are preferably made of nickel-chromium alloy having a resistivity of the order of 130 ⁇ ⁇ cm.
  • the two faces of the printed circuit are connected by a metallized hole 35.
  • FIG. 2 appear the two annular electrodes 36 and 37 of the upper face 32, connected by the resistive filament 34 itself, appearing for example radially with respect to the concentric ring electrodes.
  • the printed circuit 3, in the form of a perforated washer is electrically connected to a central conductive stud 6, retained in the bottom of the metallic outer casing 1 isolated from it by an alveolus or insulating sheath 7, the upper edge 7a of which comes guide and maintain the printed circuit 3. It is also electrically connected by its crown 37 located on the upper face 32 to the part 4a of the internal conductive cell 4 which has an upper crown 4b supported on the upper edge of the casing 1 These electrical contacts are made by pressure.
  • the assembly of the components of the primer is explained below, and carried out using multiple tools allowing several tens of primers to be produced simultaneously.
  • the insulating cell 7 is placed inside the outer casing 1.
  • the central stud 6 is introduced into the bottom of the previous assembly by pressing with a punch.
  • the washer constituting the printed circuit is then guided and held by the upper edge of the insulating cell.
  • the outer cell 4 is fixed and it is brought into contact with the metallized peripheral ring on the upper face of the printed circuit.
  • the pyrotechnic composition 2 is then loaded which is compressed and which is covered with a straw 2a.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Thermistors And Varistors (AREA)
EP83402426A 1982-12-15 1983-12-15 Elektrischer Brückenzünder Expired EP0112254B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83402426T ATE33901T1 (de) 1982-12-15 1983-12-15 Elektrischer brueckenzuender.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8221008 1982-12-15
FR8221008A FR2538099B1 (fr) 1982-12-15 1982-12-15 Amorce electrique a element resistif

Publications (2)

Publication Number Publication Date
EP0112254A1 true EP0112254A1 (de) 1984-06-27
EP0112254B1 EP0112254B1 (de) 1988-04-27

Family

ID=9280117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83402426A Expired EP0112254B1 (de) 1982-12-15 1983-12-15 Elektrischer Brückenzünder

Country Status (4)

Country Link
EP (1) EP0112254B1 (de)
AT (1) ATE33901T1 (de)
DE (1) DE3376452D1 (de)
FR (1) FR2538099B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6538378B1 (en) 1999-06-11 2003-03-25 Photoscience Japan Corporation Low-pressure mercury vapor discharge lamp and ultraviolet-ray irradiating apparatus and method using the same
US7089861B2 (en) * 2003-01-28 2006-08-15 Hirtenberger-Schaffler Automotive Zunder Ges. M.B.H. Heating element for igniting pyrotechnic charge
WO2015018828A1 (de) * 2013-08-05 2015-02-12 Ruag Ammotec Gmbh Elektrisches anzündhütchen für kleinkaliber-munition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698687B1 (fr) * 1992-12-01 1995-02-03 Giat Ind Sa Initiateur pyrotechnique.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA581316A (en) * 1959-08-11 Canadian Industries Limited Blasting caps with printed circuit bridge
FR2013677A1 (de) * 1968-07-25 1970-04-03 Dynamit Nobel Ag
FR2090579A5 (de) * 1970-04-24 1972-01-14 Dynamit Nobel Ag
FR2284860A1 (fr) * 1974-09-13 1976-04-09 Dynamit Nobel Ag Amorce explosive combinee
FR2344940A1 (fr) * 1976-03-18 1977-10-14 Electro Resistance Procede pour la fabrication de resistances electriques a partir d'une feuille metallique fixee sur un support isolant et dispositif s'y rapportant
FR2354617A1 (fr) * 1976-06-08 1978-01-06 Electro Resistance Procede pour la fabrication de resistances electriques a partir de feuilles ou de films metalliques et resistances obtenues
DE2701373A1 (de) * 1977-01-14 1978-07-20 Heidenhain Gmbh Dr Johannes Verfahren zum herstellen einer widerstandsschicht
DE3124420A1 (de) * 1980-06-23 1982-06-03 Inventa Aktiengesellschaft für Forschung und Patentverwertung Zürich, 8006 Zürich Verfahren zur erhoehung der waermeenergie in elektrisch leitenden duennschichten

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA581316A (en) * 1959-08-11 Canadian Industries Limited Blasting caps with printed circuit bridge
FR2013677A1 (de) * 1968-07-25 1970-04-03 Dynamit Nobel Ag
FR2090579A5 (de) * 1970-04-24 1972-01-14 Dynamit Nobel Ag
FR2284860A1 (fr) * 1974-09-13 1976-04-09 Dynamit Nobel Ag Amorce explosive combinee
FR2344940A1 (fr) * 1976-03-18 1977-10-14 Electro Resistance Procede pour la fabrication de resistances electriques a partir d'une feuille metallique fixee sur un support isolant et dispositif s'y rapportant
FR2354617A1 (fr) * 1976-06-08 1978-01-06 Electro Resistance Procede pour la fabrication de resistances electriques a partir de feuilles ou de films metalliques et resistances obtenues
DE2701373A1 (de) * 1977-01-14 1978-07-20 Heidenhain Gmbh Dr Johannes Verfahren zum herstellen einer widerstandsschicht
DE3124420A1 (de) * 1980-06-23 1982-06-03 Inventa Aktiengesellschaft für Forschung und Patentverwertung Zürich, 8006 Zürich Verfahren zur erhoehung der waermeenergie in elektrisch leitenden duennschichten

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6538378B1 (en) 1999-06-11 2003-03-25 Photoscience Japan Corporation Low-pressure mercury vapor discharge lamp and ultraviolet-ray irradiating apparatus and method using the same
US7089861B2 (en) * 2003-01-28 2006-08-15 Hirtenberger-Schaffler Automotive Zunder Ges. M.B.H. Heating element for igniting pyrotechnic charge
WO2015018828A1 (de) * 2013-08-05 2015-02-12 Ruag Ammotec Gmbh Elektrisches anzündhütchen für kleinkaliber-munition
US10415944B2 (en) 2013-08-05 2019-09-17 Ruag Ammotec Gmbh Electronic primer cap for small-caliber ammunition

Also Published As

Publication number Publication date
ATE33901T1 (de) 1988-05-15
DE3376452D1 (en) 1988-06-01
FR2538099A1 (fr) 1984-06-22
EP0112254B1 (de) 1988-04-27
FR2538099B1 (fr) 1986-10-03

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