EP1143218A1 - Widerstandselement für einen pyrotechnischen Zünder - Google Patents

Widerstandselement für einen pyrotechnischen Zünder Download PDF

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Publication number
EP1143218A1
EP1143218A1 EP01400638A EP01400638A EP1143218A1 EP 1143218 A1 EP1143218 A1 EP 1143218A1 EP 01400638 A EP01400638 A EP 01400638A EP 01400638 A EP01400638 A EP 01400638A EP 1143218 A1 EP1143218 A1 EP 1143218A1
Authority
EP
European Patent Office
Prior art keywords
resistive
layer
resistive element
substrate
element according
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
EP01400638A
Other languages
English (en)
French (fr)
Other versions
EP1143218B1 (de
Inventor
Claude Flassayer
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.)
Vishay SA
Original Assignee
Vishay 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 Vishay SA filed Critical Vishay SA
Publication of EP1143218A1 publication Critical patent/EP1143218A1/de
Application granted granted Critical
Publication of EP1143218B1 publication Critical patent/EP1143218B1/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
    • F42B3/13—Bridge initiators with semiconductive bridge

Definitions

  • the present invention relates to a resistive element for electro-pyrotechnic ignition or ignition initiator detonation.
  • Pyrotechnic initiators are increasingly used in automotive safety devices, in particular for controlling the operation of cushions inflatable or seat belt tensioners, and generally consist of a container containing a pyrotechnic composition which is brought to its deflagration temperature on contact with a electrically resistant filament or layer heated by Joule effect.
  • the filament or layer electrically resistant are usually fixed on a insulating substrate and connected to supply terminals of Electric power.
  • Figure 1 shows a pyrotechnic initiator of the prior art comprising a glass-to-metal crossing 2, a resistive element 4 connected to connections of outlet, a first container 6 containing a charge primary explosive 8, and a second container 10 containing a secondary explosive charge 12.
  • the element resistive is shown schematically in Figure 2 and comprises an alumina substrate 14, a resistive layer 16 deposited on the substrate 14, an adhesion layer 18 on which is deposited a conductive layer 20 and a welding coating 22 covering the layer conductive 20 to establish electrical contact with current supply terminals 23.
  • Figure 3 illustrates another resistive element according to the prior art consisting of a silicon substrate 24 on which is carried out a diffused resistance 26, and is deposited a contact layer 28.
  • Alumina and silicon, respectively forming substrates 14, 24 of the resistive elements of FIGS. 2 and 3, have a high thermal conductivity, respectively equal to 0.3 w / cm ° C and to 1.46 w / cm ° C.
  • a significant part of the dissipated heat by the resistive layers 16, 26 is transmitted to the substrate 14, 24 and is no longer available for heating the pyrotechnic composition.
  • the energy consumed by the pyrotechnic initiator is then much more higher than the energy required to initiate the composition pyrotechnic and the low consumption requirement is not satisfied.
  • the specifications of these pyrotechnic initiators impose a "fire-free” interval ",” all-fire "more and more narrow. Indeed, when applying to a pyrotechnic initiator a specified current pulse "all-fire” the initiator must operate with a probability close to 1. By against, when we apply to this initiator a impulse specified "non-fire", representing a parasitic pulse, the initiator must not function. However, the heat dissipated by the layer resistive 16, 26 is transmitted to the substrate 14, 24 of so that the energy dissipated by the joule effect does not not only heats the resistive layer 16, 26, but the assembly formed by this resistive layer 16, 26 and the substrate 14, 24 whose thermal mass equivalent depends on the thermal conductivity and the specific heat of the substrate 14, 24.
  • the purpose of this invention is to overcome the disadvantages of the prior art cited above.
  • a resistive element comprising a substrate on which a layer is fixed resistive partially covered by a layer conductive ensuring electrical contact with two electric current supply terminals.
  • the substrate is produced in a material with thermal and electrical conductivity and a surface finish, comparable to that of glass.
  • the thermal energy dissipated by the Joule effect by the resistive layer is channeled to the explosive.
  • the glass has a very good state of surface, it lends itself perfectly to the use of high resolution thin film deposition processes for the realization of the resistive layer.
  • the conductive layer surrounds the resistive layer and the substrate so as to form two contact zones connected by a central portion of the resistive layer.
  • This embodiment is made possible thanks to the use of a material like glass which presents very low electrical conductivity (otherwise the resistive filament would be short-circuited by the substrate leakage resistance).
  • the resistive layer is produced on the substrate by a process for producing layers thin at high resolution.
  • Figure 4 shows schematically an element resistive 4 for electro-pyrotechnic initiator ignition or detonation comprising a substrate 14 on which is fixed a first resistive layer 16.
  • the resistive layer 16 is partially covered by a conductive layer 20 ensuring electrical contact with two terminals 23 for supplying electric current.
  • the conductive layer 20 surrounds the resistive layer 16 and the substrate 14 in two contact zones connected to the resistive layer 16 by a bonding layer 16a. The conductive layer 20 thus ensures the connection resistive layer 16 with terminals 23 of electric current represented in the Figures 5 to 7.
  • the substrate 14 is made of glass or in a material with electrical and thermal conductivities (e.g. 0.01 W / Cm ° C) very low, comparable to those of glass, as well as a surface finish such as that of glass, so as to allow the implementation processes for producing thin layers with high resolution.
  • electrical and thermal conductivities e.g. 0.01 W / Cm ° C
  • the resistive layer 16 is constituted by a layer slim.
  • the thin layer is made of homogeneous material for example in NiCr, Ta2N or CrSi.
  • heat dissipated by Joule effect by the resistive layer is transmitted to the pyrotechnic composition by thermal conduction.
  • the resistive layer 16 is consisting of a thin layer of composite material, for example in Ta2n-Zr, NiCr-Zr or Ta2N-Ti.
  • the layer conductive heated by the upper resistive layer 16, sublimates and causes the formation of a plasma which condenses on the pyrotechnic composition and increases its temperature.
  • the heat dissipated by joule effect by the resistive layer 16 is transmitted to the composition pyrotechnic by thermal conduction and by effect plasma.
  • the resistive layer 16 is made of silicon, by example in amorphous silicon deposited on glass.
  • the resistive element 4 is mounted on a base 30 crossed by two terminals current supply 23.
  • the base can be made of a material electrically insulating. If it consists of a metal part, an insulating washer 29 must be inserted between the base 30 and the resistive element 4.
  • FIGS 5 to 7 illustrate three modes of connection of the resistive element 4 with the terminals current supply 23.
  • the electrical contact between the resistive element 4 and the terminals 23 is produced by welding on glass-metal protruding bushings.
  • the connections of the resistive element 4 with the current supply terminals 23 are made by the edge thus making the resistive element compatible with surface mounting techniques.
  • the element resistive can then be mounted on supports intermediates with surge suppressors, energy storage capacitors and circuits integrated control.
  • the electrical connection of the resistive layer 16 with terminals 23 can be direct or carried out through an intermediate circuit, by example a printed circuit 32, which includes other components 31 useful for the operation of the device, such as a varistor, capacitor, etc. (figure 7).
  • the fixing of the element resistive 4 and the electrical contact between it and terminals 23 is carried out via the printed circuit 32 fixed on the base 30.
  • the circuit printed has a layer of copper 33 forming two separate areas in electrical contact respectively with terminals 23 and element contact areas resistive 4 and component 31, which are welded to the printed circuit.
  • the use of a glass substrate allows to use very low heating elements volume, and of very low mass in view of their integration in pyrotechnic initiators of very low energy, 0.1mJ for example. It also allows use small volume heating elements, and low mass with a view to their integration into medium energy pyrotechnic initiators, 1mJ per example. In this case, the energy which is no longer dissipated in pure loss in the substrate can heat a greater mass of resistive material. The increase in the mass of the resistive material is resulting in an increase in the resistive surface, allows the use of pyrotechnic compositions of larger particle size and facilitates the process of manufacture of pyrotechnic initiators.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Non-Adjustable Resistors (AREA)
EP01400638A 2000-04-04 2001-03-09 Widerstandselement für einen pyrotechnischen Zünder Expired - Lifetime EP1143218B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0004294A FR2807157B1 (fr) 2000-04-04 2000-04-04 Element resistif pour initiateur pyrotechnique
FR0004294 2000-04-04

Publications (2)

Publication Number Publication Date
EP1143218A1 true EP1143218A1 (de) 2001-10-10
EP1143218B1 EP1143218B1 (de) 2004-08-11

Family

ID=8848854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01400638A Expired - Lifetime EP1143218B1 (de) 2000-04-04 2001-03-09 Widerstandselement für einen pyrotechnischen Zünder

Country Status (4)

Country Link
EP (1) EP1143218B1 (de)
AT (1) ATE273500T1 (de)
DE (1) DE60104754T2 (de)
FR (1) FR2807157B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004076960A1 (de) * 2003-02-27 2004-09-10 Dynitec Gmbh Elektrischer detonator
CN103675451A (zh) * 2012-09-06 2014-03-26 北京理工大学 一种测量炸药爆轰过程电导率的装置及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111174652B (zh) * 2019-09-30 2022-09-27 深圳市开步电子有限公司 一种起爆电阻及爆破装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3537820A1 (de) * 1985-10-24 1987-04-30 Dynamit Nobel Ag Elektronischer zuender
WO1996024024A1 (en) * 1995-01-31 1996-08-08 Quantic Industries, Inc. Improved semiconductor bridge explosive device
WO1997042462A1 (en) * 1996-05-09 1997-11-13 Scb Technologies, Inc. Semiconductor bridge device and method of making the same
WO1998028792A1 (en) * 1996-12-23 1998-07-02 Scb Technologies, Inc. Surface connectable semiconductor bridge elements, devices and methods
WO1998054535A1 (de) * 1997-05-26 1998-12-03 Temic Telefunken Microelectronic Gmbh Dünnschichtanzündelement für pyrotechnische wirkmassen und verfahren zu dessen herstellung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3537820A1 (de) * 1985-10-24 1987-04-30 Dynamit Nobel Ag Elektronischer zuender
WO1996024024A1 (en) * 1995-01-31 1996-08-08 Quantic Industries, Inc. Improved semiconductor bridge explosive device
WO1997042462A1 (en) * 1996-05-09 1997-11-13 Scb Technologies, Inc. Semiconductor bridge device and method of making the same
WO1998028792A1 (en) * 1996-12-23 1998-07-02 Scb Technologies, Inc. Surface connectable semiconductor bridge elements, devices and methods
WO1998054535A1 (de) * 1997-05-26 1998-12-03 Temic Telefunken Microelectronic Gmbh Dünnschichtanzündelement für pyrotechnische wirkmassen und verfahren zu dessen herstellung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004076960A1 (de) * 2003-02-27 2004-09-10 Dynitec Gmbh Elektrischer detonator
CN103675451A (zh) * 2012-09-06 2014-03-26 北京理工大学 一种测量炸药爆轰过程电导率的装置及方法

Also Published As

Publication number Publication date
EP1143218B1 (de) 2004-08-11
FR2807157B1 (fr) 2003-01-31
DE60104754T2 (de) 2005-01-05
FR2807157A1 (fr) 2001-10-05
DE60104754D1 (de) 2004-09-16
ATE273500T1 (de) 2004-08-15

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