EP0143071A1 - Procédé de fabrication d'un allumeur électrique, allumeur ainsi obtenu et son application - Google Patents

Procédé de fabrication d'un allumeur électrique, allumeur ainsi obtenu et son application Download PDF

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Publication number
EP0143071A1
EP0143071A1 EP84810225A EP84810225A EP0143071A1 EP 0143071 A1 EP0143071 A1 EP 0143071A1 EP 84810225 A EP84810225 A EP 84810225A EP 84810225 A EP84810225 A EP 84810225A EP 0143071 A1 EP0143071 A1 EP 0143071A1
Authority
EP
European Patent Office
Prior art keywords
process step
ignition
photoresist
carrier material
ignition device
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.)
Withdrawn
Application number
EP84810225A
Other languages
German (de)
English (en)
Inventor
Harry Dr. Züst
Peter Hepper
Ernst Uhlmann
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.)
Fela E Uhlmann AG fur Gedruckte Schaltungen
Original Assignee
Fela E Uhlmann AG fur Gedruckte Schaltungen
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 Fela E Uhlmann AG fur Gedruckte Schaltungen filed Critical Fela E Uhlmann AG fur Gedruckte Schaltungen
Publication of EP0143071A1 publication Critical patent/EP0143071A1/fr
Withdrawn legal-status Critical Current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
    • F42B3/195—Manufacture
    • F42B3/198—Manufacture of electric initiator heads e.g., testing, machines
    • 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 invention relates to a method for producing an electrical ignition device firmly adhering to a carrier material, to an ignition device produced according to it and to the use thereof.
  • Electrical ignition devices which consist of thin, electrically conductive material and are ignited via a gap, are known (DE-A-28 16 300).
  • a metal layer is applied directly to a finely machined surface of an insulating body, which essentially consists of glass. Fuses made in this way have good mechanical resistance compared to previously known fuses, but their manufacture is very expensive.
  • the surface to which the metal layer is applied must be smoothed very well beforehand by grinding and polishing, the deviations being at most in the micrometer range.
  • Several layers of metal are usually applied, the uppermost layer mostly consisting of gold or a similar metal.
  • the known technique consists in evaporating the metal layers. The entire surface is often covered with a metal layer and then mechanically or with physical methods, ignition gaps are attached using complex equipment.
  • the invention has for its object to provide a method for producing an electrical ignition device, and to economically manufacture ignition devices with the required small manufacturing tolerances, which also endure extremely high accelerations.
  • the resistance of the ignition path should also be able to be exactly implemented in series production according to specified or desired values.
  • this object is achieved in that a galvanically conductive ignition path is formed from a printed circuit board by means of a photoetching process in its configuration.
  • the advantage of the invention is that the photo-etching process eliminates the need for extensive post-processing of the surface of the insulating element and the need for making cutouts to produce a contact bridge.
  • an adhesive layer is advantageously applied to the carrier material in a first method step, in a second method step a resistance layer provided with a carrier film is applied to the adhesive layer, which is pressed in a third method step at elevated pressure and temperature, in one fourth process step, the carrier film is removed, in a fifth process step the printed circuit board is coated on both sides with photoresist and exposed, in a sixth process step the resistive layer is etched, in a seventh process step the photoresist is removed on both sides, in an eighth process step the ignition path is covered with photoresist , in a ninth process step the hole is made, in a tenth process step there is a first copper plating, in an eleventh process step the non-conductor image is coated with photoresist, in a twelfth process ahrenspfer a second copper plating, in a thirteenth process step is tinned, in a fourteenth process step, the photoresist is removed, in a fifteenth process step is ammonia
  • carrier material which consists of a mixture of glass and epoxy resin. Compared to pure glass, porcelain or plastic, this material has the advantage that it has the stretching properties of the individual components, but is also able to allow a permanent adhesive bond due to its epoxy content.
  • the carrier film is advantageously made of aluminum, to which a CrNi alloy is applied.
  • Aluminum as a carrier film has the advantage that its surface is made very smooth due to the manufacturing process and a relatively poor adhesion of CrNi / Al facilitates the subsequent separation.
  • the chromium-nickel alloy is applied to a carrier film by sputtering.
  • This type of atomization technique has the advantage that the otherwise difficult to vaporize CrNi alloy can be deposited evenly in a sufficiently thin layer on, for example, aluminum as a carrier film.
  • the surface of the carrier material with an adhesive layer, which can also be a composite film.
  • This adhesive layer advantageously consists, according to claim 7, of a prepolymerized epoxy resin.
  • the application is advantageously carried out by brushing onto the carrier material.
  • the composite film can also consist of polyimide or an epoxy resin reinforced with a fabric.
  • the ignition path advantageously consists of a chromium-nickel alloy. This can be applied in a sufficiently thin layer and is largely mechanically and chemically stable.
  • the adhesive layer is bonded to the backing material at a pressure of 20 to 40 bar, preferably at 30 bar, and a temperature of 150 ° to 190 ° C, preferably at 170 ° C. This creates a permanent chemical cross-linking between the epoxy resin of the carrier material and the epoxy resin polymerized under these conditions.
  • the carrier film it is advantageous to etch off the carrier film from the resistance layer, which is now connected to the circuit board, by means of alkali.
  • a dilute sodium hydroxide solution has proven to be advantageous with aluminum as the carrier film.
  • the carrier film can simply be removed mechanically from the conductive layer.
  • the ignition path is covered with a photoresist for protection. This determines the active ignition distance.
  • a first copper plating is carried out chemically in order to obtain a layer of 4 to 5 ⁇ m Cu also within the bore, so as to obtain a galvanic plated-through hole in the top of the printed circuit board and the lower contact surface.
  • a second copper plating is carried out galvanically. This has the advantage that the copper layer can be reinforced on the non-coating conductive parts to about 25 pm in the shortest possible time.
  • tinning in a layer of 3 to 5 ⁇ m is carried out galvanically wherever copper is deposited. This creates a shiny tin layer on the conductor pattern.
  • an alloy of lead and tin is used.
  • the ignition device is characterized in that a galvanically conductive ignition path is provided, which has a constant cross-section over its entire length and ends in contact surfaces.
  • the ignition path is formed in its length to width in a ratio of at least approximately 50: 1.
  • the ignition path preferably consists of CrNi and has a resistance of 5 to 30 ohms, preferably 15 ohms. These resistance values have proven to be particularly advantageous for firing in missiles.
  • the resistance layer from an alloy of 80% chromium and 20% nickel. This results in ignition bridges with very suitable electrical resistances.
  • the ignition device is used in highly accelerated ammunition bodies which are also exposed to very high lateral accelerations.
  • FIG. 1 the support body of an electrical ignition device is shown. 1 with a support material made of glass epoxy resin is called.
  • the carrier material 1 is provided with a lower contact surface 2 and with upper contact surfaces 3, 3 'made of copper.
  • An eccentrically arranged bore 4 is plated through with copper.
  • An ignition path 5 is present between the contact surfaces 3, 3 '.
  • the ignition path 5 is part of a resistance layer 5, 6, 6 'made of a chromium-nickel alloy, with contact surfaces at the end being designated by 6, 6'.
  • the ignition device explained above is thus formed from a printed circuit board 10.
  • Fig. 2 the underside of the ignition device is Darge provides a circular copper layer as the contact surface 2, which is connected via the bore 4 with the contact surfaces 6, 6 '.
  • FIG. 4 A further illustration of the ignition path 5 is shown in FIG. 4, in which it can be seen as a bridge between the contact surfaces 6 and 6 ', and whose length is denoted by 1 and its width by b. l: b here is 50: 1; the thickness of the chrome-nickel layer is 5 pm. The specified electrical resistance is 15 ohms for the alloy used.
  • Figure 5 shows a carrier film 8 in the upper part of the figure, which is applied to the resistance layer 5, 6, 6 ', and the state before joining with the carrier material 1 with the adhesive layer 7 applied thereon in the lower part of the figure.
  • the hole 4 shown in dashed lines is only made after the polymerization.
  • the resistance layer 5, 6, 6 ′ made of CrNi with a thickness of 3 to 10 ⁇ m, preferably 5 ⁇ m, is applied to the carrier film 8 made of aluminum with a layer thickness of approximately 0.1 mm.
  • the printed circuit board 10 thus formed is provided on the underside with a contact surface 2, which consists of a copper layer of 10 to 20 ⁇ m, preferably 17 ⁇ m, of copper.
  • an adhesive layer 7 made of prepolymerized epoxy resin was applied to the top of the carrier material 1.
  • the resistance layer 5, 6, 6 ' for example 5 ⁇ m thick, was applied to the aluminum film by sputtering.
  • Carrier material 1 provided as an adhesive layer 7 is pressed on and connected to it under increased pressure and elevated temperatures.
  • the aluminum foil which serves only as a manipulation and protective foil, was removed. The removal was carried out by etching with dilute NaOH (15% by weight). However, it can also be removed by mechanical removal.
  • the body freed from the carrier film 8 was now coated on the contact surface 2 and the resistance layer 5, 6, 6 'with photoresist and then exposed. Thereafter, the top side provided with CrNi was treated with iron (III) chloride or copper (II) chloride HC1 (1: 1) or HN0 3 (1: 1) and the CrNi was thus etched off and the remaining photoresist was removed using a methyl solvent. Iso-butyl ketone loosened on both sides (stripped). However, other organic solvents can also be used for stripping.
  • the ignition section 5 was covered with the same photoresist.
  • the bore 4 for the printed circuit board 10 was made in a known manner.
  • the entire body was then chemically copper-coated with a layer of 4 to 5 pm copper.
  • the inner wall of the bore 4 was simultaneously covered with a copper layer and thus galvanically plated through between the lower contact surface 2 and the upper contact surfaces 3, 3 '.
  • photoresist was coated on both sides, exposed, developed and the copper layer galvanically reinforced on both sides to 25 .mu.m.
  • a layer of 3 to 5 pm tin was electrodeposited onto the copper layer to form a bright tin layer.
  • the photoresist was then stripped with solvent and the conductive patterns on the front and back were ammoniacally etched.
  • the ignition path 5 is now only coated with photoresist which has been removed by stripping with solvent, as a result of which the ignition path 5 is exposed.
  • the use of aluminum as a carrier film has the particular advantage that it can be easily manipulated, that its smooth surface is transferred to the resistance layer and that all traces of aluminum can be removed simply and completely by chemical means. Also, according to the method according to the invention, it is not necessary to smooth the surface of the carrier material by polishing in the usual way.
  • Another advantage of the ignition device according to the invention is the easy possibility of adapting the resistance of the ignition path by appropriate dimensioning to the ignition conditions. If required with high accuracy, this can also be done in a manner known per se by trimming the exposed ignition path.
  • the technology according to the invention is particularly suitable for use in miniature primers of a few millimeters in diameter.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
EP84810225A 1983-11-18 1984-05-09 Procédé de fabrication d'un allumeur électrique, allumeur ainsi obtenu et son application Withdrawn EP0143071A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6207/83 1983-11-18
CH620783 1983-11-18

Publications (1)

Publication Number Publication Date
EP0143071A1 true EP0143071A1 (fr) 1985-05-29

Family

ID=4305965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84810225A Withdrawn EP0143071A1 (fr) 1983-11-18 1984-05-09 Procédé de fabrication d'un allumeur électrique, allumeur ainsi obtenu et son application

Country Status (2)

Country Link
EP (1) EP0143071A1 (fr)
ZA (1) ZA848163B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5204491A (en) * 1990-11-27 1993-04-20 Thomson -- Brandt Armements Pyrotechnic detonator using coaxial connections
WO2006038703A1 (fr) * 2004-10-04 2006-04-13 Nipponkayaku Kabushikikaisha Appareil a circuit de raccordement en semiconducteur et allumeur l’incorporant

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935718A (en) * 1954-02-11 1960-05-03 Atlas Powder Co Electric match assembly
FR2013677A1 (fr) * 1968-07-25 1970-04-03 Dynamit Nobel Ag
FR2090579A5 (fr) * 1970-04-24 1972-01-14 Dynamit Nobel Ag
FR2284860A1 (fr) * 1974-09-13 1976-04-09 Dynamit Nobel Ag Amorce explosive combinee
US3974424A (en) * 1974-10-07 1976-08-10 Ici United States Inc. Variable resistance bridge element
BE840674A (fr) * 1976-04-13 1976-10-13 Amorce pour mise a feu electrique de charges propulsives, explosives et similaires
FR2388246A1 (fr) * 1977-04-19 1978-11-17 Bofors Ab Dispositif d'allumage electrique
GB2057643A (en) * 1979-09-03 1981-04-01 Bofors Ab Electric igniter
EP0076210A1 (fr) * 1981-09-28 1983-04-06 ETAT-FRANCAIS représenté par le Délégué Général pour l' Armement Initiateur pyrotechnique électrique à effet Joule

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935718A (en) * 1954-02-11 1960-05-03 Atlas Powder Co Electric match assembly
FR2013677A1 (fr) * 1968-07-25 1970-04-03 Dynamit Nobel Ag
FR2090579A5 (fr) * 1970-04-24 1972-01-14 Dynamit Nobel Ag
FR2284860A1 (fr) * 1974-09-13 1976-04-09 Dynamit Nobel Ag Amorce explosive combinee
US3974424A (en) * 1974-10-07 1976-08-10 Ici United States Inc. Variable resistance bridge element
BE840674A (fr) * 1976-04-13 1976-10-13 Amorce pour mise a feu electrique de charges propulsives, explosives et similaires
FR2388246A1 (fr) * 1977-04-19 1978-11-17 Bofors Ab Dispositif d'allumage electrique
GB2057643A (en) * 1979-09-03 1981-04-01 Bofors Ab Electric igniter
EP0076210A1 (fr) * 1981-09-28 1983-04-06 ETAT-FRANCAIS représenté par le Délégué Général pour l' Armement Initiateur pyrotechnique électrique à effet Joule

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5204491A (en) * 1990-11-27 1993-04-20 Thomson -- Brandt Armements Pyrotechnic detonator using coaxial connections
WO2006038703A1 (fr) * 2004-10-04 2006-04-13 Nipponkayaku Kabushikikaisha Appareil a circuit de raccordement en semiconducteur et allumeur l’incorporant
US7748323B2 (en) 2004-10-04 2010-07-06 Nipponkayaku Kabushikikaisha Semiconductor bridge device and igniter including semiconductor bridge circuit device
JP4746554B2 (ja) * 2004-10-04 2011-08-10 日本化薬株式会社 半導体電橋装置および半導体電橋装置を備える点火具

Also Published As

Publication number Publication date
ZA848163B (en) 1985-06-26

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19860527

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Inventor name: UHLMANN, ERNST

Inventor name: ZUEST, HARRY, DR.

Inventor name: HEPPER, PETER