CN101941410B - Electro-pyrotechnic initiator and manufacturing method thereof - Google Patents
Electro-pyrotechnic initiator and manufacturing method thereof Download PDFInfo
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- CN101941410B CN101941410B CN 201010225011 CN201010225011A CN101941410B CN 101941410 B CN101941410 B CN 101941410B CN 201010225011 CN201010225011 CN 201010225011 CN 201010225011 A CN201010225011 A CN 201010225011A CN 101941410 B CN101941410 B CN 101941410B
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- substrate
- cap shell
- firing device
- pyrotechnics
- electrode
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- 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
- F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
- F42B3/107—Sealing-plugs characterised by the material used
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- 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
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- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Air Bags (AREA)
Abstract
The invention relates to an electro-pyrotechnic initiator, comprising a cap (9), a printed circuit plate (7) with a heating resistive element (71) turned toward a pyrotechnic load (8), electrodes (4, 6) connected to the element (71), and a substrate (2) supporting the plate (7), wherein the cap (9) comprises a part (92) adhered to the part (23) corresponding to the substrate (2). According to the invention, a first part in the parts (23, 92) is plastic material opaque to a laser beam (FL) of determined wave length of welding, and the other part is made transparent plastic to the laser beam (FL) so as to transverse along direction to come across the first part by the laser beam (FL), thereby forming a zone (11) for welding parts (23, 92).
Description
Technical field
The present invention relates to a kind of electric pyrotechnics firing device and manufacture method thereof.
Background technology
These electric pyrotechnics firing devices are used as the pyrotechnics device for igniting in self-propelled vehicle, be used for triggering the gas generator for the inflatable air-bag inflation, or are used for triggering seat belt pretensioners.
This type of firing device generally includes cap shell, heat-resistant part and two electrodes, described cap shell comprises pyrotechnical charge (charge pyrotechnique), described heat-resistant part turns to pyrotechnical charge to light described pyrotechnical charge, and described two electrodes are electrically connected to described heat-resistant part to supply induced current as it from the outside.
Substrate, described substrate are provided for supporting whole device and are used for sealing airtightly described cap shell.
Two class firing devices are arranged at present.
First kind firing device provides glass bushing for each electrode in metallic substrates.This type of firing device has been guaranteed good sealing by mode and the assembly method of glass/metal sealing, can guarantee air-tightness between embossment part, main pyrotechnical charge container and the glass bushing by described assembly method.These firing devices have guaranteed to adapt to certain robustness of multiple possible climate environment, and are high but shortcoming is manufacturing cost.
The Equations of The Second Kind firing device is called the plastics device for igniting.Wherein substrate and cap shell all are that the electricity consumption insulating plastics material is made.These Equations of The Second Kind firing devices are poorer than first kind firing device leak preventing effect, and on the one hand owing to used the plastic material of moisture absorption, polyamide for example is on the other hand because being connected of metal electrode and plastic-substrates, for example secondary injection molding.On the other hand, the Equations of The Second Kind firing device has the advantage of low cost of manufacture.
First kind firing device can be from for example file US-B-6, and 936,303, understand among WO 2005/078377 and the EP-A-1319641.
The Equations of The Second Kind firing device can be from for example file FR-A-2885684, EP-A-1710532, US-A-5, and 648,634, understand among WO 03/058154, EP-A-1209436 and the DE-C-10106366.
Summary of the invention
The object of the invention provides a kind of electric pyrotechnics firing device that low cost of manufacture has again the advantage of externally good leak tightness that namely has, and allows to use low-cost printed circuit board (PCB) to be used for making heat-resistant part.
For this reason, first purpose of the present invention provides a kind of electric pyrotechnics firing device, and it comprises:
The cap shell that-electricity consumption insulating plastics material is made,
-at least one is in the pyrotechnical charge in the described cap shell,
-printed circuit board (PCB), described printed circuit board (PCB) comprises heat-resistant part, described heat-resistant part turns to pyrotechnical charge lighting described pyrotechnical charge,
-two the first and second electrodes are electrically connected on heat-resistant part in order to being from the outside the power supply of described heat-resistant part,
-substrate, described substrate electricity consumption insulating plastics material is made, and wherein is inserted with the first and second electrodes, and it supports described printed circuit board (PCB),
The part of described cap shell is coated with and is attached at the corresponding part of substrate, thereby cap shell and substrate define the compartment of a sealing, and described compartment comprises pyrotechnical charge and printed circuit board (PCB),
It is characterized in that, the part that is selected from described substrate is made with the plastic material that can not penetrate the laser beam with definite welding wavelength with the first of the part of described cap shell, and another second portion of the part that is selected from described substrate and the part of described cap shell is to make with the plastic material that can penetrate the laser beam with definite welding wavelength
The described laser beam that second portion is set to be had described definite welding wavelength penetrates along the direction of intersection first, to be formed for that first and second portion are welded in each other zone.
Embodiment in according to the present invention,
-second portion is made with the first definite plastic material that does not load fiber, and first makes with the described first definite plastic material that loads fiber.
-described first determines that plastic material is polyamide 6 .12, and described fiber is glass fibre.
-first is formed by the described part of described substrate, and second portion is formed by the described part of described cap shell.
-or first formed by the described part of described cap shell, and described second portion is formed by the described part of described substrate.
-described part definition is used for receiving the plastic material of at least in part thawing to form the device of welding region.
-before welding, selected in a described part part provides at least one fin, the surface engagement of described fin and at least one selected another part from described part.
-described receiving device is adjacent to fin.
-utilize the copper paste drops by laser welding that electrode is attached and be electrically connected to the printed wire of described plate.
-pyrotechnical charge comprises the pyrotechnics coating that covers on the printed circuit board (PCB), described substrate comprises for the side and at least one recess that receive printed circuit board (PCB), described recess is positioned at described side and is used for receiving printed circuit board (PCB), be between described printed circuit board (PCB) and the described cap shell, and described recess is used for pyrotechnics coating is fixed on the reception side.
-electrode comprises the striped part that is in the substrate.
-electrode stretches out from the first side and second side of substrate respectively, and described substrate is included in the space of the against electrode at least one side in the first and second sides.
-electrode stretches out from the first side of substrate and the second side of substrate respectively; the first lateral support of described substrate comprises the printed circuit board (PCB) of heat-resistant part; different from the first side is that described substrate comprises that in the second side at least one recess is used for providing at least one guard block that is connected to described electrode to prevent electrostatic discharge.
Second purpose of the present invention provides a kind of method of making above-mentioned electric pyrotechnics firing device, it is characterized in that the method may further comprise the steps at least, wherein:
-form assembly, comprise the substrate that is inserted with two the first and second electrodes, described the first and second electrodes are electrically connected to heat-resistant part,
-pyrotechnical charge is inserted into described cap shell at least in part,
-described assembly is pushed into described cap shell, so that heat-resistant part is in pyrotechnical charge one side, and places the described part of substrate with the part of described cap shell,
-described welding laser beam with described welding wavelength passes described second portion along the described downrange of intersection first, is soldered to each other to carry out first and second portion.
According to embodiments of the invention, the printed wire of printed circuit board (PCB) correspondingly comprises the first and second electrical connection pads, described electrical connection pad is electrically connected to the first and second ends of heat-resistant part, and the heat resister that comprises appointment in the described electrical connection pad, and for electrode electrically connected to heat-resistant part, need to carry out following substep:
-the first and second electrodes are attached to substrate, an end of wherein said the first and second electrodes passes respectively a side of substrate,
-printed circuit board (PCB) is placed the described side of substrate, the described end of wherein said the first and second electrodes is respectively adjacent to the first and second electrical connection pad settings,
-the first and second bronze medal paste drops are deposited on respectively the described end of the first and second electrodes,
-laser beam is applied to the copper paste drops, on the described end and the first and second electrical connection pads that it are melted in respectively the first and second electrodes.
According to embodiments of the invention, in order to insert pyrotechnical charge, deposit the pyrotechnics that forms a part of pyrotechnical charge at the heat-resistant part of described assembly and light the viscosity drops of composition, and will strengthen pyrotechnical charge insertion cap hull shape and become a part of pyrotechnical charge.
Description of drawings
To understand better the present invention by following description, only provide indefiniteness embodiment with reference to accompanying drawing, wherein:
-Fig. 1 be the schematic front axle of the exemplary firing device made according to the present invention to vertical cross-section diagram,
-Fig. 2 is the schematic perspective view for the embodiment of the printed circuit board (PCB) of Fig. 1 firing device,
-Fig. 3 be the schematic side of the part of firing device among Fig. 1 to vertical transverse cross-sectional profile figure, the part of described firing device is in laser beam and passes one of them reference position before welding,
-Fig. 4 is the schematic axial transverse cross-sectional profile figure of firing device substrate among Fig. 1,
-Fig. 5 is the schematic axial transverse cross-sectional profile figure of firing device among Fig. 1, and wherein said firing device is installed on the anchor fitting,
-Fig. 6 be the schematic side of the substrate of firing device among Fig. 1 to vertical transverse cross-sectional profile figure, wherein the general shape of substrate is not illustrated,
-Fig. 7 is that the schematic front axle of another embodiment of the firing device made according to the present invention is to vertical cross-section diagram.
The specific embodiment
In the accompanying drawings, firing device 1 comprises with not transmission having the substrate 2 that the first plastic material of the laser beam of definite wavelength is made.Substrate 2 comprises for the first pipeline 3 that inserts the first electrode 4, and the second pipe 5 that is used for inserting the second electrode 6.Pipeline 3 is different from pipeline 5.Electrode 4 is different from electrode 6.Electrode 4,6 conducts electricity and for example is metal.For example, electrode 4,6 is linear pattern and formed by metal pin respectively, thereby for example can be cylindrical and for example have circular cross-sectional plane.
The second side 22 of substrate 2 is printed with heat-resistant part 71 as the support of the plate 7 of printed wire 70 at plate 7.
Electrode 4, the second end 42,62 of 6 are electrically connected to heat-resistant part 71.Heat-resistant part 71 has the resistance of determining between first end 72 and the second end 73, and described first end 72 is electrically connected to electrode 4, and the second end 73 is electrically connected to electrode 6.Printed wire 70 also comprises the first connection gasket 74 and the second connection gasket 75 except heat-resistant part 71, described the first connection gasket 74 is connected to an end 72 of parts 71, and the second connection gasket 75 is connected to the other end 73 of parts 71.The resistance of connection gasket 74,75 resistance ratio heat-resistant part 71 is little.Plate 7 comprises and first surface 76 and second 77 is printed with heat-resistant part 71 and connection gasket 74,75 at described first surface 76, and described second 77 is separated with first surface 76, and be positioned on the second side 22 of substrate 2.Plate 7 also comprises not identical the first and second holes 78,79, and plate 7 76 is passed from face 77 to face in described the first and second holes 78,79.Hole 78 and 79 location are with adjacent or surrounded by pad 74,75 respectively as shown in the figure.The first and second holes 78 and 79 size are configured to respectively to pass respectively the second end 42 of electrode 4 and the second end of electrode 6, and stretch out from face 76 respectively at described two ends.The length of heat-resistant part 71 between its two ends 72,73 is greater than its width, extend in the space of this length between electrode 4,6, and extend along electrode 4,6 orientation, the circuit 70 that forms thus pad 74 with size reduction, 75 size reduction is possible.
Provide the conductive copper soldering paste in order to be electrically connected described end 42 to the pad 74, and connect described end 62 to the pad 75.
Heat-resistant part 71 is coated with one or more pyrotechnical charges 8,81,82.Cap shell 9 usefulness of plastic material decide pyrotechnical charge 8,82 container.Cap shell 9 comprises the first diapire 91 and makes the gap 94 outward extending parts 92 of diapire 91 that described the first diapire 91 defines the compartment of the sky that Open Side Down, and comprises pyrotechnical charge 8.Being designed and sized to so that its internal volume can comprise the pyrotechnical charge 8,82 of estimating reinforcement of the diapire 91 of cap shell 9.Diapire 91 has the top 910 away from gap 94, the priority area that described top 910 is lighted inner pyrotechnical charge 8 to be limited to, was used for the dividing cap shell at 82 o'clock with cone part 911.Top 910 can have Fig. 1 and shown in Figure 5 round-shaped, also can have aspect shown in Figure 7.
For this reason, part 92 covers the corresponding part 23 of substrate 2.
According to embodiments of the invention, the part 92 of the part 23 of the covering substrate 2 of cap shell 9 is plastic material, described plastic material is the laser beam F L that transmissive has definite wavelength, and the part 23 that is covered by part 92 of substrate 2 be not transmission this have the plastic material of the laser beam F L of definite wavelength.
Therefore, for attached cap shell 9 to substrate 2, laser beam F L is emitted to the part 92 of cap shell 9, is just penetrating the part 23 in substrate 2, for example at part 23,92 pre-contact area 11.Wavelength and the power of laser beam F L are scheduled to, and be suitable for guaranteeing partly the fusing of the opaque-plastic material of part 23, and the fusing that makes the light-passing plastic material of part 92 by contacting the heat conduction, with the welding region 11 with its weld together and forming section 23 and 92.By laser welding zone 11, can obtain good sealing and good mechanical strength.
For example, part 92 is formed by the wall with outside face 922 and inside face 923, and for example described outside face 922 is frusto-conical surface, and is protruding with respect to diapire 91, and described inside face 923 is also whole protruding with respect to wall 91.When the part 921 of inside face 923 was in position shown in Figure 3 with part 23 before their welding, match by form fit.For this reason, as shown in Figure 3, the part 23 of substrate 2 for example comprises the peripheral fin 231 of giving prominence to towards part 92, and part 92 comprises inside face 921, and described inside face 921 for example is conical butt.Therefore, for attached cap shell 9 to substrate 2, by the fin 231 of substrate 2 is inserted against the surface 921 of body 9 that cap shell 9 is pre-aligned in substrate 2, as shown in Figure 3.In unshowned other embodiment, inside face 921 for the plane and be level, be provided with fin 231 against inside face 921.
One or more recess or compartment 232,233 form in substrate 2, thereby can not can cause that by applying the plastic material that laser beam F L melts any flash ground flows.Therefore be provided as the form of receiving device to collect the plastic material of fusing.In the embodiment shown, when part 23 and part 92 place when over each other, part 23 comprises the first recess 232 that is adjacent to fin 231 inboards, and the second recess 233 that is adjacent to fin 231 outsides, so that the space of the sky between part 92 and 23 to be provided.For part 92 is soldered to part 23, laser beam F L is passed part 92 be applied on the fin 231, thereby impel therebetween plastic material fusing, the plastic material that dissolves and flow into subsequently recess 232 and 233 is to avoid the generation of weld period flash.On the plane perpendicular to the direction that applies laser beam F L, the width LFL of laser beam F L is more than or equal to the width of fin 231.
For fear of the reflex of laser beam F L, laser beam F L is directed along the normal direction on surface 922, for example perpendicular to this surface 922.The outside face 2310 that receives the fin 231 of laser beam F L is parallel to surface 922 and is parallel to the surface 921 that also is used for receiving along the laser beam F L of vertical applications direction.
For example, laser beam F L can tilt with respect to the axial AX of the cardinal principle of firing device 1, and described axial AX also is the axial of cap shell 9 and substrate 2 rotations.
In an embodiment, better weld for guaranteeing cap shell and substrate, the plastic material that does not load fiber that cap shell 9 usefulness are determined is made, thereby can transmission laser bundle FL, and substrate 2 is to make with same the first plastic material of cap shell 9, but be mounted with guarantee can not transmission laser bundle FL optical fiber, for example, these fibers are glass fibres of implanting in plastic material.
In the embodiment shown in Fig. 1-6, firing device does not arrange the folder-buckle device of cap shell 9 in substrate 2.
In the embodiment shown in fig. 7, firing device comprises that device 201,202 is used for clip cap shell 9 and substrate 2.For example, toggle clip device 201 is positioned on the inwall 25 of substrate 2, and the toggle clip device 202 that is combined with it is positioned on the part 95 of wall 91 of cap shell, and the part 95 of the wall 91 of described cap shell defines gap 94 and is used for before with laser beam F L welding cap shell 9 and substrate 2 is fixed to one another in place.For example, toggle clip device 201 is formed by ridge, in the embodiment shown in fig. 7, become by peripheral fin, and toggle clip device 202 is formed by recess, receives described ridge, and in the embodiment shown in fig. 7, is formed by peripheral grooves, receives described peripheral fin.Clip is used in location before the welding and allows to have certain slit between cap shell 9 and the substrate 2, thereby makes substrate can be pushed into cap shell 9 when being welded by laser beam F L.
Printed wire 70 is soldered to electrode 4, the 6th, by splashing into brazing cream or the weld nuggets that form at every end 42,62 in advance, then utilize another laser that is oriented to the latter to weld again to realize, power and wavelength that this another laser beam allotment has the metallic material that is suitable for the melting copper paste drops or is pre-formed the metallic material of the weld nugget on every end 42,62.This copper paste drops or preformed weld nugget are conductive material.Compare with those methods that will partly form through remelting furnace, the advantage of the method is not to be higher than 250 ℃ of lower hot pressings with the substrate 2 that plastic material is made.Heating is carried out on electrode 4,6 partly.Therefore the quality that substrate 2 is injected does not descend.
Substrate is to utilize electrode 4,6 secondary injection molding to make.For example, substrate 2 is secondary injection molding on electrode 4,6 striped part 43,63, to obtain preferably mechanical strength.By striped part 43,63 quantity, can electrode 4,6 and substrate 2 between guarantee to seal preferably.To extend between their end 41,42,61,62 and finish along the axle that is parallel to electrode 4,6 direction around the injection of electrode 4,6 material of substrate 2 is to avoid forming foam because vertically injecting.Utilize polypropylene acid resin vacuum-impregnated method in the substrate 2 of secondary injection molding on the electrode 4,6 of complete callable heat, can strengthen described sealing in subordinate phase.
Alternatively, the pipeline 3,5 of making in advance of electrode 4,6 stressed basements 2, electrode 4,6 can comprise the striped part, described striped part will be in the substrate 2 after assembling is finished.
For example, striped part 43,63 is positioned at contiguous downside 21 and/or stretches out from downside 21, as shown in Figure 7 embodiment.
The downside 21 of substrate 2 comprises respectively pipeline 3 against, 5 space 26,27, and/or the upper side 22 of substrate 2 comprises respectively pipeline 3 against, 5 space 221,222, to promote electrode 4,6 to insert mould, described mould forms coupling side 21,22 shape, be used to form substrate 2, and also be 4,6 upward movement for fear of plastic material along electrode.
For example, electrode 4,6 usefulness iron-nickel (Fe-Ni) alloys are made (for example with reference to ALLOY 52) or are used the Fe-Ni-Co alloy that has a better mechanical strength than iron-nickel to make (for example registered trade mark (RTM) KOVAR).Utilize this Fe-Ni-Co alloy, can reduce the generation of electrode 4,6 twistings.In another embodiment, electrode 4,6 is for having the brass (Cu-Zn alloy) than the better mechanical strength of iron-nickel (for example registered trade mark (RTM) ALLOY 52).Utilize this brass alloys, can reduce the generation of electrode 4,6 twistings, can reduce cost of manufacture with Fe-Ni-Co alloy phase ratio simultaneously.
In an embodiment, electrode 4,6 is coated with corrosion-resistant coating with good quality of connection (for example: nickel+gold layer).
In the embodiment shown in fig. 4, the downside 22 of substrate 2 can comprise one or more chambeies 28, described chamber 28 is used for receiving another printed circuit board (PCB), and described printed circuit board (PCB) is provided with rheostat, or is provided with arbitrarily that other is used for preventing the device (not shown) of electrostatic discharge.This prevents that the fender guard of electrostatic discharge is connected to electrode 4,6.For example, chamber 28 arranges away from the space between the electrode 4,6; In Fig. 4, electrode 4,6 is observed with its orientation, and one after another.
In the embodiment shown in fig. 5, provide for the fixing device 100 of firing device 1.For example, the joint of firing device 1 between cap shell 9 and substrate 2 has with respect to the outside face of wall 91 and with respect to the wider peripheral shape 10 of lower surface 29 (for example frusto-conical surface) that is not covered by cap shell 9 of substrate 2.Anchor fitting 100 comprises for the fixing lower protrusion 101 of lower surface 29, and the upper protrusion 102 that is used for supporting outside face 922.Prevent that in this embodiment electrostatic discharge from also can be guaranteed by the electrode 6 of the most close protrusion 101 and the preferential discharge path 103 between the anchor fitting 100, to prevent detonating of pyrotechnical charge 8.This preferential discharge path 101 has than passing discharge path 104 between cap shell 9 and the substrate 2 and the resistance less than the discharge path 105 at the top of passing diapire 91.The frusto-conical on the surface 922 of cap shell 9 and the surface 29 of substrate 2 has the shape of relative tilt, with from the inside of firing device to the outside towards advancing each other, therefore when substrate 2 is supported by device 100 with cap shell 9, strengthen the intensity of cap shell 9 in the substrate 2, for example made lines on surface 922.
Embodiment for the method for making firing device 1 is as follows.
One after the other carry out following steps.
At first step, form assembly, comprise electrode 4,6 basements 2, make described electrode be connected to heat-resistant part 21.
For example, first step comprises following substep:
-in mould, carry out secondary injection molding around electrode 4,6 pairs of substrates 2, obtaining to be inserted with electrode 4,6 and be attached to electrode 4,6 substrate 2,
-distribute with these electrodes 4,6 substrate 2 at rotating disc,
-distribution printed circuit board (PCB) 7 on the upper side 22 (namely in the hole of passing plate 7 78 of electrode, 79 small end 42, a side of 62) of substrate 2,
-respectively hold 42,62 with what the copper paste drops was distributed in electrode,
-utilize the laser beam brazing cream on the melting end 42,62 again with suitable wavelength and power, the brazing cream on melting end 42 and the pad 74 on the one hand, with their welding and be electrically connected on each other, the brazing cream on melting end 62 and the pad 75 on the other hand, so that their are welded and are electrically connected on each other
-the assembly that will make thus is placed on the dish, and every dish can be placed for example 200 assemblies,
-in dissolving tank, use the described dish of Ultrasonic Cleaning, with the remnants of removing brazing cream solder flux,
-81 of coating are deposited on the heat-resistant part 71 of each printed wire 70,
-by described dish is passed furnace dried coating 81, for example under 60 ℃ temperature dry 30 minutes.
Before the first step of making described assembly (substrate 2-electrode 4,6-are soldered to the coating 81 on electrode 4,6 the printed circuit board (PCB) 7-plate 7), among or afterwards, use the second step that is used for preparing cap shell 9.
In second step:
-empty cap shell 9 is distributed on the rotating disc,
-reinforcement pyrotechnical charge 82 is dispensed on the bottom of cap shell 9 subsequently.
After the first and second steps, carry out the third step that is used for assembled cap shell and assembly, as mentioned below.
In third step, place the cap shell 9 that comprises powder charge 82, wherein diapire 91 places the bottom, and gap 94 is upwards directed.
Then, assembly (substrate 2-electrode 4,6-printed circuit board (PCB) 7-coating 81) is reversed and pushes the gap 94 of cap shell 9, is placed on the corresponding part 92 of cap shell 9 with the part 23 with substrate 2.The supporting zone 93 that therefore can get subsequently cap shell 9 is placed on the supporting zone 24 of substrate 2.
Then, carry out welding 11 with laser beam F L, laser beam F L passes part 92 and arrives part 23 to weld them together.Laser beam F L is applied to the whole periphery of cap shell 9 and substrate 2, to limit the airtight sealing inner compartment between cap shell 9 and the substrate 2.
Utilization is welded on the printed wire 70 in the substrate 2 that plastic material makes, electrode 4,6 motions that can break away from assembly manipulation or may occur during temperature traverse.This solution is different from solution of the prior art, and solution of the prior art is directly to be welded on the electrode with electric wire, and the shortcoming of this type of weld line is to be subject to the expansion of plastic material or the extruding of contraction.
The operation of firing device 1 is as follows.
Be connected to electrode 4,6 external circuit for the electric current that is applied to the controlling point combustion, for example as to being arranged at the response of being hit detection of the air bag device on the self-propelled vehicle.
Be supplied to flow through metal bond pad on the pad 74,75 that is arranged on printed wire 70 of electrode 4,6 control electric current, and flow into heat-resistant part 71.
The electric current of the heat-resistant part 71 between the heat-resistant part two ends 72,73 of flowing through utilizes joule effect heating heat-resistant part 71.The coating 8,81 that covers on it is lighted in the heating of heat-resistant part 71.
And subsequently, the coating 8,81 of burning is lighted the pyrotechnical charge 8,82 of reinforcement.Coating 8,81 and strengthen the blowing of top 910 that powder charge 8,82 burning impel the diapire 91 of cap shell 9, to light the pyrotechnical charge in gas generator for example or the little gas generator, the burning of this powder charge discharges gas, for example is airbag inflated or the pre-tightening apparatus that acts on safety strap.
The firing device 1 of making thus is isolated with external environment, in the time of on it is installed in be used to the anchor fitting 100 that little gas generator is installed, it has preferential electrostatic discharging path, and allow the use of low-cost printed wire 70 and light pyrotechnics composition 81 (ZPP for example, zirconium and potassium perchlorate) use, this realizes in heat-resistant part by the deposition aqueous adhesive, such as the aqueous adhesive of describing among the patent application FR-A-2833693.
Strengthening pyrotechnical charge 82 can be THPP or BKNO
3The pyrotechnics composition of class, wherein THPP is titanium hydride and potassium perchlorate, and is boron kentite hydrochlorate powder.
Certainly, part 23,92 composition can with the composition exchange of part 23, described part 23 can the transmission laser bundle, and this laser beam of part 92 not transmissions, utilizes described welding laser beam F L directed in the opposite direction, welding helmet shell 9 and substrate 2 are to each other.
Claims (16)
1. electric pyrotechnics firing device, it comprises:
The cap shell (9) that-electricity consumption insulating plastics material is made,
-at least a the pyrotechnical charge (8) that is in the described cap shell (9),
-printed circuit board (PCB) (7), described printed circuit board (PCB) comprises heat-resistant part, described heat-resistant part turns to pyrotechnical charge (8) lighting described pyrotechnical charge (8),
The-the first and second electrodes (4,6), they are electrically connected on heat-resistant part (71) in order to being from the outside the power supply of described heat-resistant part,
-substrate (2), described substrate electricity consumption insulating plastics material is made, and wherein is inserted with the first and second electrodes (4,6), and it supports described printed circuit board (PCB) (7),
Described cap shell (9) comprises part (92), described part (92) covers and is attached at the appropriate section (23) of described substrate (2), thereby described cap shell (9) limits the compartment that seals with described substrate (2), described compartment comprises described pyrotechnical charge (8) and described printed circuit board (PCB) (7)
It is characterized in that, be selected from described substrate, (2) described part, (23) with described cap shell, (9) described part, (92) first one of in the two is the laser beam that has definite welding wavelength with transmissive not, (FL) plastic material is made, and be selected from described substrate, (2) described part, (23) with described cap shell, (9) described part, (92) second portion one of in the two is with the laser beam that can transmission has definite welding wavelength, (FL) plastic material is made
The described laser beam (FL) that described second portion is set to be had described definite welding wavelength passes through along the direction of the first that crosses, to be formed for that described first and second portion are welded in each other zone (11).
2. electric pyrotechnics firing device according to claim 1 is characterized in that, described second portion is to make with the first definite plastic material that does not load fiber, and described first makes with the described first definite plastic material that loads fiber.
3. electric pyrotechnics firing device according to claim 2 is characterized in that, described first determines that plastic material is polyamide 6 .12, and described fiber is glass fibre.
4. each described electric pyrotechnics firing device in 3 according to claim 1 is characterized in that described first is formed by the described part (23) of described substrate (2), and described second portion is formed by the described part (92) of described cap shell (9).
5. each described electric pyrotechnics firing device in 3 according to claim 1 is characterized in that described first is formed by the described part (92) of described cap shell (9), and described second portion is formed by the described part (23) of described substrate (2).
6. each described electric pyrotechnics firing device in 3 according to claim 1 is characterized in that, described first and second portion definition are used for receiving the plastic material that melts at least in part to form the device (232,233) of welding region (11).
7. electric pyrotechnics firing device according to claim 6, it is characterized in that, before welding, provide at least one fin (231) in selected from described first and second portion (23, a 92) part, described fin (231) cooperates with at least one surface (923) of another part of selecting from described first and second portion (23,92).
8. electric pyrotechnics firing device according to claim 7 is characterized in that, described receiving device (232,233) is adjacent to described fin (231).
9. each described electric pyrotechnics firing device in 3 according to claim 1 is characterized in that, utilizes the copper paste drops by laser welding that described electrode (4,6) is attached and be electrically connected to the printed wire (70) of described plate (7).
10. electric pyrotechnics firing device according to claim 9, it is characterized in that, described pyrotechnical charge (8) comprises the pyrotechnics coating (81) that covers on the described printed circuit board (PCB) (7), described substrate (2) comprises for the side (22) and at least one recess (223) that receive printed circuit board (PCB) (7), described recess (233) is positioned at side (22) and is used for receiving printed circuit board (PCB) (7), be between described printed circuit board (PCB) (7) and the described cap shell, and described recess (233) is used for pyrotechnics coating (81) is fixed on reception side (22).
11. each described electric pyrotechnics firing device in 3 is characterized in that according to claim 1, described electrode (4,6) comprises the striped part (43,63) that is in the substrate (2).
12. electric pyrotechnics firing device according to claim 11, it is characterized in that, described electrode (4,6) stretches out with the second side (22) from first side (21) of substrate (2) respectively, and described substrate (2) is included in the space of the against electrode (4,6) at least one side in the first and second sides (21,22).
13. electric pyrotechnics firing device according to claim 9; it is characterized in that; described electrode (4,6) stretches out from first side (22) of substrate (2) and second side (21) of substrate (2) respectively; the printed circuit board (PCB) (7) that comprises heat-resistant part (71) is supported in first side (22) of described substrate (2); different from the first side (22) is that described substrate (2) comprises that in the second side (21) at least one recess is used for providing at least one guard block that is connected to described electrode (4,6) to prevent electrostatic discharge.
14. a method of making the described electric pyrotechnics firing device of above-mentioned each claim is characterized in that the method may further comprise the steps at least, wherein:
-form assembly, comprise the described substrate (2) that is inserted with the first and second electrodes (4,6), described the first and second electrodes (4,6) are electrically connected to described heat-resistant part (71),
-described pyrotechnical charge (8) is inserted into described cap shell (9) at least in part,
-described assembly (2,4,6,71) is pushed into described cap shell (9), so that described heat-resistant part (71) is in a side of described pyrotechnical charge (8), and the described part (92) of described cap shell (9) is placed the described part (23) of described substrate (2)
-described welding laser beam (FL) with described welding wavelength passes described second portion along the downrange of the first that crosses, and is soldered to each other to carry out first and second portion.
15. the method for the electric pyrotechnics firing device of making according to claim 14, it is characterized in that, the printed wire (70) of described printed circuit board (PCB) (7) correspondingly comprises the first and second electrical connection pads (74,75), described electrical connection pad (74,75) is electrically connected to first and second ends (72,73) of heat-resistant part (71), and the heat resister that comprises appointment in the described electrical connection pad, and in order to be electrically connected described electrode (4,6) to described heat-resistant part (71), need to carry out following substep:
-the first and second electrodes (4,6) are attached to described substrate (2), an end (42,62) of wherein said the first and second electrodes (4,6) passes respectively a side (22) of substrate (2),
-printed circuit board (PCB) (7) is placed the described side (22) of described substrate (2), the described end (42,62) of wherein said the first and second electrodes (4,6) is respectively adjacent to the first and second electrical connection pads (74,75) setting,
-the first and second bronze medal paste drops are deposited on respectively the described end (42,62) of described the first and second electrodes (4,6),
-laser beam is applied to the copper paste drops, on the described end (42,62) and described the first and second electrical connection pads (74,75) that it are melted in respectively described the first and second electrodes (4,6).
16. according to claim 14 with 15 in the method for the electric pyrotechnics firing device of each described manufacturing, it is characterized in that, in order to insert pyrotechnical charge, deposit the pyrotechnics that forms a part of pyrotechnical charge at the heat-resistant part (71) of described assembly and light the viscosity drops (81) of composition, and will strengthen pyrotechnical charge (82) insertion cap shell (9) and form a part of pyrotechnical charge.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0954617 | 2009-07-03 | ||
| FR0954617A FR2947622B1 (en) | 2009-07-03 | 2009-07-03 | ELECTRO-PYROTECHNIC INITIATOR AND METHOD OF MANUFACTURING THE SAME |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101941410A CN101941410A (en) | 2011-01-12 |
| CN101941410B true CN101941410B (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010225011 Expired - Fee Related CN101941410B (en) | 2009-07-03 | 2010-07-05 | Electro-pyrotechnic initiator and manufacturing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101941410B (en) |
| FR (1) | FR2947622B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201700075174A1 (en) * | 2017-07-05 | 2019-01-05 | Davide Brescianini | Cover element for alternator pole. |
| DE102019123755A1 (en) * | 2019-09-05 | 2021-03-11 | Auto-Kabel Management Gmbh | Pyrotechnic squib and method for producing a pyrotechnic squib |
| RU2723364C1 (en) * | 2019-10-31 | 2020-06-10 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом) | Electric detonator manufacturing method |
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|---|---|---|---|---|
| US5099762A (en) * | 1990-12-05 | 1992-03-31 | Special Devices, Incorporated | Electrostatic discharge immune electric initiator |
| US5345872A (en) * | 1993-05-28 | 1994-09-13 | Nippon Koki Co., Ltd. | Igniter |
| FR2796715A1 (en) * | 1999-07-19 | 2001-01-26 | Giat Ind Sa | PYROTECHNIC INITIATOR AND METHOD FOR MOUNTING SUCH AN INITIATOR |
| JP3249170B2 (en) * | 1992-03-12 | 2002-01-21 | 内橋エステック株式会社 | Electric bridge igniter |
| EP1225415A1 (en) * | 1999-10-28 | 2002-07-24 | Daicel Chemical Industries, Ltd. | Electric type initiator and gas generator |
| CN101412389A (en) * | 2005-10-20 | 2009-04-22 | 德尔斐韩国株式会社 | Driver's airbag module assembly structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000014472A1 (en) * | 1998-09-09 | 2000-03-16 | Siemens Aktiengesellschaft | Igniter |
-
2009
- 2009-07-03 FR FR0954617A patent/FR2947622B1/en not_active Expired - Fee Related
-
2010
- 2010-07-05 CN CN 201010225011 patent/CN101941410B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5099762A (en) * | 1990-12-05 | 1992-03-31 | Special Devices, Incorporated | Electrostatic discharge immune electric initiator |
| JP3249170B2 (en) * | 1992-03-12 | 2002-01-21 | 内橋エステック株式会社 | Electric bridge igniter |
| US5345872A (en) * | 1993-05-28 | 1994-09-13 | Nippon Koki Co., Ltd. | Igniter |
| FR2796715A1 (en) * | 1999-07-19 | 2001-01-26 | Giat Ind Sa | PYROTECHNIC INITIATOR AND METHOD FOR MOUNTING SUCH AN INITIATOR |
| EP1225415A1 (en) * | 1999-10-28 | 2002-07-24 | Daicel Chemical Industries, Ltd. | Electric type initiator and gas generator |
| CN101412389A (en) * | 2005-10-20 | 2009-04-22 | 德尔斐韩国株式会社 | Driver's airbag module assembly structure |
Non-Patent Citations (1)
| Title |
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| JP特许第3249170B2 2002.01.21 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101941410A (en) | 2011-01-12 |
| FR2947622B1 (en) | 2011-08-05 |
| FR2947622A1 (en) | 2011-01-07 |
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