Patent Publication Number: US-7717041-B2

Title: Device for generating pyrotechnic effects

Description:
BACKGROUND OF THE INVENTION 
   1. Technical Field 
   The invention relates to a device for generating pyrotechnic with preferably a plurality of pyrotechnic charges and igniter means which are housed in a common enveloping body, and with a plurality of pyrotechnic charges and igniter means assigned to the pyrotechnic charges. 
   2. Prior Art 
   Pyrotechnic effects are employed for training purposes in civil defense and military exercises. When used inside buildings, for example in MOUT exercises, the pyrotechnic effects are generated by minute quantities of pyrotechnic effect charges. 
   Prior art devices of this type are known in which the effect charges for generating the pyrotechnic effects are housed in an enveloping body configured in the shape of tube or sleeve. The effect charge is ignited by electric igniter pellets. These pellets as well as the placement of the effect charges in the tubular or sleeve-like enveloping body make the production of such known devices very costly and complicated. This is particularly the case if a number of pyrotechnic effects are disposed in the same enveloping body. Here the ignition of the individual effect charges using igniter pellets has proven to be particularly complex. 
   The object of the invention is to provide a device for generating pyrotechnic effects that is simple to manufacture, in particular if it has a large number of pyrotechnic effects, while ensuring a high degree of reliability in its operation. 
   BRIEF SUMMARY OF THE INVENTION 
   A device for achieving this object is a device for generating pyrotechnic effects with preferably a plurality of pyrotechnic charges and igniter means which are housed in a common enveloping body, characterized in that the enveloping body is formed from a plurality of layers disposed one above the other and connected to each other. Since the enveloping body is made of at least two interconnected layers which lie on top of one another, it is very simple to produce. It is also just as simple to arrange the at least one pyrotechnic charge and the associated igniter means between the layers. It is also conceivable to connected the igniter means with a layer, thus completely eliminating the separate assembly of the igniter means as required in the known devices of this kind. Preferably the individual layers are configured at least in part as a flat surface. The layers can be manufactured quite easily from film, material webs and/or panels. Here the individual layers preferably have approximately the same surface area. If necessary, the layers made of film, webs or panels can first be connected to each other and then punched out together in a single operation to achieve their intended size. 
   At least one layer is made from a relatively stable material which, although it can exhibit some degree of elasticity, provides the enveloping body with a plate-like shape in the style of a credit card or bank card. Such a layer is preferably made of a thin plate which at least in part consists of an insulating material, such as plastic. The plate can also be multi-layer in design through lamination. All other layers can be formed from a thin foil or web. These layers, which themselves do not require any load-bearing properties and are therefore slack, can also assume a form similar to a painted coating or be formed from a paint. 
   Pursuant to a preferred embodiment of the device, one layer is associated with at least the igniter means. The igniter means and preferably also the conductor paths and contacts leading to the igniter means are disposed preferably on one side of the layer in that they are applied to the top and bottom side by adhesive means, metallization, or the like. But it is also conceivable to arrange the igniter means in the interior of the layer. The igniter means are therefore formed right at the start of the production of this layer and do not have to be mounted later—since according to the invention they are integrated in the layer. 
   Also provided in the region of a respective igniter means is at least one opening or free space in the layer bearing this igniter means. The at least one opening makes the igniter means accessible to an igniter charge or directly to the pyrotechnic charge, namely the effect charge. In the process, the respective opening can at the same time serve to accommodate at least in part the igniter charge and/or the effect charge. If necessary, an opening is sufficient to accommodate the entire pyrotechnic charge of an effect if the device is employed inside buildings for simulation or training exercises because only minute quantities of pyrotechnics are necessary for this purpose. In addition, the receiving space for the pyrotechnics can be accorded an appropriate size by making the layer thicker than necessary and/or in that the opening has a surface area which not only extends over the entire area of the igniter means but, if necessary, has an even larger area. 
   Provided in another preferred embodiment of the device is that at least one cavity or a recess for receiving the respective pyrotechnic charge, in particular the effect charge, is arranged in at least one layer. This cavity or recess is configured such that sufficient space remains for receiving the pyrotechnics, namely the respective effect charge. The recess or the like then does not need to have any appreciable volume for accommodating the pyrotechnic charge in the layer bearing the at least one igniter means. In case larger amounts of pyrotechnics are required to form a set of effects, it is also conceivable that the at least one recess in the layer bearing the respective igniter means has a larger volume so that the recess and its associated cavity in the other layer has a receiving capacity for larger effect charges. 
   The cavity for accommodating at least a part of the pyrotechnics of each charge, preferably the entire pyrotechnic charge for an effect, can be created by a convexity or bulge in the layer having the respective cavity. This layer, in contrast to the other layers, is not configured as an even surface but is raised in the region of the cavities. For reasons of expediency, this is an outer layer at the top or bottom. These bulges or convexities make it possible to form cavities having the required volume. To this end, it is possible if necessary to achieve in particular a depth of the respective convexity or bulge which is a multiple of the thickness of the respective layer. 
   In the preferred embodiments of the device, the partially bulged or otherwise structured layer for forming the cavities has at least one predetermined breaking point. The predetermined breaking point is located in a region of each cavity such that when the effect charge is ignited, the layer in the region of the effect charge can tear open in a targeted fashion, i.e. that the outer layer, as controlled by the predetermined breaking point, easily opens in the region of the cavity that has the respective effect charge. Thus, when a pyrotechnic charge is ignited, this arrangement reliably ensures that only the cavity with the ignited charge opens, but with the device remaining otherwise intact. This is especially important when the device has a plurality of pyrotechnic charges which are usually ignited in sequence. In this case, the ignition of one pyrotechnic charge should not affect the other pyrotechnic charges. This requirement is fulfilled by the predetermined breaking point assigned to the cavity of each pyrotechnic charge. In addition, the predetermined breaking point ensures that the parts of the bursting layer surrounding the cavity do not peel away from the enveloping body. 
   The enveloping body preferably has three layers, specifically a supporting, stable carrier layer, a circuit, or conductor, layer and a cover layer. The circuit layer and the top layer themselves do not require any supporting or load-bearing properties. In particular the top layer can be a thin insulating film or even merely a coating of paint. The electroconductive circuit layer is then at least partially embedded between the carrier layer, which is at least partially insulating, and the top layer, which is formed by, for example, paint or a foil. This cover layer preferably has cutouts in the region of the igniter means so that the igniter means are left open by the cover layer. This makes it possible to apply the pyrotechnic charges directly to the igniter means in either a dry and/or liquid form. The pyrotechnic charges are then covered by a separate cover coat or an adhesive. Such devices are particularly simple to construct. However, the cover layer of paint above the circuit layer can also be formed by a thicker carrier layer which has openings in the areas of the igniter means. This creates cavities in the thicker, plate-like cover layer which are capable of accommodating a larger quantity of pyrotechnic material or even a powder-like pyrotechnic charge. The cavities are sealed by a closing cover foil. But it is also conceivable to replace the cover layer with a convexity for the respective thin blister layer having the respective pyrotechnic charge. 
   In a preferred embodiment of the device, the preferred breaking point is formed by intersecting weakening lines which preferably extend only across the area of the respective convexity for forming at least one part of a cavity. The intersecting weakened lines can extend across the entire region of the cavity or merely across part of the cavity. 
   Pursuant to a preferred embodiment of the invention, an exposed outer area of an outer layer is assigned contacts which are freely accessible from the outside. The contacts are preferably specifically associated with the igniter means, namely connected to them in an electroconductive manner. This makes it easy to create an electroconducting connection between an appropriate firing apparatus and the respective igniter means. The device, which is manufactured on the basis of the invention&#39;s formation of interconnected layers, assumes the shape of a credit card or bank card, whereby it merely needs to be inserted into the firing apparatus in order to create the designated connection via the contacts with the respective igniter means. 
   Also provided by the invention is that device has at least one data storage means, in particular a chip. This makes it possible to assign specific values to the pyrotechnic charges, in particular in the form of data which, for example, can supply the firing apparatus with information necessary for the targeted ignition or the selective firing of the individual pyrotechnic charges of the respective device. Thus it is possible to operate different devices with the same firing apparatus, with the latter constantly being provided with individual data necessary for the selective triggering of the pyrotechnic charges, in particular the effect charges. 
   A further device for achieving the object set forth in the introduction, which can also be a preferred further development of the previously described device, is a device for generating pyrotechnic effects with a plurality of pyrotechnic charges and igniter means assigned to the pyrotechnic charges, characterized in that at least some igniter means are configured as heating resistors. Accordingly, at least one firing means is configured as a heating resistor. If the device has a plurality of pyrotechnic charges, preferably every pyrotechnic charge is assigned an igniter means configured as a heating resistor. However, it is also possible to assign different pyrotechnic charges to different igniter means, of which some are configured as heating resistor, with the others being conventional igniter means, such as electric igniter pellets. The igniter means can be made particularly easily with the heating resistor. In the simplest case, this involves a short section of a conductor path which then forms a heating resistor. 
   The or each heating resistor is preferably configured in a meandering fashion. This is a simple or complex winding pattern of fairly thin conductor paths which warm upon the slightest application of electricity and in extreme cases can be brought to a glow. This can result in the destruction of the heating resistor because each heating resistor is used only for the single ignition of an effect charge or an igniter charge since the device according to the invention is designed only for one-time use. The meandering heating resistor is sufficiently long, in particular when it is brought to a glow, to develop enough thermal energy to ignite the igniter charge or the effect charge. 
   It is also provided that the heating resistors or, if applicable, only a single heating resistor, are configured as part of a flexible or rigid circuit board. The heating resistors are then practically integrated in the circuit board, with the result that the meandering heating elements are immediately provided with their electric leads. In order that only the heating elements are targeted to warm up or glow for the controlled ignition of the pyrotechnical lead, they have a smaller cross section than the electric leads. Since the overall thickness of the circuit board is the same, i.e. the circuit board is just as thick in the regions of the meandering heating elements and the electric leads, the difference in the cross-section of the electric leads and the meandering heating elements is achieved by configuring the electric leads with a greater width than the meandering heating elements. 
   The circuit board with the meandering heating resistors is either attached to a surface of the layer bearing the circuit board or the circuit board is provided on both sides with a plastic laminated layer. In the latter case, the circuit board with the meandering heating resistors is embedded between the two plastic laminated layers, which in the former case the circuit board is lies exposed on a top surface. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The preferred embodiments of the devices will be described in more detail in the following by means of the drawing, which shows: 
       FIG. 1  shows a top side of the device in perspective view. 
       FIG. 2  shows a view of the bottom side of the device. 
       FIG. 3  shows a partial sectional view III-III through the device. 
       FIG. 4  shows an enlarged detail IV from the view of  FIG. 3 . 
       FIG. 5  shows a top view of a circuit board of the device. 
       FIG. 6  shows a second exemplary embodiment of the device in a view analogous to  FIG. 4 . 
       FIG. 7  shows a top view of a device pursuant to a third exemplary embodiment of the invention. 
       FIG. 8  shows a top view of the exposed conductor paths and igniter means on a circuit board of the device pursuant to  FIG. 7 . 
       FIG. 9  shows an enlarged representation of the partial sectional view through a pyrotechnic charge of the device pursuant to  FIGS. 8 and 9 . 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The devices shown in the figures are employed for training purposes in civil defense and military exercises, particularly in the interior of buildings when, for example, soldiers or police officers carry out realistic simulations of house-to-house combat or the storming of a building. Here the device is employed to generate the pyrotechnic simulation of gunfire, explosions or even stun grenades. But the possible uses of the device according to the invention is not limited to these example but can also be employed for other common simulations. 
   The shown device generates acoustic and/or optic simulations by means of igniting pyrotechnic charges. The devices shown in the figures have a plurality of pyrotechnic charges. The number of pyrotechnic charges in each device can vary according to the type of simulation. It is also conceivable that the device has only a single pyrotechnic charge and is thus employed only for the simulation of a single explosion or the like. 
   All devices according to the invention are characterized in that they have an essentially plate-like configuration. Preferably the devices assume a format corresponding to that of a credit card or bank card. Accordingly, the pyrotechnic charges and everything needed for their selective ignition is housed in a flat, plate-like enveloping body or assigned to same. 
     FIGS. 1 to 5  show a first exemplary embodiment of the device according to the invention. This device has fourteen pyrotechnic charges  10 . The charges  10  are distributed in grid-like pattern on the surface of a plate-like enveloping body  11  of the device. However, any other arbitrary number of pyrotechnic charges  10  per device is also conceivable. The pyrotechnic charges  10  can be employed to generate the same pyrotechnic effects as well as different effects. In the following description, it will be assumed that all fourteen pyrotechnic charges generate the same effect, such as an explosion used to simulate the detonation of a hand grenade. 
   All fourteen pyrotechnic charges  10  are housed in the same plate-like enveloping body  11 . But also disposed in the enveloping body  11  are igniter means  12 , again preferably the same igniter means  12 , so that each pyrotechnic charge  10  is associated with its igniter means  12 . The igniter means  12  either ignite their associated pyrotechnical charges  10  directly or are assigned to priming charges (not shown in the figures), so that the igniter means  12  ignite the priming charges, which in turn ignite the pyrotechnic charges  10 . Furthermore, the enveloping body  11  also contains conductors paths  13 , which connect the igniter means  12  to contacts  14  which can be electrically connected to the corresponding contacts of a conventional firing apparatus (not shown), which, if necessary, also serves simultaneously as a control device. 
   The enveloping body  11 , whose base area is approximately that of a credit card or bank card, comprises a plurality of layers. The individual layers have the same area and are connected to each other by sealing and/or adhesive bonding. The device shown here ( FIGS. 3 and 4 ) has two layers of which a lower layer is configured as a multi-ply layer. The single-ply upper layer is a relatively stable carrier layer  15 . Below that, the second layer in the shown exemplary embodiment is formed from interconnected sub-layers, specifically an upper laminate layer  16 , a circuit layer  17  and a bottom laminate layer  18 . In this case, therefore, the circuit layer  17  is completely embedded between the top laminate layer  16  and the bottom laminate layer  18 . The carrier layer  15  and the laminate layers  16  and  18  are made of synthetic material, preferably a thermoplastic. The layers are preferably punched out of a continuous plastic web or film. The thickness of the layers shown in the figures is not drawn to scale in order to better illustrate the individual layers or sub-layers. In fact, at least some layers are much more thinner, in particular the individual sub-layers, such as the top laminate layer  16  and the bottom laminate layer  18 . The same holds true for the circuit layer  17 . In practice, the carrier layer  15  will therefore have a greater thickness than the underlying layer comprising the two laminate layers  16  and  18  and the circuit layer  17 . In particular the top laminate layer  16  and the bottom laminate layer  18  can be made from a relatively thin plastic film having a thickness well under 1 mm, in particular in the range of 1/10 to 1/100 mm. 
   All layers or sub-layers are connected to each other, to a large degree across their entire surface area. This connection can be made by adhesive bonding, sealing or the like. 
     FIG. 5  shows a top view of the circuit layer  17 . It has a thin, electrically insulating carrier layer on which the conductor paths  13 , contacts  14  and igniter means  12  are arranged as shown in  FIG. 5 . It is also possible to apply, preferably vaporize, the igniter means  12 , conductor paths  13  and contacts  14  directly to the laminate layer  16  or  18 , in particular the bottom laminate layer  18 . The separate carrier film (not shown in the figures) of the circuit layer  17  can then be omitted. The fourteen igniter means  12  in the shown exemplary embodiment are placed on the circuit layer  17  where the pyrotechnic charges  10  are also located. The grid pattern of the igniter means  12  thus corresponds to the grid pattern of the pyrotechnic charges  10 . 
   In a manner special to the invention, the identical igniter means  12  in the shown exemplary embodiment are designed as heating resistors. In the preferred exemplary embodiment of the invention, the heating resistors have a meandering design, thus exhibiting—in a top view—a winding path. The opposite ends of the meandering heating resistors for forming the igniter means  12  are each connected to a conductor path  13 . The two conductor paths  13  assigned to each igniter means  12  are led to contacts  14  lying adjacent to one another. All contacts  14  are arranged in two parallel rows in the vicinity of a long edge of the circuit layer  17 , specifically running parallel at different distances from the longitudinal edge in question. The meandering heating resistors which lie the closest to the contacts  14  have a greater number of densely adjacent conductor branches than the meandering heating resistors more distant from the contacts  14 . The thickness of the conductor paths  13  and the contacts  14  is approximately the same. But in their width, the heating resistors are significantly smaller compared to the conductor paths  13  and the contacts  14 . The meandering heating resistors thus have a smaller conductor cross-section, particularly with respect the conductor paths  13 . As a result, the meandering heating resistors forming the igniter means  12  in the regions of the pyrotechnic charges  10 , but not the conductor paths or the contacts  14 , are heated to a glow by electric current supplied through the conductor paths  13 . Due to the heating of the igniter means  12 , the pyrotechnic chargers  10  or, if present, the igniter priming charges upstream of them, are thermally ignited. 
   In the exemplary embodiment of  FIGS. 1 to 5 , where the circuit layer  17  with the igniter means  12  formed by the meandering heating resistors is embedded between laminate layers  16  and  18 , the top laminate layer  16  facing the cover layer  15  is provided with openings  21  in the region of the igniter means  12 . Each opening  21  in the top laminate layer  16  extends across the region of the meandering heating resistor forming the igniter means  12  ( FIG. 4 ). Consequently, the heating resistor forming the igniter means  12  is exposed to the outer carrier layer  15 . 
   At the point where the respective opening  21  and the igniter means  12  formed by the meandering heating resistor are located, the top (outer) carrier layer  15  has a convexity  22  projecting outwards. Thus, the carrier layer  15  is provided with a number of convexities  22  corresponding to the number of pyrotechnic charges  10 . In the device shown here, there are thus fourteen convexities  22  present. All convexities  22  in the shown exemplary embodiment have the same design. But they can also have different sizes. Due to the convexities  22 , the top side of the plate-like device is raised in certain areas, namely it is provided with projections ( FIG. 1 ). In contrast, the opposite underside of the plate-like device is flat because only the carrier layer  15  is provided with local convexities  22  in the region of the pyrotechnic charges  10 , but not the underlying layer comprising the laminate layers  16  and  18  and the interjacent circuit layer  17 . 
   Formed in the region of each convexity  22  in the device is a cavity  23  between the carrier layer  16  and the igniter means  12  of the circuit layer  17 . This cavity  23  is largely created by the convexity  22  of the carrier layer  15 , but also in part by the opening  21  in the top laminate layer  16  above the circuit layer  17 . Each cavity  23  serves to accommodate the pyrotechnic charge  10 , namely the effect charge. The cavity  23  is dimensioned such that a required quantity of pyrotechnic mass can be accommodated within it. For example, the amount of pyrotechnic mass for each pyrotechnic charge  10  is between 0.1 g and 0.2 g. This small amount of pyrotechnic charge  10  is sufficient for indoor simulations. But it is also conceivable that, for other purposes, particularly those involving larger devices, the cavities  23  can be sized larger in order to accommodate larger pyrotechnic charges  10 . If necessary, a pyrotechnic priming charge can also be disposed in the cavity  23  if the pyrotechnic effect charge cannot or should not be directly ignited by the igniter means  12  configured as a heating resistor. In that case, the pyrotechnic priming charge is located between the pyrotechnic effect charge  10  and the exposed thin heating conductors for forming the heating resistor of the igniter means  12 . 
   The carrier layer  15  is provided with a predetermined breaking point in the region of each convexity  22 . The predetermined breaking point results in a targeted, local weakening of the wall thickness of the carrier layer  15  in the region of each convexity  22 . In the shown exemplary embodiment, each predetermined breaking point is formed by two weakening lines  24  which intersect at right angles ( FIG. 1 ). In the region of each weakening line  24  the wall thickness of the carrier layer  15  is reduced by a sharp-edged indentation, preferably one having a V-shaped cross-section, on at least one side of the carrier layer  15 . In  FIG. 4  the carrier layer  15  has single-side, outer weakening lines  24  in the region of each convexity  22 . But it is also conceivable to provide the weakening lines  24  only on the inner side of the carrier layer  15  or on both sides of the same, i.e. lying opposite one another. The two weakening lines  24  cross each other approximately in the middle of each convexity  22 . The predetermined breaking point created by the weakening lines  24  brings about a controlled bursting of the carrier layer  15  only in the region of the convexity  22  when the pyrotechnic charge  10  is ignited. By limiting the weakening line  24  to the region of the respective convexity  22 , the bursting of each cavity  23  is limited to the region of the respective convexity  22  for a pyrotechnic charge  10 . This therefore prevents the entire device from bursting or tearing open when a pyrotechnic charge  10  is ignited and thus avoids any undesirable affect on the pyrotechnic charges  10  that have not yet been ignited. The predetermined breaking point can be omitted in a device having only one pyrotechnic charge  10 , since no controlled bursting of the carrier layer  15  is required in a device which is “spent” as soon as its only pyrotechnic charge  10  has been fired. 
   In a variation of the exemplary embodiment shown in  FIGS. 1 to 4 , it is conceivable to provide the circuit layer  17  with a laminate layer on only one side. In that case, preferably only a bottom laminate layer  18  is present, meaning that the top laminate layer  16  is lacking. Here it is also no longer necessary to provide openings  21  in the regions of the igniter means  12  because the latter are already exposed on this side of the carrier layer  15  anyway. The conductor paths  13  leading to the igniter means  12  are then covered and insulated by the carrier layer  15 , with the result that, outside of the regions of the pyrotechnic charges  10 , the circuit layer  17  is embedded between the plastic carrier layer  15  and the bottom laminate layer  18 . 
     FIG. 6  shows a detail from  FIG. 4  in the region of a sectional view through a pyrotechnic charge  10  as can be provided in a device according to the second exemplary embodiment of the invention. In this case, two layers are also provided. In principle, the bottom layer can be configured like the bottom layer of the first exemplary embodiment of the device. Consequently, the same reference numbers will also be used to designate the same parts. 
   This bottom layer has a triple-ply configuration, comprising namely a top laminate layer  16 , a bottom laminate layer  18  and an interjacent circuit layer  17 . Here, too, the respective igniter means  12  is formed by a meandering heating resistor. The top laminate  16  has an opening  21  in the region of the respective igniter means  12 . In contrast to the first exemplary embodiment of the invention ( FIG. 4 ) the top laminate layer  16  is significantly thicker than the bottom laminate layer  18 . The opening  21  over each igniter means  12  itself forms the cavity  23  for accommodating the pyrotechnic charge and, if necessary, a pyrotechnic priming charge. Due to the greater thickness of the top laminate layer  16 , it serves as a carrier layer. The second layer, in contrast to the first exemplary embodiment, is then no longer designed as a carrier layer but serves as a cover layer  25 . The cover layer  25 , which may have relatively thin walls, can be most easily formed from a smooth film. By housing the pyrotechnic charge  10  in the device of  FIG. 6  in the region of the thicker, top laminate layer  16 , it is not necessary to provide the top side of the enveloping body  11  with convexities  22 . For that reason, in the shown exemplary embodiment the enveloping body is completely flat in design on both sides, thus being indistinguishable from a credit card or bank card in its exterior view. The thin cover layer  25  tears open automatically when the pyrotechnic charge  10  is ignited and therefore requires no predetermined breaking point. 
   The flat bottom side of the device shown in  FIG. 2  has cutouts  19  in the region of the contacts  14  of the circuit layer  17 . The cutouts  19  are placed where the contacts  14  of the conductor paths  13  are located. This arrangement provides free access to the contacts  20  through the cutouts  19  in the lower laminate layer  18  for the corresponding contacts of the firing apparatus for igniting the individual pyrotechnic charges  10  of the device ( FIG. 2 ). 
   Furthermore, the bottom side of the device has a data storage unit, which in the shown exemplary embodiment is designed in the manner of a chip  20  commonly found in credit cards or bank cards ( FIG. 2 ). The chip  20  can be used to store data relevant to the device, in particular data concerning the number and type of the pyrotechnic charges  10  disposed in the enveloping body  11 . When the device is inserted in the appropriate firing apparatus, the latter reads the data from the chip  20 , thereby obtaining the necessary information, in particular the number of pyrotechnic charges  10  and their type. Thus it is possible for the firing apparatus to ignite the respective pyrotechnic charge  10  in a selected manner. In addition, the chip  20  also provides the firing apparatus  20  with information about which pyrotechnic charges  10  of the device have already been spent. 
     FIGS. 7 to 9  show a third exemplary embodiment of the device according to the invention. This device has only eleven pyrotechnic charges  26 . The pyrotechnic charges  26  are distributed on the surface of the device&#39;s plate-like enveloping body  27  in a grid pattern. However, any arbitrary number of pyrotechnic charges  26  is also conceivable in this exemplary embodiment as well. The pyrotechnic charges  26  can serve to generate identical pyrotechnic effects or different pyrotechnic effects. In the following description, it will be assumed that all pyrotechnic charges  26  generate the same effect, for example an explosion. 
   In the shown exemplary embodiment, the plate-like enveloping body  27 , to which the eleven pyrotechnic charges  26  are assigned, is also configured with the shape and area approximating that of a credit card or bank card. In contrast to the two previously described exemplary embodiments, the shown enveloping body  27  has three layers, or a three-ply layer. Located on a bottom, if necessary laminated, carrier layer  28  is a circuit layer  29  and a cover layer  30  above it. The carrier layer  28  is designed to provide stability to the enveloping body  27 . 
   The circuit layer  29 , which is configured in the manner of a printed circuit board for example, has conductor paths  31 , igniter means  32  and contacts  33  ( FIG. 8 ). 
   Each pyrotechnic charge  26  is assigned an igniter means  32 , meaning that the circuit layer  29  of the device shown here has eleven igniter means  32 . As in the previously described exemplary embodiments, the igniter means  32  are similarly configured as heating resistors. The heating resistors (pursuant to the top view of  FIG. 8 ) run in a winding or meandering path. Opposite ends of each igniter means  32  are each connected to a conductor path  31  which leads to contacts  33 . In the shown exemplary embodiment each conductor path  31 , for safety reasons, has three contacts  33 , it being possible to vary the number of contacts  33  per conductor path  31  as desired. The conductor paths  31 , igniter means  32  and contacts  33  are usually vaporized onto the carrier layer  28 , which is made of an insulating material, such as plastic or a laminate comprising a plurality of layers and having at least one insulating layer. The circuit layer  29  and the carrier layer  28  thus form a unit. 
   The circuit layer  29  is provided on the top side opposite the carrier layer  28  with the cover layer  30 . In the shown exemplary embodiment the cover layer  30  is formed merely by a cover coat (referred to by specialists as a “solder resist”). The regions of the igniter means  32  however are left free of solder resist used to form the cover layer  30 . These regions are preferably circular areas, and are illustrated as hatchings in  FIG. 7 . Furthermore, the contacts  33  are largely left uncovered by the cover layer  30 . Otherwise, the cover layer  30  completely covers the circuit layer  29 . The cover layer  30  thus forms the third layer of the device&#39;s enveloping body  27  which is located on the side of the circuit layer  29  opposite the carrier layer  28 . Instead of the cover layer  30 , it is possible to apply a thick, stable cover layer to the circuit layer  29 , with the result that the device is made of two carrier layers and the interjacent circuit layer  29 . 
   Each of the areas of the igniter means  32  left exposed by the cover layer  30  is associated with a pyrotechnic charge  26 . Each pyrotechnic charge  26  is applied in a liquid state to the igniter means  32 , for example by being dabbed or blotted on. After the pyrotechnic charge  26  has dried, it is covered by an elastic cover coat  34 , which can also be a glue dot. The cover coat  34  or glue dot bonds with the cover layer  30  in a liquid-tight seal, with the result that the cover layer  30  together with the point-like positions of the cover coat  34  over each pyrotechnic charge  26  form a continuously closed covering of the top side of the circuit layer  29 . Only the contacts  33  remain exposed, i.e. are not covered by the top side of the circuit layer  29 . 
   In the device shown in  FIGS. 7 to 9 , all contacts  33  are assigned to a narrow transverse edge area of the enveloping body  27 . The contacts  33  lie adjacent to one another on a contact strip  35  which proceeds from a transverse edge area. Here all contacts  33  are exposed on the top side of the carrier layer  28 , making it therefore possible for them to come into contact on this side with a firing apparatus. Located between two groups of contacts  33  in the contact strip  35  is a slit  36  open at the transverse edge. This slit  36  serves as an indicator for the firing apparatus that a device has been inserted in it and what kind of device is involved, in particular with respect to the number of pyrotechnic charges  26  contained in the device and the type of pyrotechnic charges  26  that are present. 
   Furthermore, the enveloping body  27  of the device shown here has notches  37  and cutouts  38  at opposite longitudinal edges. In the shown exemplary embodiment, these are two identical slot-like notches  37  on opposite longitudinal edges and two opposite identical rectangular cutouts  38  at opposing corner regions of the enveloping body  27 . The notches  37  accommodate ejectors of the firing apparatus which can push the device out of the firing apparatus. The cutouts  38  serve to center the device in order that the contacts  33  properly fit into the provided contact positions of the firing apparatus. 
   The elastic cover coat  34  for covering the pyrotechnic charges  26  rips apart upon ignition of the pyrotechnic charges  26 . This means that the pyrotechnic charges  26  can be discharged without having the cover coat  34  or the glue dots separate from the enveloping body  27 , in particular from the carrier layer  28 . This prevents any fragments of the enveloping body  27 , in particular of the cover coat  34  or glue dots, from dislodging and scattering in an uncontrolled manner when the respective pyrotechnic charge  26  is ignited. 
   A variation of the device not shown in the drawing pursuant to  FIG. 7 to 9  has an additional layer, namely a blister layer with convexities at the position of the pyrotechnic charges.  26 . The blister layer can be made from thin plastic film or aluminum. A powdered pyrotechnic charge or a powder/liquid mixture of the pyrotechnic charge  26  can be put in the cup-shaped convexities which are each assigned to the respective igniter means  32 . After the convexities assigned to the respective pyrotechnic charges  26  have been filled with the pyrotechnic charge  26 , the blister layer is joined with the cover layer  30 , specifically by adhesive bonding, sealing or the like. In the process, the pyrotechnic charges  26  arranged in the convexities of the blister layer assume a position directly above the igniter means  32 , which are exposed in part by the cover layer  30 . The device previously described thus has, in addition to the device of  FIGS. 7 to 9 , a further layer, namely the blister layer. But it is also conceivable that the cover layer  30  is omitted entirely in this device in that the conductor path  31  and contacts  33  of the circuit layers  29  are covered by the blister layer preferably comprising an insulating material such as plastic film. The convexities for accommodating the pyrotechnic charges  26  can be provided with weakening lines  24  in the manner of the convexities  22  of the first exemplary embodiment (see  FIG. 1 ). 
   Alternative devices are also conceivable which are built as a combination of the individual layers of the previously described devices. For example, a device is conceivable in which a top laminate layer  16  with openings  21  for receiving the pyrotechnic charges  10  above the igniter means  16  as well as a cover layer  25  are arranged on the carrier layer  28  with the circuit layer  29  and, if applicable, on the cover layer  30 , pursuant to the exemplary embodiments of  FIG. 4  or  6 . 
   LIST OF DESIGNATIONS 
   
       
         10  pyrotechnic charge 
         11  enveloping body 
         12  igniter means 
         13  conductor path 
         14  contact 
         15  carrier layer 
         16  top laminate layer 
         17  circuit layer 
         18  bottom laminate layer 
         19  cutout 
         20  chip 
         21  opening 
         22  convexity 
         23  cavity 
         24  weakening line 
         25  cover layer 
         26  pyrotechnic charge 
         27  enveloping body 
         28  carrier layer 
         29  circuit layer 
         30  cover layer 
         31  conductor path 
         32  detonating agent 
         33  contact 
         34  cover coat 
         35  contact strip 
         36  slit 
         37  notch 
         38  cutout