Abstract:
A can includes an at least partially electrically conductive body having a seal region delimited by a predetermined breaking edge on a front wall. An opening element bears against the front wall and is connected to the front wall at least at one point in an initial position. When the opening element is pivoted into an opening position, the seal region tears away at the predetermined breaking edge and forms an opening for emptying the contents of the can. The opening element has a metallic basic body which has a loop with an electrical interruption at one end region. An antenna and a transponder chip which is connected to the antenna are provided. The antenna bears at least partially against and is electrically insulated from the basic body. The antenna is free of interruptions, at least partially along the loop which is electrically interrupted by the interruption.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention relates to a can including an at least partly electrically conductive body, in particular made of aluminum, wherein on a front wall of the can a seal region has been at least partly delimited by a predetermined breaking edge, and wherein the can has an opening element, wherein the opening element in its initial position at least partly bears flat against the front wall of the can and has been connected to the front wall at least at one point. When the opening element is pivoted with respect to the can from the initial position into an opening position the seal region breaks away from the predetermined breaking edge, and in the intermediate region delimited by the predetermined breaking edge an opening is formed for discharging the contents of the can. 
     From the prior art a large number of beverage cans are known that may be opened by means of a one-time seal, whereby in each instance a seal region is broken out of the body of the can upon opening, so that the contents of the can may be discharged therefrom. 
     From the prior art it is also possible to arrange RFID/NFC antennas and RFID/NFC transponders on objects, in particular also on cans, in order by means of an external data communication device to transmit data that have been stored in the transponder to the external communication device, or to transmit data from the communication device to the transponder and to store said data in the transponder. 
     However, no possibility is known from the prior art so that data are transmissible from a beverage can to an external data communication device exclusively when a one-time seal on the can has been opened. Such an apparatus could be used, for example, to make certain information stored in the transponder accessible only to the person who purchased the respective can. Typically, such a can may be employed advantageously for competitions in which it is required that the respective participant bought or opened the can. 
     BRIEF SUMMARY OF THE INVENTION 
     It is consequently an object of the invention to make available a can with which data are transmissible from a transponder arranged on the can to an external data communication device only when the respective can has been opened and/or, with an external data communication device on a transponder arranged on the can, data may be stored only when the respective can has been opened. 
     The invention achieves this object with the can of the aforementioned type including an at least partly electrically conductive body, in particular made of aluminum, wherein on a front wall of the can a seal region has been at least partly delimited by a predetermined breaking edge, and wherein the can exhibits an opening element, wherein said opening element in its initial position at least partly bears flat against the front wall of the can and has been connected to the front wall at one point at least, wherein when the opening element is pivoted with respect to the can from the initial position into an opening position the seal region breaks away from the predetermined breaking edge, and in the intermediate region delimited by the predetermined breaking edge an opening for discharging the contents of the can is formed, there is provision that the opening element exhibits a metallic basic body which exhibits at an end region a loop with an electrical interruption, that an antenna and a transponder chip linked to the antenna have been provided, that the antenna at least partly, in particular completely, bears against the basic body and has been electrically isolated with respect to the basic body, and that the antenna has been arranged free from interruption at least partly along the loop electrically interrupted by the interruption. 
     With a can of such a type, a wireless communication between the transponder chip arranged on the opening element of the can and an external data communication device is effectively suppressed by the electromagnetic reaction of the electric currents induced in the metallic front wall of the can on the electromagnetic field of the data communication device, so long as the opening element is located in the initial position and hence the antenna is located in the immediate vicinity of the metallic front wall of the can. 
     In this case it is advantageous that a communication of data between the transponder arranged on the can and an external data communication device is possible only when the can has been opened. This is achieved, in particular, by virtue of the interruption provided in the opening element, since by virtue of this no eddy currents or only insignificant eddy currents, which would impair a communication, are able to be induced in the opening element in the opened state in the region of the antenna. A communication of data is impossible in any case when the opening element is in its initial position and the can has not yet been opened. 
     An advantageous development of the invention, which enables an easy manufacture, provides that the antenna and/or the carrier has/have been arranged on the side of the opening element facing toward the front wall in the initial position. 
     An advantageous suppression of the communication is achieved if the antenna has been routed across the interruption from the one end of the loop of the opening element close to the interruption to the opposite end of the loop of the opening element close to the interruption. 
     In order to effectively avoid a communication between the transponder arranged on the can and an external data communication device so long as the can has not been opened, there may be provision that in the initial position the antenna exhibits a maximum spacing of less than 3 mm, in particular of less than 0.2 mm, from the wall of the can, and/or that the antenna at least partly bears against the can. 
     For the same purpose, alternatively or additionally there may be provision that the antenna has been arranged in such a manner that, in the initial position, electromagnetic fields that are directed toward the antenna are changed by the wall region or surface region of the can in such a manner that the coupling of electromagnetic fields into the antenna is suppressed or sufficiently weakened, so that no communication of data is possible between the transponder arranged on the can and an external data communication device. 
     In order to enable a communication between an external data communication device with the transponder, there may be provision that in the opening position the antenna has been lifted away and/or removed from the conductive wall region and surface region of the can and/or has been pivoted relative to the latter, and that in the opening position the antenna receives electromagnetic fields that are directed toward it in a form and intensity sufficient for wireless communication of data, and relays them to the transponder chip. 
     In order to effectively avoid a shielding or displacement of electromagnetic waves directed toward the antenna in the opening position, there may be provision that at a transmission frequency within the range between 100 kHz and 1000 MHz, in particular within the range from 120 kHz to 135 kHz, within the range from 13 MHz to 14 MHz or within the range from 860 MHz to 910 MHz, the specific electrical conductivity of the carrier material on or in which the antenna has been arranged is less than 1 S/m, and that the electrical permittivity of the carrier material on or in which the antenna has been arranged is less than 100*8.854*10 −12  As/Vm. 
     In order to effectively guarantee a shielding or displacement of electromagnetic waves directed toward the antenna in the initial position, there may be provision that at a transmission frequency within the range between 100 kHz and 1000 MHz, in particular within the range from 120 kHz to 135 kHz, within the range from 13 MHz to 14 MHz or within the range from 860 MHz to 910 MHz, the wall region or surface region of the can against which the opening element bears exhibits a specific electrical conductivity of at least 10 S/m, in particular of at least 10 6  S/m, and exhibits a magnetic permeability of at least 0.99*4*π*10 −7  Vs/Am. 
     An embodiment of the invention that is particularly easy to manufacture provides that the seal region and the predetermined breaking edge have been formed on a front wall of the can. 
     A particularly advantageous arrangement, with which an advantageous pivoting of the opening element is possible, provides that the opening element has been connected to the can via a rivet, the opening element exhibiting a pressure region bearing against the seal region in its initial position, for pressing the seal region inward. 
     In order to open the can easily, in this case there may be provision that the opening element exhibits an actuating region situated opposite the pressure region, in which case the pressure region and the actuating region have been delimited from one another by the rivet and act together as a two-armed lever articulated by the rivet. 
     A particularly simple mechanical configuration, which enables a good pivoting of the opening element with respect to the can, provides that the opening element exhibits a connecting element which is capable of pivoting with respect to its body and which has been connected to the wall of the can by means of the rivet. 
     When using transmission frequencies of 10 MHz to 15 MHz, it is particularly advantageous that the antenna has been arranged in an indentation at least partly along the peripheral edge of the opening element. 
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
     A preferred exemplary embodiment of the invention will be presented in greater detail with reference to the following figures of the drawing. 
    
    
     
         FIG. 1  shows an embodiment of the invention in the initial position. 
         FIG. 2  shows the embodiment of the invention represented in  FIG. 1  in the opening position. 
         FIG. 3  shows an embodiment of an opening element  4  according to the invention.  FIG. 3 a    shows a section extending through the opening element in the embodiment of the invention represented in  FIG. 3 . 
         FIG. 4  shows the composition of the opening element consisting of a basic body and a carrier. 
         FIG. 5  shows the electromagnetic behavior of the can and of the opening element in the initial position. 
         FIG. 6  shows the electromagnetic behavior of the can and of the opening element in the opening position.  FIG. 6A  and  FIG. 6B  show details A and B from  FIG. 6 . 
     
    
    
     DESCRIPTION OF THE INVENTION 
     Represented in  FIG. 1  is a cylindrical can  1  according to a preferred exemplary embodiment of the invention. The body of the can  1  consists, in its entirety, of aluminum, it being possible for the can  1  to exhibit a printed decorative film on its circumferential surface  13 . On the front wall  14  of the can  1  a seal region  2  has been provided which is delimited by a predetermined breaking edge  3 . Furthermore, the can  1  exhibits an opening element  4  which has been connected to the front wall  14  of the can  1  via a rivet  6  penetrating a slot  16  ( FIG. 3 ) of the opening element  4 . In principle, however, it is sufficient that the wall region and surface region  5  of the can  1  that the opening element  4  adjoins brings about a sufficient reaction on an electrostatic field applied from outside in the region of the opening element  4 , so that in the case of an adjacent opening element  4  on the wall region and surface region  5  no wireless electromagnetic transmission of data is possible between an antenna  8  arranged in or on the opening element  4  and an external data communication device ( FIG. 3 ). The opening element  4  is provided with a connecting element  12  with the slot  16 , which is capable of pivoting with respect to its body and which has been connected to the front wall  14  of the can  1  by means of the rivet  6  and which rests flat on the front wall  14  of the can  1 . Ordinarily, the opening element  4  may be rotated about the axis of the rivet  4 ; in the present exemplary embodiment there is no kinetically rigid connection of the opening element  4  to the can. In the present exemplary embodiment, the opening element bears flat against the front wall  14  of the can  1 . 
     In  FIG. 2  the embodiment of the can  1  represented in  FIG. 1  is represented in the opening position. In the process of opening, an actuating region  11  of the opening element  4  facing away from the seal region  2  is raised, and the entire opening element  4  is pivoted with respect to the articulation edge  15  between the connecting element  12  and the body of the opening element  4 . By this means, the pressure region  10  of the opening element  4  bearing against the seal region  2  is pressed in the direction of the seal region  2  into the interior of the can  1 , as a result of which the seal region  2  breaks away from the front wall  14  of the can  1  along the predetermined breaking edge  3  and enters the can  1 . By this means, an opening  7  is created, out of which the contents of the can  1  may be discharged from the latter. 
     In  FIGS. 3, 3   a  and  4 , the opening element  4  is represented in detail.  FIG. 3  shows an embodiment of an opening element  4  according to the invention.  FIG. 4  shows the composition of the opening element  4  consisting of a basic body  40  and a carrier  20 . The opening element  4  exhibits a carrier body  40  made of conductive material, in particular aluminum, wherein on the side of the carrier body  40  facing toward the front wall  14  a carrier film  20  has been arranged or adhered which at least partly bears against the opening element  4 . On or within this carrier film  20  there extend the windings of the antenna  8  which has been linked to a transponder chip  9  situated on the carrier film  20 . The antenna  8  extends along the edge of the lower front face of the carrier body  40 , which faces toward the top wall  14  of the can  1 . The region of the basic body  40  of the opening element  4  that the carrier film  20  and the antenna  8  adjoin has been designed in the form of a loop, the loop  41  not being continuous but exhibiting an interruption  42 . By virtue of this interruption  42 , a shielding of electromagnetic fields at the antenna  8  is avoided when the can  1  is opened and the antenna  8  is removed from the front wall  14  of the can  1 . By virtue of the interruption  42 , the shielding is eliminated that would exist as such by virtue of the loop  41  of the basic body  4 . The width of the interruption  42 —that is to say, the region in which the antenna  8  has been released from the basic body  40 —may be arbitrarily small, so long as no relevant electric currents are able to form at right angles to the interruption. In practice, the width of the interruption will amount to about 0.1 mm to 5 mm. 
       FIG. 3 a    shows a sectional representation (A-A) of the opening element represented in  FIG. 3  in the region of the interruption  42  in the initial position bearing against the front wall  14  of the can. The antenna  8  extends within the carrier  20  and has been electrically isolated from the basic body  40  and the loop. In the region of the interruption  42  the loop  41  exhibits two end regions which have not been connected to one another so as to be electrically conducting, so that the loop  41  of the basic body  40  has not been closed and therefore also does not displace any electromagnetic fields. The antenna  8  has been routed across the interruption  42  from the one end of the loop  41  of the opening element  4  close to the interruption  42  to the opposite end of the loop  41  of the opening element  4  close to the interruption  42 . Whereas a mechanical bridging of the interruption  42  occurs by virtue of the antenna  8  and the carrier  20 , the two ends of the loop situated opposite one another at the interruption  42  have not been connected so as to be directly electrically conducting. A wireless electromagnetic communication is consequently possible in the opening position via the antenna  8 . 
     The interruption  42  is preferentially a cutout in the loop  41 , which was advantageously created mechanically by separating a partial region out of an originally complete loop. 
     By virtue of the arrangement of the carrier  20  and also of the antenna  8  in the region of the interruption  42 , an impairment of the mechanical stability of the opening element  4  caused by the interruption  42  may be prevented. Where appropriate, an electrically isolating connection between the two ends of the loop  41  may also exist in the region of the interruption  42 , in order to guarantee improved mechanical stability. 
     The connecting element  12  of the opening element  4  exhibits a central slot  16  through which the rivet  6  has been passed ( FIGS. 5, 6 ). 
     The carrier  20 , which carries the antenna  8  and the transponder chip  9 , advantageously takes the form of a film. The latter may have been adhesion-bonded or heat-sealed to the basic body  40  of the opening element  4 . The carrier  20  may advantageously take the form of an adhesive. However, it is also possible to apply the antenna  8  and the transponder chip  8  directly onto the basic body  4 . 
       FIG. 5  shows a section, extending through the interruption  42  of the opening element, through the can  1  and the opening element  4 , and also the electromagnetic behavior of the can  1  and of the opening element  4  in the initial position. As already mentioned, the antenna  8  bears against the opening element  4  on the side facing toward the front wall  14  of the can  1 . In the present exemplary embodiment, the antenna  8  bears with its full surface against the front wall  14  of the can. However, this is not absolutely essential. For the desired effect of a sufficient reaction on the electromagnetic fields directed from an external data communication device onto the antenna  8 , so that a communication between the external data communication device and the transponder chip  9  via the antenna  8  is impossible, it is sufficient that in the initial position the antenna  8  exhibits a maximum spacing of less than 2-3 mm. In the initial position, magnetic fields that are directed onto the antenna  8  are then displaced sufficiently from the wall region and surface region  5  on the front wall  14  of the can  1 , or the electrical properties of the antenna  8  are changed in such a manner that a communication between an external data communication device and the transponder chip  9  via the antenna  8  is impossible. The electrical connection between the transponder chip  9  and the antenna  8  is not represented in  FIGS. 5 and 6 . 
       FIG. 6  shows a section, extending through the interruption  42  of the opening element, through the can  1  and the opening element  4 , and also the electromagnetic behavior of the can  1  and of the opening element  4  in the opening position. In contrast to the initial position, by reason of the pivoting of the opening element  4  with respect to the front wall  14  of the can  1  in the opening position, in the actuating region  11  of the opening element  4  the antenna  8  has been lifted away from the front wall  14  of the can  1 . In this state, the opening element  4  has been distinctly electromagnetically decoupled from the wall region and surface region  5 . This means that the reaction, caused by the wall region and surface region  5 , on the electromagnetic field applied by an external data communication device has an effect on the antenna  8  in only very attenuated form. In this way, electromagnetic energy and also information may be transmitted by means of electromagnetic fields from an external data communication device to the transponder chip  9  via the antenna  8 . 
     Typically, cans  1  are manufactured completely from aluminum or some other metal. However, in the present exemplary embodiment this is not necessary. In order to guarantee the sufficient effect of field displacement, it is merely necessary that the wall region and surface region  5  of the can  1  against which the opening element  4  bears is electrically and/or magnetically conductive. In the present exemplary embodiment, the wall region or surface region  5  of the can  1  against which the opening element  4  bears exhibits an electrical conductivity of at least 10 6  S/m, in particular of at least 10 S/m. In addition, the can  1  exhibits a magnetic permeability of at least 4*π*10 −7  Vs/Am, in particular of at least 0.99*4*π*10 −7  Vs/Am, in the wall region and surface region  5  against which the opening element  4  bears. Aluminum, which is typically employed as material for the wall region and/or surface region of the can  1 , in particular for the entire can  1 , exhibits an electrical conductivity of 37*10 6  S/m and a magnetic permeability of (1+2.2*10 −5 )*4*π*10 −7  Vs/Am. 
     In  FIGS. 5 and 6 , magnetic field lines B have furthermore been sketched in, in order to illustrate the special case of the magnetic coupling between a magnetic field generated by an external data communication device and the antenna  8 . 
     In the case represented in  FIG. 5  with the opening element  4  in the initial position—that is to say, with an opening element  4  adjacent to the wall region and surface region  5 —eddy currents J are generated in the electrically and/or magnetically conductive wall region and surface region  5  by the magnetic field of the external data communication device, which give rise to a field displacement in the region of the opening element  4 , so that the resulting magnetic field penetrating the antenna  8  is too slight to enable a wireless electromagnetic communication between the external data communication device and the transponder chip  9  via the antenna  8 . 
     In the case represented in  FIG. 6  with the opening element  4  lifted away from the wall region and surface region  5 , there is a sufficiently large spacing between the antenna  8  and the wall region and surface region  5 , so that the field displacement brought about by the eddy currents in the wall region and surface region  5  acts on the antenna  8  only in more greatly attenuated manner, and the antenna  8  is sufficiently penetrated by the magnetic field, so that a wireless electromagnetic communication between the external data communication device and the transponder chip  9  is possible via the antenna  8 .