License plates for a vehicle

Abstract

In identification devices having a contactlessly readable data carrier ( 20 ) equipped with an antenna ( 17 ), the antenna ( 17 ) assigned to the data carrier ( 20 ) is formed by an electrically conductive part of the identification device ( 10 ) with a slit ( 18 ) provided therein, making the antenna ( 17 ) an integral component of the identification device ( 10 ), and making a separate antenna ( 17 ) redundant.

What is claimed is: 
     
         1 . An identification device for a vehicle with a main body ( 31 ) which has a plurality of layers, with one layer being provided with indicia ( 42 ), and with a contactlessly readable data carrier ( 38 ,  54 ,  66 ), to which an antenna ( 36 ,  59 ,  71 ) is assigned, wherein the data carrier ( 38 ,  54 ,  66 ) is configured as a data carrier ( 38 ,  54 ,  66 ) which generates a magnetic field and the antenna ( 36 ,  59 ,  71 ) comprises at least one layer ( 33 ,  52 ,  65 ) which is at least partially electrically conductive and with at least one slit-like gap ( 34 ,  53 ,  67 ) within the electrically conductive layer ( 33 ,  52 ,  65 ). 
     
     
         2 . The identification device according to  claim 1 , wherein the data carrier ( 38 ,  54 ,  66 ) is arranged in an electrically insulated manner within the slit-like gap ( 34 ,  53 ,  67 ) in the electrically conductive layer ( 33 ,  52 ,  65 ) in the region of an end of the slit-like gap ( 34 ,  53 ,  67 ). 
     
     
         3 . The identification device according to  claim 1 , wherein the data carrier ( 38 ,  54 ,  66 ) is spaced from the borders of the slit-like gap ( 34 ,  53 ,  67 ). 
     
     
         4 . The identification device according to  claim 1 , wherein the slit-like gap ( 34 ,  53 ,  67 ) has an enlargement ( 37 ,  72 ), with the data carrier ( 38 ,  54 ,  66 ) being arranged within the enlargement ( 37 ,  72 ) in the slit-like gap ( 34 ,  53 ,  67 ). 
     
     
         5 . The identification device according to  claim 1 , wherein the data carrier ( 38 ,  54 ,  66 ) is fixed within the enlargement ( 37 ,  72 ) in the slit-like gap ( 34 ,  53 ,  67 ) by means of at least one nonconductive layer of the main body ( 31 ). 
     
     
         6 . The identification device according to  claim 5 , wherein the at least one nonconductive layer is a self-adhesive reflective film, which is demetallized in the region of the data carrier ( 38 ,  54 ,  66 ), the slit-like gap ( 34 ,  53 ,  67 ) and the enlargement ( 37 ,  72 ). 
     
     
         7 . The identification device according to  claim 1 , wherein the electrically conductive layer ( 33 ) is applied by vaporization on one of the nonconductive layer of the main body ( 31 ). 
     
     
         8 . The identification device according to  claim 1 , wherein the data carrier ( 38 ,  54 ,  66 ) has a chip, at least one coil connected electroconductively to the chip, and a carrier made of an insulating material.