Abstract:
The disclosure relates to a communications device for transmitting data on a product to a data processing device, the product being assigned a transponder, which can be brought into communication as required with a read device assigned to the data processing device. It is proposed to equip the transponder with a transducer for converting a physical quantity of the product into an electrical quantity.

Description:
RELATED APPLICATIONS 
       [0001]    This application claims priority under 35 U.S.C. §119 to German Application 102006042735.1 filed in Germany on Sep. 12, 2006, the entire contents of which are hereby incorporated by reference in their entireties. 
       TECHNICAL FIELD 
       [0002]    The disclosure relates to a communications device for transmitting data on a product to a data processing device. 
       BACKGROUND INFORMATION 
       [0003]    It is known to use RFID technology (radio frequency identification) to assign to a product static information for its identification in a manner that is readable. For this purpose, the product is equipped with a transponder which essentially comprises an antenna, an analog communications circuit, a digital circuit and a permanent memory. The product identification is stored in the memory in a manner that allows it to be overwritten. 
         [0004]    The transponder communicates without contact with a read device brought into proximity such that a high-frequency electromagnetic field generated by the read device is modified by the transponder by load modulation as a function of the stored identification. The field changes are detected in the read device and the identification encoded therein is reconstructed. 
         [0005]    In addition, passive transponders are supplied with power from the high-frequency electromagnetic field, whilst active transponders are equipped with a local power source. 
         [0006]    The read device can be equipped with means for forwarding the data received from the transponder to an external data processing device, or it can itself be a data processing device. 
         [0007]    It is also known to determine physical properties of a product using sensors suitable for converting a physical quantity of the product into an electrical quantity, and to transmit them to a data processing device. 
         [0008]    Known sensors, particularly in automation engineering, usually involve high installation costs for cables, pipe connections and the like. This makes it at least very difficult, and sometimes even impossible, to install them later or to take measurements from difficult to access or moving measurement points. 
       SUMMARY 
       [0009]    The object of the disclosure is hence to improve the known communications device so that at least one physical property of the product is kept actively ready for transmission to a data processing device. 
         [0010]    The disclosure is based on a communications device for transmitting data on a product to a data processing device, the product being assigned a transponder, which can be brought into communication as required with a read device assigned to the data processing device. 
         [0011]    According to the disclosure, the transponder is equipped with a transducer for converting a physical quantity of the product into an electrical quantity. The transducer is connected to the electronic circuit of the transponder in such a way that the electrical quantity output by the transducer, as an alternative to, or in conjunction with the identification, can be retrieved in the memory of the transponder as required by the read device. 
         [0012]    In each powered transponder, irrespective of the nature of the power supply, the transducer-specific physical quantity of the product is translated into an electrical quantity, and is kept ready for retrieval as the active physical property of the product, and on retrieval is transmitted to the read device by the transport mechanisms known per se and described in the introduction. 
         [0013]    Advantageously, in addition to the presence of a product, at least one physical property of interest of the product is also available without visual or mechanical contact with the product. Measurements of product properties are possible in this case in the product even in a hazardous area and under restrictions for reasons of hygiene. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    Further details and advantages of the invention are described in greater detail below with reference to exemplary embodiments, where in the drawings required for this, 
           [0015]      FIG. 1  shows a block diagram of an exemplary transponder according to the disclosure 
           [0016]      FIG. 2  shows a block diagram for an application of the communications device in a production facility 
           [0017]      FIG. 3  shows a block diagram for an application of the communications device in quality assurance 
       
    
    
     DETAILED DESCRIPTION 
       [0018]      FIG. 1  shows a block diagram of an exemplary transponder  100  according to the features of the disclosure. The transponder  100  has an antenna  101 , which is connected to a communications circuit  102 . In addition, a digital circuit  103  is provided, which is connected to a memory  104 . According to the disclosure, the transponder  100  has a transducer  105  for converting a physical quantity into an electrical quantity, said transducer being connected to the digital circuit  103 . The digital circuit  103  can be implemented by a microcontroller. 
         [0019]    The transponder  100  as shown in  FIG. 2  is in non-contact communication with a read device  200  in close proximity. A high-frequency electromagnetic field generated by the read device  200  is modified here by the transponder  100  by load modulation as a function of the data to be transmitted. The field changes are detected in the read device  200  and the data encoded therein is reconstructed. 
         [0020]    In a first embodiment, the transponder  100  is supplied with power from the high-frequency electromagnetic field, and is referred to below as a passive transponder. 
         [0021]    In an alternative embodiment, the transponder  100  is equipped with a local energy store, which supplies the transponder  100  with power. The transponder having this embodiment is referred to below as an active transponder. 
         [0022]    Static information for identifying the transponder  100  is stored in the memory  104 . For an active transponder  100 , it can be provided to measure the physical quantity continuously or periodically and record the measurements in the memory  104 . On coming within range of a read device  200 , the series of measurements is then transmitted to the read device  200 . For this purpose, a product  400  is equipped with an active transponder  100 , as shown in  FIG. 3 . During storage and transport of the product  400 , a physical quantity of the product  400  such as the temperature, is recorded periodically. When definable events occur, such as shipment or handover to the customers, the read device  200 , which preferably comprises means for data processing, is used to read out the recorded series of temperature measurements. 
         [0023]    Advantageously, by measuring the physical quantity during the entire production process, transport and/or storage, it is possible to achieve simple and continuous monitoring of certain conditions over time. By this means it is possible to detect the occurrence of prohibited conditions, such as exceeding the maximum temperature during manufacture, a break in the cold chain, compliance with specific minimum cooking times and the like. This provides assistance in quality control and quality assurance using batch identification. 
         [0024]    In addition, the communications device according to the disclosure enables simple measurements in hygienically critical areas, such as deep frozen foodstuff. For this purpose, it can be provided to place the transponder  100  in the packaging of the product  400 . Opening the packaging or touching the packaged product  400  can thereby be avoided in an inspection. 
         [0025]    A passive transponder  100  can be provided to be carried directly by a product flowing through a production facility  300 , as shown in  FIG. 2 , and to be moved through the production facility  300 . A plurality of read devices  200  are arranged along the path of the flowing product, which temporarily activate a passing transponder  100  at allotted points in the production facility  300 , and read out the measured value. 
         [0026]    If the transponder  100  remains in the product after leaving the production facility  300 , monitoring can be continued during storage or transport to the end customer. 
         [0027]    Advantageously, the communications device according to the disclosure enables end-to-end measurement at any point in the production process, and in particular in a hazardous area. In addition, the communications device allows extremely versatile use both with stationary and mobile read devices  200 . 
         [0028]    It will be appreciated by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The presently disclosed embodiments are therefore considered in all respects to be illustrative and not restricted. The scope of the invention is indicated by the appended claims rather than the foregoing description and all changes that come within the meaning and range and equivalence thereof are intended to be embraced therein. 
       LIST OF REFERENCES 
       [0000]    
       
           100  transponder 
           101  antenna 
           102  communications circuit 
           103  digital circuit 
           104  memory 
           105  transducer 
           200  read device 
           300  production facility 
           400  product