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| Thrust bearing device |
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Data medium for identifying objects, scanning device for interrogation of the data medium and process for controlling the data medium
| Details |
Inventors: Gila, Janos; Hraby, Gunther; Veith, Peter-Ernst; Schiefer, Martin; Asperger, Karl;
Assignee: Siemens AG Austria (Vienna, AT)
Primary Examiner: Horabik; Michael
Assistant Examiner: Beaulieu; Yonel
Attorney, Agent or Firm: Lerner; Herbert L., Greenberg; Laurence A.
A data medium for identifying objects, in particular gas cylinders, includes a data source and an energy source. Each data medium contains at least one RF signal reflector having a characteristic frequency which can be controlled by the data source. The waveform of the characteristic frequency containing the individual identification of the data medium is in coded form. A scanning device for interrogation of the data medium and a process for controlling the data medium are also provided. |
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DETAILED DESCRIPTION It is accordingly an object of the invention to provide a data medium for identifying objects, a scanning device for interrogation of the data medium and a process for controlling the data medium, which overcome the hereinafore-mentioned disadvantages of the heretofore-known products, devices and methods of this general type and in which the data medium has only a low power consumption and a high interrogation range.
With the foregoing and other objects in view there is provided, in accordance with the invention, a data medium for identifying objects, in particular products, comprising a data source, an energy source, and at least one RF signal reflector having a characteristic frequency to be controlled by the data source.
The data medium according to the invention is distinguished by low energy consumption, since it does not contain any active transmitting element.
In accordance with another feature of the invention, the at least one signal reflector of the data medium is formed by a slot antenna.
As a result, environmental influences are reduced to a minimum.
In accordance with a further feature of the invention, the slot antenna is made from a base of plastic provided with a metal layer, and the metal layer has a slot.
As a result, simple and inexpensive manufacture is possible.
In accordance with an added feature of the invention, there is provided an impedance which can be controlled by the data source for controlling the characteristic frequency of the signal reflector.
Consequently, movable parts are avoided and the fault susceptibility of the signal reflector is reduced.
In accordance with an additional feature of the invention, the slot antenna has two longitudinal borders, and the controllable impedance includes two variable capacitance diodes being inserted between the two longitudinal borders and being connected in series in high frequency terms and in parallel in low frequency terms.
This is advantageous since it results in a particularly effective modulation of the characteristic frequency
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