Method for the manufacture of a smart label, and a smart label

• US 20030218072A1
• Filed: 04/09/2003
• Published: 11/27/2003
• Est. Priority Date: 11/01/2000
• Status: Abandoned Application

• Current Assignee: Rafsac OY
• Original Assignee: Rafsac OY
• Inventors: Hanhikorpi, Marko
• Application Number:
  US10/410,071
• Publication Number:
  US 20030218072A1
• Time in Patent Office: Days
• US Class Current: 235/492
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 19/0726 the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card

Abstract

The invention relates to a method for the manufacture of a smart label. In the method, the smart label is provided with at least one oscillating circuit comprising at least one coil and at least one capacitor. Further in the method, at least one tuning element is formed in the oscillating circuit, for tuning of the oscillating circuit. The tuning of the oscillating circuit is performed, if necessary, by deactivating one or more of said tuning elements.

Claims

1. A method for the manufacture of a smart label, which smart label is provided with at least one oscillating circuit comprising at least one coil and at least one capacitor, in which method the oscillating circuit is provided with at least one inductive tuning element for tuning the oscillating circuit, and the oscillating circuit is tuned, if necessary, by deactivating one or more of said inductive tuning elements, wherein said at least one inductive tuning element is formed as a wire loop connected to said coil.

2. The method according to claim 1, in which a target resonance frequency is determined for the oscillating circuit and an allowable deviation from the target resonance frequency is determined for the resonance frequency, wherein that the tuning of the oscillating circuit comprises at least the following steps:

measuring the resonance frequency of the oscillating circuit,

comparing the measured resonance frequency with said target resonance frequency,

if the deviation of the resonance frequency from the target resonance frequency exceeds the allowed deviation, determining the need to change the resonance frequency of the oscillating circuit,

to implement the need to change, determining at least one deactivatable inductive tuning element, and

deactivating at least one inductive tuning element as determined in the preceding step.

3. The method according to claim 1 or 2, wherein the area of the wire loop is at least about ⅛

of the area of the innermost turn of the coil.

4. The method according to claim 3, wherein it comprises at least two inductive tuning elements, and that each tuning element is placed on different parts of the coil.

5. The method according to claim 4, wherein the smart label is provided with at least one integrated circuit.

6. A smart label which is provided with at least one oscillating circuit comprising at least one coil, at least one capacitor, and at least one inductive tuning element for tuning the oscillating circuit, and the oscillating circuit is arranged to be tuned, if necessary, by deactivating one or more of said inductive tuning elements, wherein said at least one inductive tuning element is formed as a wire loop connected to said coil.

7. A smart label according to claim 6, wherein the inductive tuning elements are connected to a coil by means of at least one conductor, and that the deactivation is arranged to be performed by disconnecting at least one conductor which connects the inductive tuning element to be deactivated to the coil.

8. The smart label according to claim 6 or 7, wherein the area of the wire loop is at least about ⅛

of the area of the innermost turn of the coil.

9. The smart label according to claim 8, wherein it comprises at least two inductive tuning elements, and that each tuning element is placed on different parts of the coil.

10. The smart label according to claim 9, wherein the smart label comprises at least one integrated circuit.

11. The smart label according to claim 10, wherein said capacitor is placed in said integrated circuit.