RFID tags with EAS deactivation ability

• US 7,109,867 B2
• Filed: 09/09/2004
• Issued: 09/19/2006
• Est. Priority Date: 09/09/2004
• Status: Active Grant

• Current Assignee: Avery Dennison Retail Information Services LLC (Avery Dennison Corporation)
• Original Assignee: Avery Dennison Corporation
• Inventors: Forster, Ian James
• Primary Examiner(s): Lee, Benjamin C.
• Assistant Examiner(s): TANG, SON M
• Application Number:
  US10/936,907
• Publication Number:
  US 20060049947A1
• Time in Patent Office: 740 Days
• Field of Search: 3405721-5728, 235/375, 705 16- 25, 700/215, 700/225, 700/226, 700/227, 700/229
• US Class Current: 340/572.3
• 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
• CPC Class Codes: G08B 13/2414 using inductive tags
• CPC Class Codes: G08B 13/2417 having a radio frequency identification chip
• CPC Class Codes: G08B 13/2448 Tag with at least dual detection means, e.g. combined inductive and ferromagnetic tags, dual frequencies within a single technology, tampering detection or signalling means on the tag

Abstract

A radio-frequency identification (RFID) and an electronic article surveillance (EAS) tag includes an RFID device and an EAS device. The RFID device may operate in a plurality of states including an activated state in which communication with a reader is enabled and a deactivated state in which communication with a reader is disabled. The EAS device may operate in a plurality of states including an activated state in which activation of an alarm is enabled and a deactivated state in which activation of an alarm is disable. The RFID device may be deactivated when the EAS device is deactivated. For example, the same piece of equipment that deactivates the EAS device also deactivates the RFID device at the same time. The RFID device may include an antenna, an RFID chip connected to the antenna for communicating with a reader, and an active element operatively disposed with respect to the antenna. The active element, which may include a conductive strip or lead, may have an activated state in which the antenna is enabled for communicating with a reader in a far field and a deactivated state in which the antenna is disabled from communicating with a reader in a far field. In addition, the EAS device may include a magnetic resonator and a bias magnet. When activated, the bias magnet may cause or affect the resonator to resonate and the active element to be in the activated state. Further, when deactivated, the bias magnet may cause the active element to be in the deactivated state.

Claims

1. A radio-frequency identification (RFID) tag comprising:

an antenna;

an RFID chip connected to the antenna for communicating with a reader; and

an active element operatively disposed with respect to the antenna and having;

an activated state in which the antenna is enabled for communicating with a reader in a far field; and

a deactivated state in which the antenna is disabled from communicating with a reader in a far field;

the active element changing from the activated state to the deactivated state when operatively subjected to an electronic article surveillance (EAS) deactivator;

an EAS device including a resonant circuit with a capacitive element that has an active state by functioning as a capacitor at low frequencies and a deactivate state by functioning as a transmission line when the EAS device is subjected to ultra-high frequencies;

the active element to be in the activated state when the capacitive element is activated; and

the active element to be in the deactivated state when the capacitive element is deactivated.

2. The RFID tag of claim 1 wherein the active element causes the antenna to operate at a reduced efficiency when in the deactivated state.

3. The RFID tag of claim 1 wherein the active element causes the antenna to operate at a first frequency when in the activated state and at a second frequency when in the deactivated state.

4. The RFID tag of claim 1 further comprising an EAS device including:

a magnetic resonator; and

a bias magnet for causing;

the resonator to resonate when the bias magnet is activated;

the active element being in the activated state when the bias magnet is activated; and

the active element being in the deactivated state when the bias magnet is deactivated.

5. A radio-frequency identification (RFID) and electronic article surveillance (EAS) tag comprising:

an RFID device including;

an antenna;

an RFID chip connected to the antenna for communicating with a reader; and

an active element operatively disposed with respect to the antenna and having;

an activated state in which the antenna is enabled for communicating with a reader in a far field; and

a deactivated state in which the antenna is disabled from communicating with a reader in a far field;

an EAS device including;

a magnetic resonator; and

a bias magnet for causing;

the resonator to resonate when the bias magnet is activated;

the active element to be in the activated state when the bias magnet is activated; and

the active element to be in the deactivated state when the bias magnet is deactivated

the magnetic resonator having a capacitive element that has an active state by functioning as a capacitor at low frequencies and a deactivate state by functioning as a transmission line when the EAS device is subjected to ultra-high frequencies;

the active element to be in the activated state when the capacitive element is activated; and

the active element to be in the deactivated state when the capacitive element is deactivated.

6. The RFID and EAS tag of claim 5 wherein the active element causes the antenna to operate at a reduced efficiency when in the deactivated state.

7. The RFID and EAS tag of claim 5 wherein the active element causes the antenna to operate at a first frequency when in the activated state and at a second frequency when in the deactivated state.

8. A radio-frequency identification (RFID) and an electronic article surveillance (EAS) tag comprising:

an RFID device including;

an antenna;

an RFID chip connected to the antenna for communicating with a reader; and

an active element operatively disposed with respect to the antenna and having;

an activated state in which the antenna is enabled for communicating with a reader in a far field; and

a deactivated state in which the antenna is disabled from communicating with a reader in a far field;

an EAS device including;

a magnetic resonator; and

a bias magnet for causing;

the resonator to resonate when the bias magnet is activated;

the active element to be in the activated state when the bias magnet is activated; and

the active element to be in the deactivated state when the bias magnet is deactivated;

wherein;

the antenna includes a loop antenna having a gap; and

the active element includes a conductive strip such that;

when in the activated state, the conductive strip is positioned in operative proximity with the gap; and

when in the deactivated state, the conductive strip is not positioned in operative proximity with the gap.

9. The RFID and EAS tag of claim 8 wherein the conductive strip reduces a capacitance across the gap in the antenna when in the deactivated state.

10. The RFID and EAS tag of claim 8 wherein the gap of the antenna is positioned between the conductive strip and the bias magnet such that the conductive strip is urged toward the gap when the bias magnet is activated.

11. The RFID and EAS tag of claim 10 wherein the conductive strip is biased away from the gap such that when the bias magnet is deactivated, the conductive strip moves away from the gap.

12. A radio-frequency identification (RFID) and an electronic article surveillance (EAS) tag comprising:

a magnetic resonator;

a loop antenna having a gap;

an RFID chip connected to the antenna;

a conductive strip disposed on a first side of the antenna at or near the gap and being positioned out of operative proximity with the gap of the antenna; and

a bias magnet disposed between a second side of the antenna and the magnetic resonator such that the gap of the antenna is positioned between the conductive strip and the bias magnet;

when the bias magnet is activated;

the resonator resonates; and

the conductive strip is drawn into operative proximity with the gap of the antenna.

13. The RFID and EAS tag of claim 12 wherein when the bias magnet is deactivated:

the resonator stops resonating; and

the conductive strip moves away from the gap of the antenna.

14. A radio-frequency identification (RFID) tag comprising:

an antenna;

an RFID chip including a pair of conductive magnetic pads; and

an active element connected to the antenna, operatively disposed with respect to the pads, and having;

an activated state in which the antenna is in electrical communication with the chip; and

a deactivated state in which the antenna is not in electrical communication with the chip, wherein the active element includes a pair of conductive leads connected to the antenna and for respectively contacting the pads when the pads are magnetized in the activated state and disconnecting at least one of the conductive leads from a respective pad when in the deactivated state.

15. The RFID tag of claim 14 wherein the active element is in the deactivated state when the pads are demagnetized.

16. The RFID tag of claim 15 wherein the chip is disposed in a spaced relationship with the antenna such that a gap is defined between the antenna and the pads and wherein:

at least one of the conductive leads is connected to the antenna at a first end thereof and is movable in the gap at a second end thereof to disconnect from a respective one of the pads.

17. The RFID tag of claim 14 wherein the conductive leads are biased to be in the deactivated state.

18. A radio-frequency identification (RFID) tag comprising:

an antenna;

an RFID chip including a pair of conductive magnetic pads; and

a pair of conductive leads connected to the antenna, the pair of conductive leads respectively contacting the pads when the pads are magnetized and being disconnected from the pads when the pads are demagnetized.

19. The RFID tag of claim 18 wherein the chip is disposed in a spaced relationship with the antenna such that a gap is defined between the antenna and the pads and wherein:

at least one of the conductive leads is connected to the antenna at a first end thereof and is movable in the gap at a second end thereof to disconnect from a respective one of the pads.

20. A radio-frequency identification (RFID) tag comprising:

a substrate including at least one aperture;

an RFID chip including at least one conductive magnetic pad disposed at the aperture on a first side of the substrate; and

an antenna including at least one moveable arm with an end disposed at the aperture on a second side of the substrate, the antenna including;

an activated state in which the end of the arm is drawn to the pad is magnetized and in electrical communication with the pad; and

a deactivated state in which the end of the arm is disconnected from the pad and not in electrical communication with the pad.

21. The RFID tag of claim 20 further comprising a lens for indicating when the antenna is in the deactivated state.

22. A radio-frequency identification (RFID) and electronic article surveillance (EAS) tag comprising:

an RFID device having an RFID chip for operating in a plurality of states including an activated state in which communication with a reader is enabled and a deactivated state in which communication with a reader is disabled; and

an EAS device for operating in a plurality of states including an activated state in which activation of an alarm is enabled and a deactivated state in which activation of an alarm is disable;

the EAS device comprising a resonant circuit with a capacitive element that has an active state by functioning as a capacitor at low frequencies and a deactivate state by functioning as a transmission line when the EAS device is subjected to ultra-high frequencies;

wherein the RFID device is deactivated when the EAS device is deactivated by the capacitive element short circuiting the RFID chip when the EAS device is subjected to ultra-high frequencies.

23. A radio-frequency identification (RFID) and electronic article surveillance (EAS) tag comprising:

an RFID device enabled for communicating with a reader when activated and disabled from communicating with a reader when deactivated, the RFID device device having a movable active element having an active state in which the active element connects an RFID chip to an RFID antenna of the RFID device and a deactivate state in which the active element is moved to disconnect at least a portion of the RFID antenna from the RFID chip; and

an EAS device enabled for activating an alarm when activated and disabled from activating an alarm when deactivated;

the movaqble active element of the RFID device being influenced by an activation state of the EAS device;

wherein the RFID device is deactivated when the EAS device is deactivated.

24. A method for controlling the operability of a radio-frequency identification (RFID) device and electronic article surveillance (EAS) device, the RFID device enabled for communicating with a reader when activated and disabled from communicating with a reader when deactivated, the EAS device enabled for activating an alarm with activated and disabled from activating an alarm when deactivated, the method comprising:

influencing an active element of the RFID device based on an activation state of the EAS device; and

deactivating the RFID device when the EAS device is deactivated, the deactivating the RFID device comprising moving the active element from an active state in which the active element connects an RFID chip to an RFID antenna of the RFID device to a deactive state in which the active element is moved to disconnect at least a portion of the RFID antenna from the RFID chip.

25. The method of claim 24 wherein the deactivating step comprises deactivating the RFID device substantially simultaneously with the EAS device.

26. The method of claim 24 wherein the deactivating step comprising deactivating the RFID device with the same device that deactivates the EAS device.