Deactivating device for deactivating EAS dual status magnetic tags

• US 5,341,125 A
• Filed: 01/15/1992
• Issued: 08/23/1994
• Est. Priority Date: 01/15/1992
• Status: Expired due to Term

• Current Assignee: Sensormatic Electronics LLC (Johnson Controls International plc)
• Original Assignee: Sensormatic Electronics Corporation (Johnson Controls International plc)
• Inventors: Plonsky, Christopher B., Balch, Brent F., Fallin, David
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): MULLEN, THOMAS J
• Application Number:
  US07/820,972
• Time in Patent Office: 951 Days
• Field of Search: 340/572, 340/825.31-825.34, 364/478, 235/383, 186/61, 335/284, 343/895
• US Class Current: 340/572.3
• CPC Class Codes: G08B 13/2411 Tag deactivation

Abstract

A deactivating device for deactivating a dual status EAS tag for use in an EAS system in which the device utilizes a detection field for detecting the presence of an active tag in a detection/deactivation zone and in which the device further utilizes a deactivation field which is matched to the detection field.

Claims

1. A deactivation device for use in an EAS system utilizing a deactivatable type EAS tag, for deactivating an active EAS tag positioned in a detection/deactivation area defined by three orthogonal reference planes, said deactivation device comprising:

means for detecting the presence of an active EAS tag in the detection/deactivation area, said means for detecting comprising means for transmitting a predetermined detection field into the detection/deactivation area and means for sensing a signal from said active EAS tag when said active EAS tag is situated at a detection position in said detection/deactivation area in response to said detection field, said detection position being a position in said detection/deactivation area at which the detection field results in a response signal from said active EAS tag, and said detection field at said detection position having components in said three orthogonal planes; and

means for deactivating said active EAS tag comprising means for transmitting a deactivating field into the detection/deactivation area, said deactivating field having a configuration preselected in relationship to said detection field such that the deactivating field deactivates said active EAS tag when said active EAS tag is situated at a deactivating position which is at a preset offset distance from said detection position and at which said deactivating field has components having orientations matched to the orientations of said components of said detection field at said detection position in said three orthogonal planes.

2. A deactivation device for use in an EAS system utilizing a deactivatable type EAS tag, for deactivating an active EAS tag positioned in a detection/deactivation area defined by three orthogonal reference planes, said deactivation device comprising:

means for detecting the presence of an active EAS tag in the detection/deactivation area, said means for detecting comprising means for transmitting a predetermined detection field into the detection/deactivation area and means for sensing a signal from said active EAS tag when said active EAS tag is situated at a detection position in said detection/deactivation area in response to said detection field, said detection position being a position in said detection/deactivation area at which said detection field results in a response signal from said tag;

means for deactivating said active EAS tag, said deactivating means being responsive to said detection of said tag in the detection/deactivation area by said detection means and comprising means for transmitting a deactivating field into the detection/deactivation area, said deactivating field having a configuration preselected in relationship to said detection field such that the deactivating field deactivates said active tag when said active tag is situated at a deactivating position in said detection/deactivation area; and

means for delaying for a predetermined period of time, measured from the detection of said tag, the operation of said deactivating means.

3. A deactivation device in accordance with claim 2 wherein:

said deactivating position is at a preset offset distance from said detection position;

and said predetermined period of time is related to the time it takes said active tag to travel said predetermined offset distance.

4. A deactivation device for use in an EAS system utilizing a deactivatable type EAS tag, for deactivating an active EAS tag positioned in a detection/deactivation area defined by three orthogonal reference planes, said deactivation device comprising:

transport means for transporting an article having said active EAS tag attached thereto through the detection/deactivation area, said transport means comprising a moving conveyor belt for carrying said article and said attached tag through the detection/deactivation area;

means for detecting the presence of said active EAS tag in the detection/deactivation area, said means for detecting comprising means for transmitting a predetermined detection field into the detection/deactivation area and means for sensing a signal from said active EAS tag when said active EAS tag is situated at a detection position in said detection/deactivation area in response to said detection field, said detection position being a position in said detection/deactivation area at which the detection field results in a response signal from said active EAS tag;

means for deactivating said active EAS tag comprising means for transmitting a deactivating field into the detection/deactivation area, said deactivating field having a configuration preselected in relationship to said detection field such that the deactivating field deactivates said active tag when said active tag is situated at a deactivating position which is at a preset offset distance from said detection position, said preset offset distance being in a direction corresponding to the movement of said conveyor belt;

and means for delaying for a predetermined period of time the operation of said deactivating means, said predetermined period of time corresponding to the time it takes said conveyor belt to move a distance corresponding to said preset offset distance.

5. A deactivation device for use in an EAS system utilizing a deactivatable type EAS tag, for deactivating an active EAS tag positioned in a detection/deactivation area defined by three orthogonal reference planes, said deactivation device comprising:

means for detecting the presence of an active EAS tag in the detection/deactivation area, said means for detecting comprising means for transmitting a predetermined electromagnetic detection field into the detection/deactivation area, said detection field transmitting means comprising a transmitting coil, and means for sensing a signal from said active EAS tag when said active EAS tag is situated at a detection position in said detection/deactivation area in response to said detection field, said detection position being a position in said detection/deactivation area at which the detection field results in a response signal from said active EAS tag, and said sensing means comprising a receiving coil;

means for deactivating said active EAS tag comprising means for transmitting a deactivating electromagnetic field into the detection/deactivation area, said deactivating field having a configuration preselected in relationship to said detection field such that the deactivating field deactivates said active tag when said active tag is situated at a deactivating position in said detection/deactivation area, said deactivation field transmitting means comprising a deactivation coil;

said transmitting and deactivation coils being positioned in a common plane;

and said receiving coil being positioned in a plane parallel to said common plane.

6. A deactivation device in accordance with claim 5 wherein:

said transmitting coil is circular;

said deactivation coil is square and is one of inscribed within and circumscribed around said circular transmitting coil;

and said receiving coil comprises first and second coil sections having respective first and second overlapping straight segments which extend centrally and between opposing vertices of said square coil and respective third and fourth arcuate segments which connect opposite ends of said first and second straight segments, respectively, and follow the circular contour of said transmitting coil.

7. A deactivation device for use in an EAS system utilizing a deactivatable type EAS tag, for deactivating an active EAS tag positioned in a detection/deactivation area defined by three orthogonal reference planes, said deactivation device comprising:

means for detecting the presence of an active EAS tag in the detection/deactivation area, said means for detecting comprising means for transmitting a predetermined detection field into the detection/deactivation area and means for sensing a signal from said active EAS tag when said active EAS tag is situated at a detection position in said detection/deactivation area in response to said detection field, said detection position being a position in said detection/deactivation area at which the detection field results in a response signal from said active EAS tag;

means for deactivating said active EAS tag comprising means for transmitting a deactivating field into the detection/deactivation area, said deactivating field having a configuration preselected in relationship to said detection field such that the deactivating field deactivates said active tag when said active tag is situated at a deactivating position in said detection/deactivation area; and

verification means, operating responsive to the operation of the deactivation means, for causing the detection means to detect whether the tag, which has been previously subjected to the deactivation field, is still activated, said verification means causing said deactivating means to operate in response to said detection means detecting that the tag is still activated and said verification means cyclically operating the detecting means and the deactivating means until it is detected that said activated tag is deactivated to said verification means cyclically operates a predetermined number of times.

8. Apparatus comprising:

a deactivation device for use in an EAS system utilizing a deactivatable type EAS tag, for deactivating an active EAS tag positioned in a detection/deactivation area, the deactivation device comprising;

transport means for transporting the active EAS tag through the detection/deactivation area;

means arranged to detect the presence of the active EAS tag in the detection/deactivation area as said tag is being transported by said transport means; and

means arranged to deactivate the active EAS tag positioned in the detection/deactivation area as said tag is being transported by said transport means.

9. Apparatus in accordance with claim 8 wherein said transport means comprises a moving conveyor belt.

10. Apparatus in accordance with claim 9, wherein:

said detecting means and said deactivating means are positioned under said moving conveyor belt.

11. Apparatus in accordance with claim 10 wherein:

said detecting and deactivating means are positioned between a top moving section and a bottom moving section of said conveyor belt.

12. Apparatus in accordance with claim 9 wherein:

said apparatus further comprises a checkout system which includes said transport means.

13. Apparatus in accordance with claim 12 wherein:

said checkout system further comprises a point-of-sale unit for verifying whether entry of an article bearing said tag to said checkout system is valid.

14. Apparatus in accordance with claim 13 wherein:

said deactivating device further comprises;

inhibiting means for inhibiting the operation of at least one of said means for detecting and said means for deactivating, said inhibiting means being disabled responsive to a communication from said point-of-sale unit indicating a valid entry of said article.

15. Apparatus in accordance with claim 13 wherein:

said checkout system includes a checkout counter in which said transport means is situated.

16. A method for use with a deactivatable type EAS tag used in an EAS system having a detection/deactivation area defined by three orthogonal reference planes, said method comprising:

transporting said active EAS tag through said detection/deactivation area;

detecting when an active EAS tag is positioned in said detection/deactivation area, comprising the steps of;

a. transmitting a predetermined detection field into the detection/deactivation area; and

b. sensing a responsive signal from said tag resulting from interaction of said tag and said detection field when said tag is situated at a detection position in said detection/deactivation area, said detection position being a position in said detection/deactivation area at which the detection field results in a response signal from the active EAS tag; and

deactivating said tag positioned in said detection/deactivation area, comprising the step of;

transmitting a deactivating field into the detection/deactivation area, said deactivating field having a configuration which is at a preset offset distance from said detection field such that the deactivating field deactivates said active EAS tag when said active EAS tag is at a deactivating position which is at a preset offset distance from said detection position, and said deactivating is delayed from said detecting for the time period it takes to transport said active EAS tag said offset distance.