EAS tag with mechanically vibrating magnetic element and improved housing and method of making same

• US 5,357,240 A
• Filed: 10/16/1992
• Issued: 10/18/1994
• Est. Priority Date: 10/16/1992
• Status: Expired due to Term

• Current Assignee: Sensormatic Electronics LLC (Johnson Controls International plc)
• Original Assignee: Sensormatic Electronics Corporation (Johnson Controls International plc)
• Inventors: Kowalczyk, John, Sanford, Robert J., Wulf, John D.
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): MULLEN, THOMAS J
• Application Number:
  US07/962,274
• Time in Patent Office: 732 Days
• Field of Search: 340/572, 340/568, 340/551, 340/693, 29/592.1, 53/462, 206/460, 206/444, 206/818
• US Class Current: 340/572.8
• CPC Class Codes: G08B 13/2408 using ferromagnetic tags
• CPC Class Codes: G08B 13/2434 Tag housing and attachment details
• CPC Class Codes: G08B 13/2437 Tag layered structure, processes for making layered tags
• CPC Class Codes: G08B 13/244 Tag manufacturing, e.g. continuous manufacturing processes
• CPC Class Codes: G08B 13/2442 Tag materials and material properties thereof, e.g. magnetic material details
• CPC Class Codes: Y10S 206/818 Magnet

Abstract

An EAS tag comprising a tag body having a central region, side wall regions connected to and integral with the central region and flap regions connected to and integral with the side wall regions. The tag body has fold lines at the junctions of the central and side wall regions and at the junctions of the side wall regions and the flap regions. By folding the tag body along these fold lines and, in the course of the folding procedure, inserting a first magnetic element, a substantially closed box-like housing with the first magnetic element loosely housed therein is formed.

Claims

1. An EAS tag comprising:

a tag body including;

a central region;

side wall regions connected to and integral with the central region;

first fold lines at the junctions of said central region and said side wall regions at which said side wall regions are folded;

flap regions connected to and integral with said side wall regions; and

second fold lines at the junctions of said side wall regions and said flap regions at which said flap regions are folded so as to come together to form a closed cover facing and spaced from said central region, thereby forming a closed housing;

and a first magnetic element, said first magnetic element being disposed in said closed housing and mechanically vibrating in response to an interrogation field.

2. An EAS tag in accordance with claim 1 further comprising:

a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to an interrogation field;

and means for securing said second magnetic element to said tag body.

3. An EAS tag in accordance with claim 2 wherein:

said securing means secures said second magnetic element to said cover of said tag body.

4. An EAS tag in accordance with claim 3 wherein:

said securing means comprises;

a liner; and

an adhesive means on one side of said liner from which said liner peeled;

said second magnetic element being secured to said adhesive means;

and said adhesive means securing said securing means to said cover of said tag body.

5. An EAS tag in accordance with claim 4 wherein:

said adhesive means has a length and width which are at least commensurate with the length and width, respectively, of said cover of said tag body.

6. An EAS tag in accordance with claim 5 wherein:

said second magnetic element has a length and width which are less than the length and width, respectively, of said adhesive means.

7. An EAS tag in accordance with claim 4 wherein:

said adhesive means includes;

a first adhesive layer on said one side of said liner;

said second magnetic element being adhered to said first adhesive layer; and

a second adhesive layer overlying said second magnetic element and said first adhesive layer.

8. An EAS tag in accordance with claim 7 wherein:

said first and second layers have lengths and widths which are at least commensurate with the length and width, respectively, of said cover of said tag body.

9. An EAS tag in accordance with claim 8 wherein:

said second magnetic element has a length and width which are less than the lengths and widths, respectively, of said first and second layers.

10. An EAS tag in accordance with claim 2 wherein:

said first magnetic element is a ferromagnetic element;

and said second magnetic element is a hard or semi-hard magnetic element.

11. An EAS tag in accordance with claim 10 wherein:

said first magnetic element is a magnetostrictive element.

12. An EAS tag in accordance with claim 1 wherein:

said first magnetic element has a length and width which are less than the length and width, respectively, of said central region and a thickness which is less than the height of said side wall regions.

13. An EAS tag in accordance with claim 1 wherein:

said flap regions have edges which mate when said flap regions are together forming said closed cover.

14. An EAS tag in accordance with claim 1 wherein:

said central region is rectangular having first and second opposing longer sides and first and second opposing shorter sides;

said side wall regions comprise first, second, third and fourth rectangular side wall regions, said first and second side wall regions being integral with said first and second longer sides of said central region and said third and fourth side wall regions being integral with said first and second shorter sides of said central region;

and said flap regions comprise first and second triangular flap regions integral with said third and fourth side wall regions, and third and fourth trapezoidal flap regions integral with said first and second side wall regions.

15. An EAS tag in accordance with claim 14 wherein:

said flap regions have edges which mate when said flap regions are together forming said closed cover.

16. An EAS tag in accordance with claim 15 wherein:

the heights of said side wall regions are equal.

17. An EAS tag in accordance with claim 16 wherein:

the lengths of the sides of said triangular and trapezoidal flap regions are equal.

18. An EAS tag in accordance with claim 1 wherein:

said tag body when unfolded forms a hexagonal strip having first, second, third, fourth, fifth and sixth sides, said first and fourth sides being opposing and parallel, said second and fifth sides being opposing and parallel, and said third and sixth sides being opposing and parallel, said second, third, fifth and sixth sides being of equal first length and said first and fourth sides being of equal second length greater than said first length, each of said second, third, fifth and sixth sides having an L shaped notch positioned and dimensioned such that the length of the respective second, third, fifth and sixth side from one end of the respective second, third, fifth add sixth side to the point at which the legs of the L shaped notch of the respective second, third, fifth and sixth side intersect each other is equal to the length of the respective second, third, fifth and sixth side from the other end of the respective Second, third, fifth and sixth side to said point where the legs of the L shaped notch of the respective second, third, fifth and sixth side intersect each other.

19. An EAS tag in accordance with claim 18 wherein:

the legs of the notch of the second side intersect the second side at respective first and second intersection points and interest each other at a third intersection point;

the legs of the notch of the third side intersect the third side at respective fourth and fifth intersection points and each other at a sixth intersection point;

the legs of the notch of the fifth side intersect the fifth side at respective seventh and eight intersection points and each other at a ninth intersection;

the legs of the notch of the sixth side intersect the sixth side at the respective tenth and eleventh intersection points and each other at a twelfth intersection point;

said second set of fold lines connect said first and fourth, second and eleventh, fifth and seventh, and eight and tenth intersection points;

and said first set of fold lines connect said third and sixth, sixth and ninth, ninth and twelfth, and twelfth and third intersection points.

20. An EAS tag in accordance with claim 1 further comprising:

a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to an interrogation field, said second magnetic element being disposed in said housing.

21. An EAS tag in accordance with claim 1 wherein:

said first magnetic element comprises a first magnetic part which when magnetized arms said first magnetic element to mechanically vibrate in response to an interrogation field.

22. An EAS tag in accordance with claim 21 wherein:

said first magnetic part forms a surface portion of said first magnetic element.

23. An EAS tag in accordance with claim 1 further comprising:

a liner;

an adhesive means on one side of said liner from which said liner is peeled; and

said adhesive means being secured to said cover of said tag body.

24. An EAS tag in accordance with claim 23 wherein:

said first magnetic element comprises a first magnetic part which when magnetized arms said first magnetic element to mechanically vibrate in response to an interrogation field.

25. Apparatus for forming an EAS tag comprising:

supply means for supplying a strip of material; and

die and mandrel assembly means for;

receiving said strip of material from said supply means;

folding said strip of material to form a first set of fold lines defining flap regions;

folding said strip of material to form a second set of fold lines defining side wall regions and a central region, said side wall regions being integral with said flap regions and said central region being integral with said side wall regions, said first set of fold lines being at the junctions of said flap regions and said side wall regions and said second set of fold lines being at the junctions of said side wall regions and said central region;

disposing a first magnetic element in said central region; and

folding said flaps to cause said flaps to come together to form a closed cover facing and spaced from said central region;

thereby forming a closed housing with said first magnetic element held therein to define a tag body.

26. Apparatus in accordance with claim 25 further comprising:

means for forming a carrier including a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to an interrogation field;

and means for causing said carrier and said housing to be secured together.

27. Apparatus in accordance with claim 26 wherein:

said means for causing causes said carrier and said cover of said housing to be secured together.

28. Apparatus in accordance with claim 27 wherein:

said carrier forming means includes;

means for supplying a liner;

means for applying an adhesive means to said liner and for enabling said second magnetic element to be adhered to said adhesive means;

and said means for causing causes said adhesive means and said cover of said housing to be secured together.

29. Apparatus in accordance with claim 28 wherein:

said adhesive applying means includes;

means for applying a first adhesive layer to said liner;

means for enabling said second magnetic element to be adhered to said first adhesive layer; and

means for applying a second adhesive layer over said second magnetic element and said first adhesive layer;

and said means for causing causes said second adhesive layer and said cover of said housing to be secured together.

30. Apparatus in accordance with claim 25 wherein:

said strip of material is hexagonal and has first, second, third, fourth, fifth and sixth sides, said first and fourth sides being opposing and parallel, said second and fifth sides being opposing and parallel, and said third and sixth sides being opposing and parallel, said second, third, fifth and sixth sides being of equal first length and said first and fourth sides being of equal second length greater than said first length, each of said second, third, fifth and sixth sides having an L shaped notch positioned and dimensioned such that the length of the respective second, third, fifth and sixth side from one end of the respective second, third, fifth and sixth side to the point at which the legs of the L shaped notch of the respective second, third fifth and sixth side intersect each other is equal to the length of the respective second, third, fifth and sixth side from the other end of the respective second, third, fifth and sixth side to said point where the legs of the L shaped notch of the respective second, third, fifth and sixth side intersect each other.

31. Apparatus in accordance with claim 30 wherein:

the legs of the notch of the second side intersect the second side at respective first and second intersection points and interest each other at a third intersection point;

the legs of the notch of the third side intersect the third side at respective fourth and fifth intersection points and each other at a sixth intersection point;

the legs of the notch of the fifth side intersect the fifth side at respective seventh and eight intersection points and each other at a ninth intersection;

the legs of the notch of the sixth side intersect the sixth side at the respective tenth and eleventh intersection points and each other at a twelfth intersection point;

said first set of fold lines connect said first and fourth, second and eleventh, fifth and seventh, and eighth and tenth intersection points;

and said second set of fold lines connect said third and sixth, sixth and ninth, ninth and twelfth, and twelfth and third intersection points.

32. Apparatus in accordance with claim 25 wherein:

said die and mandrel assembly means includes;

a die cavity having upper and lower sub-cavities, said lower sub-cavity being of smaller dimension than said upper sub-cavity.

33. Apparatus in accordance with claim 32 wherein:

said lower sub-cavity includes a magnetic means.

34. Apparatus in accordance with claim 32 wherein:

said die and mandrel assembly means further includes;

a first die head of dimension equal to the dimension of said upper sub-cavity for interacting with said upper sub-cavity and said strip to fold said strip to form said first set of fold lines;

a second die head of dimension equal to the dimension of said lower sub-cavity for interacting with said lower sub-cavity and said strip to form said second set of fold lines; and

one or more further die heads of dimension slightly less than the dimension of said lower sub-cavity for interacting with said strip to fold said flap regions.

35. Apparatus in accordance with claim 34 wherein:

said one or more further die heads include a third die head of configuration so as to interact with the side wall regions of said strip to partially fold said flap regions and a fourth die head of configuration so as to interact with said flap regions to fully fold said partially folded flap regions to provide said cover.

36. Apparatus in accordance with claim 34 wherein:

said lower sub-cavity includes at least one bore;

and said apparatus further includes means in said bore for urging said strip from said die cavity.

37. Apparatus in accordance with claim 34 wherein:

said die and mandrel assembly means further includes;

an indexing table carrying said die cavity; and

means for indexing said table to bring said die cavity to first, second and one or more further stations adjacent said table;

and said first, second and one or more further die heads being situated at said first, second and one or more further stations, respectively.

38. An apparatus in accordance with claim 25 wherein:

said first magnetic element mechanically vibrates in response to an interrogation field.

39. A method of forming an EAS tag comprising the steps of:

folding a strip of material to form a first set of fold lines defining flap regions;

folding said strip of material to form a second set of fold lines defining side wall regions and a central region, said side wall regions being integral with said flap regions and said central region being integral with said side wall regions, said first set of fold lines being at the junctions of said flap regions and said side wall regions and said second set of fold lines being at the junctions of said side wall regions and said central region;

disposing a first magnetic element said central region;

and folding said flaps to cause said flaps to come together to form a closed cover facing and spaced from said central region;

thereby forming a closed housing with said first magnetic element held therein to define a tag body.

40. A method in accordance with claim 39 further comprising:

securing together said tag body and a carrier which includes a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to an interrogation field.

41. A method in accordance with claim 40 wherein:

said securing step is carried out by securing said carrier and said cover of said tag body together.

42. A method in accordance with claim 41 wherein:

said securing step is carried out by securing an adhesive layer included on said carrier and said cover of said tag body together.

43. A method in accordance with claim 40 further comprising steps for forming said carrier, including:

applying a first adhesive layer to a liner;

applying said second magnetic element to said first adhesive layer; and

applying a second adhesive layer over said first adhesive layer and second magnetic element.

44. A method in accordance with claim 43 wherein:

said securing step is carried out by securing said second adhesive layer of said carrier and said cover of said tag body together.

45. A method in accordance with claim 39 wherein:

said strip of material is hexagonal and has first, second, third, fourth, fifth and sixth sides, said first and fourth sides being opposing and parallel, said second and fifth sides being opposing and parallel, and said third and sixth sides being opposing and parallel, said second, third, fifth and sixth sides being of equal first length and said first and fourth sides being of equal second length greater than said first length, each of said second, third, fifth and sixth sides having L shaped notches positioned and dimensioned such that the length of the respective second, third, fifth and sixth side from one end of the respective second, third, fifth and sixth side to the point at which the legs of the L shaped notch of the respective second, third, fifth and sixth side intersect each other is equal to the length of the respective second, third, fifth and sixth side from the other end of the respective second, third, fifth and sixth side to said point where the legs of the L shaped notch of the respective second, third, fifth and sixth side intersect each other.

46. A method in accordance with claim 45 wherein:

the legs of the notch of the second side intersect the second side at respective first and second intersection points and interest each other at a third intersection point;

the legs of the notch of the third side intersect the third side at respective fourth and fifth intersection points and each other at a sixth intersection point;

the legs of the notch of the fifth side intersect the fifth side at respective seventh and eight intersection points and each other at a ninth intersection;

the legs of the notch of the sixth side intersect the sixth side at the respective tenth and eleventh intersection points and each other at a twelfth intersection point;

said first set of fold lines connect said first and fourth, second and eleventh, fifth and seventh, and eighth and tenth intersection points;

and said second set of fold lines connect said third and sixth, sixth and ninth, ninth and twelfth, and twelfth and third intersection points.

47. A method in accordance with claim 39 wherein:

a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to an interrogation field is disposed in said closed housing.

48. A method in accordance with claim 39 wherein:

said first magnetic element comprises a first magnetic part which when magnetized arms said first magnetic element to mechanically vibrate in response to an interrogation field.

49. A method in accordance with claim 48 wherein:

said first magnetic part forms a surface portion of said first magnetic element.

50. A method of forming an EAS tag in accordance with claim 39 wherein:

said first magnetic element mechanically vibrates in response to an interrogation field.

51. An EAS system comprising:

means for transmitting a first magnetic field into an interrogation zone;

an EAS tag comprising;

a central region;

side wall regions connected to and integral with the central region;

first fold lines at the junctions of said central region and said side wall regions at which said side wall regions are folded;

flap regions connected to and integral with said side wall regions; and

second fold lines at the junctions of said side wall regions and said flap regions at which said flap regions are folded so as to come together to form a closed cover facing and spaced from said central region, thereby forming a closed housing defining a tag body; and

a first magnetic element, said first magnetic element being disposed in said closed housing;

and means for receiving a magnetic signal resulting from the interaction of said first magnetic field and said EAS tag for detecting the presence of said EAS tag in said interrogation zone.

52. An EAS system in accordance with claim 51 wherein:

said EAS tag further comprises;

a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to said first magnetic field;

and means for securing said second magnetic element to said tag body.

53. An EAS system in accordance with claim 52 wherein:

said securing means secures said second magnetic element to said cover of said tag body.

54. An EAS system in accordance with claim 51 wherein:

said EAS tag further comprises;

a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to said first magnetic field, said second magnetic element being disposed in said housing.

55. An EAS system in accordance with claim 51 wherein:

said first magnetic element comprises a first magnetic part which when magnetized arms said first magnetic element to mechanically vibrate in response to said first magnetic field.

56. An EAS system in accordance with claim 55 wherein:

said first magnetic part forms a surface portion of said first magnetic element.

57. An EAS system in accordance with claim 51 wherein:

said first magnetic element mechanically vibrates in response to said first magnetic field.

58. A method of operating an EAS system comprising:

transmitting a first magnetic field in an interrogation zone;

situating an EAS tag in said interrogation zone, said EAS tag comprising;

a central region;

side wall regions connected to and integral with the central region;

first fold lines at the junctions of said central region and said side wall regions at which said side wall regions are folded;

flap regions connected to and integral with said side wall regions; and

second fold lines at the junctions of said side wall regions and said flap regions at which said flap regions are folded so as to come together to form a closed cover facing and spaced from said central region, thereby forming a closed housing defining a tag body; and

a first magnetic element, said first magnetic element being disposed in said closed housing;

and receiving a magnetic signal resulting from the interaction of said first magnetic field and said EAS tag for detecting the presence of said EAS tag in said interrogation zone.

59. A method in accordance with claim 58 wherein:

said EAS tag further comprises;

a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to said first magnetic field;

and means for securing said second magnetic element to said tag body.

60. A method of operating an EAS system in accordance with claim 58 wherein:

said EAS tag further comprises;

a second magnetic element which when magnetized arms said first magnetic element to mechanically vibrate in response to said first magnetic field, said second magnetic element being disposed in said housing.

61. A method of operating an EAS system in accordance with claim 58 wherein:

said first magnetic element comprises a first magnetic part which when magnetized arms said first magnetic element to mechanically vibrate in response to said first magnetic field.

62. A method of operating an EAS system in accordance with claim 61 wherein:

said first magnetic part forms a surface portion of said first magnetic element.

63. A method of operating an EAS system in accordance with claim 58 wherein:

said first magnetic element mechanically vibrates in response to said first magnetic field.