Article security element
First Claim
1. An anti-theft device for use in a magnetic surveillance system for protecting an article from being stolen, the surveillance system including a transmitter for emitting magnetic energy along a detection axis and a receiver for detecting the energy, said anti-theft device comprising:
- a base body, said base body having a longitudinal axis;
said base body comprising a non-magnetic material;
a perimeter surface disposed outward of and at least partially surrounding said longitudinal axis of said base body;
at least one strip of soft magnetic material disposed on said perimeter surface of said base body;
said at least one strip of soft magnetic material being disposed in a spiral on said perimeter surface transverse to said longitudinal axis at an angle of pitch of between about 30° and
about 60°
with respect to said longitudinal axis; and
means for permitting fastening of said anti-theft device to the article to protect the article from being stolen.
1 Assignment
0 Petitions
Accused Products
Abstract
An article security element is provided which, regardless of its orientation in relation to a scanning field irradiated by a transmitter coil, can generate a response field which can be reliably detected by a receiver coil. The article security element preferably has a soft magnetic metal strip which is wound about an oblong, column-shaped base body at a winding angle which has a value between about 30 degrees and about 60 degrees with respect to the longitudinal axis of the base body.
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Citations
20 Claims
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1. An anti-theft device for use in a magnetic surveillance system for protecting an article from being stolen, the surveillance system including a transmitter for emitting magnetic energy along a detection axis and a receiver for detecting the energy, said anti-theft device comprising:
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a base body, said base body having a longitudinal axis; said base body comprising a non-magnetic material; a perimeter surface disposed outward of and at least partially surrounding said longitudinal axis of said base body; at least one strip of soft magnetic material disposed on said perimeter surface of said base body; said at least one strip of soft magnetic material being disposed in a spiral on said perimeter surface transverse to said longitudinal axis at an angle of pitch of between about 30° and
about 60°
with respect to said longitudinal axis; andmeans for permitting fastening of said anti-theft device to the article to protect the article from being stolen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An anti-theft device for use in a surveillance system for protecting an article from being stolen, the surveillance system including a transmitter for emitting energy and a receiver for detecting the energy, said anti-theft device comprising:
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a base body having a longitudinal axis; a perimeter surface disposed outward of and at least partially surrounding said longitudinal axis of said base body; said base body comprising a non-magnetic material; at least one strip of soft magnetic material disposed on said perimeter surface of said base body; said at least one strip of soft magnetic material being disposed in a spiral on said perimeter surface transverse to said longitudinal axis; and means for permitting fastening of said anti-theft device to the article to protect the article from being stolen. - View Dependent Claims (12, 13, 14, 15)
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16. A method for protecting an article from being stolen, said method comprising the steps of:
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providing means for detecting a magnetic field, said means for detecting a magnetic field being configured to detect a magnetic field in an area through which the article can be taken; disposing an anti-theft device to accompany an article to be protected upon movement of the article; configuring said anti-theft device to comprise; a base body having a longitudinal axis; a perimeter surface disposed outward of and at least partially surrounding said longitudinal axis of said base body; said base body comprising a non-magnetic material; at least one strip of soft magnetic material disposed on said perimeter surface of said base body; said at least one strip of soft magnetic material being disposed in a spiral on said perimeter surface transverse to said longitudinal axis; and means for permitting fastening of said anti-theft device to the article to protect the article from being stolen. - View Dependent Claims (17, 18, 19, 20)
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Specification