Security device and system
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Accused Products
Abstract
A security device (100) comprises at least one magnetic element (102). The magnetic element (102) is responsive to an applied magnetic field to provide a characteristic response. The characteristic response can be used to identify a particular security device (100) when interrogated by a security system, thereby aiding in prevention of copying of the security device (100).
365 Citations
128 Claims
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1-64. -64. (canceled)
- 65. A security device comprising at least one magnetic element, wherein said at least one magnetic element is responsive to an applied magnetic field to provide a characteristic response, wherein said at least one magnetic element is made from a material that comprises structural defects that cause brittle mode switching in which the growth of a single magnetic domain dominates the change in magnetisation of a respective magnetic element.
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84. A method of manufacturing a security device, comprising:
providing at least one magnetic element comprising structural defects, wherein said at least one magnetic element provides a brittle mode switching characteristic response in response to an applied magnetic field. - View Dependent Claims (85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95)
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97. A system for reading a security device, comprising:
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a magnetic field generation system for applying a magnetic field to a security device; and
a detection system for measuring one or more parameters representative of a brittle mode switching measured characteristic response of said security device in response to said magnetic field, wherein said system is operable to compare said one or more parameters representative of a brittle mode switching measured characteristic response to one or more respective parameters of a brittle mode switching premeasured characteristic response to determine whether respective measured and premeasured parameters are substantially equivalent. - View Dependent Claims (98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111)
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112. A method for reading a security device, comprising:
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applying a magnetic field to a security device;
measuring one or more parameters representative of a brittle mode switching measured characteristic response of said security device in response to said magnetic field; and
comparing said one or more parameters representative of a brittle mode switching measured characteristic response to one or more respective parameter(s) of a brittle mode switching premeasured characteristic response to determine whether respective measured and premeasured parameters are substantially equivalent. - View Dependent Claims (113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126)
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- 127. A product comprising a security device comprising at least one magnetic element, wherein said at least one magnetic element is responsive to an applied magnetic field to provide a characteristic response, wherein said at least one magnetic element is made from a material that comprises structural defects that cause brittle mode switching in which the growth of a single magnetic domain dominates the change in magnetisation of a respective magnetic element.
Specification