| 摘要 |
<p>A tag for use with an electromagnetic identification system includes a magnetic control component (1), having alternating regions (10, 20) of, respectively, high and medium coercivity material, and an element (30) of magnetically soft material. The element (30) may be polarised so as to deactivate the tag by, for example, selectively demagnetising the regions (20) of medium coercivity, such as by exposing the tag to an alternating magnetic field having an initial field strength which is intermediate between the coercivity of the regions (10, 20), which may be formed as a striped coating or from a number of discrete magnetic components. The tag may include a surface layer bearing information (60) so as, for example, to simulate a product label.</p> |
