Remotely readable data storage devices and apparatus
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United States of America Patent
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May 30, 1995
Grant Date -
N/A
app pub date -
Jun 15, 1993
filing date -
Jan 4, 1991
priority date (Note) -
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Abstract
A magnetostrictive element, which may be of rectangular shape, is positioned next to a hard magnetic biasing element field with patterns recorded therein which bias the magnetostrictive element to resonate at selected frequencies, particularly harmonics of the fundamental frequency, in response to an alternating interrogating magnetic field at the same frequencies. Data may thus be encoded by selecting the frequencies at which the element will resonate. In addition to resonance at different harmonics, resonance in different modes, particularly longitudinal, transverse or flexural modes may be produced. The device may be applied to article identity systems, such as security systems but also has many other applications.
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