Thermomagnetic encoding method and articles
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United States of America Patent
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Feb 20, 1996
Issued Date -
N/A
app pub date -
Oct 25, 1993
filing date -
Sep 28, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An article comprising first and second bodies of permanent magnet material, each of said first and second bodies consisting substantially of a substrate of permanent magnet material being magnetized substantially uniformly to a predetermined flux density in a range from zero flux to 100% flux saturation of the permanent magnet material; each of the first and second bodies also comprising a pattern of at least one affected volume in a surface of the body, wherein each affected volume has a magnetic flux density that varies from the substantially uniform predetermined flux density and wherein the first and second bodies are stacked and fixedly attached so that the pattern on each body aligns with the pattern on the other body, wherein at least one affected volume on the first body is aligned with at least one affected volume on the second body and wherein the aligned affected volumes comprise a pole detectable by a magnetic sensor.
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