Method of measuring coercive force of a magnetic card
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United States of America Patent
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-
Oct 28, 2003
Grant Date -
N/A
app pub date -
May 4, 2001
filing date -
Nov 19, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for judging coercive force of a magnetic card to judge coercive force of a magnetic card to be used. According to the method for judging coercive force of a magnetic card for reproducing or recording magnetic information formed on a low coercive force card or a high coercive force card inserted from a card slot by a magnetic head, after erasing data of an inserted card by an electric current capable of erasing data of only a low coercive force card (step S32), the data of the card is reproduced (step S33), the inserted card is judged as the low coercive force card (step S36) if the data has been destroyed (No at the step S34). Destruction of the data is judged based on the number of times of flux reversal of the reproduced data or by a fact that specific data (STX code) which should be recorded on a predetermined card is not recognized.
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