Magnetic card reader and method for determining the coercive force of a magnetic card therein
First Claim
1. A method for determining the coercive force of a magnetic card in a magnetic card reader in which magnetic information formed on a card to be inserted from a card insertion slot is regenerated or recorded by a magnetic head comprising the steps of:
- first recording or erasing data onto or from a data track by said magnetic head at a given current; and
then determining the coercive force of said data track by the regeneration output of said data, in which after recording test data onto said data track at a current corresponding to a low coercive force card, said test data are regenerated such that said card is determined to be a low coercive force card if said regenerated data are identical to said test data.
1 Assignment
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Accused Products
Abstract
A magnetic card reader comprises a card insertion slot, a magnetic head for regenerating or recording magnetic information formed on a card to be inserted in the cart insertion slot and a determining device to determine coercive force of a data track for recording magnetic information of the card. A method for determining the coercive force of a magnetic card in a magnetic card reader in which magnetic information formed on a card to be inserted from a card insertion slot is regenerated or recorded by a magnetic head comprises the steps of providing a detecting portion which detects a change in static characteristics of the magnetic head and determining the coercive force of a data track by comparing output from the detecting portion, which detects a change in static characteristics of the magnetic head while being positioned across from the card, with a reference signal.
32 Citations
16 Claims
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1. A method for determining the coercive force of a magnetic card in a magnetic card reader in which magnetic information formed on a card to be inserted from a card insertion slot is regenerated or recorded by a magnetic head comprising the steps of:
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first recording or erasing data onto or from a data track by said magnetic head at a given current; and
then determining the coercive force of said data track by the regeneration output of said data, in which after recording test data onto said data track at a current corresponding to a low coercive force card, said test data are regenerated such that said card is determined to be a low coercive force card if said regenerated data are identical to said test data. - View Dependent Claims (12)
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2. A method for determining the coercive force of a magnetic card in a magnetic card reader in which magnetic information formed on a card to be inserted from a card insertion slot is regenerated or recorded by a magnetic head comprising the steps of:
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first recording or erasing data onto or from a data track by said magnetic head at a given current; and
then determining the coercive force of said data track by the regeneration output of said data, in which after recording test data onto said data track at a current corresponding to a high coercive force card, said test data are regenerated such that said card is determined to be a high coercive force card if said regenerated output is higher than a given value. - View Dependent Claims (13)
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3. A method for determining the coercive force of a magnetic card in a magnetic card reader in which magnetic information formed on a card to be inserted from a card insertion slot is regenerated or recorded by a magnetic head comprising the steps of:
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first recording or erasing data onto or from a data track by said magnetic head at a given current; and
then determining the coercive force of said data track by the regeneration output of said data, in which after erasing data recorded on said data track, test data are recorded on said data track at a current corresponding to a low coercive force card such that said card is determined to be a low coercive force card if regenerated output is higher than a given value. - View Dependent Claims (14)
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4. A method for determining the coercive force of a magnetic card in a magnetic card reader in which magnetic information formed on a card to be inserted from a card insertion slot is regenerated or recorded by a magnetic head comprising the steps of:
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first recording or erasing data onto or from a data track by said magnetic head at a given current; and
then determining the coercive force of said data track by the regeneration output of said data, in which recorded data recorded on said data track are erased at a current, at which only data on a low coercive force card are erasable, such that said card is determined to be a high coercive force card if regenerated output on said data track is higher than a given value. - View Dependent Claims (15)
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5. A magnetic card reader comprising:
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a card insertion slot;
a magnetic head for regenerating or recording magnetic information formed on a card to be inserted in said card insertion slot; and
a determining means to determine coercive force of a data track for recording magnetic information of said card, in which said determining means comprises a detecting portion which detects a change in static characteristics of said magnetic head when said magnetic head is positioned across from said card. - View Dependent Claims (6, 7, 8, 16)
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9. A method for determining the coercive force of a magnetic card in a magnetic card reader in which magnetic information formed on a card to be inserted from a card insertion slot is regenerated or recorded by a magnetic head comprising the steps of:
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providing a detecting portion which detects a change in static characteristics of said magnetic head; and
determining the coercive force of a data track by comparing output from said detecting portion, which detects a change in static characteristics of said magnetic head while being positioned across from said card, with a reference signal. - View Dependent Claims (10, 11)
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Specification