Non-contact type IC card
First Claim
1. A non-contact type IC card that communicates signals with an external device in a non-contact manner, comprising:
- main circuit means for conducting various operations based on functions of said non-contact type IC card;
operation inhibition signal generating means for creating an operation inhibition signal to inhibit an operation of said main circuit means for a predetermined period of time; and
control means for controlling said main circuit means and said operation inhibition signal generating means,wherein said control means operates said operation inhibition signal generating means when said operation of said main circuit means is finished and inhibits said operation of said main circuit means for a predetermined period of time according to said operation inhibition signal from said operation inhibition signal generating means.
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Accused Products
Abstract
In a non-contact type IC card, a re-access inhibition time setting circuit 12 sets a re-access inhibition period of time for inhibiting the re-access for a fixed period of time after an operation of a main circuit 16 is finished. This prevents a double write operation of history in the card due to the re-access in a short period of time. Moreover, two areas 321 and 322 are disposed in a memory 32 to write data alternately in these areas. In a read operation, when data of one of the areas is destroyed, the normal data in the other area is read; whereas, when each data is normal, the data last recorded is read. Consequently, the disabled state of the read operation due to wrong data can be prevented.
65 Citations
21 Claims
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1. A non-contact type IC card that communicates signals with an external device in a non-contact manner, comprising:
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main circuit means for conducting various operations based on functions of said non-contact type IC card; operation inhibition signal generating means for creating an operation inhibition signal to inhibit an operation of said main circuit means for a predetermined period of time; and control means for controlling said main circuit means and said operation inhibition signal generating means, wherein said control means operates said operation inhibition signal generating means when said operation of said main circuit means is finished and inhibits said operation of said main circuit means for a predetermined period of time according to said operation inhibition signal from said operation inhibition signal generating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-contact IC card, comprising:
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means for communicating signals with an external device in a non-contact manner; a memory for storing data sent from said external device; and means for controlling operations of said communicating means and said memory, wherein said control means comprises means for reading, when data is to be read from said memory, data from one of a plurality of areas in which data is normally stored, and means for inhibiting an operation of said non-contact IC card for a predetermined period of time upon an occurrence of a predetermined event. - View Dependent Claims (11, 12, 13)
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14. A non-contact type IC card, comprising:
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means for communicating signals with an external device in a non-contact manner; a memory for storing data sent from said external device; first control means for controlling operations of said communicating means and said memory; operation inhibition signal generating means for generating an operation inhibition signal for inhibiting said operations of said communicating means, said memory, and said first control means; and second control means for controlling said operation inhibition signal generating means, wherein said memory has an area subdivided into a plurality of areas for storing therein data sent from said external device; said first control means reads, when data is to be read from said memory, said data from one of said plurality of areas in which data is normally stored; and said second control means operates said operation inhibition signal generating means when said operations of said communicating means, said memory, and said first control means are finished and inhibits for a predetermined period of time said operations of said communicating means, said memory, and said first control means according to said operation inhibition signal from said operation inhibition signal generating means.
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15. A data storage device that prevents the exchange of erroneous data with an external device, comprising:
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a memory for storing data; means for exchanging data between said memory and said external device in a non-contact manner; and means for inhibiting an operation of said memory and said data exchanging means for a predetermined period of time after said data storage device completes an exchange of data with said external device. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification