CONTACTLESS IC CARD READER AND DATA READING METHOD
First Claim
1. A contactless IC card reader configured to transmit signals composed of amplitude modulated carrier signals to a contactless IC card, comprising:
- a contactless control means configured to modulate/demodulate signals transmitted to/received from the contactless IC card; and
a main control means which is electrically connected to the contactless control means and administers the control of the entire card reader;
wherein the contactless IC card reader is configured to communicate with the contactless IC card by means of an NRZ encoding method and by means of an ASK modulation method for which a modulation depth has an arbitrary value; and
wherein the modulation depth is varied by said contactless control means based on a command sent from said main control means, the modulation depth having multiple range widths with an arbitrary value as the standard.
1 Assignment
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Accused Products
Abstract
A contactless IC card reader and a data reading method which are capable of improving data reading accuracy while preventing a decrease in processing speed. Specifically, in a contactless IC card reader which transmits signals composed of amplitude modulated carrier signals to a contactless IC card, the contactless IC card and reader communicate by means of an NRZ encoding method and an ASK modulating method for which the modulation depth has an arbitrary value. The contactless IC card reader is provided with a contactless control means which modulates/demodulates signals transmitted to/received from the contactless IC card, and a main control means which is electrically connected to the contactless control means and that controls the entire card reader. The modulation depth that is varied by the contactless control means based on the command sent from the main control means has multiple range widths with an arbitral value as the standard.
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Citations
4 Claims
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1. A contactless IC card reader configured to transmit signals composed of amplitude modulated carrier signals to a contactless IC card, comprising:
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a contactless control means configured to modulate/demodulate signals transmitted to/received from the contactless IC card; and a main control means which is electrically connected to the contactless control means and administers the control of the entire card reader; wherein the contactless IC card reader is configured to communicate with the contactless IC card by means of an NRZ encoding method and by means of an ASK modulation method for which a modulation depth has an arbitrary value; and wherein the modulation depth is varied by said contactless control means based on a command sent from said main control means, the modulation depth having multiple range widths with an arbitrary value as the standard. - View Dependent Claims (2, 3)
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4. A data reading method of a contactless IC card reader which transmits signals composed of amplitude modulated carrier signals to a contactless IC card, said contactless IC card reader being provided with a contactless control means configured to modulate/demodulate signals transmitted to/received from said contactless IC card and a main control means which is electrically connected to said contactless control means and which administers the control of the entire card reader, wherein the method comprising:
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a step in which, when said contactless IC card and said contactless IC card reader cannot communicate, a command to change the register value having an arbitrary value for a modulation depth is sent from said main control means to said contactless control means; a step in which the modulation depth is varied using multiple range widths at said contactless control means; and a step in which, when the communication is enabled between said contactless IC card and said contactless IC card reader, the register value at that point is registered as an ideal value in the contactless control means; wherein said contactless IC card communicates with said contactless IC card reader by means of an NRZ encoding method and by means of an ASK modulation method for which the modulation depth has an arbitrary value.
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Specification