A data communication system includes an external unit, such as a card reader/writer, with the ability of reading and writing data for a recording medium. The recording medium, such as an IC card, transacts signals with the external unit by being coupled electromagnetically in non-contact fashion wit
A data communication system includes an external unit, such as a card reader/writer, with the ability of reading and writing data for a recording medium. The recording medium, such as an IC card, transacts signals with the external unit by being coupled electromagnetically in non-contact fashion with the external unit and is supplied power from the external unit. The external unit includes a first data processor, a first electromagnetic transducing coil for the electromagnetic coupling with the medium, a carrier wave generator connected to the first coil for generating a carrier for transmitting a signal to the recording medium, and a received signal discriminator. The recording medium includes a second data processor, a second electromagnetic transducing coil for the electromagnetic coupling with the external unit, a switching circuit connected to the second coil for varying the load impedance of the second coil in response to a signal to be sent to the first coil, and a received signal detecting circuit. The data signal from the recording medium is demodulated for the carrier frequency from the external unit in response to the data signal, and transmitted to the external unit. The recording medium includes circuits which detect a variation in the power voltage supplied through the electromagnetic coupling and feed it back electromagnetically to the external unit.
대표청구항▼
A non-contact, electromagnetically coupled communication system comprising: a first communicating unit and a second communicating unit coupled electromagnetically in non-contact fashion for communicating signals therebetween, said first communicating unit comprising, first electromagnetic transducin
A non-contact, electromagnetically coupled communication system comprising: a first communicating unit and a second communicating unit coupled electromagnetically in non-contact fashion for communicating signals therebetween, said first communicating unit comprising, first electromagnetic transducing means having a single bi-directional transceiving coil for establishing electromagnetic coupling with said second communicating unit for subsequent signal communication; and carrier wave generating means, connected to said first electromagnetic transducing means, for generating a tone burst signal, including a carrier wave signal of a constant frequency, for data transmission to said second communicating unit, said second communicating unit comprising, second electromagnetic transducing means having a single bi-directional transceiving coil for establishing electromagnetic coupling with said first electromagnetic transducing means, for receiving said tone burst signal and for transmitting a data signal, and switching means connected to said second electromagnetic transducing means, for varying the impedance of said second electromagnetic transducing means, when activated in accordance with transmission of a data signal to said first communicating unit from said second communicating unit, said second electromagnetic transducing means modulating the frequency of said previously constant frequency carrier wave signal, upon said impedance being varied, to transmit the data signal, said first communicating unit further including detection means, responsive to operation of said switching means, for detecting reception of said data signal by detecting the modulation in the frequency of said previously constant frequency carrier wave, caused by variation of the impedance of said second electromagnetic transducing means.
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