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Communication apparatus

  • US 20050064814A1
  • Filed: 07/12/2004
  • Published: 03/24/2005
  • Est. Priority Date: 07/22/2003
  • Status: Active Grant
First Claim
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1. A communication apparatus capable of data transmission by electromagnetic waves to an external apparatus and data transfer by load modulation with respect to electromagnetic waves transmitted from the external apparatus, the communication apparatus comprising:

  • an antenna;

    a receiving and demodulating unit for detecting current flowing in the antenna and for demodulating a reception signal received from the external apparatus;

    a modulating and transmitting unit for modulating a carrier in accordance with a transmission signal to be transmitted to the external apparatus and for transmitting the modulated carrier via the antenna;

    a transmission and reception control unit for controlling reception of the reception signal by the receiving and demodulating unit and transmission of the transmission signal by the modulating and transmitting unit;

    a storage unit for storing data; and

    an operation control unit for controlling an operation by a user, the operation control unit including a state setting part for selectively setting the communication apparatus to a transmission state and an acquisition state, wherein;

    when the state setting part sets the communication apparatus to the transmission state and the communication apparatus is capable of communicating with the external apparatus, the transmission and reception control unit transmits the data stored in the storage unit; and

    when the state setting part sets the communication apparatus to the acquisition state and the communication apparatus is capable of communicating with the external apparatus, the transmission and reception control unit acquires data transmitted from the external apparatus and stores the acquired data in the storage unit.

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