Patent ID: 7181241
Filing Date: 2007-02-20
Classification: G06K

Abstract:
1. A memory card that includes storage means for storing data, operable to be mounted in an electronic device to transfer the data between the electronic device and the storage means, and capable of transmitting the data to a data reader, the memory card comprising: an antenna; an antenna switch that turns on/off to change a load impedance for the antenna; read means for reading data stored in the storage means; and wireless communication means that causes the read means to read the data in compliance with a data transmission request from the data reader, changes the load impedance for the antenna by exercising on/off control over the antenna switch in accordance with a bit string of the data read by the read means, generates a reflected wave by modulating an unmodulated carrier which is transmitted to the antenna from the outside, and uses the generated reflected wave to transmit the data to the data reader wired communication means that transfers data between the electronic device and the storage means, wherein the wireless communication means is prohibited from transmitting the data while the data is transferred by the wired communication means; and wherein the wired communication means is prohibited from transferring the data while the wireless communication means transmits the data.