Rohm Co., Ltd.

Satoshi Yoshioka

Yoshihiro Ikefuji

Shigemi Chimura

Data communication means ( ) performs data communication and power transmission by utilizing electromagnetic waves. Conversion method designating means ( ) is provided with output value measuring means ( ) which measures the magnitude of the fluctuating output of a resonance circuit ( ), and conversion method select means ( ) which selects a conversion method to be executed in accordance with the obtained magnitude of the output of the resonance circuit ( ). Data converting means ( ) is provided with three conversion methods and performs conversion between original data and processed data by executing conversion in accordance with one of the conversion methods designated by the select means ( ). The safety on security can thus be improved with a simple constitution.

Data communication equipment, data communication system, and data communication method

In a non-contact IC card, a driving portion sequentially switches a resonance frequency of a resonance circuit . A reference voltage generating portion receives an output voltage of resonance circuit for outputting a prescribed reference voltage. An output value measuring portion measures a magnitude of the output voltage of resonance circuit at each resonance frequency using the reference voltage as a reference. An output value storing portion stores a measurement value (an output value). A manner determining portion selects the largest one of the output values stored in output value storing portion , and determines a switching manner corresponding thereto as a suitable switching manner. Thus, the suitable switching manner allowing the most efficient power supply can be achieved.

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Kyoto, Japan

Satoshi Yoshioka