| 摘要 |
<P>PROBLEM TO BE SOLVED: To facilitate adjustment and readjustment of a resonance circuit in a non-contact IC card. <P>SOLUTION: A non-contact IC card incorporates a plurality of capacitors 4a, 4b and 4c which can be connected to an antenna 2 in parallel, a plurality of switches 5a, 5b and 5c for connecting them to the antenna 2 and a switch changeover circuit 7 for setting the connecting status of the capacitors 4a, 4b and 4c to the antenna 2. A reader/writer device 20 is provided with a voltage measuring circuit 24 for measuring a voltage value to be induced by an electric wave from a non-contact IC card. Then, an instruction to control the switching status of the switches 5a, 5b and 5c is inputted from an input device 9 to the switch changeover circuit 7 so that the voltage value measured by the voltage measuring circuit 24 can be a predetermined value. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
