| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a non-contact data carrier, a reader/writer apparatus and a non-contact data carrier system, capable of applying to a conventional non-contact data carrier system and securing stable communication. <P>SOLUTION: The reader/writer apparatus 2 detects a resonance frequency for a resonant circuit containing a loop coil 11 and a capacitance variable capacitor 12 at a non-contact data carrier 1. If the detected resonance frequency of the resonant circuit at the non-contact data carrier 1 is shifted compared to a reference resonance frequency, the reader/writer apparatus 2 sends out data for frequency adjustment to the non-contact data carrier 1. Then, the non-contact data carrier 1 performs frequency adjustment processing for the resonance frequency of the resonant circuit containing the loop coil 11 and the capacitance variable capacitor 12, based on the data for frequency adjustment. <P>COPYRIGHT: (C)2009,JPO&INPIT |
