| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide non-contact IC card communication equipment for setting the tuning frequency of an antenna as the optimal frequency regardless of the installation environment. <P>SOLUTION: In a frequency correction mode, a control circuit 3 detects the power value of a transmission power by a transmission power detecting circuit 8 while changing the tuning frequency of an antenna 1 only by a preliminarily set value by controlling a frequency adjusting circuit 9, and adjusts the tuning frequency by changing the tuning frequency of the antenna 1 until the power value of a transmission power does not raise by a preliminarily set specific value or more before and after the tuning frequency is changed. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
