| 摘要 |
PROBLEM TO BE SOLVED: To actualize an efficient data communication making good use of the convenience of a noncontact type IC card. SOLUTION: A reader writer 30 receives a communication radio wave sent from the noncontact IC card 20 by both an entrance-side antenna 31a and an exit-side antenna 31b. The direction where the noncontact type IC card 20 is held up is detected from the difference in intensity between the communication radio waves received by the antennas 31a and 31b and only the transmit signal based upon the communication radio wave received by the antenna on the side where the noncontact type IC card 20 is held up is detected as receive data. Consequently, the efficient data communication can be actualized by making good use of the convenience of the noncontact type IC card 20. |
