| 摘要 |
PROBLEM TO BE SOLVED: To simplify the ID identification method in a reflected wave type ID identification system. SOLUTION: A transmission antenna 13 and a reception antenna 14 of this ID identification device 11 are installed apart from each other, and a holder of a reflected wave ID card C passes between the transmission antenna and the reception antenna. When radio waves having the frequency coinciding with the resonance frequency are transmitted in the case the reflected wave ID card exists, the reflected wave ID card reradiates the radio waves, and only the reception level of the frequency becomes a high level. The ID identification device detects the existence of the reflected wave ID card from the comparison result between a transmission level and a reception level, specifies the resonance frequency, and outputs the ID code correlated with the reflected wave ID card to a host computer. |
