| 摘要 |
<p>PURPOSE:To shorten the transmitting time from the card and to make the incorporated battery have a long life by transmitting the personal information in the personal card with the second frequency confirming that the radio wave does not exist from other card after the reminding radio wave is received with the first frequency. CONSTITUTION:When the person having a radio card 31 approaches a reminding radio wave transmitting antenna 13, a radio reception part 33 receives the reminding radio wave via a receiving antenna 32 within the card. And in a content designation command analysis part 34, the content designation command included in the reminding radio wave is analyzed and the information to be returned is selected. Then, whether the radio wave from other card exists or not in the transmitting frequency in the card is monitored for a fixed time to confirm the presence or absence of other card within a communicability area. When the radio wave does not exist, the information is received in a memory content reading part 35 from the content designation command analysis part 34, the information in the designation command area is read from a memory 38 within the card and is transmitted from a transmitting antenna within the card 37.</p> |
