| 摘要 |
PURPOSE:To prevent the forgery of a card by communicating information through the use of the carriers of different frequencies between at least two pairs of card communication equipment and a ticket examination machine communication equipment. CONSTITUTION:A ticket examination machine main communication unit 2 and a ticket examination machine subcommunication unit 3 in a ticket examination machine 1 always generate feeble radio waves obtained by AM-modulating the carriers of peculiar frequencies which mutually differ from each other through a ticket examination machine main antenna 4 and a ticket examination machine subantenna 5. When a user prossessing a card 9 approaches the non-contact ticket examination system and the card 9 enters within the detecting range of the feeble radio waves, a card main antenna 12 and a card subantenna 13 respectively receive the feeble radio waves, and a card main communication unit 10 and a card subcommunication unit 11 respectively receive signals from the ticket examination machine main communication unit 2 and the ticket examination machine subcommunication unit 3. Information communicated between the ticket examination machine 1 and the card 9 is divided into two and they are communicated by using the carriers different in the frequencies. Thus, information for forgery cannot be obtained if only one carrier is detected. |
