| 摘要 |
<p>PURPOSE:To realize a secrecy protection system with simple constitution by providing a display device, which has a discrimination-card reading function, with a function of checking the extraction of a card, and by displaying and erasing display information in accordance with the insertion and extraction of the discrimination card. CONSTITUTION:When an operator inserts a magnetic card into a magnetic-card reader 1, an insertion detecting circuit 5 detects that to input a detection signal to an FF8, which inputs an interruption signal to an electronic computer 4. Necessary information entered into the magnetic card is read by a reading circuit 6 and inputted to the computer 4. Then, the computer 4 displays the interruption signal and the information of the magnetic card on a character display device 2. As the operator acquires the information and extracts the magnetic card, an extraction detecting circuit 7 operates to send a signal to the FF8, which stops the interruption signal, thereby informing the computer 4 of the completion of the information acquisition. Consequently, the computer 4 stops the information display one the device 2.</p> |
