| 摘要 |
<p>PURPOSE:To automatically guard the inside of a room and the inside of a building in which there is no one by checking the number of persons at the time of entering the room and entering the building, and the number of persons at the time of leaving the room and leaving the building by using a noncontact card by a pair of readers installed in the inside and the outside of an entering/leaving port. CONSTITUTION:A noncontact card for utilizing a radio wave or infrared rays is used, and as for sensors(code readers) 1-4 of the card, two pieces and installed in the inside and the outside with regard to one part of an entering/leaving door, and the sensors 1-4 always execute the code retrieval of the card by polling and judge entering and leaving of a registrant by two pieces of sensors in the inside and the outside of the door, and when a person existing in the room is '0', the automatic guard is executed, and by a first entering the room, the automatic release is executed. In such a way, according to this guarding method, the number of persons who enter the room or enter the building and the number persons who leave the room or leave the building are compared, and start and release operations of the guard are executed, and by checking surely a fact that a person existing in the room or a person existing in the building is zero, the guarding system can be operated.</p> |
