| 摘要 |
PURPOSE:To make it possible for a number of persons to simultaneously enter or leave a room by a sheet of card and precisely grasp the situation of the number of entered, left, and existing persons for the sake of both convenience and guard and security. CONSTITUTION:The door 6 of a room 7 is usually locked by an electric lock 5. Lock controllers 1, 2 are provided at two positions of both inside and outside of the door 6 respectively and also receivers 3, 4 are equipped at two positions of both inside and outside of the room 7 respectively. The respective controllers 1, 2 correspond to one's entering and leaving. The lock 5 is opened if the recorded code of an inserted card coincides to a previously registered code when these are compared with each other. Respective receivers 3, 4 can receive electric waves relative to respective exclusive codes output from the transmitters 9A, 9B, 9C carried by a person inside the room 7 and a person outside the room. Respective transmitters or carriers can be specified by a computer, based on the received exclusive codes. |
