| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent an unnecessary alarm from being given even when detecting a person entering a room by an electric wave and giving an alarm, in an alarm device and an alarm method for detecting the person entering the room and giving the alarm. <P>SOLUTION: This alarm device 15 emits an entry-detecting electric wave 7 to the room to be detected through an antenna 5, and receives a change of a reflection state of the entry-detecting electric wave 7 through an antenna 6 to detect that the person enters the room 1. When it is detected that the entry of the person is detected, the alarm device 15 changes over the entry-detecting electric wave 7 to an RFID (Radio Frequency IDentification) tag-detecting electric wave, transmits it, detects an RFID tag 9 held by the person when the person is an authorized person 10, and operates an alarm part 26 by a control part 16 when it is decided that the person is not authorized. <P>COPYRIGHT: (C)2010,JPO&INPIT |
