| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a door alarm device capable of preventing an occurrence of accident when a door closes. <P>SOLUTION: A door alarm device comprises: a potentiometer 12 that is installed at a revolving shaft of a door 1, generates voltage corresponding to a rotation angle and outputs it as an angle signal; alarm units 15 and 26 for outputting an alarm; and a control unit 24 that calculates an open angle of the door based on the angle signal from the potentiometer, calculates time until the door closes based on the calculated angle, and drives and orders the alarm units to output an alarm when the calculated time is shorter than predetermined determination time. <P>COPYRIGHT: (C)2012,JPO&INPIT |
