| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an obstacle detection system for a shutter capable of improving reliability of a harm prevention function of the shutter. <P>SOLUTION: An obstacle detection system 30 detects an obstacle to a shutter curtain which opens or closes an opening section. The obstacle detection system 30 comprises: a seat plate switch 31 which detects existence of the obstacle, at the opening section 1, interfering a closing performance of the shutter curtain 12; a transmitter 32 which transmits, by radio, an obstacle detection state signal including information indicating a detection state of the obstacle by the seat plate switch 31; and a receiver 33 which receives the obstacle detection state signal by radio. The transmitter 32 has a first transmission section which transmits the obstacle detection state signal with a predetermined first frequency range; and a first receiving section which receives a predetermined signal with a predetermined second frequency range different from the first frequency range. The receiver 33 has a second receiving section which receives the obstacle detection state signal with the first frequency range and a second transmission section which transmits the predetermined signal with the second frequency range. <P>COPYRIGHT: (C)2013,JPO&INPIT |
