RADIO OPERATION DEVICE SUCH AS ELECTRIC SHUTTER AND TRANSMITTER

PROBLEM TO BE SOLVED: To reduce a possibility of the occurrence of erroneous operation by constituting a receiver which uses two conveyance media of radio wave and infrared ray in such a manner that the ascent and descent of a shutter curtain are controlled by using two logic products obtained from the conveyance media. SOLUTION: An electric shutter is provided with an opening and closing machine which winds a shutter curtain up or lowers it through a controller. A transmitter is constituted in such a manner that a common signal is generated by a conveyance medium 1 such as radio wave, each signal for ascent, descent, and stop is generated by a conveyance medium 2 such as infrared rays, and these signals are given to the controller through a receiver. When each button for ascent, descent, or stop operation of the transmitter is pressed, signals for ascent, descent, or stop instruction are given to the opening and closing machine through an AND circuit 11, an AND circuit 12, or an AND circuit 13, respectively, to raise, lower, or stop the shutter curtain. Consequently, it is possible to reduce a possibility of the occurrence of erroneous operation greatly.