| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve a problem wherein the (n+1) pieces of connection wires are required when the number of switches is n, in constitution for connecting the connection wires to the respective switches, and wherein a wiring cost increases thereby, and then to allow the connection by two wires even when the number of the switches is increased. <P>SOLUTION: In this remote control switch with a display provided with: a switch part with the display having a series connection circuit connected in series with a plurality of first circuit blocks to each of which the switch is connected in parallel to a series circuit comprising an LED element and a resistor; a constant current source for making a fixed current flow in the switch part with the display; and a detecting part for determining an opened and closed condition of the switch by detecting a voltage drop in the switch part with the display, a resistance value in each of the resistors is selected to bring a fluctuation width in a circuit block both-end voltage due to a switch condition inside the corresponding circuit block into a voltage provided by multiplying a prescribed voltage with n-th power of 2. <P>COPYRIGHT: (C)2004,JPO</p> |
