| 摘要 |
PURPOSE:To prevent the malfunction and the deterioration of signal transmitting function, by providing a bridge circuit comprising a diode and a light emitting element between input terminals of a signal transmission and reception section. CONSTITUTION:In applying a transmission signal to a transistor (TR) 107, a voltage is applied from a supply terminal 100 via a contact 114, a light emitting element 202, a photodetector 211, and a terminal 110. As a result, the transmission signal is induced since a photodetector 205 is coupled optically with the elements 202 and 203. Further, in receiving a signal from a signal transmission/reception section 2 at a signal transmission/reception section 1, switching of switches 109, 113 can do. The connection of transmission lines 3, 4 is possible for two ways as shown in the figure and the reversed connection not shown, allowing to prevent the deterioration of signal transmitting function. Since the sections 1, 2 are separatd electrically. the effect of noise caused between common potentials is eliminated. |
