| 摘要 |
PURPOSE:To reduce the number of handling signal lines and prevent malfunction by encoding operation signals in an apparatus which performs remote operation. CONSTITUTION:Signals for operation of 15 kinds of functions by operating the plural switches SW1-SW15 in an operation part generate encoded signals on four signal lines A-D by an encoder circuit 10. Each switch is of duplex type, of which the output line of one switch part (a) is used as the row line of a matrix circuit 10, and the output line of the other switch part (b) is applied in common to one input of differential amplifiers 11, 12 via a resistance. The divided voltages of a power source B are supplied as reference potentials to the other input of the differential amplifiers 11, 12. Since the voltage at the common output point X of the switch part (b) differs from the case in which only one switch SW turns on the case in which >=2 pieces thereof turn on, the reference potentials of the differential amplifiers 11, 12 are regulated, so that the output of an AND circuit 13 is generated and the outputs are transmitted through gates 14-17 only when one switch is turned on. |
