| 摘要 |
PURPOSE:To simplify a firing device by transmitting start/stop signals for controlling the firing of an SCR in coded signal formats, discriminating the signal to control a pulse generator, thereby employing a system of a light signal transmitter. CONSTITUTION:Coded start signal and stop signal are supplied to a light emitting circuit 2a, and converted to light signals (a). The coded light signals (a) are transmitted through a light guide 3a to a photoreceptor 4a, which converts them into electric signals (b). The signals (b) are supplied to a monostable multivibrator 8. The multivibrator 8a is triggered by the fall of the signal (b) from the photoreceptor, the output signal (c) of which is supplied to the multivibrator 8b, which is triggered by the fall of the signal (c). Further, the output signal (d) of the multivibrator 8b and the output signal of the photoreceptor are supplied to an AND gate 9a, the output (e) of which is supplied to the set terminal of an FF5. |
