| 摘要 |
PURPOSE:To inexpensively obtain a projecting output with good accuracy by supplying two pulses generated at the times of the leading edge and trailing edge of the pulse to a D-type flip-flop circuit. CONSTITUTION:A signal A' generated in the form of a one-shot signal only at the times of leading edge and trailing edge of a necessary pulse signal is insulated by a photocoupler 3, thereafter, it is frequency-divided by a D-type flip-flop 10, the pulse signal of a duty ratio proportionate to a former analog voltage to be needed is generated, and it is integrated through an amplifier 11 by an integrating circuit 6. An integrated output D is smoothed by a smoothing circuit 7, an analog voltage signal E corresponding to a projecting intensity is generated, a driving circuit 8 is controlled, and a laser diode 9 is driven. Even when a time delay is generated at the time of turning on/off the photocoupler 3, the projecting output to be always stable and with good accuracy can be obtained without being influenced by the duty ratio of the pulse signal proportionate to the analog voltage signal E. |
