| 摘要 |
<p>PURPOSE:To improve the response characteristic of a photometric circuit, by generating the power source voltage for the photometric circuit simultaneously with starting a switching element connected in series to a discharge tube. CONSTITUTION:When a synchro contact 6 is closed, a discharge tube 28 is triggerred, and the charge of a capacitor 16 is discharged through the contact 6, a resistance 22, and a resistance 18. Then, a thyristor 24 is turned on, and power is supplied from a main capacitor 2 to a photometric circuit, which is indicated by the broken line including a photo transistor 48, by this turning-on. Simultaneously, the discharge light emission is started. When a thyristor 42 is turned on by a prescribed receiving light integration, a thyristor 46 is turned on also, and the thyristor 24 is turned off by a reverse voltage which is generated in a resistance 30 by discharging of a capacitor 32 to stop the light emission.</p> |
