| 摘要 |
<p>PURPOSE:To correct the difference in the quantity of light of a discharge flashgun by generating a flashing stop signal when a reference voltage generated by a resistance circuit including plural resistance members and the time adjusting voltage of a time constant circuit have prescribed relation. CONSTITUTION:Resistances 22 and 23, and 24-27 form plural resistance circuits for generating the reference voltage; and the resistances 24-27 have resistance values determined on specific condition and are connected selectively to the 2nd capacitor 19 by a changeover switch 28 operated according to the set value of the quantity of flashing. Resistances 29-32 are time constant resistances connected selectively to the 2nd capacitor 19 by a changeover switch 32 and form the time constant circuit together with a time constant capacitor 34. Then, a PUT35 forming a comparing circuit turns on when the time adjusting voltage of the time constant circuit becomes equal to the reference value of the resistance circuits to stop the flashing of a flash discharge tube 5. Consequently, the uniform quantity of flashing is obtained and the difference in the quantity of light of the discharge flashgun is corrected.</p> |
