| 摘要 |
<p>PURPOSE:To correct the difference in the quantity of light of a discharge flashgun, by comparing a reference voltage generated by a resistance circuit with the time adjusting voltage of a time constant circuit and generating a flashing stop signal when those voltages have prescribed relation. CONSTITUTION:Resistances 22-24 connected to the 2nd capacitor 19 in parallel form the resistance circuit for generating the reference voltage and have resistance values determined on specific condition. Resistances 25-28 are time constant resistance connected selectively to the 2nd capacitor 19 through a changeover switch 29 and form a time constant circuit together with a time constant resistance 30. Then, a PUT element 31 forming a comparing circuit turns on when the time adjusting voltage of the time constant circuit becomes equal to the reference voltage of the resistance circuit to send its conduction signal to the gate of the SCR10 of a flashing stopping circuit 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> |
