| 摘要 |
<p>PURPOSE:To prevent the deficiency of quantity of the light emitted in the stage of emitting light for photographing even if preliminary irradiation is performed by triggering light emitting tubes for photographing and preliminary irradiation to emit light by the charge accumulated in a common capacitor and outputting a signal showing the possibility of preliminary irradiation in addition to a signal showing the completion of charging. CONSTITUTION:The output from a comparator AC 2 goes to ''High'' when the potential at the juncture between resistors R2 and R3 exceeds the output potential of a constant voltage source VC. The voltage of a main capacitor C2 is eventually charged up to the voltage necessary for the quantity of the light to be emitted by a xenon tube XE2 attains the normal quantity of the light to be emitted in this case. The signal showing the completion of charging is fed to a camera body and the completion of charging is displayed by a display circuit CDP. When the potential at the juncture between the resistors R3 and R4 exceeds the output potential of the power source VC, the output from a comparator AC3 goes to ''High''. Said signal indicates that the capacitor C2 is charged up to the value necessary for the tube XE2 to emit light by as much as the nominal value and for a xenon tube XE1 for preliminary irradiation to emit twice by as much as prescribed quantity. Said signal is fed as the signal showing the possibility of preliminary irradiation to the camera side.</p> |
