| 摘要 |
<p>In an electronic flash apparatus, a flash preparation signal is sent from a signal generating means to a first switching device at a first timing preceding the flash emission, the first switching device is rendered conductive to start a resonant oscillation in a resonance circuit, thereby charging a trigger capacitor. If the flash preparation signal is terminated in the course of the resonance action, the first switching device is rendered non-conductive at a timing when the junction between the cathode of the flash discharge tube and the first switching device assumes a negative potential by the resonance action. Then, when a flash start signal is sent from the signal generating means to a second switching device at a second timing which is at least later than the above-mentioned timing, a trigger circuit is activated to supply the flash discharge tube with a trigger voltage, thereby starting the flash emission.</p> |
