| 摘要 |
A control circuit controls the amount of light emitted from an electronic flash tube in accordance with the voltage of a main capacitor, which energizes the flash tube, and a set guide number so that the amount of light may be constant irrespective of changes in the voltage of the main capacitor due to consumption of a power source battery from which electric energy is supplied to the main capacitor. The control circuit may include a storing or memorizing capacitor for storing a signal corresponding to the voltage of the main capacitor and further include a transistor which generates a current commensurate with the stored signal, the current being integrated to actuate a flash emission stopping circuit when the integration reaches a given level.
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