SYSTEME DE COMMANDE D'UN APPAREIL A ECLAIRS ELECTRONIQUE

摘要

An electronic flash apparatus including a flash tube for producing light illuminating an object to be photographed by discharge of stored voltage charge in a storage capacitor; and a light responsive integrating circuit adapted to receive light reflected from the object for generating a discharge terminating signal when a quantity of received light reaches a predetermined value, and a switching element or a quench tube for terminating the discharge across the flash tube in response to the discharge terminating signal. A delay circuit is provided for causing the light responsive integrating circuit to be ready to receive the light reflected from the object prior to the production of light by the flash tube in order to measure the light with accuracy from the instant of the production of light.