| 摘要 |
A control system for flash illumination of a camera which operates with preparatory and main flash illumination. The camera has an internal photosensitive element which receives only the light created during the preparatory flash illumination and converts this light into a corresponding electrical quantity. A suitable preparatory electrical circuit receives this latter electrical quantity and converts it into a corresponding current. A flash terminating control is provided for automatically terminating the main flash operation, and between this latter control and the preparatory electrical circuit there is a main electrical circuit which receives one input in the form of the current provided by the preparatory electrical circuit, so as to utilize this one input to determine when to actuate the flash terminating control. A simulating electrical circuit is electrically connected with the main electrical circuit to provide a signal simulating that which would be provided if the main flash illumination were received by the internal photosensitive element, and by way of this simulated signal it is possible to provide a second input to be combined together with the above first input to provide a proper determination of the instant when the main flash will be terminated.
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