Patent
1994-06-29
1996-02-13
Gellner, Michael L.
354414, 354415, 354417, G03B 700
Patent
active
054915333
ABSTRACT:
An electronic flash control system and method for a high-speed repeating flash having a main capacitor which stores energy for flashing, a discharge element, a switching apparatus, a control unit and a photometric unit. The switching apparatus causes the discharge element to flash multiple times during the exposure operation of the camera based on a signal from the control unit generated in accordance with the duty ratio. The duty ratio for each flash is determined by the control unit based on a signal from the photometric unit representative of the quantity of light from the previous flash of the discharge element. As the control system does not perform real-time control, delays of the control system do not adversely affect accuracy.
REFERENCES:
patent: Re28025 (1968-04-01), Murata et al.
patent: 4049996 (1977-09-01), Vital et al.
patent: 4592639 (1986-06-01), Nakamura
patent: 4951081 (1990-08-01), Hosomizu et al.
patent: 5239336 (1993-08-01), Matsui et al.
Gellner Michael L.
Miller Matthew
Nikon Corporation
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