Flash control based on calculated required flash energy

Details Flash control based on calculated required flash energy Flash control based on calculated required flash energy

1991-01-22

1992-09-15

Perkey, W. B.

354418, G03B 1505

Patent

active

051482126

ABSTRACT:
A flashing apparatus of an automatic light-adjusting type for illuminating a photographed object by discharging a charge charged to a main capacitor from a light emitting tube has an energy amount detector for detecting an energy amount applied to the light emitting tube from the main capacitor; an energy amount setting device for setting an amount of discharged energy of the main capacitor corresponding to a quantity of light required to illuminate the photographed object; a comparator for comparing the energy amount detected by the energy amount detector with the energy amount set by the energy amount setting device; and a light emission stopping device for stopping light emission of the light emitting tube by a signal outputted from the comparator when the comparator detects that the discharged energy amount of the main capacitor is in conformity with the set amount of the energy amount setting device after the light emission is started. The flashing apparatus may further has a voltage detector constituting the energy amount detector and detecting a voltage applied to the light emitting tube from the main capacitor; an electric current detector for detecting an electric current flowing through the light emitting tube; a multiplying device for multiplying the detected voltage by the detected electric current; an integrator for integrating the multiplied results; etc.

REFERENCES:
patent: 3868701 (1975-02-01), Kawasaki
patent: 4199242 (1980-04-01), Hosimizu et al.
patent: 4266163 (1981-05-01), Lloyd
patent: 4275335 (1981-06-01), Ishida
patent: 4336481 (1982-06-01), Numata
patent: 4416524 (1983-11-01), Takayama
patent: 4470684 (1984-09-01), Harvey
patent: 4486086 (1984-12-01), Kresock
patent: 4494850 (1985-01-01), Katsuma et al.
patent: 4523830 (1985-06-01), Jida et al.
patent: 4985725 (1991-01-01), Serikawa

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