Electronic flash apparatus

Details Electronic flash apparatus Electronic flash apparatus

1983-11-23

1984-12-04

Adams, Russell E.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

354416, 354418, 315241P, G03B 1503, G03B 1505

Patent

active

044860862

ABSTRACT:
Electronic flash apparatus produces a variable amount of flash illumination corresponding to pre-flash photographic conditions, i.e. subject distance, film speed, ambient light intensity, etc. Circuitry, which has a threshold adjustable in response to a pre-flash signal relating to the flash illumination required for the photographic conditions, monitors energy as it is delivered to a flash tube to produce flash illumination, for activating quenching circuitry to limit the discharging of a flash capacitor to an amount of energy corresponding to the pre-flash signal.

REFERENCES:
patent: 2901671 (1959-08-01), Most
patent: 3296947 (1967-01-01), Engelsmann et al.
patent: 3682056 (1972-08-01), Tokutomi
patent: 3976913 (1976-08-01), Mashimo

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